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| -rw-r--r-- | gcc/dwarfout.c | 4511 |
1 files changed, 4511 insertions, 0 deletions
diff --git a/gcc/dwarfout.c b/gcc/dwarfout.c new file mode 100644 index 00000000000..f055b615d32 --- /dev/null +++ b/gcc/dwarfout.c @@ -0,0 +1,4511 @@ +/* This file contains code written by Ron Guilmette (rfg@ncd.com) for + Network Computing Devices, August, September, October, November 1990. + + Output Dwarf format symbol table information from the GNU C compiler. + Copyright (C) 1992 Free Software Foundation, Inc. + +This file is part of GNU CC. + +GNU CC is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU CC is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU CC; see the file COPYING. If not, write to +the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ + +#include "config.h" + +#ifdef DWARF_DEBUGGING_INFO +#include <stdio.h> +#include "dwarf.h" +#include "tree.h" +#include "flags.h" +#include "rtl.h" +#include "insn-config.h" +#include "reload.h" +#include "output.h" + +/* #define NDEBUG 1 */ +#include <assert.h> + +#if defined(DWARF_TIMESTAMPS) +#if defined(POSIX) +#include <time.h> +#else /* !defined(POSIX) */ +#include <sys/types.h> +#if defined(__STDC__) +extern time_t time (time_t *); +#else /* !defined(__STDC__) */ +extern time_t time (); +#endif /* !defined(__STDC__) */ +#endif /* !defined(POSIX) */ +#endif /* defined(DWARF_TIMESTAMPS) */ + +#if defined(USG) || defined(POSIX) +#include <string.h> +#else +#include <strings.h> +#define strrchr rindex +#define getcwd(s,len) getwd(s) +#endif + +/* IMPORTANT NOTE: Please see the file README.DWARF for important details + regarding the GNU implementation of Dwarf. */ + +/* NOTE: In the comments in this file, many references are made to + so called "Debugging Information Entries". For the sake of brevity, + this term is abbreviated to `DIE' throughout the remainder of this + file. */ + +/* Note that the implementation of C++ support herein is (as yet) unfinished. + If you want to try to complete it, more power to you. */ + +#if defined(__GNUC__) && (NDEBUG == 1) +#define inline static inline +#else +#define inline static +#endif + +/* How to start an assembler comment. */ +#ifndef ASM_COMMENT_START +#define ASM_COMMENT_START ";#" +#endif + +/* Define a macro which, when given a pointer to some BLOCK node, returns + a pointer to the FUNCTION_DECL node from which the given BLOCK node + was instantiated (as an inline expansion). This macro needs to be + defined properly in tree.h, however for the moment, we just fake it. */ + +#define BLOCK_INLINE_FUNCTION(block) 0 + +/* Define a macro which returns non-zero for any tagged type which is + used (directly or indirectly) in the specification of either some + function's return type or some formal parameter of some function. + We use this macro when we are operating in "terse" mode to help us + know what tagged types have to be represented in Dwarf (even in + terse mode) and which ones don't. + + A flag bit with this meaning really should be a part of the normal + GCC ..._TYPE nodes, but at the moment, there is no such bit defined + for these nodes. For now, we have to just fake it. It it safe for + us to simply return zero for all complete tagged types (which will + get forced out anyway if they were used in the specification of some + formal or return type) and non-zero for all incomplete tagged types. +*/ + +#define TYPE_USED_FOR_FUNCTION(tagged_type) (TYPE_SIZE (tagged_type) == 0) + +#define BITFIELD_OFFSET_BITS(DECL) \ + ((unsigned) TREE_INT_CST_LOW (DECL_FIELD_BITPOS (DECL))) +#define BITFIELD_OFFSET_UNITS(DECL) \ + (BITFIELD_OFFSET_BITS(DECL) / (unsigned) BITS_PER_UNIT) +#define BITFIELD_OFFSET_WORDS_IN_UNITS(DECL) \ + ((BITFIELD_OFFSET_BITS(DECL) / (unsigned) BITS_PER_WORD) * UNITS_PER_WORD) + +extern int flag_traditional; +extern char *version_string; +extern char *language_string; + +/* Maximum size (in bytes) of an artificially generated label. */ + +#define MAX_ARTIFICIAL_LABEL_BYTES 30 + +/* Make sure we know the sizes of the various types dwarf can describe. + These are only defaults. If the sizes are different for your target, + you should override these values by defining the appropriate symbols + in your tm.h file. */ + +#ifndef CHAR_TYPE_SIZE +#define CHAR_TYPE_SIZE BITS_PER_UNIT +#endif + +#ifndef SHORT_TYPE_SIZE +#define SHORT_TYPE_SIZE (BITS_PER_UNIT * 2) +#endif + +#ifndef INT_TYPE_SIZE +#define INT_TYPE_SIZE BITS_PER_WORD +#endif + +#ifndef LONG_TYPE_SIZE +#define LONG_TYPE_SIZE BITS_PER_WORD +#endif + +#ifndef LONG_LONG_TYPE_SIZE +#define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2) +#endif + +#ifndef WCHAR_TYPE_SIZE +#define WCHAR_TYPE_SIZE INT_TYPE_SIZE +#endif + +#ifndef WCHAR_UNSIGNED +#define WCHAR_UNSIGNED 0 +#endif + +#ifndef FLOAT_TYPE_SIZE +#define FLOAT_TYPE_SIZE BITS_PER_WORD +#endif + +#ifndef DOUBLE_TYPE_SIZE +#define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2) +#endif + +#ifndef LONG_DOUBLE_TYPE_SIZE +#define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2) +#endif + +/* Structure to keep track of source filenames. */ + +struct filename_entry { + unsigned number; + char * name; +}; + +typedef struct filename_entry filename_entry; + +/* Pointer to an array of elements, each one having the structure above. */ + +static filename_entry *filename_table; + +/* Total number of entries in the table (i.e. array) pointed to by + `filename_table'. This is the *total* and includes both used and + unused slots. */ + +static unsigned ft_entries_allocated; + +/* Number of entries in the filename_table which are actually in use. */ + +static unsigned ft_entries; + +/* Size (in elements) of increments by which we may expand the filename + table. Actually, a single hunk of space of this size should be enough + for most typical programs. */ + +#define FT_ENTRIES_INCREMENT 64 + +/* Local pointer to the name of the main input file. Initialized in + dwarfout_init. */ + +static char *primary_filename; + +/* Pointer to the most recent filename for which we produced some line info. */ + +static char *last_filename; + +/* For Dwarf output, we must assign lexical-blocks id numbers + in the order in which their beginnings are encountered. + We output Dwarf debugging info that refers to the beginnings + and ends of the ranges of code for each lexical block with + assembler labels ..Bn and ..Bn.e, where n is the block number. + The labels themselves are generated in final.c, which assigns + numbers to the blocks in the same way. */ + +static unsigned next_block_number = 2; + +/* Counter to generate unique names for DIEs. */ + +static unsigned next_unused_dienum = 1; + +/* Number of the DIE which is currently being generated. */ + +static unsigned current_dienum; + +/* Number to use for the special "pubname" label on the next DIE which + represents a function or data object defined in this compilation + unit which has "extern" linkage. */ + +static next_pubname_number = 0; + +#define NEXT_DIE_NUM pending_sibling_stack[pending_siblings-1] + +/* Pointer to a dynamically allocated list of pre-reserved and still + pending sibling DIE numbers. Note that this list will grow as needed. */ + +static unsigned *pending_sibling_stack; + +/* Counter to keep track of the number of pre-reserved and still pending + sibling DIE numbers. */ + +static unsigned pending_siblings; + +/* The currently allocated size of the above list (expressed in number of + list elements). */ + +static unsigned pending_siblings_allocated; + +/* Size (in elements) of increments by which we may expand the pending + sibling stack. Actually, a single hunk of space of this size should + be enough for most typical programs. */ + +#define PENDING_SIBLINGS_INCREMENT 64 + +/* Non-zero if we are performing our file-scope finalization pass and if + we should force out Dwarf decsriptions of any and all file-scope + tagged types which are still incomplete types. */ + +static int finalizing = 0; + +/* A pointer to the base of a list of pending types which we haven't + generated DIEs for yet, but which we will have to come back to + later on. */ + +static tree *pending_types_list; + +/* Number of elements currently allocated for the pending_types_list. */ + +static unsigned pending_types_allocated; + +/* Number of elements of pending_types_list currently in use. */ + +static unsigned pending_types; + +/* Size (in elements) of increments by which we may expand the pending + types list. Actually, a single hunk of space of this size should + be enough for most typical programs. */ + +#define PENDING_TYPES_INCREMENT 64 + +/* Pointer to an artifical RECORD_TYPE which we create in dwarfout_init. + This is used in a hack to help us get the DIEs describing types of + formal parameters to come *after* all of the DIEs describing the formal + parameters themselves. That's necessary in order to be compatible + with what the brain-dammaged svr4 SDB debugger requires. */ + +static tree fake_containing_scope; + +/* The number of the current function definition that we are generating + debugging information for. These numbers range from 1 up to the maximum + number of function definitions contained within the current compilation + unit. These numbers are used to create unique labels for various things + contained within various function definitions. */ + +static unsigned current_funcdef_number = 1; + +/* Forward declarations for functions defined in this file. */ + +static void output_type (); +static void type_attribute (); +static void output_decls_for_scope (); +static void output_decl (); +static unsigned lookup_filename (); + +/* Definitions of defaults for assembler-dependent names of various + pseudo-ops and section names. + + Theses may be overridden in your tm.h file (if necessary) for your + particular assembler. The default values provided here correspond to + what is expected by "standard" AT&T System V.4 assemblers. */ + +#ifndef FILE_ASM_OP +#define FILE_ASM_OP "\t.file" +#endif +#ifndef VERSION_ASM_OP +#define VERSION_ASM_OP "\t.version" +#endif +#ifndef SECTION_ASM_OP +#define SECTION_ASM_OP "\t.section" +#endif +#ifndef UNALIGNED_SHORT_ASM_OP +#define UNALIGNED_SHORT_ASM_OP "\t.2byte" +#endif +#ifndef UNALIGNED_INT_ASM_OP +#define UNALIGNED_INT_ASM_OP "\t.4byte" +#endif +#ifndef DEF_ASM_OP +#define DEF_ASM_OP "\t.set" +#endif + +/* This macro is already used elsewhere and has a published default. */ +#ifndef ASM_BYTE_OP +#define ASM_BYTE_OP "\t.byte" +#endif + +/* Definitions of defaults for formats and names of various special + (artificial) labels which may be generated within this file (when + the -g options is used and DWARF_DEBUGGING_INFO is in effect. + + If necessary, these may be overridden from within your tm.h file, + but typically, you should never need to override these. */ + +#ifndef TEXT_BEGIN_LABEL +#define TEXT_BEGIN_LABEL "._text_b" +#endif +#ifndef TEXT_END_LABEL +#define TEXT_END_LABEL "._text_e" +#endif + +#ifndef DATA_BEGIN_LABEL +#define DATA_BEGIN_LABEL "._data_b" +#endif +#ifndef DATA_END_LABEL +#define DATA_END_LABEL "._data_e" +#endif + +#ifndef DATA1_BEGIN_LABEL +#define DATA1_BEGIN_LABEL "._data1_b" +#endif +#ifndef DATA1_END_LABEL +#define DATA1_END_LABEL "._data1_e" +#endif + +#ifndef RODATA_BEGIN_LABEL +#define RODATA_BEGIN_LABEL "._rodata_b" +#endif +#ifndef RODATA_END_LABEL +#define RODATA_END_LABEL "._rodata_e" +#endif + +#ifndef RODATA1_BEGIN_LABEL +#define RODATA1_BEGIN_LABEL "._rodata1_b" +#endif +#ifndef RODATA1_END_LABEL +#define RODATA1_END_LABEL "._rodata1_e" +#endif + +#ifndef BSS_BEGIN_LABEL +#define BSS_BEGIN_LABEL "._bss_b" +#endif +#ifndef BSS_END_LABEL +#define BSS_END_LABEL "._bss_e" +#endif + +#ifndef LINE_BEGIN_LABEL +#define LINE_BEGIN_LABEL "._line_b" +#endif +#ifndef LINE_LAST_ENTRY_LABEL +#define LINE_LAST_ENTRY_LABEL "._line_last" +#endif +#ifndef LINE_END_LABEL +#define LINE_END_LABEL "._line_e" +#endif + +#ifndef DEBUG_BEGIN_LABEL +#define DEBUG_BEGIN_LABEL "._debug_b" +#endif +#ifndef SFNAMES_BEGIN_LABEL +#define SFNAMES_BEGIN_LABEL "._sfnames_b" +#endif +#ifndef SRCINFO_BEGIN_LABEL +#define SRCINFO_BEGIN_LABEL "._srcinfo_b" +#endif +#ifndef MACINFO_BEGIN_LABEL +#define MACINFO_BEGIN_LABEL "._macinfo_b" +#endif + +#ifndef DIE_BEGIN_LABEL_FMT +#define DIE_BEGIN_LABEL_FMT "._D%u" +#endif +#ifndef DIE_END_LABEL_FMT +#define DIE_END_LABEL_FMT "._D%u_e" +#endif +#ifndef PUB_DIE_LABEL_FMT +#define PUB_DIE_LABEL_FMT "._P%u" +#endif +#ifndef INSN_LABEL_FMT +#define INSN_LABEL_FMT "._I%u_%u" +#endif +#ifndef BLOCK_BEGIN_LABEL_FMT +#define BLOCK_BEGIN_LABEL_FMT "._B%u" +#endif +#ifndef BLOCK_END_LABEL_FMT +#define BLOCK_END_LABEL_FMT "._B%u_e" +#endif +#ifndef SS_BEGIN_LABEL_FMT +#define SS_BEGIN_LABEL_FMT "._s%u" +#endif +#ifndef SS_END_LABEL_FMT +#define SS_END_LABEL_FMT "._s%u_e" +#endif +#ifndef EE_BEGIN_LABEL_FMT +#define EE_BEGIN_LABEL_FMT "._e%u" +#endif +#ifndef EE_END_LABEL_FMT +#define EE_END_LABEL_FMT "._e%u_e" +#endif +#ifndef MT_BEGIN_LABEL_FMT +#define MT_BEGIN_LABEL_FMT "._t%u" +#endif +#ifndef MT_END_LABEL_FMT +#define MT_END_LABEL_FMT "._t%u_e" +#endif +#ifndef LOC_BEGIN_LABEL_FMT +#define LOC_BEGIN_LABEL_FMT "._l%u" +#endif +#ifndef LOC_END_LABEL_FMT +#define LOC_END_LABEL_FMT "._l%u_e" +#endif +#ifndef BOUND_BEGIN_LABEL_FMT +#define BOUND_BEGIN_LABEL_FMT "._b%u_%u_%c" +#endif +#ifndef BOUND_END_LABEL_FMT +#define BOUND_END_LABEL_FMT "._b%u_%u_%c_e" +#endif +#ifndef DERIV_BEGIN_LABEL_FMT +#define DERIV_BEGIN_LABEL_FMT "._d%u" +#endif +#ifndef DERIV_END_LABEL_FMT +#define DERIV_END_LABEL_FMT "._d%u_e" +#endif +#ifndef SL_BEGIN_LABEL_FMT +#define SL_BEGIN_LABEL_FMT "._sl%u" +#endif +#ifndef SL_END_LABEL_FMT +#define SL_END_LABEL_FMT "._sl%u_e" +#endif +#ifndef FUNC_END_LABEL_FMT +#define FUNC_END_LABEL_FMT "._f%u_e" +#endif +#ifndef TYPE_NAME_FMT +#define TYPE_NAME_FMT "._T%u" +#endif +#ifndef LINE_CODE_LABEL_FMT +#define LINE_CODE_LABEL_FMT "._LC%u" +#endif +#ifndef SFNAMES_ENTRY_LABEL_FMT +#define SFNAMES_ENTRY_LABEL_FMT "._F%u" +#endif +#ifndef LINE_ENTRY_LABEL_FMT +#define LINE_ENTRY_LABEL_FMT "._LE%u" +#endif + +/* Definitions of defaults for various types of primitive assembly language + output operations. + + If necessary, these may be overridden from within your tm.h file, + but typically, you should never need to override these. */ + +#ifndef ASM_OUTPUT_SOURCE_FILENAME +#define ASM_OUTPUT_SOURCE_FILENAME(FILE,NAME) \ + fprintf ((FILE), "%s\t\"%s\"\n", FILE_ASM_OP, NAME) +#endif + +#ifndef ASM_OUTPUT_DEF +#define ASM_OUTPUT_DEF(FILE,LABEL1,LABEL2) \ + do { fprintf ((FILE), "%s\t", DEF_ASM_OP); \ + assemble_name (FILE, LABEL1); \ + fprintf (FILE, ","); \ + assemble_name (FILE, LABEL2); \ + fprintf (FILE, "\n"); \ + } while (0) +#endif + +#ifndef ASM_DWARF_DEBUG_SECTION +#define ASM_DWARF_DEBUG_SECTION(FILE) \ + fprintf ((FILE), "%s\t.debug\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_LINE_SECTION +#define ASM_DWARF_LINE_SECTION(FILE) \ + fprintf ((FILE), "%s\t.line\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_SFNAMES_SECTION +#define ASM_DWARF_SFNAMES_SECTION(FILE) \ + fprintf ((FILE), "%s\t.debug_sfnames\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_SRCINFO_SECTION +#define ASM_DWARF_SRCINFO_SECTION(FILE) \ + fprintf ((FILE), "%s\t.debug_srcinfo\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_MACINFO_SECTION +#define ASM_DWARF_MACINFO_SECTION(FILE) \ + fprintf ((FILE), "%s\t.debug_macinfo\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_PUBNAMES_SECTION +#define ASM_DWARF_PUBNAMES_SECTION(FILE) \ + fprintf ((FILE), "%s\t.debug_pubnames\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_ARANGES_SECTION +#define ASM_DWARF_ARANGES_SECTION(FILE) \ + fprintf ((FILE), "%s\t.debug_aranges\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_TEXT_SECTION +#define ASM_DWARF_TEXT_SECTION(FILE) \ + fprintf ((FILE), "%s\t.text\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_DATA_SECTION +#define ASM_DWARF_DATA_SECTION(FILE) \ + fprintf ((FILE), "%s\t.data\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_DATA1_SECTION +#define ASM_DWARF_DATA1_SECTION(FILE) \ + fprintf ((FILE), "%s\t.data1\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_RODATA_SECTION +#define ASM_DWARF_RODATA_SECTION(FILE) \ + fprintf ((FILE), "%s\t.rodata\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_RODATA1_SECTION +#define ASM_DWARF_RODATA1_SECTION(FILE) \ + fprintf ((FILE), "%s\t.rodata1\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_BSS_SECTION +#define ASM_DWARF_BSS_SECTION(FILE) \ + fprintf ((FILE), "%s\t.bss\n", SECTION_ASM_OP) +#endif + +#ifndef ASM_DWARF_POP_SECTION +#define ASM_DWARF_POP_SECTION(FILE) \ + fprintf ((FILE), "\t.previous\n") +#endif + +#ifndef ASM_OUTPUT_DWARF_DELTA2 +#define ASM_OUTPUT_DWARF_DELTA2(FILE,LABEL1,LABEL2) \ + do { fprintf ((FILE), "%s\t", UNALIGNED_SHORT_ASM_OP); \ + assemble_name (FILE, LABEL1); \ + fprintf (FILE, "-"); \ + assemble_name (FILE, LABEL2); \ + fprintf (FILE, "\n"); \ + } while (0) +#endif + +#ifndef ASM_OUTPUT_DWARF_DELTA4 +#define ASM_OUTPUT_DWARF_DELTA4(FILE,LABEL1,LABEL2) \ + do { fprintf ((FILE), "%s\t", UNALIGNED_INT_ASM_OP); \ + assemble_name (FILE, LABEL1); \ + fprintf (FILE, "-"); \ + assemble_name (FILE, LABEL2); \ + fprintf (FILE, "\n"); \ + } while (0) +#endif + +#ifndef ASM_OUTPUT_DWARF_TAG +#define ASM_OUTPUT_DWARF_TAG(FILE,TAG) \ + fprintf ((FILE), "%s\t0x%x\t%s %s\n", UNALIGNED_SHORT_ASM_OP, \ + (unsigned) TAG, ASM_COMMENT_START, tag_name (TAG)) +#endif + +#ifndef ASM_OUTPUT_DWARF_ATTRIBUTE +#define ASM_OUTPUT_DWARF_ATTRIBUTE(FILE,ATTRIBUTE) \ + fprintf ((FILE), "%s\t0x%x\t%s %s\n", UNALIGNED_SHORT_ASM_OP, \ + (unsigned) ATTRIBUTE, ASM_COMMENT_START, attribute_name (ATTRIBUTE)) +#endif + +#ifndef ASM_OUTPUT_DWARF_STACK_OP +#define ASM_OUTPUT_DWARF_STACK_OP(FILE,OP) \ + fprintf ((FILE), "%s\t0x%x\t%s %s\n", ASM_BYTE_OP, \ + (unsigned) OP, ASM_COMMENT_START, stack_op_name (OP)) +#endif + +#ifndef ASM_OUTPUT_DWARF_FUND_TYPE +#define ASM_OUTPUT_DWARF_FUND_TYPE(FILE,FT) \ + fprintf ((FILE), "%s\t0x%x\t%s %s\n", UNALIGNED_SHORT_ASM_OP, \ + (unsigned) FT, ASM_COMMENT_START, fundamental_type_name (FT)) +#endif + +#ifndef ASM_OUTPUT_DWARF_FMT_BYTE +#define ASM_OUTPUT_DWARF_FMT_BYTE(FILE,FMT) \ + fprintf ((FILE), "%s\t0x%x\t%s %s\n", ASM_BYTE_OP, \ + (unsigned) FMT, ASM_COMMENT_START, format_byte_name (FMT)) +#endif + +#ifndef ASM_OUTPUT_DWARF_TYPE_MODIFIER +#define ASM_OUTPUT_DWARF_TYPE_MODIFIER(FILE,MOD) \ + fprintf ((FILE), "%s\t0x%x\t%s %s\n", ASM_BYTE_OP, \ + (unsigned) MOD, ASM_COMMENT_START, modifier_name (MOD)) +#endif + +#ifndef ASM_OUTPUT_DWARF_ADDR +#define ASM_OUTPUT_DWARF_ADDR(FILE,LABEL) \ + do { fprintf ((FILE), "%s\t", UNALIGNED_INT_ASM_OP); \ + assemble_name (FILE, LABEL); \ + fprintf (FILE, "\n"); \ + } while (0) +#endif + +#ifndef ASM_OUTPUT_DWARF_ADDR_CONST +#define ASM_OUTPUT_DWARF_ADDR_CONST(FILE,RTX) \ + fprintf ((FILE), "%s\t", UNALIGNED_INT_ASM_OP); \ + output_addr_const ((FILE), (RTX)); \ + fputc ('\n', (FILE)) +#endif + +#ifndef ASM_OUTPUT_DWARF_REF +#define ASM_OUTPUT_DWARF_REF(FILE,LABEL) \ + do { fprintf ((FILE), "%s\t", UNALIGNED_INT_ASM_OP); \ + assemble_name (FILE, LABEL); \ + fprintf (FILE, "\n"); \ + } while (0) +#endif + +#ifndef ASM_OUTPUT_DWARF_DATA1 +#define ASM_OUTPUT_DWARF_DATA1(FILE,VALUE) \ + fprintf ((FILE), "%s\t0x%x\n", ASM_BYTE_OP, VALUE) +#endif + +#ifndef ASM_OUTPUT_DWARF_DATA2 +#define ASM_OUTPUT_DWARF_DATA2(FILE,VALUE) \ + fprintf ((FILE), "%s\t0x%x\n", UNALIGNED_SHORT_ASM_OP, (unsigned) VALUE) +#endif + +#ifndef ASM_OUTPUT_DWARF_DATA4 +#define ASM_OUTPUT_DWARF_DATA4(FILE,VALUE) \ + fprintf ((FILE), "%s\t0x%x\n", UNALIGNED_INT_ASM_OP, (unsigned) VALUE) +#endif + +#ifndef ASM_OUTPUT_DWARF_DATA8 +#define ASM_OUTPUT_DWARF_DATA8(FILE,HIGH_VALUE,LOW_VALUE) \ + do { \ + if (WORDS_BIG_ENDIAN) \ + { \ + fprintf ((FILE), "%s\t0x%x\n", UNALIGNED_INT_ASM_OP, HIGH_VALUE); \ + fprintf ((FILE), "%s\t0x%x\n", UNALIGNED_INT_ASM_OP, LOW_VALUE);\ + } \ + else \ + { \ + fprintf ((FILE), "%s\t0x%x\n", UNALIGNED_INT_ASM_OP, LOW_VALUE);\ + fprintf ((FILE), "%s\t0x%x\n", UNALIGNED_INT_ASM_OP, HIGH_VALUE); \ + } \ + } while (0) +#endif + +#ifndef ASM_OUTPUT_DWARF_STRING +#define ASM_OUTPUT_DWARF_STRING(FILE,P) \ + ASM_OUTPUT_ASCII ((FILE), P, strlen (P)+1) +#endif + +/************************ general utility functions **************************/ + +inline char * +xstrdup (s) + register char *s; +{ + register char *p = (char *) xmalloc (strlen (s) + 1); + + strcpy (p, s); + return p; +} + +static char * +tag_name (tag) + register unsigned tag; +{ + switch (tag) + { + case TAG_padding: return "TAG_padding"; + case TAG_array_type: return "TAG_array_type"; + case TAG_class_type: return "TAG_class_type"; + case TAG_entry_point: return "TAG_entry_point"; + case TAG_enumeration_type: return "TAG_enumeration_type"; + case TAG_formal_parameter: return "TAG_formal_parameter"; + case TAG_global_subroutine: return "TAG_global_subroutine"; + case TAG_global_variable: return "TAG_global_variable"; + case TAG_imported_declaration: return "TAG_imported_declaration"; + case TAG_label: return "TAG_label"; + case TAG_lexical_block: return "TAG_lexical_block"; + case TAG_local_variable: return "TAG_local_variable"; + case TAG_member: return "TAG_member"; + case TAG_pointer_type: return "TAG_pointer_type"; + case TAG_reference_type: return "TAG_reference_type"; + case TAG_compile_unit: return "TAG_compile_unit"; + case TAG_string_type: return "TAG_string_type"; + case TAG_structure_type: return "TAG_structure_type"; + case TAG_subroutine: return "TAG_subroutine"; + case TAG_subroutine_type: return "TAG_subroutine_type"; + case TAG_typedef: return "TAG_typedef"; + case TAG_union_type: return "TAG_union_type"; + case TAG_unspecified_parameters: return "TAG_unspecified_parameters"; + case TAG_variant: return "TAG_variant"; + case TAG_format: return "TAG_format"; + case TAG_with_stmt: return "TAG_with_stmt"; + case TAG_set_type: return "TAG_set_type"; + default: return "<unknown tag>"; + } +} + +static char * +attribute_name (attr) + register unsigned attr; +{ + switch (attr) + { + case AT_sibling: return "AT_sibling"; + case AT_location: return "AT_location"; + case AT_name: return "AT_name"; + case AT_fund_type: return "AT_fund_type"; + case AT_mod_fund_type: return "AT_mod_fund_type"; + case AT_user_def_type: return "AT_user_def_type"; + case AT_mod_u_d_type: return "AT_mod_u_d_type"; + case AT_ordering: return "AT_ordering"; + case AT_subscr_data: return "AT_subscr_data"; + case AT_byte_size: return "AT_byte_size"; + case AT_bit_offset: return "AT_bit_offset"; + case AT_bit_size: return "AT_bit_size"; + case AT_element_list: return "AT_element_list"; + case AT_stmt_list: return "AT_stmt_list"; + case AT_low_pc: return "AT_low_pc"; + case AT_high_pc: return "AT_high_pc"; + case AT_language: return "AT_language"; + case AT_member: return "AT_member"; + case AT_discr: return "AT_discr"; + case AT_discr_value: return "AT_discr_value"; + case AT_visibility: return "AT_visibility"; + case AT_import: return "AT_import"; + case AT_string_length: return "AT_string_length"; + case AT_comp_dir: return "AT_comp_dir"; + case AT_producer: return "AT_producer"; + case AT_frame_base: return "AT_frame_base"; + case AT_start_scope: return "AT_start_scope"; + case AT_stride_size: return "AT_stride_size"; + case AT_src_info: return "AT_src_info"; + case AT_prototyped: return "AT_prototyped"; + case AT_const_value_block4: return "AT_const_value_block4"; + case AT_sf_names: return "AT_sf_names"; + case AT_mac_info: return "AT_mac_info"; + default: return "<unknown attribute>"; + } +} + +static char * +stack_op_name (op) + register unsigned op; +{ + switch (op) + { + case OP_REG: return "OP_REG"; + case OP_BASEREG: return "OP_BASEREG"; + case OP_ADDR: return "OP_ADDR"; + case OP_CONST: return "OP_CONST"; + case OP_DEREF2: return "OP_DEREF2"; + case OP_DEREF4: return "OP_DEREF4"; + case OP_ADD: return "OP_ADD"; + default: return "<unknown stack operator>"; + } +} + +static char * +modifier_name (mod) + register unsigned mod; +{ + switch (mod) + { + case MOD_pointer_to: return "MOD_pointer_to"; + case MOD_reference_to: return "MOD_reference_to"; + case MOD_const: return "MOD_const"; + case MOD_volatile: return "MOD_volatile"; + default: return "<unknown modifier>"; + } +} + +static char * +format_byte_name (fmt) + register unsigned fmt; +{ + switch (fmt) + { + case FMT_FT_C_C: return "FMT_FT_C_C"; + case FMT_FT_C_X: return "FMT_FT_C_X"; + case FMT_FT_X_C: return "FMT_FT_X_C"; + case FMT_FT_X_X: return "FMT_FT_X_X"; + case FMT_UT_C_C: return "FMT_UT_C_C"; + case FMT_UT_C_X: return "FMT_UT_C_X"; + case FMT_UT_X_C: return "FMT_UT_X_C"; + case FMT_UT_X_X: return "FMT_UT_X_X"; + case FMT_ET: return "FMT_ET"; + default: return "<unknown array bound format byte>"; + } +} +static char * +fundamental_type_name (ft) + register unsigned ft; +{ + switch (ft) + { + case FT_char: return "FT_char"; + case FT_signed_char: return "FT_signed_char"; + case FT_unsigned_char: return "FT_unsigned_char"; + case FT_short: return "FT_short"; + case FT_signed_short: return "FT_signed_short"; + case FT_unsigned_short: return "FT_unsigned_short"; + case FT_integer: return "FT_integer"; + case FT_signed_integer: return "FT_signed_integer"; + case FT_unsigned_integer: return "FT_unsigned_integer"; + case FT_long: return "FT_long"; + case FT_signed_long: return "FT_signed_long"; + case FT_unsigned_long: return "FT_unsigned_long"; + case FT_pointer: return "FT_pointer"; + case FT_float: return "FT_float"; + case FT_dbl_prec_float: return "FT_dbl_prec_float"; + case FT_ext_prec_float: return "FT_ext_prec_float"; + case FT_complex: return "FT_complex"; + case FT_dbl_prec_complex: return "FT_dbl_prec_complex"; + case FT_void: return "FT_void"; + case FT_boolean: return "FT_boolean"; + case FT_long_long: return "FT_long_long"; + case FT_signed_long_long: return "FT_signed_long_long"; + case FT_unsigned_long_long: return "FT_unsigned_long_long"; + default: return "<unknown fundamental type>"; + } +} + +/**************** utility functions for attribute functions ******************/ + +/* Given a pointer to a tree node for some type, return a Dwarf fundamental + type code for the given type. + + This routine must only be called for GCC type nodes that correspond to + Dwarf fundamental types. + + The current Dwarf draft specification calls for Dwarf fundamental types + to accurately reflect the fact that a given type was either a "plain" + integral type or an explicitly "signed" integral type. Unfortuantely, + we can't always do this, because GCC may already have thrown away the + information about the precise way in which the type was originally + specified, as in: + + typedef signed int field_type; + + struct s { field_type f; }; + + Since we may be stuck here without enought information to do exactly + what is called for in the Dwarf draft specification, we do the best + that we can under the circumstances and always use the "plain" integral + fundamental type codes for int, short, and long types. That's probably + good enough. The additional accuracy called for in the current DWARF + draft specification is probably never even useful in practice. */ + +static int +fundamental_type_code (type) + register tree type; +{ + if (TREE_CODE (type) == ERROR_MARK) + return 0; + + switch (TREE_CODE (type)) + { + case ERROR_MARK: + return FT_void; + + case VOID_TYPE: + return FT_void; + + case INTEGER_TYPE: + /* Carefully distinguish all the standard types of C, + without messing up if the language is not C. + Note that we check only for the names that contain spaces; + other names might occur by coincidence in other languages. */ + if (TYPE_NAME (type) != 0 + && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL + && DECL_NAME (TYPE_NAME (type)) != 0 + && TREE_CODE (DECL_NAME (TYPE_NAME (type))) == IDENTIFIER_NODE) + { + char *name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))); + + if (!strcmp (name, "unsigned char")) + return FT_unsigned_char; + if (!strcmp (name, "signed char")) + return FT_signed_char; + if (!strcmp (name, "unsigned int")) + return FT_unsigned_integer; + if (!strcmp (name, "short int")) + return FT_short; + if (!strcmp (name, "short unsigned int")) + return FT_unsigned_short; + if (!strcmp (name, "long int")) + return FT_long; + if (!strcmp (name, "long unsigned int")) + return FT_unsigned_long; + if (!strcmp (name, "long long int")) + return FT_long_long; /* Not grok'ed by svr4 SDB */ + if (!strcmp (name, "long long unsigned int")) + return FT_unsigned_long_long; /* Not grok'ed by svr4 SDB */ + } + + /* Most integer types will be sorted out above, however, for the + sake of special `array index' integer types, the following code + is also provided. */ + + if (TYPE_PRECISION (type) == INT_TYPE_SIZE) + return (TREE_UNSIGNED (type) ? FT_unsigned_integer : FT_integer); + + if (TYPE_PRECISION (type) == LONG_TYPE_SIZE) + return (TREE_UNSIGNED (type) ? FT_unsigned_long : FT_long); + + if (TYPE_PRECISION (type) == LONG_LONG_TYPE_SIZE) + return (TREE_UNSIGNED (type) ? FT_unsigned_long_long : FT_long_long); + + if (TYPE_PRECISION (type) == SHORT_TYPE_SIZE) + return (TREE_UNSIGNED (type) ? FT_unsigned_short : FT_short); + + if (TYPE_PRECISION (type) == CHAR_TYPE_SIZE) + return (TREE_UNSIGNED (type) ? FT_unsigned_char : FT_char); + + abort (); + + case REAL_TYPE: + /* Carefully distinguish all the standard types of C, + without messing up if the language is not C. */ + if (TYPE_NAME (type) != 0 + && TREE_CODE (TYPE_NAME (type)) == TYPE_DECL + && DECL_NAME (TYPE_NAME (type)) != 0 + && TREE_CODE (DECL_NAME (TYPE_NAME (type))) == IDENTIFIER_NODE) + { + char *name = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (type))); + + /* Note that here we can run afowl of a serious bug in "classic" + svr4 SDB debuggers. They don't seem to understand the + FT_ext_prec_float type (even though they should). */ + + if (!strcmp (name, "long double")) + return FT_ext_prec_float; + } + + if (TYPE_PRECISION (type) == DOUBLE_TYPE_SIZE) + return FT_dbl_prec_float; + if (TYPE_PRECISION (type) == FLOAT_TYPE_SIZE) + return FT_float; + + /* Note that here we can run afowl of a serious bug in "classic" + svr4 SDB debuggers. They don't seem to understand the + FT_ext_prec_float type (even though they should). */ + + if (TYPE_PRECISION (type) == LONG_DOUBLE_TYPE_SIZE) + return FT_ext_prec_float; + abort (); + + case COMPLEX_TYPE: + return FT_complex; /* GNU FORTRAN COMPLEX type. */ + + case CHAR_TYPE: + return FT_char; /* GNU Pascal CHAR type. Not used in C. */ + + case BOOLEAN_TYPE: + return FT_boolean; /* GNU FORTRAN BOOLEAN type. */ + + default: + abort (); /* No other TREE_CODEs are Dwarf fundamental types. */ + } + return 0; +} + +/* Given a pointer to an arbitrary ..._TYPE tree node, return a pointer to + the Dwarf "root" type for the given input type. The Dwarf "root" type + of a given type is generally the same as the given type, except that if + the given type is a pointer or reference type, then the root type of + the given type is the root type of the "basis" type for the pointer or + reference type. (This definition of the "root" type is recursive.) + Also, the root type of a `const' qualified type or a `volatile' + qualified type is the root type of the given type without the + qualifiers. */ + +static tree +root_type (type) + register tree type; +{ + if (TREE_CODE (type) == ERROR_MARK) + return error_mark_node; + + switch (TREE_CODE (type)) + { + case ERROR_MARK: + return error_mark_node; + + case POINTER_TYPE: + case REFERENCE_TYPE: + return TYPE_MAIN_VARIANT (root_type (TREE_TYPE (type))); + + default: + return TYPE_MAIN_VARIANT (type); + } +} + +/* Given a pointer to an arbitrary ..._TYPE tree node, write out a sequence + of zero or more Dwarf "type-modifier" bytes applicable to the type. */ + +static void +write_modifier_bytes (type, decl_const, decl_volatile) + register tree type; + register int decl_const; + register int decl_volatile; +{ + if (TREE_CODE (type) == ERROR_MARK) + return; + + if (TYPE_READONLY (type) || decl_const) + ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_const); + if (TYPE_VOLATILE (type) || decl_volatile) + ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_volatile); + switch (TREE_CODE (type)) + { + case POINTER_TYPE: + ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_pointer_to); + write_modifier_bytes (TREE_TYPE (type), 0, 0); + return; + + case REFERENCE_TYPE: + ASM_OUTPUT_DWARF_TYPE_MODIFIER (asm_out_file, MOD_reference_to); + write_modifier_bytes (TREE_TYPE (type), 0, 0); + return; + + case ERROR_MARK: + default: + return; + } +} + +/* Given a pointer to an arbitrary ..._TYPE tree node, return non-zero if the + given input type is a Dwarf "fundamental" type. Otherwise return zero. */ + +inline int +type_is_fundamental (type) + register tree type; +{ + switch (TREE_CODE (type)) + { + case ERROR_MARK: + case VOID_TYPE: + case INTEGER_TYPE: + case REAL_TYPE: + case COMPLEX_TYPE: + case BOOLEAN_TYPE: + case CHAR_TYPE: + return 1; + + case SET_TYPE: + case ARRAY_TYPE: + case RECORD_TYPE: + case UNION_TYPE: + case ENUMERAL_TYPE: + case FUNCTION_TYPE: + case METHOD_TYPE: + case POINTER_TYPE: + case REFERENCE_TYPE: + case STRING_TYPE: + case FILE_TYPE: + case OFFSET_TYPE: + case LANG_TYPE: + return 0; + + default: + abort (); + } + return 0; +} + +/* Given a pointer to some ..._TYPE tree node, generate an assembly language + equate directive which will associate an easily remembered symbolic name + with the current DIE. + + The name used is an artificial label generated from the TYPE_UID number + associated with the given type node. The name it gets equated to is the + symbolic label that we (previously) output at the start of the DIE that + we are currently generating. + + Calling this function while generating some "type related" form of DIE + makes it easy to later refer to the DIE which represents the given type + simply by re-generating the alternative name from the ..._TYPE node's + UID number. */ + +inline void +equate_type_number_to_die_number (type) + register tree type; +{ + char type_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char die_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + /* We are generating a DIE to represent the main variant of this type + (i.e the type without any const or volatile qualifiers) so in order + to get the equate to come out right, we need to get the main variant + itself here. */ + + type = TYPE_MAIN_VARIANT (type); + + sprintf (type_label, TYPE_NAME_FMT, TYPE_UID (type)); + sprintf (die_label, DIE_BEGIN_LABEL_FMT, current_dienum); + ASM_OUTPUT_DEF (asm_out_file, type_label, die_label); +} + +/* The following routine is a nice and simple transducer. It converts the + RTL for a variable or parameter (resident in memory) into an equivalent + Dwarf representation of a mechanism for getting the address of that same + variable onto the top of a hypothetical "address evaluation" stack. + + When creating memory location descriptors, we are effectively trans- + forming the RTL for a memory-resident object into its Dwarf postfix + expression equivalent. This routine just recursively descends an + RTL tree, turning it into Dwarf postfix code as it goes. */ + +static void +output_mem_loc_descriptor (rtl) + register rtx rtl; +{ + /* Note that for a dynamically sized array, the location we will + generate a description of here will be the lowest numbered location + which is actually within the array. That's *not* necessarily the + same as the zeroth element of the array. */ + + switch (GET_CODE (rtl)) + { + case SUBREG: + + /* The case of a subreg may arise when we have a local (register) + variable or a formal (register) parameter which doesn't quite + fill up an entire register. For now, just assume that it is + legitimate to make the Dwarf info refer to the whole register + which contains the given subreg. */ + + rtl = XEXP (rtl, 0); + /* Drop thru. */ + + case