OLD | NEW |
(Empty) | |
| 1 // Copyright 2017 the V8 project authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef V8_ASMJS_ASM_PARSER_H_ |
| 6 #define V8_ASMJS_ASM_PARSER_H_ |
| 7 |
| 8 #include <list> |
| 9 #include <string> |
| 10 #include <vector> |
| 11 |
| 12 #include "src/asmjs/asm-scanner.h" |
| 13 #include "src/asmjs/asm-typer.h" |
| 14 #include "src/asmjs/asm-types.h" |
| 15 #include "src/wasm/signature-map.h" |
| 16 #include "src/wasm/wasm-module-builder.h" |
| 17 #include "src/zone/zone-containers.h" |
| 18 |
| 19 namespace v8 { |
| 20 namespace internal { |
| 21 namespace wasm { |
| 22 |
| 23 // A custom parser + validator + wasm converter for asm.js: |
| 24 // http://asmjs.org/spec/latest/ |
| 25 // This parser intentionally avoids the portion of JavaScript parsing |
| 26 // that are not required to determine if code is valid asm.js code. |
| 27 // * It is mostly one pass. |
| 28 // * It bails out on unexpected input. |
| 29 // * It assumes strict ordering insofar as permitted by asm.js validation rules. |
| 30 // * It relies on a custom scanner that provides de-duped identifiers in two |
| 31 // scopes (local + module wide). |
| 32 class AsmJsParser { |
| 33 public: |
| 34 explicit AsmJsParser(Isolate* isolate, Zone* zone, Handle<Script> script, |
| 35 int start, int end); |
| 36 bool Run(); |
| 37 const char* failure_message() const { return failure_message_.c_str(); } |
| 38 int failure_location() const { return failure_location_; } |
| 39 WasmModuleBuilder* module_builder() { return module_builder_; } |
| 40 const AsmTyper::StdlibSet* stdlib_uses() const { return &stdlib_uses_; } |
| 41 |
| 42 private: |
| 43 // clang-format off |
| 44 enum class VarKind { |
| 45 kUnused, |
| 46 kLocal, |
| 47 kGlobal, |
| 48 kSpecial, |
| 49 kFunction, |
| 50 kTable, |
| 51 kImportedFunction, |
| 52 #define V(_unused0, Name, _unused1, _unused2) kMath##Name, |
| 53 STDLIB_MATH_FUNCTION_LIST(V) |
| 54 #undef V |
| 55 #define V(Name) kMath##Name, |
| 56 STDLIB_MATH_VALUE_LIST(V) |
| 57 #undef V |
| 58 }; |
| 59 // clang-format on |
| 60 |
| 61 struct FunctionImportInfo { |
| 62 std::string name; |
| 63 SignatureMap cache; |
| 64 std::vector<uint32_t> cache_index; |
| 65 }; |
| 66 |
| 67 struct VarInfo { |
| 68 AsmType* type; |
| 69 WasmFunctionBuilder* function_builder; |
| 70 FunctionImportInfo* import; |
| 71 int32_t mask; |
| 72 uint32_t index; |
| 73 VarKind kind; |
| 74 bool mutable_variable; |
| 75 bool function_defined; |
| 76 |
| 77 VarInfo(); |
| 78 void DeclareGlobalImport(AsmType* type, uint32_t index); |
| 79 void DeclareStdlibFunc(VarKind kind, AsmType* type); |
| 80 }; |
| 81 |
| 82 struct GlobalImport { |
| 83 std::string import_name; |
| 84 uint32_t import_index; |
| 85 uint32_t global_index; |
| 86 bool needs_init; |
| 87 }; |
| 88 |
| 89 enum class BlockKind { kRegular, kLoop, kOther }; |
| 90 |
| 91 struct BlockInfo { |
| 92 BlockKind kind; |
| 93 AsmJsScanner::token_t label; |
| 94 }; |
| 95 |
| 96 Zone* zone_; |
| 97 AsmJsScanner scanner_; |
| 98 WasmModuleBuilder* module_builder_; |
| 99 WasmFunctionBuilder* current_function_builder_; |
| 100 AsmType* return_type_; |
| 101 std::uintptr_t stack_limit_; |
| 102 AsmTyper::StdlibSet stdlib_uses_; |
| 103 std::list<FunctionImportInfo> function_import_info_; |
| 104 ZoneVector<VarInfo> global_var_info_; |
| 105 ZoneVector<VarInfo> local_var_info_; |
| 106 |
| 107 int function_temp_locals_offset_; |
| 108 int function_temp_locals_used_; |
| 109 |
| 110 // Error Handling related |
| 111 bool failed_; |
| 112 std::string failure_message_; |
| 113 int failure_location_; |
| 114 |
| 115 // Module Related. |
| 116 AsmJsScanner::token_t stdlib_name_; |
