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-rw-r--r--libcxxabi/src/Unwind/UnwindCursor.hpp1317
1 files changed, 0 insertions, 1317 deletions
diff --git a/libcxxabi/src/Unwind/UnwindCursor.hpp b/libcxxabi/src/Unwind/UnwindCursor.hpp
deleted file mode 100644
index b4d413f4f32..00000000000
--- a/libcxxabi/src/Unwind/UnwindCursor.hpp
+++ /dev/null
@@ -1,1317 +0,0 @@
-//===------------------------- UnwindCursor.hpp ---------------------------===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is dual licensed under the MIT and the University of Illinois Open
-// Source Licenses. See LICENSE.TXT for details.
-//
-//
-// C++ interface to lower levels of libuwind
-//===----------------------------------------------------------------------===//
-
-#ifndef __UNWINDCURSOR_HPP__
-#define __UNWINDCURSOR_HPP__
-
-#include <algorithm>
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <pthread.h>
-#include <unwind.h>
-
-#ifdef __APPLE__
- #include <mach-o/dyld.h>
-#endif
-
-#include "config.h"
-
-#include "AddressSpace.hpp"
-#include "CompactUnwinder.hpp"
-#include "config.h"
-#include "DwarfInstructions.hpp"
-#include "EHHeaderParser.hpp"
-#include "libunwind.h"
-#include "Registers.hpp"
-#include "Unwind-EHABI.h"
-
-namespace libunwind {
-
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
-/// Cache of recently found FDEs.
-template <typename A>
-class _LIBUNWIND_HIDDEN DwarfFDECache {
- typedef typename A::pint_t pint_t;
-public:
- static pint_t findFDE(pint_t mh, pint_t pc);
- static void add(pint_t mh, pint_t ip_start, pint_t ip_end, pint_t fde);
- static void removeAllIn(pint_t mh);
- static void iterateCacheEntries(void (*func)(unw_word_t ip_start,
- unw_word_t ip_end,
- unw_word_t fde, unw_word_t mh));
-
-private:
-
- struct entry {
- pint_t mh;
- pint_t ip_start;
- pint_t ip_end;
- pint_t fde;
- };
-
- // These fields are all static to avoid needing an initializer.
- // There is only one instance of this class per process.
- static pthread_rwlock_t _lock;
-#ifdef __APPLE__
- static void dyldUnloadHook(const struct mach_header *mh, intptr_t slide);
- static bool _registeredForDyldUnloads;
-#endif
- // Can't use std::vector<> here because this code is below libc++.
- static entry *_buffer;
- static entry *_bufferUsed;
- static entry *_bufferEnd;
- static entry _initialBuffer[64];
-};
-
-template <typename A>
-typename DwarfFDECache<A>::entry *
-DwarfFDECache<A>::_buffer = _initialBuffer;
-
-template <typename A>
-typename DwarfFDECache<A>::entry *
-DwarfFDECache<A>::_bufferUsed = _initialBuffer;
-
-template <typename A>
-typename DwarfFDECache<A>::entry *
-DwarfFDECache<A>::_bufferEnd = &_initialBuffer[64];
-
-template <typename A>
-typename DwarfFDECache<A>::entry DwarfFDECache<A>::_initialBuffer[64];
-
-template <typename A>
-pthread_rwlock_t DwarfFDECache<A>::_lock = PTHREAD_RWLOCK_INITIALIZER;
-
-#ifdef __APPLE__
-template <typename A>
-bool DwarfFDECache<A>::_registeredForDyldUnloads = false;
-#endif
-
-template <typename A>
-typename A::pint_t DwarfFDECache<A>::findFDE(pint_t mh, pint_t pc) {
- pint_t result = 0;
- _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_rdlock(&_lock));
- for (entry *p = _buffer; p < _bufferUsed; ++p) {
- if ((mh == p->mh) || (mh == 0)) {
- if ((p->ip_start <= pc) && (pc < p->ip_end)) {
- result = p->fde;
- break;
- }
- }
- }
- _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_unlock(&_lock));
- return result;
-}
-
-template <typename A>
-void DwarfFDECache<A>::add(pint_t mh, pint_t ip_start, pint_t ip_end,
- pint_t fde) {
- _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_wrlock(&_lock));
- if (_bufferUsed >= _bufferEnd) {
- size_t oldSize = (size_t)(_bufferEnd - _buffer);
- size_t newSize = oldSize * 4;
- // Can't use operator new (we are below it).
- entry *newBuffer = (entry *)malloc(newSize * sizeof(entry));
- memcpy(newBuffer, _buffer, oldSize * sizeof(entry));
- if (_buffer != _initialBuffer)
- free(_buffer);
- _buffer = newBuffer;
- _bufferUsed = &newBuffer[oldSize];
- _bufferEnd = &newBuffer[newSize];
- }
- _bufferUsed->mh = mh;
- _bufferUsed->ip_start = ip_start;
- _bufferUsed->ip_end = ip_end;
- _bufferUsed->fde = fde;
- ++_bufferUsed;
-#ifdef __APPLE__
- if (!_registeredForDyldUnloads) {
- _dyld_register_func_for_remove_image(&dyldUnloadHook);
- _registeredForDyldUnloads = true;
- }
-#endif
- _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_unlock(&_lock));
-}
-
-template <typename A>
-void DwarfFDECache<A>::removeAllIn(pint_t mh) {
- _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_wrlock(&_lock));
- entry *d = _buffer;
- for (const entry *s = _buffer; s < _bufferUsed; ++s) {
- if (s->mh != mh) {
- if (d != s)
- *d = *s;
- ++d;
- }
- }
- _bufferUsed = d;
- _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_unlock(&_lock));
-}
-
-#ifdef __APPLE__
-template <typename A>
-void DwarfFDECache<A>::dyldUnloadHook(const struct mach_header *mh, intptr_t ) {
- removeAllIn((pint_t) mh);
-}
-#endif
-
-template <typename A>
-void DwarfFDECache<A>::iterateCacheEntries(void (*func)(
- unw_word_t ip_start, unw_word_t ip_end, unw_word_t fde, unw_word_t mh)) {
- _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_wrlock(&_lock));
- for (entry *p = _buffer; p < _bufferUsed; ++p) {
- (*func)(p->ip_start, p->ip_end, p->fde, p->mh);
- }
- _LIBUNWIND_LOG_NON_ZERO(::pthread_rwlock_unlock(&_lock));
-}
-#endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND
-
-
-#define arrayoffsetof(type, index, field) ((size_t)(&((type *)0)[index].field))
-
-#if _LIBUNWIND_SUPPORT_COMPACT_UNWIND
-template <typename A> class UnwindSectionHeader {
-public:
- UnwindSectionHeader(A &addressSpace, typename A::pint_t addr)
- : _addressSpace(addressSpace), _addr(addr) {}
