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Refs: v8/v8@12.9.202.26...12.9.202.28 PR-URL: #55371 Reviewed-By: Michaël Zasso <[email protected]> Reviewed-By: Luigi Pinca <[email protected]> Reviewed-By: Rafael Gonzaga <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,221 @@ | ||
| // Copyright 2024 the V8 project authors. All rights reserved. | ||
| // Use of this source code is governed by a BSD-style license that can be | ||
| // found in the LICENSE file. | ||
| // | ||
| // Flags: --allow-natives-syntax | ||
|
|
||
| var kWasmH0 = 0; | ||
| var kWasmH1 = 0x61; | ||
| var kWasmH2 = 0x73; | ||
| var kWasmH3 = 0x6d; | ||
| var kWasmV0 = 0x1; | ||
| var kWasmV1 = 0; | ||
| var kWasmV2 = 0; | ||
| var kWasmV3 = 0; | ||
| let kTypeSectionCode = 1; // Function signature declarations | ||
| let kFunctionSectionCode = 3; // Function declarations | ||
| let kExportSectionCode = 7; // Exports | ||
| let kCodeSectionCode = 10; // Function code | ||
| let kWasmFunctionTypeForm = 0x60; | ||
| let kWasmStructTypeForm = 0x5f; | ||
| let kNoSuperType = 0xFFFFFFFF; | ||
| let kWasmI32 = 0x7f; | ||
| let kWasmExternRef = -0x11; | ||
| let kLeb128Mask = 0x7f; | ||
| let kExternalFunction = 0; | ||
| function makeSig(params, results) { | ||
| return {params: params, results: results}; | ||
| } | ||
| const kWasmOpcodes = { | ||
| 'End': 0x0b, | ||
| 'I32Const': 0x41, | ||
| }; | ||
| function defineWasmOpcode(name, value) { | ||
| Object.defineProperty(globalThis, name, {value: value}); | ||
| } | ||
| for (let name in kWasmOpcodes) { | ||
| defineWasmOpcode(`kExpr${name}`, kWasmOpcodes[name]); | ||
| } | ||
| const kPrefixOpcodes = { | ||
| 'GC': 0xfb, | ||
| }; | ||
| for (let prefix in kPrefixOpcodes) { | ||
| defineWasmOpcode(`k${prefix}Prefix`, kPrefixOpcodes[prefix]); | ||
| } | ||
| let kExprStructNew = 0x00; | ||
| let kExprExternConvertAny = 0x1b; | ||
| class Binary { | ||
| constructor() { | ||
| this.length = 0; | ||
| this.buffer = new Uint8Array(8192); | ||
| } | ||
| trunc_buffer() { | ||
| return new Uint8Array(this.buffer.buffer, 0, this.length); | ||
| } | ||
| emit_u8(val) { | ||
| this.buffer[this.length++] = val; | ||
| } | ||
| emit_leb_u(val) { | ||
| let v = val & 0xff; | ||
| this.buffer[this.length++] = v; | ||
| } | ||
| emit_u32v(val) { | ||
| this.emit_leb_u(val); | ||
| } | ||
| emit_bytes(data) { | ||
| this.buffer.set(data, this.length); | ||
| this.length += data.length; | ||
| } | ||
| emit_string(string) { | ||
| let string_utf8 = string; | ||
| this.emit_u32v(string_utf8.length); | ||
| for (let i = 0; i < string_utf8.length; i++) { | ||
| this.emit_u8(string_utf8.charCodeAt(i)); | ||
| } | ||
| } | ||
| emit_type(type) { | ||
| this.emit_u8(type >= 0 ? type : type & kLeb128Mask); | ||
| } | ||
| emit_header() { | ||
| this.emit_bytes([ | ||
| kWasmH0, kWasmH1, kWasmH2, kWasmH3, kWasmV0, kWasmV1, kWasmV2, kWasmV3 | ||
| ]); | ||
| } | ||
| emit_section(section_code, content_generator) { | ||
| this.emit_u8(section_code); | ||
| const section = new Binary; | ||
| content_generator(section); | ||
| this.emit_u32v(section.length); | ||
| this.emit_bytes(section.trunc_buffer()); | ||
| } | ||
| } | ||
| class WasmFunctionBuilder { | ||
| constructor(module, name, type_index, arg_names) { | ||
| this.module = module; | ||
| this.name = name; | ||
| this.type_index = type_index; | ||
| } | ||
| exportAs(name) { | ||
| this.module.addExport(name, this.index); | ||
| } | ||
| exportFunc() { | ||
| this.exportAs(this.name); | ||
| return this; | ||
| } | ||
| addBody(body) { | ||
| this.body = body.concat([kExprEnd]); | ||
| } | ||
| } | ||
| function makeField(type, mutability) { | ||
| return {type: type, mutability: mutability}; | ||
| } | ||
| class WasmStruct { | ||
| constructor(fields) { | ||
| this.fields = fields; | ||
