Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame^] | 1 | // Copyright 2006-2008 the V8 project authors. All rights reserved. |
| 2 | // Redistribution and use in source and binary forms, with or without |
| 3 | // modification, are permitted provided that the following conditions are |
| 4 | // met: |
| 5 | // |
| 6 | // * Redistributions of source code must retain the above copyright |
| 7 | // notice, this list of conditions and the following disclaimer. |
| 8 | // * Redistributions in binary form must reproduce the above |
| 9 | // copyright notice, this list of conditions and the following |
| 10 | // disclaimer in the documentation and/or other materials provided |
| 11 | // with the distribution. |
| 12 | // * Neither the name of Google Inc. nor the names of its |
| 13 | // contributors may be used to endorse or promote products derived |
| 14 | // from this software without specific prior written permission. |
| 15 | // |
| 16 | // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 17 | // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 18 | // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 19 | // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 20 | // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 21 | // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 22 | // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 23 | // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 24 | // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 25 | // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 26 | // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 27 | |
| 28 | #ifndef V8_CODEGEN_H_ |
| 29 | #define V8_CODEGEN_H_ |
| 30 | |
| 31 | #include "ast.h" |
| 32 | #include "code-stubs.h" |
| 33 | #include "runtime.h" |
| 34 | |
| 35 | // Include the declaration of the architecture defined class CodeGenerator. |
| 36 | // The contract to the shared code is that the the CodeGenerator is a subclass |
| 37 | // of Visitor and that the following methods are available publicly: |
| 38 | // MakeCode |
| 39 | // SetFunctionInfo |
| 40 | // masm |
| 41 | // frame |
| 42 | // has_valid_frame |
| 43 | // SetFrame |
| 44 | // DeleteFrame |
| 45 | // allocator |
| 46 | // AddDeferred |
| 47 | // in_spilled_code |
| 48 | // set_in_spilled_code |
| 49 | // |
| 50 | // These methods are either used privately by the shared code or implemented as |
| 51 | // shared code: |
| 52 | // CodeGenerator |
| 53 | // ~CodeGenerator |
| 54 | // ProcessDeferred |
| 55 | // GenCode |
| 56 | // BuildBoilerplate |
| 57 | // ComputeCallInitialize |
| 58 | // ComputeCallInitializeInLoop |
| 59 | // ProcessDeclarations |
| 60 | // DeclareGlobals |
| 61 | // FindInlineRuntimeLUT |
| 62 | // CheckForInlineRuntimeCall |
| 63 | // PatchInlineRuntimeEntry |
| 64 | // CodeForFunctionPosition |
| 65 | // CodeForReturnPosition |
| 66 | // CodeForStatementPosition |
| 67 | // CodeForSourcePosition |
| 68 | |
| 69 | |
| 70 | // Mode to overwrite BinaryExpression values. |
| 71 | enum OverwriteMode { NO_OVERWRITE, OVERWRITE_LEFT, OVERWRITE_RIGHT }; |
| 72 | |
| 73 | // Types of uncatchable exceptions. |
| 74 | enum UncatchableExceptionType { OUT_OF_MEMORY, TERMINATION }; |
| 75 | |
| 76 | |
| 77 | #if V8_TARGET_ARCH_IA32 |
| 78 | #include "ia32/codegen-ia32.h" |
