Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 1 | // Copyright 2016 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | function WasmFunctionBuilder(name, sig_index) { |
| 6 | this.name = name; |
| 7 | this.sig_index = sig_index; |
| 8 | this.exports = []; |
| 9 | } |
| 10 | |
| 11 | WasmFunctionBuilder.prototype.exportAs = function(name) { |
| 12 | this.exports.push(name); |
| 13 | return this; |
| 14 | } |
| 15 | |
| 16 | WasmFunctionBuilder.prototype.exportFunc = function() { |
| 17 | this.exports.push(this.name); |
| 18 | return this; |
| 19 | } |
| 20 | |
| 21 | WasmFunctionBuilder.prototype.addBody = function(body) { |
| 22 | this.body = body; |
| 23 | return this; |
| 24 | } |
| 25 | |
| 26 | WasmFunctionBuilder.prototype.addLocals = function(locals) { |
| 27 | this.locals = locals; |
| 28 | return this; |
| 29 | } |
| 30 | |
| 31 | function WasmModuleBuilder() { |
| 32 | this.signatures = []; |
| 33 | this.imports = []; |
| 34 | this.functions = []; |
| 35 | this.exports = []; |
| 36 | this.function_table = []; |
| 37 | this.data_segments = []; |
| 38 | this.explicit = []; |
| 39 | return this; |
| 40 | } |
| 41 | |
| 42 | WasmModuleBuilder.prototype.addStart = function(start_index) { |
| 43 | this.start_index = start_index; |
| 44 | } |
| 45 | |
| 46 | WasmModuleBuilder.prototype.addMemory = function(min, max, exp) { |
| 47 | this.memory = {min: min, max: max, exp: exp}; |
| 48 | return this; |
| 49 | } |
| 50 | |
| 51 | WasmModuleBuilder.prototype.addExplicitSection = function(bytes) { |
| 52 | this.explicit.push(bytes); |
| 53 | return this; |
| 54 | } |
| 55 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 56 | // Add a signature; format is [param_count, param0, param1, ..., retcount, ret0] |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 57 | WasmModuleBuilder.prototype.addSignature = function(sig) { |
| 58 | // TODO: canonicalize signatures? |
| 59 | this.signatures.push(sig); |
| 60 | return this.signatures.length - 1; |
| 61 | } |
| 62 | |
| 63 | WasmModuleBuilder.prototype.addFunction = function(name, sig) { |
| 64 | var sig_index = (typeof sig) == "number" ? sig : this.addSignature(sig); |
| 65 | var func = new WasmFunctionBuilder(name, sig_index); |
| 66 | func.index = this.functions.length; |
| 67 | this.functions.push(func); |
| 68 | return func; |
| 69 | } |
| 70 | |
| 71 | WasmModuleBuilder.prototype.addImportWithModule = function(module, name, sig) { |
| 72 | var sig_index = (typeof sig) == "number" ? sig : this.addSignature(sig); |
| 73 | this.imports.push({module: module, name: name, sig_index: sig_index}); |
| 74 | return this.imports.length - 1; |
| 75 | } |
| 76 | |
| 77 | WasmModuleBuilder.prototype.addImport = function(name, sig) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 78 | this.addImportWithModule(name, undefined, sig); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 79 | } |
| 80 | |
| 81 | WasmModuleBuilder.prototype.addDataSegment = function(addr, data, init) { |
| 82 | this.data_segments.push({addr: addr, data: data, init: init}); |
| 83 | return this.data_segments.length - 1; |
| 84 | } |
| 85 | |
| 86 | WasmModuleBuilder.prototype.appendToFunctionTable = function(array) { |
| 87 | this.function_table = this.function_table.concat(array); |
| 88 | return this; |
| 89 | } |
| 90 | |
| 91 | function emit_u8(bytes, val) { |
| 92 | bytes.push(val & 0xff); |
| 93 | } |
