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/*
* Copyright 2018 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.
*/
#include <set>
#include "wabt/binary-reader-nop.h"
#include "wabt/binary-reader.h"
#include "wabt/binary.h"
#include "wabt/error-formatter.h"
#include "wabt/leb128.h"
#include "wabt/option-parser.h"
#include "wabt/stream.h"
using namespace wabt;
static std::string s_filename;
static std::string s_outfile;
static std::set<std::string_view> v_sections_to_keep{};
static std::set<std::string_view> v_sections_to_remove{};
static const char s_description[] =
R"( Remove sections of a WebAssembly binary file.
examples:
# Remove all custom sections from test.wasm
$ wasm-strip test.wasm
)";
static void ParseOptions(int argc, char** argv) {
OptionParser parser("wasm-strip", s_description);
parser.AddArgument("filename", OptionParser::ArgumentCount::One,
[](const char* argument) {
s_filename = argument;
ConvertBackslashToSlash(&s_filename);
});
parser.AddOption('o', "output", "FILE", "output wasm binary file",
[](const char* argument) { s_outfile = argument; });
parser.AddOption('k', "keep-section", "SECTION NAME",
"Section name to keep in the final output",
[](const char* value) {
v_sections_to_keep.insert(std::string_view{value});
});
parser.AddOption('R', "remove-section", "SECTION NAME",
"Section to specifically remove, including all the rest",
[](const char* value) {
v_sections_to_remove.insert(std::string_view{value});
});
parser.Parse(argc, argv);
}
class BinaryReaderStrip : public BinaryReaderNop {
public:
explicit BinaryReaderStrip(std::set<std::string_view> sections_to_keep,
std::set<std::string_view> sections_to_remove,
Errors* errors)
: errors_(errors),
sections_to_keep_(sections_to_keep),
sections_to_remove_(sections_to_remove),
section_start_(0) {
stream_.WriteU32(WABT_BINARY_MAGIC, "WASM_BINARY_MAGIC");
stream_.WriteU32(WABT_BINARY_VERSION, "WASM_BINARY_VERSION");
}
bool OnError(const Error& error) override {
errors_->push_back(error);
return true;
}
Result BeginSection(Index section_index,
BinarySection section_type,
Offset size) override {
section_start_ = state->offset;
if (section_type == BinarySection::Custom) {
return Result::Ok;
}
stream_.WriteU8Enum(section_type, "section code");
WriteU32Leb128(&stream_, size, "section size");
stream_.WriteData(state->data + state->offset, size, "section data");
return Result::Ok;
}
Result WriteToFile(std::string_view filename) {
return stream_.WriteToFile(filename);
}
Result BeginCustomSection(Index section_index,
Offset size,
std::string_view section_name) override {
if (sections_to_remove_.count(section_name) > 0) {
return Result::Ok;
}
if (sections_to_keep_.count(section_name) > 0 ||
!sections_to_remove_.empty()) {
stream_.WriteU8Enum(BinarySection::Custom, "section code");
WriteU32Leb128(&stream_, size, "section size");
stream_.WriteData(state->data + section_start_, size, "section data");
}
return Result::Ok;
}
private:
MemoryStream stream_;
Errors* errors_;
std::set<std::string_view> sections_to_keep_;
std::set<std::string_view> sections_to_remove_;
Offset section_start_;
};
int ProgramMain(int argc, char** argv) {
Result result;
InitStdio();
ParseOptions(argc, argv);
std::vector<uint8_t> file_data;
result = ReadFile(s_filename.c_str(), &file_data);
if (Failed(result)) {
return Result::Error;
}
Errors errors;
Features features;
features.EnableAll();
const bool kReadDebugNames = false;
const bool kStopOnFirstError = true;
const bool kFailOnCustomSectionError = false;
ReadBinaryOptions options(features, nullptr, kReadDebugNames,
kStopOnFirstError, kFailOnCustomSectionError);
BinaryReaderStrip reader(v_sections_to_keep, v_sections_to_remove, &errors);
result = ReadBinary(file_data.data(), file_data.size(), &reader, options);
FormatErrorsToFile(errors, Location::Type::Binary);
if (Failed(result)) {
return Result::Error;
}
if (s_outfile.empty()) {
s_outfile = s_filename;
}
return reader.WriteToFile(s_outfile);
}
int main(int argc, char** argv) {
WABT_TRY
return ProgramMain(argc, argv);
WABT_CATCH_BAD_ALLOC_AND_EXIT
}
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