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301 lines (287 loc) 路 6.15 KB
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/**
* Binary format utilities.
* @module binary
*//***/
// TBD: Moving lib/parse here might make sense where the compiler has to evaluate WASM binaries on
// the fly, like when importing other WASM files through `import`. Module integration hasn't been
// specified, yet, though, and it somewhat conflicts with our dependency on Binaryen.
/** WebAssembly section ids. */
export enum SectionId {
/** A custom section with an explicit name. */
Custom = 0,
/** Function types section. */
Type = 1,
/** Imports section. */
Import = 2,
/** Functions section. */
Function = 3,
/** Tables section. */
Table = 4,
/** Memories section. */
Memory = 5,
/** Globals section. */
Global = 6,
/** Exports section. */
Export = 7,
/** Start function section. */
Start = 8,
/** Table element section. */
Element = 9,
/** Function code section. */
Code = 10,
/** Memory segments section. */
Data = 11
}
/** WebAssembly external kinds. */
export enum ExternalKind {
/** External function. */
Function = 0,
/** External table. */
Table = 1,
/** External memory. */
Memory = 2,
/** External global. */
Global = 3
}
/** WebAssembly name section kinds. */
export enum NameKind {
/** Module name. */
Module = 0,
/** Function name. */
Function = 1,
/** Local name. */
Local = 2,
// see: https://github.com/WebAssembly/design/pull/1064
/** Label name. */
Label = 3,
/** Function type name. */
Type = 4,
/** Table name. */
Table = 5,
/** Memory name. */
Memory = 6,
/** Global variable name. */
Global = 7
}
/** WebAssembly types. */
export enum Type {
i32 = 0x7f,
i64 = 0x7e,
f32 = 0x7d,
f64 = 0x7c,
anyfunc = 0x70,
func = 0x60,
none = 0x40
}
/** WebAssembly opcodes. */
export enum Op {
unreachable = 0x00,
nop = 0x01,
block = 0x02,
loop = 0x03,
if_ = 0x04,
else_ = 0x05,
end = 0x0b,
br = 0x0c,
br_if = 0x0d,
br_table = 0x0e,
return_ = 0x0f,
call = 0x10,
call_indirect = 0x11,
drop = 0x1a,
select = 0x1b,
get_local = 0x20,
set_local = 0x21,
tee_local = 0x22,
get_global = 0x23,
set_global = 0x24,
i32_load = 0x28,
i64_load = 0x29,
f32_load = 0x2a,
f64_load = 0x2b,
i32_load8_s = 0x2c,
i32_load8_u = 0x2d,
i32_load16_s = 0x2e,
i32_load16_u = 0x2f,
i64_load8_s = 0x30,
i64_load8_u = 0x31,
i64_load16_s = 0x32,
i64_load16_u = 0x33,
i64_load32_s = 0x34,
i64_load32_u = 0x35,
i32_store = 0x36,
i64_store = 0x37,
f32_store = 0x38,
f64_store = 0x39,
i32_store8 = 0x3a,
i32_store16 = 0x3b,
i64_store8 = 0x3c,
i64_store16 = 0x3d,
i64_store32 = 0x3e,
memory_size = 0x3f,
memory_grow = 0x40,
i32_const = 0x41,
i64_const = 0x42,
f32_const = 0x43,
f64_const = 0x44,
i32_eqz = 0x45,
i32_eq = 0x46,
i32_ne = 0x47,
i32_lt_s = 0x48,
i32_lt_u = 0x49,
i32_gt_s = 0x4a,
i32_gt_u = 0x4b,
i32_le_s = 0x4c,
i32_le_u = 0x4d,
i32_ge_s = 0x4e,
i32_ge_u = 0x4f,
i64_eqz = 0x50,
i64_eq = 0x51,
i64_ne = 0x52,
i64_lt_s = 0x53,
i64_lt_u = 0x54,