| 94 | |
| 95 | function emit_u16(bytes, val) { |
| 96 | bytes.push(val & 0xff); |
| 97 | bytes.push((val >> 8) & 0xff); |
| 98 | } |
| 99 | |
| 100 | function emit_u32(bytes, val) { |
| 101 | bytes.push(val & 0xff); |
| 102 | bytes.push((val >> 8) & 0xff); |
| 103 | bytes.push((val >> 16) & 0xff); |
| 104 | bytes.push((val >> 24) & 0xff); |
| 105 | } |
| 106 | |
| 107 | function emit_string(bytes, string) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 108 | // When testing illegal names, we pass a byte array directly. |
| 109 | if (string instanceof Array) { |
| 110 | emit_varint(bytes, string.length); |
| 111 | emit_bytes(bytes, string); |
| 112 | return; |
| 113 | } |
| 114 | |
| 115 | // This is the hacky way to convert a JavaScript scring to a UTF8 encoded |
| 116 | // string only containing single-byte characters. |
| 117 | var string_utf8 = unescape(encodeURIComponent(string)); |
| 118 | emit_varint(bytes, string_utf8.length); |
| 119 | for (var i = 0; i < string_utf8.length; i++) { |
| 120 | emit_u8(bytes, string_utf8.charCodeAt(i)); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 121 | } |
| 122 | } |
| 123 | |
| 124 | function emit_varint(bytes, val) { |
| 125 | while (true) { |
| 126 | var v = val & 0xff; |
| 127 | val = val >>> 7; |
| 128 | if (val == 0) { |
| 129 | bytes.push(v); |
| 130 | break; |
| 131 | } |
| 132 | bytes.push(v | 0x80); |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | function emit_bytes(bytes, data) { |
| 137 | for (var i = 0; i < data.length; i++) { |
| 138 | bytes.push(data[i] & 0xff); |
| 139 | } |
| 140 | } |
| 141 | |
| 142 | function emit_section(bytes, section_code, content_generator) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 143 | // Emit section name. |
| 144 | emit_string(bytes, section_names[section_code]); |
| 145 | // Emit the section to a temporary buffer: its full length isn't know yet. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 146 | var tmp_bytes = []; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 147 | content_generator(tmp_bytes); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 148 | // Emit section length. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 149 | emit_varint(bytes, tmp_bytes.length); |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 150 | // Copy the temporary buffer. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 151 | Array.prototype.push.apply(bytes, tmp_bytes); |
| 152 | } |
| 153 | |
| 154 | WasmModuleBuilder.prototype.toArray = function(debug) { |
| 155 | // Add header bytes |
| 156 | var bytes = []; |
| 157 | bytes = bytes.concat([kWasmH0, kWasmH1, kWasmH2, kWasmH3, |
| 158 | kWasmV0, kWasmV1, kWasmV2, kWasmV3]); |
| 159 | |
| 160 | var wasm = this; |
| 161 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 162 | // Add signatures section |
| 163 | if (wasm.signatures.length > 0) { |
| 164 | if (debug) print("emitting signatures @ " + bytes.length); |
| 165 | emit_section(bytes, kDeclSignatures, function(bytes) { |
| 166 | emit_varint(bytes, wasm.signatures.length); |
| 167 | for (sig of wasm.signatures) { |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 168 | emit_u8(bytes, kWasmFunctionTypeForm); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 169 | for (var j = 0; j < sig.length; j++) { |
| 170 | emit_u8(bytes, sig[j]); |
| 171 | } |
| 172 | } |
| 173 | }); |
| 174 | } |
| 175 | |
