Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2015 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 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 5 | #include "src/wasm/module-decoder.h" |
| 6 | |
| 7 | #include "src/base/functional.h" |
| 8 | #include "src/base/platform/platform.h" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 9 | #include "src/macro-assembler.h" |
| 10 | #include "src/objects.h" |
| 11 | #include "src/v8.h" |
| 12 | |
| 13 | #include "src/wasm/decoder.h" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 14 | |
| 15 | namespace v8 { |
| 16 | namespace internal { |
| 17 | namespace wasm { |
| 18 | |
| 19 | #if DEBUG |
| 20 | #define TRACE(...) \ |
| 21 | do { \ |
| 22 | if (FLAG_trace_wasm_decoder) PrintF(__VA_ARGS__); \ |
| 23 | } while (false) |
| 24 | #else |
| 25 | #define TRACE(...) |
| 26 | #endif |
| 27 | |
| 28 | |
| 29 | // The main logic for decoding the bytes of a module. |
| 30 | class ModuleDecoder : public Decoder { |
| 31 | public: |
| 32 | ModuleDecoder(Zone* zone, const byte* module_start, const byte* module_end, |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 33 | ModuleOrigin origin) |
| 34 | : Decoder(module_start, module_end), module_zone(zone), origin_(origin) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 35 | result_.start = start_; |
| 36 | if (limit_ < start_) { |
| 37 | error(start_, "end is less than start"); |
| 38 | limit_ = start_; |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | virtual void onFirstError() { |
| 43 | pc_ = limit_; // On error, terminate section decoding loop. |
| 44 | } |
| 45 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 46 | static void DumpModule(WasmModule* module, ModuleResult result) { |
| 47 | std::string path; |
| 48 | if (FLAG_dump_wasm_module_path) { |
| 49 | path = FLAG_dump_wasm_module_path; |
| 50 | if (path.size() && |
| 51 | !base::OS::isDirectorySeparator(path[path.size() - 1])) { |
| 52 | path += base::OS::DirectorySeparator(); |
| 53 | } |
| 54 | } |
| 55 | // File are named `HASH.{ok,failed}.wasm`. |
| 56 | size_t hash = base::hash_range(module->module_start, module->module_end); |
| 57 | char buf[32] = {'\0'}; |
| 58 | #if V8_OS_WIN && _MSC_VER < 1900 |
| 59 | #define snprintf sprintf_s |
| 60 | #endif |
| 61 | snprintf(buf, sizeof(buf) - 1, "%016zx.%s.wasm", hash, |
| 62 | result.ok() ? "ok" : "failed"); |
| 63 | std::string name(buf); |
| 64 | if (FILE* wasm_file = base::OS::FOpen((path + name).c_str(), "wb")) { |
| 65 | fwrite(module->module_start, module->module_end - module->module_start, 1, |
| 66 | wasm_file); |
| 67 | fclose(wasm_file); |
| 68 | } |
| 69 | } |
| 70 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 71 | // Decodes an entire module. |
| 72 | ModuleResult DecodeModule(WasmModule* module, bool verify_functions = true) { |
| 73 | pc_ = start_; |
| 74 | module->module_start = start_; |
| 75 | module->module_end = limit_; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 76 | module->min_mem_pages = 0; |
| 77 | module->max_mem_pages = 0; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 78 | module->mem_export = false; |
| 79 | module->mem_external = false; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 80 | module->origin = origin_; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 81 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 82 | bool sections[(size_t)WasmSection::Code::Max] = {false}; |
| 83 | |
| 84 | const byte* pos = pc_; |
| 85 | uint32_t magic_word = consume_u32("wasm magic"); |
| 86 | #define BYTES(x) (x & 0xff), (x >> 8) & 0xff, (x >> 16) & 0xff, (x >> 24) & 0xff |
| 87 | if (magic_word != kWasmMagic) { |
| 88 | error(pos, pos, |
| 89 | "expected magic word %02x %02x %02x %02x, " |
| 90 | "found %02x %02x %02x %02x", |
| 91 | BYTES(kWasmMagic), BYTES(magic_word)); |
| 92 | goto done; |
| 93 | } |
| 94 | |
| 95 | pos = pc_; |
| 96 | { |
| 97 | uint32_t magic_version = consume_u32("wasm version"); |
| 98 | if (magic_version != kWasmVersion) { |
| 99 | error(pos, pos, |
| 100 | "expected version %02x %02x %02x %02x, " |
| 101 | "found %02x %02x %02x %02x", |
| 102 | BYTES(kWasmVersion), BYTES(magic_version)); |
| 103 | goto done; |
| 104 | } |
| 105 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 106 | |
| 107 | // Decode the module sections. |
| 108 | while (pc_ < limit_) { |
| 109 | TRACE("DecodeSection\n"); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 110 | pos = pc_; |
| 111 | |
| 112 | int length; |
| 113 | uint32_t section_length = consume_u32v(&length, "section size"); |
| 114 | |
| 115 | int section_string_leb_length = 0; |
| 116 | uint32_t section_string_length = 0; |
| 117 | WasmSection::Code section = consume_section_name( |
| 118 | §ion_string_leb_length, §ion_string_length); |
| 119 | uint32_t string_and_leb_length = |
| 120 | section_string_leb_length + section_string_length; |
| 121 | if (string_and_leb_length > section_length) { |
| 122 | error(pos, pos, |