REG: + + /* Whenever a register number forms a part of the description of + the method for calculating the (dynamic) address of a memory + resident object, Dwarf rules require the register number to + be referred to as a "base register". This distinction is not + based in any way upon what category of register the hardware + believes the given register belongs to. This is strictly + Dwarf terminology we're dealing with here. */ + + ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_BASEREG); + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, + DBX_REGISTER_NUMBER (REGNO (rtl))); + break; + + case MEM: + output_mem_loc_descriptor (XEXP (rtl, 0)); + ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_DEREF4); + break; + + case CONST: + case SYMBOL_REF: + ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_ADDR); + ASM_OUTPUT_DWARF_ADDR_CONST (asm_out_file, rtl); + break; + + case PLUS: + output_mem_loc_descriptor (XEXP (rtl, 0)); + output_mem_loc_descriptor (XEXP (rtl, 1)); + ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_ADD); + break; + + case CONST_INT: + ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_CONST); + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, INTVAL (rtl)); + break; + + default: + abort (); + } +} + +/* Output a proper Dwarf location descriptor for a variable or parameter + which is either allocated in a register or in a memory location. For + a register, we just generate an OP_REG and the register number. For a + memory location we provide a Dwarf postfix expression describing how to + generate the (dynamic) address of the object onto the address stack. */ + +static void +output_loc_descriptor (rtl) + register rtx rtl; +{ + switch (GET_CODE (rtl)) + { + case SUBREG: + + /* The case of a subreg may arise when we have a local (register) + variable or a formal (register) parameter which doesn't quite + fill up an entire register. For now, just assume that it is + legitimate to make the Dwarf info refer to the whole register + which contains the given subreg. */ + + rtl = XEXP (rtl, 0); + /* Drop thru. */ + + case REG: + ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_REG); + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, + DBX_REGISTER_NUMBER (REGNO (rtl))); + break; + + case MEM: + output_mem_loc_descriptor (XEXP (rtl, 0)); + break; + + default: + abort (); /* Should never happen */ + } +} + +/* Given a tree node describing an array bound (either lower or upper) + output a representation for that bound. */ + +static void +output_bound_representation (bound, dim_num, u_or_l) + register tree bound; + register unsigned dim_num; /* For multi-dimensional arrays. */ + register char u_or_l; /* Designates upper or lower bound. */ +{ + switch (TREE_CODE (bound)) + { + + case ERROR_MARK: + return; + + /* All fixed-bounds are represented by INTEGER_CST nodes. */ + + case INTEGER_CST: + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, + (unsigned) TREE_INT_CST_LOW (bound)); + break; + + /* Dynamic bounds may be represented by NOP_EXPR nodes containing + SAVE_EXPR nodes. */ + + case NOP_EXPR: + bound = TREE_OPERAND (bound, 0); + /* ... fall thru... */ + + case SAVE_EXPR: + { + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + sprintf (begin_label, BOUND_BEGIN_LABEL_FMT, + current_dienum, dim_num, u_or_l); + + sprintf (end_label, BOUND_END_LABEL_FMT, + current_dienum, dim_num, u_or_l); + + ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label); + ASM_OUTPUT_LABEL (asm_out_file, begin_label); + + /* If we are working on a bound for a dynamic dimension in C, + the dynamic dimension in question had better have a static + (zero) lower bound and a dynamic *upper* bound. */ + + if (u_or_l != 'u') + abort (); + + /* If optimization is turned on, the SAVE_EXPRs that describe + how to access the upper bound values are essentially bogus. + They only describe (at best) how to get at these values at + the points in the generated code right after they have just + been computed. Worse yet, in the typical case, the upper + bound values will not even *be* computed in the optimized + code, so these SAVE_EXPRs are entirely bogus. + + In order to compensate for this fact, we check here to see + if optimization is enabled, and if so, we effectively create + an empty location description for the (unknown and unknowable) + upper bound. + + This should not cause too much trouble for existing (stupid?) + debuggers because they have to deal with empty upper bounds + location descriptions anyway in order to be able to deal with + incomplete array types. + + Of course an intelligent debugger (GDB?) should be able to + comprehend that a missing upper bound specification in a + array type used for a storage class `auto' local array variable + indicates that the upper bound is both unknown (at compile- + time) and unknowable (at run-time) due to optimization. + */ + + if (! optimize) + output_loc_descriptor + (eliminate_regs (SAVE_EXPR_RTL (bound), 0, 0)); + + ASM_OUTPUT_LABEL (asm_out_file, end_label); + } + break; + + default: + abort (); + } +} + +/* Recursive function to output a sequence of value/name pairs for + enumeration constants in reversed order. This is called from + enumeration_type_die. */ + +static void +output_enumeral_list (link) + register tree link; +{ + if (link) + { + output_enumeral_list (TREE_CHAIN (link)); + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, + (unsigned) TREE_INT_CST_LOW (TREE_VALUE (link))); + ASM_OUTPUT_DWARF_STRING (asm_out_file, + IDENTIFIER_POINTER (TREE_PURPOSE (link))); + } +} + +/****************************** attributes *********************************/ + +/* The following routines are responsible for writing out the various types + of Dwarf attributes (and any following data bytes associated with them). + These routines are listed in order based on the numerical codes of their + associated attributes. */ + +/* Generate an AT_sibling attribute. */ + +inline void +sibling_attribute () +{ + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_sibling); + sprintf (label, DIE_BEGIN_LABEL_FMT, NEXT_DIE_NUM); + ASM_OUTPUT_DWARF_REF (asm_out_file, label); +} + +/* Output the form of location attributes suitable for whole variables and + whole parameters. Note that the location attributes for struct fields + are generated by the routine `data_member_location_attribute' below. */ + +static void +location_attribute (rtl) + register rtx rtl; +{ + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_location); + sprintf (begin_label, LOC_BEGIN_LABEL_FMT, current_dienum); + sprintf (end_label, LOC_END_LABEL_FMT, current_dienum); + ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label); + ASM_OUTPUT_LABEL (asm_out_file, begin_label); + + /* Handle a special case. If we are about to output a location descriptor + for a variable or parameter which has been optimized out of existance, + don't do that. Instead we output a zero-length location descriptor + value as part of the location attribute. Note that we cannot simply + suppress the entire location attribute, because the absence of a + location attribute in certain kinds of DIEs is used to indicate some- + thing entirely different... i.e. that the DIE represents an object + declaration, but not a definition. So sayeth the PLSIG. */ + + if (((GET_CODE (rtl) != REG) || (REGNO (rtl) < FIRST_PSEUDO_REGISTER)) + && ((GET_CODE (rtl) != SUBREG) + || (REGNO (XEXP (rtl, 0)) < FIRST_PSEUDO_REGISTER))) + output_loc_descriptor (eliminate_regs (rtl, 0, 0)); + + ASM_OUTPUT_LABEL (asm_out_file, end_label); +} + +/* Output the specialized form of location attribute used for data members + of struct types. */ + +static void +data_member_location_attribute (decl) + register tree decl; +{ + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + if (TREE_CODE (decl) == ERROR_MARK) + return; + + if (TREE_CODE (decl) != FIELD_DECL) + abort (); + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_location); + sprintf (begin_label, LOC_BEGIN_LABEL_FMT, current_dienum); + sprintf (end_label, LOC_END_LABEL_FMT, current_dienum); + ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label); + ASM_OUTPUT_LABEL (asm_out_file, begin_label); + ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_CONST); + + /* This is pretty strange, but existing compilers producing DWARF + apparently calculate the byte offset of a field differently + depending upon whether or not it is a bit-field. If the given + field is *not* a bit-field, then the offset is simply the + the byte offset of the given field from the beginning of the + struct. For bit-fields however, the offset is the offset (in + bytes) of the beginning of the *containing word* from the + beginning of the whole struct. */ + + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, + (DECL_BIT_FIELD_TYPE (decl)) + ? BITFIELD_OFFSET_WORDS_IN_UNITS (decl) + : BITFIELD_OFFSET_UNITS (decl)); + ASM_OUTPUT_DWARF_STACK_OP (asm_out_file, OP_ADD); + ASM_OUTPUT_LABEL (asm_out_file, end_label); +} + +/* Output an AT_const_value attribute for a variable or a parameter which + does not have a "location" either in memory or in a register. These + things can arise in GNU C when a constant is passed as an actual + parameter to an inlined function. They can also arise in C++ where + declared constants do not necessarily get memory "homes". */ + +static void +const_value_attribute (rtl) + register rtx rtl; +{ + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_const_value_block4); + sprintf (begin_label, LOC_BEGIN_LABEL_FMT, current_dienum); + sprintf (end_label, LOC_END_LABEL_FMT, current_dienum); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, end_label, begin_label); + ASM_OUTPUT_LABEL (asm_out_file, begin_label); + + switch (GET_CODE (rtl)) + { + case CONST_INT: + /* Note that a CONST_INT rtx could represent either an integer or + a floating-point constant. A CONST_INT is used whenever the + constant will fit into a single word. In all such cases, the + original mode of the constant value is wiped out, and the + CONST_INT rtx is assigned VOIDmode. Since we no longer have + precise mode information for these constants, we always just + output them using 4 bytes. */ + + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, (unsigned) INTVAL (rtl)); + break; + + case CONST_DOUBLE: + /* Note that a CONST_DOUBLE rtx could represent either an integer + or a floating-point constant. A CONST_DOUBLE is used whenever + the constant requires more than one word in order to be adequately + represented. In all such cases, the original mode of the constant + value is preserved as the mode of the CONST_DOUBLE rtx, but for + simplicity we always just output CONST_DOUBLEs using 8 bytes. */ + + ASM_OUTPUT_DWARF_DATA8 (asm_out_file, + (unsigned) CONST_DOUBLE_HIGH (rtl), + (unsigned) CONST_DOUBLE_LOW (rtl)); + break; + + case CONST_STRING: + ASM_OUTPUT_DWARF_STRING (asm_out_file, XSTR (rtl, 0)); + break; + + case SYMBOL_REF: + case LABEL_REF: + case CONST: + ASM_OUTPUT_DWARF_ADDR_CONST (asm_out_file, rtl); + break; + + case PLUS: + /* In cases where an inlined instance of an inline function is passed + the address of an `auto' variable (which is local to the caller) + we can get a situation where the DECL_RTL of the artificial + local variable (for the inlining) which acts as a stand-in for + the corresponding formal parameter (of the inline function) + will look like (plus:SI (reg:SI FRAME_PTR) (const_int ...)). + This is not exactly a compile-time constant expression, but it + isn't the address of the (artificial) local variable either. + Rather, it represents the *value* which the artificial local + variable always has during its lifetime. We currently have no + way to represent such quasi-constant values in Dwarf, so for now + we just punt and generate an AT_const_value attribute with form + FORM_BLOCK4 and a length of zero. */ + break; + } + + ASM_OUTPUT_LABEL (asm_out_file, end_label); +} + +/* Generate *either* an AT_location attribute or else an AT_const_value + data attribute for a variable or a parameter. We generate the + AT_const_value attribute only in those cases where the given + variable or parameter does not have a true "location" either in + memory or in a register. This can happen (for example) when a + constant is passed as an actual argument in a call to an inline + function. (It's possible that these things can crop up in other + ways also.) Note that one type of constant value which can be + passed into an inlined function is a constant pointer. This can + happen for example if an actual argument in an inlined function + call evaluates to a compile-time constant address. */ + +static void +location_or_const_value_attribute (decl) + register tree decl; +{ + register rtx rtl; + + if (TREE_CODE (decl) == ERROR_MARK) + return; + + if ((TREE_CODE (decl) != VAR_DECL) && (TREE_CODE (decl) != PARM_DECL)) + abort (); + + /* It's not really clear what existing Dwarf debuggers need or expect + as regards to location information for formal parameters. A later + version of the Dwarf specification should resolve such issues, but + for the time being, we assume here that debuggers want information + about the location where the parameter was passed into the function. + That seems to be what USL's CI5 compiler generates. Note that this + will probably be different from the place where the parameter actual + resides during function execution. Dwarf Version 2 will provide us + with a means to describe that location also, but for now we can only + describe the "passing" location. */ + +#if 0 /* This is probably right, but it leads to a lot of trouble. + Fixing one problem has been exposing another, + all of which seemed to have no ill effects before. + Better to turn this off for now and try fix it later. */ + rtl = (TREE_CODE (decl) == PARM_DECL) + ? DECL_INCOMING_RTL (decl) + : DECL_RTL (decl); +#endif + rtl = DECL_RTL (decl); + + if (rtl == NULL) + return; + + switch (GET_CODE (rtl)) + { + case CONST_INT: + case CONST_DOUBLE: + case CONST_STRING: + case SYMBOL_REF: + case LABEL_REF: + case CONST: + case PLUS: /* DECL_RTL could be (plus (reg ...) (const_int ...)) */ + const_value_attribute (rtl); + break; + + case MEM: + case REG: + case SUBREG: + location_attribute (rtl); + break; + + default: + abort (); /* Should never happen. */ + } +} + +/* Generate an AT_name attribute given some string value to be included as + the value of the attribute. If the name is null, don't do anything. */ + +inline void +name_attribute (name_string) + register char *name_string; +{ + if (name_string && *name_string) + { + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_name); + ASM_OUTPUT_DWARF_STRING (asm_out_file, name_string); + } +} + +inline void +fund_type_attribute (ft_code) + register unsigned ft_code; +{ + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_fund_type); + ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file, ft_code); +} + +static void +mod_fund_type_attribute (type, decl_const, decl_volatile) + register tree type; + register int decl_const; + register int decl_volatile; +{ + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_mod_fund_type); + sprintf (begin_label, MT_BEGIN_LABEL_FMT, current_dienum); + sprintf (end_label, MT_END_LABEL_FMT, current_dienum); + ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label); + ASM_OUTPUT_LABEL (asm_out_file, begin_label); + write_modifier_bytes (type, decl_const, decl_volatile); + ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file, + fundamental_type_code (root_type (type))); + ASM_OUTPUT_LABEL (asm_out_file, end_label); +} + +inline void +user_def_type_attribute (type) + register tree type; +{ + char ud_type_name[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_user_def_type); + sprintf (ud_type_name, TYPE_NAME_FMT, TYPE_UID (type)); + ASM_OUTPUT_DWARF_REF (asm_out_file, ud_type_name); +} + +static void +mod_u_d_type_attribute (type, decl_const, decl_volatile) + register tree type; + register int decl_const; + register int decl_volatile; +{ + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char ud_type_name[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_mod_u_d_type); + sprintf (begin_label, MT_BEGIN_LABEL_FMT, current_dienum); + sprintf (end_label, MT_END_LABEL_FMT, current_dienum); + ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label); + ASM_OUTPUT_LABEL (asm_out_file, begin_label); + write_modifier_bytes (type, decl_const, decl_volatile); + sprintf (ud_type_name, TYPE_NAME_FMT, TYPE_UID (root_type (type))); + ASM_OUTPUT_DWARF_REF (asm_out_file, ud_type_name); + ASM_OUTPUT_LABEL (asm_out_file, end_label); +} + +inline void +ordering_attribute (ordering) + register unsigned ordering; +{ + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_ordering); + ASM_OUTPUT_DWARF_DATA2 (asm_out_file, ordering); +} + +/* Note that the block of subscript information for an array type also + includes information about the element type of type given array type. */ + +static void +subscript_data_attribute (type) + register tree type; +{ + register unsigned dimension_number; + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_subscr_data); + sprintf (begin_label, SS_BEGIN_LABEL_FMT, current_dienum); + sprintf (end_label, SS_END_LABEL_FMT, current_dienum); + ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label); + ASM_OUTPUT_LABEL (asm_out_file, begin_label); + + /* The GNU compilers represent multidimensional array types as sequences + of one dimensional array types whose element types are themselves array + types. Here we squish that down, so that each multidimensional array + type gets only one array_type DIE in the Dwarf debugging info. The + draft Dwarf specification say that we are allowed to do this kind + of compression in C (because there is no difference between an + array or arrays and a multidimensional array in C) but for other + source languages (e.g. Ada) we probably shouldn't do this. */ + + for (dimension_number = 