| 79 | #elif V8_TARGET_ARCH_X64 |
| 80 | #include "x64/codegen-x64.h" |
| 81 | #elif V8_TARGET_ARCH_ARM |
| 82 | #include "arm/codegen-arm.h" |
| 83 | #else |
| 84 | #error Unsupported target architecture. |
| 85 | #endif |
| 86 | |
| 87 | #include "register-allocator.h" |
| 88 | |
| 89 | namespace v8 { |
| 90 | namespace internal { |
| 91 | |
| 92 | |
| 93 | // Code generation can be nested. Code generation scopes form a stack |
| 94 | // of active code generators. |
| 95 | class CodeGeneratorScope BASE_EMBEDDED { |
| 96 | public: |
| 97 | explicit CodeGeneratorScope(CodeGenerator* cgen) { |
| 98 | previous_ = top_; |
| 99 | top_ = cgen; |
| 100 | } |
| 101 | |
| 102 | ~CodeGeneratorScope() { |
| 103 | top_ = previous_; |
| 104 | } |
| 105 | |
| 106 | static CodeGenerator* Current() { |
| 107 | ASSERT(top_ != NULL); |
| 108 | return top_; |
| 109 | } |
| 110 | |
| 111 | private: |
| 112 | static CodeGenerator* top_; |
| 113 | CodeGenerator* previous_; |
| 114 | }; |
| 115 | |
| 116 | |
| 117 | // Deferred code objects are small pieces of code that are compiled |
| 118 | // out of line. They are used to defer the compilation of uncommon |
| 119 | // paths thereby avoiding expensive jumps around uncommon code parts. |
| 120 | class DeferredCode: public ZoneObject { |
| 121 | public: |
| 122 | DeferredCode(); |
| 123 | virtual ~DeferredCode() { } |
| 124 | |
| 125 | virtual void Generate() = 0; |
| 126 | |
| 127 | MacroAssembler* masm() { return masm_; } |
| 128 | |
| 129 | int statement_position() const { return statement_position_; } |
| 130 | int position() const { return position_; } |
| 131 | |
| 132 | Label* entry_label() { return &entry_label_; } |
| 133 | Label* exit_label() { return &exit_label_; } |
| 134 | |
| 135 | #ifdef DEBUG |
| 136 | void set_comment(const char* comment) { comment_ = comment; } |
| 137 | const char* comment() const { return comment_; } |
| 138 | #else |
| 139 | void set_comment(const char* comment) { } |
| 140 | const char* comment() const { return ""; } |
| 141 | #endif |
| 142 | |
| 143 | inline void Jump(); |
| 144 | inline void Branch(Condition cc); |
| 145 | void BindExit() { masm_->bind(&exit_label_); } |
| 146 | |
| 147 | void SaveRegisters(); |
| 148 | void RestoreRegisters(); |
| 149 | |
| 150 | protected: |
| 151 | MacroAssembler* masm_; |
| 152 | |
| 153 | private: |
| 154 | // Constants indicating special actions. They should not be multiples |
| 155 | // of kPointerSize so they will not collide with valid offsets from |
| 156 | // the frame pointer. |
| 157 | static const int kIgnore = -1; |
| 158 | static const int kPush = 1; |
| 159 | |
| 160 | // This flag is ored with a valid offset from the frame pointer, so |
| 161 | // it should fit in the low zero bits of a valid offset. |
| 162 | static const int kSyncedFlag = 2; |
| 163 | |
| 164 | int statement_position_; |
| 165 | int position_; |
| 166 | |
| 167 | Label entry_label_; |
| 168 | Label exit_label_; |
| 169 | |
| 170 | int registers_[RegisterAllocator::kNumRegisters]; |
| 171 | |
| 172 | #ifdef DEBUG |
| 173 | const char* comment_; |
| 174 | #endif |
| 175 | DISALLOW_COPY_AND_ASSIGN(DeferredCode); |
| 176 | }; |
| 177 | |
| 178 | |
| 179 | // RuntimeStub models code stubs calling entry points in the Runtime class. |
| 180 | class RuntimeStub : public CodeStub { |
