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wat.js
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wat.js
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// lib/const.js
var BYTE = {
"type.i32": 127,
"type.i64": 126,
"type.f32": 125,
"type.f64": 124,
"type.void": 64,
"type.func": 96,
"type.funcref": 112,
"section.custom": 0,
"section.type": 1,
"section.import": 2,
"section.function": 3,
"section.table": 4,
"section.memory": 5,
"section.global": 6,
"section.export": 7,
"section.start": 8,
"section.element": 9,
"section.code": 10,
"section.data": 11,
"import.func": 0,
"import.table": 1,
"import.memory": 2,
"import.global": 3,
"export.function": 0,
"export.table": 1,
"export.memory": 2,
"export.global": 3,
"global.const": 0,
"global.var": 1,
"global.mut": 1,
"limits.min": 0,
"limits.minmax": 1,
"limits.shared": 3
};
var opCodes = [
"unreachable",
"nop",
"block",
"loop",
"if",
"else",
,
,
,
,
,
"end",
"br",
"br_if",
"br_table",
"return",
"call",
"call_indirect",
,
,
,
,
,
,
,
,
"drop",
"select",
,
,
,
,
"local.get",
"local.set",
"local.tee",
"global.get",
"global.set",
,
,
,
"i32.load",
"i64.load",
"f32.load",
"f64.load",
"i32.load8_s",
"i32.load8_u",
"i32.load16_s",
"i32.load16_u",
"i64.load8_s",
"i64.load8_u",
"i64.load16_s",
"i64.load16_u",
"i64.load32_s",
"i64.load32_u",
"i32.store",
"i64.store",
"f32.store",
"f64.store",
"i32.store8",
"i32.store16",
"i64.store8",
"i64.store16",
"i64.store32",
"memory.size",
"memory.grow",
"i32.const",
"i64.const",
"f32.const",
"f64.const",
"i32.eqz",
"i32.eq",
"i32.ne",
"i32.lt_s",
"i32.lt_u",
"i32.gt_s",
"i32.gt_u",
"i32.le_s",
"i32.le_u",
"i32.ge_s",
"i32.ge_u",
"i64.eqz",
"i64.eq",
"i64.ne",
"i64.lt_s",
"i64.lt_u",
"i64.gt_s",
"i64.gt_u",
"i64.le_s",
"i64.le_u",
"i64.ge_s",
"i64.ge_u",
"f32.eq",
"f32.ne",
"f32.lt",
"f32.gt",
"f32.le",
"f32.ge",
"f64.eq",
"f64.ne",
"f64.lt",
"f64.gt",
"f64.le",
"f64.ge",
"i32.clz",
"i32.ctz",
"i32.popcnt",
"i32.add",
"i32.sub",
"i32.mul",
"i32.div_s",
"i32.div_u",
"i32.rem_s",
"i32.rem_u",
"i32.and",
"i32.or",
"i32.xor",
"i32.shl",
"i32.shr_s",
"i32.shr_u",
"i32.rotl",
"i32.rotr",
"i64.clz",
"i64.ctz",
"i64.popcnt",
"i64.add",
"i64.sub",
"i64.mul",
"i64.div_s",
"i64.div_u",
"i64.rem_s",
"i64.rem_u",
"i64.and",
"i64.or",
"i64.xor",
"i64.shl",
"i64.shr_s",
"i64.shr_u",
"i64.rotl",
"i64.rotr",
"f32.abs",
"f32.neg",
"f32.ceil",
"f32.floor",
"f32.trunc",
"f32.nearest",
"f32.sqrt",
"f32.add",
"f32.sub",
"f32.mul",
"f32.div",
"f32.min",
"f32.max",
"f32.copysign",
"f64.abs",
"f64.neg",
"f64.ceil",
"f64.floor",
"f64.trunc",
"f64.nearest",
"f64.sqrt",
"f64.add",
"f64.sub",
"f64.mul",
"f64.div",
"f64.min",
"f64.max",
"f64.copysign",
"i32.wrap_i64",
"i32.trunc_f32_s",
"i32.trunc_f32_u",
"i32.trunc_f64_s",
"i32.trunc_f64_u",
"i64.extend_i32_s",
"i64.extend_i32_u",
"i64.trunc_f32_s",
"i64.trunc_f32_u",
"i64.trunc_f64_s",
"i64.trunc_f64_u",
"f32.convert_i32_s",
"f32.convert_i32_u",
"f32.convert_i64_s",
"f32.convert_i64_u",
"f32.demote_f64",
"f64.convert_i32_s",
"f64.convert_i32_u",
"f64.convert_i64_s",
"f64.convert_i64_u",
"f64.promote_f32",
"i32.reinterpret_f32",
"i64.reinterpret_f64",
"f32.reinterpret_i32",
"f64.reinterpret_i64"
];
var alias = {
"get_local": "local.get",
"set_local": "local.set",
"tee_local": "local.tee",
"get_global": "global.get",
