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 | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 5 | #include "src/signature.h" |
| 6 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 7 | #include "src/bit-vector.h" |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 8 | #include "src/flags.h" |
| 9 | #include "src/handles.h" |
| 10 | #include "src/zone-containers.h" |
| 11 | |
| 12 | #include "src/wasm/ast-decoder.h" |
| 13 | #include "src/wasm/decoder.h" |
| 14 | #include "src/wasm/wasm-module.h" |
| 15 | #include "src/wasm/wasm-opcodes.h" |
| 16 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 17 | #include "src/ostreams.h" |
| 18 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 19 | #include "src/compiler/wasm-compiler.h" |
| 20 | |
| 21 | namespace v8 { |
| 22 | namespace internal { |
| 23 | namespace wasm { |
| 24 | |
| 25 | #if DEBUG |
| 26 | #define TRACE(...) \ |
| 27 | do { \ |
| 28 | if (FLAG_trace_wasm_decoder) PrintF(__VA_ARGS__); \ |
| 29 | } while (false) |
| 30 | #else |
| 31 | #define TRACE(...) |
| 32 | #endif |
| 33 | |
| 34 | // The root of a decoded tree. |
| 35 | struct Tree { |
| 36 | LocalType type; // tree type. |
| 37 | uint32_t count; // number of children. |
| 38 | const byte* pc; // start of the syntax tree. |
| 39 | TFNode* node; // node in the TurboFan graph. |
| 40 | Tree* children[1]; // pointers to children. |
| 41 | |
| 42 | WasmOpcode opcode() const { return static_cast<WasmOpcode>(*pc); } |
| 43 | }; |
| 44 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 45 | // A production represents an incomplete decoded tree in the LR decoder. |
| 46 | struct Production { |
| 47 | Tree* tree; // the root of the syntax tree. |
| 48 | int index; // the current index into the children of the tree. |
| 49 | |
| 50 | WasmOpcode opcode() const { return static_cast<WasmOpcode>(*pc()); } |
| 51 | const byte* pc() const { return tree->pc; } |
| 52 | bool done() const { return index >= static_cast<int>(tree->count); } |
| 53 | Tree* last() const { return index > 0 ? tree->children[index - 1] : nullptr; } |
| 54 | }; |
| 55 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 56 | // An SsaEnv environment carries the current local variable renaming |
| 57 | // as well as the current effect and control dependency in the TF graph. |
| 58 | // It maintains a control state that tracks whether the environment |
| 59 | // is reachable, has reached a control end, or has been merged. |
| 60 | struct SsaEnv { |
| 61 | enum State { kControlEnd, kUnreachable, kReached, kMerged }; |
| 62 | |
| 63 | State state; |
| 64 | TFNode* control; |
| 65 | TFNode* effect; |
| 66 | TFNode** locals; |
| 67 | |
| 68 | bool go() { return state >= kReached; } |
| 69 | void Kill(State new_state = kControlEnd) { |
| 70 | state = new_state; |
| 71 | locals = nullptr; |
| 72 | control = nullptr; |
| 73 | effect = nullptr; |
| 74 | } |
| 75 | }; |
| 76 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 77 | // An entry in the stack of blocks during decoding. |
| 78 | struct Block { |
| 79 | SsaEnv* ssa_env; // SSA renaming environment. |
| 80 | int stack_depth; // production stack depth. |
| 81 | }; |
| 82 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 83 | // An entry in the stack of ifs during decoding. |
| 84 | struct IfEnv { |
| 85 | SsaEnv* false_env; |
| 86 | SsaEnv* merge_env; |
| 87 | SsaEnv** case_envs; |
| 88 | }; |
| 89 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 90 | // Macros that build nodes only if there is a graph and the current SSA |
| 91 | // environment is reachable from start. This avoids problems with malformed |
| 92 | // TF graphs when decoding inputs that have unreachable code. |
| 93 | #define BUILD(func, ...) (build() ? builder_->func(__VA_ARGS__) : nullptr) |
| 94 | #define BUILD0(func) (build() ? builder_->func() : nullptr) |
| 95 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 96 | // Generic Wasm bytecode decoder with utilities for decoding operands, |
| 97 | // lengths, etc. |
| 98 | class WasmDecoder : public Decoder { |
| 99 | public: |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 100 | WasmDecoder(ModuleEnv* module, FunctionSig* sig, const byte* start, |
| 101 | const byte* end) |
| 102 | : Decoder(start, end), |
| 103 | module_(module), |
| 104 | sig_(sig), |
| 105 | total_locals_(0), |
| 106 | local_types_(nullptr) {} |
| 107 | ModuleEnv* module_; |
| 108 | FunctionSig* sig_; |
| 109 | size_t total_locals_; |
| 110 | ZoneVector<LocalType>* local_types_; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 111 | |
| 112 | byte ByteOperand(const byte* pc, const char* msg = "missing 1-byte operand") { |
| 113 | if ((pc + sizeof(byte)) >= limit_) { |
| 114 | error(pc, msg); |
| 115 | return 0; |
| 116 | } |
| 117 | return pc[1]; |
| 118 | } |
| 119 | |
| 120 | uint32_t Uint32Operand(const byte* pc) { |
| 121 | if ((pc + sizeof(uint32_t)) >= limit_) { |
| 122 | error(pc, "missing 4-byte operand"); |
| 123 | return 0; |
| 124 | } |
| 125 | return read_u32(pc + 1); |
| 126 | } |
| 127 | |
| 128 | uint64_t Uint64Operand(const byte* pc) { |
| 129 | if ((pc + sizeof(uint64_t)) >= limit_) { |
| 130 | error(pc, "missing 8-byte operand"); |
| 131 | return 0; |
| 132 | } |
| 133 | return read_u64(pc + 1); |
| 134 | } |
| 135 | |
| 136 | inline bool Validate(const byte* pc, LocalIndexOperand& operand) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 137 | if (operand.index < total_locals_) { |
| 138 | if (local_types_) { |
| 139 | operand.type = local_types_->at(operand.index); |
| 140 | } else { |
| 141 | operand.type = kAstStmt; |
| 142 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 143 | return true; |
| 144 | } |
| 145 | error(pc, pc + 1, "invalid local index"); |
| 146 | return false; |
| 147 | } |
| 148 | |
| 149 | inline bool Validate(const byte* pc, GlobalIndexOperand& operand) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 150 | ModuleEnv* m = module_; |
| 151 | if (m && m->module && operand.index < m->module->globals.size()) { |
| 152 | operand.machine_type = m->module->globals[operand.index].type; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 153 | operand.type = WasmOpcodes::LocalTypeFor(operand.machine_type); |
| 154 | return true; |
| 155 | } |
| 156 | error(pc, pc + 1, "invalid global index"); |
| 157 | return false; |
| 158 | } |
| 159 | |
| 160 | inline bool Validate(const byte* pc, FunctionIndexOperand& operand) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 161 | ModuleEnv* m = module_; |
| 162 | if (m && m->module && operand.index < m->module->functions.size()) { |
| 163 | operand.sig = m->module->functions[operand.index].sig; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 164 | return true; |
| 165 | } |
| 166 | error(pc, pc + 1, "invalid function index"); |
| 167 | return false; |
| 168 | } |
| 169 | |
| 170 | inline bool Validate(const byte* pc, SignatureIndexOperand& operand) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 171 | ModuleEnv* m = module_; |
| 172 | if (m && m->module && operand.index < m->module->signatures.size()) { |
| 173 | operand.sig = m->module->signatures[operand.index]; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 174 | return true; |
| 175 | } |
| 176 | error(pc, pc + 1, "invalid signature index"); |
| 177 | return false; |
| 178 | } |
| 179 | |
| 180 | inline bool Validate(const byte* pc, ImportIndexOperand& operand) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 181 | ModuleEnv* m = module_; |
| 182 | if (m && m->module && operand.index < m->module->import_table.size()) { |
| 183 | operand.sig = m->module->import_table[operand.index].sig; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 184 | return true; |
| 185 | } |
| 186 | error(pc, pc + 1, "invalid signature index"); |
| 187 | return false; |
| 188 | } |
| 189 | |
| 190 | inline bool Validate(const byte* pc, BreakDepthOperand& operand, |
| 191 | ZoneVector<Block>& blocks) { |
| 192 | if (operand.depth < blocks.size()) { |
| 193 | operand.target = &blocks[blocks.size() - operand.depth - 1]; |
| 194 | return true; |
| 195 | } |
| 196 | error(pc, pc + 1, "invalid break depth"); |
| 197 | return false; |
| 198 | } |
| 199 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 200 | bool Validate(const byte* pc, BranchTableOperand& operand, |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 201 | size_t block_depth) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 202 | // Verify table. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 203 | for (uint32_t i = 0; i < operand.table_count + 1; i++) { |
| 204 | uint32_t target = operand.read_entry(this, i); |
| 205 | if (target >= block_depth) { |
| 206 | error(operand.table + i * 2, "improper branch in br_table"); |
| 207 | return false; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 208 | } |
| 209 | } |
| 210 | return true; |
| 211 | } |
| 212 | |
| 213 | int OpcodeArity(const byte* pc) { |
| 214 | #define DECLARE_ARITY(name, ...) \ |
| 215 | static const LocalType kTypes_##name[] = {__VA_ARGS__}; \ |
| 216 | static const int kArity_##name = \ |
| 217 | static_cast<int>(arraysize(kTypes_##name) - 1); |
| 218 | |
| 219 | FOREACH_SIGNATURE(DECLARE_ARITY); |
| 220 | #undef DECLARE_ARITY |
| 221 | |
| 222 | switch (static_cast<WasmOpcode>(*pc)) { |
| 223 | case kExprI8Const: |
| 224 | case kExprI32Const: |
| 225 | case kExprI64Const: |
| 226 | case kExprF64Const: |
| 227 | case kExprF32Const: |
| 228 | case kExprGetLocal: |
| 229 | case kExprLoadGlobal: |
| 230 | case kExprNop: |
| 231 | case kExprUnreachable: |
| 232 | return 0; |
| 233 | |
| 234 | case kExprBr: |