| 181 | public: |
| 182 | explicit RuntimeStub(Runtime::FunctionId id, int num_arguments) |
| 183 | : id_(id), num_arguments_(num_arguments) { } |
| 184 | |
| 185 | void Generate(MacroAssembler* masm); |
| 186 | |
| 187 | // Disassembler support. It is useful to be able to print the name |
| 188 | // of the runtime function called through this stub. |
| 189 | static const char* GetNameFromMinorKey(int minor_key) { |
| 190 | return Runtime::FunctionForId(IdField::decode(minor_key))->stub_name; |
| 191 | } |
| 192 | |
| 193 | private: |
| 194 | Runtime::FunctionId id_; |
| 195 | int num_arguments_; |
| 196 | |
| 197 | class ArgumentField: public BitField<int, 0, 16> {}; |
| 198 | class IdField: public BitField<Runtime::FunctionId, 16, kMinorBits - 16> {}; |
| 199 | |
| 200 | Major MajorKey() { return Runtime; } |
| 201 | int MinorKey() { |
| 202 | return IdField::encode(id_) | ArgumentField::encode(num_arguments_); |
| 203 | } |
| 204 | |
| 205 | const char* GetName(); |
| 206 | |
| 207 | #ifdef DEBUG |
| 208 | void Print() { |
| 209 | PrintF("RuntimeStub (id %s)\n", Runtime::FunctionForId(id_)->name); |
| 210 | } |
| 211 | #endif |
| 212 | }; |
| 213 | |
| 214 | |
| 215 | class StackCheckStub : public CodeStub { |
| 216 | public: |
| 217 | StackCheckStub() { } |
| 218 | |
| 219 | void Generate(MacroAssembler* masm); |
| 220 | |
| 221 | private: |
| 222 | |
| 223 | const char* GetName() { return "StackCheckStub"; } |
| 224 | |
| 225 | Major MajorKey() { return StackCheck; } |
| 226 | int MinorKey() { return 0; } |
| 227 | }; |
| 228 | |
| 229 | |
| 230 | class InstanceofStub: public CodeStub { |
| 231 | public: |
| 232 | InstanceofStub() { } |
| 233 | |
| 234 | void Generate(MacroAssembler* masm); |
| 235 | |
| 236 | private: |
| 237 | Major MajorKey() { return Instanceof; } |
| 238 | int MinorKey() { return 0; } |
| 239 | }; |
| 240 | |
| 241 | |
| 242 | class UnarySubStub : public CodeStub { |
| 243 | public: |
| 244 | explicit UnarySubStub(bool overwrite) |
| 245 | : overwrite_(overwrite) { } |
| 246 | |
| 247 | private: |
| 248 | bool overwrite_; |
| 249 | Major MajorKey() { return UnarySub; } |
| 250 | int MinorKey() { return overwrite_ ? 1 : 0; } |
| 251 | void Generate(MacroAssembler* masm); |
| 252 | |
| 253 | const char* GetName() { return "UnarySubStub"; } |
| 254 | }; |
| 255 | |
| 256 | |
| 257 | class CompareStub: public CodeStub { |
| 258 | public: |
| 259 | CompareStub(Condition cc, bool strict) : cc_(cc), strict_(strict) { } |
| 260 | |
| 261 | void Generate(MacroAssembler* masm); |
| 262 | |
| 263 | private: |
| 264 | Condition cc_; |
| 265 | bool strict_; |
| 266 | |
| 267 | Major MajorKey() { return Compare; } |
| 268 | |
| 269 | int MinorKey(); |
| 270 | |
| 271 | // Branch to the label if the given object isn't a symbol. |
| 272 | void BranchIfNonSymbol(MacroAssembler* masm, |
| 273 | Label* label, |
| 274 | Register object, |
| 275 | Register scratch); |
| 276 | |
| 277 | #ifdef DEBUG |
| 278 | void Print() { |
| 279 | PrintF("CompareStub (cc %d), (strict %s)\n", |
| 280 | static_cast<int>(cc_), |
| 281 | strict_ ? "true" : "false"); |
| 282 | } |
| 283 | #endif |
| 284 | }; |
| 285 | |
| 286 | |
| 287 | class CEntryStub : public CodeStub { |
| 288 | public: |
| 289 | explicit CEntryStub(int result_size) : result_size_(result_size) { } |
