Print and save JS stacktrace on OOM crash.

src/string-stream.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_STRING_STREAM_H_
 #define V8_STRING_STREAM_H_
 
 #include "src/handles.h"
 
 namespace v8 {
@@ skipping 17 matching lines @@
  public:
   ~HeapStringAllocator() { DeleteArray(space_); }
   char* allocate(unsigned bytes) override;
   char* grow(unsigned* bytes) override;
 
  private:
   char* space_;
 };
 
 
+class FixedStringAllocator final : public StringAllocator {
+ public:
+  FixedStringAllocator(char* buffer, unsigned length)
+      : buffer_(buffer), length_(length) {}
+  ~FixedStringAllocator() override{};
+  char* allocate(unsigned bytes) override;
+  char* grow(unsigned* bytes) override;
+
+ private:
+  char* buffer_;
+  unsigned length_;
+  DISALLOW_COPY_AND_ASSIGN(FixedStringAllocator);
+};
+
+
 class FmtElm final {
  public:
   FmtElm(int value) : type_(INT) {  // NOLINT
     data_.u_int_ = value;
   }
   explicit FmtElm(double value) : type_(DOUBLE) {
     data_.u_double_ = value;
   }
   FmtElm(const char* value) : type_(C_STR) {  // NOLINT
     data_.u_c_str_ = value;
@@ skipping 22 matching lines @@
     const Vector<const uc16>* u_lc_str_;
     Object* u_obj_;
     Object** u_handle_;
     void* u_pointer_;
   } data_;
 };
 
 
 class StringStream final {
  public:
-  explicit StringStream(StringAllocator* allocator):
-    allocator_(allocator),
-    capacity_(kInitialCapacity),
-    length_(0),
-    buffer_(allocator_->allocate(kInitialCapacity)) {
+  enum ObjectPrintMode { kPrintObjectConcise, kPrintObjectVerbose };
+  StringStream(StringAllocator* allocator,
+               ObjectPrintMode object_print_mode = kPrintObjectConcise)
+      : allocator_(allocator),
+        object_print_mode_(object_print_mode),
+        capacity_(kInitialCapacity),
+        length_(0),
+        buffer_(allocator_->allocate(kInitialCapacity)) {
     buffer_[0] = 0;
   }
 
   bool Put(char c);
   bool Put(String* str);
   bool Put(String* str, int start, int end);
   void Add(Vector<const char> format, Vector<FmtElm> elms);
   void Add(const char* format);
   void Add(Vector<const char> format);
   void Add(const char* format, FmtElm arg0);
@@ skipping 32 matching lines @@
   // Reset the stream.
   void Reset() {
     length_ = 0;
     buffer_[0] = 0;
   }
 
   // Mentioned object cache support.
   void PrintMentionedObjectCache(Isolate* isolate);
   static void ClearMentionedObjectCache(Isolate* isolate);
 #ifdef DEBUG
-  static bool IsMentionedObjectCacheClear(Isolate* isolate);
+  bool IsMentionedObjectCacheClear(Isolate* isolate);
 #endif
 
   static const int kInitialCapacity = 16;
 
  private:
   void PrintObject(Object* obj);
 
   StringAllocator* allocator_;
+  ObjectPrintMode object_print_mode_;
   unsigned capacity_;
   unsigned length_;  // does not include terminating 0-character
   char* buffer_;
 
   bool full() const { return (capacity_ - length_) == 1; }
   int space() const { return capacity_ - length_; }
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(StringStream);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_STRING_STREAM_H_