| 235 | case kExprStoreGlobal: |
| 236 | case kExprSetLocal: |
| 237 | return 1; |
| 238 | |
| 239 | case kExprIf: |
| 240 | case kExprBrIf: |
| 241 | return 2; |
| 242 | case kExprIfElse: |
| 243 | case kExprSelect: |
| 244 | return 3; |
| 245 | |
| 246 | case kExprBlock: |
| 247 | case kExprLoop: { |
| 248 | BlockCountOperand operand(this, pc); |
| 249 | return operand.count; |
| 250 | } |
| 251 | |
| 252 | case kExprCallFunction: { |
| 253 | FunctionIndexOperand operand(this, pc); |
| 254 | return static_cast<int>( |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 255 | module_->GetFunctionSignature(operand.index)->parameter_count()); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 256 | } |
| 257 | case kExprCallIndirect: { |
| 258 | SignatureIndexOperand operand(this, pc); |
| 259 | return 1 + static_cast<int>( |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 260 | module_->GetSignature(operand.index)->parameter_count()); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 261 | } |
| 262 | case kExprCallImport: { |
| 263 | ImportIndexOperand operand(this, pc); |
| 264 | return static_cast<int>( |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 265 | module_->GetImportSignature(operand.index)->parameter_count()); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 266 | } |
| 267 | case kExprReturn: { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 268 | return static_cast<int>(sig_->return_count()); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 269 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 270 | case kExprBrTable: { |
| 271 | return 1; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | #define DECLARE_OPCODE_CASE(name, opcode, sig) \ |
| 275 | case kExpr##name: \ |
| 276 | return kArity_##sig; |
| 277 | |
| 278 | FOREACH_LOAD_MEM_OPCODE(DECLARE_OPCODE_CASE) |
| 279 | FOREACH_STORE_MEM_OPCODE(DECLARE_OPCODE_CASE) |
| 280 | FOREACH_MISC_MEM_OPCODE(DECLARE_OPCODE_CASE) |
| 281 | FOREACH_SIMPLE_OPCODE(DECLARE_OPCODE_CASE) |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 282 | FOREACH_ASMJS_COMPAT_OPCODE(DECLARE_OPCODE_CASE) |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 283 | #undef DECLARE_OPCODE_CASE |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 284 | case kExprDeclLocals: |
| 285 | default: |
| 286 | UNREACHABLE(); |
| 287 | return 0; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 288 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 289 | } |
| 290 | |
| 291 | int OpcodeLength(const byte* pc) { |
| 292 | switch (static_cast<WasmOpcode>(*pc)) { |
| 293 | #define DECLARE_OPCODE_CASE(name, opcode, sig) case kExpr##name: |
| 294 | FOREACH_LOAD_MEM_OPCODE(DECLARE_OPCODE_CASE) |
| 295 | FOREACH_STORE_MEM_OPCODE(DECLARE_OPCODE_CASE) |
| 296 | #undef DECLARE_OPCODE_CASE |
| 297 | { |
| 298 | MemoryAccessOperand operand(this, pc); |
| 299 | return 1 + operand.length; |
| 300 | } |
| 301 | case kExprBlock: |
| 302 | case kExprLoop: { |
| 303 | BlockCountOperand operand(this, pc); |
| 304 | return 1 + operand.length; |
| 305 | } |
| 306 | case kExprBr: |
| 307 | case kExprBrIf: { |
| 308 | BreakDepthOperand operand(this, pc); |
| 309 | return 1 + operand.length; |
| 310 | } |
| 311 | case kExprStoreGlobal: |
| 312 | case kExprLoadGlobal: { |
| 313 | GlobalIndexOperand operand(this, pc); |
| 314 | return 1 + operand.length; |
| 315 | } |
| 316 | |
| 317 | case kExprCallFunction: { |
| 318 | FunctionIndexOperand operand(this, pc); |
| 319 | return 1 + operand.length; |
| 320 | } |
| 321 | case kExprCallIndirect: { |
| 322 | SignatureIndexOperand operand(this, pc); |
| 323 | return 1 + operand.length; |
| 324 | } |
| 325 | case kExprCallImport: { |
| 326 | ImportIndexOperand operand(this, pc); |
| 327 | return 1 + operand.length; |
| 328 | } |
| 329 | |
| 330 | case kExprSetLocal: |
| 331 | case kExprGetLocal: { |
| 332 | LocalIndexOperand operand(this, pc); |
| 333 | return 1 + operand.length; |
| 334 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 335 | case kExprBrTable: { |
| 336 | BranchTableOperand operand(this, pc); |
| 337 | return 1 + operand.length; |
| 338 | } |
| 339 | case kExprI32Const: { |
| 340 | ImmI32Operand operand(this, pc); |
| 341 | return 1 + operand.length; |
| 342 | } |
| 343 | case kExprI64Const: { |
| 344 | ImmI64Operand operand(this, pc); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 345 | return 1 + operand.length; |
| 346 | } |
| 347 | case kExprI8Const: |
| 348 | return 2; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 349 | case kExprF32Const: |
| 350 | return 5; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 351 | case kExprF64Const: |
| 352 | return 9; |
| 353 | |
| 354 | default: |
| 355 | return 1; |
| 356 | } |
| 357 | } |
| 358 | }; |
| 359 | |
| 360 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 361 | // A shift-reduce-parser strategy for decoding Wasm code that uses an explicit |
| 362 | // shift-reduce strategy with multiple internal stacks. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 363 | class SR_WasmDecoder : public WasmDecoder { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 364 | public: |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 365 | SR_WasmDecoder(Zone* zone, TFBuilder* builder, FunctionBody& body) |
| 366 | : WasmDecoder(body.module, body.sig, body.start, body.end), |
| 367 | zone_(zone), |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 368 | builder_(builder), |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 369 | base_(body.base), |
| 370 | local_type_vec_(zone), |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 371 | trees_(zone), |
| 372 | stack_(zone), |
| 373 | blocks_(zone), |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 374 | ifs_(zone) { |
| 375 | local_types_ = &local_type_vec_; |
| 376 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 377 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 378 | TreeResult Decode() { |
| 379 | if (end_ < pc_) { |
| 380 | error(pc_, "function body end < start"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 381 | return result_; |
| 382 | } |
| 383 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 384 | DecodeLocalDecls(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 385 | InitSsaEnv(); |
| 386 | DecodeFunctionBody(); |
| 387 | |
| 388 | Tree* tree = nullptr; |
| 389 | if (ok()) { |
| 390 | if (ssa_env_->go()) { |
| 391 | if (stack_.size() > 0) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 392 | error(stack_.back().pc(), end_, "fell off end of code"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 393 | } |
| 394 | AddImplicitReturnAtEnd(); |
| 395 | } |
| 396 | if (trees_.size() == 0) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 397 | if (sig_->return_count() > 0) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 398 | error(start_, "no trees created"); |
| 399 | } |
| 400 | } else { |
| 401 | tree = trees_[0]; |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | if (ok()) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 406 | TRACE("wasm-decode ok\n"); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 407 | } else { |
| 408 | TRACE("wasm-error module+%-6d func+%d: %s\n\n", baserel(error_pc_), |
| 409 | startrel(error_pc_), error_msg_.get()); |
| 410 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 411 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 412 | return toResult(tree); |
| 413 | } |
| 414 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 415 | bool DecodeLocalDecls(AstLocalDecls& decls) { |
| 416 | DecodeLocalDecls(); |
| 417 | if (failed()) return false; |
| 418 | decls.decls_encoded_size = pc_offset(); |
| 419 | decls.total_local_count = 0; |
| 420 | decls.local_types.reserve(local_type_vec_.size()); |
| 421 | for (size_t pos = 0; pos < local_type_vec_.size();) { |
| 422 | uint32_t count = 0; |
| 423 | LocalType type = local_type_vec_[pos]; |
| 424 | while (pos < local_type_vec_.size() && local_type_vec_[pos] == type) { |
| 425 | pos++; |
| 426 | count++; |
| 427 | } |
| 428 | decls.total_local_count += count; |
| 429 | decls.local_types.push_back(std::pair<LocalType, uint32_t>(type, count)); |
| 430 | } |
| 431 | return true; |
| 432 | } |
| 433 | |
| 434 | BitVector* AnalyzeLoopAssignmentForTesting(const byte* pc, |
| 435 | size_t num_locals) { |
| 436 | total_locals_ = num_locals; |
| 437 | local_type_vec_.reserve(num_locals); |
| 438 | if (num_locals > local_type_vec_.size()) { |
| 439 | local_type_vec_.insert(local_type_vec_.end(), |
| 440 | num_locals - local_type_vec_.size(), kAstI32); |
| 441 | } |
| 442 | return AnalyzeLoopAssignment(pc); |
| 443 | } |
| 444 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 445 | private: |
| 446 | static const size_t kErrorMsgSize = 128; |
| 447 | |
| 448 | Zone* zone_; |
| 449 | TFBuilder* builder_; |
| 450 | const byte* base_; |
| 451 | TreeResult result_; |
| 452 | |
| 453 | SsaEnv* ssa_env_; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 454 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 455 | ZoneVector<LocalType> local_type_vec_; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 456 | ZoneVector<Tree*> trees_; |
| 457 | ZoneVector<Production> stack_; |
| 458 | ZoneVector<Block> blocks_; |
| 459 | ZoneVector<IfEnv> ifs_; |
| 460 | |
| 461 | inline bool build() { return builder_ && ssa_env_->go(); } |
| 462 | |
| 463 | void InitSsaEnv() { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 464 | TFNode* start = nullptr; |
| 465 | SsaEnv* ssa_env = reinterpret_cast<SsaEnv*>(zone_->New(sizeof(SsaEnv))); |
| 466 | size_t size = sizeof(TFNode*) * EnvironmentCount(); |
