libsanitizer/sanitizer_common/sanitizer_stacktrace_printer.cc

   1 //===-- sanitizer_common.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 sanitizers' run-time libraries.
   9 //
  10 //===----------------------------------------------------------------------===//
  11
  12 #include "sanitizer_stacktrace_printer.h"
  13
  14 namespace __sanitizer {
  15
  16 static const char *StripFunctionName(const char *function, const char *prefix) {
  17   if (!function) return nullptr;
  18   if (!prefix) return function;
  19   uptr prefix_len = internal_strlen(prefix);
  20   if (0 == internal_strncmp(function, prefix, prefix_len))
  21     return function + prefix_len;
  22   return function;
  23 }
  24
  25 static const char kDefaultFormat[] = "    #%n %p %F %L";
  26
  27 void RenderFrame(InternalScopedString *buffer, const char *format, int frame_no,
  28                  const AddressInfo &info, bool vs_style,
  29                  const char *strip_path_prefix, const char *strip_func_prefix) {
  30   if (0 == internal_strcmp(format, "DEFAULT"))
  31     format = kDefaultFormat;
  32   for (const char *p = format; *p != '\0'; p++) {
  33     if (*p != '%') {
  34       buffer->append("%c", *p);
  35       continue;
  36     }
  37     p++;
  38     switch (*p) {
  39     case '%':
  40       buffer->append("%%");
  41       break;
  42     // Frame number and all fields of AddressInfo structure.
  43     case 'n':
  44       buffer->append("%zu", frame_no);
  45       break;
  46     case 'p':
  47       buffer->append("0x%zx", info.address);
  48       break;
  49     case 'm':
  50       buffer->append("%s", StripPathPrefix(info.module, strip_path_prefix));
  51       break;
  52     case 'o':
  53       buffer->append("0x%zx", info.module_offset);
  54       break;
  55     case 'f':
  56       buffer->append("%s", StripFunctionName(info.function, strip_func_prefix));
  57       break;
  58     case 'q':
  59       buffer->append("0x%zx", info.function_offset != AddressInfo::kUnknown
  60                                   ? info.function_offset
  61                                   : 0x0);
  62       break;
  63     case 's':
  64       buffer->append("%s", StripPathPrefix(info.file, strip_path_prefix));
  65       break;
  66     case 'l':
  67       buffer->append("%d", info.line);
  68       break;
  69     case 'c':
  70       buffer->append("%d", info.column);
  71       break;
  72     // Smarter special cases.
  73     case 'F':
  74       // Function name and offset, if file is unknown.
  75       if (info.function) {
  76         buffer->append("in %s",
  77                        StripFunctionName(info.function, strip_func_prefix));
  78         if (!info.file && info.function_offset != AddressInfo::kUnknown)
  79           buffer->append("+0x%zx", info.function_offset);
  80       }
  81       break;
  82     case 'S':
  83       // File/line information.
  84       RenderSourceLocation(buffer, info.file, info.line, info.column, vs_style,
  85                            strip_path_prefix);
  86       break;
  87     case 'L':
  88       // Source location, or module location.
  89       if (info.file) {
  90         RenderSourceLocation(buffer, info.file, info.line, info.column,
  91                              vs_style, strip_path_prefix);
  92       } else if (info.module) {
  93         RenderModuleLocation(buffer, info.module, info.module_offset,
  94                              strip_path_prefix);
  95       } else {
  96         buffer->append("(<unknown module>)");
  97       }
  98       break;
  99     case 'M':
 100       // Module basename and offset, or PC.
 101       if (info.address & kExternalPCBit)
 102         {} // There PCs are not meaningful.
 103       else if (info.module)
 104         buffer->append("(%s+%p)", StripModuleName(info.module),
 105                        (void *)info.module_offset);
 106       else
 107         buffer->append("(%p)", (void *)info.address);
 108       break;
 109     default:
 110       Report("Unsupported specifier in stack frame format: %c (0x%zx)!\n", *p,
 111              *p);
 112       Die();
 113     }
 114   }
 115 }
 116
 117 void RenderSourceLocation(InternalScopedString *buffer, const char *file,
 118                           int line, int column, bool vs_style,
 119                           const char *strip_path_prefix) {
 120   if (vs_style && line > 0) {
 121     buffer->append("%s(%d", StripPathPrefix(file, strip_path_prefix), line);
 122     if (column > 0)
 123       buffer->append(",%d", column);
 124     buffer->append(")");
 125     return;
 126   }
 127
 128   buffer->append("%s", StripPathPrefix(file, strip_path_prefix));
 129   if (line > 0) {
 130     buffer->append(":%d", line);
 131     if (column > 0)
 132       buffer->append(":%d", column);
 133   }
 134 }
 135
 136 void RenderModuleLocation(InternalScopedString *buffer, const char *module,
 137                           uptr offset, const char *strip_path_prefix) {
 138   buffer->append("(%s+0x%zx)", StripPathPrefix(module, strip_path_prefix),
 139                  offset);
 140 }
 141
 142 } // namespace __sanitizer