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/*
* Copyright 2016 WebAssembly Community Group participants
*
* 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 WABT_STREAM_H_
#define WABT_STREAM_H_
#include <cassert>
#include <memory>
#include "common.h"
#include "writer.h"
namespace wabt {
/* whether to display the ASCII characters in the debug output for
* write_memory */
enum class PrintChars {
No = 0,
Yes = 1,
};
class Stream {
public:
Stream(Writer* writer, Stream* log_stream = nullptr);
size_t offset() { return offset_; }
Result result() { return result_; }
void set_log_stream(Stream* stream) {
assert(stream);
log_stream_ = stream;
}
Stream& log_stream() {
assert(log_stream_);
return *log_stream_;
}
bool has_log_stream() const { return log_stream_ != nullptr; }
void AddOffset(ssize_t delta);
void WriteData(const void* src,
size_t size,
const char* desc = nullptr,
PrintChars = PrintChars::No);
void MoveData(size_t dst_offset, size_t src_offset, size_t size);
void WriteDataAt(size_t offset,
const void* src,
size_t size,
const char* desc = nullptr,
PrintChars = PrintChars::No);
void WABT_PRINTF_FORMAT(2, 3) Writef(const char* format, ...);
// Specified as uint32_t instead of uint8_t so we can check if the value
// given is in range before wrapping.
void WriteU8(uint32_t value,
const char* desc = nullptr,
PrintChars print_chars = PrintChars::No) {
assert(value <= UINT8_MAX);
Write(static_cast<uint8_t>(value), desc, print_chars);
}
void WriteU32(uint32_t value,
const char* desc = nullptr,
PrintChars print_chars = PrintChars::No) {
Write(value, desc, print_chars);
}
void WriteU64(uint64_t value,
const char* desc = nullptr,
PrintChars print_chars = PrintChars::No) {
Write(value, desc, print_chars);
}
void WriteChar(char c,
const char* desc = nullptr,
PrintChars print_chars = PrintChars::No) {
WriteU8(c, desc, print_chars);
}
// Dump memory as text, similar to the xxd format.
void WriteMemoryDump(const void* start,
size_t size,
size_t offset = 0,
const char* prefix = nullptr,
const char* desc = nullptr,
PrintChars print_chars = PrintChars::No);
// Convenience functions for writing enums.
template <typename T>
void WriteU8Enum(T value,
const char* desc = nullptr,
PrintChars print_chars = PrintChars::No) {
WriteU8(static_cast<uint32_t>(value), desc, print_chars);
}
private:
template <typename T>
void Write(const T& data, const char* desc, PrintChars print_chars) {
WriteData(&data, sizeof(data), desc, print_chars);
}
Writer* writer_; // Not owned.
size_t offset_;
Result result_;
// Not owned. If non-null, log all writes to this stream.
Stream* log_stream_;
};
class MemoryStream : public Stream {
public:
MemoryStream();
MemoryWriter& writer() { return writer_; }
std::unique_ptr<OutputBuffer> ReleaseOutputBuffer() {
return writer_.ReleaseOutputBuffer();
}
Result WriteToFile(const char* filename) {
return writer_.output_buffer().WriteToFile(filename);
}
private:
MemoryWriter writer_;
};
class FileStream : public Stream {
public:
explicit FileStream(const char* filename);
explicit FileStream(FILE*);
FileWriter& writer() { return writer_; }
static std::unique_ptr<FileStream> CreateStdout();
static std::unique_ptr<FileStream> CreateStderr();
bool is_open() const { return writer_.is_open(); }
private:
FileWriter writer_;
};
} // namespace wabt
#endif /* WABT_STREAM_H_ */
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