Suyu/breakpad
1
0
Fork 0
mirror of https://git.suyu.dev/suyu/breakpad.git synced 2025-12-31 03:37:44 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

Fix reading DW_AT_ranges in split dwarf.

Browse source 
Bug: b/280290608, chromium:1448979
Change-Id: I3f9e4c3d62b4c858238ccbbda0366926c306e27f
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/4568824
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
This commit is contained in:
Zequan Wu 2023-05-25 15:40:44 -04:00 • committed by Joshua Peraza
parent 6857c7c65f
commit 02fe1eef8e
7 changed files with 86 additions and 52 deletions
Download patch file Download diff file Expand all files Collapse all files

29
src/common/dwarf/dwarf2reader.cc
View file

@ -80,7 +80,7 @@ CompilationUnit::CompilationUnit(const string& path,
str_offsets_buffer_(NULL), str_offsets_buffer_length_(0),
addr_buffer_(NULL), addr_buffer_length_(0),
is_split_dwarf_(false), is_type_unit_(false), dwo_id_(0), dwo_name_(),
skeleton_dwo_id_(0), ranges_base_(0), addr_base_(0),
skeleton_dwo_id_(0), addr_base_(0),
str_offsets_base_(0), have_checked_for_dwp_(false),
should_process_split_dwarf_(false) {}
@ -91,16 +91,11 @@ CompilationUnit::CompilationUnit(const string& path,
// the executable file, and call it as if we were still
// processing the original compilation unit.
void CompilationUnit::SetSplitDwarf(const uint8_t* addr_buffer,
uint64_t addr_buffer_length,
void CompilationUnit::SetSplitDwarf(
uint64_t addr_base,
uint64_t ranges_base,
uint64_t dwo_id) {
is_split_dwarf_ = true;
addr_buffer_ = addr_buffer;
addr_buffer_length_ = addr_buffer_length;
addr_base_ = addr_base;
ranges_base_ = ranges_base;
skeleton_dwo_id_ = dwo_id;
}
@ -889,7 +884,9 @@ const uint8_t* CompilationUnit::ProcessDIE(uint64_t dieoffset,
// DW_AT_str_offsets_base or DW_AT_addr_base. If it does, that attribute must
// be found and processed before trying to process the other attributes;
// otherwise the string or address values will all come out incorrect.
if (abbrev.tag == DW_TAG_compile_unit && header_.version == 5) {
if ((abbrev.tag == DW_TAG_compile_unit ||
abbrev.tag == DW_TAG_skeleton_unit) &&
header_.version == 5) {
uint64_t dieoffset_copy = dieoffset;
const uint8_t* start_copy = start;
for (AttributeList::const_iterator i = abbrev.attributes.begin();
@ -1016,7 +1013,8 @@ bool CompilationUnit::ProcessSplitDwarf(std::string& split_file,
string debug_suffix(".debug");
dwp_path = path_;
size_t found = path_.rfind(debug_suffix);
if (found + debug_suffix.length() == path_.length())
if (found != string::npos &&
found + debug_suffix.length() == path_.length())
dwp_path = dwp_path.replace(found, debug_suffix.length(), dwp_suffix);
}
if (stat(dwp_path.c_str(), &statbuf) == 0) {
@ -1133,6 +1131,8 @@ void DwpReader::Initialize() {
info_data_ = elf_reader_->GetSectionByName(".debug_info.dwo", &info_size_);
str_offsets_data_ = elf_reader_->GetSectionByName(".debug_str_offsets.dwo",
&str_offsets_size_);
rnglist_data_ =
elf_reader_->GetSectionByName(".debug_rnglists.dwo", &rnglist_size_);
if (size_table_ >= cu_index_ + cu_index_size_) {
version_ = 0;
}
@ -1245,6 +1245,12 @@ void DwpReader::ReadDebugSectionsForCU(uint64_t dwo_id,
".debug_str_offsets",
std::make_pair(reinterpret_cast<const uint8_t*> (str_offsets_data_)
+ offset, size)));
} else if (section_id == DW_SECT_RNGLISTS) {
sections->insert(std::make_pair(
".debug_rnglists",
std::make_pair(
reinterpret_cast<const uint8_t*>(rnglist_data_) + offset,
size)));
}
}
sections->insert(std::make_pair(
@ -1830,6 +1836,11 @@ bool RangeListReader::ReadRanges(enum DwarfForm form, uint64_t data) {
return ReadDebugRngList(data);
}
} else if (form == DW_FORM_rnglistx) {
if (cu_info_->ranges_base_ == 0) {
// In split dwarf, there's no DW_AT_rnglists_base attribute, range_base
// will just be the first byte after the header.
cu_info_->ranges_base_ = reader_->OffsetSize() == 4? 12: 20;
}
offset_array_ = cu_info_->ranges_base_;
uint64_t index_offset = reader_->OffsetSize() * data;
uint64_t range_list_offset =