-
- uint32_t version() const {
- return _addressSpace.get32(_addr +
- offsetof(unwind_info_section_header, version));
- }
- uint32_t commonEncodingsArraySectionOffset() const {
- return _addressSpace.get32(_addr +
- offsetof(unwind_info_section_header,
- commonEncodingsArraySectionOffset));
- }
- uint32_t commonEncodingsArrayCount() const {
- return _addressSpace.get32(_addr + offsetof(unwind_info_section_header,
- commonEncodingsArrayCount));
- }
- uint32_t personalityArraySectionOffset() const {
- return _addressSpace.get32(_addr + offsetof(unwind_info_section_header,
- personalityArraySectionOffset));
- }
- uint32_t personalityArrayCount() const {
- return _addressSpace.get32(
- _addr + offsetof(unwind_info_section_header, personalityArrayCount));
- }
- uint32_t indexSectionOffset() const {
- return _addressSpace.get32(
- _addr + offsetof(unwind_info_section_header, indexSectionOffset));
- }
- uint32_t indexCount() const {
- return _addressSpace.get32(
- _addr + offsetof(unwind_info_section_header, indexCount));
- }
-
-private:
- A &_addressSpace;
- typename A::pint_t _addr;
-};
-
-template <typename A> class UnwindSectionIndexArray {
-public:
- UnwindSectionIndexArray(A &addressSpace, typename A::pint_t addr)
- : _addressSpace(addressSpace), _addr(addr) {}
-
- uint32_t functionOffset(uint32_t index) const {
- return _addressSpace.get32(
- _addr + arrayoffsetof(unwind_info_section_header_index_entry, index,
- functionOffset));
- }
- uint32_t secondLevelPagesSectionOffset(uint32_t index) const {
- return _addressSpace.get32(
- _addr + arrayoffsetof(unwind_info_section_header_index_entry, index,
- secondLevelPagesSectionOffset));
- }
- uint32_t lsdaIndexArraySectionOffset(uint32_t index) const {
- return _addressSpace.get32(
- _addr + arrayoffsetof(unwind_info_section_header_index_entry, index,
- lsdaIndexArraySectionOffset));
- }
-
-private:
- A &_addressSpace;
- typename A::pint_t _addr;
-};
-
-template <typename A> class UnwindSectionRegularPageHeader {
-public:
- UnwindSectionRegularPageHeader(A &addressSpace, typename A::pint_t addr)
- : _addressSpace(addressSpace), _addr(addr) {}
-
- uint32_t kind() const {
- return _addressSpace.get32(
- _addr + offsetof(unwind_info_regular_second_level_page_header, kind));
- }
- uint16_t entryPageOffset() const {
- return _addressSpace.get16(
- _addr + offsetof(unwind_info_regular_second_level_page_header,
- entryPageOffset));
- }
- uint16_t entryCount() const {
- return _addressSpace.get16(
- _addr +
- offsetof(unwind_info_regular_second_level_page_header, entryCount));
- }
-
-private:
- A &_addressSpace;
- typename A::pint_t _addr;
-};
-
-template <typename A> class UnwindSectionRegularArray {
-public:
- UnwindSectionRegularArray(A &addressSpace, typename A::pint_t addr)
- : _addressSpace(addressSpace), _addr(addr) {}
-
- uint32_t functionOffset(uint32_t index) const {
- return _addressSpace.get32(
- _addr + arrayoffsetof(unwind_info_regular_second_level_entry, index,
- functionOffset));
- }
- uint32_t encoding(uint32_t index) const {
- return _addressSpace.get32(
- _addr +
- arrayoffsetof(unwind_info_regular_second_level_entry, index, encoding));
- }
-
-private:
- A &_addressSpace;
- typename A::pint_t _addr;
-};
-
-template <typename A> class UnwindSectionCompressedPageHeader {
-public:
- UnwindSectionCompressedPageHeader(A &addressSpace, typename A::pint_t addr)
- : _addressSpace(addressSpace), _addr(addr) {}
-
- uint32_t kind() const {
- return _addressSpace.get32(
- _addr +
- offsetof(unwind_info_compressed_second_level_page_header, kind));
- }
- uint16_t entryPageOffset() const {
- return _addressSpace.get16(
- _addr + offsetof(unwind_info_compressed_second_level_page_header,
- entryPageOffset));
- }
- uint16_t entryCount() const {
- return _addressSpace.get16(
- _addr +
- offsetof(unwind_info_compressed_second_level_page_header, entryCount));
- }
- uint16_t encodingsPageOffset() const {
- return _addressSpace.get16(
- _addr + offsetof(unwind_info_compressed_second_level_page_header,
- encodingsPageOffset));
- }
- uint16_t encodingsCount() const {
- return _addressSpace.get16(
- _addr + offsetof(unwind_info_compressed_second_level_page_header,
- encodingsCount));
- }
-
-private:
- A &_addressSpace;
- typename A::pint_t _addr;
-};
-
-template <typename A> class UnwindSectionCompressedArray {
-public:
- UnwindSectionCompressedArray(A &addressSpace, typename A::pint_t addr)
- : _addressSpace(addressSpace), _addr(addr) {}
-
- uint32_t functionOffset(uint32_t index) const {
- return UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(
- _addressSpace.get32(_addr + index * sizeof(uint32_t)));
- }
- uint16_t encodingIndex(uint32_t index) const {
- return UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(
- _addressSpace.get32(_addr + index * sizeof(uint32_t)));
- }
-
-private:
- A &_addressSpace;
- typename A::pint_t _addr;
-};
-
-template <typename A> class UnwindSectionLsdaArray {
-public:
- UnwindSectionLsdaArray(A &addressSpace, typename A::pint_t addr)
- : _addressSpace(addressSpace), _addr(addr) {}
-
- uint32_t functionOffset(uint32_t index) const {
- return _addressSpace.get32(
- _addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry,
- index, functionOffset));
- }
- uint32_t lsdaOffset(uint32_t index) const {
- return _addressSpace.get32(
- _addr + arrayoffsetof(unwind_info_section_header_lsda_index_entry,
- index, lsdaOffset));
- }
-
-private:
- A &_addressSpace;
- typename A::pint_t _addr;
-};
-#endif // _LIBUNWIND_SUPPORT_COMPACT_UNWIND
-
-class _LIBUNWIND_HIDDEN AbstractUnwindCursor {
-public:
- // NOTE: provide a class specific placement deallocation function (S5.3.4 p20)
- // This avoids an unnecessary dependency to libc++abi.