| 123 | "section string of size %u longer than total section bytes %u", |
| 124 | string_and_leb_length, section_length); |
| 125 | break; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 126 | } |
| 127 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 128 | if (section == WasmSection::Code::Max) { |
| 129 | // Skip unknown section. |
| 130 | uint32_t skip = section_length - string_and_leb_length; |
| 131 | TRACE("skipping %u bytes from unknown section\n", skip); |
| 132 | consume_bytes(skip); |
| 133 | continue; |
| 134 | } |
| 135 | |
| 136 | // Each section should appear at most once. |
| 137 | CheckForPreviousSection(sections, section, false); |
| 138 | sections[(size_t)section] = true; |
| 139 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 140 | switch (section) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 141 | case WasmSection::Code::End: |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 142 | // Terminate section decoding. |
| 143 | limit_ = pc_; |
| 144 | break; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 145 | case WasmSection::Code::Memory: |
| 146 | int length; |
| 147 | module->min_mem_pages = consume_u32v(&length, "min memory"); |
| 148 | module->max_mem_pages = consume_u32v(&length, "max memory"); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 149 | module->mem_export = consume_u8("export memory") != 0; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 150 | break; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 151 | case WasmSection::Code::Signatures: { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 152 | int length; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 153 | uint32_t signatures_count = consume_u32v(&length, "signatures count"); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 154 | module->signatures.reserve(SafeReserve(signatures_count)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 155 | // Decode signatures. |
| 156 | for (uint32_t i = 0; i < signatures_count; i++) { |
| 157 | if (failed()) break; |
| 158 | TRACE("DecodeSignature[%d] module+%d\n", i, |
| 159 | static_cast<int>(pc_ - start_)); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 160 | FunctionSig* s = consume_sig(); // read function sig. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 161 | module->signatures.push_back(s); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 162 | } |
| 163 | break; |
| 164 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 165 | case WasmSection::Code::FunctionSignatures: { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 166 | // Functions require a signature table first. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 167 | CheckForPreviousSection(sections, WasmSection::Code::Signatures, |
| 168 | true); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 169 | int length; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 170 | uint32_t functions_count = consume_u32v(&length, "functions count"); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 171 | module->functions.reserve(SafeReserve(functions_count)); |
| 172 | for (uint32_t i = 0; i < functions_count; i++) { |
| 173 | module->functions.push_back( |
| 174 | {nullptr, i, 0, 0, 0, 0, 0, 0, false, false}); |
| 175 | WasmFunction* function = &module->functions.back(); |
| 176 | function->sig_index = consume_sig_index(module, &function->sig); |
| 177 | } |
| 178 | break; |
| 179 | } |
| 180 | case WasmSection::Code::FunctionBodies: { |
| 181 | // Function bodies should follow signatures. |
| 182 | CheckForPreviousSection(sections, |
| 183 | WasmSection::Code::FunctionSignatures, true); |
| 184 | int length; |
| 185 | const byte* pos = pc_; |
| 186 | uint32_t functions_count = consume_u32v(&length, "functions count"); |
| 187 | if (functions_count != module->functions.size()) { |
| 188 | error(pos, pos, "function body count %u mismatch (%u expected)", |
| 189 | functions_count, |
| 190 | static_cast<uint32_t>(module->functions.size())); |
| 191 | break; |
| 192 | } |
| 193 | for (uint32_t i = 0; i < functions_count; i++) { |
| 194 | WasmFunction* function = &module->functions[i]; |
| 195 | int length; |
| 196 | uint32_t size = consume_u32v(&length, "body size"); |
| 197 | function->code_start_offset = pc_offset(); |
| 198 | function->code_end_offset = pc_offset() + size; |
| 199 | |
| 200 | TRACE(" +%d %-20s: (%d bytes)\n", pc_offset(), "function body", |
| 201 | size); |
| 202 | pc_ += size; |
| 203 | if (pc_ > limit_) { |
| 204 | error(pc_, "function body extends beyond end of file"); |
| 205 | } |
| 206 | } |
| 207 | break; |
| 208 | } |
| 209 | case WasmSection::Code::Functions: { |
| 210 | // Functions require a signature table first. |
| 211 | CheckForPreviousSection(sections, WasmSection::Code::Signatures, |
| 212 | true); |
| 213 | int length; |
| 214 | uint32_t functions_count = consume_u32v(&length, "functions count"); |
| 215 | module->functions.reserve(SafeReserve(functions_count)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 216 | // Set up module environment for verification. |