"set_global": "global.set",
"i32.trunc_s/f32": "i32.trunc_f32_s",
"i32.trunc_u/f32": "i32.trunc_f32_u",
"i32.trunc_s/f64": "i32.trunc_f64_s",
"i32.trunc_u/f64": "i32.trunc_f64_u",
"i64.extend_s/i32": "i64.extend_i32_s",
"i64.extend_u/i32": "i64.extend_i32_u",
"i64.trunc_s/f32": "i64.trunc_f32_s",
"i64.trunc_u/f32": "i64.trunc_f32_u",
"i64.trunc_s/f64": "i64.trunc_f64_s",
"i64.trunc_u/f64": "i64.trunc_f64_u",
"f32.convert_s/i32": "f32.convert_i32_s",
"f32.convert_u/i32": "f32.convert_i32_u",
"f32.convert_s/i64": "f32.convert_i64_s",
"f32.convert_u/i64": "f32.convert_i64_u",
"f32.demote/f64": "f32.demote_f64",
"f64.convert_s/i32": "f64.convert_i32_s",
"f64.convert_u/i32": "f64.convert_i32_u",
"f64.convert_s/i64": "f64.convert_i64_s",
"f64.convert_u/i64": "f64.convert_i64_u",
"f64.promote/f32": "f64.promote_f32"
};
for (const [i, op] of opCodes.entries()) {
if (op != null) {
BYTE[op] = i;
}
}
BYTE["i32.trunc_sat_f64_s"] = [252, 2];
for (const name in alias) {
const i = opCodes.indexOf(alias[name]);
BYTE[name] = i;
}
var INSTR = {};
for (const op in BYTE) {
INSTR[op] = wrap_instr(op);
const [group, method] = op.split(".");
if (method != null) {
BYTE[group] = BYTE[group] ?? {};
BYTE[group][method] = BYTE[op];
INSTR[group] = INSTR[group] ?? {};
INSTR[group][method] = wrap_instr(op);
}
}
var ALIGN = {
"i32.load": 4,
"i64.load": 8,
"f32.load": 4,
"f64.load": 8,
"i32.load8_s": 1,
"i32.load8_u": 1,
"i32.load16_s": 2,
"i32.load16_u": 2,
"i64.load8_s": 1,
"i64.load8_u": 1,
"i64.load16_s": 2,
"i64.load16_u": 2,
"i64.load32_s": 4,
"i64.load32_u": 4,
"i32.store": 4,
"i64.store": 8,
"f32.store": 4,
"f64.store": 8,
"i32.store8": 1,
"i32.store16": 2,
"i64.store8": 1,
"i64.store16": 2,
"i64.store32": 4
};
// lib/leb128.js
function* bigint(n) {
n = to_int64(n);
while (true) {
const byte = Number(n & 0x7Fn);
n >>= 7n;
if (n === 0n && (byte & 64) === 0 || n === -1n && (byte & 64) !== 0) {
yield byte;
break;
}
yield byte | 128;
}
}
function* int(value) {
let byte = 0;
const size = Math.ceil(Math.log2(Math.abs(value)));
const negative = value < 0;
let more = true;
while (more) {
byte = value & 127;
value = value >> 7;
if (negative) {
value = value | -(1 << size - 7);
}
if (value == 0 && (byte & 64) == 0 || value == -1 && (byte & 64) == 64) {
more = false;
} else {
byte = byte | 128;
}
yield byte;
}
}
function* uint(value, pad = 0) {
if (value < 0)
throw new TypeError("uint value must be positive, received: " + value);
let byte = 0;
do {
byte = value & 127;
value = value >> 7;
if (value != 0 || pad > 0) {
byte = byte | 128;
}
yield byte;
pad--;
} while (value != 0 || pad > -1);
}
var byteView = new DataView(new BigInt64Array(1).buffer);
function to_int64(value) {
byteView.setBigInt64(0, value);
return byteView.getBigInt64(0);
}
function* f32(value) {
byteView.setFloat32(0, value);
for (let i = 4; i--; )
yield byteView.getUint8(i);
}
function* f64(value) {
byteView.setFloat64(0, value);
for (let i = 8; i--; )
yield byteView.getUint8(i);
}
function hex2float(input) {
input = input.toUpperCase();
const splitIndex = input.indexOf("P");
let mantissa, exponent;
if (splitIndex !== -1) {
mantissa = input.substring(0, splitIndex);
exponent = parseInt(input.substring(splitIndex + 1));
} else {
mantissa = input;
exponent = 0;
}