| 467 | ssa_env->state = SsaEnv::kReached; |
| 468 | ssa_env->locals = |
| 469 | size > 0 ? reinterpret_cast<TFNode**>(zone_->New(size)) : nullptr; |
| 470 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 471 | if (builder_) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 472 | start = builder_->Start(static_cast<int>(sig_->parameter_count() + 1)); |
| 473 | // Initialize local variables. |
| 474 | uint32_t index = 0; |
| 475 | while (index < sig_->parameter_count()) { |
| 476 | ssa_env->locals[index] = builder_->Param(index, local_type_vec_[index]); |
| 477 | index++; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 478 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 479 | while (index < local_type_vec_.size()) { |
| 480 | LocalType type = local_type_vec_[index]; |
| 481 | TFNode* node = DefaultValue(type); |
| 482 | while (index < local_type_vec_.size() && |
| 483 | local_type_vec_[index] == type) { |
| 484 | // Do a whole run of like-typed locals at a time. |
| 485 | ssa_env->locals[index++] = node; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 486 | } |
| 487 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 488 | builder_->set_module(module_); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 489 | } |
| 490 | ssa_env->control = start; |
| 491 | ssa_env->effect = start; |
| 492 | SetEnv("initial", ssa_env); |
| 493 | } |
| 494 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 495 | TFNode* DefaultValue(LocalType type) { |
| 496 | switch (type) { |
| 497 | case kAstI32: |
| 498 | return builder_->Int32Constant(0); |
| 499 | case kAstI64: |
| 500 | return builder_->Int64Constant(0); |
| 501 | case kAstF32: |
| 502 | return builder_->Float32Constant(0); |
| 503 | case kAstF64: |
| 504 | return builder_->Float64Constant(0); |
| 505 | default: |
| 506 | UNREACHABLE(); |
| 507 | return nullptr; |
| 508 | } |
| 509 | } |
| 510 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 511 | void Leaf(LocalType type, TFNode* node = nullptr) { |
| 512 | size_t size = sizeof(Tree); |
| 513 | Tree* tree = reinterpret_cast<Tree*>(zone_->New(size)); |
| 514 | tree->type = type; |
| 515 | tree->count = 0; |
| 516 | tree->pc = pc_; |
| 517 | tree->node = node; |
| 518 | tree->children[0] = nullptr; |
| 519 | Reduce(tree); |
| 520 | } |
| 521 | |
| 522 | void Shift(LocalType type, uint32_t count) { |
| 523 | size_t size = |
| 524 | sizeof(Tree) + (count == 0 ? 0 : ((count - 1) * sizeof(Tree*))); |
| 525 | Tree* tree = reinterpret_cast<Tree*>(zone_->New(size)); |
| 526 | tree->type = type; |
| 527 | tree->count = count; |
| 528 | tree->pc = pc_; |
| 529 | tree->node = nullptr; |
| 530 | for (uint32_t i = 0; i < count; i++) tree->children[i] = nullptr; |
| 531 | if (count == 0) { |
| 532 | Production p = {tree, 0}; |
| 533 | Reduce(&p); |
| 534 | Reduce(tree); |
| 535 | } else { |
| 536 | stack_.push_back({tree, 0}); |
| 537 | } |
| 538 | } |
| 539 | |
| 540 | void Reduce(Tree* tree) { |
| 541 | while (true) { |
| 542 | if (stack_.size() == 0) { |
| 543 | trees_.push_back(tree); |
| 544 | break; |
| 545 | } |
| 546 | Production* p = &stack_.back(); |
| 547 | p->tree->children[p->index++] = tree; |
| 548 | Reduce(p); |
| 549 | if (p->done()) { |
| 550 | tree = p->tree; |
| 551 | stack_.pop_back(); |
| 552 | } else { |
| 553 | break; |
| 554 | } |
| 555 | } |
| 556 | } |
| 557 | |
| 558 | char* indentation() { |
| 559 | static const int kMaxIndent = 64; |
| 560 | static char bytes[kMaxIndent + 1]; |
| 561 | for (int i = 0; i < kMaxIndent; i++) bytes[i] = ' '; |
| 562 | bytes[kMaxIndent] = 0; |
| 563 | if (stack_.size() < kMaxIndent / 2) { |
| 564 | bytes[stack_.size() * 2] = 0; |
| 565 | } |
| 566 | return bytes; |
| 567 | } |
| 568 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 569 | // Decodes the locals declarations, if any, populating {local_type_vec_}. |
| 570 | void DecodeLocalDecls() { |
| 571 | DCHECK_EQ(0, local_type_vec_.size()); |
| 572 | // Initialize {local_type_vec} from signature. |
| 573 | if (sig_) { |
| 574 | local_type_vec_.reserve(sig_->parameter_count()); |
| 575 | for (size_t i = 0; i < sig_->parameter_count(); i++) { |
| 576 | local_type_vec_.push_back(sig_->GetParam(i)); |
| 577 | } |
| 578 | } |
| 579 | // Decode local declarations, if any. |
| 580 | int length; |
| 581 | uint32_t entries = consume_u32v(&length, "local decls count"); |
| 582 | while (entries-- > 0 && pc_ < limit_) { |
| 583 | uint32_t count = consume_u32v(&length, "local count"); |
| 584 | byte code = consume_u8("local type"); |
| 585 | LocalType type; |
| 586 | switch (code) { |
| 587 | case kLocalI32: |
| 588 | type = kAstI32; |
| 589 | break; |
| 590 | case kLocalI64: |
| 591 | type = kAstI64; |
| 592 | break; |
| 593 | case kLocalF32: |
| 594 | type = kAstF32; |
| 595 | break; |
| 596 | case kLocalF64: |
| 597 | type = kAstF64; |
| 598 | break; |
| 599 | default: |
| 600 | error(pc_ - 1, "invalid local type"); |
| 601 | return; |
| 602 | } |
| 603 | local_type_vec_.insert(local_type_vec_.end(), count, type); |
| 604 | } |
| 605 | total_locals_ = local_type_vec_.size(); |
| 606 | } |
| 607 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 608 | // Decodes the body of a function, producing reduced trees into {result}. |
| 609 | void DecodeFunctionBody() { |
| 610 | TRACE("wasm-decode %p...%p (%d bytes) %s\n", |
| 611 | reinterpret_cast<const void*>(start_), |
| 612 | reinterpret_cast<const void*>(limit_), |
| 613 | static_cast<int>(limit_ - start_), builder_ ? "graph building" : ""); |
| 614 | |
| 615 | if (pc_ >= limit_) return; // Nothing to do. |
| 616 | |
| 617 | while (true) { // decoding loop. |
| 618 | int len = 1; |
| 619 | WasmOpcode opcode = static_cast<WasmOpcode>(*pc_); |
| 620 | TRACE("wasm-decode module+%-6d %s func+%d: 0x%02x %s\n", baserel(pc_), |
| 621 | indentation(), startrel(pc_), opcode, |
| 622 | WasmOpcodes::OpcodeName(opcode)); |
| 623 | |
| 624 | FunctionSig* sig = WasmOpcodes::Signature(opcode); |
| 625 | if (sig) { |
| 626 | // A simple expression with a fixed signature. |
| 627 | Shift(sig->GetReturn(), static_cast<uint32_t>(sig->parameter_count())); |
| 628 | pc_ += len; |
| 629 | if (pc_ >= limit_) { |
| 630 | // End of code reached or exceeded. |
| 631 | if (pc_ > limit_ && ok()) { |
| 632 | error("Beyond end of code"); |
| 633 | } |
| 634 | return; |
| 635 | } |
| 636 | continue; // back to decoding loop. |
| 637 | } |
| 638 | |
| 639 | switch (opcode) { |
| 640 | case kExprNop: |
| 641 | Leaf(kAstStmt); |
| 642 | break; |
| 643 | case kExprBlock: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 644 | BlockCountOperand operand(this, pc_); |
| 645 | if (operand.count < 1) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 646 | Leaf(kAstStmt); |
| 647 | } else { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 648 | Shift(kAstEnd, operand.count); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 649 | // The break environment is the outer environment. |
| 650 | SsaEnv* break_env = ssa_env_; |
| 651 | PushBlock(break_env); |
| 652 | SetEnv("block:start", Steal(break_env)); |
| 653 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 654 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 655 | break; |
| 656 | } |
| 657 | case kExprLoop: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 658 | BlockCountOperand operand(this, pc_); |
| 659 | if (operand.count < 1) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 660 | Leaf(kAstStmt); |
| 661 | } else { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 662 | Shift(kAstEnd, operand.count); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 663 | // The break environment is the outer environment. |
| 664 | SsaEnv* break_env = ssa_env_; |
| 665 | PushBlock(break_env); |
| 666 | SsaEnv* cont_env = Steal(break_env); |
| 667 | // The continue environment is the inner environment. |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 668 | PrepareForLoop(pc_, cont_env); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 669 | SetEnv("loop:start", Split(cont_env)); |
| 670 | if (ssa_env_->go()) ssa_env_->state = SsaEnv::kReached; |
| 671 | PushBlock(cont_env); |
| 672 | blocks_.back().stack_depth = -1; // no production for inner block. |
| 673 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 674 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 675 | break; |
| 676 | } |
| 677 | case kExprIf: |
| 678 | Shift(kAstStmt, 2); |
| 679 | break; |
| 680 | case kExprIfElse: |
| 681 | Shift(kAstEnd, 3); // Result type is typeof(x) in {c ? x : y}. |
| 682 | break; |
| 683 | case kExprSelect: |
| 684 | Shift(kAstStmt, 3); // Result type is typeof(x) in {c ? x : y}. |
| 685 | break; |
| 686 | case kExprBr: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 687 | BreakDepthOperand operand(this, pc_); |
| 688 | if (Validate(pc_, operand, blocks_)) { |
| 689 | Shift(kAstEnd, 1); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 690 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 691 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 692 | break; |
| 693 | } |
| 694 | case kExprBrIf: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 695 | BreakDepthOperand operand(this, pc_); |
| 696 | if (Validate(pc_, operand, blocks_)) { |
| 697 | Shift(kAstStmt, 2); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 698 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 699 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 700 | break; |
| 701 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 702 | case kExprBrTable: { |