0; + TREE_CODE (type) == ARRAY_TYPE; + type = TREE_TYPE (type), dimension_number++) + { + register tree domain = TYPE_DOMAIN (type); + + /* Arrays come in three flavors. Unspecified bounds, fixed + bounds, and (in GNU C only) variable bounds. Handle all + three forms here. */ + + if (domain) + { + /* We have an array type with specified bounds. */ + + register tree lower = TYPE_MIN_VALUE (domain); + register tree upper = TYPE_MAX_VALUE (domain); + + /* Handle only fundamental types as index types for now. */ + + if (! type_is_fundamental (domain)) + abort (); + + /* Output the representation format byte for this dimension. */ + + ASM_OUTPUT_DWARF_FMT_BYTE (asm_out_file, + FMT_CODE (1, + TREE_CODE (lower) == INTEGER_CST, + TREE_CODE (upper) == INTEGER_CST)); + + /* Output the index type for this dimension. */ + + ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file, + fundamental_type_code (domain)); + + /* Output the representation for the lower bound. */ + + output_bound_representation (lower, dimension_number, 'l'); + + /* Output the representation for the upper bound. */ + + output_bound_representation (upper, dimension_number, 'u'); + } + else + { + /* We have an array type with an unspecified length. For C and + C++ we can assume that this really means that (a) the index + type is an integral type, and (b) the lower bound is zero. + Note that Dwarf defines the representation of an unspecified + (upper) bound as being a zero-length location description. */ + + /* Output the array-bounds format byte. */ + + ASM_OUTPUT_DWARF_FMT_BYTE (asm_out_file, FMT_FT_C_X); + + /* Output the (assumed) index type. */ + + ASM_OUTPUT_DWARF_FUND_TYPE (asm_out_file, FT_integer); + + /* Output the (assumed) lower bound (constant) value. */ + + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0); + + /* Output the (empty) location description for the upper bound. */ + + ASM_OUTPUT_DWARF_DATA2 (asm_out_file, 0); + } + } + + /* Output the prefix byte that says that the element type is comming up. */ + + ASM_OUTPUT_DWARF_FMT_BYTE (asm_out_file, FMT_ET); + + /* Output a representation of the type of the elements of this array type. */ + + type_attribute (type, 0, 0); + + ASM_OUTPUT_LABEL (asm_out_file, end_label); +} + +static void +byte_size_attribute (tree_node) + register tree tree_node; +{ + register unsigned size; + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_byte_size); + switch (TREE_CODE (tree_node)) + { + case ERROR_MARK: + size = 0; + break; + + case ENUMERAL_TYPE: + case RECORD_TYPE: + case UNION_TYPE: + size = int_size_in_bytes (tree_node); + break; + + case FIELD_DECL: + { + register unsigned words; + register unsigned bits; + + bits = TREE_INT_CST_LOW (DECL_SIZE (tree_node)); + words = (bits + (BITS_PER_WORD-1)) / BITS_PER_WORD; + size = words * (BITS_PER_WORD / BITS_PER_UNIT); + } + break; + + default: + abort (); + } + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, size); +} + +/* For a FIELD_DECL node which represents a bit field, output an attribute + which specifies the distance in bits from the start of the *word* + containing the given field to the first bit of the field. */ + +inline void +bit_offset_attribute (decl) + register tree decl; +{ + assert (TREE_CODE (decl) == FIELD_DECL); /* Must be a field. */ + assert (DECL_BIT_FIELD_TYPE (decl)); /* Must be a bit field. */ + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_bit_offset); + ASM_OUTPUT_DWARF_DATA2 (asm_out_file, + BITFIELD_OFFSET_BITS (decl) % (unsigned) BITS_PER_WORD); +} + +/* For a FIELD_DECL node which represents a bit field, output an attribute + which specifies the length in bits of the given field. */ + +inline void +bit_size_attribute (decl) + register tree decl; +{ + assert (TREE_CODE (decl) == FIELD_DECL); /* Must be a field. */ + assert (DECL_BIT_FIELD_TYPE (decl)); /* Must be a bit field. */ + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_bit_size); + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, + (unsigned) TREE_INT_CST_LOW (DECL_SIZE (decl))); +} + +/* The following routine outputs the `element_list' attribute for enumeration + type DIEs. The element_lits attribute includes the names and values of + all of the enumeration constants associated with the given enumeration + type. */ + +inline void +element_list_attribute (element) + register tree element; +{ + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_element_list); + sprintf (begin_label, EE_BEGIN_LABEL_FMT, current_dienum); + sprintf (end_label, EE_END_LABEL_FMT, current_dienum); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, end_label, begin_label); + ASM_OUTPUT_LABEL (asm_out_file, begin_label); + + /* Here we output a list of value/name pairs for each enumeration constant + defined for this enumeration type (as required), but we do it in REVERSE + order. The order is the one required by the draft #5 Dwarf specification + published by the UI/PLSIG. */ + + output_enumeral_list (element); /* Recursively output the whole list. */ + + ASM_OUTPUT_LABEL (asm_out_file, end_label); +} + +/* Generate an AT_stmt_list attribute. These are normally present only in + DIEs with a TAG_compile_unit tag. */ + +inline void +stmt_list_attribute (label) + register char *label; +{ + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_stmt_list); + /* Don't use ASM_OUTPUT_DWARF_DATA4 here. */ + ASM_OUTPUT_DWARF_ADDR (asm_out_file, label); +} + +/* Generate an AT_low_pc attribute for a label DIE, a lexical_block DIE or + for a subroutine DIE. */ + +inline void +low_pc_attribute (asm_low_label) + register char *asm_low_label; +{ + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_low_pc); + ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_low_label); +} + +/* Generate an AT_high_pc attribute for a lexical_block DIE or for a + subroutine DIE. */ + +inline void +high_pc_attribute (asm_high_label) + register char *asm_high_label; +{ + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_high_pc); + ASM_OUTPUT_DWARF_ADDR (asm_out_file, asm_high_label); +} + +/* Generate an AT_language attribute given a LANG value. These attributes + are used only within TAG_compile_unit DIEs. */ + +inline void +language_attribute (language_code) + register unsigned language_code; +{ + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_language); + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, language_code); +} + +inline void +member_attribute (context) + register tree context; +{ + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + /* Generate this attribute only for members in C++. */ + + if (context != NULL + && (TREE_CODE (context) == RECORD_TYPE + || TREE_CODE (context) == UNION_TYPE)) + { + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_member); + sprintf (label, TYPE_NAME_FMT, TYPE_UID (context)); + ASM_OUTPUT_DWARF_REF (asm_out_file, label); + } +} + +inline void +string_length_attribute (upper_bound) + register tree upper_bound; +{ + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_string_length); + sprintf (begin_label, SL_BEGIN_LABEL_FMT, current_dienum); + sprintf (end_label, SL_END_LABEL_FMT, current_dienum); + ASM_OUTPUT_DWARF_DELTA2 (asm_out_file, end_label, begin_label); + ASM_OUTPUT_LABEL (asm_out_file, begin_label); + output_bound_representation (upper_bound, 0, 'u'); + ASM_OUTPUT_LABEL (asm_out_file, end_label); +} + +inline void +comp_dir_attribute (dirname) + register char *dirname; +{ + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_comp_dir); + ASM_OUTPUT_DWARF_STRING (asm_out_file, dirname); +} + +inline void +sf_names_attribute (sf_names_start_label) + register char *sf_names_start_label; +{ + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_sf_names); + /* Don't use ASM_OUTPUT_DWARF_DATA4 here. */ + ASM_OUTPUT_DWARF_ADDR (asm_out_file, sf_names_start_label); +} + +inline void +src_info_attribute (src_info_start_label) + register char *src_info_start_label; +{ + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_src_info); + /* Don't use ASM_OUTPUT_DWARF_DATA4 here. */ + ASM_OUTPUT_DWARF_ADDR (asm_out_file, src_info_start_label); +} + +inline void +mac_info_attribute (mac_info_start_label) + register char *mac_info_start_label; +{ + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_mac_info); + /* Don't use ASM_OUTPUT_DWARF_DATA4 here. */ + ASM_OUTPUT_DWARF_ADDR (asm_out_file, mac_info_start_label); +} + +inline void +prototyped_attribute (func_type) + register tree func_type; +{ + if ((strcmp (language_string, "GNU C") == 0) + && (TYPE_ARG_TYPES (func_type) != NULL)) + { + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_prototyped); + ASM_OUTPUT_DWARF_STRING (asm_out_file, ""); + } +} + +inline void +producer_attribute (producer) + register char *producer; +{ + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_producer); + ASM_OUTPUT_DWARF_STRING (asm_out_file, producer); +} + +inline void +inline_attribute (decl) + register tree decl; +{ + if (TREE_INLINE (decl)) + { + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_inline); + ASM_OUTPUT_DWARF_STRING (asm_out_file, ""); + } +} + +inline void +containing_type_attribute (containing_type) + register tree containing_type; +{ + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_ATTRIBUTE (asm_out_file, AT_containing_type); + sprintf (label, TYPE_NAME_FMT, TYPE_UID (containing_type)); + ASM_OUTPUT_DWARF_REF (asm_out_file, label); +} + +/************************* end of attributes *****************************/ + +/********************* utility routines for DIEs *************************/ + +/* Many forms of DIEs contain a "type description" part. The following + routine writes out these "type descriptor" parts. */ + +static void +type_attribute (type, decl_const, decl_volatile) + register tree type; + register int decl_const; + register int decl_volatile; +{ + register enum tree_code code = TREE_CODE (type); + register int root_type_modified; + + if (TREE_CODE (type) == ERROR_MARK) + return; + + /* Handle a special case. For functions whose return type is void, + we generate *no* type attribute. (Note that no object may have + type `void', so this only applies to function return types. */ + + if (TREE_CODE (type) == VOID_TYPE) + return; + + root_type_modified = (code == POINTER_TYPE || code == REFERENCE_TYPE + || decl_const || decl_volatile + || TYPE_READONLY (type) || TYPE_VOLATILE (type)); + + if (type_is_fundamental (root_type (type))) + if (root_type_modified) + mod_fund_type_attribute (type, decl_const, decl_volatile); + else + fund_type_attribute (fundamental_type_code (type)); + else + if (root_type_modified) + mod_u_d_type_attribute (type, decl_const, decl_volatile); + else + user_def_type_attribute (type); +} + +/* Given a tree pointer to a struct, class, union, or enum type node, return + a pointer to the (string) tag name for the given type, or zero if the + type was declared without a tag. */ + +static char * +type_tag (type) + register tree type; +{ + register char *name = 0; + + if (TYPE_NAME (type) != 0) + { + register tree t = 0; + + /* Find the IDENTIFIER_NODE for the type name. */ + if (TREE_CODE (TYPE_NAME (type)) == IDENTIFIER_NODE) + t = TYPE_NAME (type); +#if 0 + /* The g++ front end makes the TYPE_NAME of *each* tagged type point + to a TYPE_DECL node, regardless of whether or not a `typedef' was + involved. This is distinctly different from what the gcc front-end + does. It always makes the TYPE_NAME for each tagged type be either + NULL (signifying an anonymous tagged type) or else a pointer to an + IDENTIFIER_NODE. Obviously, we would like to generate correct Dwarf + for both C and C++, but given this inconsistancy in the TREE + representation of tagged types for C and C++ in the GNU front-ends, + we cannot support both languages correctly unless we introduce some + front-end specific code here, and rms objects to that, so we can + only generate correct Dwarf for one of these two languages. C is + more important, so for now we'll do the right thing for C and let + g++ go fish. */ + + else + if (TREE_CODE (TYPE_NAME (type)) == TYPE_DECL) + t = DECL_NAME (TYPE_NAME (type)); +#endif + /* Now get the name as a string, or invent one. */ + if (t != 0) + name = IDENTIFIER_POINTER (t); + } + + return (name == 0 || *name == '\0') ? 0 : name; +} + +inline void +dienum_push () +{ + /* Start by checking if the pending_sibling_stack needs to be expanded. + If necessary, expand it. */ + + if (pending_siblings == pending_siblings_allocated) + { + pending_siblings_allocated += PENDING_SIBLINGS_INCREMENT; + pending_sibling_stack + = (unsigned *) xrealloc (pending_sibling_stack, + pending_siblings_allocated * sizeof(unsigned)); + } + + pending_siblings++; + NEXT_DIE_NUM = next_unused_dienum++; +} + +/* Pop the sibling stack so that the most recently pushed DIEnum becomes the + NEXT_DIE_NUM. */ + +inline void +dienum_pop () +{ + pending_siblings--; +} + +inline tree +member_declared_type (member) + register tree member; +{ + return (DECL_BIT_FIELD_TYPE (member)) + ? DECL_BIT_FIELD_TYPE (member) + : TREE_TYPE (member); +} + +/******************************* DIEs ************************************/ + +/* Output routines for individual types of DIEs. */ + +/* Note that every type of DIE (except a null DIE) gets a sibling. */ + +static void +output_array_type_die (arg) + register void *arg; +{ + register tree type = arg; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_array_type); + sibling_attribute (); + equate_type_number_to_die_number (type); + member_attribute (TYPE_CONTEXT (type)); + + /* I believe that we can default the array ordering. SDB will probably + do the right things even if AT_ordering is not present. It's not + even an issue until we start to get into multidimensional arrays + anyway. If SDB is shown to do the wrong thing in those cases, then + we'll have to put the AT_ordering attribute back in, but only for + multidimensional array. (After all, we don't want to waste space + in the .debug section now do we?) */ + +#if 0 + ordering_attribute (ORD_row_major); +#endif + + subscript_data_attribute (type); +} + +static void +output_set_type_die (arg) + register void *arg; +{ + register tree type = arg; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_set_type); + sibling_attribute (); + equate_type_number_to_die_number (type); + member_attribute (TYPE_CONTEXT (type)); + type_attribute (TREE_TYPE (type), 0, 0); +} + +#if 0 +/* Implement this when there is a GNU FORTRAN or GNU Ada front end. */ +static void +output_entry_point_die (arg) + register void *arg; +{ + register tree decl = arg; + register tree type = TREE_TYPE (decl); + register tree return_type = TREE_TYPE (type); + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_entry_point); + sibling_attribute (); + dienum_push (); + if (DECL_NAME (decl)) + name_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + member_attribute (DECL_CONTEXT (decl)); + type_attribute (return_type, 0, 0); +} +#endif + +/* Output a DIE to represent an enumeration type. Note that these DIEs + include all of the information about the enumeration values also. + This information is encoded into the element_list attribute. */ + +static void +output_enumeration_type_die (arg) + register void *arg; +{ + register tree type = arg; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_enumeration_type); + sibling_attribute (); + equate_type_number_to_die_number (type); + name_attribute (type_tag (type)); + member_attribute (TYPE_CONTEXT (type)); + + /* Handle a GNU C/C++ extension, i.e. incomplete enum types. If the + given enum type is incomplete, do not generate the AT_byte_size + attribute or the AT_element_list attribute. */ + + if (TYPE_SIZE (type)) + { + byte_size_attribute (type); + element_list_attribute (TYPE_FIELDS (type)); + } +} + +/* Output a DIE to represent either a real live formal parameter decl or + to represent just the type of some formal parameter position in some + function type. + + Note that this routine is a bit unusual because its argument may be + either a PARM_DECL node or else some sort of a ..._TYPE node. If it's + the formar then this function is being called to output a real live + formal parameter declaration. If it's the latter, then this function + is only being called to output a TAG_formal_parameter DIE to stand as + a placeholder for some formal argument type of some subprogram type. */ + +static void +output_formal_parameter_die (arg) + register void *arg; +{ + register tree decl = arg; + register tree type; + + if (TREE_CODE (decl) == PARM_DECL) + type = TREE_TYPE (decl); + else + { + type = decl; /* we were called with a type, not a decl */ + decl = NULL; + } + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_formal_parameter); + sibling_attribute (); + if (decl) + { + if (DECL_NAME (decl)) + name_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + type_attribute (type, TREE_READONLY (decl), TREE_THIS_VOLATILE (decl)); + location_or_const_value_attribute (decl); + } + else + type_attribute (type, 0, 0); +} + +/* Output a DIE to represent a declared function (either file-scope + or block-local) which has "external linkage" (according to ANSI-C). */ + +static void +output_global_subroutine_die (arg) + register void *arg; +{ + register tree decl = arg; + register tree type = TREE_TYPE (decl); + register tree return_type = TREE_TYPE (type); + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_global_subroutine); + sibling_attribute (); + dienum_push (); + if (DECL_NAME (decl)) + name_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + inline_attribute (decl); + prototyped_attribute (type); + member_attribute (DECL_CONTEXT (decl)); + type_attribute (return_type, 0, 0); + if (!TREE_EXTERNAL (decl)) + { + char func_end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + low_pc_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + sprintf (func_end_label, FUNC_END_LABEL_FMT, current_funcdef_number); + high_pc_attribute (func_end_label); + } +} + +/* Output a DIE to