const dotIndex = mantissa.indexOf(".");
if (dotIndex !== -1) {
let integerPart = parseInt(mantissa.substring(0, dotIndex), 16);
const sign = Math.sign(integerPart);
integerPart = sign * integerPart;
const fractionLength = mantissa.length - dotIndex - 1;
const fractionalPart = parseInt(mantissa.substring(dotIndex + 1), 16);
const fraction = fractionLength > 0 ? fractionalPart / Math.pow(16, fractionLength) : 0;
if (sign === 0) {
if (fraction === 0) {
mantissa = sign;
} else {
if (Object.is(sign, -0)) {
mantissa = -fraction;
} else {
mantissa = fraction;
}
}
} else {
mantissa = sign * (integerPart + fraction);
}
} else {
mantissa = parseInt(mantissa, 16);
}
return mantissa * (splitIndex !== -1 ? Math.pow(2, exponent) : 1);
}
var F32_SIGN = 2147483648;
var F32_NAN = 2139095040;
function* nanbox32(input) {
let value = parseInt(input.split("nan:")[1]);
value |= F32_NAN;
if (input[0] === "-")
value |= F32_SIGN;
byteView.setInt32(0, value);
for (let i = 4; i--; )
yield byteView.getUint8(i);
}
var F64_SIGN = 0x8000000000000000n;
var F64_NAN = 0x7ff0000000000000n;
function* nanbox64(input) {
let value = BigInt(input.split("nan:")[1]);
value |= F64_NAN;
if (input[0] === "-")
value |= F64_SIGN;
byteView.setBigInt64(0, value);
for (let i = 8; i--; )
yield byteView.getUint8(i);
}
// lib/binary.js
(function(l) {
function m() {
}
function k(a, c) {
a = a === void 0 ? "utf-8" : a;
c = c === void 0 ? { fatal: false } : c;
if (r.indexOf(a.toLowerCase()) === -1)
throw new RangeError("Failed to construct 'TextDecoder': The encoding label provided ('" + a + "') is invalid.");
if (c.fatal)
throw Error("Failed to construct 'TextDecoder': the 'fatal' option is unsupported.");
}
function t(a) {
return Buffer.from(a.buffer, a.byteOffset, a.byteLength).toString("utf-8");
}
function u(a) {
var c = URL.createObjectURL(new Blob([a], { type: "text/plain;charset=UTF-8" }));
try {
var f = new XMLHttpRequest();
f.open("GET", c, false);
f.send();
return f.responseText;
} catch (e) {
return q(a);
} finally {
URL.revokeObjectURL(c);
}
}
function q(a) {
for (var c = 0, f = Math.min(65536, a.length + 1), e = new Uint16Array(f), h = [], d = 0; ; ) {
var b = c < a.length;
if (!b || d >= f - 1) {
h.push(String.fromCharCode.apply(null, e.subarray(0, d)));
if (!b)
return h.join("");
a = a.subarray(c);
d = c = 0;
}
b = a[c++];
if ((b & 128) === 0)
e[d++] = b;
else if ((b & 224) === 192) {
var g = a[c++] & 63;
e[d++] = (b & 31) << 6 | g;
} else if ((b & 240) === 224) {
g = a[c++] & 63;
var n = a[c++] & 63;
e[d++] = (b & 31) << 12 | g << 6 | n;
} else if ((b & 248) === 240) {
g = a[c++] & 63;
n = a[c++] & 63;
var v = a[c++] & 63;
b = (b & 7) << 18 | g << 12 | n << 6 | v;
65535 < b && (b -= 65536, e[d++] = b >>> 10 & 1023 | 55296, b = 56320 | b & 1023);
e[d++] = b;
}
}
}
if (l.TextEncoder && l.TextDecoder)
return false;
var r = ["utf-8", "utf8", "unicode-1-1-utf-8"];
Object.defineProperty(m.prototype, "encoding", { value: "utf-8" });
m.prototype.encode = function(a, c) {
c = c === void 0 ? { stream: false } : c;
if (c.stream)
throw Error("Failed to encode: the 'stream' option is unsupported.");
c = 0;
for (var f = a.length, e = 0, h = Math.max(32, f + (f >>> 1) + 7), d = new Uint8Array(h >>> 3 << 3); c < f; ) {
var b = a.charCodeAt(c++);
if (55296 <= b && 56319 >= b) {
if (c < f) {