- void operator delete(void *, size_t) {}
-
- virtual ~AbstractUnwindCursor() {}
- virtual bool validReg(int) { _LIBUNWIND_ABORT("validReg not implemented"); }
- virtual unw_word_t getReg(int) { _LIBUNWIND_ABORT("getReg not implemented"); }
- virtual void setReg(int, unw_word_t) {
- _LIBUNWIND_ABORT("setReg not implemented");
- }
- virtual bool validFloatReg(int) {
- _LIBUNWIND_ABORT("validFloatReg not implemented");
- }
- virtual unw_fpreg_t getFloatReg(int) {
- _LIBUNWIND_ABORT("getFloatReg not implemented");
- }
- virtual void setFloatReg(int, unw_fpreg_t) {
- _LIBUNWIND_ABORT("setFloatReg not implemented");
- }
- virtual int step() { _LIBUNWIND_ABORT("step not implemented"); }
- virtual void getInfo(unw_proc_info_t *) {
- _LIBUNWIND_ABORT("getInfo not implemented");
- }
- virtual void jumpto() { _LIBUNWIND_ABORT("jumpto not implemented"); }
- virtual bool isSignalFrame() {
- _LIBUNWIND_ABORT("isSignalFrame not implemented");
- }
- virtual bool getFunctionName(char *, size_t, unw_word_t *) {
- _LIBUNWIND_ABORT("getFunctionName not implemented");
- }
- virtual void setInfoBasedOnIPRegister(bool = false) {
- _LIBUNWIND_ABORT("setInfoBasedOnIPRegister not implemented");
- }
- virtual const char *getRegisterName(int) {
- _LIBUNWIND_ABORT("getRegisterName not implemented");
- }
-#ifdef __arm__
- virtual void saveVFPAsX() { _LIBUNWIND_ABORT("saveVFPAsX not implemented"); }
-#endif
-};
-
-/// UnwindCursor contains all state (including all register values) during
-/// an unwind. This is normally stack allocated inside a unw_cursor_t.
-template <typename A, typename R>
-class UnwindCursor : public AbstractUnwindCursor{
- typedef typename A::pint_t pint_t;
-public:
- UnwindCursor(unw_context_t *context, A &as);
- UnwindCursor(A &as, void *threadArg);
- virtual ~UnwindCursor() {}
- virtual bool validReg(int);
- virtual unw_word_t getReg(int);
- virtual void setReg(int, unw_word_t);
- virtual bool validFloatReg(int);
- virtual unw_fpreg_t getFloatReg(int);
- virtual void setFloatReg(int, unw_fpreg_t);
- virtual int step();
- virtual void getInfo(unw_proc_info_t *);
- virtual void jumpto();
- virtual bool isSignalFrame();
- virtual bool getFunctionName(char *buf, size_t len, unw_word_t *off);
- virtual void setInfoBasedOnIPRegister(bool isReturnAddress = false);
- virtual const char *getRegisterName(int num);
-#ifdef __arm__
- virtual void saveVFPAsX();
-#endif
-
-private:
-
-#if LIBCXXABI_ARM_EHABI
- bool getInfoFromEHABISection(pint_t pc, const UnwindInfoSections &sects);
-#endif
-
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
- bool getInfoFromDwarfSection(pint_t pc, const UnwindInfoSections &sects,
- uint32_t fdeSectionOffsetHint=0);
- int stepWithDwarfFDE() {
- return DwarfInstructions<A, R>::stepWithDwarf(_addressSpace,
- (pint_t)this->getReg(UNW_REG_IP),
- (pint_t)_info.unwind_info,
- _registers);
- }
-#endif
-
-#if _LIBUNWIND_SUPPORT_COMPACT_UNWIND
- bool getInfoFromCompactEncodingSection(pint_t pc,
- const UnwindInfoSections &sects);
- int stepWithCompactEncoding() {
- #if _LIBUNWIND_SUPPORT_DWARF_UNWIND
- if ( compactSaysUseDwarf() )
- return stepWithDwarfFDE();
- #endif
- R dummy;
- return stepWithCompactEncoding(dummy);
- }
-
- int stepWithCompactEncoding(Registers_x86_64 &) {
- return CompactUnwinder_x86_64<A>::stepWithCompactEncoding(
- _info.format, _info.start_ip, _addressSpace, _registers);
- }
-
- int stepWithCompactEncoding(Registers_x86 &) {
- return CompactUnwinder_x86<A>::stepWithCompactEncoding(
- _info.format, (uint32_t)_info.start_ip, _addressSpace, _registers);
- }
-
- int stepWithCompactEncoding(Registers_ppc &) {
- return UNW_EINVAL;
- }
-
- int stepWithCompactEncoding(Registers_arm64 &) {
- return CompactUnwinder_arm64<A>::stepWithCompactEncoding(
- _info.format, _info.start_ip, _addressSpace, _registers);
- }
-
- bool compactSaysUseDwarf(uint32_t *offset=NULL) const {
- R dummy;
- return compactSaysUseDwarf(dummy, offset);
- }
-
- bool compactSaysUseDwarf(Registers_x86_64 &, uint32_t *offset) const {
- if ((_info.format & UNWIND_X86_64_MODE_MASK) == UNWIND_X86_64_MODE_DWARF) {
- if (offset)
- *offset = (_info.format & UNWIND_X86_64_DWARF_SECTION_OFFSET);
- return true;
- }
- return false;
- }
-
- bool compactSaysUseDwarf(Registers_x86 &, uint32_t *offset) const {
- if ((_info.format & UNWIND_X86_MODE_MASK) == UNWIND_X86_MODE_DWARF) {
- if (offset)
- *offset = (_info.format & UNWIND_X86_DWARF_SECTION_OFFSET);
- return true;
- }
- return false;
- }
-
- bool compactSaysUseDwarf(Registers_ppc &, uint32_t *) const {
- return true;
- }
-
- bool compactSaysUseDwarf(Registers_arm64 &, uint32_t *offset) const {
- if ((_info.format & UNWIND_ARM64_MODE_MASK) == UNWIND_ARM64_MODE_DWARF) {
- if (offset)
- *offset = (_info.format & UNWIND_ARM64_DWARF_SECTION_OFFSET);
- return true;
- }
- return false;
- }
-#endif // _LIBUNWIND_SUPPORT_COMPACT_UNWIND
-
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
- compact_unwind_encoding_t dwarfEncoding() const {
- R dummy;
- return dwarfEncoding(dummy);
- }
-
- compact_unwind_encoding_t dwarfEncoding(Registers_x86_64 &) const {
- return UNWIND_X86_64_MODE_DWARF;
- }
-
- compact_unwind_encoding_t dwarfEncoding(Registers_x86 &) const {
- return UNWIND_X86_MODE_DWARF;
- }
-
- compact_unwind_encoding_t dwarfEncoding(Registers_ppc &) const {
- return 0;
- }
-
