[ASan] add new ASan option 'strip_path_prefix' to remove useless prefices from filenames in stack traces

llvm-svn: 161321

1 files changed, 17 insertions, 5 deletions

diff --git a/compiler-rt/lib/asan/asan_stack.cc b/compiler-rt/lib/asan/asan_stack.cc
index d6103c2c98f..703cc692bc1 100644
--- a/compiler-rt/lib/asan/asan_stack.cc
+++ b/compiler-rt/lib/asan/asan_stack.cc
@@ -26,6 +26,13 @@ ASAN_USE_EXTERNAL_SYMBOLIZER(const void *pc, char *out, int out_size);
 
 namespace __asan {
 
+static const char *StripPathPrefix(const char *filepath) {
+  const char *path_prefix = flags()->strip_path_prefix;
+  if (filepath == internal_strstr(filepath, path_prefix))
+    return filepath + internal_strlen(path_prefix);
+  return filepath;
+}
+
 // ----------------------- AsanStackTrace ----------------------------- {{{1
 // PCs in stack traces are actually the return addresses, that is,
 // addresses of the next instructions after the call. That's why we
@@ -46,7 +53,10 @@ void AsanStackTrace::PrintStack(uptr *addr, uptr size) {
       pc = patch_pc(pc);
     char buff[4096];
     ASAN_USE_EXTERNAL_SYMBOLIZER((void*)pc, buff, sizeof(buff));
-    AsanPrintf("  #%zu 0x%zx %s\n", i, pc, buff);
+    // We can't know anything about the string returned by external
+    // symbolizer, but if it starts with filename, try to strip path prefix
+    // from it.
+    AsanPrintf("  #%zu 0x%zx %s\n", i, pc, StripPathPrefix(buff));
   }
 }
 
@@ -72,9 +82,11 @@ void AsanStackTrace::PrintStack(uptr *addr, uptr size) {
           AsanPrintf(" in %s", info.function);
         }
         if (info.file) {
-          AsanPrintf(" %s:%d:%d", info.file, info.line, info.column);
+          AsanPrintf(" %s:%d:%d", StripPathPrefix(info.file), info.line,
+                                  info.column);
         } else if (info.module) {
-          AsanPrintf(" (%s+0x%zx)", info.module, info.module_offset);
+          AsanPrintf(" (%s+0x%zx)", StripPathPrefix(info.module),
+                                    info.module_offset);
         }
         AsanPrintf("\n");
         info.Clear();
@@ -85,8 +97,8 @@ void AsanStackTrace::PrintStack(uptr *addr, uptr size) {
       char filename[4096];
       if (proc_maps.GetObjectNameAndOffset(pc, &offset,
                                            filename, sizeof(filename))) {
-        AsanPrintf("    #%zu 0x%zx (%s+0x%zx)\n", frame_num, pc, filename,
-                                                  offset);
+        AsanPrintf("    #%zu 0x%zx (%s+0x%zx)\n",
+                   frame_num, pc, StripPathPrefix(filename), offset);
       } else {
         AsanPrintf("    #%zu 0x%zx\n", frame_num, pc);
       }