| 217 | ModuleEnv menv; |
| 218 | menv.module = module; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 219 | menv.instance = nullptr; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 220 | menv.origin = origin_; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 221 | // Decode functions. |
| 222 | for (uint32_t i = 0; i < functions_count; i++) { |
| 223 | if (failed()) break; |
| 224 | TRACE("DecodeFunction[%d] module+%d\n", i, |
| 225 | static_cast<int>(pc_ - start_)); |
| 226 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 227 | module->functions.push_back( |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 228 | {nullptr, i, 0, 0, 0, 0, 0, 0, false, false}); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 229 | WasmFunction* function = &module->functions.back(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 230 | DecodeFunctionInModule(module, function, false); |
| 231 | } |
| 232 | if (ok() && verify_functions) { |
| 233 | for (uint32_t i = 0; i < functions_count; i++) { |
| 234 | if (failed()) break; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 235 | WasmFunction* function = &module->functions[i]; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 236 | if (!function->external) { |
| 237 | VerifyFunctionBody(i, &menv, function); |
| 238 | if (result_.failed()) |
| 239 | error(result_.error_pc, result_.error_msg.get()); |
| 240 | } |
| 241 | } |
| 242 | } |
| 243 | break; |
| 244 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 245 | case WasmSection::Code::Names: { |
| 246 | // Names correspond to functions. |
| 247 | CheckForPreviousSection(sections, |
| 248 | WasmSection::Code::FunctionSignatures, true); |
| 249 | int length; |
| 250 | const byte* pos = pc_; |
| 251 | uint32_t functions_count = consume_u32v(&length, "functions count"); |
| 252 | if (functions_count != module->functions.size()) { |
| 253 | error(pos, pos, "function name count %u mismatch (%u expected)", |
| 254 | functions_count, |
| 255 | static_cast<uint32_t>(module->functions.size())); |
| 256 | break; |
| 257 | } |
| 258 | |
| 259 | for (uint32_t i = 0; i < functions_count; i++) { |
| 260 | WasmFunction* function = &module->functions[i]; |
| 261 | function->name_offset = |
| 262 | consume_string(&function->name_length, "function name"); |
| 263 | |
| 264 | uint32_t local_names_count = |
| 265 | consume_u32v(&length, "local names count"); |
| 266 | for (uint32_t j = 0; j < local_names_count; j++) { |
| 267 | uint32_t unused = 0; |
| 268 | uint32_t offset = consume_string(&unused, "local name"); |
| 269 | USE(unused); |
| 270 | USE(offset); |
| 271 | } |
| 272 | } |
| 273 | break; |
| 274 | } |
| 275 | case WasmSection::Code::Globals: { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 276 | int length; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 277 | uint32_t globals_count = consume_u32v(&length, "globals count"); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 278 | module->globals.reserve(SafeReserve(globals_count)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 279 | // Decode globals. |
| 280 | for (uint32_t i = 0; i < globals_count; i++) { |
| 281 | if (failed()) break; |
| 282 | TRACE("DecodeGlobal[%d] module+%d\n", i, |
| 283 | static_cast<int>(pc_ - start_)); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 284 | module->globals.push_back({0, 0, MachineType::Int32(), 0, false}); |
| 285 | WasmGlobal* global = &module->globals.back(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 286 | DecodeGlobalInModule(global); |
| 287 | } |
| 288 | break; |
| 289 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 290 | case WasmSection::Code::DataSegments: { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 291 | int length; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 292 | uint32_t data_segments_count = |
| 293 | consume_u32v(&length, "data segments count"); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 294 | module->data_segments.reserve(SafeReserve(data_segments_count)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 295 | // Decode data segments. |
| 296 | for (uint32_t i = 0; i < data_segments_count; i++) { |
| 297 | if (failed()) break; |
| 298 | TRACE("DecodeDataSegment[%d] module+%d\n", i, |
| 299 | static_cast<int>(pc_ - start_)); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 300 | module->data_segments.push_back({0, 0, 0}); |
| 301 | WasmDataSegment* segment = &module->data_segments.back(); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 302 | DecodeDataSegmentInModule(module, segment); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 303 | } |
| 304 | break; |
| 305 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 306 | case WasmSection::Code::FunctionTable: { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 307 | // An indirect function table requires functions first. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 308 | CheckForFunctions(module, section); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 309 | int length; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 310 | uint32_t function_table_count = |
