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//
// wasm intepreter for asm2wasm output, in a js environment. receives asm.js,
// generates a runnable module suitable as a polyfill.
//
// this polyfills an emscripten --separate-asm *.asm.js file, as a drop-in
// replacement. it writes the wasm module to Module.asm, and sets Module.buffer.
//
#include <emscripten.h>
#include "asm2wasm.h"
#include "wasm-interpreter.h"
using namespace cashew;
using namespace wasm;
// receives asm.js code, parses into wasm and returns an instance handle.
// this creates a module, an external interface, and a module instance,
// all of which are then the responsibility of the caller to free.
// note: this modifies the input.
extern "C" ModuleInstance* EMSCRIPTEN_KEEPALIVE load_asm(char *input) {
// emcc --separate-asm modules look like
//
// Module["asm"] = (function(global, env, buffer) {
// ..
// });
//
// we need to clean that up.
size_t num = strlen(input);
assert(*input == 'M');
while (*input != 'f') {
input++;
num--;
}
char *end = input + num - 1;
while (*end != '}') {
*end = 0;
end--;
}
if (debug) std::cerr << "parsing...\n";
cashew::Parser<Ref, DotZeroValueBuilder> builder;
Ref asmjs = builder.parseToplevel(input);
Module* wasm = new Module();
if (debug) std::cerr << "wasming...\n";
Asm2WasmBuilder asm2wasm(*wasm);
asm2wasm.processAsm(asmjs);
if (debug) std::cerr << "optimizing...\n";
asm2wasm.optimize();
if (debug) std::cerr << "returning instance.\n";
struct JSExternalInterface : ModuleInstance::ExternalInterface {
Literal callImport(Import *import, ModuleInstance::LiteralList& arguments) override {
EM_ASM({
Module['tempArguments'] = [];
});
for (auto& argument : arguments) {
if (argument.type == i32) {
EM_ASM_({ Module['tempArguments'].push($0) }, argument.geti32());
} else if (argument.type == f64) {
EM_ASM_({ Module['tempArguments'].push($0) }, argument.getf64());
} else {
abort();
}
}
return Literal(EM_ASM_DOUBLE({
var mod = Pointer_stringify($0);
var base = Pointer_stringify($1);
var tempArguments = Module['tempArguments'];
Module['tempArguments'] = null;
return Module['instance'][mod][base].apply(null, tempArguments);
}, import->module.str, import->base.str));
}
Literal load(Load* load, Literal ptr) override {
size_t addr = ptr.geti32();
assert(load->align == load->bytes);
if (!load->float_) {
if (load->bytes == 1) {
if (load->signed_) {
return Literal(EM_ASM_INT({ return Module['instance'].parent['HEAP8'][$0] }, addr));
} else {
return Literal(EM_ASM_INT({ return Module['instance'].parent['HEAPU8'][$0] }, addr));
}
} else if (load->bytes == 2) {
if (load->signed_) {
return Literal(EM_ASM_INT({ return Module['instance'].parent['HEAP16'][$0] }, addr));
} else {
return Literal(EM_ASM_INT({ return Module['instance'].parent['HEAPU16'][$0] }, addr));
}
} else if (load->bytes == 4) {
if (load->signed_) {
return Literal(EM_ASM_INT({ return Module['instance'].parent['HEAP32'][$0] }, addr));
} else {
return Literal(EM_ASM_INT({ return Module['instance'].parent['HEAPU32'][$0] }, addr));
}
}
abort();
} else {
if (load->bytes == 4) {
return Literal(EM_ASM_DOUBLE({ return Module['instance'].parent['HEAPF32'][$0] }, addr));
} else if (load->bytes == 8) {
return Literal(EM_ASM_DOUBLE({ return Module['instance'].parent['HEAPF64'][$0] }, addr));
}
abort();
}
}
void store(Store* store, Literal ptr, Literal value) override {
size_t addr = ptr.geti32();
assert(store->align == store->bytes);
if (!store->float_) {
if (store->bytes == 1) {
EM_ASM_INT({ Module['instance'].parent['HEAP8'][$0] = $1 }, addr, value.geti32());
} else if (store->bytes == 2) {
EM_ASM_INT({ Module['instance'].parent['HEAP16'][$0] = $1 }, addr, value.geti32());
} else if (store->bytes == 4) {
EM_ASM_INT({ Module['instance'].parent['HEAP32'][$0] = $1 }, addr, value.geti32());
}
abort();
} else {
if (store->bytes == 4) {
EM_ASM_DOUBLE({ Module['instance'].parent['HEAPF32'][$0] = $1 }, addr, value.getf64());
} else if (store->bytes == 8) {
EM_ASM_DOUBLE({ Module['instance'].parent['HEAPF64'][$0] = $1 }, addr, value.getf64());
}
abort();
}
}
};
return new ModuleInstance(*wasm, new JSExternalInterface());
}
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