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wasm2js.js
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280 lines (263 loc) · 7.99 KB
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// wasm2js.js - enough of a polyfill for the WebAssembly object so that we can load
// wasm2js code that way. Similar to the same file in emscripten, but tailored for
// fuzzing purposes here.
var WebAssembly = {
Memory: function(opts) {
return {
buffer: new ArrayBuffer(opts['initial'] * 64 * 1024),
};
},
Table: function(opts) {
var ret = new Array(opts['initial']);
ret.grow = function(by) {
ret.push(null);
};
ret.set = function(i, func) {
ret[i] = func;
};
ret.get = function(i) {
return ret[i];
};
return ret;
},
Module: function(binary) {
// TODO: use the binary and info somehow - right now the wasm2js output is embedded in
// the main JS
return {};
},
Instance: function(module, info) {
// TODO: use the module and info somehow - right now the wasm2js output is embedded in
// the main JS
var decodeBase64 = typeof atob === 'function' ? atob : function (input) {
var keyStr = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=';
var output = '';
var chr1, chr2, chr3;
var enc1, enc2, enc3, enc4;
var i = 0;
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, '');
do {
enc1 = keyStr.indexOf(input.charAt(i++));
enc2 = keyStr.indexOf(input.charAt(i++));
enc3 = keyStr.indexOf(input.charAt(i++));
enc4 = keyStr.indexOf(input.charAt(i++));
chr1 = (enc1 << 2) | (enc2 >> 4);
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
chr3 = ((enc3 & 3) << 6) | enc4;
output = output + String.fromCharCode(chr1);
if (enc3 !== 64) {
output = output + String.fromCharCode(chr2);
}
if (enc4 !== 64) {
output = output + String.fromCharCode(chr3);
}
} while (i < input.length);
return output;
};
var atob = decodeBase64;
// Additional imports
info['env']['__tempMemory__'] = 0; // risky!
// This will be replaced by the actual wasm2js code.
var exports = instantiate(info, wasmMemory);
// Save the exports on the module object, so that
// WebAssembly.Module.exports() works. Ideally we would do this in
// WebAssembly.Module(), but we don't know the exports at that point - all
// the actual work happens in Instance(), here. In practice this is enough
// as calls to WebAssembly.Module.exports() from the fuzzer happen after
// instantiation.
module.exports = exports;
return {
'exports': exports
};
},
instantiate: function(binary, info) {
return {
then: function(ok, err) {
ok({
'instance': new WebAssembly.Instance(new WebAssembly.Module(binary, info))
});
}
};
}
};
// Add the exports() API on top of the Module constructor.
WebAssembly.Module.exports = (module) => {
var ret = [];
for (var key in module.exports) {
ret.push({ name: key });
}
return ret;
};
var tempRet0 = 0;
var env = {
log_i32: function(x) {
console.log('[LoggingExternalInterface logging ' + literal(x, 'i32') + ']');
},
log_i64: function(x, h) {
console.log('[LoggingExternalInterface logging ' + literal(x, 'i32') + ' ' + literal(h, 'i32') + ']');
},
log_f32: function(x) {
console.log('[LoggingExternalInterface logging ' + literal(x, 'f64') + ']');
},
log_f64: function(x) {
console.log('[LoggingExternalInterface logging ' + literal(x, 'f64') + ']');
},
log_execution: function(loc) {
console.log('log_execution ' + loc);
},
setTempRet0: function(x) {
tempRet0 = x;
},
getTempRet0: function() {
return x;
},
get_i32: function(loc, index, value) {
console.log('get_i32 ' + [loc, index, value]);
return value;
},
get_i64: function(loc, index, low, high) {
console.log('get_i64 ' + [loc, index, low, high]);
env['setTempRet0'](high);
return low;
},
get_f32: function(loc, index, value) {
console.log('get_f32 ' + [loc, index, value]);
