Use -d flag enable procecessing DW_TAG_inlined_subroutine

This change makes sure dump_syms process DW_TAG_inlined_subroutine only when -d flag is given, which save memory and time when -d is not given. Before this, it always processes DW_TAG_inlined_subroutine and -d determines whether or not to emit INLINE records.

Bug: chromium:1250351, chromium:1246974
Change-Id: I54725ba1e513cafe17268ca389ff8acc9c11b25e
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/3166674
Reviewed-by: Joshua Peraza <jperaza@chromium.org>

src/common/dwarf/dwarf2diehandler.h

@@ -258,10 +258,13 @@ class DIEHandler {
 
 // A subclass of DIEHandler, with additional kludges for handling the
 // compilation unit's root die.
-class RootDIEHandler: public DIEHandler {
+class RootDIEHandler : public DIEHandler {
  public:
-  RootDIEHandler() { }
+  bool handle_inline;
-  virtual ~RootDIEHandler() { }
+
+  explicit RootDIEHandler(bool handle_inline = false)
+      : handle_inline(handle_inline) {}
+  virtual ~RootDIEHandler() {}
 
   // We pass the values reported via Dwarf2Handler::StartCompilationUnit
   // to this member function, and skip the entire compilation unit if it

src/common/dwarf_cu_to_module.cc

@@ -766,11 +766,12 @@ void DwarfCUToModule::InlineHandler::Finish() {
 class DwarfCUToModule::FuncHandler: public GenericDIEHandler {
  public:
   FuncHandler(CUContext* cu_context, DIEContext* parent_context,
-              uint64_t offset)
+              uint64_t offset, bool handle_inline)
       : GenericDIEHandler(cu_context, parent_context, offset),
         low_pc_(0), high_pc_(0), high_pc_form_(DW_FORM_addr),
         ranges_form_(DW_FORM_sec_offset), ranges_data_(0),
-        decl_file_data_(UINT64_MAX), inline_(false) { }
+        decl_file_data_(UINT64_MAX), inline_(false), 
+        handle_inline_(handle_inline) { }
 
   void ProcessAttributeUnsigned(enum DwarfAttribute attr,
                                 enum DwarfForm form,
@@ -794,6 +795,7 @@ class DwarfCUToModule::FuncHandler: public GenericDIEHandler {
   uint64_t decl_file_data_;
   bool inline_;
   vector<unique_ptr<Module::Inline>> child_inlines_;
+  bool handle_inline_;
 };
 
 void DwarfCUToModule::FuncHandler::ProcessAttributeUnsigned(
@@ -844,6 +846,7 @@ DIEHandler* DwarfCUToModule::FuncHandler::FindChildHandler(
     enum DwarfTag tag) {
   switch (tag) {
     case DW_TAG_inlined_subroutine:
+      if (handle_inline_)
         return new InlineHandler(cu_context_, new DIEContext(), offset, 0,
                                  child_inlines_);
     default:
@@ -949,7 +952,8 @@ void DwarfCUToModule::FuncHandler::Finish() {
 
   // Only keep track of DW_TAG_subprogram which have the attributes we are
   // interested.
-  if (!empty_range || inline_ || decl_file_data_ != UINT64_MAX) {
+  if (handle_inline_ &&
+      (!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(
@@ -967,13 +971,14 @@ void DwarfCUToModule::FuncHandler::Finish() {
 class DwarfCUToModule::NamedScopeHandler: public GenericDIEHandler {
  public:
   NamedScopeHandler(CUContext* cu_context, DIEContext* parent_context,
-                    uint64_t offset)
+                    uint64_t offset, bool handle_inline)
       : GenericDIEHandler(cu_context, parent_context, offset) { }
   bool EndAttributes();
   DIEHandler* FindChildHandler(uint64_t offset, enum DwarfTag tag);
 
  private:
   DIEContext child_context_; // A context for our children.
+  bool handle_inline_;
 };
 
 bool DwarfCUToModule::NamedScopeHandler::EndAttributes() {
@@ -986,12 +991,14 @@ DIEHandler* DwarfCUToModule::NamedScopeHandler::FindChildHandler(
     enum DwarfTag tag) {
   switch (tag) {
     case DW_TAG_subprogram:
-      return new FuncHandler(cu_context_, &child_context_, offset);
+      return new FuncHandler(cu_context_, &child_context_, offset,
+                             handle_inline_);
     case DW_TAG_namespace:
     case DW_TAG_class_type:
     case DW_TAG_structure_type:
     case DW_TAG_union_type:
-      return new NamedScopeHandler(cu_context_, &child_context_, offset);
+      return new NamedScopeHandler(cu_context_, &child_context_, offset,
+                                   handle_inline_);
     default:
       return NULL;
   }
@@ -1101,12 +1108,13 @@ void DwarfCUToModule::WarningReporter::MissingRanges() {
 DwarfCUToModule::DwarfCUToModule(FileContext* file_context,
                                  LineToModuleHandler* line_reader,
                                  RangesHandler* ranges_handler,
-                                 WarningReporter* reporter)
+                                 WarningReporter* reporter,
-    : line_reader_(line_reader),
+                                 bool handle_inline)
+    : RootDIEHandler(handle_inline),
+      line_reader_(line_reader),
       cu_context_(new CUContext(file_context, reporter, ranges_handler)),
       child_context_(new DIEContext()),
-      has_source_line_info_(false) {
+      has_source_line_info_(false) {}
-}
 
