The Tor Browser: toolkit/crashreporter/google-breakpad/src/processor/stackwalker.cc@b8a032363ba2 (annotated)

toolkit/crashreporter/google-breakpad/src/processor/stackwalker.cc@b8a032363ba2 (annotated)

toolkit/crashreporter/google-breakpad/src/processor/stackwalker.cc

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 // Copyright (c) 2010 Google Inc.
 // All rights reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 // stackwalker.cc: Generic stackwalker.
 //
 // See stackwalker.h for documentation.
 //
 // Author: Mark Mentovai
 #include "google_breakpad/processor/stackwalker.h"
 #include <assert.h>
 #include "common/scoped_ptr.h"
 #include "google_breakpad/processor/call_stack.h"
 #include "google_breakpad/processor/code_module.h"
 #include "google_breakpad/processor/code_modules.h"
 #include "google_breakpad/processor/minidump.h"
 #include "google_breakpad/processor/stack_frame.h"
 #include "google_breakpad/processor/stack_frame_symbolizer.h"
 #include "google_breakpad/processor/system_info.h"
 #include "processor/linked_ptr.h"
 #include "common/logging.h"
 #include "processor/stackwalker_ppc.h"
 #include "processor/stackwalker_sparc.h"
 #include "processor/stackwalker_x86.h"
 #include "processor/stackwalker_amd64.h"
 #include "processor/stackwalker_arm.h"
 namespace google_breakpad {
 const int Stackwalker::kRASearchWords = 30;
 uint32_t Stackwalker::max_frames_ = 1024;
 bool Stackwalker::max_frames_set_ = false;
 uint32_t Stackwalker::max_frames_scanned_ = 1024;
 Stackwalker::Stackwalker(const SystemInfo* system_info,
                          MemoryRegion* memory,
                          const CodeModules* modules,
                          StackFrameSymbolizer* frame_symbolizer)
     : system_info_(system_info),
       memory_(memory),
       modules_(modules),
       frame_symbolizer_(frame_symbolizer) {
   assert(frame_symbolizer_);
 }
 bool Stackwalker::Walk(CallStack* stack,
                        vector<const CodeModule*>* modules_without_symbols) {
   BPLOG_IF(ERROR, !stack) << "Stackwalker::Walk requires |stack|";
   assert(stack);
   stack->Clear();
   BPLOG_IF(ERROR, !modules_without_symbols) << "Stackwalker::Walk requires "
                                             << "|modules_without_symbols|";
   assert(modules_without_symbols);
   // Begin with the context frame, and keep getting callers until there are
   // no more.
   // Keep track of the number of scanned or otherwise dubious frames seen
   // so far, as the caller may have set a limit.
   uint32_t n_scanned_frames = 0;
   // Take ownership of the pointer returned by GetContextFrame.
   scoped_ptr<StackFrame> frame(GetContextFrame());
   while (frame.get()) {
     // frame already contains a good frame with properly set instruction and
     // frame_pointer fields.  The frame structure comes from either the
     // context frame (above) or a caller frame (below).
     // Resolve the module information, if a module map was provided.
     StackFrameSymbolizer::SymbolizerResult symbolizer_result =
         frame_symbolizer_->FillSourceLineInfo(modules_, system_info_,
                                              frame.get());
     if (symbolizer_result == StackFrameSymbolizer::kInterrupt) {
       BPLOG(INFO) << "Stack walk is interrupted.";
       return false;
     }
     // Keep track of modules that have no symbols.
     if (symbolizer_result == StackFrameSymbolizer::kError &&
         frame->module != NULL) {
       bool found = false;
       vector<const CodeModule*>::iterator iter;
       for (iter = modules_without_symbols->begin();
            iter != modules_without_symbols->end();
            ++iter) {
         if (*iter == frame->module) {
           found = true;
           break;
         }
       }
       if (!found) {
         BPLOG(INFO) << "Couldn't load symbols for: "
                     << frame->module->debug_file() << "|"
                     << frame->module->debug_identifier();
         modules_without_symbols->push_back(frame->module);
       }
     }
     // Keep track of the number of dubious frames so far.
