Make the segfault handler attempt to symbolize Dart frames.

R=fschneider@google.com

Review-Url: https://codereview.chromium.org/2668443004 .

runtime/bin/platform_linux.cc

@@ -54,6 +54,10 @@ bool Platform::Initialize() {
     perror("sigaction() failed.");
     return false;
   }
+  if (sigaction(SIGTRAP, &act, NULL) != 0) {
+    perror("sigaction() failed.");
+    return false;
+  }
   return true;
 }
 

runtime/bin/platform_macos.cc

@@ -59,6 +59,10 @@ bool Platform::Initialize() {
     perror("sigaction() failed.");
     return false;
   }
+  if (sigaction(SIGTRAP, &act, NULL) != 0) {
+    perror("sigaction() failed.");
+    return false;
+  }
   return true;
 }
 

runtime/vm/profiler.cc

@@ -330,6 +330,20 @@ void ClearProfileVisitor::VisitSample(Sample* sample) {
 
 
 static void DumpStackFrame(intptr_t frame_index, uword pc) {
+  Isolate* isolate = Isolate::Current();
+  if ((isolate != NULL) && isolate->is_runnable()) {
+    Code& code = Code::Handle(Code::LookupCodeInVmIsolate(pc));
+    if (!code.IsNull()) {
+      OS::PrintErr("  [0x%" Pp "] %s\n", pc, code.QualifiedName());
+      return;
+    }
+    code = Code::LookupCode(pc);
+    if (!code.IsNull()) {
+      OS::PrintErr("  [0x%" Pp "] %s\n", pc, code.QualifiedName());
+      return;
+    }
+  }
+
   uintptr_t start = 0;
   char* native_symbol_name = NativeSymbolResolver::LookupSymbolName(pc, &start);
   if (native_symbol_name == NULL) {
@@ -341,16 +355,6 @@ static void DumpStackFrame(intptr_t frame_index, uword pc) {
 }
 
 
-static void DumpStackFrame(intptr_t frame_index, uword pc, const Code& code) {
-  if (code.IsNull()) {
-    DumpStackFrame(frame_index, pc);
-  } else {
-    OS::PrintErr("Frame[%" Pd "] = Dart:`%s` [0x%" Px "]\n", frame_index,
-                 code.ToCString(), pc);
-  }
-}
-
-
 class ProfilerStackWalker : public ValueObject {
  public:
   ProfilerStackWalker(Isolate* isolate,
@@ -370,16 +374,6 @@ class ProfilerStackWalker : public ValueObject {
     }
   }
 
-  bool Append(uword pc, const Code& code) {
-    if (sample_ == NULL) {
-      DumpStackFrame(frame_index_, pc, code);
-      frame_index_++;
-      total_frames_++;
-      return true;
-    }
-    return Append(pc);
-  }
-
   bool Append(uword pc) {
     if (sample_ == NULL) {
       DumpStackFrame(frame_index_, pc);