- compact_unwind_encoding_t dwarfEncoding(Registers_arm64 &) const {
- return UNWIND_ARM64_MODE_DWARF;
- }
-#endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND
-
-
- A &_addressSpace;
- R _registers;
- unw_proc_info_t _info;
- bool _unwindInfoMissing;
- bool _isSignalFrame;
-};
-
-
-template <typename A, typename R>
-UnwindCursor<A, R>::UnwindCursor(unw_context_t *context, A &as)
- : _addressSpace(as), _registers(context), _unwindInfoMissing(false),
- _isSignalFrame(false) {
- static_assert(sizeof(UnwindCursor<A, R>) < sizeof(unw_cursor_t),
- "UnwindCursor<> does not fit in unw_cursor_t");
- memset(&_info, 0, sizeof(_info));
-}
-
-template <typename A, typename R>
-UnwindCursor<A, R>::UnwindCursor(A &as, void *)
- : _addressSpace(as), _unwindInfoMissing(false), _isSignalFrame(false) {
- memset(&_info, 0, sizeof(_info));
- // FIXME
- // fill in _registers from thread arg
-}
-
-
-template <typename A, typename R>
-bool UnwindCursor<A, R>::validReg(int regNum) {
- return _registers.validRegister(regNum);
-}
-
-template <typename A, typename R>
-unw_word_t UnwindCursor<A, R>::getReg(int regNum) {
- return _registers.getRegister(regNum);
-}
-
-template <typename A, typename R>
-void UnwindCursor<A, R>::setReg(int regNum, unw_word_t value) {
- _registers.setRegister(regNum, (typename A::pint_t)value);
-}
-
-template <typename A, typename R>
-bool UnwindCursor<A, R>::validFloatReg(int regNum) {
- return _registers.validFloatRegister(regNum);
-}
-
-template <typename A, typename R>
-unw_fpreg_t UnwindCursor<A, R>::getFloatReg(int regNum) {
- return _registers.getFloatRegister(regNum);
-}
-
-template <typename A, typename R>
-void UnwindCursor<A, R>::setFloatReg(int regNum, unw_fpreg_t value) {
- _registers.setFloatRegister(regNum, value);
-}
-
-template <typename A, typename R> void UnwindCursor<A, R>::jumpto() {
- _registers.jumpto();
-}
-
-#ifdef __arm__
-template <typename A, typename R> void UnwindCursor<A, R>::saveVFPAsX() {
- _registers.saveVFPAsX();
-}
-#endif
-
-template <typename A, typename R>
-const char *UnwindCursor<A, R>::getRegisterName(int regNum) {
- return _registers.getRegisterName(regNum);
-}
-
-template <typename A, typename R> bool UnwindCursor<A, R>::isSignalFrame() {
- return _isSignalFrame;
-}
-
-#if LIBCXXABI_ARM_EHABI
-struct EHABIIndexEntry {
- uint32_t functionOffset;
- uint32_t data;
-};
-
-template<typename A>
-struct EHABISectionIterator {
- typedef EHABISectionIterator _Self;
-
- typedef std::random_access_iterator_tag iterator_category;
- typedef typename A::pint_t value_type;
- typedef typename A::pint_t* pointer;
- typedef typename A::pint_t& reference;
- typedef size_t size_type;
- typedef size_t difference_type;
-
- static _Self begin(A& addressSpace, const UnwindInfoSections& sects) {
- return _Self(addressSpace, sects, 0);
- }
- static _Self end(A& addressSpace, const UnwindInfoSections& sects) {
- return _Self(addressSpace, sects, sects.arm_section_length);
- }
-
- EHABISectionIterator(A& addressSpace, const UnwindInfoSections& sects, size_t i)
- : _i(i), _addressSpace(&addressSpace), _sects(&sects) {}
-
- _Self& operator++() { ++_i; return *this; }
- _Self& operator+=(size_t a) { _i += a; return *this; }
- _Self& operator--() { assert(_i > 0); --_i; return *this; }
- _Self& operator-=(size_t a) { assert(_i >= a); _i -= a; return *this; }
-
- _Self operator+(size_t a) { _Self out = *this; out._i += a; return out; }
- _Self operator-(size_t a) { assert(_i >= a); _Self out = *this; out._i -= a; return out; }
-
- size_t operator-(const _Self& other) { return _i - other._i; }
-
- bool operator==(const _Self& other) const {
- assert(_addressSpace == other._addressSpace);
- assert(_sects == other._sects);
- return _i == other._i;
- }
-
- typename A::pint_t operator*() const { return functionAddress(); }
-
- typename A::pint_t functionAddress() const {
- typename A::pint_t indexAddr = _sects->arm_section + arrayoffsetof(
- EHABIIndexEntry, _i, functionOffset);
- return indexAddr + signExtendPrel31(_addressSpace->get32(indexAddr));
- }
-
- typename A::pint_t dataAddress() {
- typename A::pint_t indexAddr = _sects->arm_section + arrayoffsetof(
- EHABIIndexEntry, _i, data);
- return indexAddr;
- }
-
- private:
- size_t _i;
- A* _addressSpace;
- const UnwindInfoSections* _sects;
-};
-
-template <typename A, typename R>
-bool UnwindCursor<A, R>::getInfoFromEHABISection(
- pint_t pc,
- const UnwindInfoSections &sects) {
- EHABISectionIterator<A> begin =
- EHABISectionIterator<A>::begin(_addressSpace, sects);
- EHABISectionIterator<A> end =
- EHABISectionIterator<A>::end(_addressSpace, sects);
-
- EHABISectionIterator<A> itNextPC = std::upper_bound(begin, end, pc);
- if (itNextPC == begin || itNextPC == end)
- return false;
- EHABISectionIterator<A> itThisPC = itNextPC - 1;
-
- pint_t thisPC = itThisPC.functionAddress();
- pint_t nextPC = itNextPC.functionAddress();
- pint_t indexDataAddr = itThisPC.dataAddress();
-
- if (indexDataAddr == 0)
- return false;
-
- uint32_t indexData = _addressSpace.get32(indexDataAddr);
- if (indexData == UNW_EXIDX_CANTUNWIND)
- return false;
-
- // If the high bit is set, the exception handling table entry is inline inside
- // the index table entry on the second word (aka |indexDataAddr|). Otherwise,
- // the table points at an offset in the exception handling table (section 5 EHABI).