| 703 | BranchTableOperand operand(this, pc_); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 704 | if (Validate(pc_, operand, blocks_.size())) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 705 | Shift(kAstEnd, 1); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 706 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 707 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 708 | break; |
| 709 | } |
| 710 | case kExprReturn: { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 711 | int count = static_cast<int>(sig_->return_count()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 712 | if (count == 0) { |
| 713 | BUILD(Return, 0, builder_->Buffer(0)); |
| 714 | ssa_env_->Kill(); |
| 715 | Leaf(kAstEnd); |
| 716 | } else { |
| 717 | Shift(kAstEnd, count); |
| 718 | } |
| 719 | break; |
| 720 | } |
| 721 | case kExprUnreachable: { |
| 722 | BUILD0(Unreachable); |
| 723 | ssa_env_->Kill(SsaEnv::kControlEnd); |
| 724 | Leaf(kAstEnd, nullptr); |
| 725 | break; |
| 726 | } |
| 727 | case kExprI8Const: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 728 | ImmI8Operand operand(this, pc_); |
| 729 | Leaf(kAstI32, BUILD(Int32Constant, operand.value)); |
| 730 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 731 | break; |
| 732 | } |
| 733 | case kExprI32Const: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 734 | ImmI32Operand operand(this, pc_); |
| 735 | Leaf(kAstI32, BUILD(Int32Constant, operand.value)); |
| 736 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 737 | break; |
| 738 | } |
| 739 | case kExprI64Const: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 740 | ImmI64Operand operand(this, pc_); |
| 741 | Leaf(kAstI64, BUILD(Int64Constant, operand.value)); |
| 742 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 743 | break; |
| 744 | } |
| 745 | case kExprF32Const: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 746 | ImmF32Operand operand(this, pc_); |
| 747 | Leaf(kAstF32, BUILD(Float32Constant, operand.value)); |
| 748 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 749 | break; |
| 750 | } |
| 751 | case kExprF64Const: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 752 | ImmF64Operand operand(this, pc_); |
| 753 | Leaf(kAstF64, BUILD(Float64Constant, operand.value)); |
| 754 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 755 | break; |
| 756 | } |
| 757 | case kExprGetLocal: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 758 | LocalIndexOperand operand(this, pc_); |
| 759 | if (Validate(pc_, operand)) { |
| 760 | TFNode* val = build() ? ssa_env_->locals[operand.index] : nullptr; |
| 761 | Leaf(operand.type, val); |
| 762 | } |
| 763 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 764 | break; |
| 765 | } |
| 766 | case kExprSetLocal: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 767 | LocalIndexOperand operand(this, pc_); |
| 768 | if (Validate(pc_, operand)) { |
| 769 | Shift(operand.type, 1); |
| 770 | } |
| 771 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 772 | break; |
| 773 | } |
| 774 | case kExprLoadGlobal: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 775 | GlobalIndexOperand operand(this, pc_); |
| 776 | if (Validate(pc_, operand)) { |
| 777 | Leaf(operand.type, BUILD(LoadGlobal, operand.index)); |
| 778 | } |
| 779 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 780 | break; |
| 781 | } |
| 782 | case kExprStoreGlobal: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 783 | GlobalIndexOperand operand(this, pc_); |
| 784 | if (Validate(pc_, operand)) { |
| 785 | Shift(operand.type, 1); |
| 786 | } |
| 787 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 788 | break; |
| 789 | } |
| 790 | case kExprI32LoadMem8S: |
| 791 | case kExprI32LoadMem8U: |
| 792 | case kExprI32LoadMem16S: |
| 793 | case kExprI32LoadMem16U: |
| 794 | case kExprI32LoadMem: |
| 795 | len = DecodeLoadMem(pc_, kAstI32); |
| 796 | break; |
| 797 | case kExprI64LoadMem8S: |
| 798 | case kExprI64LoadMem8U: |
| 799 | case kExprI64LoadMem16S: |
| 800 | case kExprI64LoadMem16U: |
| 801 | case kExprI64LoadMem32S: |
| 802 | case kExprI64LoadMem32U: |
| 803 | case kExprI64LoadMem: |
| 804 | len = DecodeLoadMem(pc_, kAstI64); |
| 805 | break; |
| 806 | case kExprF32LoadMem: |
| 807 | len = DecodeLoadMem(pc_, kAstF32); |
| 808 | break; |
| 809 | case kExprF64LoadMem: |
| 810 | len = DecodeLoadMem(pc_, kAstF64); |
| 811 | break; |
| 812 | case kExprI32StoreMem8: |
| 813 | case kExprI32StoreMem16: |
| 814 | case kExprI32StoreMem: |
| 815 | len = DecodeStoreMem(pc_, kAstI32); |
| 816 | break; |
| 817 | case kExprI64StoreMem8: |
| 818 | case kExprI64StoreMem16: |
| 819 | case kExprI64StoreMem32: |
| 820 | case kExprI64StoreMem: |
| 821 | len = DecodeStoreMem(pc_, kAstI64); |
| 822 | break; |
| 823 | case kExprF32StoreMem: |
| 824 | len = DecodeStoreMem(pc_, kAstF32); |
| 825 | break; |
| 826 | case kExprF64StoreMem: |
| 827 | len = DecodeStoreMem(pc_, kAstF64); |
| 828 | break; |
| 829 | case kExprMemorySize: |
| 830 | Leaf(kAstI32, BUILD(MemSize, 0)); |
| 831 | break; |
| 832 | case kExprGrowMemory: |
| 833 | Shift(kAstI32, 1); |
| 834 | break; |
| 835 | case kExprCallFunction: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 836 | FunctionIndexOperand operand(this, pc_); |
| 837 | if (Validate(pc_, operand)) { |
| 838 | LocalType type = operand.sig->return_count() == 0 |
| 839 | ? kAstStmt |
| 840 | : operand.sig->GetReturn(); |
| 841 | Shift(type, static_cast<int>(operand.sig->parameter_count())); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 842 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 843 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 844 | break; |
| 845 | } |
| 846 | case kExprCallIndirect: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 847 | SignatureIndexOperand operand(this, pc_); |
| 848 | if (Validate(pc_, operand)) { |
| 849 | LocalType type = operand.sig->return_count() == 0 |
| 850 | ? kAstStmt |
| 851 | : operand.sig->GetReturn(); |
| 852 | Shift(type, static_cast<int>(1 + operand.sig->parameter_count())); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 853 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 854 | len = 1 + operand.length; |
| 855 | break; |
| 856 | } |
| 857 | case kExprCallImport: { |
| 858 | ImportIndexOperand operand(this, pc_); |
| 859 | if (Validate(pc_, operand)) { |
| 860 | LocalType type = operand.sig->return_count() == 0 |
| 861 | ? kAstStmt |
| 862 | : operand.sig->GetReturn(); |
| 863 | Shift(type, static_cast<int>(operand.sig->parameter_count())); |
| 864 | } |
| 865 | len = 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 866 | break; |
| 867 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 868 | case kExprDeclLocals: |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 869 | default: |
| 870 | error("Invalid opcode"); |
| 871 | return; |
| 872 | } |
| 873 | pc_ += len; |
| 874 | if (pc_ >= limit_) { |
| 875 | // End of code reached or exceeded. |
| 876 | if (pc_ > limit_ && ok()) { |
| 877 | error("Beyond end of code"); |
| 878 | } |
| 879 | return; |
| 880 | } |
| 881 | } |
| 882 | } |
| 883 | |
| 884 | void PushBlock(SsaEnv* ssa_env) { |
| 885 | blocks_.push_back({ssa_env, static_cast<int>(stack_.size() - 1)}); |
| 886 | } |
| 887 | |
| 888 | int DecodeLoadMem(const byte* pc, LocalType type) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 889 | MemoryAccessOperand operand(this, pc); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 890 | Shift(type, 1); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 891 | return 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 892 | } |
| 893 | |
| 894 | int DecodeStoreMem(const byte* pc, LocalType type) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 895 | MemoryAccessOperand operand(this, pc); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 896 | Shift(type, 2); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 897 | return 1 + operand.length; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 898 | } |
| 899 | |
| 900 | void AddImplicitReturnAtEnd() { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 901 | int retcount = static_cast<int>(sig_->return_count()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 902 | if (retcount == 0) { |
| 903 | BUILD0(ReturnVoid); |
| 904 | return; |
| 905 | } |
| 906 | |
| 907 | if (static_cast<int>(trees_.size()) < retcount) { |
| 908 | error(limit_, nullptr, |
| 909 | "ImplicitReturn expects %d arguments, only %d remain", retcount, |
| 910 | static_cast<int>(trees_.size())); |
| 911 | return; |
| 912 | } |
| 913 | |
| 914 | TRACE("wasm-decode implicit return of %d args\n", retcount); |
| 915 | |
| 916 | TFNode** buffer = BUILD(Buffer, retcount); |
| 917 | for (int index = 0; index < retcount; index++) { |
| 918 | Tree* tree = trees_[trees_.size() - 1 - index]; |
| 919 | if (buffer) buffer[index] = tree->node; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 920 | LocalType expected = sig_->GetReturn(index); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 921 | if (tree->type != expected) { |
| 922 | error(limit_, tree->pc, |
| 923 | "ImplicitReturn[%d] expected type %s, found %s of type %s", index, |
| 924 | WasmOpcodes::TypeName(expected), |
| 925 | WasmOpcodes::OpcodeName(tree->opcode()), |
| 926 | WasmOpcodes::TypeName(tree->type)); |
| 927 | return; |
| 928 | } |
| 929 | } |
| 930 | |
| 931 | BUILD(Return, retcount, buffer); |
| 932 | } |
| 933 | |
| 934 | int baserel(const byte* ptr) { |
| 935 | return base_ ? static_cast<int>(ptr - base_) : 0; |
| 936 | } |
| 937 | |
| 938 | int startrel(const byte* ptr) { return static_cast<int>(ptr - start_); } |
| 939 | |
| 940 | void Reduce(Production* p) { |
