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/*
* Copyright 2017 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.
*/
//
// Abstracts reading and writing, supporting both text and binary
// depending on the suffix.
//
// When the suffix is unclear, writing defaults to text (this
// allows odd suffixes, which we use in the test suite), while
// reading will check the magic number and default to text if not
// binary.
//
#include "wasm-io.h"
#include "wasm-s-parser.h"
#include "wasm-binary.h"
namespace wasm {
void ModuleReader::readText(std::string filename, Module& wasm) {
if (debug) std::cerr << "reading text from " << filename << "\n";
auto input(read_file<std::string>(filename, Flags::Text, debug ? Flags::Debug : Flags::Release));
SExpressionParser parser(const_cast<char*>(input.c_str()));
Element& root = *parser.root;
SExpressionWasmBuilder builder(wasm, *root[0]);
}
void ModuleReader::readBinary(std::string filename, Module& wasm,
std::string sourceMapFilename) {
if (debug) std::cerr << "reading binary from " << filename << "\n";
auto input(read_file<std::vector<char>>(filename, Flags::Binary, debug ? Flags::Debug : Flags::Release));
std::unique_ptr<std::ifstream> sourceMapStream;
WasmBinaryBuilder parser(wasm, input, debug);
if (sourceMapFilename.size()) {
sourceMapStream = make_unique<std::ifstream>();
sourceMapStream->open(sourceMapFilename);
parser.setDebugLocations(sourceMapStream.get());
}
parser.read();
if (sourceMapStream) {
sourceMapStream->close();
}
}
bool ModuleReader::isBinaryFile(std::string filename) {
std::ifstream infile;
std::ios_base::openmode flags = std::ifstream::in | std::ifstream::binary;
infile.open(filename, flags);
char buffer[4] = { 1, 2, 3, 4 };
infile.read(buffer, 4);
infile.close();
return buffer[0] == '\0' && buffer[1] == 'a' && buffer[2] == 's' && buffer[3] == 'm';
}
void ModuleReader::read(std::string filename, Module& wasm,
std::string sourceMapFilename) {
if (isBinaryFile(filename)) {
readBinary(filename, wasm, sourceMapFilename);
} else {
// default to text
if (sourceMapFilename.size()) {
std::cerr << "Binaryen ModuleReader::read() - source map filename provided, but file appears to not be binary\n";
}
readText(filename, wasm);
}
}
void ModuleWriter::writeText(Module& wasm, Output& output) {
WasmPrinter::printModule(&wasm, output.getStream());
}
void ModuleWriter::writeText(Module& wasm, std::string filename) {
if (debug) std::cerr << "writing text to " << filename << "\n";
Output output(filename, Flags::Text, debug ? Flags::Debug : Flags::Release);
writeText(wasm, output);
}
void ModuleWriter::writeBinary(Module& wasm, Output& output) {
BufferWithRandomAccess buffer(debug);
WasmBinaryWriter writer(&wasm, buffer, debug);
// if debug info is used, then we want to emit the names section
writer.setNamesSection(debugInfo);
std::unique_ptr<std::ofstream> sourceMapStream;
if (sourceMapFilename.size()) {
sourceMapStream = make_unique<std::ofstream>();
sourceMapStream->open(sourceMapFilename);
writer.setSourceMap(sourceMapStream.get(), sourceMapUrl);
}
if (symbolMap.size() > 0) writer.setSymbolMap(symbolMap);
writer.write();
buffer.writeTo(output);
if (sourceMapStream) {
sourceMapStream->close();
}
}
void ModuleWriter::writeBinary(Module& wasm, std::string filename) {
if (debug) std::cerr << "writing binary to " << filename << "\n";
Output output(filename, Flags::Binary, debug ? Flags::Debug : Flags::Release);
writeBinary(wasm, output);
}
void ModuleWriter::write(Module& wasm, Output& output) {
if (binary) {
writeBinary(wasm, output);
} else {
writeText(wasm, output);
}
}
void ModuleWriter::write(Module& wasm, std::string filename) {
if (binary && filename.size() > 0) {
writeBinary(wasm, filename);
} else {
writeText(wasm, filename);
}
}
}
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