var g = a.charCodeAt(c);
(g & 64512) === 56320 && (++c, b = ((b & 1023) << 10) + (g & 1023) + 65536);
}
if (55296 <= b && 56319 >= b)
continue;
}
e + 4 > d.length && (h += 8, h *= 1 + c / a.length * 2, h = h >>> 3 << 3, g = new Uint8Array(h), g.set(d), d = g);
if ((b & 4294967168) === 0)
d[e++] = b;
else {
if ((b & 4294965248) === 0)
d[e++] = b >>> 6 & 31 | 192;
else if ((b & 4294901760) === 0)
d[e++] = b >>> 12 & 15 | 224, d[e++] = b >>> 6 & 63 | 128;
else if ((b & 4292870144) === 0)
d[e++] = b >>> 18 & 7 | 240, d[e++] = b >>> 12 & 63 | 128, d[e++] = b >>> 6 & 63 | 128;
else
continue;
d[e++] = b & 63 | 128;
}
}
return d.slice ? d.slice(0, e) : d.subarray(0, e);
};
Object.defineProperty(k.prototype, "encoding", { value: "utf-8" });
Object.defineProperty(k.prototype, "fatal", { value: false });
Object.defineProperty(k.prototype, "ignoreBOM", { value: false });
var p = q;
typeof Buffer === "function" && Buffer.from ? p = t : typeof Blob === "function" && typeof URL === "function" && typeof URL.createObjectURL === "function" && (p = u);
k.prototype.decode = function(a, c) {
c = c === void 0 ? { stream: false } : c;
if (c.stream)
throw Error("Failed to decode: the 'stream' option is unsupported.");
a = a instanceof Uint8Array ? a : a.buffer instanceof ArrayBuffer ? new Uint8Array(a.buffer) : new Uint8Array(a);
return p(a);
};
l.TextEncoder = m;
l.TextDecoder = k;
})(typeof window !== "undefined" ? window : typeof global !== "undefined" ? global : globalThis);
function wrap_instr(code) {
return function(args, exprs) {
return instr(code, args != null && !Array.isArray(args) ? [args] : args, exprs != null && !Array.isArray(exprs) ? [exprs] : exprs);
};
}
var encoding = {
"f64.const": f64,
"f32.const": f32
};
function* instr(code, args = [], exprs = []) {
for (let expr of exprs) {
switch (typeof expr) {
case "number":
yield expr;
break;
default:
yield* expr;
break;
}
}
yield* Array.isArray(BYTE[code]) ? BYTE[code] : [BYTE[code]];
for (let arg of args) {
switch (typeof arg) {
case "bigint":
yield* bigint(arg);
break;
case "number":
yield* (encoding[code] ?? int)(arg);
break;
default:
yield* arg;
}
}
}
var encoder = new TextEncoder("utf-8");
function utf8(s) {
return [...encoder.encode(s)];
}
function header() {
return [...utf8("\0asm"), 1, 0, 0, 0];
}
function section(type, data) {
return [BYTE.section[type], ...uint(data.length), ...data];
}
function vector(items) {
return [...uint(items.length), ...items.flat()];
}
function locals(items) {
const out = [];
let curr = [];
let prev;
for (const type of items) {
if (type !== prev && curr.length) {
out.push([...uint(curr.length), BYTE.type[curr[0]]]);
curr = [];
}
curr.push(type);
prev = type;
}
if (curr.length)
out.push([...uint(curr.length), BYTE.type[curr[0]]]);
return out;
}
function limits(min, max, shared) {
if (shared != null) {
return [BYTE.limits.shared, ...uint(min), ...uint(max)];
} else if (max != null) {
return [BYTE.limits.minmax, ...uint(min), ...uint(max)];
} else {
return [BYTE.limits.min, ...uint(min)];
}
}
section.type = function(types) {
return section("type", vector(types.map(([params, results]) => [
BYTE.type.func,
...vector(params.map((x) => BYTE.type[x])),
...vector(results.map((x) => BYTE.type[x]))
])));
};
section.import = function(imported) {