| 941 | WasmOpcode opcode = p->opcode(); |
| 942 | TRACE("-----reduce module+%-6d %s func+%d: 0x%02x %s\n", baserel(p->pc()), |
| 943 | indentation(), startrel(p->pc()), opcode, |
| 944 | WasmOpcodes::OpcodeName(opcode)); |
| 945 | FunctionSig* sig = WasmOpcodes::Signature(opcode); |
| 946 | if (sig) { |
| 947 | // A simple expression with a fixed signature. |
| 948 | TypeCheckLast(p, sig->GetParam(p->index - 1)); |
| 949 | if (p->done() && build()) { |
| 950 | if (sig->parameter_count() == 2) { |
| 951 | p->tree->node = builder_->Binop(opcode, p->tree->children[0]->node, |
| 952 | p->tree->children[1]->node); |
| 953 | } else if (sig->parameter_count() == 1) { |
| 954 | p->tree->node = builder_->Unop(opcode, p->tree->children[0]->node); |
| 955 | } else { |
| 956 | UNREACHABLE(); |
| 957 | } |
| 958 | } |
| 959 | return; |
| 960 | } |
| 961 | |
| 962 | switch (opcode) { |
| 963 | case kExprBlock: { |
| 964 | if (p->done()) { |
| 965 | Block* last = &blocks_.back(); |
| 966 | DCHECK_EQ(stack_.size() - 1, last->stack_depth); |
| 967 | // fallthrough with the last expression. |
| 968 | ReduceBreakToExprBlock(p, last); |
| 969 | SetEnv("block:end", last->ssa_env); |
| 970 | blocks_.pop_back(); |
| 971 | } |
| 972 | break; |
| 973 | } |
| 974 | case kExprLoop: { |
| 975 | if (p->done()) { |
| 976 | // Pop the continue environment. |
| 977 | blocks_.pop_back(); |
| 978 | // Get the break environment. |
| 979 | Block* last = &blocks_.back(); |
| 980 | DCHECK_EQ(stack_.size() - 1, last->stack_depth); |
| 981 | // fallthrough with the last expression. |
| 982 | ReduceBreakToExprBlock(p, last); |
| 983 | SetEnv("loop:end", last->ssa_env); |
| 984 | blocks_.pop_back(); |
| 985 | } |
| 986 | break; |
| 987 | } |
| 988 | case kExprIf: { |
| 989 | if (p->index == 1) { |
| 990 | // Condition done. Split environment for true branch. |
| 991 | TypeCheckLast(p, kAstI32); |
| 992 | SsaEnv* false_env = ssa_env_; |
| 993 | SsaEnv* true_env = Split(ssa_env_); |
| 994 | ifs_.push_back({nullptr, false_env, nullptr}); |
| 995 | BUILD(Branch, p->last()->node, &true_env->control, |
| 996 | &false_env->control); |
| 997 | SetEnv("if:true", true_env); |
| 998 | } else if (p->index == 2) { |
| 999 | // True block done. Merge true and false environments. |
| 1000 | IfEnv* env = &ifs_.back(); |
| 1001 | SsaEnv* merge = env->merge_env; |
| 1002 | if (merge->go()) { |
| 1003 | merge->state = SsaEnv::kReached; |
| 1004 | Goto(ssa_env_, merge); |
| 1005 | } |
| 1006 | SetEnv("if:merge", merge); |
| 1007 | ifs_.pop_back(); |
| 1008 | } |
| 1009 | break; |
| 1010 | } |
| 1011 | case kExprIfElse: { |
| 1012 | if (p->index == 1) { |
| 1013 | // Condition done. Split environment for true and false branches. |
| 1014 | TypeCheckLast(p, kAstI32); |
| 1015 | SsaEnv* merge_env = ssa_env_; |
| 1016 | TFNode* if_true = nullptr; |
| 1017 | TFNode* if_false = nullptr; |
| 1018 | BUILD(Branch, p->last()->node, &if_true, &if_false); |
| 1019 | SsaEnv* false_env = Split(ssa_env_); |
| 1020 | SsaEnv* true_env = Steal(ssa_env_); |
| 1021 | false_env->control = if_false; |
| 1022 | true_env->control = if_true; |
| 1023 | ifs_.push_back({false_env, merge_env, nullptr}); |
| 1024 | SetEnv("if_else:true", true_env); |
| 1025 | } else if (p->index == 2) { |
| 1026 | // True expr done. |
| 1027 | IfEnv* env = &ifs_.back(); |
| 1028 | MergeIntoProduction(p, env->merge_env, p->last()); |
| 1029 | // Switch to environment for false branch. |
| 1030 | SsaEnv* false_env = ifs_.back().false_env; |
| 1031 | SetEnv("if_else:false", false_env); |
| 1032 | } else if (p->index == 3) { |
| 1033 | // False expr done. |
| 1034 | IfEnv* env = &ifs_.back(); |
| 1035 | MergeIntoProduction(p, env->merge_env, p->last()); |
| 1036 | SetEnv("if_else:merge", env->merge_env); |
| 1037 | ifs_.pop_back(); |
| 1038 | } |
| 1039 | break; |
| 1040 | } |
| 1041 | case kExprSelect: { |
| 1042 | if (p->index == 1) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1043 | // True expression done. |
| 1044 | p->tree->type = p->last()->type; |
| 1045 | if (p->tree->type == kAstStmt) { |
| 1046 | error(p->pc(), p->tree->children[1]->pc, |
| 1047 | "select operand should be expression"); |
| 1048 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1049 | } else if (p->index == 2) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1050 | // False expression done. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1051 | TypeCheckLast(p, p->tree->type); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1052 | } else { |
| 1053 | // Condition done. |
| 1054 | DCHECK(p->done()); |
| 1055 | TypeCheckLast(p, kAstI32); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1056 | if (build()) { |
| 1057 | TFNode* controls[2]; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1058 | builder_->Branch(p->tree->children[2]->node, &controls[0], |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1059 | &controls[1]); |
| 1060 | TFNode* merge = builder_->Merge(2, controls); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1061 | TFNode* vals[2] = {p->tree->children[0]->node, |
| 1062 | p->tree->children[1]->node}; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1063 | TFNode* phi = builder_->Phi(p->tree->type, 2, vals, merge); |
| 1064 | p->tree->node = phi; |
| 1065 | ssa_env_->control = merge; |
| 1066 | } |
| 1067 | } |
| 1068 | break; |
| 1069 | } |
| 1070 | case kExprBr: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1071 | BreakDepthOperand operand(this, p->pc()); |
| 1072 | CHECK(Validate(p->pc(), operand, blocks_)); |
| 1073 | ReduceBreakToExprBlock(p, operand.target); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1074 | break; |
| 1075 | } |
| 1076 | case kExprBrIf: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1077 | if (p->done()) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1078 | TypeCheckLast(p, kAstI32); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1079 | BreakDepthOperand operand(this, p->pc()); |
| 1080 | CHECK(Validate(p->pc(), operand, blocks_)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1081 | SsaEnv* fenv = ssa_env_; |
| 1082 | SsaEnv* tenv = Split(fenv); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1083 | BUILD(Branch, p->tree->children[1]->node, &tenv->control, |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1084 | &fenv->control); |
| 1085 | ssa_env_ = tenv; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1086 | ReduceBreakToExprBlock(p, operand.target, p->tree->children[0]); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1087 | ssa_env_ = fenv; |
| 1088 | } |
| 1089 | break; |
| 1090 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1091 | case kExprBrTable: { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1092 | if (p->index == 1) { |
| 1093 | // Switch key finished. |
| 1094 | TypeCheckLast(p, kAstI32); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1095 | if (failed()) break; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1096 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1097 | BranchTableOperand operand(this, p->pc()); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1098 | DCHECK(Validate(p->pc(), operand, blocks_.size())); |
| 1099 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1100 | // Build a switch only if it has more than just a default target. |
| 1101 | bool build_switch = operand.table_count > 0; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1102 | TFNode* sw = nullptr; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1103 | if (build_switch) { |
| 1104 | sw = BUILD(Switch, operand.table_count + 1, p->last()->node); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1105 | } |
| 1106 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1107 | // Process the targets of the break table. |
| 1108 | SsaEnv* prev = ssa_env_; |
| 1109 | SsaEnv* copy = Steal(prev); |
| 1110 | for (uint32_t i = 0; i < operand.table_count + 1; i++) { |
| 1111 | uint32_t target = operand.read_entry(this, i); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1112 | SsaEnv* env = copy; |
| 1113 | if (build_switch) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1114 | ssa_env_ = env = Split(env); |
| 1115 | env->control = i == operand.table_count ? BUILD(IfDefault, sw) |
| 1116 | : BUILD(IfValue, i, sw); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1117 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1118 | SsaEnv* tenv = blocks_[blocks_.size() - target - 1].ssa_env; |
| 1119 | Goto(env, tenv); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1120 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1121 | ssa_env_ = prev; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1122 | } |
| 1123 | break; |
| 1124 | } |
| 1125 | case kExprReturn: { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1126 | TypeCheckLast(p, sig_->GetReturn(p->index - 1)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1127 | if (p->done()) { |
| 1128 | if (build()) { |
| 1129 | int count = p->tree->count; |
| 1130 | TFNode** buffer = builder_->Buffer(count); |
| 1131 | for (int i = 0; i < count; i++) { |
| 1132 | buffer[i] = p->tree->children[i]->node; |
| 1133 | } |
| 1134 | BUILD(Return, count, buffer); |
| 1135 | } |
| 1136 | ssa_env_->Kill(SsaEnv::kControlEnd); |
| 1137 | } |
| 1138 | break; |
| 1139 | } |
| 1140 | case kExprSetLocal: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1141 | LocalIndexOperand operand(this, p->pc()); |
| 1142 | CHECK(Validate(p->pc(), operand)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1143 | Tree* val = p->last(); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1144 | if (operand.type == val->type) { |