| 176 | // Add imports section |
| 177 | if (wasm.imports.length > 0) { |
| 178 | if (debug) print("emitting imports @ " + bytes.length); |
| 179 | emit_section(bytes, kDeclImportTable, function(bytes) { |
| 180 | emit_varint(bytes, wasm.imports.length); |
| 181 | for (imp of wasm.imports) { |
| 182 | emit_varint(bytes, imp.sig_index); |
| 183 | emit_string(bytes, imp.module); |
| 184 | emit_string(bytes, imp.name || ''); |
| 185 | } |
| 186 | }); |
| 187 | } |
| 188 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 189 | // Add functions declarations |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 190 | var names = false; |
| 191 | var exports = 0; |
| 192 | if (wasm.functions.length > 0) { |
| 193 | var has_names = false; |
| 194 | |
| 195 | // emit function signatures |
| 196 | if (debug) print("emitting function sigs @ " + bytes.length); |
| 197 | emit_section(bytes, kDeclFunctionSignatures, function(bytes) { |
| 198 | emit_varint(bytes, wasm.functions.length); |
| 199 | for (func of wasm.functions) { |
| 200 | has_names = has_names || (func.name != undefined && |
| 201 | func.name.length > 0); |
| 202 | exports += func.exports.length; |
| 203 | |
| 204 | emit_varint(bytes, func.sig_index); |
| 205 | } |
| 206 | }); |
| 207 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 208 | } |
| 209 | |
| 210 | // Add function table. |
| 211 | if (wasm.function_table.length > 0) { |
| 212 | if (debug) print("emitting function table @ " + bytes.length); |
| 213 | emit_section(bytes, kDeclFunctionTable, function(bytes) { |
| 214 | emit_varint(bytes, wasm.function_table.length); |
| 215 | for (index of wasm.function_table) { |
| 216 | emit_varint(bytes, index); |
| 217 | } |
| 218 | }); |
| 219 | } |
| 220 | |
| 221 | // Add memory section |
| 222 | if (wasm.memory != undefined) { |
| 223 | if (debug) print("emitting memory @ " + bytes.length); |
| 224 | emit_section(bytes, kDeclMemory, function(bytes) { |
| 225 | emit_varint(bytes, wasm.memory.min); |
| 226 | emit_varint(bytes, wasm.memory.max); |
| 227 | emit_u8(bytes, wasm.memory.exp ? 1 : 0); |
| 228 | }); |
| 229 | } |
| 230 | |
| 231 | |
| 232 | // Add export table. |
| 233 | if (exports > 0) { |
| 234 | if (debug) print("emitting exports @ " + bytes.length); |
| 235 | emit_section(bytes, kDeclExportTable, function(bytes) { |
| 236 | emit_varint(bytes, exports); |
| 237 | for (func of wasm.functions) { |
| 238 | for (exp of func.exports) { |
| 239 | emit_varint(bytes, func.index); |
| 240 | emit_string(bytes, exp); |
| 241 | } |
| 242 | } |
| 243 | }); |
| 244 | } |
| 245 | |
| 246 | // Add start function section. |
| 247 | if (wasm.start_index != undefined) { |
| 248 | if (debug) print("emitting start function @ " + bytes.length); |
| 249 | emit_section(bytes, kDeclStartFunction, function(bytes) { |
| 250 | emit_varint(bytes, wasm.start_index); |
| 251 | }); |
| 252 | } |
| 253 | |
| 254 | // Add function bodies. |
| 255 | if (wasm.functions.length > 0) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 256 | // emit function bodies |
| 257 | if (debug) print("emitting function bodies @ " + bytes.length); |
| 258 | emit_section(bytes, kDeclFunctionBodies, function(bytes) { |
| 259 | emit_varint(bytes, wasm.functions.length); |
| 260 | for (func of wasm.functions) { |
| 261 | // Function body length will be patched later. |
| 262 | var local_decls = []; |
| 263 | var l = func.locals; |