return section("import", vector(imported.map(([mod, field, type, desc]) => [
...vector(utf8(mod)),
...vector(utf8(field)),
BYTE.import[type],
...{
"func": () => desc.map((idx) => [...uint(idx)]),
"memory": () => limits(...desc)
}[type]()
])));
};
section.function = function(funcs) {
return section("function", vector(funcs.map((func) => [...uint(func)])));
};
section.table = function(tables) {
return section("table", vector(tables.map(([type, min, max]) => [BYTE.type[type], ...limits(min, max)])));
};
section.memory = function(memories) {
return section("memory", vector(memories.map(([min, max]) => limits(min, max))));
};
section.global = function(globals) {
return section("global", vector(globals.map(([mut, valtype, expr]) => [BYTE.type[valtype], BYTE.global[mut], ...expr, BYTE.end])));
};
section.export = function(exports) {
return section("export", vector(exports.map(([name, type, idx]) => [...vector(utf8(name)), BYTE.export[type], ...uint(idx)])));
};
section.start = function(func_idx) {
return section("start", [...uint(func_idx)]);
};
section.element = function(elements) {
return section("element", vector(elements.map(([table_idx, offset_idx_expr, funcs]) => [...uint(table_idx), ...offset_idx_expr, BYTE.end, ...vector(funcs)])));
};
section.code = function(funcs) {
return section("code", vector(funcs.map(([func_locals, func_body]) => vector([...vector(locals(func_locals)), ...func_body, BYTE.end]))));
};
section.data = function(data) {
return section("data", vector(data.map(([mem_idx, offset_idx_expr, bytes]) => [...uint(mem_idx), ...offset_idx_expr, BYTE.end, ...vector(bytes)])));
};
// lib/builder.js
var ByteArray = class extends Array {
log = [];
write(array, annotation) {
this.log.push(array, annotation);
this.push(...array);
return this;
}
get buffer() {
return new Uint8Array(this);
}
};
var ModuleBuilder = class {
types = [];
imports = [];
tables = [];
memories = [];
globals = [];
exports = [];
starts = "";
elements = [];
codes = [];
datas = [];
constructor(data) {
if (data)
Object.assign(this, data);
}
get funcs() {
return this.codes.filter((func) => !func.imported);
}
ensureType(params, results) {
const type_sig = [params.join(" "), results.join(" ")].join();
const idx = this.types.indexOf(type_sig);
if (idx >= 0)
return idx;
return this.types.push(type_sig) - 1;
}
getGlobalIndexOf(name) {
return this.globals.find((glob) => glob.name === name).idx;
}
getFunc(name) {
return this.codes.find((func) => func.name === name);
}
getMemory(name) {
console.log(name, this.memories);
return this.memories.find((mem) => mem.name === name);
}
getType(name) {
return this.types[name];
}
type(name, params, results) {
this.types[name] = this.ensureType(params, results);
return this;
}
import(type, name, mod, field, params, results) {
if (type === "func") {
const func = this._func(name, params, results, [], [], false, true);
this.imports.push({ mod, field, type, desc: [func.type_idx] });
} else if (type === "memory") {
this.imports.push({ mod, field, type, desc: params });
}
return this;
}
table(type, min, max) {
this.tables.push({ type, min, max });
return this;
}
memory(name, min, max) {
this.memories.push({ name, min, max });
return this;
}
global(name, mut, valtype, expr) {
const global_idx = this.globals.length;