| 1145 | if (build()) ssa_env_->locals[operand.index] = val->node; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1146 | p->tree->node = val->node; |
| 1147 | } else { |
| 1148 | error(p->pc(), val->pc, "Typecheck failed in SetLocal"); |
| 1149 | } |
| 1150 | break; |
| 1151 | } |
| 1152 | case kExprStoreGlobal: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1153 | GlobalIndexOperand operand(this, p->pc()); |
| 1154 | CHECK(Validate(p->pc(), operand)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1155 | Tree* val = p->last(); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1156 | if (operand.type == val->type) { |
| 1157 | BUILD(StoreGlobal, operand.index, val->node); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1158 | p->tree->node = val->node; |
| 1159 | } else { |
| 1160 | error(p->pc(), val->pc, "Typecheck failed in StoreGlobal"); |
| 1161 | } |
| 1162 | break; |
| 1163 | } |
| 1164 | |
| 1165 | case kExprI32LoadMem8S: |
| 1166 | return ReduceLoadMem(p, kAstI32, MachineType::Int8()); |
| 1167 | case kExprI32LoadMem8U: |
| 1168 | return ReduceLoadMem(p, kAstI32, MachineType::Uint8()); |
| 1169 | case kExprI32LoadMem16S: |
| 1170 | return ReduceLoadMem(p, kAstI32, MachineType::Int16()); |
| 1171 | case kExprI32LoadMem16U: |
| 1172 | return ReduceLoadMem(p, kAstI32, MachineType::Uint16()); |
| 1173 | case kExprI32LoadMem: |
| 1174 | return ReduceLoadMem(p, kAstI32, MachineType::Int32()); |
| 1175 | |
| 1176 | case kExprI64LoadMem8S: |
| 1177 | return ReduceLoadMem(p, kAstI64, MachineType::Int8()); |
| 1178 | case kExprI64LoadMem8U: |
| 1179 | return ReduceLoadMem(p, kAstI64, MachineType::Uint8()); |
| 1180 | case kExprI64LoadMem16S: |
| 1181 | return ReduceLoadMem(p, kAstI64, MachineType::Int16()); |
| 1182 | case kExprI64LoadMem16U: |
| 1183 | return ReduceLoadMem(p, kAstI64, MachineType::Uint16()); |
| 1184 | case kExprI64LoadMem32S: |
| 1185 | return ReduceLoadMem(p, kAstI64, MachineType::Int32()); |
| 1186 | case kExprI64LoadMem32U: |
| 1187 | return ReduceLoadMem(p, kAstI64, MachineType::Uint32()); |
| 1188 | case kExprI64LoadMem: |
| 1189 | return ReduceLoadMem(p, kAstI64, MachineType::Int64()); |
| 1190 | |
| 1191 | case kExprF32LoadMem: |
| 1192 | return ReduceLoadMem(p, kAstF32, MachineType::Float32()); |
| 1193 | |
| 1194 | case kExprF64LoadMem: |
| 1195 | return ReduceLoadMem(p, kAstF64, MachineType::Float64()); |
| 1196 | |
| 1197 | case kExprI32StoreMem8: |
| 1198 | return ReduceStoreMem(p, kAstI32, MachineType::Int8()); |
| 1199 | case kExprI32StoreMem16: |
| 1200 | return ReduceStoreMem(p, kAstI32, MachineType::Int16()); |
| 1201 | case kExprI32StoreMem: |
| 1202 | return ReduceStoreMem(p, kAstI32, MachineType::Int32()); |
| 1203 | |
| 1204 | case kExprI64StoreMem8: |
| 1205 | return ReduceStoreMem(p, kAstI64, MachineType::Int8()); |
| 1206 | case kExprI64StoreMem16: |
| 1207 | return ReduceStoreMem(p, kAstI64, MachineType::Int16()); |
| 1208 | case kExprI64StoreMem32: |
| 1209 | return ReduceStoreMem(p, kAstI64, MachineType::Int32()); |
| 1210 | case kExprI64StoreMem: |
| 1211 | return ReduceStoreMem(p, kAstI64, MachineType::Int64()); |
| 1212 | |
| 1213 | case kExprF32StoreMem: |
| 1214 | return ReduceStoreMem(p, kAstF32, MachineType::Float32()); |
| 1215 | |
| 1216 | case kExprF64StoreMem: |
| 1217 | return ReduceStoreMem(p, kAstF64, MachineType::Float64()); |
| 1218 | |
| 1219 | case kExprGrowMemory: |
| 1220 | TypeCheckLast(p, kAstI32); |
| 1221 | // TODO(titzer): build node for GrowMemory |
| 1222 | p->tree->node = BUILD(Int32Constant, 0); |
| 1223 | return; |
| 1224 | |
| 1225 | case kExprCallFunction: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1226 | FunctionIndexOperand operand(this, p->pc()); |
| 1227 | CHECK(Validate(p->pc(), operand)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1228 | if (p->index > 0) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1229 | TypeCheckLast(p, operand.sig->GetParam(p->index - 1)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1230 | } |
| 1231 | if (p->done() && build()) { |
| 1232 | uint32_t count = p->tree->count + 1; |
| 1233 | TFNode** buffer = builder_->Buffer(count); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1234 | buffer[0] = nullptr; // reserved for code object. |
| 1235 | for (uint32_t i = 1; i < count; i++) { |
| 1236 | buffer[i] = p->tree->children[i - 1]->node; |
| 1237 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1238 | p->tree->node = builder_->CallDirect(operand.index, buffer); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1239 | } |
| 1240 | break; |
| 1241 | } |
| 1242 | case kExprCallIndirect: { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1243 | SignatureIndexOperand operand(this, p->pc()); |
| 1244 | CHECK(Validate(p->pc(), operand)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1245 | if (p->index == 1) { |
| 1246 | TypeCheckLast(p, kAstI32); |
| 1247 | } else { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1248 | TypeCheckLast(p, operand.sig->GetParam(p->index - 2)); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1249 | } |
| 1250 | if (p->done() && build()) { |
| 1251 | uint32_t count = p->tree->count; |
| 1252 | TFNode** buffer = builder_->Buffer(count); |
| 1253 | for (uint32_t i = 0; i < count; i++) { |
| 1254 | buffer[i] = p->tree->children[i]->node; |
| 1255 | } |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1256 | p->tree->node = builder_->CallIndirect(operand.index, buffer); |
| 1257 | } |
| 1258 | break; |
| 1259 | } |
| 1260 | case kExprCallImport: { |
| 1261 | ImportIndexOperand operand(this, p->pc()); |
| 1262 | CHECK(Validate(p->pc(), operand)); |
| 1263 | if (p->index > 0) { |
| 1264 | TypeCheckLast(p, operand.sig->GetParam(p->index - 1)); |
| 1265 | } |
| 1266 | if (p->done() && build()) { |
| 1267 | uint32_t count = p->tree->count + 1; |
| 1268 | TFNode** buffer = builder_->Buffer(count); |
| 1269 | buffer[0] = nullptr; // reserved for code object. |
| 1270 | for (uint32_t i = 1; i < count; i++) { |
| 1271 | buffer[i] = p->tree->children[i - 1]->node; |
| 1272 | } |
| 1273 | p->tree->node = builder_->CallImport(operand.index, buffer); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1274 | } |
| 1275 | break; |
| 1276 | } |
| 1277 | default: |
| 1278 | break; |
| 1279 | } |
| 1280 | } |
| 1281 | |
| 1282 | void ReduceBreakToExprBlock(Production* p, Block* block) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1283 | ReduceBreakToExprBlock(p, block, p->tree->count > 0 ? p->last() : nullptr); |
| 1284 | } |
| 1285 | |
| 1286 | void ReduceBreakToExprBlock(Production* p, Block* block, Tree* val) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1287 | if (block->stack_depth < 0) { |
| 1288 | // This is the inner loop block, which does not have a value. |
| 1289 | Goto(ssa_env_, block->ssa_env); |
| 1290 | } else { |
| 1291 | // Merge the value into the production for the block. |
| 1292 | Production* bp = &stack_[block->stack_depth]; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1293 | MergeIntoProduction(bp, block->ssa_env, val); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1294 | } |
| 1295 | } |
| 1296 | |
| 1297 | void MergeIntoProduction(Production* p, SsaEnv* target, Tree* expr) { |
| 1298 | if (!ssa_env_->go()) return; |
| 1299 | |
| 1300 | bool first = target->state == SsaEnv::kUnreachable; |
| 1301 | Goto(ssa_env_, target); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1302 | if (expr == nullptr || expr->type == kAstEnd) return; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1303 | |
| 1304 | if (first) { |
| 1305 | // first merge to this environment; set the type and the node. |
| 1306 | p->tree->type = expr->type; |
| 1307 | p->tree->node = expr->node; |
| 1308 | } else { |
| 1309 | // merge with the existing value for this block. |
| 1310 | LocalType type = p->tree->type; |
| 1311 | if (expr->type != type) { |
| 1312 | type = kAstStmt; |
| 1313 | p->tree->type = kAstStmt; |
| 1314 | p->tree->node = nullptr; |
| 1315 | } else if (type != kAstStmt) { |
| 1316 | p->tree->node = CreateOrMergeIntoPhi(type, target->control, |
| 1317 | p->tree->node, expr->node); |
| 1318 | } |
| 1319 | } |
| 1320 | } |
| 1321 | |
| 1322 | void ReduceLoadMem(Production* p, LocalType type, MachineType mem_type) { |
| 1323 | DCHECK_EQ(1, p->index); |
| 1324 | TypeCheckLast(p, kAstI32); // index |
| 1325 | if (build()) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1326 | MemoryAccessOperand operand(this, p->pc()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1327 | p->tree->node = |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1328 | builder_->LoadMem(type, mem_type, p->last()->node, operand.offset); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1329 | } |
| 1330 | } |
| 1331 | |
| 1332 | void ReduceStoreMem(Production* p, LocalType type, MachineType mem_type) { |
| 1333 | if (p->index == 1) { |
| 1334 | TypeCheckLast(p, kAstI32); // index |
| 1335 | } else { |
| 1336 | DCHECK_EQ(2, p->index); |
| 1337 | TypeCheckLast(p, type); |
| 1338 | if (build()) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1339 | MemoryAccessOperand operand(this, p->pc()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1340 | TFNode* val = p->tree->children[1]->node; |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1341 | builder_->StoreMem(mem_type, p->tree->children[0]->node, operand.offset, |
| 1342 | val); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1343 | p->tree->node = val; |
| 1344 | } |
| 1345 | } |
| 1346 | } |
| 1347 | |
| 1348 | void TypeCheckLast(Production* p, LocalType expected) { |