| 290 | |
| 291 | void Generate(MacroAssembler* masm) { GenerateBody(masm, false); } |
| 292 | |
| 293 | protected: |
| 294 | void GenerateBody(MacroAssembler* masm, bool is_debug_break); |
| 295 | void GenerateCore(MacroAssembler* masm, |
| 296 | Label* throw_normal_exception, |
| 297 | Label* throw_termination_exception, |
| 298 | Label* throw_out_of_memory_exception, |
| 299 | StackFrame::Type frame_type, |
| 300 | bool do_gc, |
| 301 | bool always_allocate_scope); |
| 302 | void GenerateThrowTOS(MacroAssembler* masm); |
| 303 | void GenerateThrowUncatchable(MacroAssembler* masm, |
| 304 | UncatchableExceptionType type); |
| 305 | private: |
| 306 | // Number of pointers/values returned. |
| 307 | int result_size_; |
| 308 | |
| 309 | Major MajorKey() { return CEntry; } |
| 310 | // Minor key must differ if different result_size_ values means different |
| 311 | // code is generated. |
| 312 | int MinorKey(); |
| 313 | |
| 314 | const char* GetName() { return "CEntryStub"; } |
| 315 | }; |
| 316 | |
| 317 | |
| 318 | class CEntryDebugBreakStub : public CEntryStub { |
| 319 | public: |
| 320 | CEntryDebugBreakStub() : CEntryStub(1) { } |
| 321 | |
| 322 | void Generate(MacroAssembler* masm) { GenerateBody(masm, true); } |
| 323 | |
| 324 | private: |
| 325 | int MinorKey() { return 1; } |
| 326 | |
| 327 | const char* GetName() { return "CEntryDebugBreakStub"; } |
| 328 | }; |
| 329 | |
| 330 | |
| 331 | class JSEntryStub : public CodeStub { |
| 332 | public: |
| 333 | JSEntryStub() { } |
| 334 | |
| 335 | void Generate(MacroAssembler* masm) { GenerateBody(masm, false); } |
| 336 | |
| 337 | protected: |
| 338 | void GenerateBody(MacroAssembler* masm, bool is_construct); |
| 339 | |
| 340 | private: |
| 341 | Major MajorKey() { return JSEntry; } |
| 342 | int MinorKey() { return 0; } |
| 343 | |
| 344 | const char* GetName() { return "JSEntryStub"; } |
| 345 | }; |
| 346 | |
| 347 | |
| 348 | class JSConstructEntryStub : public JSEntryStub { |
| 349 | public: |
| 350 | JSConstructEntryStub() { } |
| 351 | |
| 352 | void Generate(MacroAssembler* masm) { GenerateBody(masm, true); } |
| 353 | |
| 354 | private: |
| 355 | int MinorKey() { return 1; } |
| 356 | |
| 357 | const char* GetName() { return "JSConstructEntryStub"; } |
| 358 | }; |
| 359 | |
| 360 | |
| 361 | class ArgumentsAccessStub: public CodeStub { |
| 362 | public: |
| 363 | enum Type { |
| 364 | READ_LENGTH, |
| 365 | READ_ELEMENT, |
| 366 | NEW_OBJECT |
| 367 | }; |
| 368 | |
| 369 | explicit ArgumentsAccessStub(Type type) : type_(type) { } |
| 370 | |
| 371 | private: |
| 372 | Type type_; |
| 373 | |
| 374 | Major MajorKey() { return ArgumentsAccess; } |
| 375 | int MinorKey() { return type_; } |
| 376 | |
| 377 | void Generate(MacroAssembler* masm); |
| 378 | void GenerateReadLength(MacroAssembler* masm); |
| 379 | void GenerateReadElement(MacroAssembler* masm); |
| 380 | void GenerateNewObject(MacroAssembler* masm); |
| 381 | |
| 382 | const char* GetName() { return "ArgumentsAccessStub"; } |
| 383 | |
| 384 | #ifdef DEBUG |
| 385 | void Print() { |
| 386 | PrintF("ArgumentsAccessStub (type %d)\n", type_); |
| 387 | } |
| 388 | #endif |
| 389 | }; |
| 390 | |
| 391 | |
| 392 | } // namespace internal |
| 393 | } // namespace v8 |
| 394 | |
| 395 | #endif // V8_CODEGEN_H_ |