diff options
Diffstat (limited to 'deps/v8/test/mjsunit/wasm/wasm-module-builder.js')
| -rw-r--r-- | deps/v8/test/mjsunit/wasm/wasm-module-builder.js | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/deps/v8/test/mjsunit/wasm/wasm-module-builder.js b/deps/v8/test/mjsunit/wasm/wasm-module-builder.js new file mode 100644 index 0000000000..e1d996338c --- /dev/null +++ b/deps/v8/test/mjsunit/wasm/wasm-module-builder.js @@ -0,0 +1,335 @@ +// 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 [rettype, param0, param1, ...] +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) { + var sig_index = (typeof sig) == "number" ? sig : this.addSignature(sig); + this.imports.push({module: name, name: undefined, sig_index: sig_index}); + return this.imports.length - 1; +} + +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) { + emit_varint(bytes, string.length); + for (var i = 0; i < string.length; i++) { + emit_u8(bytes, string.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) { + // Start the section in a temporary buffer: its full length isn't know yet. + var tmp_bytes = []; + emit_string(tmp_bytes, section_names[section_code]); + content_generator(tmp_bytes); + // Now that we know the section length, emit it and copy the section. + emit_varint(bytes, tmp_bytes.length); + 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 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 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) { + var params = sig.length - 1; + emit_varint(bytes, params); + 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 section + 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); + } + }); + + // 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); + } + }); + } + + // emit 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 + } + }); + } + + // 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); + }); + } + + 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); + } + }); + } + + 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); + } + } + }); + } + + 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); + } + }); + } + + // Emit any explicitly added sections + for (exp of wasm.explicit) { + if (debug) print("emitting explicit @ " + bytes.length); + emit_bytes(bytes, exp); + } + + // 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); + } +} |