represent a declared data object (either file-scope + or block-local) which has "external linkage" (according to ANSI-C). */ + +static void +output_global_variable_die (arg) + register void *arg; +{ + register tree decl = arg; + register tree type = TREE_TYPE (decl); + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_global_variable); + sibling_attribute (); + if (DECL_NAME (decl)) + name_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + member_attribute (DECL_CONTEXT (decl)); + type_attribute (type, TREE_READONLY (decl), TREE_THIS_VOLATILE (decl)); + if (!TREE_EXTERNAL (decl)) + location_or_const_value_attribute (decl); +} + +#if 0 +/* TAG_inline_subroutine has been retired by the UI/PLSIG. We're + now supposed to use either TAG_subroutine or TAG_global_subroutine + (depending on whether or not the function in question has internal + or external linkage) and we're supposed to just put in an AT_inline + attribute. */ +static void +output_inline_subroutine_die (arg) + register void *arg; +{ + register tree decl = arg; + register tree type = TREE_TYPE (decl); + register tree return_type = TREE_TYPE (type); + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_inline_subroutine); + sibling_attribute (); + dienum_push (); + if (DECL_NAME (decl)) + name_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + prototyped_attribute (type); + member_attribute (DECL_CONTEXT (decl)); + type_attribute (return_type, 0, 0); + + /* Note: For each inline function which gets an out-of-line body + generated for it, we want to generate AT_low_pc and AT_high_pc + attributes here for the function's out-of-line body. + + Unfortunately, the decision as to whether or not to generate an + out-of-line body for any given inline function may not be made + until we reach the end of the containing scope for the given + inline function (because only then will it be known if the + function was ever even called). + + For this reason, the output of DIEs representing file-scope inline + functions gets delayed until a special post-pass which happens only + after we have reached the end of the compilation unit. Because of + this mechanism, we can always be sure (by the time we reach here) + that TREE_ASM_WRITTEN(decl) will correctly indicate whether or not + there was an out-of-line body generated for this inline function. + */ + + if (!TREE_EXTERNAL (decl)) + { + if (TREE_ASM_WRITTEN (decl)) + { + char func_end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + low_pc_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + sprintf (func_end_label, FUNC_END_LABEL_FMT, current_funcdef_number); + high_pc_attribute (func_end_label); + } + } +} +#endif + +static void +output_label_die (arg) + register void *arg; +{ + register tree decl = arg; + register rtx insn = DECL_RTL (decl); + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_label); + sibling_attribute (); + name_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + + /* When optimization is enabled (with -O) the code in jump.c and in flow.c + may cause insns representing one of more of the user's own labels to + be deleted. This happens whenever it is determined that a given label + is unreachable. + + In such cases, we here generate an abbreviated form of a label DIE. + This abbreviated version does *not* have a low_pc attribute. This + should signify to the debugger that the label has been optimized away. + + Note that a CODE_LABEL can get deleted either by begin converted into + a NOTE_INSN_DELETED note, or by simply having its INSN_DELETED_P flag + set to true. We handle both cases here. + */ + + if (GET_CODE (insn) == CODE_LABEL && ! INSN_DELETED_P (insn)) + { + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + sprintf (label, INSN_LABEL_FMT, current_funcdef_number, + (unsigned) INSN_UID (insn)); + low_pc_attribute (label); + } +} + +static void +output_lexical_block_die (arg) + register void *arg; +{ + register tree stmt = arg; + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_lexical_block); + sibling_attribute (); + dienum_push (); + sprintf (begin_label, BLOCK_BEGIN_LABEL_FMT, next_block_number); + low_pc_attribute (begin_label); + sprintf (end_label, BLOCK_END_LABEL_FMT, next_block_number); + high_pc_attribute (end_label); +} + +static void +output_inlined_subroutine_die (arg) + register void *arg; +{ + register tree stmt = arg; + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_inlined_subroutine); + sibling_attribute (); + dienum_push (); + sprintf (begin_label, BLOCK_BEGIN_LABEL_FMT, next_block_number); + low_pc_attribute (begin_label); + sprintf (end_label, BLOCK_END_LABEL_FMT, next_block_number); + high_pc_attribute (end_label); +} + +/* Output a DIE to represent a declared data object (either file-scope + or block-local) which has "internal linkage" (according to ANSI-C). */ + +static void +output_local_variable_die (arg) + register void *arg; +{ + register tree decl = arg; + register tree type = TREE_TYPE (decl); + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_local_variable); + sibling_attribute (); + if (DECL_NAME (decl)) + name_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + member_attribute (DECL_CONTEXT (decl)); + type_attribute (type, TREE_READONLY (decl), TREE_THIS_VOLATILE (decl)); + location_or_const_value_attribute (decl); +} + +static void +output_member_die (arg) + register void *arg; +{ + register tree decl = arg; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_member); + sibling_attribute (); + if (DECL_NAME (decl)) + name_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + member_attribute (DECL_CONTEXT (decl)); + type_attribute (member_declared_type (decl), + TREE_READONLY (decl), TREE_THIS_VOLATILE (decl)); + if (DECL_BIT_FIELD_TYPE (decl)) /* If this is a bit field... */ + { + byte_size_attribute (decl); + bit_size_attribute (decl); + bit_offset_attribute (decl); + } + data_member_location_attribute (decl); +} + +#if 0 +/* Don't generate either pointer_type DIEs or reference_type DIEs. According + to the 4-4-90 Dwarf draft spec (just after requirement #47): + + These two type entries are not currently generated by any compiler. + Since the only way to name a pointer (or reference) type is C or C++ + is via a "typedef", an entry with the "typedef" tag is generated + instead. + + We keep this code here just in case these types of DIEs may be needed + to represent certain things in other languages (e.g. Pascal) someday. +*/ + +static void +output_pointer_type_die (arg) + register void *arg; +{ + register tree type = arg; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_pointer_type); + sibling_attribute (); + equate_type_number_to_die_number (type); + member_attribute (TYPE_CONTEXT (type)); + type_attribute (TREE_TYPE (type), 0, 0); +} + +static void +output_reference_type_die (arg) + register void *arg; +{ + register tree type = arg; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_reference_type); + sibling_attribute (); + equate_type_number_to_die_number (type); + member_attribute (TYPE_CONTEXT (type)); + type_attribute (TREE_TYPE (type), 0, 0); +} +#endif + +output_ptr_to_mbr_type_die (arg) + register void *arg; +{ + register tree type = arg; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_ptr_to_member_type); + sibling_attribute (); + equate_type_number_to_die_number (type); + member_attribute (TYPE_CONTEXT (type)); + containing_type_attribute (TYPE_OFFSET_BASETYPE (type)); + type_attribute (TREE_TYPE (type), 0, 0); +} + +static void +output_compile_unit_die (arg) + register void *arg; +{ + register char *main_input_filename = arg; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_compile_unit); + sibling_attribute (); + dienum_push (); + name_attribute (main_input_filename); + + { + char producer[250]; + + sprintf (producer, "%s %s", language_string, version_string); + producer_attribute (producer); + } + + if (strcmp (language_string, "GNU C++") == 0) + language_attribute (LANG_C_PLUS_PLUS); + else if (flag_traditional) + language_attribute (LANG_C); + else + language_attribute (LANG_C89); + low_pc_attribute (TEXT_BEGIN_LABEL); + high_pc_attribute (TEXT_END_LABEL); + if (debug_info_level >= DINFO_LEVEL_NORMAL) + stmt_list_attribute (LINE_BEGIN_LABEL); + last_filename = xstrdup (main_input_filename); + + { + register unsigned len = 1024; + register char *dirname = (char *) xmalloc (len + 1); + + /* We don't know how much space the dirname needs, + so try bigger and bigger buffers until it fits. */ + while (1) + { + getcwd (dirname, len); /* Being conservative here. */ + if (strlen (dirname) < len - 1) /* Being conservative here. */ + break; + len *= 2; + dirname = (char *) xrealloc (dirname, len + 1); + } + + comp_dir_attribute (dirname); + free (dirname); + } + + if (debug_info_level >= DINFO_LEVEL_NORMAL) + { + sf_names_attribute (SFNAMES_BEGIN_LABEL); + src_info_attribute (SRCINFO_BEGIN_LABEL); + if (debug_info_level >= DINFO_LEVEL_VERBOSE) + mac_info_attribute (MACINFO_BEGIN_LABEL); + } +} + +static void +output_string_type_die (arg) + register void *arg; +{ + register tree type = arg; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_string_type); + sibling_attribute (); + member_attribute (TYPE_CONTEXT (type)); + + /* Fudge the string length attribute for now. */ + + string_length_attribute ( + TYPE_MAX_VALUE (TYPE_DOMAIN (type))); +} + +static void +output_structure_type_die (arg) + register void *arg; +{ + register tree type = arg; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_structure_type); + sibling_attribute (); + equate_type_number_to_die_number (type); + name_attribute (type_tag (type)); + member_attribute (TYPE_CONTEXT (type)); + + /* If this type has been completed, then give it a byte_size attribute + and prepare to give a list of members. Otherwise, don't do either of + these things. In the latter case, we will not be generating a list + of members (since we don't have any idea what they might be for an + incomplete type). */ + + if (TYPE_SIZE (type)) + { + dienum_push (); + byte_size_attribute (type); + } +} + +/* Output a DIE to represent a declared function (either file-scope + or block-local) which has "internal linkage" (according to ANSI-C). */ + +static void +output_local_subroutine_die (arg) + register void *arg; +{ + register tree decl = arg; + register tree type = TREE_TYPE (decl); + register tree return_type = TREE_TYPE (type); + char func_end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_subroutine); + sibling_attribute (); + dienum_push (); + if (DECL_NAME (decl)) + name_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + inline_attribute (decl); + prototyped_attribute (type); + member_attribute (DECL_CONTEXT (decl)); + type_attribute (return_type, 0, 0); + + /* Avoid getting screwed up in cases where a function was declared static + but where no definition was ever given for it. */ + + if (TREE_ASM_WRITTEN (decl)) + { + low_pc_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + sprintf (func_end_label, FUNC_END_LABEL_FMT, current_funcdef_number); + high_pc_attribute (func_end_label); + } +} + +static void +output_subroutine_type_die (arg) + register void *arg; +{ + register tree type = arg; + register tree return_type = TREE_TYPE (type); + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_subroutine_type); + sibling_attribute (); + dienum_push (); + equate_type_number_to_die_number (type); + prototyped_attribute (type); + member_attribute (TYPE_CONTEXT (type)); + type_attribute (return_type, 0, 0); +} + +static void +output_typedef_die (arg) + register void *arg; +{ + register tree decl = arg; + register tree type = TREE_TYPE (decl); + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_typedef); + sibling_attribute (); + if (DECL_NAME (decl)) + name_attribute (IDENTIFIER_POINTER (DECL_NAME (decl))); + member_attribute (DECL_CONTEXT (decl)); + type_attribute (type, TREE_READONLY (decl), TREE_THIS_VOLATILE (decl)); +} + +static void +output_union_type_die (arg) + register void *arg; +{ + register tree type = arg; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_union_type); + sibling_attribute (); + equate_type_number_to_die_number (type); + name_attribute (type_tag (type)); + member_attribute (TYPE_CONTEXT (type)); + + /* If this type has been completed, then give it a byte_size attribute + and prepare to give a list of members. Otherwise, don't do either of + these things. In the latter case, we will not be generating a list + of members (since we don't have any idea what they might be for an + incomplete type). */ + + if (TYPE_SIZE (type)) + { + dienum_push (); + byte_size_attribute (type); + } +} + +/* Generate a special type of DIE used as a stand-in for a trailing ellipsis + at the end of an (ANSI prototyped) formal parameters list. */ + +static void +output_unspecified_parameters_die (arg) + register void *arg; +{ + register tree decl_or_type = arg; + + ASM_OUTPUT_DWARF_TAG (asm_out_file, TAG_unspecified_parameters); + sibling_attribute (); + + /* This kludge is here only for the sake of being compatible with what + the USL CI5 C compiler does. The specification of Dwarf Version 1 + doesn't say that TAG_unspecified_parameters DIEs should contain any + attributes other than the AT_sibling attribute, but they are certainly + allowed to contain additional attributes, and the CI5 compiler + generates AT_name, AT_fund_type, and AT_location attributes within + TAG_unspecified_parameters DIEs which appear in the child lists for + DIEs representing function definitions, so we do likewise here. */ + + if (TREE_CODE (decl_or_type) == FUNCTION_DECL && DECL_INITIAL (decl_or_type)) + { + name_attribute ("..."); + fund_type_attribute (FT_pointer); + /* location_attribute (?); */ + } +} + +static void +output_padded_null_die (arg) + register void *arg; +{ + ASM_OUTPUT_ALIGN (asm_out_file, 2); /* 2**2 == 4 */ +} + +/*************************** end of DIEs *********************************/ + +/* Generate some type of DIE. This routine generates the generic outer + wrapper stuff which goes around all types of DIE's (regardless of their + TAGs. All forms of DIEs start with a DIE-specific label, followed by a + DIE-length word, followed by the guts of the DIE itself. After the guts + of the DIE, there must always be a terminator label for the DIE. */ + +static void +output_die (die_specific_output_function, param) + register void (*die_specific_output_function)(); + register void *param; +{ + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + char end_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + current_dienum = NEXT_DIE_NUM; + NEXT_DIE_NUM = next_unused_dienum; + + sprintf (begin_label, DIE_BEGIN_LABEL_FMT, current_dienum); + sprintf (end_label, DIE_END_LABEL_FMT, current_dienum); + + /* Write a label which will act as the name for the start of this DIE. */ + + ASM_OUTPUT_LABEL (asm_out_file, begin_label); + + /* Write the DIE-length word. */ + + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, end_label, begin_label); + + /* Fill in the guts of the DIE. */ + + next_unused_dienum++; + die_specific_output_function (param); + + /* Write a label which will act as the name for the end of this DIE. */ + + ASM_OUTPUT_LABEL (asm_out_file, end_label); +} + +static void +end_sibling_chain () +{ + char begin_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + current_dienum = NEXT_DIE_NUM; + NEXT_DIE_NUM = next_unused_dienum; + + sprintf (begin_label, DIE_BEGIN_LABEL_FMT, current_dienum); + + /* Write a label which will act as the name for the start of this DIE. */ + + ASM_OUTPUT_LABEL (asm_out_file, begin_label); + + /* Write the DIE-length word. */ + + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 4); + + dienum_pop (); +} + +/* Generate a list of nameless TAG_formal_parameter DIEs (and perhaps a + TAG_unspecified_parameters DIE) to represent the types of the formal + parameters as specified in some function type specification (except + for those which appear as part of a function *definition*). + + Note that we must be careful here to output all of the parameter DIEs + *before* we output any DIEs needed to represent the types of the formal + parameters. This keeps svr4 SDB happy because it (incorrectly) thinks + that the first non-parameter DIE it sees ends the formal parameter list. +*/ + +static void +output_formal_types (function_or_method_type) + register tree function_or_method_type; +{ + register tree link; + register tree formal_type; + register tree first_parm_type = TYPE_ARG_TYPES (function_or_method_type); + + /* In the case where we are generating a formal types list for a C++ + non-static member function type, skip over the first thing on the + TYPE_ARG_TYPES list because it only represents the type of the + hidden `this pointer'. The debugger should be able to figure + out (without being explicitly told) that this non-static member + function type takes a `this pointer' and should be able to figure + what the type of that hidden parameter is from the AT_member + attribute of the parent TAG_subroutine_type DIE. */ + + if (TREE_CODE (function_or_method_type) == METHOD_TYPE) + first_parm_type = TREE_CHAIN (first_parm_type); + + /* Make our first pass over the list of formal parameter types and output + a TAG_formal_parameter DIE for each one. */ + + for (link = first_parm_type; link; link = TREE_CHAIN (link)) + { + formal_type = TREE_VALUE (link); + if (formal_type == void_type_node) + break; + + /* Output a (nameless) DIE to represent the formal parameter itself. */ + + output_die (output_formal_parameter_die, formal_type); + } + + /* If this function type has an ellipsis, add a TAG_unspecified_parameters + DIE to the end of the parameter list. */ + + if (formal_type != void_type_node) + output_die (output_unspecified_parameters_die, function_or_method_type); + + /* Make our second (and final) pass over the list of formal parameter types + and output DIEs to represent those types (as necessary). */ + + for (link = TYPE_ARG_TYPES (function_or_method_type); + link; + link = TREE_CHAIN (link)) + { + formal_type = TREE_VALUE (link); + if (formal_type == void_type_node) + break; + + output_type (formal_type, function_or_method_type); + } +} + +/* Remember a type in the pending_types_list. */ + +static void +pend_type (type) + register tree type; +{ + if (pending_types == pending_types_allocated) + { + pending_types_allocated += PENDING_TYPES_INCREMENT; + pending_types_list + = (tree *) xrealloc (pending_types_list, + sizeof (tree) * pending_types_allocated); + } + pending_types_list[pending_types++] = type; + + /* Mark the pending type as having been output already (even though + it hasn't been). This prevents the type from being added to the + pending_types_list more than once. */ + + TREE_ASM_WRITTEN (type) = 1; +} + +/* Return non-zero if it is legitimate to output DIEs to represent a + given type while we are generating the list of child DIEs for some + DIE associated with a given scope. + + This function returns non-zero if *either* of the following two conditions + is satisfied: + + o the type actually belongs to the given scope (as evidenced + by its TYPE_CONTEXT value), or + + o the type is anonymous, and the `scope' in question is *not* + a RECORD_TYPE or UNION_TYPE. + + In theory, we should be able to generate DIEs for anonymous types + *anywhere* (since the scope of an anonymous type is irrelevant) + however svr4 SDB doesn't want to see other type DIEs within the + lists of child DIEs for a TAG_structure_type or TAG_union_type DIE. + + Note that TYPE_CONTEXT(type) may be NULL (to indicate global scope) + or it may point to a BLOCK node (for types local to a block), or to a + FUNCTION_DECL node (for types local to the heading of some function + definition), or to a FUNCTION_TYPE node (for types local to the + prototyped parameter list of a function type specification), or to a + RECORD_TYPE or UNION_TYPE node (in the case of C++ nested types). + + The `scope' parameter should likewise be NULL or should point to a + BLOCK node, a FUNCTION_DECL node, a FUNCTION_TYPE node, a RECORD_TYPE + node, or a UNION_TYPE node. + + This function is used only for deciding when to "pend" and when to + "un-pend" types to/from the pending_types_list. + + Note that we sometimes make use of this "type pending" feature in a + rather twisted way to temporarily delay the production of DIEs for the + types of formal parameters. (We do this just to make svr4 SDB happy.) + It order to delay the production of DIEs representing types of formal + parameters, callers of this function supply `fake_containing_scope' as + the `scope' parameter to this function. Given that fake_containing_scope + is *not* the containing scope for *any* other type, the desired effect + is achieved, i.e. output of DIEs representing types is temporarily + suspended, and any type DIEs which would have been output otherwise + are instead placed onto the pending_types_list. Later on, we can force + these (temporarily pended) types to be output simply by calling + `output_pending_types_for_scope' with an actual argument equal to the + true scope of the types we temporarily pended. +*/ + +static int +type_ok_for_scope (type, scope) + register tree type; + register tree scope; +{ + return (TYPE_CONTEXT (type) == scope + || (TYPE_NAME (type) == NULL + && TREE_CODE (scope) != RECORD_TYPE + && TREE_CODE (scope) != UNION_TYPE)); +} + +/* Output any pending types (from the pending_types list) which we can output + now (given the limitations of the scope that we are working on now). + + For each type output, remove the given type from the pending_types_list + *before* we try to output it. + + Note that we have to process the list in beginning-to-end order, + because the call made here to output_type may cause yet more types + to be added to the end of the list, and we may have to output some + of them too. +*/ + +static void +output_pending_types_for_scope (containing_scope) + register tree containing_scope; +{ + register unsigned i; + + for (i = 0; i < pending_types; ) + { + register tree type = pending_types_list[i]; + + if (type_ok_for_scope (type, containing_scope)) + { + register tree *mover; + register tree *limit; + + pending_types--; + limit = &pending_types_list[pending_types]; + for (mover = &pending_types_list[i]; mover < limit; mover++) + *mover = *(mover+1); + + /* Un-mark the type as having been output already (because it + hasn't been, really). Then call output_type to generate a + Dwarf representation of it. */ + + TREE_ASM_WRITTEN (type) = 0; + output_type (type, containing_scope); + + /* Don't increment the loop counter in this case because we + have shifted all of the subsequent pending types down one + element in the pending_types_list array. */ + } + else + i++; + } +} + +static void +output_type (type, containing_scope) + register tree type; + register tree containing_scope; +{ + if (type == 0 || type == error_mark_node) + return; + + /* We are going to output a DIE to represent the unqualified version of + of this type (i.e. without any const or volatile qualifiers) so get + the main variant (i.e. the unqualified version) of this type now. */ + + type = TYPE_MAIN_VARIANT (type); + + if (TREE_ASM_WRITTEN (type)) + return; + + /* Don't generate any DIEs for this type now unless it is OK to do so + (based upon what `type_ok_for_scope' tells us). */ + + if (! type_ok_for_scope (type, containing_scope)) + { + pend_type (type); + return; + } + + switch (TREE_CODE (type)) + { + case ERROR_MARK: + break; + + case POINTER_TYPE: + case REFERENCE_TYPE: + /* For these types, all that is required is that we output a DIE + (or a set of DIEs) to represent that "basis" type. */ + output_type (TREE_TYPE (type), containing_scope); + break; + + case OFFSET_TYPE: + /* This code is used for C++ pointer-to-data-member types. */ + /* Output a description of the relevant class type. */ + output_type (TYPE_OFFSET_BASETYPE (type), containing_scope); + /* Output a description of the type of the object pointed to. */ + output_type (TREE_TYPE (type), containing_scope); + /* Now output a DIE to represent this pointer-to-data-member type + itself. */ + output_die (output_ptr_to_mbr_type_die, type); + break; + + case SET_TYPE: + output_type (TREE_TYPE (type), containing_scope); + output_die (output_set_type_die, type); + break; + + case FILE_TYPE: + output_type (TREE_TYPE (type), containing_scope); + abort (); /* No way to reprsent these in Dwarf yet! */ + break; + + case STRING_TYPE: + output_type (TREE_TYPE (type), containing_scope); + output_die (output_string_type_die, type); + break; + + case FUNCTION_TYPE: + /* Force out return type (in case it wasn't forced out already). */ + output_type (TREE_TYPE (type), containing_scope); + output_die (output_subroutine_type_die, type); + output_formal_types (type); + end_sibling_chain (); + break; + + case METHOD_TYPE: + /* Force out return type (in case it wasn't forced out already). */ + output_type (TREE_TYPE (type), containing_scope); + output_die (output_subroutine_type_die, type); + output_formal_types (type); + end_sibling_chain (); + break; + + case ARRAY_TYPE: + { + register tree element_type; + + element_type = TREE_TYPE (type); + while (TREE_CODE (element_type) == ARRAY_TYPE) + element_type = TREE_TYPE (element_type); + + output_type (element_type, containing_scope); + output_die (output_array_type_die, type); + } + break; + + case ENUMERAL_TYPE: + case RECORD_TYPE: + case UNION_TYPE: + + /* For a non-file-scope tagged type, we can always go ahead and + output a Dwarf description of this type right now, even if + the type in question is still incomplete, because if this + local type *was* ever completed anywhere within its scope, + that complete definition would already have been attached to + this RECORD_TYPE, UNION_TYPE or ENUMERAL_TYPE node by the + time we reach this point. That's true because of the way the + front-end does its processing of file-scope declarations (of + functions and class types) within which other types might be + nested. The C and C++ front-ends always gobble up such "local + scope" things en-mass before they try to output *any* debugging + information for any of the stuff contained inside them and thus, + we get the benefit here of what is (in effect) a pre-resolution + of forward references to tagged types in local scopes. + + Note however that for file-scope tagged types we cannot assume + that such pre-resolution of forward references has taken place. + A given file-scope tagged type may appear to be incomplete when + we reach this point, but it may yet be given a full definition + (at file-scope) later on during compilation. In order to avoid + generating a premature (and possibly incorrect) set of Dwarf + DIEs for such (as yet incomplete) file-scope tagged types, we + generate nothing at all for as-yet incomplete file-scope tagged + types here unless we are making our special "finalization" pass + for file-scope things at the very end of compilation. At that + time, we will certainly know as much about each file-scope tagged + type as we are ever going to know, so at that point in time, we + can safely generate correct Dwarf descriptions for these file- + scope tagged types. + */ + + if (TYPE_SIZE (type) == 0 && TYPE_CONTEXT (type) == NULL && !finalizing) + return; /* EARLY EXIT! Avoid setting TREE_ASM_WRITTEN. */ + + /* Prevent infinite recursion in cases where the type of some + member of this type is expressed in terms of this type itself. */ + + TREE_ASM_WRITTEN (type) = 1; + + /* Output a DIE to represent the tagged type itself. */ + + switch (TREE_CODE (type)) + { + case ENUMERAL_TYPE: + output_die (output_enumeration_type_die, type); + return; /* a special case -- nothing left to do so just return */ + + case RECORD_TYPE: + output_die (output_structure_type_die, type); + break; + + case UNION_TYPE: + output_die (output_union_type_die, type); + break; + } + + /* If this is not an incomplete type, output descriptions of + each of its members. + + Note that as we output the DIEs necessary to represent the + members of this record or union type, we will also be trying + to output DIEs to represent the *types* of those members. + However the `output_type' function (above) will specifically + avoid generating type DIEs for member types *within* the list + of member DIEs for this (containing) type execpt for those + types (of members) which are explicitly marked as also being + members of this (containing) type themselves. The g++ front- + end can force any given type to be treated as a member of some + other (containing) type by setting the TYPE_CONTEXT of the + given (member) type to point to the TREE node representing the + appropriate (containing) type. + */ + + if (TYPE_SIZE (type)) + { + register tree member; + + /* First output info about the data members and type members. */ + + for (member = TYPE_FIELDS (type); + member; + member = TREE_CHAIN (member)) + output_decl (member, type); + + /* Now output info about the function members (if any). */ + + if (TYPE_METHODS (type)) + for (member = TREE_VEC_ELT (TYPE_METHODS (type), 0); + member; + member = TREE_CHAIN (member)) + output_decl (member, type); + + end_sibling_chain (); /* Terminate member chain. */ + } + + break; + + case VOID_TYPE: + case INTEGER_TYPE: + case REAL_TYPE: + case COMPLEX_TYPE: + case BOOLEAN_TYPE: + case CHAR_TYPE: + break; /* No DIEs needed for fundamental types. */ + + case LANG_TYPE: /* No Dwarf representation currently defined. */ + break; + + default: + abort (); + } + + TREE_ASM_WRITTEN (type) = 1; +} + +/* Output a TAG_lexical_block DIE followed by DIEs to represent all of + the things which are local to the given block. */ + +static void +output_block (stmt) + register tree stmt; +{ + register int have_significant_locals = 0; + + /* Ignore blocks never really used to make RTL. */ + + if (! stmt || ! TREE_USED (stmt)) + return; + + /* Determine if this block contains any "significant" local declarations + which we need to output DIEs for. */ + + if (BLOCK_INLINE_FUNCTION (stmt)) + /* The outer scopes for inlinings *must* always be represented. */ + have_significant_locals = 1; + else + if (debug_info_level > DINFO_LEVEL_TERSE) + have_significant_locals = (BLOCK_VARS (stmt) != NULL); + else + { + register tree decl; + + for (decl = BLOCK_VARS (stmt); decl; decl = TREE_CHAIN (decl)) + if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl)) + { + have_significant_locals = 1; + break; + } + } + + /* It would be a waste of space to generate a Dwarf TAG_lexical_block + DIE for any block which contains no significant local declarations + at all. Rather, in such cases we just call `output_decls_for_scope' + so that any needed Dwarf info for any sub-blocks will get properly + generated. Note that in terse mode, our definition of what constitutes + a "significant" local declaration gets restricted to include only + inlined function instances and local (nested) function definitions. */ + + if (have_significant_locals) + { + output_die (BLOCK_INLINE_FUNCTION (stmt) + ? output_inlined_subroutine_die + : output_lexical_block_die, + stmt); + output_decls_for_scope (stmt); + end_sibling_chain (); + } + else + output_decls_for_scope (stmt); +} + +/* Output all of the decls declared within a given scope (also called + a `binding contour') and (recursively) all of it's sub-blocks. */ + +static void +output_decls_for_scope (stmt) + register tree stmt; +{ + /* Ignore blocks never really used to make RTL. */ + + if (! stmt || ! TREE_USED (stmt)) + return; + + next_block_number++; + + /* Output the DIEs to represent all of the data objects, functions, + typedefs, and tagged types declared directly within this block + but not within any nested sub-blocks. */ + + { + register tree decl; + + for (decl = BLOCK_VARS (stmt); decl; decl = TREE_CHAIN (decl)) + output_decl (decl, stmt); + } + + output_pending_types_for_scope (stmt); + + /* Output the DIEs to represent all sub-blocks (and the items declared + therein) of this block. */ + + { + register tree subblocks; + + for (subblocks = BLOCK_SUBBLOCKS (stmt); + subblocks; + subblocks = BLOCK_CHAIN (subblocks)) + output_block (subblocks); + } +} + +/* Output Dwarf .debug information for a decl described by DECL. */ + +static void +output_decl (decl, containing_scope) + register tree decl; + register tree containing_scope; +{ + switch (TREE_CODE (decl)) + { + case ERROR_MARK: + break; + + case CONST_DECL: + /* The individual enumerators of an enum type get output when we + output the Dwarf representation of the relevant enum type itself. */ + break; + + case FUNCTION_DECL: + /* If we are in terse mode, don't output any DIEs to represent + mere external function declarations. */ + + if (TREE_EXTERNAL (decl) && debug_info_level <= DINFO_LEVEL_TERSE) + break; + + /* Before we describe the FUNCTION_DECL itself, make sure that we + have described its return type. */ + + output_type (TREE_TYPE (TREE_TYPE (decl)), containing_scope); + + /* If the following DIE will represent a function definition for a + function with "extern" linkage, output a special "pubnames" DIE + label just ahead of the actual DIE. A reference to this label + was already generated in the .debug_pubnames section sub-entry + for this function definition. */ + + if (TREE_PUBLIC (decl)) + { + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + sprintf (label, PUB_DIE_LABEL_FMT, next_pubname_number++); + ASM_OUTPUT_LABEL (asm_out_file, label); + } + + /* Now output a DIE to represent the function itself. */ + + output_die (TREE_PUBLIC (decl) || TREE_EXTERNAL (decl) + ? output_global_subroutine_die + : output_local_subroutine_die, + decl); + + /* Now output descriptions of the arguments for this function. + This gets (unnecessarily?) complex because of the fact that + the DECL_ARGUMENT list for a FUNCTION_DECL doesn't indicate + cases where there was a trailing `...' at the end of the formal + parameter list. In order to find out if there was a trailing + ellipsis or not, we must instead look at the type associated + with the FUNCTION_DECL. This will be a node of type FUNCTION_TYPE. + If the chain of type nodes hanging off of this FUNCTION_TYPE node + ends with a void_type_node then there should *not* be an ellipsis + at the end. */ + + /* In the case where we are describing an external function, all + we need to do here (and all we *can* do here) is to describe + the *types* of its formal parameters. */ + + if (TREE_EXTERNAL (decl)) + output_formal_types (TREE_TYPE (decl)); + else + { + register tree arg_decls = DECL_ARGUMENTS (decl); + + /* In the case where the FUNCTION_DECL represents a C++ non-static + member function, skip over the first thing on the DECL_ARGUMENTS + chain. It only represents the hidden `this pointer' parameter + and the debugger should know implicitly that non-static member + functions have such a thing, and should be able to figure out + exactly what the type of each `this pointer' is (from the + AT_member attribute of the parent TAG_subroutine DIE) without + being explicitly told. */ + + if (TREE_CODE (TREE_TYPE (decl)) == METHOD_TYPE) + arg_decls = TREE_CHAIN (arg_decls); + + { + register tree last_arg; + + last_arg = (arg_decls && TREE_CODE (arg_decls) != ERROR_MARK) + ? tree_last (arg_decls) + : NULL; + + /* Generate DIEs to represent all known formal parameters, but + don't do it if this looks like a varargs function. A given + function is considered to be a varargs function if (and only + if) its last named argument is named `__builtin_va_alist'. */ + + if (! last_arg + || ! DECL_NAME (last_arg) + || strcmp (IDENTIFIER_POINTER (DECL_NAME (last_arg)), + "__builtin_va_alist")) + { + register tree parm; + + /* WARNING! Kludge zone ahead! Here we have a special + hack for svr4 SDB compatability. Instead of passing the + current FUNCTION_DECL node as the second parameter (i.e. + the `containing_scope' parameter) to `output_decl' (as + we ought to) we instead pass a pointer