| 1349 | LocalType result = p->last()->type; |
| 1350 | if (result == expected) return; |
| 1351 | if (result == kAstEnd) return; |
| 1352 | if (expected != kAstStmt) { |
| 1353 | error(p->pc(), p->last()->pc, |
| 1354 | "%s[%d] expected type %s, found %s of type %s", |
| 1355 | WasmOpcodes::OpcodeName(p->opcode()), p->index - 1, |
| 1356 | WasmOpcodes::TypeName(expected), |
| 1357 | WasmOpcodes::OpcodeName(p->last()->opcode()), |
| 1358 | WasmOpcodes::TypeName(p->last()->type)); |
| 1359 | } |
| 1360 | } |
| 1361 | |
| 1362 | void SetEnv(const char* reason, SsaEnv* env) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1363 | #if DEBUG |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1364 | TRACE(" env = %p, block depth = %d, reason = %s", static_cast<void*>(env), |
| 1365 | static_cast<int>(blocks_.size()), reason); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1366 | if (FLAG_trace_wasm_decoder && env && env->control) { |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1367 | TRACE(", control = "); |
| 1368 | compiler::WasmGraphBuilder::PrintDebugName(env->control); |
| 1369 | } |
| 1370 | TRACE("\n"); |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1371 | #endif |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1372 | ssa_env_ = env; |
| 1373 | if (builder_) { |
| 1374 | builder_->set_control_ptr(&env->control); |
| 1375 | builder_->set_effect_ptr(&env->effect); |
| 1376 | } |
| 1377 | } |
| 1378 | |
| 1379 | void Goto(SsaEnv* from, SsaEnv* to) { |
| 1380 | DCHECK_NOT_NULL(to); |
| 1381 | if (!from->go()) return; |
| 1382 | switch (to->state) { |
| 1383 | case SsaEnv::kUnreachable: { // Overwrite destination. |
| 1384 | to->state = SsaEnv::kReached; |
| 1385 | to->locals = from->locals; |
| 1386 | to->control = from->control; |
| 1387 | to->effect = from->effect; |
| 1388 | break; |
| 1389 | } |
| 1390 | case SsaEnv::kReached: { // Create a new merge. |
| 1391 | to->state = SsaEnv::kMerged; |
| 1392 | if (!builder_) break; |
| 1393 | // Merge control. |
| 1394 | TFNode* controls[] = {to->control, from->control}; |
| 1395 | TFNode* merge = builder_->Merge(2, controls); |
| 1396 | to->control = merge; |
| 1397 | // Merge effects. |
| 1398 | if (from->effect != to->effect) { |
| 1399 | TFNode* effects[] = {to->effect, from->effect, merge}; |
| 1400 | to->effect = builder_->EffectPhi(2, effects, merge); |
| 1401 | } |
| 1402 | // Merge SSA values. |
| 1403 | for (int i = EnvironmentCount() - 1; i >= 0; i--) { |
| 1404 | TFNode* a = to->locals[i]; |
| 1405 | TFNode* b = from->locals[i]; |
| 1406 | if (a != b) { |
| 1407 | TFNode* vals[] = {a, b}; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1408 | to->locals[i] = builder_->Phi(local_type_vec_[i], 2, vals, merge); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1409 | } |
| 1410 | } |
| 1411 | break; |
| 1412 | } |
| 1413 | case SsaEnv::kMerged: { |
| 1414 | if (!builder_) break; |
| 1415 | TFNode* merge = to->control; |
| 1416 | // Extend the existing merge. |
| 1417 | builder_->AppendToMerge(merge, from->control); |
| 1418 | // Merge effects. |
| 1419 | if (builder_->IsPhiWithMerge(to->effect, merge)) { |
| 1420 | builder_->AppendToPhi(merge, to->effect, from->effect); |
| 1421 | } else if (to->effect != from->effect) { |
| 1422 | uint32_t count = builder_->InputCount(merge); |
| 1423 | TFNode** effects = builder_->Buffer(count); |
| 1424 | for (uint32_t j = 0; j < count - 1; j++) { |
| 1425 | effects[j] = to->effect; |
| 1426 | } |
| 1427 | effects[count - 1] = from->effect; |
| 1428 | to->effect = builder_->EffectPhi(count, effects, merge); |
| 1429 | } |
| 1430 | // Merge locals. |
| 1431 | for (int i = EnvironmentCount() - 1; i >= 0; i--) { |
| 1432 | TFNode* tnode = to->locals[i]; |
| 1433 | TFNode* fnode = from->locals[i]; |
| 1434 | if (builder_->IsPhiWithMerge(tnode, merge)) { |
| 1435 | builder_->AppendToPhi(merge, tnode, fnode); |
| 1436 | } else if (tnode != fnode) { |
| 1437 | uint32_t count = builder_->InputCount(merge); |
| 1438 | TFNode** vals = builder_->Buffer(count); |
| 1439 | for (uint32_t j = 0; j < count - 1; j++) { |
| 1440 | vals[j] = tnode; |
| 1441 | } |
| 1442 | vals[count - 1] = fnode; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1443 | to->locals[i] = |
| 1444 | builder_->Phi(local_type_vec_[i], count, vals, merge); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1445 | } |
| 1446 | } |
| 1447 | break; |
| 1448 | } |
| 1449 | default: |
| 1450 | UNREACHABLE(); |
| 1451 | } |
| 1452 | return from->Kill(); |
| 1453 | } |
| 1454 | |
| 1455 | TFNode* CreateOrMergeIntoPhi(LocalType type, TFNode* merge, TFNode* tnode, |
| 1456 | TFNode* fnode) { |
| 1457 | if (builder_->IsPhiWithMerge(tnode, merge)) { |
| 1458 | builder_->AppendToPhi(merge, tnode, fnode); |
| 1459 | } else if (tnode != fnode) { |
| 1460 | uint32_t count = builder_->InputCount(merge); |
| 1461 | TFNode** vals = builder_->Buffer(count); |
| 1462 | for (uint32_t j = 0; j < count - 1; j++) vals[j] = tnode; |
| 1463 | vals[count - 1] = fnode; |
| 1464 | return builder_->Phi(type, count, vals, merge); |
| 1465 | } |
| 1466 | return tnode; |
| 1467 | } |
| 1468 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1469 | void PrepareForLoop(const byte* pc, SsaEnv* env) { |
| 1470 | if (!env->go()) return; |
| 1471 | env->state = SsaEnv::kMerged; |
| 1472 | if (!builder_) return; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1473 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1474 | env->control = builder_->Loop(env->control); |
| 1475 | env->effect = builder_->EffectPhi(1, &env->effect, env->control); |
| 1476 | builder_->Terminate(env->effect, env->control); |
| 1477 | if (FLAG_wasm_loop_assignment_analysis) { |
| 1478 | BitVector* assigned = AnalyzeLoopAssignment(pc); |
| 1479 | if (assigned != nullptr) { |
| 1480 | // Only introduce phis for variables assigned in this loop. |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1481 | for (int i = EnvironmentCount() - 1; i >= 0; i--) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1482 | if (!assigned->Contains(i)) continue; |
| 1483 | env->locals[i] = builder_->Phi(local_type_vec_[i], 1, &env->locals[i], |
| 1484 | env->control); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1485 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1486 | return; |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1487 | } |
| 1488 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1489 | |
| 1490 | // Conservatively introduce phis for all local variables. |
| 1491 | for (int i = EnvironmentCount() - 1; i >= 0; i--) { |
| 1492 | env->locals[i] = |
| 1493 | builder_->Phi(local_type_vec_[i], 1, &env->locals[i], env->control); |
| 1494 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1495 | } |
| 1496 | |
| 1497 | // Create a complete copy of the {from}. |
| 1498 | SsaEnv* Split(SsaEnv* from) { |
| 1499 | DCHECK_NOT_NULL(from); |
| 1500 | SsaEnv* result = reinterpret_cast<SsaEnv*>(zone_->New(sizeof(SsaEnv))); |
| 1501 | size_t size = sizeof(TFNode*) * EnvironmentCount(); |
| 1502 | result->control = from->control; |
| 1503 | result->effect = from->effect; |
| 1504 | result->state = from->state == SsaEnv::kUnreachable ? SsaEnv::kUnreachable |
| 1505 | : SsaEnv::kReached; |
| 1506 | |
| 1507 | if (from->go()) { |
| 1508 | result->state = SsaEnv::kReached; |
| 1509 | result->locals = |
| 1510 | size > 0 ? reinterpret_cast<TFNode**>(zone_->New(size)) : nullptr; |
| 1511 | memcpy(result->locals, from->locals, size); |
| 1512 | } else { |
| 1513 | result->state = SsaEnv::kUnreachable; |
| 1514 | result->locals = nullptr; |
| 1515 | } |
| 1516 | |
| 1517 | return result; |
| 1518 | } |
| 1519 | |
| 1520 | // Create a copy of {from} that steals its state and leaves {from} |
| 1521 | // unreachable. |
| 1522 | SsaEnv* Steal(SsaEnv* from) { |
| 1523 | DCHECK_NOT_NULL(from); |
| 1524 | if (!from->go()) return UnreachableEnv(); |
| 1525 | SsaEnv* result = reinterpret_cast<SsaEnv*>(zone_->New(sizeof(SsaEnv))); |
| 1526 | result->state = SsaEnv::kReached; |
| 1527 | result->locals = from->locals; |
| 1528 | result->control = from->control; |
| 1529 | result->effect = from->effect; |
| 1530 | from->Kill(SsaEnv::kUnreachable); |
| 1531 | return result; |
| 1532 | } |
| 1533 | |
| 1534 | // Create an unreachable environment. |
| 1535 | SsaEnv* UnreachableEnv() { |
| 1536 | SsaEnv* result = reinterpret_cast<SsaEnv*>(zone_->New(sizeof(SsaEnv))); |
| 1537 | result->state = SsaEnv::kUnreachable; |
| 1538 | result->control = nullptr; |
| 1539 | result->effect = nullptr; |
| 1540 | result->locals = nullptr; |
| 1541 | return result; |
| 1542 | } |
| 1543 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1544 | int EnvironmentCount() { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1545 | if (builder_) return static_cast<int>(local_type_vec_.size()); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1546 | return 0; // if we aren't building a graph, don't bother with SSA renaming. |
| 1547 | } |
| 1548 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1549 | virtual void onFirstError() { |
| 1550 | limit_ = start_; // Terminate decoding loop. |
| 1551 | builder_ = nullptr; // Don't build any more nodes. |
| 1552 | #if DEBUG |
| 1553 | PrintStackForDebugging(); |
| 1554 | #endif |
| 1555 | } |
| 1556 | |
| 1557 | #if DEBUG |
| 1558 | void PrintStackForDebugging() { PrintProduction(0); } |
| 1559 | |
| 1560 | void PrintProduction(size_t depth) { |
| 1561 | if (depth >= stack_.size()) return; |
| 1562 | Production* p = &stack_[depth]; |
| 1563 | for (size_t d = 0; d < depth; d++) PrintF(" "); |
| 1564 | |