| 311 | consume_u32v(&length, "function table count"); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 312 | module->function_table.reserve(SafeReserve(function_table_count)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 313 | // Decode function table. |
| 314 | for (uint32_t i = 0; i < function_table_count; i++) { |
| 315 | if (failed()) break; |
| 316 | TRACE("DecodeFunctionTable[%d] module+%d\n", i, |
| 317 | static_cast<int>(pc_ - start_)); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 318 | uint16_t index = consume_u32v(&length); |
| 319 | if (index >= module->functions.size()) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 320 | error(pc_ - 2, "invalid function index"); |
| 321 | break; |
| 322 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 323 | module->function_table.push_back(index); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 324 | } |
| 325 | break; |
| 326 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 327 | case WasmSection::Code::StartFunction: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 328 | // Declares a start function for a module. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 329 | CheckForFunctions(module, section); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 330 | if (module->start_function_index >= 0) { |
| 331 | error("start function already declared"); |
| 332 | break; |
| 333 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 334 | WasmFunction* func; |
| 335 | const byte* pos = pc_; |
| 336 | module->start_function_index = consume_func_index(module, &func); |
| 337 | if (func && func->sig->parameter_count() > 0) { |
| 338 | error(pos, "invalid start function: non-zero parameter count"); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 339 | break; |
| 340 | } |
| 341 | break; |
| 342 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 343 | case WasmSection::Code::ImportTable: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 344 | // Declares an import table. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 345 | CheckForPreviousSection(sections, WasmSection::Code::Signatures, |
| 346 | true); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 347 | int length; |
| 348 | uint32_t import_table_count = |
| 349 | consume_u32v(&length, "import table count"); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 350 | module->import_table.reserve(SafeReserve(import_table_count)); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 351 | // Decode import table. |
| 352 | for (uint32_t i = 0; i < import_table_count; i++) { |
| 353 | if (failed()) break; |
| 354 | TRACE("DecodeImportTable[%d] module+%d\n", i, |
| 355 | static_cast<int>(pc_ - start_)); |
| 356 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 357 | module->import_table.push_back({nullptr, 0, 0}); |
| 358 | WasmImport* import = &module->import_table.back(); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 359 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 360 | import->sig_index = consume_sig_index(module, &import->sig); |
| 361 | const byte* pos = pc_; |
| 362 | import->module_name_offset = consume_string( |
| 363 | &import->module_name_length, "import module name"); |
| 364 | if (import->module_name_length == 0) { |
| 365 | error(pos, "import module name cannot be NULL"); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 366 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 367 | import->function_name_offset = consume_string( |
| 368 | &import->function_name_length, "import function name"); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 369 | } |
| 370 | break; |
| 371 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 372 | case WasmSection::Code::ExportTable: { |
| 373 | // Declares an export table. |
| 374 | CheckForFunctions(module, section); |
| 375 | int length; |
| 376 | uint32_t export_table_count = |
| 377 | consume_u32v(&length, "export table count"); |
| 378 | module->export_table.reserve(SafeReserve(export_table_count)); |
| 379 | // Decode export table. |
| 380 | for (uint32_t i = 0; i < export_table_count; i++) { |
| 381 | if (failed()) break; |
| 382 | TRACE("DecodeExportTable[%d] module+%d\n", i, |
| 383 | static_cast<int>(pc_ - start_)); |
| 384 | |
| 385 | module->export_table.push_back({0, 0}); |
| 386 | WasmExport* exp = &module->export_table.back(); |
| 387 | |
| 388 | WasmFunction* func; |
| 389 | exp->func_index = consume_func_index(module, &func); |
| 390 | exp->name_offset = consume_string(&exp->name_length, "export name"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 391 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 392 | break; |
| 393 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 394 | case WasmSection::Code::Max: |