- pint_t exceptionTableAddr;
- uint32_t exceptionTableData;
- bool isSingleWordEHT;
- if (indexData & 0x80000000) {
- exceptionTableAddr = indexDataAddr;
- // TODO(ajwong): Should this data be 0?
- exceptionTableData = indexData;
- isSingleWordEHT = true;
- } else {
- exceptionTableAddr = indexDataAddr + signExtendPrel31(indexData);
- exceptionTableData = _addressSpace.get32(exceptionTableAddr);
- isSingleWordEHT = false;
- }
-
- // Now we know the 3 things:
- // exceptionTableAddr -- exception handler table entry.
- // exceptionTableData -- the data inside the first word of the eht entry.
- // isSingleWordEHT -- whether the entry is in the index.
- unw_word_t personalityRoutine = 0xbadf00d;
- bool scope32 = false;
- uintptr_t lsda = 0xbadf00d;
-
- // If the high bit in the exception handling table entry is set, the entry is
- // in compact form (section 6.3 EHABI).
- if (exceptionTableData & 0x80000000) {
- // Grab the index of the personality routine from the compact form.
- uint32_t choice = (exceptionTableData & 0x0f000000) >> 24;
- uint32_t extraWords = 0;
- switch (choice) {
- case 0:
- personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr0;
- extraWords = 0;
- scope32 = false;
- break;
- case 1:
- personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr1;
- extraWords = (exceptionTableData & 0x00ff0000) >> 16;
- scope32 = false;
- break;
- case 2:
- personalityRoutine = (unw_word_t) &__aeabi_unwind_cpp_pr2;
- extraWords = (exceptionTableData & 0x00ff0000) >> 16;
- scope32 = true;
- break;
- default:
- _LIBUNWIND_ABORT("unknown personality routine");
- return false;
- }
-
- if (isSingleWordEHT) {
- if (extraWords != 0) {
- _LIBUNWIND_ABORT("index inlined table detected but pr function "
- "requires extra words");
- return false;
- }
- }
- } else {
- pint_t personalityAddr =
- exceptionTableAddr + signExtendPrel31(exceptionTableData);
- personalityRoutine = personalityAddr;
-
- // ARM EHABI # 6.2, # 9.2
- //
- // +---- ehtp
- // v
- // +--------------------------------------+
- // | +--------+--------+--------+-------+ |
- // | |0| prel31 to personalityRoutine | |
- // | +--------+--------+--------+-------+ |
- // | | N | unwind opcodes | | <-- UnwindData
- // | +--------+--------+--------+-------+ |
- // | | Word 2 unwind opcodes | |
- // | +--------+--------+--------+-------+ |
- // | ... |
- // | +--------+--------+--------+-------+ |
- // | | Word N unwind opcodes | |
- // | +--------+--------+--------+-------+ |
- // | | LSDA | | <-- lsda
- // | | ... | |
- // | +--------+--------+--------+-------+ |
- // +--------------------------------------+
-
- uint32_t *UnwindData = reinterpret_cast<uint32_t*>(exceptionTableAddr) + 1;
- uint32_t FirstDataWord = *UnwindData;
- size_t N = ((FirstDataWord >> 24) & 0xff);
- size_t NDataWords = N + 1;
- lsda = reinterpret_cast<uintptr_t>(UnwindData + NDataWords);
- }
-
- _info.start_ip = thisPC;
- _info.end_ip = nextPC;
- _info.handler = personalityRoutine;
- _info.unwind_info = exceptionTableAddr;
- _info.lsda = lsda;
- // flags is pr_cache.additional. See EHABI #7.2 for definition of bit 0.
- _info.flags = isSingleWordEHT ? 1 : 0 | scope32 ? 0x2 : 0; // Use enum?
-
- return true;
-}
-#endif
-
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
-template <typename A, typename R>
-bool UnwindCursor<A, R>::getInfoFromDwarfSection(pint_t pc,
- const UnwindInfoSections &sects,
- uint32_t fdeSectionOffsetHint) {
- typename CFI_Parser<A>::FDE_Info fdeInfo;
- typename CFI_Parser<A>::CIE_Info cieInfo;
- bool foundFDE = false;
- bool foundInCache = false;
- // If compact encoding table gave offset into dwarf section, go directly there
- if (fdeSectionOffsetHint != 0) {
- foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section,
- (uint32_t)sects.dwarf_section_length,
- sects.dwarf_section + fdeSectionOffsetHint,
- &fdeInfo, &cieInfo);
- }
-#if _LIBUNWIND_SUPPORT_DWARF_INDEX
- if (!foundFDE && (sects.dwarf_index_section != 0)) {
- foundFDE = EHHeaderParser<A>::findFDE(
- _addressSpace, pc, sects.dwarf_index_section,
- (uint32_t)sects.dwarf_index_section_length, &fdeInfo, &cieInfo);
- }
-#endif
- if (!foundFDE) {
- // otherwise, search cache of previously found FDEs.
- pint_t cachedFDE = DwarfFDECache<A>::findFDE(sects.dso_base, pc);
- if (cachedFDE != 0) {
- foundFDE =
- CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section,
- (uint32_t)sects.dwarf_section_length,
- cachedFDE, &fdeInfo, &cieInfo);
- foundInCache = foundFDE;
- }
- }
- if (!foundFDE) {
- // Still not found, do full scan of __eh_frame section.
