Emily Bernier | d0a1eb7 | 2015-03-24 16:35:39 -0400 | [diff] [blame^] | 1 | // Copyright 2014 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_PPC_MACRO_ASSEMBLER_PPC_H_ |
| 6 | #define V8_PPC_MACRO_ASSEMBLER_PPC_H_ |
| 7 | |
| 8 | #include "src/assembler.h" |
| 9 | #include "src/bailout-reason.h" |
| 10 | #include "src/frames.h" |
| 11 | #include "src/globals.h" |
| 12 | |
| 13 | namespace v8 { |
| 14 | namespace internal { |
| 15 | |
| 16 | // ---------------------------------------------------------------------------- |
| 17 | // Static helper functions |
| 18 | |
| 19 | // Generate a MemOperand for loading a field from an object. |
| 20 | inline MemOperand FieldMemOperand(Register object, int offset) { |
| 21 | return MemOperand(object, offset - kHeapObjectTag); |
| 22 | } |
| 23 | |
| 24 | |
| 25 | // Flags used for AllocateHeapNumber |
| 26 | enum TaggingMode { |
| 27 | // Tag the result. |
| 28 | TAG_RESULT, |
| 29 | // Don't tag |
| 30 | DONT_TAG_RESULT |
| 31 | }; |
| 32 | |
| 33 | |
| 34 | enum RememberedSetAction { EMIT_REMEMBERED_SET, OMIT_REMEMBERED_SET }; |
| 35 | enum SmiCheck { INLINE_SMI_CHECK, OMIT_SMI_CHECK }; |
| 36 | enum PointersToHereCheck { |
| 37 | kPointersToHereMaybeInteresting, |
| 38 | kPointersToHereAreAlwaysInteresting |
| 39 | }; |
| 40 | enum LinkRegisterStatus { kLRHasNotBeenSaved, kLRHasBeenSaved }; |
| 41 | |
| 42 | |
| 43 | Register GetRegisterThatIsNotOneOf(Register reg1, Register reg2 = no_reg, |
| 44 | Register reg3 = no_reg, |
| 45 | Register reg4 = no_reg, |
| 46 | Register reg5 = no_reg, |
| 47 | Register reg6 = no_reg); |
| 48 | |
| 49 | |
| 50 | #ifdef DEBUG |
| 51 | bool AreAliased(Register reg1, Register reg2, Register reg3 = no_reg, |
| 52 | Register reg4 = no_reg, Register reg5 = no_reg, |
| 53 | Register reg6 = no_reg, Register reg7 = no_reg, |
| 54 | Register reg8 = no_reg); |
| 55 | #endif |
| 56 | |
| 57 | // These exist to provide portability between 32 and 64bit |
| 58 | #if V8_TARGET_ARCH_PPC64 |
| 59 | #define LoadPU ldu |
| 60 | #define LoadPX ldx |
| 61 | #define LoadPUX ldux |
| 62 | #define StorePU stdu |
| 63 | #define StorePX stdx |
| 64 | #define StorePUX stdux |
| 65 | #define ShiftLeftImm sldi |
| 66 | #define ShiftRightImm srdi |
| 67 | #define ClearLeftImm clrldi |
| 68 | #define ClearRightImm clrrdi |
| 69 | #define ShiftRightArithImm sradi |
| 70 | #define ShiftLeft_ sld |
| 71 | #define ShiftRight_ srd |
| 72 | #define ShiftRightArith srad |
| 73 | #define Mul mulld |
| 74 | #define Div divd |
| 75 | #else |
| 76 | #define LoadPU lwzu |
| 77 | #define LoadPX lwzx |
| 78 | #define LoadPUX lwzux |
| 79 | #define StorePU stwu |
| 80 | #define StorePX stwx |
| 81 | #define StorePUX stwux |
| 82 | #define ShiftLeftImm slwi |
| 83 | #define ShiftRightImm srwi |
| 84 | #define ClearLeftImm clrlwi |
| 85 | #define ClearRightImm clrrwi |
| 86 | #define ShiftRightArithImm srawi |
| 87 | #define ShiftLeft_ slw |
| 88 | #define ShiftRight_ srw |
| 89 | #define ShiftRightArith sraw |
| 90 | #define Mul mullw |
| 91 | #define Div divw |
| 92 | #endif |
| 93 | |
| 94 | |
| 95 | // MacroAssembler implements a collection of frequently used macros. |
| 96 | class MacroAssembler : public Assembler { |
| 97 | public: |
| 98 | // The isolate parameter can be NULL if the macro assembler should |
| 99 | // not use isolate-dependent functionality. In this case, it's the |
| 100 | // responsibility of the caller to never invoke such function on the |
| 101 | // macro assembler. |
| 102 | MacroAssembler(Isolate* isolate, void* buffer, int size); |
| 103 | |
| 104 | |
| 105 | // Returns the size of a call in instructions. Note, the value returned is |
| 106 | // only valid as long as no entries are added to the constant pool between |
| 107 | // checking the call size and emitting the actual call. |
| 108 | static int CallSize(Register target); |