| 395 | UNREACHABLE(); // Already skipped unknown sections. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 396 | } |
| 397 | } |
| 398 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 399 | done: |
| 400 | ModuleResult result = toResult(module); |
| 401 | if (FLAG_dump_wasm_module) { |
| 402 | DumpModule(module, result); |
| 403 | } |
| 404 | return result; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 405 | } |
| 406 | |
| 407 | uint32_t SafeReserve(uint32_t count) { |
| 408 | // Avoid OOM by only reserving up to a certain size. |
| 409 | const uint32_t kMaxReserve = 20000; |
| 410 | return count < kMaxReserve ? count : kMaxReserve; |
| 411 | } |
| 412 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 413 | void CheckForFunctions(WasmModule* module, WasmSection::Code section) { |
| 414 | if (module->functions.size() == 0) { |
| 415 | error(pc_ - 1, nullptr, "functions must appear before section %s", |
| 416 | WasmSection::getName(section)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 417 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 418 | } |
| 419 | |
| 420 | void CheckForPreviousSection(bool* sections, WasmSection::Code section, |
| 421 | bool present) { |
| 422 | if (section >= WasmSection::Code::Max) return; |
| 423 | if (sections[(size_t)section] == present) return; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 424 | if (present) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 425 | error(pc_ - 1, nullptr, "required %s section missing", |
| 426 | WasmSection::getName(section)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 427 | } else { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 428 | error(pc_ - 1, nullptr, "%s section already present", |
| 429 | WasmSection::getName(section)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 430 | } |
| 431 | } |
| 432 | |
| 433 | // Decodes a single anonymous function starting at {start_}. |
| 434 | FunctionResult DecodeSingleFunction(ModuleEnv* module_env, |
| 435 | WasmFunction* function) { |
| 436 | pc_ = start_; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 437 | function->sig = consume_sig(); // read signature |
| 438 | function->name_offset = 0; // ---- name |
| 439 | function->name_length = 0; // ---- name length |
| 440 | function->code_start_offset = off(pc_); // ---- code start |
| 441 | function->code_end_offset = off(limit_); // ---- code end |
| 442 | function->exported = false; // ---- exported |
| 443 | function->external = false; // ---- external |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 444 | |
| 445 | if (ok()) VerifyFunctionBody(0, module_env, function); |
| 446 | |
| 447 | FunctionResult result; |
| 448 | result.CopyFrom(result_); // Copy error code and location. |
| 449 | result.val = function; |
| 450 | return result; |
| 451 | } |
| 452 | |
| 453 | // Decodes a single function signature at {start}. |
| 454 | FunctionSig* DecodeFunctionSignature(const byte* start) { |
| 455 | pc_ = start; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 456 | FunctionSig* result = consume_sig(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 457 | return ok() ? result : nullptr; |
| 458 | } |
| 459 | |
| 460 | private: |
| 461 | Zone* module_zone; |
| 462 | ModuleResult result_; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 463 | ModuleOrigin origin_; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 464 | |
| 465 | uint32_t off(const byte* ptr) { return static_cast<uint32_t>(ptr - start_); } |
| 466 | |
| 467 | // Decodes a single global entry inside a module starting at {pc_}. |
| 468 | void DecodeGlobalInModule(WasmGlobal* global) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 469 | global->name_offset = consume_string(&global->name_length, "global name"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 470 | global->type = mem_type(); |
| 471 | global->offset = 0; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 472 | global->exported = consume_u8("exported") != 0; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 473 | } |
| 474 | |
| 475 | // Decodes a single function entry inside a module starting at {pc_}. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 476 | // TODO(titzer): legacy function body; remove |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 477 | void DecodeFunctionInModule(WasmModule* module, WasmFunction* function, |
| 478 | bool verify_body = true) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 479 | byte decl_bits = consume_u8("function decl"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 480 | |
| 481 | const byte* sigpos = pc_; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 482 | function->sig_index = consume_u16("signature index"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 483 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 484 | if (function->sig_index >= module->signatures.size()) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 485 | return error(sigpos, "invalid signature index"); |