i64_gt_s = 0x55,
i64_gt_u = 0x56,
i64_le_s = 0x57,
i64_le_u = 0x58,
i64_ge_s = 0x59,
i64_ge_u = 0x5a,
f32_eq = 0x5b,
f32_ne = 0x5c,
f32_lt = 0x5d,
f32_gt = 0x5e,
f32_le = 0x5f,
f32_ge = 0x60,
f64_eq = 0x61,
f64_ne = 0x62,
f64_lt = 0x63,
f64_gt = 0x64,
f64_le = 0x65,
f64_ge = 0x66,
i32_clz = 0x67,
i32_ctz = 0x68,
i32_popcnt = 0x69,
i32_add = 0x6a,
i32_sub = 0x6b,
i32_mul = 0x6c,
i32_div_s = 0x6d,
i32_div_u = 0x6e,
i32_rem_s = 0x6f,
i32_rem_u = 0x70,
i32_and = 0x71,
i32_or = 0x72,
i32_xor = 0x73,
i32_shl = 0x74,
i32_shr_s = 0x75,
i32_shr_u = 0x76,
i32_rotl = 0x77,
i32_rotr = 0x78,
i64_clz = 0x79,
i64_ctz = 0x7a,
i64_popcnt = 0x7b,
i64_add = 0x7c,
i64_sub = 0x7d,
i64_mul = 0x7e,
i64_div_s = 0x7f,
i64_div_u = 0x80,
i64_rem_s = 0x81,
i64_rem_u = 0x82,
i64_and = 0x83,
i64_or = 0x84,
i64_xor = 0x85,
i64_shl = 0x86,
i64_shr_s = 0x87,
i64_shr_u = 0x88,
i64_rotl = 0x89,
i64_rotr = 0x8a,
f32_abs = 0x8b,
f32_neg = 0x8c,
f32_ceil = 0x8d,
f32_floor = 0x8e,
f32_trunc = 0x8f,
f32_nearest = 0x90,
f32_sqrt = 0x91,
f32_add = 0x92,
f32_sub = 0x93,
f32_mul = 0x94,
f32_div = 0x95,
f32_min = 0x96,
f32_max = 0x97,
f32_copysign = 0x98,
f64_abs = 0x99,
f64_neg = 0x9a,
f64_ceil = 0x9b,
f64_floor = 0x9c,
f64_trunc = 0x9d,
f64_nearest = 0x9e,
f64_sqrt = 0x9f,
f64_add = 0xa0,
f64_sub = 0xa1,
f64_mul = 0xa2,
f64_div = 0xa3,
f64_min = 0xa4,
f64_max = 0xa5,
f64_copysign = 0xa6,
i32_wrap_i64 = 0xa7,
i32_trunc_s_f32 = 0xa8,
i32_trunc_u_f32 = 0xa9,
i32_trunc_s_f64 = 0xaa,
i32_trunc_u_f64 = 0xab,
i64_extend_s_i32 = 0xac,
i64_extend_u_i32 = 0xad,
i64_trunc_s_f32 = 0xae,
i64_trunc_u_f32 = 0xaf,
i64_trunc_s_f64 = 0xb0,
i64_trunc_u_f64 = 0xb1,
f32_convert_s_i32 = 0xb2,
f32_convert_u_i32 = 0xb3,
f32_convert_s_i64 = 0xb4,
f32_convert_u_i64 = 0xb5,
f32_demote_f64 = 0xb6,
f64_convert_s_i32 = 0xb7,
f64_convert_u_i32 = 0xb8,
f64_convert_s_i64 = 0xb9,
f64_convert_u_i64 = 0xba,
f64_promote_f32 = 0xbb,
i32_reinterpret_f32 = 0xbc,
i64_reinterpret_f64 = 0xbd,
f32_reinterpret_i32 = 0xbe,
f64_reinterpret_i64 = 0xbf
}
enum ReaderState {
HEADER
}
/** WebAssembly binary reader. */
export class Reader { // TODO
/** Buffer being read. */
private buffer: Uint8Array;
/** Current read offset. */
private offset: u32;
/** Total length. */
private length: u32;
/** Current state. */
private state: ReaderState;
/** Constructs a new binary reader. */
constructor(totalLength: u32, initialChunk: Uint8Array) {
this.buffer = initialChunk;
this.offset = 0;
this.length = totalLength;
this.state = ReaderState.HEADER;
}
/** Provides a chunk of data. */
next(chunk: Uint8Array): void {
if (!chunk.length) return;
// var current = this.buffer;
// var offset = this.offset;
// var buffer = new Uint8Array((current.length - offset) + chunk.length);
// buffer.set(current.subarray(offset), 0);
// buffer.set(chunk, (current.length - offset));
// this.buffer = buffer;
// this.length -= this.offset;
// this.offset = 0;
unreachable();
}
finish(): void {
unreachable();
}
}