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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.
*/
//
// wasm-link-metadata console tool
// Reads wasm .o file and emits .json metadata
//
#include <exception>
#include "abi/wasm-object.h"
#include "ir/trapping.h"
#include "support/colors.h"
#include "support/command-line.h"
#include "support/file.h"
#include "wasm-binary.h"
#include "wasm-emscripten.h"
#include "wasm-io.h"
#include "wasm-linker.h"
#include "wasm-printing.h"
#include "wasm-validator.h"
using namespace cashew;
using namespace wasm;
void parseLinkingSection(std::vector<char> const& data, uint32_t &dataSize) {
unsigned idx = 0;
auto get = [&idx, &data](){ return data[idx++]; };
auto readNext = [get](){
U32LEB leb;
leb.read(get);
return leb.value;
};
while (idx < data.size()) {
ABI::LinkType type = static_cast<ABI::LinkType>(readNext());
uint32_t size = readNext();
uint32_t startIdx = idx;
switch(type) {
case ABI::WASM_DATA_SIZE: {
dataSize = readNext();
break;
}
default: {
break;
}
}
// Always go to the end of the subsection based on size, not contents.
idx = startIdx + size;
}
}
int main(int argc, const char *argv[]) {
std::string infile;
std::string outfile;
Options options("wasm-link-metadata",
"Reads wasm .o file and emits .json metadata");
options
.add("--output", "-o", "Output file",
Options::Arguments::One,
[&outfile](Options *o, const std::string &argument) {
outfile = argument;
Colors::disable();
})
.add_positional("INFILE", Options::Arguments::One,
[&infile](Options *o, const std::string &argument) {
infile = argument;
});
options.parse(argc, argv);
if (infile == "") {
Fatal() << "Need to specify an infile\n";
}
Module wasm;
try {
ModuleReader reader;
reader.readBinary(infile, wasm);
} catch (ParseException& p) {
p.dump(std::cerr);
Fatal() << "error in parsing wasm binary";
}
if (options.debug) {
WasmPrinter::printModule(&wasm, std::cerr);
}
uint32_t dataSize = 0;
for (auto §ion : wasm.userSections) {
if (section.name == "linking") {
parseLinkingSection(section.data, dataSize);
}
}
std::vector<Name> initializerFunctions;
initializerFunctions.push_back("__wasm_call_ctors");
EmscriptenGlueGenerator generator(wasm);
std::string metadata = generator.generateEmscriptenMetadata(dataSize, initializerFunctions);
Output output(outfile, Flags::Text, Flags::Release);
output << metadata;
return 0;
}
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