| 264 | if (l != undefined) { |
| 265 | var local_decls_count = 0; |
| 266 | if (l.i32_count > 0) { |
| 267 | local_decls.push({count: l.i32_count, type: kAstI32}); |
| 268 | } |
| 269 | if (l.i64_count > 0) { |
| 270 | local_decls.push({count: l.i64_count, type: kAstI64}); |
| 271 | } |
| 272 | if (l.f32_count > 0) { |
| 273 | local_decls.push({count: l.f32_count, type: kAstF32}); |
| 274 | } |
| 275 | if (l.f64_count > 0) { |
| 276 | local_decls.push({count: l.f64_count, type: kAstF64}); |
| 277 | } |
| 278 | } |
| 279 | var header = new Array(); |
| 280 | |
| 281 | emit_varint(header, local_decls.length); |
| 282 | for (decl of local_decls) { |
| 283 | emit_varint(header, decl.count); |
| 284 | emit_u8(header, decl.type); |
| 285 | } |
| 286 | |
| 287 | emit_varint(bytes, header.length + func.body.length); |
| 288 | emit_bytes(bytes, header); |
| 289 | emit_bytes(bytes, func.body); |
| 290 | } |
| 291 | }); |
| 292 | } |
| 293 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 294 | // Add data segments. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 295 | if (wasm.data_segments.length > 0) { |
| 296 | if (debug) print("emitting data segments @ " + bytes.length); |
| 297 | emit_section(bytes, kDeclDataSegments, function(bytes) { |
| 298 | emit_varint(bytes, wasm.data_segments.length); |
| 299 | for (seg of wasm.data_segments) { |
| 300 | emit_varint(bytes, seg.addr); |
| 301 | emit_varint(bytes, seg.data.length); |
| 302 | emit_bytes(bytes, seg.data); |
| 303 | } |
| 304 | }); |
| 305 | } |
| 306 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 307 | // Add any explicitly added sections |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 308 | for (exp of wasm.explicit) { |
| 309 | if (debug) print("emitting explicit @ " + bytes.length); |
| 310 | emit_bytes(bytes, exp); |
| 311 | } |
| 312 | |
Ben Murdoch | c561043 | 2016-08-08 18:44:38 +0100 | [diff] [blame^] | 313 | // Add function names. |
| 314 | if (has_names) { |
| 315 | if (debug) print("emitting names @ " + bytes.length); |
| 316 | emit_section(bytes, kDeclNames, function(bytes) { |
| 317 | emit_varint(bytes, wasm.functions.length); |
| 318 | for (func of wasm.functions) { |
| 319 | var name = func.name == undefined ? "" : func.name; |
| 320 | emit_string(bytes, name); |
| 321 | emit_u8(bytes, 0); // local names count == 0 |
| 322 | } |
| 323 | }); |
| 324 | } |
| 325 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame] | 326 | // End the module. |
| 327 | if (debug) print("emitting end @ " + bytes.length); |
| 328 | emit_section(bytes, kDeclEnd, function(bytes) {}); |
| 329 | |
| 330 | return bytes; |
| 331 | } |
| 332 | |
| 333 | WasmModuleBuilder.prototype.toBuffer = function(debug) { |
| 334 | var bytes = this.toArray(debug); |
| 335 | var buffer = new ArrayBuffer(bytes.length); |
| 336 | var view = new Uint8Array(buffer); |
| 337 | for (var i = 0; i < bytes.length; i++) { |
| 338 | var val = bytes[i]; |
| 339 | if ((typeof val) == "string") val = val.charCodeAt(0); |
| 340 | view[i] = val | 0; |
| 341 | } |
| 342 | return buffer; |
| 343 | } |
| 344 | |
| 345 | WasmModuleBuilder.prototype.instantiate = function(ffi, memory) { |
| 346 | var buffer = this.toBuffer(); |
| 347 | if (memory != undefined) { |
| 348 | return Wasm.instantiateModule(buffer, ffi, memory); |
| 349 | } else { |
| 350 | return Wasm.instantiateModule(buffer, ffi); |
| 351 | } |
| 352 | } |