to our own private + fake_containing_scope node. That node is a RECORD_TYPE + node which NO OTHER TYPE may ever actually be a member of. + + This pointer will ultimately get passed into `output_type' + as its `containing_scope' parameter. `Output_type' will + then perform its part in the hack... i.e. it will pend + the type of the formal parameter onto the pending_types + list. Later on, when we are done generating the whole + sequence of formal parameter DIEs for this function + definition, we will un-pend all previously pended types + of formal parameters for this function definition. + + This whole kludge prevents any type DIEs from being + mixed in with the formal parameter DIEs. That's good + because svr4 SDB believes that the list of formal + parameter DIEs for a function ends wherever the first + non-formal-parameter DIE appears. Thus, we have to + keep the formal parameter DIEs segregated. They must + all appear (consecutively) at the start of the list of + children for the DIE representing the function definition. + Then (and only then) may we output any additional DIEs + needed to represent the types of these formal parameters. + */ + + for (parm = arg_decls; parm; parm = TREE_CHAIN (parm)) + if (TREE_CODE (parm) == PARM_DECL) + output_decl (parm, fake_containing_scope); + + /* Now that we have finished generating all of the DIEs to + represent the formal parameters themselves, force out + any DIEs needed to represent their types. We do this + simply by un-pending all previously pended types which + can legitimately go into the chain of children DIEs for + the current FUNCTION_DECL. */ + + output_pending_types_for_scope (decl); + } + } + + /* Now try to decide if we should put an ellipsis at the end. */ + + { + register int has_ellipsis = TRUE; /* default assumption */ + register tree fn_arg_types = TYPE_ARG_TYPES (TREE_TYPE (decl)); + + if (fn_arg_types) + { + /* This function declaration/definition was prototyped. */ + + /* If the list of formal argument types ends with a + void_type_node, then the formals list did *not* end + with an ellipsis. */ + + if (TREE_VALUE (tree_last (fn_arg_types)) == void_type_node) + has_ellipsis = FALSE; + } + else + { + /* This function declaration/definition was not prototyped. */ + + /* Note that all non-prototyped function *declarations* are + assumed to represent varargs functions (until proven + otherwise). */ + + if (DECL_INITIAL (decl)) /* if this is a func definition */ + { + if (!arg_decls) + has_ellipsis = FALSE; /* no args == (void) */ + else + { + /* For a non-prototyped function definition which + declares one or more formal parameters, if the name + of the first formal parameter is *not* + __builtin_va_alist then we must assume that this + is *not* a varargs function. */ + + if (DECL_NAME (arg_decls) + && strcmp (IDENTIFIER_POINTER (DECL_NAME (arg_decls)), + "__builtin_va_alist")) + has_ellipsis = FALSE; + } + } + } + + if (has_ellipsis) + output_die (output_unspecified_parameters_die, decl); + } + } + + /* Output Dwarf info for all of the stuff within the body of the + function (if it has one - it may be just a declaration). */ + + { + register tree outer_scope = DECL_INITIAL (decl); + + if (outer_scope && TREE_CODE (outer_scope) != ERROR_MARK) + { + /* Note that here, `outer_scope' is a pointer to the outermost + BLOCK node created to represent the body of a function. + This outermost BLOCK actually represents the outermost + binding contour for the function, i.e. the contour in which + the function's formal parameters get declared. Just within + this contour, there will be another (nested) BLOCK which + represents the function's outermost block. We don't want + to generate a lexical_block DIE to represent the outermost + block of a function body, because that is not really an + independent scope according to ANSI C rules. Rather, it is + the same scope in which the parameters were declared and + for Dwarf, we do not generate a TAG_lexical_block DIE for + that scope. We must however see to it that the LABEL_DECLs + associated with `outer_scope' get DIEs generated for them. */ + + { + register tree label; + + for (label = BLOCK_VARS (outer_scope); + label; + label = TREE_CHAIN (label)) + output_decl (label, outer_scope); + } + + output_decls_for_scope (BLOCK_SUBBLOCKS (outer_scope)); + + /* Finally, force out any pending types which are local to the + outermost block of this function definition. These will + all have a TYPE_CONTEXT which points to the FUNCTION_DECL + node itself. */ + + output_pending_types_for_scope (decl); + } + } + + /* Generate a terminator for the list of stuff `owned' by this + function. */ + + end_sibling_chain (); + + break; + + case TYPE_DECL: + /* If we are in terse mode, don't generate any DIEs to represent + any actual typedefs. Note that even when we are in terse mode, + we must still output DIEs to represent those tagged types which + are used (directly or indirectly) in the specification of either + a return type or a formal parameter type of some function. */ + + if (debug_info_level <= DINFO_LEVEL_TERSE) + if (DECL_NAME (decl) != NULL + || ! TYPE_USED_FOR_FUNCTION (TREE_TYPE (decl))) + return; + + output_type (TREE_TYPE (decl), containing_scope); + + /* Note that unlike the gcc front end (which generates a NULL named + TYPE_DECL node for each complete tagged type, each array type, + and each function type node created) the g++ front end generates + a *named* TYPE_DECL node for each tagged type node created. + Unfortunately, these g++ TYPE_DECL nodes cause us to output many + superfluous and unnecessary TAG_typedef DIEs here. When g++ is + fixed to stop generating these superfluous named TYPE_DECL nodes, + the superfluous TAG_typedef DIEs will likewise cease. */ + + if (DECL_NAME (decl)) + /* Output a DIE to represent the typedef itself. */ + output_die (output_typedef_die, decl); + break; + + case LABEL_DECL: + if (debug_info_level >= DINFO_LEVEL_NORMAL) + output_die (output_label_die, decl); + break; + + case VAR_DECL: + /* If we are in terse mode, don't generate any DIEs to represent + any variable declarations or definitions. */ + + if (debug_info_level <= DINFO_LEVEL_TERSE) + break; + + /* Output any DIEs that are needed to specify the type of this data + object. */ + + output_type (TREE_TYPE (decl), containing_scope); + + /* If the following DIE will represent a data object definition for a + data object with "extern" linkage, output a special "pubnames" DIE + label just ahead of the actual DIE. A reference to this label + was already generated in the .debug_pubnames section sub-entry + for this data object definition. */ + + if (TREE_PUBLIC (decl)) + { + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + sprintf (label, PUB_DIE_LABEL_FMT, next_pubname_number++); + ASM_OUTPUT_LABEL (asm_out_file, label); + } + + /* Now output the DIE to represent the data object itself. */ + + output_die (TREE_PUBLIC (decl) || TREE_EXTERNAL (decl) + ? output_global_variable_die : output_local_variable_die, + decl); + break; + + case FIELD_DECL: + /* Ignore the nameless fields that are used to skip bits. */ + if (DECL_NAME (decl) != 0) + { + output_type (member_declared_type (decl), containing_scope); + output_die (output_member_die, decl); + } + break; + + case PARM_DECL: + /* Force out the type of this formal, if it was not forced out yet. + Note that here we can run afowl of a bug in "classic" svr4 SDB. + It should be able to grok the presence of type DIEs within a list + of TAG_formal_parameter DIEs, but it doesn't. */ + + output_type (TREE_TYPE (decl), containing_scope); + output_die (output_formal_parameter_die, decl); + break; + + default: + abort (); + } +} + +void +dwarfout_file_scope_decl (decl, set_finalizing) + register tree decl; + register int set_finalizing; +{ + switch (TREE_CODE (decl)) + { + case FUNCTION_DECL: + + /* Ignore this FUNCTION_DECL if it refers to a builtin function. */ + + if (TREE_EXTERNAL (decl) && DECL_FUNCTION_CODE (decl)) + return; + + /* Ignore this FUNCTION_DECL if it refers to a file-scope extern + function declaration and if the declaration was never even + referenced from within this entire compilation unit. We + suppress these DIEs in order to save space in the .debug section + (by eliminating entries which are probably useless). Note that + we must not suppress block-local extern declarations (whether + used or not) because that would screw-up the debugger's name + lookup mechanism and cause it to miss things which really ought + to be in scope at a given point. */ + + if (TREE_EXTERNAL (decl) && !TREE_USED (decl)) + return; + + if (TREE_PUBLIC (decl) && ! TREE_EXTERNAL (decl)) + { + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + /* Output a .debug_pubnames entry for a public function + defined in this compilation unit. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_PUBNAMES_SECTION (asm_out_file); + sprintf (label, PUB_DIE_LABEL_FMT, next_pubname_number); + ASM_OUTPUT_DWARF_ADDR (asm_out_file, label); + ASM_OUTPUT_DWARF_STRING (asm_out_file, + IDENTIFIER_POINTER (DECL_NAME (decl))); + ASM_DWARF_POP_SECTION (asm_out_file); + } + + break; + + case VAR_DECL: + + /* Ignore this VAR_DECL if it refers to a file-scope extern data + object declaration and if the declaration was never even + referenced from within this entire compilation unit. We + suppress these DIEs in order to save space in the .debug section + (by eliminating entries which are probably useless). Note that + we must not suppress block-local extern declarations (whether + used or not) because that would screw-up the debugger's name + lookup mechanism and cause it to miss things which really ought + to be in scope at a given point. */ + + if (TREE_EXTERNAL (decl) && !TREE_USED (decl)) + return; + + if (TREE_PUBLIC (decl) && ! TREE_EXTERNAL (decl)) + { + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + if (debug_info_level >= DINFO_LEVEL_NORMAL) + { + /* Output a .debug_pubnames entry for a public variable + defined in this compilation unit. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_PUBNAMES_SECTION (asm_out_file); + sprintf (label, PUB_DIE_LABEL_FMT, next_pubname_number); + ASM_OUTPUT_DWARF_ADDR (asm_out_file, label); + ASM_OUTPUT_DWARF_STRING (asm_out_file, + IDENTIFIER_POINTER (DECL_NAME (decl))); + ASM_DWARF_POP_SECTION (asm_out_file); + } + + if (DECL_INITIAL (decl) == NULL) + { + /* Output a .debug_aranges entry for a public variable + which is tenatively defined in this compilation unit. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_ARANGES_SECTION (asm_out_file); + ASM_OUTPUT_DWARF_ADDR (asm_out_file, + IDENTIFIER_POINTER (DECL_NAME (decl))); + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, + (unsigned) int_size_in_bytes (TREE_TYPE (decl))); + ASM_DWARF_POP_SECTION (asm_out_file); + } + } + + /* If we are in terse mode, don't generate any DIEs to represent + any variable declarations or definitions. */ + + if (debug_info_level <= DINFO_LEVEL_TERSE) + return; + + break; + + case TYPE_DECL: + /* Don't generate any DIEs to represent the standard built-in types. */ + + if (DECL_SOURCE_LINE (decl) == 0) + return; + + /* If we are in terse mode, don't generate any DIEs to represent + any actual typedefs. Note that even when we are in terse mode, + we must still output DIEs to represent those tagged types which + are used (directly or indirectly) in the specification of either + a return type or a formal parameter type of some function. */ + + if (debug_info_level <= DINFO_LEVEL_TERSE) + if (DECL_NAME (decl) != NULL + || ! TYPE_USED_FOR_FUNCTION (TREE_TYPE (decl))) + return; + + break; + + default: + return; + } + + fputc ('\n', asm_out_file); + ASM_DWARF_DEBUG_SECTION (asm_out_file); + finalizing = set_finalizing; + output_decl (decl, NULL); + + /* NOTE: The call above to `output_decl' may have caused one or more + file-scope named types (i.e. tagged types) to be placed onto the + pending_types_list. We have to get those types off of that list + at some point, and this is the perfect time to do it. If we didn't + take them off now, they might still be on the list when cc1 finally + exits. That might be OK if it weren't for the fact that when we put + types onto the pending_types_list, we set the TREE_ASM_WRITTEN flag + for these types, and that causes them never to be output unless + `output_pending_types_for_scope' takes them off of the list and un-sets + their TREE_ASM_WRITTEN flags. */ + + output_pending_types_for_scope (NULL); + + /* The above call should have totally emptied the pending_types_list. */ + + assert (pending_types == 0); + + ASM_DWARF_POP_SECTION (asm_out_file); + + if (TREE_CODE (decl) == FUNCTION_DECL && DECL_INITIAL (decl) != NULL) + current_funcdef_number++; +} + +/* Output a marker (i.e. a label) for the beginning of the generated code + for a lexical block. */ + +void +dwarfout_begin_block (blocknum) + register unsigned blocknum; +{ + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + text_section (); + sprintf (label, BLOCK_BEGIN_LABEL_FMT, blocknum); + ASM_OUTPUT_LABEL (asm_out_file, label); +} + +/* Output a marker (i.e. a label) for the end of the generated code + for a lexical block. */ + +void +dwarfout_end_block (blocknum) + register unsigned blocknum; +{ + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + text_section (); + sprintf (label, BLOCK_END_LABEL_FMT, blocknum); + ASM_OUTPUT_LABEL (asm_out_file, label); +} + +/* Output a marker (i.e. a label) at a point in the assembly code which + corresponds to a given source level label. */ + +void +dwarfout_label (insn) + register rtx insn; +{ + if (debug_info_level >= DINFO_LEVEL_NORMAL) + { + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + text_section (); + sprintf (label, INSN_LABEL_FMT, current_funcdef_number, + (unsigned) INSN_UID (insn)); + ASM_OUTPUT_LABEL (asm_out_file, label); + } +} + +/* Output a marker (i.e. a label) for the absolute end of the generated code + for a function definition. This gets called *after* the epilogue code + has been generated. */ + +void +dwarfout_end_epilogue () +{ + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + /* Output a label to mark the endpoint of the code generated for this + function. */ + + sprintf (label, FUNC_END_LABEL_FMT, current_funcdef_number); + ASM_OUTPUT_LABEL (asm_out_file, label); +} + +static void +shuffle_filename_entry (new_zeroth) + register filename_entry *new_zeroth; +{ + filename_entry temp_entry; + register filename_entry *limit_p; + register filename_entry *move_p; + + if (new_zeroth == &filename_table[0]) + return; + + temp_entry = *new_zeroth; + + /* Shift entries up in the table to make room at [0]. */ + + limit_p = &filename_table[0]; + for (move_p = new_zeroth; move_p > limit_p; move_p--) + *move_p = *(move_p-1); + + /* Install the found entry at [0]. */ + + filename_table[0] = temp_entry; +} + +/* Create a new (string) entry for the .debug_sfnames section. */ + +static void +generate_new_sfname_entry () +{ + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + fputc ('\n', asm_out_file); + ASM_DWARF_SFNAMES_SECTION (asm_out_file); + sprintf (label, SFNAMES_ENTRY_LABEL_FMT, filename_table[0].number); + ASM_OUTPUT_LABEL (asm_out_file, label); + ASM_OUTPUT_DWARF_STRING (asm_out_file, + filename_table[0].name + ? filename_table[0].name + : ""); + ASM_DWARF_POP_SECTION (asm_out_file); +} + +/* Lookup a filename (in the list of filenames that we know about here in + dwarfout.c) and return its "index". The index of each (known) filename + is just a unique number which is associated with only that one filename. + We need such numbers for the sake of generating labels (in the + .debug_sfnames section) and references to those unique labels (in the + .debug_srcinfo and .debug_macinfo sections). + + If the filename given as an argument is not found in our current list, + add it to the list and assign it the next available unique index number. + + Whatever we do (i.e. whether we find a pre-existing filename or add a new + one), we shuffle the filename found (or added) up to the zeroth entry of + our list of filenames (which is always searched linearly). We do this so + as to optimize the most common case for these filename lookups within + dwarfout.c. The most common case by far is the case where we call + lookup_filename to lookup the very same filename that we did a lookup + on the last time we called lookup_filename. We make sure that this + common case is fast because such cases will constitute 99.9% of the + lookups we ever do (in practice). + + If we add a new filename entry to our table, we go ahead and generate + the corresponding entry in the .debug_sfnames section right away. + Doing so allows us to avoid tickling an assembler bug (present in some + m68k assemblers) which yields assembly-time errors in cases where the + difference of two label addresses is taken and where the two labels + are in a section *other* than the one where the difference is being + calculated, and where at least one of the two symbol references is a + forward reference. (This bug could be tickled by our .debug_srcinfo + entries if we don't output their corresponding .debug_sfnames entries + before them.) +*/ + +static unsigned +lookup_filename (file_name) + char *file_name; +{ + register filename_entry *search_p; + register filename_entry *limit_p = &filename_table[ft_entries]; + + for (search_p = filename_table; search_p < limit_p; search_p++) + if (!strcmp (file_name, search_p->name)) + { + /* When we get here, we have found the filename that we were + looking for in the filename_table. Now we want to make sure + that it gets moved to the zero'th entry in the table (if it + is not already there) so that subsequent attempts to find the + same filename will find it as quickly as possible. */ + + shuffle_filename_entry (search_p); + return filename_table[0].number; + } + + /* We come here whenever we have a new filename which is not registered + in the current table. Here