this.globals.push({ idx: global_idx, name, valtype, mut, expr });
return this;
}
export(type, name, export_name) {
this.exports.push({ type, name, export_name });
return this;
}
start(name) {
this.starts = name;
return this;
}
elem(offset_idx_expr, codes) {
this.elements.push({ offset_idx_expr, codes });
return this;
}
_func(name, params = [], results = [], locals2 = [], body = [], exported = false, imported = false) {
const type_idx = this.ensureType(params, results);
const func_idx = this.codes.length;
const func = { idx: func_idx, name, type_idx, locals: locals2, body, imported };
this.codes.push(func);
if (exported) {
this.export("func", name, name);
}
return func;
}
func(...args) {
this._func(...args);
return this;
}
data(offset_idx_expr, bytes) {
this.datas.push({ offset_idx_expr, bytes });
return this;
}
build({ metrics = true } = {}) {
const bytes = new ByteArray();
bytes.write(header());
if (this.types.length) {
bytes.write(section.type(this.types.map((type) => type.split(",").map((x) => x.split(" ").filter(Boolean)))));
}
if (this.imports.length) {
bytes.write(section.import(this.imports.map((imp) => [imp.mod, imp.field, imp.type, imp.desc])));
}
if (this.funcs.length) {
bytes.write(section.function(this.funcs.map((func) => func.type_idx)));
}
if (this.elements.length) {
bytes.write(section.table(this.tables.map((table) => [table.type, table.min, table.max])));
}
if (this.memories.length) {
bytes.write(section.memory(this.memories.map((mem) => [mem.min, mem.max])));
}
if (this.globals.length) {
bytes.write(section.global(this.globals.map((glob) => [glob.mut, glob.valtype, glob.expr])));
}
if (this.exports.length) {
bytes.write(section.export(this.exports.map((exp) => exp.type === "func" ? [exp.export_name, exp.type, this.getFunc(exp.name).idx] : exp.type === "memory" ? [exp.export_name, exp.type, this.getMemory(exp.name).idx] : exp.type === "global" ? [exp.export_name, exp.type, this.getGlobalIndexOf(exp.name)] : [])));
}
if (this.starts.length) {
bytes.write(section.start(this.getFunc(this.starts).idx));
}
if (this.elements.length) {
bytes.write(section.element(this.elements.map((elem) => [
0,
elem.offset_idx_expr,
elem.codes.map((name) => this.getFunc(name).idx)
])));
}
if (this.funcs.length) {
bytes.write(section.code(this.funcs.map((func) => [func.locals, func.body])));
}
if (this.datas.length) {
bytes.write(section.data(this.datas.map((data) => [
0,
data.offset_idx_expr,
data.bytes
])));
}
return bytes;
}
};
// lib/compiler.js
var GlobalContext = class {
globals = [];
types = [];
funcs = [];
constructor(data) {
if (data) {
Object.assign(this, data);
this.funcs.forEach((x) => {
x.context = new FunctionContext(this, x.context);
});
}
}
lookup(name, instr2) {
let index;
switch (instr2) {
case "call":
{
index = this.funcs.map((x) => x.name).lastIndexOf(name);
}
break;
case "type":
{
index = this.types.map((x) => x.name).lastIndexOf(name);
}
break;
default: {
index = this.globals.map((x) => x.name).lastIndexOf(name);
}
}
if (!~index)
throw new ReferenceError(`lookup failed at: ${instr2} "${name}"`);
return uint(index);
}
};
var FunctionContext = class {
#global = null;
locals = [];
depth = [];
constructor(global2, data) {
this.#global = global2;
if (data)
Object.assign(this, data);
}
lookup(name, instr2) {
let index;
switch (instr2) {