- foundFDE = CFI_Parser<A>::findFDE(_addressSpace, pc, sects.dwarf_section,
- (uint32_t)sects.dwarf_section_length, 0,
- &fdeInfo, &cieInfo);
- }
- if (foundFDE) {
- typename CFI_Parser<A>::PrologInfo prolog;
- if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo, pc,
- &prolog)) {
- // Save off parsed FDE info
- _info.start_ip = fdeInfo.pcStart;
- _info.end_ip = fdeInfo.pcEnd;
- _info.lsda = fdeInfo.lsda;
- _info.handler = cieInfo.personality;
- _info.gp = prolog.spExtraArgSize;
- _info.flags = 0;
- _info.format = dwarfEncoding();
- _info.unwind_info = fdeInfo.fdeStart;
- _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength;
- _info.extra = (unw_word_t) sects.dso_base;
-
- // Add to cache (to make next lookup faster) if we had no hint
- // and there was no index.
- if (!foundInCache && (fdeSectionOffsetHint == 0)) {
- #if _LIBUNWIND_SUPPORT_DWARF_INDEX
- if (sects.dwarf_index_section == 0)
- #endif
- DwarfFDECache<A>::add(sects.dso_base, fdeInfo.pcStart, fdeInfo.pcEnd,
- fdeInfo.fdeStart);
- }
- return true;
- }
- }
- //_LIBUNWIND_DEBUG_LOG("can't find/use FDE for pc=0x%llX\n", (uint64_t)pc);
- return false;
-}
-#endif // _LIBUNWIND_SUPPORT_DWARF_UNWIND
-
-
-#if _LIBUNWIND_SUPPORT_COMPACT_UNWIND
-template <typename A, typename R>
-bool UnwindCursor<A, R>::getInfoFromCompactEncodingSection(pint_t pc,
- const UnwindInfoSections &sects) {
- const bool log = false;
- if (log)
- fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX, mh=0x%llX)\n",
- (uint64_t)pc, (uint64_t)sects.dso_base);
-
- const UnwindSectionHeader<A> sectionHeader(_addressSpace,
- sects.compact_unwind_section);
- if (sectionHeader.version() != UNWIND_SECTION_VERSION)
- return false;
-
- // do a binary search of top level index to find page with unwind info
- pint_t targetFunctionOffset = pc - sects.dso_base;
- const UnwindSectionIndexArray<A> topIndex(_addressSpace,
- sects.compact_unwind_section
- + sectionHeader.indexSectionOffset());
- uint32_t low = 0;
- uint32_t high = sectionHeader.indexCount();
- uint32_t last = high - 1;
- while (low < high) {
- uint32_t mid = (low + high) / 2;
- //if ( log ) fprintf(stderr, "\tmid=%d, low=%d, high=%d, *mid=0x%08X\n",
- //mid, low, high, topIndex.functionOffset(mid));
- if (topIndex.functionOffset(mid) <= targetFunctionOffset) {
- if ((mid == last) ||
- (topIndex.functionOffset(mid + 1) > targetFunctionOffset)) {
- low = mid;
- break;
- } else {
- low = mid + 1;
- }
- } else {
- high = mid;
- }
- }
- const uint32_t firstLevelFunctionOffset = topIndex.functionOffset(low);
- const uint32_t firstLevelNextPageFunctionOffset =
- topIndex.functionOffset(low + 1);
- const pint_t secondLevelAddr =
- sects.compact_unwind_section + topIndex.secondLevelPagesSectionOffset(low);
- const pint_t lsdaArrayStartAddr =
- sects.compact_unwind_section + topIndex.lsdaIndexArraySectionOffset(low);
- const pint_t lsdaArrayEndAddr =
- sects.compact_unwind_section + topIndex.lsdaIndexArraySectionOffset(low+1);
- if (log)
- fprintf(stderr, "\tfirst level search for result index=%d "
- "to secondLevelAddr=0x%llX\n",
- low, (uint64_t) secondLevelAddr);
- // do a binary search of second level page index
- uint32_t encoding = 0;
- pint_t funcStart = 0;
- pint_t funcEnd = 0;
- pint_t lsda = 0;
- pint_t personality = 0;
- uint32_t pageKind = _addressSpace.get32(secondLevelAddr);
- if (pageKind == UNWIND_SECOND_LEVEL_REGULAR) {
- // regular page
- UnwindSectionRegularPageHeader<A> pageHeader(_addressSpace,
- secondLevelAddr);
- UnwindSectionRegularArray<A> pageIndex(
- _addressSpace, secondLevelAddr + pageHeader.entryPageOffset());
- // binary search looks for entry with e where index[e].offset <= pc <
- // index[e+1].offset
- if (log)
- fprintf(stderr, "\tbinary search for targetFunctionOffset=0x%08llX in "
- "regular page starting at secondLevelAddr=0x%llX\n",
- (uint64_t) targetFunctionOffset, (uint64_t) secondLevelAddr);
- low = 0;
- high = pageHeader.entryCount();
- while (low < high) {
- uint32_t mid = (low + high) / 2;
- if (pageIndex.functionOffset(mid) <= targetFunctionOffset) {
- if (mid == (uint32_t)(pageHeader.entryCount() - 1)) {
- // at end of table
- low = mid;
- funcEnd = firstLevelNextPageFunctionOffset + sects.dso_base;
- break;
- } else if (pageIndex.functionOffset(mid + 1) > targetFunctionOffset) {
- // next is too big, so we found it
- low = mid;
- funcEnd = pageIndex.functionOffset(low + 1) + sects.dso_base;
- break;
- } else {
- low = mid + 1;
- }
- } else {
- high = mid;
- }
- }
- encoding = pageIndex.encoding(low);
- funcStart = pageIndex.functionOffset(low) + sects.dso_base;
- if (pc < funcStart) {
- if (log)
- fprintf(
- stderr,
- "\tpc not in table, pc=0x%llX, funcStart=0x%llX, funcEnd=0x%llX\n",
- (uint64_t) pc, (uint64_t) funcStart, (uint64_t) funcEnd);
- return false;
- }
- if (pc > funcEnd) {
- if (log)
- fprintf(
- stderr,
- "\tpc not in table, pc=0x%llX, funcStart=0x%llX, funcEnd=0x%llX\n",
- (uint64_t) pc, (uint64_t) funcStart, (uint64_t) funcEnd);
- return false;
- }
- } else if (pageKind == UNWIND_SECOND_LEVEL_COMPRESSED) {
- // compressed page
- UnwindSectionCompressedPageHeader<A> pageHeader(_addressSpace,
- secondLevelAddr);
- UnwindSectionCompressedArray<A> pageIndex(
