Allow reading just CFI data when reading symbols

R=thestig at https://breakpad.appspot.com/517002/

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1124 4c0a9323-5329-0410-9bdc-e9ce6186880e

src/common/mac/dump_syms.h

@@ -47,13 +47,15 @@
 #include "common/byte_cursor.h"
 #include "common/mac/macho_reader.h"
 #include "common/module.h"
+#include "common/symbol_data.h"
 
 namespace google_breakpad {
 
 class DumpSymbols {
  public:
-  DumpSymbols()
-      : input_pathname_(),
+  explicit DumpSymbols(SymbolData symbol_data)
+      : symbol_data_(symbol_data),
+        input_pathname_(),
         object_filename_(),
         contents_(),
         selected_object_file_(),
@@ -110,9 +112,9 @@ class DumpSymbols {
   }
 
   // Read the selected object file's debugging information, and write it out to
-  // |stream|. Write the CFI section if |cfi| is true. Return true on success;
-  // if an error occurs, report it and return false.
-  bool WriteSymbolFile(std::ostream &stream, bool cfi);
+  // |stream|. Return true on success; if an error occurs, report it and
+  // return false.
+  bool WriteSymbolFile(std::ostream &stream);
 
  private:
   // Used internally.
@@ -139,6 +141,9 @@ class DumpSymbols {
                const mach_o::Section &section,
                bool eh_frame) const;
 
+  // The selection of what type of symbol data to read/write.
+  const SymbolData symbol_data_;
+
   // The name of the file or bundle whose symbols this will dump.
   // This is the path given to Read, for use in error messages.
   NSString *input_pathname_;

src/common/mac/dump_syms.mm

@@ -55,6 +55,7 @@
 #include "common/module.h"
 #include "common/stabs_reader.h"
 #include "common/stabs_to_module.h"
+#include "common/symbol_data.h"
 
 #ifndef CPU_TYPE_ARM
 #define CPU_TYPE_ARM (static_cast<cpu_type_t>(12))
@@ -370,8 +371,12 @@ class DumpSymbols::LoadCommandDumper:
   // file, and adding data to MODULE.
   LoadCommandDumper(const DumpSymbols &dumper,
                     google_breakpad::Module *module,
-                    const mach_o::Reader &reader)
-      : dumper_(dumper), module_(module), reader_(reader) { }
+                    const mach_o::Reader &reader,
+                    SymbolData symbol_data)
+      : dumper_(dumper),
+        module_(module),
+        reader_(reader),
+        symbol_data_(symbol_data) { }
 
   bool SegmentCommand(const mach_o::Segment &segment);
   bool SymtabCommand(const ByteBuffer &entries, const ByteBuffer &strings);
@@ -380,6 +385,7 @@ class DumpSymbols::LoadCommandDumper:
   const DumpSymbols &dumper_;
   google_breakpad::Module *module_;  // WEAK
   const mach_o::Reader &reader_;
+  const SymbolData symbol_data_;
 };
 
 bool DumpSymbols::LoadCommandDumper::SegmentCommand(const Segment &segment) {
@@ -387,7 +393,7 @@ bool DumpSymbols::LoadCommandDumper::SegmentCommand(const Segment &segment) {
   if (!reader_.MapSegmentSections(segment, &section_map))
     return false;
 
-  if (segment.name == "__TEXT") {
+  if (segment.name == "__TEXT" && symbol_data_ != NO_CFI) {
     module_->SetLoadAddress(segment.vmaddr);
     mach_o::SectionMap::const_iterator eh_frame =
         section_map.find("__eh_frame");
@@ -399,13 +405,17 @@ bool DumpSymbols::LoadCommandDumper::SegmentCommand(const Segment &segment) {
   }
 
   if (segment.name == "__DWARF") {
-    if (!dumper_.ReadDwarf(module_, reader_, section_map))
-      return false;
-    mach_o::SectionMap::const_iterator debug_frame
-        = section_map.find("__debug_frame");
-    if (debug_frame != section_map.end()) {
-      // If there is a problem reading this, don't treat it as a fatal error.
-      dumper_.ReadCFI(module_, reader_, debug_frame->second, false);
+    if (symbol_data_ != ONLY_CFI) {
+      if (!dumper_.ReadDwarf(module_, reader_, section_map))
+        return false;
+    }
+    if (symbol_data_ != NO_CFI) {
+      mach_o::SectionMap::const_iterator debug_frame
+          = section_map.find("__debug_frame");
+      if (debug_frame != section_map.end()) {
+        // If there is a problem reading this, don't treat it as a fatal error.
+        dumper_.ReadCFI(module_, reader_, debug_frame->second, false);
+      }
     }
   }
 
@@ -429,7 +439,7 @@ bool DumpSymbols::LoadCommandDumper::SymtabCommand(const ByteBuffer &entries,
   return true;
 }
 
-bool DumpSymbols::WriteSymbolFile(std::ostream &stream, bool cfi) {
+bool DumpSymbols::WriteSymbolFile(std::ostream &stream) {
   // Select an object file, if SetArchitecture hasn't been called to set one
   // explicitly.
   if (!selected_object_file_) {
@@ -494,11 +504,11 @@ bool DumpSymbols::WriteSymbolFile(std::ostream &stream, bool cfi) {
     return false;
 
   // Walk its load commands, and deal with whatever is there.
-  LoadCommandDumper load_command_dumper(*this, &module, reader);
+  LoadCommandDumper load_command_dumper(*this, &module, reader, symbol_data_);
   if (!reader.WalkLoadCommands(&load_command_dumper))
     return false;
 
-  return module.Write(stream, cfi);
+  return module.Write(stream, symbol_data_);
 }
 
 }  // namespace google_breakpad