| 486 | } else { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 487 | function->sig = module->signatures[function->sig_index]; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 488 | } |
| 489 | |
| 490 | TRACE(" +%d <function attributes:%s%s%s%s%s>\n", |
| 491 | static_cast<int>(pc_ - start_), |
| 492 | decl_bits & kDeclFunctionName ? " name" : "", |
| 493 | decl_bits & kDeclFunctionImport ? " imported" : "", |
| 494 | decl_bits & kDeclFunctionLocals ? " locals" : "", |
| 495 | decl_bits & kDeclFunctionExport ? " exported" : "", |
| 496 | (decl_bits & kDeclFunctionImport) == 0 ? " body" : ""); |
| 497 | |
| 498 | if (decl_bits & kDeclFunctionName) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 499 | function->name_offset = |
| 500 | consume_string(&function->name_length, "function name"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 501 | } |
| 502 | |
| 503 | function->exported = decl_bits & kDeclFunctionExport; |
| 504 | |
| 505 | // Imported functions have no locals or body. |
| 506 | if (decl_bits & kDeclFunctionImport) { |
| 507 | function->external = true; |
| 508 | return; |
| 509 | } |
| 510 | |
| 511 | if (decl_bits & kDeclFunctionLocals) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 512 | function->local_i32_count = consume_u16("i32 count"); |
| 513 | function->local_i64_count = consume_u16("i64 count"); |
| 514 | function->local_f32_count = consume_u16("f32 count"); |
| 515 | function->local_f64_count = consume_u16("f64 count"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 516 | } |
| 517 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 518 | uint16_t size = consume_u16("body size"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 519 | if (ok()) { |
| 520 | if ((pc_ + size) > limit_) { |
| 521 | return error(pc_, limit_, |
| 522 | "expected %d bytes for function body, fell off end", size); |
| 523 | } |
| 524 | function->code_start_offset = static_cast<uint32_t>(pc_ - start_); |
| 525 | function->code_end_offset = function->code_start_offset + size; |
| 526 | TRACE(" +%d %-20s: (%d bytes)\n", static_cast<int>(pc_ - start_), |
| 527 | "function body", size); |
| 528 | pc_ += size; |
| 529 | } |
| 530 | } |
| 531 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 532 | bool IsWithinLimit(uint32_t limit, uint32_t offset, uint32_t size) { |
| 533 | if (offset > limit) return false; |
| 534 | if ((offset + size) < offset) return false; // overflow |
| 535 | return (offset + size) <= limit; |
| 536 | } |
| 537 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 538 | // Decodes a single data segment entry inside a module starting at {pc_}. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 539 | void DecodeDataSegmentInModule(WasmModule* module, WasmDataSegment* segment) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 540 | const byte* start = pc_; |
| 541 | int length; |
| 542 | segment->dest_addr = consume_u32v(&length, "destination"); |
| 543 | segment->source_size = consume_u32v(&length, "source size"); |
| 544 | segment->source_offset = static_cast<uint32_t>(pc_ - start_); |
| 545 | segment->init = true; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 546 | |
| 547 | // Validate the data is in the module. |
| 548 | uint32_t module_limit = static_cast<uint32_t>(limit_ - start_); |
| 549 | if (!IsWithinLimit(module_limit, segment->source_offset, |
| 550 | segment->source_size)) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 551 | error(start, "segment out of bounds of module"); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 552 | } |
| 553 | |
| 554 | // Validate that the segment will fit into the (minimum) memory. |
| 555 | uint32_t memory_limit = |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 556 | WasmModule::kPageSize * (module ? module->min_mem_pages |
| 557 | : WasmModule::kMaxMemPages); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 558 | if (!IsWithinLimit(memory_limit, segment->dest_addr, |
| 559 | segment->source_size)) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 560 | error(start, "segment out of bounds of memory"); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 561 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 562 | |
| 563 | consume_bytes(segment->source_size); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 564 | } |
| 565 | |
| 566 | // Verifies the body (code) of a given function. |
| 567 | void VerifyFunctionBody(uint32_t func_num, ModuleEnv* menv, |
| 568 | WasmFunction* function) { |
| 569 | if (FLAG_trace_wasm_decode_time) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 570 | OFStream os(stdout); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 571 | os << "Verifying WASM function " << WasmFunctionName(function, menv) |
| 572 | << std::endl; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 573 | os << std::endl; |
| 574 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 575 | FunctionBody body = {menv, function->sig, start_, |
| 576 | start_ + function->code_start_offset, |
