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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.
*/
#include <algorithm>
#include <cassert>
#include <cstdio>
#include <cstdlib>
#include <memory>
#include <string>
#include <vector>
#include "src/binary-reader.h"
#include "src/error-formatter.h"
#include "src/feature.h"
#include "src/interp/binary-reader-interp.h"
#include "src/interp/interp-util.h"
#include "src/interp/interp.h"
#include "src/option-parser.h"
#include "src/stream.h"
using namespace wabt;
using namespace wabt::interp;
static int s_verbose;
static const char* s_infile;
static Thread::Options s_thread_options;
static Stream* s_trace_stream;
static bool s_run_all_exports;
static bool s_host_print;
static bool s_dummy_import_func;
static Features s_features;
static std::unique_ptr<FileStream> s_log_stream;
static std::unique_ptr<FileStream> s_stdout_stream;
static Store s_store;
static const char s_description[] =
R"( read a file in the wasm binary format, and run in it a stack-based
interpreter.
examples:
# parse binary file test.wasm, and type-check it
$ wasm-interp test.wasm
# parse test.wasm and run all its exported functions
$ wasm-interp test.wasm --run-all-exports
# parse test.wasm, run the exported functions and trace the output
$ wasm-interp test.wasm --run-all-exports --trace
# parse test.wasm and run all its exported functions, setting the
# value stack size to 100 elements
$ wasm-interp test.wasm -V 100 --run-all-exports
)";
static void ParseOptions(int argc, char** argv) {
OptionParser parser("wasm-interp", s_description);
parser.AddOption('v', "verbose", "Use multiple times for more info", []() {
s_verbose++;
s_log_stream = FileStream::CreateStdout();
});
s_features.AddOptions(&parser);
parser.AddOption('V', "value-stack-size", "SIZE",
"Size in elements of the value stack",
[](const std::string& argument) {
// TODO(binji): validate.
s_thread_options.value_stack_size = atoi(argument.c_str());
});
parser.AddOption('C', "call-stack-size", "SIZE",
"Size in elements of the call stack",
[](const std::string& argument) {
// TODO(binji): validate.
s_thread_options.call_stack_size = atoi(argument.c_str());
});
parser.AddOption('t', "trace", "Trace execution",
[]() { s_trace_stream = s_stdout_stream.get(); });
parser.AddOption(
"run-all-exports",
"Run all the exported functions, in order. Useful for testing",
[]() { s_run_all_exports = true; });
parser.AddOption("host-print",
"Include an importable function named \"host.print\" for "
"printing to stdout",
[]() { s_host_print = true; });
parser.AddOption(
"dummy-import-func",
"Provide a dummy implementation of all imported functions. The function "
"will log the call and return an appropriate zero value.",
[]() { s_dummy_import_func = true; });
parser.AddArgument("filename", OptionParser::ArgumentCount::One,
[](const char* argument) { s_infile = argument; });
parser.Parse(argc, argv);
}
Result RunAllExports(const Instance::Ptr& instance, Errors* errors) {
Result result = Result::Ok;
auto module = s_store.UnsafeGet<Module>(instance->module());
auto&& module_desc = module->desc();
for (auto&& export_ : module_desc.exports) {
if (export_.type.type->kind != ExternalKind::Func) {
continue;
}
auto* func_type = cast<FuncType>(export_.type.type.get());
if (func_type->params.empty()) {
if (s_trace_stream) {
s_trace_stream->Writef(">>> running export \"%s\":\n",
export_.type.name.c_str());
}
auto func = s_store.UnsafeGet<Func>(instance->funcs()[export_.index]);
Values params;
Values results;
Trap::Ptr trap;
result |= func->Call(s_store, params, results, &trap, s_trace_stream);
WriteCall(s_stdout_stream.get(), export_.type.name, *func_type, params,
results, trap);
}
}
return result;
}
Result ReadAndInstantiateModule(const char* module_filename,
Errors* errors,
Instance::Ptr* out_instance) {
auto* stream = s_stdout_stream.get();
std::vector<uint8_t> file_data;
CHECK_RESULT(ReadFile(module_filename, &file_data));
ModuleDesc module_desc;
const bool kReadDebugNames = true;
const bool kStopOnFirstError = true;
const bool kFailOnCustomSectionError = true;
ReadBinaryOptions options(s_features, s_log_stream.get(), kReadDebugNames,
kStopOnFirstError, kFailOnCustomSectionError);
CHECK_RESULT(ReadBinaryInterp(file_data.data(), file_data.size(), options,
errors, &module_desc));
if (s_verbose) {
module_desc.istream.Disassemble(stream);
}
auto module = Module::New(s_store, module_desc);
RefVec imports;
for (auto&& import : module_desc.imports) {
if (import.type.type->kind == ExternKind::Func &&
((s_host_print && import.type.module == "host" &&
import.type.name == "print") ||
s_dummy_import_func)) {
auto func_type = *cast<FuncType>(import.type.type.get());
auto import_name = StringPrintf("%s.%s", import.type.module.c_str(),
import.type.name.c_str());
auto host_func =
HostFunc::New(s_store, func_type,
[=](const Values& params, Values& results,
Trap::Ptr* trap) -> Result {
printf("called host ");
WriteCall(stream, import_name, func_type, params,
results, *trap);
return Result::Ok;
});
imports.push_back(host_func.ref());
continue;
}
// By default, just push an null reference. This won't resolve, and
// instantiation will fail.
imports.push_back(Ref::Null);
}
RefPtr<Trap> trap;
*out_instance = Instance::Instantiate(s_store, module.ref(), imports, &trap);
if (!*out_instance) {
// TODO: change to "initializing"
WriteTrap(stream, "error initialiazing module", trap);
return Result::Error;
}
return Result::Ok;
}
static Result ReadAndRunModule(const char* module_filename) {
Errors errors;
Instance::Ptr instance;
Result result = ReadAndInstantiateModule(module_filename, &errors, &instance);
if (Succeeded(result) && s_run_all_exports) {
RunAllExports(instance, &errors);
}
FormatErrorsToFile(errors, Location::Type::Binary);
return result;
}
int ProgramMain(int argc, char** argv) {
InitStdio();
s_stdout_stream = FileStream::CreateStdout();
ParseOptions(argc, argv);
wabt::Result result = ReadAndRunModule(s_infile);
return result != wabt::Result::Ok;
}
int main(int argc, char** argv) {
WABT_TRY
return ProgramMain(argc, argv);
WABT_CATCH_BAD_ALLOC_AND_EXIT
}
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