| 1565 | PrintF("@%d %s [%d]\n", static_cast<int>(p->tree->pc - start_), |
| 1566 | WasmOpcodes::OpcodeName(p->opcode()), p->tree->count); |
| 1567 | for (int i = 0; i < p->index; i++) { |
| 1568 | Tree* child = p->tree->children[i]; |
| 1569 | for (size_t d = 0; d <= depth; d++) PrintF(" "); |
| 1570 | PrintF("@%d %s [%d]", static_cast<int>(child->pc - start_), |
| 1571 | WasmOpcodes::OpcodeName(child->opcode()), child->count); |
| 1572 | if (child->node) { |
| 1573 | PrintF(" => TF"); |
| 1574 | compiler::WasmGraphBuilder::PrintDebugName(child->node); |
| 1575 | } |
| 1576 | PrintF("\n"); |
| 1577 | } |
| 1578 | PrintProduction(depth + 1); |
| 1579 | } |
| 1580 | #endif |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1581 | |
| 1582 | BitVector* AnalyzeLoopAssignment(const byte* pc) { |
| 1583 | if (pc >= limit_) return nullptr; |
| 1584 | if (*pc != kExprLoop) return nullptr; |
| 1585 | |
| 1586 | BitVector* assigned = |
| 1587 | new (zone_) BitVector(static_cast<int>(total_locals_), zone_); |
| 1588 | // Keep a stack to model the nesting of expressions. |
| 1589 | std::vector<int> arity_stack; |
| 1590 | arity_stack.push_back(OpcodeArity(pc)); |
| 1591 | pc += OpcodeLength(pc); |
| 1592 | |
| 1593 | // Iteratively process all AST nodes nested inside the loop. |
| 1594 | while (pc < limit_) { |
| 1595 | WasmOpcode opcode = static_cast<WasmOpcode>(*pc); |
| 1596 | int arity = 0; |
| 1597 | int length = 1; |
| 1598 | int assigned_index = -1; |
| 1599 | if (opcode == kExprSetLocal) { |
| 1600 | LocalIndexOperand operand(this, pc); |
| 1601 | if (assigned->length() > 0 && |
| 1602 | static_cast<int>(operand.index) < assigned->length()) { |
| 1603 | // Unverified code might have an out-of-bounds index. |
| 1604 | // Ignore out-of-bounds indices, as the main verification will fail. |
| 1605 | assigned->Add(operand.index); |
| 1606 | assigned_index = operand.index; |
| 1607 | } |
| 1608 | arity = 1; |
| 1609 | length = 1 + operand.length; |
| 1610 | } else { |
| 1611 | arity = OpcodeArity(pc); |
| 1612 | length = OpcodeLength(pc); |
| 1613 | } |
| 1614 | |
| 1615 | TRACE("loop-assign module+%-6d %s func+%d: 0x%02x %s", baserel(pc), |
| 1616 | indentation(), startrel(pc), opcode, |
| 1617 | WasmOpcodes::OpcodeName(opcode)); |
| 1618 | |
| 1619 | if (assigned_index >= 0) { |
| 1620 | TRACE(" (assigned local #%d)\n", assigned_index); |
| 1621 | } else { |
| 1622 | TRACE("\n"); |
| 1623 | } |
| 1624 | |
| 1625 | pc += length; |
| 1626 | arity_stack.push_back(arity); |
| 1627 | while (arity_stack.back() == 0) { |
| 1628 | arity_stack.pop_back(); |
| 1629 | if (arity_stack.empty()) return assigned; // reached end of loop |
| 1630 | arity_stack.back()--; |
| 1631 | } |
| 1632 | } |
| 1633 | return assigned; |
| 1634 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1635 | }; |
| 1636 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1637 | bool DecodeLocalDecls(AstLocalDecls& decls, const byte* start, |
| 1638 | const byte* end) { |
| 1639 | base::AccountingAllocator allocator; |
| 1640 | Zone tmp(&allocator); |
| 1641 | FunctionBody body = {nullptr, nullptr, nullptr, start, end}; |
| 1642 | SR_WasmDecoder decoder(&tmp, nullptr, body); |
| 1643 | return decoder.DecodeLocalDecls(decls); |
| 1644 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1645 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1646 | TreeResult VerifyWasmCode(base::AccountingAllocator* allocator, |
| 1647 | FunctionBody& body) { |
| 1648 | Zone zone(allocator); |
| 1649 | SR_WasmDecoder decoder(&zone, nullptr, body); |
| 1650 | TreeResult result = decoder.Decode(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1651 | return result; |
| 1652 | } |
| 1653 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1654 | TreeResult BuildTFGraph(base::AccountingAllocator* allocator, |
| 1655 | TFBuilder* builder, FunctionBody& body) { |
| 1656 | Zone zone(allocator); |
| 1657 | SR_WasmDecoder decoder(&zone, builder, body); |
| 1658 | TreeResult result = decoder.Decode(); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1659 | return result; |
| 1660 | } |
| 1661 | |
| 1662 | |
| 1663 | std::ostream& operator<<(std::ostream& os, const Tree& tree) { |
| 1664 | if (tree.pc == nullptr) { |
| 1665 | os << "null"; |
| 1666 | return os; |
| 1667 | } |
| 1668 | PrintF("%s", WasmOpcodes::OpcodeName(tree.opcode())); |
| 1669 | if (tree.count > 0) os << "("; |
| 1670 | for (uint32_t i = 0; i < tree.count; i++) { |
| 1671 | if (i > 0) os << ", "; |
| 1672 | os << *tree.children[i]; |
| 1673 | } |
| 1674 | if (tree.count > 0) os << ")"; |
| 1675 | return os; |
| 1676 | } |
| 1677 | |
| 1678 | |
| 1679 | ReadUnsignedLEB128ErrorCode ReadUnsignedLEB128Operand(const byte* pc, |
| 1680 | const byte* limit, |
| 1681 | int* length, |
| 1682 | uint32_t* result) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1683 | Decoder decoder(pc, limit); |
| 1684 | *result = decoder.checked_read_u32v(pc, 0, length); |
| 1685 | if (decoder.ok()) return kNoError; |
| 1686 | return (limit - pc) > 1 ? kInvalidLEB128 : kMissingLEB128; |
| 1687 | } |
| 1688 | |
| 1689 | int OpcodeLength(const byte* pc, const byte* end) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1690 | WasmDecoder decoder(nullptr, nullptr, pc, end); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1691 | return decoder.OpcodeLength(pc); |
| 1692 | } |
| 1693 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1694 | int OpcodeArity(ModuleEnv* module, FunctionSig* sig, const byte* pc, |
| 1695 | const byte* end) { |
| 1696 | WasmDecoder decoder(module, sig, pc, end); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1697 | return decoder.OpcodeArity(pc); |
| 1698 | } |
| 1699 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1700 | void PrintAst(base::AccountingAllocator* allocator, FunctionBody& body) { |
| 1701 | Zone zone(allocator); |
| 1702 | SR_WasmDecoder decoder(&zone, nullptr, body); |
| 1703 | |
| 1704 | OFStream os(stdout); |
| 1705 | |
| 1706 | // Print the function signature. |
| 1707 | if (body.sig) { |
| 1708 | os << "// signature: " << *body.sig << std::endl; |
| 1709 | } |
| 1710 | |
| 1711 | // Print the local declarations. |
| 1712 | AstLocalDecls decls(&zone); |
| 1713 | decoder.DecodeLocalDecls(decls); |
| 1714 | const byte* pc = decoder.pc(); |
| 1715 | if (body.start != decoder.pc()) { |
| 1716 | printf("// locals:"); |
| 1717 | for (auto p : decls.local_types) { |
| 1718 | LocalType type = p.first; |
| 1719 | uint32_t count = p.second; |
| 1720 | os << " " << count << " " << WasmOpcodes::TypeName(type); |
| 1721 | } |
| 1722 | os << std::endl; |
| 1723 | |
| 1724 | for (const byte* locals = body.start; locals < pc; locals++) { |
| 1725 | printf(" 0x%02x,", *locals); |
| 1726 | } |
| 1727 | printf("\n"); |
| 1728 | } |
| 1729 | |
| 1730 | printf("// body: \n"); |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1731 | std::vector<int> arity_stack; |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1732 | while (pc < body.end) { |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1733 | int arity = decoder.OpcodeArity(pc); |
| 1734 | size_t length = decoder.OpcodeLength(pc); |
| 1735 | |
| 1736 | for (auto arity : arity_stack) { |
| 1737 | printf(" "); |
| 1738 | USE(arity); |
| 1739 | } |
| 1740 | |
| 1741 | WasmOpcode opcode = static_cast<WasmOpcode>(*pc); |
| 1742 | printf("k%s,", WasmOpcodes::OpcodeName(opcode)); |
| 1743 | |
| 1744 | for (size_t i = 1; i < length; i++) { |
| 1745 | printf(" 0x%02x,", pc[i]); |
| 1746 | } |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1747 | |
| 1748 | if (body.module) { |
| 1749 | switch (opcode) { |
| 1750 | case kExprCallIndirect: { |
| 1751 | SignatureIndexOperand operand(&decoder, pc); |
| 1752 | if (decoder.Validate(pc, operand)) { |
| 1753 | os << " // sig #" << operand.index << ": " << *operand.sig; |
| 1754 | } |
| 1755 | break; |
| 1756 | } |
| 1757 | case kExprCallImport: { |
| 1758 | ImportIndexOperand operand(&decoder, pc); |
| 1759 | if (decoder.Validate(pc, operand)) { |
| 1760 | os << " // import #" << operand.index << ": " << *operand.sig; |
| 1761 | } |
| 1762 | break; |
| 1763 | } |
| 1764 | case kExprCallFunction: { |
| 1765 | FunctionIndexOperand operand(&decoder, pc); |
| 1766 | if (decoder.Validate(pc, operand)) { |
| 1767 | os << " // function #" << operand.index << ": " << *operand.sig; |
| 1768 | } |
| 1769 | break; |
| 1770 | } |
| 1771 | default: |
| 1772 | break; |
| 1773 | } |
| 1774 | } |
| 1775 | |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1776 | pc += length; |
| 1777 | printf("\n"); |
| 1778 | |
| 1779 | arity_stack.push_back(arity); |
| 1780 | while (arity_stack.back() == 0) { |
| 1781 | arity_stack.pop_back(); |
| 1782 | if (arity_stack.empty()) break; |
| 1783 | arity_stack.back()--; |
| 1784 | } |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1785 | } |
| 1786 | } |
| 1787 | |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1788 | BitVector* AnalyzeLoopAssignmentForTesting(Zone* zone, size_t num_locals, |
Ben Murdoch | 097c5b2 | 2016-05-18 11:27:45 +0100 | [diff] [blame] | 1789 | const byte* start, const byte* end) { |
Ben Murdoch | da12d29 | 2016-06-02 14:46:10 +0100 | [diff] [blame^] | 1790 | FunctionBody body = {nullptr, nullptr, nullptr, start, end}; |
| 1791 | SR_WasmDecoder decoder(zone, nullptr, body); |
| 1792 | return decoder.AnalyzeLoopAssignmentForTesting(start, num_locals); |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1793 | } |
| 1794 | |
Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1795 | } // namespace wasm |
| 1796 | } // namespace internal |
| 1797 | } // namespace v8 |