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/*
* Copyright (C) 2015 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef ART_LIBELFFILE_DWARF_WRITER_H_
#define ART_LIBELFFILE_DWARF_WRITER_H_
#include <type_traits>
#include <vector>
#include <android-base/logging.h>
#include <string.h>
#include "base/bit_utils.h"
#include "base/leb128.h"
namespace art {
namespace dwarf {
// The base class for all DWARF writers.
template <typename Vector = std::vector<uint8_t>>
class Writer {
static_assert(std::is_same<typename Vector::value_type, uint8_t>::value, "Invalid value type");
public:
void PushUint8(int value) {
DCHECK_GE(value, 0);
DCHECK_LE(value, UINT8_MAX);
data_->push_back(value & 0xff);
}
void PushUint16(int value) {
DCHECK_GE(value, 0);
DCHECK_LE(value, UINT16_MAX);
data_->push_back((value >> 0) & 0xff);
data_->push_back((value >> 8) & 0xff);
}
void PushUint32(uint32_t value) {
data_->push_back((value >> 0) & 0xff);
data_->push_back((value >> 8) & 0xff);
data_->push_back((value >> 16) & 0xff);
data_->push_back((value >> 24) & 0xff);
}
void PushUint32(int value) {
DCHECK_GE(value, 0);
PushUint32(static_cast<uint32_t>(value));
}
void PushUint32(uint64_t value) {
DCHECK_LE(value, UINT32_MAX);
PushUint32(static_cast<uint32_t>(value));
}
void PushUint64(uint64_t value) {
data_->push_back((value >> 0) & 0xff);
data_->push_back((value >> 8) & 0xff);
data_->push_back((value >> 16) & 0xff);
data_->push_back((value >> 24) & 0xff);
data_->push_back((value >> 32) & 0xff);
data_->push_back((value >> 40) & 0xff);
data_->push_back((value >> 48) & 0xff);
data_->push_back((value >> 56) & 0xff);
}
void PushInt8(int value) {
DCHECK_GE(value, INT8_MIN);
DCHECK_LE(value, INT8_MAX);
PushUint8(static_cast<uint8_t>(value));
}
void PushInt16(int value) {
DCHECK_GE(value, INT16_MIN);
DCHECK_LE(value, INT16_MAX);
PushUint16(static_cast<uint16_t>(value));
}
void PushInt32(int value) {
PushUint32(static_cast<uint32_t>(value));
}
void PushInt64(int64_t value) {
PushUint64(static_cast<uint64_t>(value));
}
// Variable-length encoders.
void PushUleb128(uint32_t value) {
EncodeUnsignedLeb128(data_, value);
}
void PushUleb128(int value) {
DCHECK_GE(value, 0);
EncodeUnsignedLeb128(data_, value);
}
void PushSleb128(int value) {
EncodeSignedLeb128(data_, value);
}
// Miscellaneous functions.
void PushString(const char* value) {
data_->insert(data_->end(), value, value + strlen(value) + 1);
}
void PushData(const uint8_t* ptr, size_t num_bytes) {
data_->insert(data_->end(), ptr, ptr + num_bytes);
}
void PushData(const char* ptr, size_t num_bytes) {
data_->insert(data_->end(), ptr, ptr + num_bytes);
}
void PushData(const Vector* buffer) {
data_->insert(data_->end(), buffer->begin(), buffer->end());
}
void UpdateUint32(size_t offset, uint32_t value) {
DCHECK_LT(offset + 3, data_->size());
(*data_)[offset + 0] = (value >> 0) & 0xFF;
(*data_)[offset + 1] = (value >> 8) & 0xFF;
(*data_)[offset + 2] = (value >> 16) & 0xFF;
(*data_)[offset + 3] = (value >> 24) & 0xFF;
}
void UpdateUint64(size_t offset, uint64_t value) {
DCHECK_LT(offset + 7, data_->size());
(*data_)[offset + 0] = (value >> 0) & 0xFF;
(*data_)[offset + 1] = (value >> 8) & 0xFF;
(*data_)[offset + 2] = (value >> 16) & 0xFF;
(*data_)[offset + 3] = (value >> 24) & 0xFF;
(*data_)[offset + 4] = (value >> 32) & 0xFF;
(*data_)[offset + 5] = (value >> 40) & 0xFF;
(*data_)[offset + 6] = (value >> 48) & 0xFF;
(*data_)[offset + 7] = (value >> 56) & 0xFF;
}
void UpdateUleb128(size_t offset, uint32_t value) {
DCHECK_LE(offset + UnsignedLeb128Size(value), data_->size());
UpdateUnsignedLeb128(data_->data() + offset, value);
}
void Pop() {
return data_->pop_back();
}
void Pad(int alignment) {
DCHECK_NE(alignment, 0);
data_->resize(RoundUp(data_->size(), alignment), 0);
}
const Vector* data() const {
return data_;
}
size_t size() const {
return data_->size();
}
explicit Writer(Vector* buffer) : data_(buffer) { }
private:
Vector* const data_;
DISALLOW_COPY_AND_ASSIGN(Writer);
};
} // namespace dwarf
} // namespace art
#endif // ART_LIBELFFILE_DWARF_WRITER_H_
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