 DwarfCUToModule::~DwarfCUToModule() {
 }
@@ -1183,14 +1191,15 @@ DIEHandler* DwarfCUToModule::FindChildHandler(
     enum DwarfTag tag) {
   switch (tag) {
     case DW_TAG_subprogram:
-      return new FuncHandler(cu_context_.get(), child_context_.get(), offset);
+      return new FuncHandler(cu_context_.get(), child_context_.get(), offset,
+                             handle_inline);
     case DW_TAG_namespace:
     case DW_TAG_class_type:
     case DW_TAG_structure_type:
     case DW_TAG_union_type:
     case DW_TAG_module:
       return new NamedScopeHandler(cu_context_.get(), child_context_.get(),
-                                   offset);
+                                   offset, handle_inline);
     default:
       return NULL;
   }

src/common/dwarf_cu_to_module.h

@@ -258,7 +258,8 @@ class DwarfCUToModule: public RootDIEHandler {
   DwarfCUToModule(FileContext* file_context,
                   LineToModuleHandler* line_reader,
                   RangesHandler* ranges_handler,
-                  WarningReporter* reporter);
+                  WarningReporter* reporter,
+                  bool handle_inline = false);
   ~DwarfCUToModule();
 
   void ProcessAttributeSigned(enum DwarfAttribute attr,

src/common/linux/dump_symbols.cc

@@ -287,6 +287,7 @@ bool LoadDwarf(const string& dwarf_filename,
                const typename ElfClass::Ehdr* elf_header,
                const bool big_endian,
                bool handle_inter_cu_refs,
+               bool handle_inline,
                Module* module) {
   typedef typename ElfClass::Shdr Shdr;
 
@@ -333,7 +334,7 @@ bool LoadDwarf(const string& dwarf_filename,
     // data that was found.
     DwarfCUToModule::WarningReporter reporter(dwarf_filename, offset);
     DwarfCUToModule root_handler(&file_context, &line_to_module,
-                                 &ranges_handler, &reporter);
+                                 &ranges_handler, &reporter, handle_inline);
     // Make a Dwarf2Handler that drives the DIEHandler.
     google_breakpad::DIEDispatcher die_dispatcher(&root_handler);
     // Make a DWARF parser for the compilation unit at OFFSET.
@@ -786,7 +787,8 @@ bool LoadSymbols(const string& obj_file,
       found_usable_info = true;
       info->LoadedSection(".debug_info");
       if (!LoadDwarf<ElfClass>(obj_file, elf_header, big_endian,
-                               options.handle_inter_cu_refs, module)) {
+                               options.handle_inter_cu_refs,
+                               options.symbol_data & INLINES, module)) {
         fprintf(stderr, "%s: \".debug_info\" section found, but failed to load "
                 "DWARF debugging information\n", obj_file.c_str());
       }

src/common/mac/dump_syms.cc

@@ -476,7 +476,8 @@ void DumpSymbols::ReadDwarf(google_breakpad::Module* module,
     DwarfCUToModule::WarningReporter reporter(selected_object_name_,
                                               offset);
     DwarfCUToModule root_handler(&file_context, &line_to_module,
-                                 &ranges_handler, &reporter);
+                                 &ranges_handler, &reporter,
+                                 symbol_data_ & INLINES);
     // Make a Dwarf2Handler that drives our DIEHandler.
     DIEDispatcher die_dispatcher(&root_handler);
     // Make a DWARF parser for the compilation unit at OFFSET.

src/common/module.cc

@@ -303,7 +303,6 @@ bool Module::Write(std::ostream& stream, SymbolData symbol_data) {
   }
 
   if (symbol_data & SYMBOLS_AND_FILES) {
-    if (symbol_data & INLINES)
     CreateInlineOrigins();
     AssignSourceIds();
 
@@ -318,14 +317,12 @@ bool Module::Write(std::ostream& stream, SymbolData symbol_data) {
       }
     }
     // Write out inline origins.
-    if (symbol_data & INLINES) {
     for (InlineOrigin* origin : inline_origins_) {
       stream << "INLINE_ORIGIN " << origin->id << " " << origin->getFileID()
              << " " << origin->name << "\n";
       if (!stream.good())
         return ReportError();
     }
-    }
 
     // Write out functions and their inlines and lines.
     for (FunctionSet::const_iterator func_it = functions_.begin();
@@ -344,7 +341,6 @@ bool Module::Write(std::ostream& stream, SymbolData symbol_data) {
           return ReportError();
 
         // Write out inlines.
-        if (symbol_data & INLINES) {
         auto write_inline = [&](unique_ptr<Inline>& in) {
           stream << "INLINE ";
           stream << in->inline_nest_level << " " << in->call_site_line << " "
@@ -356,7 +352,6 @@ bool Module::Write(std::ostream& stream, SymbolData symbol_data) {
         InlineDFS(func->inlines, write_inline);
         if (!stream.good())
           return ReportError();
-        }
 
         while ((line_it != func->lines.end()) &&
                (line_it->address >= range_it->address) &&