Add an API function to get a debugger stack trace from an error handle.

runtime/vm/debugger.cc

Index: runtime/vm/debugger.cc
diff --git a/runtime/vm/debugger.cc b/runtime/vm/debugger.cc
index 940147b5064855b745b67dca379056e0801125af..3aa53abe62f01e51f3eb4a2986f54e2853d68920 100644
--- a/runtime/vm/debugger.cc
+++ b/runtime/vm/debugger.cc
@@ -1271,6 +1271,79 @@ DebuggerStackTrace* Debugger::StackTrace() {
 }
 
 
+ExceptionStackTrace* Debugger::BuildExceptionStackTrace() {
+  Isolate* isolate = Isolate::Current();
+  ExceptionStackTrace* result = new ExceptionStackTrace(8);
+  StackFrameIterator iterator(false);
+  Function& function = Function::Handle(isolate);
+  Code& code = Code::Handle(isolate);
+  Code& inlined_code = Code::Handle(isolate);
+
+  String& function_name = String::Handle(isolate);
+  String& script_uri = String::Handle(isolate);
+  Script& script = Script::Handle(isolate);
+
+  for (StackFrame* frame = iterator.NextFrame();
+       frame != NULL;
+       frame = iterator.NextFrame()) {
+    ASSERT(frame->IsValid());
+    if (frame->IsEntryFrame()) {
+    } else if (frame->IsDartFrame()) {
+      code = frame->LookupDartCode();
+      if (code.is_optimized()) {
+        for (InlinedFunctionsIterator it(code, frame->pc());
+             !it.Done();
+             it.Advance()) {
+          function = it.function();
+          inlined_code = it.code();
+          uword pc = it.pc();
+
+          if (!function.is_visible()) continue;
+
+          function_name = function.QualifiedUserVisibleName();
+          script = function.script();
+          script_uri = script.url();
+          const intptr_t token_pos = inlined_code.GetTokenIndexOfPC(pc);
+          intptr_t line = -1;
+          intptr_t column = -1;
+          if (token_pos >= 0) {
+            if (script.HasSource()) {
+              script.GetTokenLocation(token_pos, &line, &column);
+            } else {
+              script.GetTokenLocation(token_pos, &line, NULL);
+            }
+          }
+          result->AddFrame(
+            new ExceptionStackFrame(function_name, script_uri, line, column));
+        }
+      } else {
+        function = frame->LookupDartFunction();
+        uword pc = frame->pc();
+
+        if (!function.is_visible()) continue;
+
+        function_name = function.QualifiedUserVisibleName();
+        script = function.script();
+        script_uri = script.url();
+        const intptr_t token_pos = code.GetTokenIndexOfPC(pc);
+        intptr_t line = -1;
+        intptr_t column = -1;
+        if (token_pos >= 0) {
+          if (script.HasSource()) {
+            script.GetTokenLocation(token_pos, &line, &column);
+          } else {
+            script.GetTokenLocation(token_pos, &line, NULL);
+          }
+        }
+        result->AddFrame(
+          new ExceptionStackFrame(function_name, script_uri, line, column));
+      }
+    }
+  }
+  return result;
+}
+
+
 void Debugger::SetExceptionPauseInfo(Dart_ExceptionPauseInfo pause_info) {
   ASSERT((pause_info == kNoPauseOnExceptions) ||
          (pause_info == kPauseOnUnhandledExceptions) ||