| } | ||
| } | ||
| class WasmModuleBuilder { | ||
| constructor() { | ||
| this.types = []; | ||
| this.exports = []; | ||
| this.functions = []; | ||
| } | ||
| addType(type, supertype_idx = kNoSuperType, is_final = true, | ||
| is_shared = false) { | ||
| var type_copy = {params: type.params, results: type.results, | ||
| is_final: is_final, is_shared: is_shared, | ||
| supertype: supertype_idx}; | ||
| this.types.push(type_copy); | ||
| return this.types.length - 1; | ||
| } | ||
| addStruct(fields = kNoSuperType = false, is_shared = false) { | ||
| this.types.push(new WasmStruct(fields)); | ||
| } | ||
| addFunction(name, type, arg_names) { | ||
| let type_index =typeof type == 'number' ? type : this.addType(type); | ||
| let func = new WasmFunctionBuilder(this, name, type_index); | ||
| this.functions.push(func); | ||
| return func; | ||
| } | ||
| addExport(name, index) { | ||
| this.exports.push({name: name, kind: kExternalFunction, index: index}); | ||
| } | ||
| toBuffer() { | ||
| let binary = new Binary; | ||
| let wasm = this; | ||
| binary.emit_header(); | ||
| binary.emit_section(kTypeSectionCode, section => { | ||
| let length_with_groups = wasm.types.length; | ||
| section.emit_u32v(length_with_groups); | ||
| for (let i = 0; i < wasm.types.length; i++) { | ||
| let type = wasm.types[i]; | ||
| if (type instanceof WasmStruct) { | ||
| section.emit_u8(kWasmStructTypeForm); | ||
| section.emit_u32v(type.fields.length); | ||
| for (let field of type.fields) { | ||
| section.emit_type(field.type); | ||
| section.emit_u8(); | ||
| } | ||
| } else { | ||
| section.emit_u8(kWasmFunctionTypeForm); | ||
| section.emit_u32v(); | ||
| section.emit_u32v(type.results.length); | ||
| for (let result of type.results) { | ||
| section.emit_type(result); | ||
| } | ||
| } | ||
| } | ||
| }); | ||
| binary.emit_section(kFunctionSectionCode, section => { | ||
| section.emit_u32v(wasm.functions.length); | ||
| for (let func of wasm.functions) { | ||
| section.emit_u32v(func.type_index); | ||
| } | ||
| }); | ||
| var exports_count = wasm.exports.length; | ||
| binary.emit_section(kExportSectionCode, section => { | ||
| section.emit_u32v(exports_count); | ||
| for (let exp of wasm.exports) { | ||
| section.emit_string(exp.name); | ||
| section.emit_u8(); | ||
| section.emit_u32v(); | ||
| } | ||
| }); | ||
| binary.emit_section(kCodeSectionCode, section => { | ||
| section.emit_u32v(wasm.functions.length); | ||
| for (let func of wasm.functions) { | ||
| section.emit_u32v(func.body.length + 1); | ||
| section.emit_u8(); // 0 locals. | ||
| section.emit_bytes(func.body); | ||
| } | ||
| }); | ||
| return binary.trunc_buffer(); | ||
| } | ||
| instantiate() { | ||
| let module = this.toModule(); | ||
| let instance = new WebAssembly.Instance(module); | ||
| return instance; | ||
| } | ||
| toModule() { | ||
| return new WebAssembly.Module(this.toBuffer()); | ||
| } | ||
| } | ||
| let builder = new WasmModuleBuilder(); | ||
| let struct_type = builder.addStruct([makeField(kWasmI32)]); | ||
| builder.addFunction('MakeStruct', makeSig([], [kWasmExternRef])).exportFunc() | ||
| .addBody([kExprI32Const, 42, kGCPrefix, kExprStructNew, struct_type, | ||
| kGCPrefix, kExprExternConvertAny]); | ||
| let instance = builder.instantiate(); | ||
| let evil_wasm_object = instance.exports.MakeStruct(); | ||
| function evil_ctor(){ | ||
| } | ||
| function evil_cast_jit(evil_o){ | ||
| global_collect_node_info = evil_o; // get nodeinfo from PropertyCellStore | ||
| return evil_o instanceof evil_ctor; | ||
| } | ||
| evil_ctor.prototype = evil_wasm_object; | ||
| %PrepareFunctionForOptimization(evil_cast_jit); | ||
| evil_cast_jit(new evil_ctor()); | ||
| evil_cast_jit(new evil_ctor()); | ||
| %OptimizeFunctionOnNextCall(evil_cast_jit); | ||
| evil_cast_jit(); |