     switch (frame.get()->trust) {
        case StackFrame::FRAME_TRUST_NONE:
        case StackFrame::FRAME_TRUST_SCAN:
        case StackFrame::FRAME_TRUST_CFI_SCAN:
          n_scanned_frames++;
          break;
       default:
         break;
     }
     // Add the frame to the call stack.  Relinquish the ownership claim
     // over the frame, because the stack now owns it.
     stack->frames_.push_back(frame.release());
     if (stack->frames_.size() > max_frames_) {
       // Only emit an error message in the case where the limit that we
       // reached is the default limit, not set by the user.
       if (!max_frames_set_)
         BPLOG(ERROR) << "The stack is over " << max_frames_ << " frames.";
       break;
     }
     // Get the next frame and take ownership.
     bool stack_scan_allowed = n_scanned_frames < max_frames_scanned_;
     frame.reset(GetCallerFrame(stack, stack_scan_allowed));
   }
   return true;
 }
 // static
 Stackwalker* Stackwalker::StackwalkerForCPU(
     const SystemInfo* system_info,
     MinidumpContext* context,
     MemoryRegion* memory,
     const CodeModules* modules,
     StackFrameSymbolizer* frame_symbolizer) {
   if (!context) {
     BPLOG(ERROR) << "Can't choose a stackwalker implementation without context";
     return NULL;
   }
   Stackwalker* cpu_stackwalker = NULL;
   uint32_t cpu = context->GetContextCPU();
   switch (cpu) {
     case MD_CONTEXT_X86:
       cpu_stackwalker = new StackwalkerX86(system_info,
                                            context->GetContextX86(),
                                            memory, modules, frame_symbolizer);
       break;
     case MD_CONTEXT_PPC:
       cpu_stackwalker = new StackwalkerPPC(system_info,
                                            context->GetContextPPC(),
                                            memory, modules, frame_symbolizer);
       break;
     case MD_CONTEXT_AMD64:
       cpu_stackwalker = new StackwalkerAMD64(system_info,
                                              context->GetContextAMD64(),
                                              memory, modules, frame_symbolizer);
       break;
     case MD_CONTEXT_SPARC:
       cpu_stackwalker = new StackwalkerSPARC(system_info,
                                              context->GetContextSPARC(),
                                              memory, modules, frame_symbolizer);
       break;
     case MD_CONTEXT_ARM:
       int fp_register = -1;
       if (system_info->os_short == "ios")
         fp_register = MD_CONTEXT_ARM_REG_IOS_FP;
       cpu_stackwalker = new StackwalkerARM(system_info,
                                            context->GetContextARM(),
                                            fp_register, memory, modules,
                                            frame_symbolizer);
       break;
   }
   BPLOG_IF(ERROR, !cpu_stackwalker) << "Unknown CPU type " << HexString(cpu) <<
                                        ", can't choose a stackwalker "
                                        "implementation";
   return cpu_stackwalker;
 }
 bool Stackwalker::InstructionAddressSeemsValid(uint64_t address) {
   StackFrame frame;
   frame.instruction = address;
   StackFrameSymbolizer::SymbolizerResult symbolizer_result =
       frame_symbolizer_->FillSourceLineInfo(modules_, system_info_, &frame);
   if (!frame.module) {
     // not inside any loaded module
     return false;
   }
   if (!frame_symbolizer_->HasImplementation()) {
     // No valid implementation to symbolize stack frame, but the address is
     // within a known module.
     return true;
   }
   if (symbolizer_result != StackFrameSymbolizer::kNoError) {
     // Some error occurred during symbolization, but the address is within a
     // known module
     return true;
   }
   return !frame.function_name.empty();
 }
 }  // namespace google_breakpad

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toolkit/crashreporter/google-breakpad/src/processor/stackwalker.cc@b8a032363ba2 (annotated)

toolkit/crashreporter/google-breakpad/src/processor/stackwalker.cc