- _addressSpace, secondLevelAddr + pageHeader.entryPageOffset());
- const uint32_t targetFunctionPageOffset =
- (uint32_t)(targetFunctionOffset - firstLevelFunctionOffset);
- // binary search looks for entry with e where index[e].offset <= pc <
- // index[e+1].offset
- if (log)
- fprintf(stderr, "\tbinary search of compressed page starting at "
- "secondLevelAddr=0x%llX\n",
- (uint64_t) secondLevelAddr);
- low = 0;
- last = pageHeader.entryCount() - 1;
- high = pageHeader.entryCount();
- while (low < high) {
- uint32_t mid = (low + high) / 2;
- if (pageIndex.functionOffset(mid) <= targetFunctionPageOffset) {
- if ((mid == last) ||
- (pageIndex.functionOffset(mid + 1) > targetFunctionPageOffset)) {
- low = mid;
- break;
- } else {
- low = mid + 1;
- }
- } else {
- high = mid;
- }
- }
- funcStart = pageIndex.functionOffset(low) + firstLevelFunctionOffset
- + sects.dso_base;
- if (low < last)
- funcEnd =
- pageIndex.functionOffset(low + 1) + firstLevelFunctionOffset
- + sects.dso_base;
- else
- funcEnd = firstLevelNextPageFunctionOffset + sects.dso_base;
- if (pc < funcStart) {
- _LIBUNWIND_DEBUG_LOG("malformed __unwind_info, pc=0x%llX not in second "
- "level compressed unwind table. funcStart=0x%llX\n",
- (uint64_t) pc, (uint64_t) funcStart);
- return false;
- }
- if (pc > funcEnd) {
- _LIBUNWIND_DEBUG_LOG("malformed __unwind_info, pc=0x%llX not in second "
- "level compressed unwind table. funcEnd=0x%llX\n",
- (uint64_t) pc, (uint64_t) funcEnd);
- return false;
- }
- uint16_t encodingIndex = pageIndex.encodingIndex(low);
- if (encodingIndex < sectionHeader.commonEncodingsArrayCount()) {
- // encoding is in common table in section header
- encoding = _addressSpace.get32(
- sects.compact_unwind_section +
- sectionHeader.commonEncodingsArraySectionOffset() +
- encodingIndex * sizeof(uint32_t));
- } else {
- // encoding is in page specific table
- uint16_t pageEncodingIndex =
- encodingIndex - (uint16_t)sectionHeader.commonEncodingsArrayCount();
- encoding = _addressSpace.get32(secondLevelAddr +
- pageHeader.encodingsPageOffset() +
- pageEncodingIndex * sizeof(uint32_t));
- }
- } else {
- _LIBUNWIND_DEBUG_LOG("malformed __unwind_info at 0x%0llX bad second "
- "level page\n",
- (uint64_t) sects.compact_unwind_section);
- return false;
- }
-
- // look up LSDA, if encoding says function has one
- if (encoding & UNWIND_HAS_LSDA) {
- UnwindSectionLsdaArray<A> lsdaIndex(_addressSpace, lsdaArrayStartAddr);
- uint32_t funcStartOffset = (uint32_t)(funcStart - sects.dso_base);
- low = 0;
- high = (uint32_t)(lsdaArrayEndAddr - lsdaArrayStartAddr) /
- sizeof(unwind_info_section_header_lsda_index_entry);
- // binary search looks for entry with exact match for functionOffset
- if (log)
- fprintf(stderr,
- "\tbinary search of lsda table for targetFunctionOffset=0x%08X\n",
- funcStartOffset);
- while (low < high) {
- uint32_t mid = (low + high) / 2;
- if (lsdaIndex.functionOffset(mid) == funcStartOffset) {
- lsda = lsdaIndex.lsdaOffset(mid) + sects.dso_base;
- break;
- } else if (lsdaIndex.functionOffset(mid) < funcStartOffset) {
- low = mid + 1;
- } else {
- high = mid;
- }
- }
- if (lsda == 0) {
- _LIBUNWIND_DEBUG_LOG("found encoding 0x%08X with HAS_LSDA bit set for "
- "pc=0x%0llX, but lsda table has no entry\n",
- encoding, (uint64_t) pc);
- return false;
- }
- }
-
- // extact personality routine, if encoding says function has one
- uint32_t personalityIndex = (encoding & UNWIND_PERSONALITY_MASK) >>
- (__builtin_ctz(UNWIND_PERSONALITY_MASK));
- if (personalityIndex != 0) {
- --personalityIndex; // change 1-based to zero-based index
- if (personalityIndex > sectionHeader.personalityArrayCount()) {
- _LIBUNWIND_DEBUG_LOG("found encoding 0x%08X with personality index %d, "
- "but personality table has only %d entires\n",
- encoding, personalityIndex,
- sectionHeader.personalityArrayCount());
- return false;
- }
- int32_t personalityDelta = (int32_t)_addressSpace.get32(
- sects.compact_unwind_section +
- sectionHeader.personalityArraySectionOffset() +
- personalityIndex * sizeof(uint32_t));
- pint_t personalityPointer = sects.dso_base + (pint_t)personalityDelta;
- personality = _addressSpace.getP(personalityPointer);
- if (log)
- fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX), "
- "personalityDelta=0x%08X, personality=0x%08llX\n",
- (uint64_t) pc, personalityDelta, (uint64_t) personality);
- }
-
- if (log)
- fprintf(stderr, "getInfoFromCompactEncodingSection(pc=0x%llX), "
- "encoding=0x%08X, lsda=0x%08llX for funcStart=0x%llX\n",
- (uint64_t) pc, encoding, (uint64_t) lsda, (uint64_t) funcStart);
- _info.start_ip = funcStart;
- _info.end_ip = funcEnd;
- _info.lsda = lsda;
- _info.handler = personality;
- _info.gp = 0;
- _info.flags = 0;
- _info.format = encoding;
- _info.unwind_info = 0;
- _info.unwind_info_size = 0;
- _info.extra = sects.dso_base;
- return true;
-}
-#endif // _LIBUNWIND_SUPPORT_COMPACT_UNWIND
-
-
-template <typename A, typename R>
-void UnwindCursor<A, R>::setInfoBasedOnIPRegister(bool isReturnAddress) {
- pint_t pc = (pint_t)this->getReg(UNW_REG_IP);
-#if LIBCXXABI_ARM_EHABI
- // Remove the thumb bit so the IP represents the actual instruction address.
- // This matches the behaviour of _Unwind_GetIP on arm.
