[lldb] Support for DWARF-5 atomic types

Summary:
This patch adds support for atomic types (DW_TAG_atomic_type) to LLDB. It's mostly just filling out all the switch-statements that didn't implement Atomic case with the usual boilerplate.

Thanks Pavel for writing the test case.

Reviewers: labath, aprantl, shafik

Reviewed By: labath

Subscribers: jfb, abidh, JDevlieghere, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D71183

1 files changed, 104 insertions, 0 deletions

diff --git a/lldb/test/Shell/SymbolFile/DWARF/dwarf5-atomic.s b/lldb/test/Shell/SymbolFile/DWARF/dwarf5-atomic.s
new file mode 100644
index 00000000000..9d25956c0df
--- /dev/null
+++ b/lldb/test/Shell/SymbolFile/DWARF/dwarf5-atomic.s
@@ -0,0 +1,104 @@
+# REQUIRES: x86
+
+# RUN: llvm-mc -triple=x86_64-pc-linux -filetype=obj %s > %t
+# RUN: %lldb %t -o "target variable integer structure" -o exit | FileCheck %s
+
+# CHECK: (_Atomic(int)) integer = 14159
+# CHECK: (_Atomic(struct_type)) structure = {}
+
+        .data
+integer:
+        .long 14159
+structure:
+        .byte 0
+
+        .section        .debug_abbrev,"",@progbits
+        .byte   1                       # Abbreviation Code
+        .byte   17                      # DW_TAG_compile_unit
+        .byte   1                       # DW_CHILDREN_yes
+        .byte   37                      # DW_AT_producer
+        .byte   8                       # DW_FORM_string
+        .byte   19                      # DW_AT_language
+        .byte   5                       # DW_FORM_data2
+        .byte   0                       # EOM(1)
+        .byte   0                       # EOM(2)
+        .byte   2                       # Abbreviation Code
+        .byte   52                      # DW_TAG_variable
+        .byte   0                       # DW_CHILDREN_no
+        .byte   3                       # DW_AT_name
+        .byte   8                       # DW_FORM_string
+        .byte   73                      # DW_AT_type
+        .byte   19                      # DW_FORM_ref4
+        .byte   2                       # DW_AT_location
+        .byte   24                      # DW_FORM_exprloc
+        .byte   0                       # EOM(1)
+        .byte   0                       # EOM(2)
+        .byte   3                       # Abbreviation Code
+        .byte   71                      # DW_TAG_atomic_type
+        .byte   0                       # DW_CHILDREN_no
+        .byte   73                      # DW_AT_type
+        .byte   19                      # DW_FORM_ref4
+        .byte   0                       # EOM(1)
+        .byte   0                       # EOM(2)
+        .byte   4                       # Abbreviation Code
+        .byte   36                      # DW_TAG_base_type
+        .byte   0                       # DW_CHILDREN_no
+        .byte   3                       # DW_AT_name
+        .byte   8                       # DW_FORM_string
+        .byte   62                      # DW_AT_encoding
+        .byte   11                      # DW_FORM_data1
+        .byte   11                      # DW_AT_byte_size
+        .byte   11                      # DW_FORM_data1
+        .byte   0                       # EOM(1)
+        .byte   0                       # EOM(2)
+        .byte   5                       # Abbreviation Code
+        .byte   19                      # DW_TAG_structure_type
+        .byte   0                       # DW_CHILDREN_no
+        .byte   3                       # DW_AT_name
+        .byte   8                       # DW_FORM_string
+        .byte   11                      # DW_AT_byte_size
+        .byte   11                      # DW_FORM_data1
+        .byte   0                       # EOM(1)
+        .byte   0                       # EOM(2)
+        .byte   0                       # EOM(3)
+
+        .section        .debug_info,"",@progbits
+.Lcu_begin0:
+        .long   .Ldebug_info_end0-.Ldebug_info_start0 # Length of Unit
+.Ldebug_info_start0:
+        .short  5                       # DWARF version number
+        .byte   1                       # DWARF Unit Type
+        .byte   8                       # Address Size (in bytes)
+        .long   .debug_abbrev           # Offset Into Abbrev. Section
+        .byte   1                       # Abbrev [1] 0xb:0x50 DW_TAG_compile_unit
+        .asciz  "Hand-written DWARF"    # DW_AT_producer
+        .short  12                      # DW_AT_language
+        .byte   2                       # Abbrev [2] DW_TAG_variable
+        .asciz  "integer"               # DW_AT_name
+        .long   .Latomic_int            # DW_AT_type
+        .byte   9                       # DW_AT_location
+        .byte   3
+        .quad   integer
+        .byte   2                       # Abbrev [2] DW_TAG_variable
+        .asciz  "structure"             # DW_AT_name
+        .long   .Latomic_struct         # DW_AT_type
+        .byte   9                       # DW_AT_location
+        .byte   3
+        .quad   structure
+.Latomic_int:
+        .byte   3                       # Abbrev [3] DW_TAG_atomic_type
+        .long   .Lint                   # DW_AT_type
+.Lint:
+        .byte   4                       # Abbrev [4] 0x53:0x7 DW_TAG_base_type
+        .asciz  "int"                   # DW_AT_name
+        .byte   5                       # DW_AT_encoding
+        .byte   4                       # DW_AT_byte_size
+.Latomic_struct:
+        .byte   3                       # Abbrev [3] DW_TAG_atomic_type
+        .long   .Lstruct                # DW_AT_type
+.Lstruct:
+        .byte   5                       # Abbrev [5] DW_TAG_structure_type
+        .asciz  "struct_type"           # DW_AT_name
+        .byte   0                       # DW_AT_byte_size
+        .byte   0                       # End Of Children Mark
+.Ldebug_info_end0: