| // Copyright 2016 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. |
| |
| function WasmFunctionBuilder(name, sig_index) { |
| this.name = name; |
| this.sig_index = sig_index; |
| this.exports = []; |
| } |
| |
| WasmFunctionBuilder.prototype.exportAs = function(name) { |
| this.exports.push(name); |
| return this; |
| } |
| |
| WasmFunctionBuilder.prototype.exportFunc = function() { |
| this.exports.push(this.name); |
| return this; |
| } |
| |
| WasmFunctionBuilder.prototype.addBody = function(body) { |
| this.body = body; |
| return this; |
| } |
| |
| WasmFunctionBuilder.prototype.addLocals = function(locals) { |
| this.locals = locals; |
| return this; |
| } |
| |
| function WasmModuleBuilder() { |
| this.signatures = []; |
| this.imports = []; |
| this.functions = []; |
| this.exports = []; |
| this.function_table = []; |
| this.data_segments = []; |
| this.explicit = []; |
| return this; |
| } |
| |
| WasmModuleBuilder.prototype.addStart = function(start_index) { |
| this.start_index = start_index; |
| } |
| |
| WasmModuleBuilder.prototype.addMemory = function(min, max, exp) { |
| this.memory = {min: min, max: max, exp: exp}; |
| return this; |
| } |
| |
| WasmModuleBuilder.prototype.addExplicitSection = function(bytes) { |
| this.explicit.push(bytes); |
| return this; |
| } |
| |
| // Add a signature; format is [param_count, param0, param1, ..., retcount, ret0] |
| WasmModuleBuilder.prototype.addSignature = function(sig) { |
| // TODO: canonicalize signatures? |
| this.signatures.push(sig); |
| return this.signatures.length - 1; |
| } |
| |
| WasmModuleBuilder.prototype.addFunction = function(name, sig) { |
| var sig_index = (typeof sig) == "number" ? sig : this.addSignature(sig); |
| var func = new WasmFunctionBuilder(name, sig_index); |
| func.index = this.functions.length; |
| this.functions.push(func); |
| return func; |
| } |
| |
| WasmModuleBuilder.prototype.addImportWithModule = function(module, name, sig) { |
| var sig_index = (typeof sig) == "number" ? sig : this.addSignature(sig); |
| this.imports.push({module: module, name: name, sig_index: sig_index}); |
| return this.imports.length - 1; |
| } |
| |
| WasmModuleBuilder.prototype.addImport = function(name, sig) { |
| this.addImportWithModule(name, undefined, sig); |
| } |
| |
| WasmModuleBuilder.prototype.addDataSegment = function(addr, data, init) { |
| this.data_segments.push({addr: addr, data: data, init: init}); |
| return this.data_segments.length - 1; |
| } |
| |
| WasmModuleBuilder.prototype.appendToFunctionTable = function(array) { |
| this.function_table = this.function_table.concat(array); |
| return this; |
| } |
| |
| function emit_u8(bytes, val) { |
| bytes.push(val & 0xff); |
| } |
| |
| function emit_u16(bytes, val) { |
| bytes.push(val & 0xff); |
| bytes.push((val >> 8) & 0xff); |
| } |
| |
| function emit_u32(bytes, val) { |
| bytes.push(val & 0xff); |
| bytes.push((val >> 8) & 0xff); |
| bytes.push((val >> 16) & 0xff); |
| bytes.push((val >> 24) & 0xff); |
| } |
| |
| function emit_string(bytes, string) { |
| // When testing illegal names, we pass a byte array directly. |
| if (string instanceof Array) { |
| emit_varint(bytes, string.length); |
| emit_bytes(bytes, string); |
| return; |
| } |
| |
| // This is the hacky way to convert a JavaScript scring to a UTF8 encoded |
| // string only containing single-byte characters. |
| var string_utf8 = unescape(encodeURIComponent(string)); |
| emit_varint(bytes, string_utf8.length); |
| for (var i = 0; i < string_utf8.length; i++) { |
| emit_u8(bytes, string_utf8.charCodeAt(i)); |
| } |
| } |
| |
| function emit_varint(bytes, val) { |
| while (true) { |
| var v = val & 0xff; |
| val = val >>> 7; |
| if (val == 0) { |
| bytes.push(v); |
| break; |
| } |
| bytes.push(v | 0x80); |
| } |
| } |
| |
| function emit_bytes(bytes, data) { |
| for (var i = 0; i < data.length; i++) { |
| bytes.push(data[i] & 0xff); |
| } |
| } |
| |
| function emit_section(bytes, section_code, content_generator) { |
| // Emit section name. |
| emit_string(bytes, section_names[section_code]); |
| // Emit the section to a temporary buffer: its full length isn't know yet. |
| var tmp_bytes = []; |
| content_generator(tmp_bytes); |
| // Emit section length. |
| emit_varint(bytes, tmp_bytes.length); |
| // Copy the temporary buffer. |
| Array.prototype.push.apply(bytes, tmp_bytes); |
| } |
| |
| WasmModuleBuilder.prototype.toArray = function(debug) { |
| // Add header bytes |
| var bytes = []; |
| bytes = bytes.concat([kWasmH0, kWasmH1, kWasmH2, kWasmH3, |
| kWasmV0, kWasmV1, kWasmV2, kWasmV3]); |
| |
| var wasm = this; |
| |
| // Add signatures section |
| if (wasm.signatures.length > 0) { |
| if (debug) print("emitting signatures @ " + bytes.length); |
| emit_section(bytes, kDeclSignatures, function(bytes) { |
| emit_varint(bytes, wasm.signatures.length); |
| for (sig of wasm.signatures) { |
| emit_u8(bytes, kWasmFunctionTypeForm); |
| for (var j = 0; j < sig.length; j++) { |
| emit_u8(bytes, sig[j]); |
| } |
| } |
| }); |
| } |
| |
| // Add imports section |
| if (wasm.imports.length > 0) { |
| if (debug) print("emitting imports @ " + bytes.length); |
| emit_section(bytes, kDeclImportTable, function(bytes) { |
| emit_varint(bytes, wasm.imports.length); |
| for (imp of wasm.imports) { |
| emit_varint(bytes, imp.sig_index); |
| emit_string(bytes, imp.module); |
| emit_string(bytes, imp.name || ''); |
| } |
| }); |
| } |
| |
| // Add functions declarations |
| var names = false; |
| var exports = 0; |
| if (wasm.functions.length > 0) { |
| var has_names = false; |
| |
| // emit function signatures |
| if (debug) print("emitting function sigs @ " + bytes.length); |
| emit_section(bytes, kDeclFunctionSignatures, function(bytes) { |
| emit_varint(bytes, wasm.functions.length); |
| for (func of wasm.functions) { |
| has_names = has_names || (func.name != undefined && |
| func.name.length > 0); |
| exports += func.exports.length; |
| |
| emit_varint(bytes, func.sig_index); |
| } |
| }); |
| |
| } |
| |
| // Add function table. |
| if (wasm.function_table.length > 0) { |
| if (debug) print("emitting function table @ " + bytes.length); |
| emit_section(bytes, kDeclFunctionTable, function(bytes) { |
| emit_varint(bytes, wasm.function_table.length); |
| for (index of wasm.function_table) { |
| emit_varint(bytes, index); |
| } |
| }); |
| } |
| |
| // Add memory section |
| if (wasm.memory != undefined) { |
| if (debug) print("emitting memory @ " + bytes.length); |
| emit_section(bytes, kDeclMemory, function(bytes) { |
| emit_varint(bytes, wasm.memory.min); |
| emit_varint(bytes, wasm.memory.max); |
| emit_u8(bytes, wasm.memory.exp ? 1 : 0); |
| }); |
| } |
| |
| |
| // Add export table. |
| if (exports > 0) { |
| if (debug) print("emitting exports @ " + bytes.length); |
| emit_section(bytes, kDeclExportTable, function(bytes) { |