we add it to the table. */ + + /* Prepare to add a new table entry by making sure there is enough space + in the table to do so. If not, expand the current table. */ + + if (ft_entries == ft_entries_allocated) + { + ft_entries_allocated += FT_ENTRIES_INCREMENT; + filename_table + = (filename_entry *) + xrealloc (filename_table, + ft_entries_allocated * sizeof (filename_entry)); + } + + /* Initially, add the new entry at the end of the filename table. */ + + filename_table[ft_entries].number = ft_entries; + filename_table[ft_entries].name = xstrdup (file_name); + + /* Shuffle the new entry into filename_table[0]. */ + + shuffle_filename_entry (&filename_table[ft_entries]); + + if (debug_info_level >= DINFO_LEVEL_NORMAL) + generate_new_sfname_entry (); + + ft_entries++; + return filename_table[0].number; +} + +static void +generate_srcinfo_entry (line_entry_num, files_entry_num) + unsigned line_entry_num; + unsigned files_entry_num; +{ + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + fputc ('\n', asm_out_file); + ASM_DWARF_SRCINFO_SECTION (asm_out_file); + sprintf (label, LINE_ENTRY_LABEL_FMT, line_entry_num); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, label, LINE_BEGIN_LABEL); + sprintf (label, SFNAMES_ENTRY_LABEL_FMT, files_entry_num); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, label, SFNAMES_BEGIN_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); +} + +void +dwarfout_line (filename, line) + register char *filename; + register unsigned line; +{ + if (debug_info_level >= DINFO_LEVEL_NORMAL) + { + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + static unsigned last_line_entry_num = 0; + static unsigned prev_file_entry_num = (unsigned) -1; + register unsigned this_file_entry_num = lookup_filename (filename); + + text_section (); + sprintf (label, LINE_CODE_LABEL_FMT, ++last_line_entry_num); + ASM_OUTPUT_LABEL (asm_out_file, label); + + fputc ('\n', asm_out_file); + ASM_DWARF_LINE_SECTION (asm_out_file); + + if (this_file_entry_num != prev_file_entry_num) + { + char line_entry_label[MAX_ARTIFICIAL_LABEL_BYTES]; + + sprintf (line_entry_label, LINE_ENTRY_LABEL_FMT, last_line_entry_num); + ASM_OUTPUT_LABEL (asm_out_file, line_entry_label); + } + + { + register char *tail = strrchr (filename, '/'); + + if (tail != NULL) + filename = tail; + } + + fprintf (asm_out_file, "%s\t%u\t%s %s:%u\n", + UNALIGNED_INT_ASM_OP, line, ASM_COMMENT_START, + filename, line); + ASM_OUTPUT_DWARF_DATA2 (asm_out_file, 0xffff); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, label, TEXT_BEGIN_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + if (this_file_entry_num != prev_file_entry_num) + generate_srcinfo_entry (last_line_entry_num, this_file_entry_num); + prev_file_entry_num = this_file_entry_num; + } +} + +/* Generate an entry in the .debug_macinfo section. */ + +static void +generate_macinfo_entry (type_and_offset, string) + register char *type_and_offset; + register char *string; +{ + fputc ('\n', asm_out_file); + ASM_DWARF_MACINFO_SECTION (asm_out_file); + fprintf (asm_out_file, "%s\t%s\n", UNALIGNED_INT_ASM_OP, type_and_offset); + ASM_OUTPUT_DWARF_STRING (asm_out_file, string); + ASM_DWARF_POP_SECTION (asm_out_file); +} + +void +dwarfout_start_new_source_file (filename) + register char *filename; +{ + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + char type_and_offset[MAX_ARTIFICIAL_LABEL_BYTES*3]; + + sprintf (label, SFNAMES_ENTRY_LABEL_FMT, lookup_filename (filename)); + sprintf (type_and_offset, "0x%08x+%s-%s", + ((unsigned) MACINFO_start << 24), label, SFNAMES_BEGIN_LABEL); + generate_macinfo_entry (type_and_offset, ""); +} + +void +dwarfout_resume_previous_source_file (lineno) + register unsigned lineno; +{ + char type_and_offset[MAX_ARTIFICIAL_LABEL_BYTES*2]; + + sprintf (type_and_offset, "0x%08x+%u", + ((unsigned) MACINFO_resume << 24), lineno); + generate_macinfo_entry (type_and_offset, ""); +} + +/* Called from check_newline in c-parse.y. The `buffer' parameter + contains the tail part of the directive line, i.e. the part which + is past the initial whitespace, #, whitespace, directive-name, + whitespace part. */ + +void +dwarfout_define (lineno, buffer) + register unsigned lineno; + register char *buffer; +{ + static int initialized = 0; + char type_and_offset[MAX_ARTIFICIAL_LABEL_BYTES*2]; + + if (!initialized) + { + dwarfout_start_new_source_file (primary_filename); + initialized = 1; + } + sprintf (type_and_offset, "0x%08x+%u", + ((unsigned) MACINFO_define << 24), lineno); + generate_macinfo_entry (type_and_offset, buffer); +} + +/* Called from check_newline in c-parse.y. The `buffer' parameter + contains the tail part of the directive line, i.e. the part which + is past the initial whitespace, #, whitespace, directive-name, + whitespace part. */ + +void +dwarfout_undef (lineno, buffer) + register unsigned lineno; + register char *buffer; +{ + char type_and_offset[MAX_ARTIFICIAL_LABEL_BYTES*2]; + + sprintf (type_and_offset, "0x%08x+%u", + ((unsigned) MACINFO_undef << 24), lineno); + generate_macinfo_entry (type_and_offset, buffer); +} + +/* Set up for Dwarf output at the start of compilation. */ + +void +dwarfout_init (asm_out_file, main_input_filename) + register FILE *asm_out_file; + register char *main_input_filename; +{ + /* Remember the name of the primary input file. */ + + primary_filename = main_input_filename; + + /* Allocate the initial hunk of the pending_sibling_stack. */ + + pending_sibling_stack + = (unsigned *) + xmalloc (PENDING_SIBLINGS_INCREMENT * sizeof (unsigned)); + pending_siblings_allocated = PENDING_SIBLINGS_INCREMENT; + pending_siblings = 1; + + /* Allocate the initial hunk of the filename_table. */ + + filename_table + = (filename_entry *) + xmalloc (FT_ENTRIES_INCREMENT * sizeof (filename_entry)); + ft_entries_allocated = FT_ENTRIES_INCREMENT; + ft_entries = 0; + + /* Allocate the initial hunk of the pending_types_list. */ + + pending_types_list + = (tree *) xmalloc (PENDING_TYPES_INCREMENT * sizeof (tree)); + pending_types_allocated = PENDING_TYPES_INCREMENT; + pending_types = 0; + + /* Create an artificial RECORD_TYPE node which we can use in our hack + to get the DIEs representing types of formal parameters to come out + only *after* the DIEs for the formal parameters themselves. */ + + fake_containing_scope = make_node (RECORD_TYPE); + + /* Output a starting label for the .text section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_TEXT_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, TEXT_BEGIN_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Output a starting label for the .data section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_DATA_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, DATA_BEGIN_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Output a starting label for the .data1 section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_DATA1_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, DATA1_BEGIN_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Output a starting label for the .rodata section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_RODATA_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, RODATA_BEGIN_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Output a starting label for the .rodata1 section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_RODATA1_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, RODATA1_BEGIN_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Output a starting label for the .bss section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_BSS_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, BSS_BEGIN_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + if (debug_info_level >= DINFO_LEVEL_NORMAL) + { + /* Output a starting label and an initial (compilation directory) + entry for the .debug_sfnames section. The starting label will be + referenced by the initial entry in the .debug_srcinfo section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_SFNAMES_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, SFNAMES_BEGIN_LABEL); + { + register unsigned len = 1024; + register char *dirname = (char *) xmalloc (len + 1); + + /* We don't know how much space the dirname needs, + so try bigger and bigger buffers until it fits. */ + for (;;) + { + getcwd (dirname, len); /* Being conservative here. */ + if (strlen (dirname) < len - 1) /* Being conservative here. */ + break; + len *= 2; + dirname = (char *) xrealloc (dirname, len + 1); + } + strcat (dirname, "/"); + ASM_OUTPUT_DWARF_STRING (asm_out_file, dirname); + free (dirname); + } + ASM_DWARF_POP_SECTION (asm_out_file); + + if (debug_info_level >= DINFO_LEVEL_VERBOSE) + { + /* Output a starting label for the .debug_macinfo section. This + label will be referenced by the AT_mac_info attribute in the + TAG_compile_unit DIE. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_MACINFO_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, MACINFO_BEGIN_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + } + + /* Generate the initial entry for the .line section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_LINE_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, LINE_BEGIN_LABEL); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, LINE_END_LABEL, LINE_BEGIN_LABEL); + ASM_OUTPUT_DWARF_ADDR (asm_out_file, TEXT_BEGIN_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Generate the initial entry for the .debug_srcinfo section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_SRCINFO_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, SRCINFO_BEGIN_LABEL); + ASM_OUTPUT_DWARF_ADDR (asm_out_file, LINE_BEGIN_LABEL); + ASM_OUTPUT_DWARF_ADDR (asm_out_file, SFNAMES_BEGIN_LABEL); + ASM_OUTPUT_DWARF_ADDR (asm_out_file, TEXT_BEGIN_LABEL); + ASM_OUTPUT_DWARF_ADDR (asm_out_file, TEXT_END_LABEL); +#ifdef DWARF_TIMESTAMPS + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, time (NULL)); +#else + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, -1); +#endif + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Generate the initial entry for the .debug_pubnames section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_PUBNAMES_SECTION (asm_out_file); + ASM_OUTPUT_DWARF_ADDR (asm_out_file, DEBUG_BEGIN_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Generate the initial entry for the .debug_aranges section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_ARANGES_SECTION (asm_out_file); + ASM_OUTPUT_DWARF_ADDR (asm_out_file, DEBUG_BEGIN_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + } + + /* Setup first DIE number == 1. */ + NEXT_DIE_NUM = next_unused_dienum++; + + /* Generate the initial DIE for the .debug section. Note that the + (string) value given in the AT_name attribute of the TAG_compile_unit + DIE will (typically) be a relative pathname and that this pathname + should be taken as being relative to the directory from which the + compiler was invoked when the given (base) source file was compiled. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_DEBUG_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, DEBUG_BEGIN_LABEL); + output_die (output_compile_unit_die, main_input_filename); + ASM_DWARF_POP_SECTION (asm_out_file); + + fputc ('\n', asm_out_file); +} + +/* Output stuff that dwarf requires at the end of every file. */ + +void +dwarfout_finish () +{ + char label[MAX_ARTIFICIAL_LABEL_BYTES]; + + fputc ('\n', asm_out_file); + ASM_DWARF_DEBUG_SECTION (asm_out_file); + + /* Mark the end of the chain of siblings which represent all file-scope + declarations in this compilation unit. */ + + /* The (null) DIE which represents the terminator for the (sibling linked) + list of file-scope items is *special*. Normally, we would just call + end_sibling_chain at this point in order to output a word with the + value `4' and that word would act as the terminator for the list of + DIEs describing file-scope items. Unfortunately, if we were to simply + do that, the label that would follow this DIE in the .debug section + (i.e. `..D2') would *not* be properly aligned (as it must be on some + machines) to a 4 byte boundary. + + In order to force the label `..D2' to get aligned to a 4 byte boundary, + the trick used is to insert extra (otherwise useless) padding bytes + into the (null) DIE that we know must preceed the ..D2 label in the + .debug section. The amount of padding required can be anywhere between + 0 and 3 bytes. The length word at the start of this DIE (i.e. the one + with the padding) would normally contain the value 4, but now it will + also have to include the padding bytes, so it will instead have some + value in the range 4..7. + + Fortunately, the rules of Dwarf say that any DIE whose length word + contains *any* value less than 8 should be treated as a null DIE, so + this trick works out nicely. Clever, eh? Don't give me any credit + (or blame). I didn't think of this scheme. I just conformed to it. + */ + + output_die (output_padded_null_die, (void *)0); + dienum_pop (); + + sprintf (label, DIE_BEGIN_LABEL_FMT, NEXT_DIE_NUM); + ASM_OUTPUT_LABEL (asm_out_file, label); /* should be ..D2 */ + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Output a terminator label for the .text section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_TEXT_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, TEXT_END_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Output a terminator label for the .data section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_DATA_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, DATA_END_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Output a terminator label for the .data1 section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_DATA1_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, DATA1_END_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Output a terminator label for the .rodata section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_RODATA_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, RODATA_END_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Output a terminator label for the .rodata1 section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_RODATA1_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, RODATA1_END_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Output a terminator label for the .bss section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_BSS_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, BSS_END_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + if (debug_info_level >= DINFO_LEVEL_NORMAL) + { + /* Output a terminating entry for the .line section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_LINE_SECTION (asm_out_file); + ASM_OUTPUT_LABEL (asm_out_file, LINE_LAST_ENTRY_LABEL); + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0); + ASM_OUTPUT_DWARF_DATA2 (asm_out_file, 0xffff); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, TEXT_END_LABEL, TEXT_BEGIN_LABEL); + ASM_OUTPUT_LABEL (asm_out_file, LINE_END_LABEL); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Output a terminating entry for the .debug_srcinfo section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_SRCINFO_SECTION (asm_out_file); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, + LINE_LAST_ENTRY_LABEL, LINE_BEGIN_LABEL); + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, -1); + ASM_DWARF_POP_SECTION (asm_out_file); + + if (debug_info_level >= DINFO_LEVEL_VERBOSE) + { + /* Output terminating entries for the .debug_macinfo section. */ + + dwarfout_resume_previous_source_file (0); + + fputc ('\n', asm_out_file); + ASM_DWARF_MACINFO_SECTION (asm_out_file); + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0); + ASM_OUTPUT_DWARF_STRING (asm_out_file, ""); + ASM_DWARF_POP_SECTION (asm_out_file); + } + + /* Generate the terminating entry for the .debug_pubnames section. */ + + fputc ('\n', asm_out_file); + ASM_DWARF_PUBNAMES_SECTION (asm_out_file); + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0); + ASM_OUTPUT_DWARF_STRING (asm_out_file, ""); + ASM_DWARF_POP_SECTION (asm_out_file); + + /* Generate the terminating entries for the .debug_aranges section. + + Note that we want to do this only *after* we have output the end + labels (for the various program sections) which we are going to + refer to here. This allows us to work around a bug in the m68k + svr4 assembler. That assembler gives bogus assembly-time errors + if (within any given section) you try to take the difference of + two relocatable symbols, both of which are located within some + other section, and if one (or both?) of the symbols involved is + being forward-referenced. By generating the .debug_aranges + entries at this late point in the assembly output, we skirt the + issue simply by avoiding forward-references. + */ + + fputc ('\n', asm_out_file); + ASM_DWARF_ARANGES_SECTION (asm_out_file); + + ASM_OUTPUT_DWARF_ADDR (asm_out_file, TEXT_BEGIN_LABEL); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, TEXT_END_LABEL, TEXT_BEGIN_LABEL); + + ASM_OUTPUT_DWARF_ADDR (asm_out_file, DATA_BEGIN_LABEL); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, DATA_END_LABEL, DATA_BEGIN_LABEL); + + ASM_OUTPUT_DWARF_ADDR (asm_out_file, DATA1_BEGIN_LABEL); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, DATA1_END_LABEL, + DATA1_BEGIN_LABEL); + + ASM_OUTPUT_DWARF_ADDR (asm_out_file, RODATA_BEGIN_LABEL); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, RODATA_END_LABEL, + RODATA_BEGIN_LABEL); + + ASM_OUTPUT_DWARF_ADDR (asm_out_file, RODATA1_BEGIN_LABEL); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, RODATA1_END_LABEL, + RODATA1_BEGIN_LABEL); + + ASM_OUTPUT_DWARF_ADDR (asm_out_file, BSS_BEGIN_LABEL); + ASM_OUTPUT_DWARF_DELTA4 (asm_out_file, BSS_END_LABEL, BSS_BEGIN_LABEL); + + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0); + ASM_OUTPUT_DWARF_DATA4 (asm_out_file, 0); + + ASM_DWARF_POP_SECTION (asm_out_file); + } +} + +#endif /* DWARF_DEBUGGING_INFO */ |