return value;
},
get_f64: function(loc, index, value) {
console.log('get_f64 ' + [loc, index, value]);
return value;
},
set_i32: function(loc, index, value) {
console.log('set_i32 ' + [loc, index, value]);
return value;
},
set_i64: function(loc, index, low, high) {
console.log('set_i64 ' + [loc, index, low, high]);
env['setTempRet0'](high);
return low;
},
set_f32: function(loc, index, value) {
console.log('set_f32 ' + [loc, index, value]);
return value;
},
set_f64: function(loc, index, value) {
console.log('set_f64 ' + [loc, index, value]);
return value;
},
load_ptr: function(loc, bytes, offset, ptr) {
console.log('load_ptr ' + [loc, bytes, offset, ptr]);
return ptr;
},
load_val_i32: function(loc, value) {
console.log('load_val_i32 ' + [loc, value]);
return value;
},
load_val_i64: function(loc, low, high) {
console.log('load_val_i64 ' + [loc, low, high]);
env['setTempRet0'](high);
return low;
},
load_val_f32: function(loc, value) {
console.log('load_val_f32 ' + [loc, value]);
return value;
},
load_val_f64: function(loc, value) {
console.log('load_val_f64 ' + [loc, value]);
return value;
},
store_ptr: function(loc, bytes, offset, ptr) {
console.log('store_ptr ' + [loc, bytes, offset, ptr]);
return ptr;
},
store_val_i32: function(loc, value) {
console.log('store_val_i32 ' + [loc, value]);
return value;
},
store_val_i64: function(loc, low, high) {
console.log('store_val_i64 ' + [loc, low, high]);
env['setTempRet0'](high);
return low;
},
store_val_f32: function(loc, value) {
console.log('store_val_f32 ' + [loc, value]);
return value;
},
store_val_f64: function(loc, value) {
console.log('store_val_f64 ' + [loc, value]);
return value;
},
struct_get_val_i32: function(loc, value) {
console.log('struct_get_val_i32 ' + [loc, value]);
return value;
},
struct_get_val_i64: function(loc, value) {
console.log('struct_get_val_i64 ' + [loc, value]);
return value;
},
struct_get_val_f32: function(loc, value) {
console.log('struct_get_val_f32 ' + [loc, value]);
return value;
},
struct_get_val_f64: function(loc, value) {
console.log('struct_get_val_f64 ' + [loc, value]);
return value;
},
struct_set_val_i32: function(loc, value) {
console.log('struct_set_val_i32 ' + [loc, value]);
return value;
},
struct_set_val_i64: function(loc, value) {
console.log('struct_set_val_i64 ' + [loc, value]);
return value;
},
struct_set_val_f32: function(loc, value) {
console.log('struct_set_val_f32 ' + [loc, value]);
return value;
},
struct_set_val_f64: function(loc, value) {
console.log('struct_set_val_f64 ' + [loc, value]);
return value;
},
array_get_val_i32: function(loc, value) {
console.log('array_get_val_i32 ' + [loc, value]);
return value;
},
array_get_val_i64: function(loc, value) {
console.log('array_get_val_i64 ' + [loc, value]);
return value;
},
array_get_val_f32: function(loc, value) {
console.log('array_get_val_f32 ' + [loc, value]);
return value;
},
array_get_val_f64: function(loc, value) {
console.log('array_get_val_f64 ' + [loc, value]);
return value;
},
array_set_val_i32: function(loc, value) {
console.log('array_set_val_i32 ' + [loc, value]);
return value;
},
array_set_val_i64: function(loc, value) {
console.log('array_set_val_i64 ' + [loc, value]);
return value;
},
array_set_val_f32: function(loc, value) {
console.log('array_set_val_f32 ' + [loc, value]);
return value;
},
array_set_val_f64: function(loc, value) {
console.log('array_set_val_f64 ' + [loc, value]);
return value;
},
array_get_index: function(loc, value) {
console.log('array_get_index ' + [loc, value]);
return value;
},
array_set_index: function(loc, value) {
console.log('array_set_index ' + [loc, value]);
return value;
},
};
var wasmMemory = new WebAssembly.Memory({ initial: 1 });