| 117 AsmJsScanner::token_t foreign_name_; |
| 118 AsmJsScanner::token_t heap_name_; |
| 119 |
| 120 static const AsmJsScanner::token_t kTokenNone = 0; |
| 121 |
| 122 // Track if parsing a heap assignment. |
| 123 bool inside_heap_assignment_; |
| 124 AsmType* heap_access_type_; |
| 125 |
| 126 ZoneVector<BlockInfo> block_stack_; |
| 127 |
| 128 // Types used for stdlib function and their set up. |
| 129 AsmType* stdlib_dq2d_; |
| 130 AsmType* stdlib_dqdq2d_; |
| 131 AsmType* stdlib_fq2f_; |
| 132 AsmType* stdlib_i2s_; |
| 133 AsmType* stdlib_ii2s_; |
| 134 AsmType* stdlib_minmax_; |
| 135 AsmType* stdlib_abs_; |
| 136 AsmType* stdlib_ceil_like_; |
| 137 AsmType* stdlib_fround_; |
| 138 |
| 139 // When making calls, the return type is needed to lookup signatures. |
| 140 // For +callsite(..) or fround(callsite(..)) use this value to pass |
| 141 // along the coercion. |
| 142 AsmType* call_coercion_; |
| 143 |
| 144 // Used to track the last label we've seen so it can be matched to later |
| 145 // statements it's attached to. |
| 146 AsmJsScanner::token_t pending_label_; |
| 147 |
| 148 // Global imports. |
| 149 // NOTE: Holds the strings referenced in wasm-module-builder for imports. |
| 150 ZoneLinkedList<GlobalImport> global_imports_; |
| 151 |
| 152 Zone* zone() { return zone_; } |
| 153 |
| 154 inline bool Peek(AsmJsScanner::token_t token) { |
| 155 return scanner_.Token() == token; |
| 156 } |
| 157 |
| 158 inline bool Check(AsmJsScanner::token_t token) { |
| 159 if (scanner_.Token() == token) { |
| 160 scanner_.Next(); |
| 161 return true; |
| 162 } else { |
| 163 return false; |
| 164 } |
| 165 } |
| 166 |
| 167 inline bool CheckForZero() { |
| 168 if (scanner_.IsUnsigned() && scanner_.AsUnsigned() == 0) { |
| 169 scanner_.Next(); |
| 170 return true; |
| 171 } else { |
| 172 return false; |
| 173 } |
| 174 } |
| 175 |
| 176 inline bool CheckForDouble(double* value) { |
| 177 if (scanner_.IsDouble()) { |
| 178 *value = scanner_.AsDouble(); |
| 179 scanner_.Next(); |
| 180 return true; |
| 181 } else { |
| 182 return false; |
| 183 } |
| 184 } |
| 185 |
| 186 inline bool CheckForUnsigned(uint64_t* value) { |
| 187 if (scanner_.IsUnsigned()) { |
| 188 *value = scanner_.AsUnsigned(); |
| 189 scanner_.Next(); |
| 190 return true; |
| 191 } else { |
| 192 return false; |
| 193 } |
| 194 } |
| 195 |
| 196 inline bool CheckForUnsignedBelow(uint64_t limit, uint64_t* value) { |
| 197 if (scanner_.IsUnsigned() && scanner_.AsUnsigned() < limit) { |
| 198 *value = scanner_.AsUnsigned(); |
| 199 scanner_.Next(); |
| 200 return true; |
| 201 } else { |
| 202 return false; |
| 203 } |
| 204 } |
| 205 |
| 206 inline AsmJsScanner::token_t Consume() { |
| 207 AsmJsScanner::token_t ret = scanner_.Token(); |
| 208 scanner_.Next(); |
| 209 return ret; |
| 210 } |
| 211 |
| 212 void SkipSemicolon(); |
| 213 |
| 214 VarInfo* GetVarInfo(AsmJsScanner::token_t token); |
| 215 uint32_t VarIndex(VarInfo* info); |
| 216 void DeclareGlobal(VarInfo* info, bool mutable_variable, AsmType* type, |
| 217 ValueType vtype, |
| 218 const WasmInitExpr& init = WasmInitExpr()); |
| 219 |
| 220 int32_t TempVariable(int i); |
| 221 |
| 222 void AddGlobalImport(std::string name, AsmType* type, ValueType vtype, |
| 223 bool mutable_variable, VarInfo* info); |
| 224 |
| 225 // Use to set up block stack layers (including synthetic ones for if-else). |
| 226 // Begin/Loop/End below are implemented with these plus code generation. |
| 227 void BareBegin(BlockKind kind = BlockKind::kOther, |
| 228 AsmJsScanner::token_t label = 0); |
| 229 void BareEnd(); |
| 230 int FindContinueLabelDepth(AsmJsScanner::token_t label); |
| 231 int FindBreakLabelDepth(AsmJsScanner::token_t label); |
| 232 |
