src/regexp-macro-assembler.cc

// Copyright 2008 the V8 project authors. All rights reserved.
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#include <string.h>
#include "v8.h"
#include "ast.h"
#include "assembler.h"
#include "regexp-macro-assembler.h"

namespace v8 {
namespace internal {

RegExpMacroAssembler::RegExpMacroAssembler() {
}


RegExpMacroAssembler::~RegExpMacroAssembler() {
}


ByteArrayProvider::ByteArrayProvider(unsigned int initial_size)
  : byte_array_size_(initial_size),
    current_byte_array_(),
    current_byte_array_free_offset_(initial_size) {}


ArraySlice ByteArrayProvider::GetBuffer(unsigned int size,
                                        unsigned int elem_size) {
  ASSERT(size > 0);
  size_t byte_size = size * elem_size;
  int free_offset = current_byte_array_free_offset_;
  // align elements
  free_offset += elem_size - 1;
  free_offset = free_offset - (free_offset % elem_size);

  if (free_offset + byte_size > byte_array_size_) {
    if (byte_size > (byte_array_size_ / 2)) {
      Handle<ByteArray> solo_buffer(Factory::NewByteArray(byte_size, TENURED));
      return ArraySlice(solo_buffer, 0);
    }
    current_byte_array_ = Factory::NewByteArray(byte_array_size_, TENURED);
    free_offset = 0;
  }
  current_byte_array_free_offset_ = free_offset + byte_size;
  return ArraySlice(current_byte_array_, free_offset);
}


template <typename T>
ArraySlice ByteArrayProvider::GetBuffer(Vector<T> values) {
  ArraySlice slice = GetBuffer(values.length(), sizeof(T));
  memcpy(slice.location(), values.start(), values.length() * sizeof(T));
  return slice;
}
} }  // namespace v8::internal