| emit_varint(bytes, exports); |
| for (func of wasm.functions) { |
| for (exp of func.exports) { |
| emit_varint(bytes, func.index); |
| emit_string(bytes, exp); |
| } |
| } |
| }); |
| } |
| |
| // Add start function section. |
| if (wasm.start_index != undefined) { |
| if (debug) print("emitting start function @ " + bytes.length); |
| emit_section(bytes, kDeclStartFunction, function(bytes) { |
| emit_varint(bytes, wasm.start_index); |
| }); |
| } |
| |
| // Add function bodies. |
| if (wasm.functions.length > 0) { |
| // emit function bodies |
| if (debug) print("emitting function bodies @ " + bytes.length); |
| emit_section(bytes, kDeclFunctionBodies, function(bytes) { |
| emit_varint(bytes, wasm.functions.length); |
| for (func of wasm.functions) { |
| // Function body length will be patched later. |
| var local_decls = []; |
| var l = func.locals; |
| if (l != undefined) { |
| var local_decls_count = 0; |
| if (l.i32_count > 0) { |
| local_decls.push({count: l.i32_count, type: kAstI32}); |
| } |
| if (l.i64_count > 0) { |
| local_decls.push({count: l.i64_count, type: kAstI64}); |
| } |
| if (l.f32_count > 0) { |
| local_decls.push({count: l.f32_count, type: kAstF32}); |
| } |
| if (l.f64_count > 0) { |
| local_decls.push({count: l.f64_count, type: kAstF64}); |
| } |
| } |
| var header = new Array(); |
| |
| emit_varint(header, local_decls.length); |
| for (decl of local_decls) { |
| emit_varint(header, decl.count); |
| emit_u8(header, decl.type); |
| } |
| |
| emit_varint(bytes, header.length + func.body.length); |
| emit_bytes(bytes, header); |
| emit_bytes(bytes, func.body); |
| } |
| }); |
| } |
| |
| // Add data segments. |
| if (wasm.data_segments.length > 0) { |
| if (debug) print("emitting data segments @ " + bytes.length); |
| emit_section(bytes, kDeclDataSegments, function(bytes) { |
| emit_varint(bytes, wasm.data_segments.length); |
| for (seg of wasm.data_segments) { |
| emit_varint(bytes, seg.addr); |
| emit_varint(bytes, seg.data.length); |
| emit_bytes(bytes, seg.data); |
| } |
| }); |
| } |
| |
| // Add any explicitly added sections |
| for (exp of wasm.explicit) { |
| if (debug) print("emitting explicit @ " + bytes.length); |
| emit_bytes(bytes, exp); |
| } |
| |
| // Add function names. |
| if (has_names) { |
| if (debug) print("emitting names @ " + bytes.length); |
| emit_section(bytes, kDeclNames, function(bytes) { |
| emit_varint(bytes, wasm.functions.length); |
| for (func of wasm.functions) { |
| var name = func.name == undefined ? "" : func.name; |
| emit_string(bytes, name); |
| emit_u8(bytes, 0); // local names count == 0 |
| } |
| }); |
| } |
| |
| // End the module. |
| if (debug) print("emitting end @ " + bytes.length); |
| emit_section(bytes, kDeclEnd, function(bytes) {}); |
| |
| return bytes; |
| } |
| |
| WasmModuleBuilder.prototype.toBuffer = function(debug) { |
| var bytes = this.toArray(debug); |
| var buffer = new ArrayBuffer(bytes.length); |
| var view = new Uint8Array(buffer); |
| for (var i = 0; i < bytes.length; i++) { |
| var val = bytes[i]; |
| if ((typeof val) == "string") val = val.charCodeAt(0); |
| view[i] = val | 0; |
| } |
| return buffer; |
| } |
| |
| WasmModuleBuilder.prototype.instantiate = function(ffi, memory) { |
| var buffer = this.toBuffer(); |
| if (memory != undefined) { |
| return Wasm.instantiateModule(buffer, ffi, memory); |
| } else { |
| return Wasm.instantiateModule(buffer, ffi); |
| } |
| } |