| 577 | start_ + function->code_end_offset}; |
| 578 | TreeResult result = VerifyWasmCode(module_zone->allocator(), body); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 579 | if (result.failed()) { |
| 580 | // Wrap the error message from the function decoder. |
| 581 | std::ostringstream str; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 582 | str << "in function " << WasmFunctionName(function, menv) << ": "; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 583 | str << result; |
| 584 | std::string strval = str.str(); |
| 585 | const char* raw = strval.c_str(); |
| 586 | size_t len = strlen(raw); |
| 587 | char* buffer = new char[len]; |
| 588 | strncpy(buffer, raw, len); |
| 589 | buffer[len - 1] = 0; |
| 590 | |
| 591 | // Copy error code and location. |
| 592 | result_.CopyFrom(result); |
| 593 | result_.error_msg.Reset(buffer); |
| 594 | } |
| 595 | } |
| 596 | |
| 597 | // Reads a single 32-bit unsigned integer interpreted as an offset, checking |
| 598 | // the offset is within bounds and advances. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 599 | uint32_t consume_offset(const char* name = nullptr) { |
| 600 | uint32_t offset = consume_u32(name ? name : "offset"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 601 | if (offset > static_cast<uint32_t>(limit_ - start_)) { |
| 602 | error(pc_ - sizeof(uint32_t), "offset out of bounds of module"); |
| 603 | } |
| 604 | return offset; |
| 605 | } |
| 606 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 607 | // Reads a length-prefixed string, checking that it is within bounds. Returns |
| 608 | // the offset of the string, and the length as an out parameter. |
| 609 | uint32_t consume_string(uint32_t* length, const char* name = nullptr) { |
| 610 | int varint_length; |
| 611 | *length = consume_u32v(&varint_length, "string length"); |
| 612 | uint32_t offset = pc_offset(); |
| 613 | TRACE(" +%u %-20s: (%u bytes)\n", offset, "string", *length); |
| 614 | consume_bytes(*length); |
| 615 | return offset; |
| 616 | } |
| 617 | |
| 618 | uint32_t consume_sig_index(WasmModule* module, FunctionSig** sig) { |
| 619 | const byte* pos = pc_; |
| 620 | int length; |
| 621 | uint32_t sig_index = consume_u32v(&length, "signature index"); |
| 622 | if (sig_index >= module->signatures.size()) { |
| 623 | error(pos, pos, "signature index %u out of bounds (%d signatures)", |
| 624 | sig_index, static_cast<int>(module->signatures.size())); |
| 625 | *sig = nullptr; |
| 626 | return 0; |
| 627 | } |
| 628 | *sig = module->signatures[sig_index]; |
| 629 | return sig_index; |
| 630 | } |
| 631 | |
| 632 | uint32_t consume_func_index(WasmModule* module, WasmFunction** func) { |
| 633 | const byte* pos = pc_; |
| 634 | int length; |
| 635 | uint32_t func_index = consume_u32v(&length, "function index"); |
| 636 | if (func_index >= module->functions.size()) { |
| 637 | error(pos, pos, "function index %u out of bounds (%d functions)", |
| 638 | func_index, static_cast<int>(module->functions.size())); |
| 639 | *func = nullptr; |
| 640 | return 0; |
| 641 | } |
| 642 | *func = &module->functions[func_index]; |
| 643 | return func_index; |
| 644 | } |
| 645 | |
| 646 | // Reads a section name. |
| 647 | WasmSection::Code consume_section_name(int* string_leb_length, |
| 648 | uint32_t* string_length) { |
| 649 | *string_length = consume_u32v(string_leb_length, "name length"); |
| 650 | const byte* start = pc_; |
| 651 | consume_bytes(*string_length); |
| 652 | if (failed()) { |
| 653 | TRACE("Section name of length %u couldn't be read\n", *string_length); |
| 654 | return WasmSection::Code::Max; |
| 655 | } |
| 656 | // TODO(jfb) Linear search, it may be better to do a common-prefix search. |
| 657 | for (WasmSection::Code i = WasmSection::begin(); i != WasmSection::end(); |
| 658 | i = WasmSection::next(i)) { |
| 659 | if (WasmSection::getNameLength(i) == *string_length && |
| 660 | 0 == memcmp(WasmSection::getName(i), start, *string_length)) { |
| 661 | return i; |
| 662 | } |
| 663 | } |
| 664 | TRACE("Unknown section: '"); |
| 665 | for (uint32_t i = 0; i != *string_length; ++i) TRACE("%c", *(start + i)); |
| 666 | TRACE("'\n"); |
| 667 | return WasmSection::Code::Max; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 668 | } |
| 669 | |
| 670 | // Reads a single 8-bit integer, interpreting it as a local type. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 671 | LocalType consume_local_type() { |
| 672 | byte val = consume_u8("local type"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 673 | LocalTypeCode t = static_cast<LocalTypeCode>(val); |
| 674 | switch (t) { |
| 675 | case kLocalVoid: |
| 676 | return kAstStmt; |
| 677 | case kLocalI32: |
| 678 | return kAstI32; |
| 679 | case kLocalI64: |
| 680 | return kAstI64; |
| 681 | case kLocalF32: |
| 682 | return kAstF32; |
| 683 | case kLocalF64: |
| 684 | return kAstF64; |
| 685 | default: |
| 686 | error(pc_ - 1, "invalid local type"); |
| 687 | return kAstStmt; |
| 688 | } |