case "br":
case "br_table":
case "br_if":
{
index = this.depth.lastIndexOf(name);
if (~index)
index = this.depth.length - 1 - index;
}
break;
default: {
index = this.locals.lastIndexOf(name);
}
}
if (!~index)
return this.#global.lookup(name, instr2);
return uint(index);
}
};
function compile(node, moduleData, globalData) {
const m = new ModuleBuilder(moduleData);
const g = new GlobalContext(globalData);
const deferred = [];
function cast(param, context = g, instr2 = "i32") {
switch (param.kind) {
case "number": {
if (param.value === "inf" || param.value === "+inf") {
return Infinity;
} else if (param.value === "-inf") {
return -Infinity;
} else if (param.value === "nan" || param.value === "+nan") {
return NaN;
} else if (param.value === "-nan") {
return NaN;
} else if (instr2?.[0] === "f") {
return parseFloat(param.value);
}
}
case "hex": {
let value;
if (instr2.indexOf("i64") === 0) {
if (param.value[0] === "-") {
value = -BigInt(param.value.slice(1));
} else {
value = BigInt(param.value);
}
return value;
} else if (instr2[0] === "f") {
if (param.value.indexOf("nan") >= 0) {
if (instr2.indexOf("f32") === 0) {
value = nanbox32(param.value);
} else {
value = nanbox64(param.value);
}
} else {
value = hex2float(param.value);
}
return value;
} else {
return parseInt(param.value);
}
}
case "label":
return context.lookup(param.value, instr2);
default:
return param.value;
}
}
function bytes(instr2, args, expr) {
if (!(instr2 in INSTR) || typeof INSTR[instr2] !== "function") {
throw new Error("Unknown instruction: " + instr2);
}
return [...INSTR[instr2](args, expr)];
}
function evaluate(node2, context = g) {
const address = { offset: 0, align: 0 };
const instr2 = node2.instr.value;
switch (instr2) {
case "type": {
return m.getType(node2.name.value);
}
case "call_indirect": {
const args = [evaluate(node2.children.shift(), context), 0];
const expr = node2.children.flatMap((x) => evaluate(x, context));
return bytes(instr2, args, expr);
}
case "memory.grow": {
const args = [0];
const expr = node2.children.flatMap((x) => evaluate(x, context));
return bytes(instr2, args, expr);
}
case "i32.load":
case "i64.load":
case "f32.load":
case "f64.load":
case "i32.load8_s":
case "i32.load8_u":
case "i32.load16_s":
case "i32.load16_u":
case "i64.load8_s":
case "i64.load8_u":
case "i64.load16_s":
case "i64.load16_u":
case "i64.load32_s":
case "i64.load32_u":
case "i32.store":
case "i64.store":
case "f32.store":
case "f64.store":
case "i32.store8":
case "i32.store16":
case "i64.store8":
case "i64.store16":
case "i64.store32": {
address.align = ALIGN[instr2];
for (const p of node2.params) {
address[p.param.value] = cast(p.value);
}
const args = [Math.log2(address.align), address.offset].map((x) => {
if (typeof x === "number")
return uint(x);
else if (typeof x === "bigint")
return bigint(x);
});
const expr = node2.children.flatMap((x) => evaluate(x, context));
return bytes(instr2, args, expr);
}
case "func": {
const func = {
name: node2.name?.value ?? g.funcs.length,
params: [],
results: []
};
g.funcs.push(func);
for (const c of node2.children) {
switch (c.instr.value) {
case "param":
{
func.params.push(...c.children.map((x) => x.instr.value));
}
break;
case "result":
{
func.results.push(...c.children.map((x) => x.instr.value));
}
break;
}
}