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//
// A WebAssembly shell, loads a .wast file (WebAssembly in S-Expression format) and executes it.
//
#include <setjmp.h>
#include "wasm-s-parser.h"
#include "wasm-interpreter.h"
using namespace cashew;
using namespace wasm;
IString ASSERT_RETURN("assert_return"),
ASSERT_TRAP("assert_trap"),
ASSERT_INVALID("assert_invalid"),
STDIO("stdio"),
PRINT("print"),
INVOKE("invoke");
//
// Implementation of the shell interpreter execution environment
//
struct ShellExternalInterface : ModuleInstance::ExternalInterface {
char *memory;
size_t memorySize;
ShellExternalInterface() : memory(nullptr) {}
void init(Module& wasm) override {
memory = new char[wasm.memory.initial];
memorySize = wasm.memory.initial;
// apply memory segments
for (auto segment : wasm.memory.segments) {
memcpy(memory + segment.offset, segment.data, segment.size);
}
}
Literal callImport(Import *import, ModuleInstance::LiteralList& arguments) override {
if (import->module == STDIO && import->base == PRINT) {
for (auto argument : arguments) {
std::cout << argument << '\n';
}
return Literal();
}
std::cout << "callImport " << import->name.str << "\n";
abort();
}
Literal load(Load* load, size_t addr) override {
// ignore align - assume we are on x86 etc. which does that
switch (load->type) {
case i32: {
switch (load->bytes) {
case 1: return load->signed_ ? (int32_t)*((int8_t*)(memory+addr)) : (int32_t)*((uint8_t*)(memory+addr));
case 2: return load->signed_ ? (int32_t)*((int16_t*)(memory+addr)) : (int32_t)*((uint16_t*)(memory+addr));
case 4: return load->signed_ ? (int32_t)*((int32_t*)(memory+addr)) : (int32_t)*((uint32_t*)(memory+addr));
default: abort();
}
break;
}
case i64: {
switch (load->bytes) {
case 1: return load->signed_ ? (int64_t)*((int8_t*)(memory+addr)) : (int64_t)*((uint8_t*)(memory+addr));
case 2: return load->signed_ ? (int64_t)*((int16_t*)(memory+addr)) : (int64_t)*((uint16_t*)(memory+addr));
case 4: return load->signed_ ? (int64_t)*((int32_t*)(memory+addr)) : (int64_t)*((uint32_t*)(memory+addr));
case 8: return load->signed_ ? (int64_t)*((int64_t*)(memory+addr)) : (int64_t)*((uint64_t*)(memory+addr));
default: abort();
}
break;
}
case f32: return *((float*)(memory+addr));
case f64: return *((double*)(memory+addr));
default: abort();
}
}
void store(Store* store, size_t addr, Literal value) override {
// ignore align - assume we are on x86 etc. which does that
switch (store->type) {
case i32: {
switch (store->bytes) {
case 1: *((int8_t*)(memory+addr)) = value.geti32(); break;
case 2: *((int16_t*)(memory+addr)) = value.geti32(); break;
case 4: *((int32_t*)(memory+addr)) = value.geti32(); break;
default: abort();
}
break;
}
case i64: {
switch (store->bytes) {
case 1: *((int8_t*)(memory+addr)) = value.geti64(); break;
case 2: *((int16_t*)(memory+addr)) = value.geti64(); break;
case 4: *((int32_t*)(memory+addr)) = value.geti64(); break;
case 8: *((int64_t*)(memory+addr)) = value.geti64(); break;
default: abort();
}
break;
}
case f32: *((float*)(memory+addr)) = value.getf32(); break;
case f64: *((double*)(memory+addr)) = value.getf64(); break;
default: abort();
}
}
jmp_buf trapState;
void trap() override {
longjmp(trapState, 1);
}
};
//
// An invocation into a module
//
struct Invocation {
ModuleInstance* instance;
IString name;
ModuleInstance::LiteralList arguments;
Invocation(Element& invoke, ModuleInstance* instance, SExpressionWasmBuilder& builder) : instance(instance) {
assert(invoke[0]->str() == INVOKE);
name = invoke[1]->str();
for (size_t j = 2; j < invoke.size(); j++) {
Expression* argument = builder.parseExpression(*invoke[j]);
arguments.push_back(argument->dyn_cast<Const>()->value);
}
}
Literal invoke() {
return instance->callFunction(name, arguments);
}
};
//
// main
//
int main(int argc, char **argv) {
debug = getenv("WASM_SHELL_DEBUG") ? getenv("WASM_SHELL_DEBUG")[0] - '0' : 0;
char *infile = argv[1];
bool print_wasm = argc >= 3; // second arg means print it out
if (debug) std::cerr << "loading '" << infile << "'...\n";
FILE *f = fopen(argv[1], "r");
assert(f);
fseek(f, 0, SEEK_END);
int size = ftell(f);
char *input = new char[size+1];
rewind(f);
int num = fread(input, 1, size, f);
// On Windows, ftell() gives the byte position (\r\n counts as two bytes), but when
// reading, fread() returns the number of characters read (\r\n is read as one char \n, and counted as one),
// so return value of fread can be less than size reported by ftell, and that is normal.
assert((num > 0 || size == 0) && num <= size);
fclose(f);
input[num] = 0;
if (debug) std::cerr << "parsing text to s-expressions...\n";
SExpressionParser parser(input);
Element& root = *parser.root;
if (debug) std::cout << root << '\n';
// A .wast may have multiple modules, with some asserts after them
size_t i = 0;
while (i < root.size()) {
if (debug) std::cerr << "parsing s-expressions to wasm...\n";
Module wasm;
SExpressionWasmBuilder builder(wasm, *root[i], [&]() { abort(); });
i++;
auto interface = new ShellExternalInterface();
auto instance = new ModuleInstance(wasm, interface);
if (print_wasm) {
if (debug) std::cerr << "printing...\n";
std::cout << wasm;
}
// run asserts
while (i < root.size()) {
Element& curr = *root[i];
IString id = curr[0]->str();
if (id == MODULE) break;
Colors::red(std::cerr);
std::cerr << i << '/' << (root.size()-1);
Colors::green(std::cerr);
std::cerr << " CHECKING: ";
Colors::normal(std::cerr);
std::cerr << curr << '\n';
if (id == ASSERT_INVALID) {
// a module invalidity test
Module wasm;
bool invalid = false;
jmp_buf trapState;
if (setjmp(trapState) == 0) {
SExpressionWasmBuilder builder(wasm, *curr[1], [&]() {
invalid = true;
longjmp(trapState, 1);
});
}
if (!invalid) {
// maybe parsed ok, but otherwise incorrect
invalid = !wasm.validate();
}
assert(invalid);
} else if (id == INVOKE) {
Invocation invocation(curr, instance, builder);
invocation.invoke();
} else {
// an invoke test
Invocation invocation(*curr[1], instance, builder);
bool trapped = false;
Literal result;
if (setjmp(interface->trapState) == 0) {
result = invocation.invoke();
} else {
trapped = true;
}
if (id == ASSERT_RETURN) {
assert(!trapped);
Literal expected;
if (curr.size() >= 3) {
expected = builder.parseExpression(*curr[2])->dyn_cast<Const>()->value;
}
std::cerr << "seen " << result << ", expected " << expected << '\n';
assert(expected == result);
}
if (id == ASSERT_TRAP) assert(trapped);
}
i++;
}
}
if (debug) {
Colors::green(std::cerr);
Colors::bold(std::cerr);
std::cerr << "\ndone.\n";
Colors::normal(std::cerr);
}
}
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