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Fix dump_syms memory leak

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It moves InlineOriginMap to module.h. Let Module keeps the global InlineOriginMap to easily get all referenced InlineOrigin when emitting. And release allocated memory inside its destructor.

Verified that the symbol file with inline records for chrome is the same before and after this change.

Change-Id: I7541aa05d3d2df0b9d52d670cab58241baecf20d
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/3171638
Reviewed-by: Joshua Peraza <jperaza@chromium.org>
This commit is contained in:
Zequan Wu
2021-09-24 13:27:13 -07:00
committed by Joshua Peraza
parent 1147c2fcf0
commit 1816ae7f35
3 changed files with 116 additions and 91 deletions
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79
src/common/dwarf_cu_to_module.cc
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@@ -100,71 +100,6 @@ struct AbstractOrigin {
typedef map<uint64_t, AbstractOrigin> AbstractOriginByOffset;
using InlineOriginByOffset = map<uint64_t, Module::InlineOrigin*>;
class InlineOriginMap {
public:
Module::InlineOrigin* GetOrCreateInlineOrigin(uint64_t offset,
const string& name) {
uint64_t specification_offset = references_[offset];
if (inline_origins_.find(specification_offset) != inline_origins_.end()) {
if (inline_origins_[specification_offset]->name == "<name omitted>") {
inline_origins_[specification_offset]->name = name;
}
return inline_origins_[specification_offset];
}
inline_origins_[specification_offset] = new Module::InlineOrigin(name);
return inline_origins_[specification_offset];
}
// offset is the offset of a DW_TAG_subprogram. specification_offset is the
// value of its DW_AT_specification or equals to offset if DW_AT_specification
// doesn't exist in that DIE.
void SetReference(uint64_t offset, uint64_t specification_offset) {
// If we haven't seen this doesn't exist in reference map, always add it.
if (references_.find(offset) == references_.end()) {
references_[offset] = specification_offset;
return;
}
// If offset equals specification_offset and offset exists in references_,
// there is no need to update the references_ map. This early return is
// necessary because the call to erase in following if will remove the entry
// of specification_offset in inline_origins_.
// If specification_offset equals to references_[offset], it might be
// duplicate debug info.
if (offset == specification_offset ||
specification_offset == references_[offset])
return;
// Fix up mapping in inline_origins_.
auto remove = inline_origins_.find(references_[offset]);
if (remove != inline_origins_.end()) {
inline_origins_[specification_offset] = remove->second;
inline_origins_.erase(remove);
}
references_[offset] = specification_offset;
}
void AssignFilesToInlineOrigins(vector<uint64_t>& inline_origin_offsets,
Module::File* file) {
for (uint64_t offset : inline_origin_offsets)
if (references_.find(offset) != references_.end()) {
auto origin = inline_origins_.find(references_[offset]);
if (origin != inline_origins_.end())
origin->second->file = file;
}
}
private:
// A map from a DW_TAG_subprogram's offset to the DW_TAG_subprogram.
InlineOriginByOffset inline_origins_;
// A map from a DW_TAG_subprogram's offset to the offset of its specification
// or abstract origin subprogram. The set of values in this map should always
// be the same set of keys in inline_origins_.
map<uint64_t, uint64_t> references_;
};
// Data global to the DWARF-bearing file that is private to the
// DWARF-to-Module process.
struct DwarfCUToModule::FilePrivate {
@@ -197,8 +132,6 @@ struct DwarfCUToModule::FilePrivate {
// Keep a list of forward references from DW_AT_abstract_origin and
// DW_AT_specification attributes so names can be fixed up.
std::map<uint64_t, Module::Function*> forward_ref_die_to_func;
InlineOriginMap inline_origin_map;
};
DwarfCUToModule::FileContext::FileContext(const string& filename,
@@ -751,10 +684,10 @@ void DwarfCUToModule::InlineHandler::Finish() {
// Every DW_TAG_inlined_subroutine should have a DW_AT_abstract_origin.
assert(specification_offset_ != 0);
cu_context_->file_context->file_private_->inline_origin_map.SetReference(
cu_context_->file_context->module_->inline_origin_map.SetReference(
specification_offset_, specification_offset_);
Module::InlineOrigin* origin =
cu_context_->file_context->file_private_->inline_origin_map
cu_context_->file_context->module_->inline_origin_map
.GetOrCreateInlineOrigin(specification_offset_, name_);
unique_ptr<Module::Inline> in(
new Module::Inline(origin, ranges, call_site_line_, inline_nest_level_,
@@ -956,9 +889,9 @@ void DwarfCUToModule::FuncHandler::Finish() {
(!empty_range || inline_ || decl_file_data_ != UINT64_MAX)) {
uint64_t offset =
specification_offset_ != 0 ? specification_offset_ : offset_;
cu_context_->file_context->file_private_->inline_origin_map.SetReference(
offset_, offset);
cu_context_->file_context->file_private_->inline_origin_map
cu_context_->file_context->module_->inline_origin_map.SetReference(offset_,
offset);
cu_context_->file_context->module_->inline_origin_map
.GetOrCreateInlineOrigin(offset_,
name_.empty() ? "<name omitted>" : name_);
if (decl_file_data_ != UINT64_MAX)
@@ -1546,7 +1479,7 @@ void DwarfCUToModule::AssignLinesToFunctions() {
void DwarfCUToModule::AssignFilesToInlines() {
for (auto iter : files_) {
cu_context_->file_context->file_private_->inline_origin_map
cu_context_->file_context->module_->inline_origin_map
.AssignFilesToInlineOrigins(cu_context_->inline_origins[iter.first],
iter.second);
}