libsanitizer/sanitizer_common/sanitizer_stacktrace_libcdep.cc

   1 //===-- sanitizer_stacktrace_libcdep.cc -----------------------------------===//
   2 //
   3 // This file is distributed under the University of Illinois Open Source
   4 // License. See LICENSE.TXT for details.
   5 //
   6 //===----------------------------------------------------------------------===//
   7 //
   8 // This file is shared between AddressSanitizer and ThreadSanitizer
   9 // run-time libraries.
  10 //===----------------------------------------------------------------------===//
  11
  12 #include "sanitizer_common.h"
  13 #include "sanitizer_stacktrace.h"
  14 #include "sanitizer_symbolizer.h"
  15
  16 namespace __sanitizer {
  17
  18 static void PrintStackFramePrefix(InternalScopedString *buffer, uptr frame_num,
  19                                   uptr pc) {
  20   buffer->append("    #%zu 0x%zx", frame_num, pc);
  21 }
  22
  23 void StackTrace::PrintStack(const uptr *addr, uptr size) {
  24   if (addr == 0 || size == 0) {
  25     Printf("    <empty stack>\n\n");
  26     return;
  27   }
  28   InternalScopedBuffer<char> buff(GetPageSizeCached() * 2);
  29   InternalScopedBuffer<AddressInfo> addr_frames(64);
  30   InternalScopedString frame_desc(GetPageSizeCached() * 2);
  31   uptr frame_num = 0;
  32   for (uptr i = 0; i < size && addr[i]; i++) {
  33     // PCs in stack traces are actually the return addresses, that is,
  34     // addresses of the next instructions after the call.
  35     uptr pc = GetPreviousInstructionPc(addr[i]);
  36     uptr addr_frames_num = Symbolizer::GetOrInit()->SymbolizePC(
  37         pc, addr_frames.data(), addr_frames.size());
  38     for (uptr j = 0; j < addr_frames_num; j++) {
  39       AddressInfo &info = addr_frames[j];
  40       frame_desc.clear();
  41       PrintStackFramePrefix(&frame_desc, frame_num, pc);
  42       if (info.function) {
  43         frame_desc.append(" in %s", info.function);
  44         // Print offset in function if we don't know the source file.
  45         if (!info.file && info.function_offset != AddressInfo::kUnknown)
  46           frame_desc.append("+0x%zx", info.function_offset);
  47       }
  48       if (info.file) {
  49         frame_desc.append(" ");
  50         PrintSourceLocation(&frame_desc, info.file, info.line, info.column);
  51       } else if (info.module) {
  52         frame_desc.append(" ");
  53         PrintModuleAndOffset(&frame_desc, info.module, info.module_offset);
  54       }
  55       Printf("%s\n", frame_desc.data());
  56       frame_num++;
  57       info.Clear();
  58     }
  59   }
  60   // Always print a trailing empty line after stack trace.
  61   Printf("\n");
  62 }
  63
  64 void StackTrace::Unwind(uptr max_depth, uptr pc, uptr bp, void *context,
  65                         uptr stack_top, uptr stack_bottom,
  66                         bool request_fast_unwind) {
  67   top_frame_bp = (max_depth > 0) ? bp : 0;
  68   // Avoid doing any work for small max_depth.
  69   if (max_depth == 0) {
  70     size = 0;
  71     return;
  72   }
  73   if (max_depth == 1) {
  74     size = 1;
  75     trace[0] = pc;
  76     return;
  77   }
  78   if (!WillUseFastUnwind(request_fast_unwind)) {
  79     if (context)
  80       SlowUnwindStackWithContext(pc, context, max_depth);
  81     else
  82       SlowUnwindStack(pc, max_depth);
  83   } else {
  84     FastUnwindStack(pc, bp, stack_top, stack_bottom, max_depth);
  85   }
  86 }
  87
  88 }  // namespace __sanitizer