| 233 // Use to set up actual wasm blocks/loops. |
| 234 void Begin(AsmJsScanner::token_t label = 0); |
| 235 void Loop(AsmJsScanner::token_t label = 0); |
| 236 void End(); |
| 237 |
| 238 void InitializeStdlibTypes(); |
| 239 |
| 240 FunctionSig* ConvertSignature(AsmType* return_type, |
| 241 const std::vector<AsmType*>& params); |
| 242 |
| 243 // 6.1 ValidateModule |
| 244 void ValidateModule(); |
| 245 void ValidateModuleParameters(); |
| 246 void ValidateModuleVars(); |
| 247 void ValidateModuleVar(bool mutable_variable); |
| 248 bool ValidateModuleVarImport(VarInfo* info, bool mutable_variable); |
| 249 void ValidateModuleVarStdlib(VarInfo* info); |
| 250 void ValidateModuleVarNewStdlib(VarInfo* info); |
| 251 void ValidateModuleVarFloat(VarInfo* info, bool mutable_variable); |
| 252 |
| 253 void ValidateExport(); // 6.2 ValidateExport |
| 254 void ValidateFunctionTable(); // 6.3 ValidateFunctionTable |
| 255 void ValidateFunction(); // 6.4 ValidateFunction |
| 256 void ValidateFunctionParams(std::vector<AsmType*>* params); |
| 257 void ValidateFunctionLocals(size_t param_count, |
| 258 std::vector<ValueType>* locals); |
| 259 void ValidateStatement(); // ValidateStatement |
| 260 void Block(); // 6.5.1 Block |
| 261 void ExpressionStatement(); // 6.5.2 ExpressionStatement |
| 262 void EmptyStatement(); // 6.5.3 EmptyStatement |
| 263 void IfStatement(); // 6.5.4 IfStatement |
| 264 void ReturnStatement(); // 6.5.5 ReturnStatement |
| 265 bool IterationStatement(); // 6.5.6 IterationStatement |
| 266 void WhileStatement(); // 6.5.6 IterationStatement - while |
| 267 void DoStatement(); // 6.5.6 IterationStatement - do |
| 268 void ForStatement(); // 6.5.6 IterationStatement - for |
| 269 void BreakStatement(); // 6.5.7 BreakStatement |
| 270 void ContinueStatement(); // 6.5.8 ContinueStatement |
| 271 void LabelledStatement(); // 6.5.9 LabelledStatement |
| 272 void SwitchStatement(); // 6.5.10 SwitchStatement |
| 273 void ValidateCase(); // 6.6. ValidateCase |
| 274 void ValidateDefault(); // 6.7 ValidateDefault |
| 275 AsmType* ValidateExpression(); // 6.8 ValidateExpression |
| 276 AsmType* Expression(AsmType* expect); // 6.8.1 Expression |
| 277 AsmType* NumericLiteral(); // 6.8.2 NumericLiteral |
| 278 AsmType* Identifier(); // 6.8.3 Identifier |
| 279 AsmType* CallExpression(); // 6.8.4 CallExpression |
| 280 AsmType* MemberExpression(); // 6.8.5 MemberExpression |
| 281 AsmType* AssignmentExpression(); // 6.8.6 AssignmentExpression |
| 282 AsmType* UnaryExpression(); // 6.8.7 UnaryExpression |
| 283 AsmType* MultiplicativeExpression(); // 6.8.8 MultaplicativeExpression |
| 284 AsmType* AdditiveExpression(); // 6.8.9 AdditiveExpression |
| 285 AsmType* ShiftExpression(); // 6.8.10 ShiftExpression |
| 286 AsmType* RelationalExpression(); // 6.8.11 RelationalExpression |
| 287 AsmType* EqualityExpression(); // 6.8.12 EqualityExpression |
| 288 AsmType* BitwiseANDExpression(); // 6.8.13 BitwiseANDExpression |
| 289 AsmType* BitwiseXORExpression(); // 6.8.14 BitwiseXORExpression |
| 290 AsmType* BitwiseORExpression(); // 6.8.15 BitwiseORExpression |
| 291 AsmType* ConditionalExpression(); // 6.8.16 ConditionalExpression |
| 292 AsmType* ParenthesizedExpression(); // 6.8.17 ParenthesiedExpression |
| 293 AsmType* ValidateCall(); // 6.9 ValidateCall |
| 294 bool PeekCall(); // 6.9 ValidateCall - helper |
| 295 void ValidateHeapAccess(); // 6.10 ValidateHeapAccess |
| 296 void ValidateFloatCoercion(); // 6.11 ValidateFloatCoercion |
| 297 |
| 298 void GatherCases(std::vector<int32_t>* cases); |
| 299 }; |
| 300 |
| 301 } // namespace wasm |
| 302 } // namespace internal |
| 303 } // namespace v8 |
| 304 #endif |
OLD | NEW |