| 689 | } |
| 690 | |
| 691 | // Reads a single 8-bit integer, interpreting it as a memory type. |
| 692 | MachineType mem_type() { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 693 | byte val = consume_u8("memory type"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 694 | MemTypeCode t = static_cast<MemTypeCode>(val); |
| 695 | switch (t) { |
| 696 | case kMemI8: |
| 697 | return MachineType::Int8(); |
| 698 | case kMemU8: |
| 699 | return MachineType::Uint8(); |
| 700 | case kMemI16: |
| 701 | return MachineType::Int16(); |
| 702 | case kMemU16: |
| 703 | return MachineType::Uint16(); |
| 704 | case kMemI32: |
| 705 | return MachineType::Int32(); |
| 706 | case kMemU32: |
| 707 | return MachineType::Uint32(); |
| 708 | case kMemI64: |
| 709 | return MachineType::Int64(); |
| 710 | case kMemU64: |
| 711 | return MachineType::Uint64(); |
| 712 | case kMemF32: |
| 713 | return MachineType::Float32(); |
| 714 | case kMemF64: |
| 715 | return MachineType::Float64(); |
| 716 | default: |
| 717 | error(pc_ - 1, "invalid memory type"); |
| 718 | return MachineType::None(); |
| 719 | } |
| 720 | } |
| 721 | |
| 722 | // Parses an inline function signature. |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 723 | FunctionSig* consume_sig() { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 724 | int length; |
| 725 | byte count = consume_u32v(&length, "param count"); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 726 | LocalType ret = consume_local_type(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 727 | FunctionSig::Builder builder(module_zone, ret == kAstStmt ? 0 : 1, count); |
| 728 | if (ret != kAstStmt) builder.AddReturn(ret); |
| 729 | |
| 730 | for (int i = 0; i < count; i++) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 731 | LocalType param = consume_local_type(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 732 | if (param == kAstStmt) error(pc_ - 1, "invalid void parameter type"); |
| 733 | builder.AddParam(param); |
| 734 | } |
| 735 | return builder.Build(); |
| 736 | } |
| 737 | }; |
| 738 | |
| 739 | |
| 740 | // Helpers for nice error messages. |
| 741 | class ModuleError : public ModuleResult { |
| 742 | public: |
| 743 | explicit ModuleError(const char* msg) { |
| 744 | error_code = kError; |
| 745 | size_t len = strlen(msg) + 1; |
| 746 | char* result = new char[len]; |
| 747 | strncpy(result, msg, len); |
| 748 | result[len - 1] = 0; |
| 749 | error_msg.Reset(result); |
| 750 | } |
| 751 | }; |
| 752 | |
| 753 | |
| 754 | // Helpers for nice error messages. |
| 755 | class FunctionError : public FunctionResult { |
| 756 | public: |
| 757 | explicit FunctionError(const char* msg) { |
| 758 | error_code = kError; |
| 759 | size_t len = strlen(msg) + 1; |
| 760 | char* result = new char[len]; |
| 761 | strncpy(result, msg, len); |
| 762 | result[len - 1] = 0; |
| 763 | error_msg.Reset(result); |
| 764 | } |
| 765 | }; |
| 766 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 767 | ModuleResult DecodeWasmModule(Isolate* isolate, Zone* zone, |
| 768 | const byte* module_start, const byte* module_end, |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 769 | bool verify_functions, ModuleOrigin origin) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 770 | size_t size = module_end - module_start; |
| 771 | if (module_start > module_end) return ModuleError("start > end"); |
| 772 | if (size >= kMaxModuleSize) return ModuleError("size > maximum module size"); |
| 773 | WasmModule* module = new WasmModule(); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 774 | ModuleDecoder decoder(zone, module_start, module_end, origin); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 775 | return decoder.DecodeModule(module, verify_functions); |
| 776 | } |
| 777 | |
| 778 | |
| 779 | FunctionSig* DecodeWasmSignatureForTesting(Zone* zone, const byte* start, |
| 780 | const byte* end) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 781 | ModuleDecoder decoder(zone, start, end, kWasmOrigin); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 782 | return decoder.DecodeFunctionSignature(start); |
| 783 | } |
| 784 | |
| 785 | |
| 786 | FunctionResult DecodeWasmFunction(Isolate* isolate, Zone* zone, |
| 787 | ModuleEnv* module_env, |
| 788 | const byte* function_start, |
| 789 | const byte* function_end) { |
| 790 | size_t size = function_end - function_start; |
| 791 | if (function_start > function_end) return FunctionError("start > end"); |
| 792 | if (size > kMaxFunctionSize) |
| 793 | return FunctionError("size > maximum function size"); |
| 794 | WasmFunction* function = new WasmFunction(); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 795 | ModuleDecoder decoder(zone, function_start, function_end, kWasmOrigin); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 796 | return decoder.DecodeSingleFunction(module_env, function); |
| 797 | } |
| 798 | } // namespace wasm |
| 799 | } // namespace internal |
| 800 | } // namespace v8 |