- pc &= (pint_t)~0x1;
-#endif
-
- // If the last line of a function is a "throw" the compiler sometimes
- // emits no instructions after the call to __cxa_throw. This means
- // the return address is actually the start of the next function.
- // To disambiguate this, back up the pc when we know it is a return
- // address.
- if (isReturnAddress)
- --pc;
-
- // Ask address space object to find unwind sections for this pc.
- UnwindInfoSections sects;
- if (_addressSpace.findUnwindSections(pc, sects)) {
-#if _LIBUNWIND_SUPPORT_COMPACT_UNWIND
- // If there is a compact unwind encoding table, look there first.
- if (sects.compact_unwind_section != 0) {
- if (this->getInfoFromCompactEncodingSection(pc, sects)) {
- #if _LIBUNWIND_SUPPORT_DWARF_UNWIND
- // Found info in table, done unless encoding says to use dwarf.
- uint32_t dwarfOffset;
- if ((sects.dwarf_section != 0) && compactSaysUseDwarf(&dwarfOffset)) {
- if (this->getInfoFromDwarfSection(pc, sects, dwarfOffset)) {
- // found info in dwarf, done
- return;
- }
- }
- #endif
- // If unwind table has entry, but entry says there is no unwind info,
- // record that we have no unwind info.
- if (_info.format == 0)
- _unwindInfoMissing = true;
- return;
- }
- }
-#endif // _LIBUNWIND_SUPPORT_COMPACT_UNWIND
-
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
- // If there is dwarf unwind info, look there next.
- if (sects.dwarf_section != 0) {
- if (this->getInfoFromDwarfSection(pc, sects)) {
- // found info in dwarf, done
- return;
- }
- }
-#endif
-
-#if LIBCXXABI_ARM_EHABI
- // If there is ARM EHABI unwind info, look there next.
- if (sects.arm_section != 0 && this->getInfoFromEHABISection(pc, sects))
- return;
-#endif
- }
-
-#if _LIBUNWIND_SUPPORT_DWARF_UNWIND
- // There is no static unwind info for this pc. Look to see if an FDE was
- // dynamically registered for it.
- pint_t cachedFDE = DwarfFDECache<A>::findFDE(0, pc);
- if (cachedFDE != 0) {
- CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo;
- CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo;
- const char *msg = CFI_Parser<A>::decodeFDE(_addressSpace,
- cachedFDE, &fdeInfo, &cieInfo);
- if (msg == NULL) {
- typename CFI_Parser<A>::PrologInfo prolog;
- if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo, cieInfo,
- pc, &prolog)) {
- // save off parsed FDE info
- _info.start_ip = fdeInfo.pcStart;
- _info.end_ip = fdeInfo.pcEnd;
- _info.lsda = fdeInfo.lsda;
- _info.handler = cieInfo.personality;
- _info.gp = prolog.spExtraArgSize;
- // Some frameless functions need SP
- // altered when resuming in function.
- _info.flags = 0;
- _info.format = dwarfEncoding();
- _info.unwind_info = fdeInfo.fdeStart;
- _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength;
- _info.extra = 0;
- return;
- }
- }
- }
-
- // Lastly, ask AddressSpace object about platform specific ways to locate
- // other FDEs.
- pint_t fde;
- if (_addressSpace.findOtherFDE(pc, fde)) {
- CFI_Parser<LocalAddressSpace>::FDE_Info fdeInfo;
- CFI_Parser<LocalAddressSpace>::CIE_Info cieInfo;
- if (!CFI_Parser<A>::decodeFDE(_addressSpace, fde, &fdeInfo, &cieInfo)) {
- // Double check this FDE is for a function that includes the pc.
- if ((fdeInfo.pcStart <= pc) && (pc < fdeInfo.pcEnd)) {
- typename CFI_Parser<A>::PrologInfo prolog;
- if (CFI_Parser<A>::parseFDEInstructions(_addressSpace, fdeInfo,
- cieInfo, pc, &prolog)) {
- // save off parsed FDE info
- _info.start_ip = fdeInfo.pcStart;
- _info.end_ip = fdeInfo.pcEnd;
- _info.lsda = fdeInfo.lsda;
- _info.handler = cieInfo.personality;
- _info.gp = prolog.spExtraArgSize;
- _info.flags = 0;
- _info.format = dwarfEncoding();
- _info.unwind_info = fdeInfo.fdeStart;
- _info.unwind_info_size = (uint32_t)fdeInfo.fdeLength;
- _info.extra = 0;
- return;
- }
- }
- }
- }
-#endif // #if _LIBUNWIND_SUPPORT_DWARF_UNWIND
-
- // no unwind info, flag that we can't reliably unwind
- _unwindInfoMissing = true;
-}
-
-template <typename A, typename R>
-int UnwindCursor<A, R>::step() {
- // Bottom of stack is defined is when unwind info cannot be found.
- if (_unwindInfoMissing)
- return UNW_STEP_END;
-
- // Use unwinding info to modify register set as if function returned.
- int result;
-#if _LIBUNWIND_SUPPORT_COMPACT_UNWIND
- result = this->stepWithCompactEncoding();
-#elif _LIBUNWIND_SUPPORT_DWARF_UNWIND
- result = this->stepWithDwarfFDE();
-#elif LIBCXXABI_ARM_EHABI
- result = UNW_STEP_SUCCESS;
-#else
- #error Need _LIBUNWIND_SUPPORT_COMPACT_UNWIND or \
- _LIBUNWIND_SUPPORT_DWARF_UNWIND or \
- LIBCXXABI_ARM_EHABI
-#endif
-
- // update info based on new PC
- if (result == UNW_STEP_SUCCESS) {
- this->setInfoBasedOnIPRegister(true);
- if (_unwindInfoMissing)
- return UNW_STEP_END;
- if (_info.gp)
- setReg(UNW_REG_SP, getReg(UNW_REG_SP) + _info.gp);
- }
-
- return result;
-}
-
-template <typename A, typename R>
-void UnwindCursor<A, R>::getInfo(unw_proc_info_t *info) {
- *info = _info;
-}
-
-template <typename A, typename R>
-bool UnwindCursor<A, R>::getFunctionName(char *buf, size_t bufLen,
- unw_word_t *offset) {
- return _addressSpace.findFunctionName((pint_t)this->getReg(UNW_REG_IP),
- buf, bufLen, offset);
-}
-
-} // namespace libunwind
-
-#endif // __UNWINDCURSOR_HPP__
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