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#include <iostream>
#include <fstream>
#include <cstdlib>
#include <string>
#include <cinttypes>
#include "wasm.hh"
// A function to be called from Wasm code.
auto fail_callback(
void* env, const wasm::Val args[], wasm::Val results[]
) -> wasm::own<wasm::Trap> {
std::cout << "Calling back..." << std::endl;
auto store = reinterpret_cast<wasm::Store*>(env);
auto message = wasm::Name::make(std::string("callback abort"));
return wasm::Trap::make(store, message);
}
void print_frame(const wasm::Frame* frame) {
std::cout << "> " << frame->instance();
std::cout << " @ 0x" << std::hex << frame->module_offset();
std::cout << " = " << frame->func_index();
std::cout << ".0x" << std::hex << frame->func_offset() << std::endl;
}
void run() {
// Initialize.
std::cout << "Initializing..." << std::endl;
auto engine = wasm::Engine::make();
auto store_ = wasm::Store::make(engine.get());
auto store = store_.get();
// Load binary.
std::cout << "Loading binary..." << std::endl;
std::ifstream file("trap.wasm");
file.seekg(0, std::ios_base::end);
auto file_size = file.tellg();
file.seekg(0);
auto binary = wasm::vec<byte_t>::make_uninitialized(file_size);
file.read(binary.get(), file_size);
file.close();
if (file.fail()) {
std::cout << "> Error loading module!" << std::endl;
exit(1);
}
// Compile.
std::cout << "Compiling module..." << std::endl;
auto module = wasm::Module::make(store, binary);
if (!module) {
std::cout << "> Error compiling module!" << std::endl;
exit(1);
}
// Create external print functions.
std::cout << "Creating callback..." << std::endl;
auto fail_type = wasm::FuncType::make(
wasm::ownvec<wasm::ValType>::make(),
wasm::ownvec<wasm::ValType>::make(wasm::ValType::make(wasm::I32))
);
auto fail_func =
wasm::Func::make(store, fail_type.get(), fail_callback, store);
// Instantiate.
std::cout << "Instantiating module..." << std::endl;
wasm::Extern* imports[] = {fail_func.get()};
auto instance = wasm::Instance::make(store, module.get(), imports);
if (!instance) {
std::cout << "> Error instantiating module!" << std::endl;
exit(1);
}
// Extract export.
std::cout << "Extracting exports..." << std::endl;
auto exports = instance->exports();
if (exports.size() < 2 ||
exports[0]->kind() != wasm::EXTERN_FUNC || !exports[0]->func() ||
exports[1]->kind() != wasm::EXTERN_FUNC || !exports[1]->func()) {
std::cout << "> Error accessing exports!" << std::endl;
exit(1);
}
// Call.
for (size_t i = 0; i < 2; ++i) {
std::cout << "Calling export " << i << "..." << std::endl;
auto trap = exports[i]->func()->call();
if (!trap) {
std::cout << "> Error calling function, expected trap!" << std::endl;
exit(1);
}
std::cout << "Printing message..." << std::endl;
std::cout << "> " << trap->message().get() << std::endl;
std::cout << "Printing origin..." << std::endl;
auto frame = trap->origin();
if (frame) {
print_frame(frame.get());
} else {
std::cout << "> Empty origin." << std::endl;
}
std::cout << "Printing trace..." << std::endl;
auto trace = trap->trace();
if (trace.size() > 0) {
for (size_t i = 0; i < trace.size(); ++i) {
print_frame(trace[i].get());
}
} else {
std::cout << "> Empty trace." << std::endl;
}
}
// Shut down.
std::cout << "Shutting down..." << std::endl;
}
int main(int argc, const char* argv[]) {
run();
std::cout << "Done." << std::endl;
return 0;
}
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