blob: fd942680fd87978d9fb84c06ae2fb5c035e0d0a2 [file] [log] [blame]
// Copyright (c) 2012, 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 "platform/utils.h"
#include "vm/globals.h"
namespace dart {
// DebugInfo is used to generate minimal debug information containing code,
// symbols, and line numbers for generated code in the dart VM. This information
// can be used in two ways:
// - for debugging using a debugger
// - for generating information to be read by pprof to analyze Dart programs.
class DebugInfo {
// A basic ByteBuffer which is growable and uses malloc/free.
class ByteBuffer {
ByteBuffer() : size_(0), capacity_(0), data_(NULL) { }
~ByteBuffer() {
size_ = 0;
capacity_ = 0;
data_ = NULL;
uint8_t at(int index) const {
ASSERT(0 <= index);
ASSERT(index < size_);
ASSERT(size_ <= capacity_);
return data_[index];
uint8_t* data() const { return data_; }
void set_data(uint8_t* value) { data_ = value; }
int size() const { return size_; }
// Append an element.
void Add(const uint8_t value) {
Resize(size() + 1);
data_[size() - 1] = value;
void Resize(int new_size) {
if (new_size > capacity_) {
int new_capacity = Utils::RoundUpToPowerOfTwo(new_size);
uint8_t* new_data =
reinterpret_cast<uint8_t*>(realloc(data_, new_capacity));
ASSERT(new_data != NULL);
data_ = new_data;
capacity_ = new_capacity;
size_ = new_size;
int size_;
int capacity_;
uint8_t* data_;
// Disallow assignment
// Add the code starting at pc.
void AddCode(uword pc, intptr_t size);
// Add symbol information for a region (includes the start and end symbol),
// does not add the actual code.
void AddCodeRegion(const char* name, uword pc, intptr_t size);
// Write out all the debug information info the memory region.
bool WriteToMemory(ByteBuffer* region);
// Create a new debug information generator.
static DebugInfo* NewGenerator();
// Register this generated section with debuggger using the JIT interface.
static void RegisterSection(const char* name,
uword entry_point,
intptr_t size);
// Unregister all generated section from debuggger.
static void UnregisterAllSections();
void* handle_;
} // namespace dart
#endif // VM_DEBUGINFO_H_