Support stacktrace and objecthistogram service commands

runtime/vm/json_stream.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/assert.h"
 #include "vm/object.h"
 #include "vm/json_stream.h"
 
 
 namespace dart {
@@ skipping 66 matching lines @@
   buffer_->Printf("%f", d);
 }
 
 
 void JSONStream::PrintValue(const char* s) {
   PrintCommaIfNeeded();
   buffer_->Printf("\"%s\"", s);
 }
 
 
+void JSONStream::PrintfValue(const char* format, ...) {
+  PrintCommaIfNeeded();
+
+  va_list args;
+  va_start(args, format);
+  intptr_t len = OS::VSNPrint(NULL, 0, format, args);
+  va_end(args);
+  char* p = reinterpret_cast<char*>(malloc(len+1));
+  va_start(args, format);
+  intptr_t len2 = OS::VSNPrint(p, len+1, format, args);
+  va_end(args);
+  ASSERT(len == len2);
+  buffer_->Printf("\"%s\"", p);
+  free(p);
+}
+
+
 void JSONStream::PrintValue(const Object& o, bool ref) {
   PrintCommaIfNeeded();
   o.PrintToJSONStream(this, ref);
 }
 
 
 void JSONStream::PrintPropertyBool(const char* name, bool b) {
   PrintPropertyName(name);
   PrintValueBool(b);
 }
@@ skipping 10 matching lines @@
   PrintValue(d);
 }
 
 
 void JSONStream::PrintProperty(const char* name, const char* s) {
   PrintPropertyName(name);
   PrintValue(s);
 }
 
 
+void JSONStream::PrintfProperty(const char* name, const char* format, ...) {
+  PrintPropertyName(name);
+  va_list args;
+  va_start(args, format);
+  intptr_t len = OS::VSNPrint(NULL, 0, format, args);
+  va_end(args);
+  char* p = reinterpret_cast<char*>(malloc(len+1));
+  va_start(args, format);
+  intptr_t len2 = OS::VSNPrint(p, len+1, format, args);
+  va_end(args);
+  ASSERT(len == len2);
+  buffer_->Printf("\"%s\"", p);
+  free(p);
+}
+
+
 void JSONStream::PrintProperty(const char* name, const Object& o, bool ref) {
   PrintPropertyName(name);
   PrintValue(o, ref);
 }
 
 
 void JSONStream::PrintPropertyName(const char* name) {
   ASSERT(name != NULL);
   PrintCommaIfNeeded();
   buffer_->Printf("\"%s\":", name);
@@ skipping 12 matching lines @@
   intptr_t length = buffer_->length();
   if (length == 0) {
     return false;
   }
   char ch = buffer[length-1];
   return ch != '[' && ch != '{' && ch != ':' && ch != ',';
 }
 
 }  // namespace dart