| 109 | int CallSize(Address target, RelocInfo::Mode rmode, Condition cond = al); |
| 110 | static int CallSizeNotPredictableCodeSize(Address target, |
| 111 | RelocInfo::Mode rmode, |
| 112 | Condition cond = al); |
| 113 | |
| 114 | // Jump, Call, and Ret pseudo instructions implementing inter-working. |
| 115 | void Jump(Register target); |
| 116 | void JumpToJSEntry(Register target); |
| 117 | void Jump(Address target, RelocInfo::Mode rmode, Condition cond = al, |
| 118 | CRegister cr = cr7); |
| 119 | void Jump(Handle<Code> code, RelocInfo::Mode rmode, Condition cond = al); |
| 120 | void Call(Register target); |
| 121 | void CallJSEntry(Register target); |
| 122 | void Call(Address target, RelocInfo::Mode rmode, Condition cond = al); |
| 123 | int CallSize(Handle<Code> code, |
| 124 | RelocInfo::Mode rmode = RelocInfo::CODE_TARGET, |
| 125 | TypeFeedbackId ast_id = TypeFeedbackId::None(), |
| 126 | Condition cond = al); |
| 127 | void Call(Handle<Code> code, RelocInfo::Mode rmode = RelocInfo::CODE_TARGET, |
| 128 | TypeFeedbackId ast_id = TypeFeedbackId::None(), |
| 129 | Condition cond = al); |
| 130 | void Ret(Condition cond = al); |
| 131 | |
| 132 | // Emit code to discard a non-negative number of pointer-sized elements |
| 133 | // from the stack, clobbering only the sp register. |
| 134 | void Drop(int count, Condition cond = al); |
| 135 | |
| 136 | void Ret(int drop, Condition cond = al); |
| 137 | |
| 138 | void Call(Label* target); |
| 139 | |
| 140 | // Emit call to the code we are currently generating. |
| 141 | void CallSelf() { |
| 142 | Handle<Code> self(reinterpret_cast<Code**>(CodeObject().location())); |
| 143 | Call(self, RelocInfo::CODE_TARGET); |
| 144 | } |
| 145 | |
| 146 | // Register move. May do nothing if the registers are identical. |
| 147 | void Move(Register dst, Handle<Object> value); |
| 148 | void Move(Register dst, Register src, Condition cond = al); |
| 149 | void Move(DoubleRegister dst, DoubleRegister src); |
| 150 | |
| 151 | void MultiPush(RegList regs); |
| 152 | void MultiPop(RegList regs); |
| 153 | |
| 154 | // Load an object from the root table. |
| 155 | void LoadRoot(Register destination, Heap::RootListIndex index, |
| 156 | Condition cond = al); |
| 157 | // Store an object to the root table. |
| 158 | void StoreRoot(Register source, Heap::RootListIndex index, |
| 159 | Condition cond = al); |
| 160 | |
| 161 | // --------------------------------------------------------------------------- |
| 162 | // GC Support |
| 163 | |
| 164 | void IncrementalMarkingRecordWriteHelper(Register object, Register value, |
| 165 | Register address); |
| 166 | |
| 167 | enum RememberedSetFinalAction { kReturnAtEnd, kFallThroughAtEnd }; |
| 168 | |
| 169 | // Record in the remembered set the fact that we have a pointer to new space |
| 170 | // at the address pointed to by the addr register. Only works if addr is not |
| 171 | // in new space. |
| 172 | void RememberedSetHelper(Register object, // Used for debug code. |
| 173 | Register addr, Register scratch, |
| 174 | SaveFPRegsMode save_fp, |
| 175 | RememberedSetFinalAction and_then); |
| 176 | |
| 177 | void CheckPageFlag(Register object, Register scratch, int mask, Condition cc, |
| 178 | Label* condition_met); |
| 179 | |
| 180 | void CheckMapDeprecated(Handle<Map> map, Register scratch, |
| 181 | Label* if_deprecated); |
| 182 | |
| 183 | // Check if object is in new space. Jumps if the object is not in new space. |
| 184 | // The register scratch can be object itself, but scratch will be clobbered. |
| 185 | void JumpIfNotInNewSpace(Register object, Register scratch, Label* branch) { |
| 186 | InNewSpace(object, scratch, ne, branch); |
| 187 | } |
| 188 | |
| 189 | // Check if object is in new space. Jumps if the object is in new space. |
| 190 | // The register scratch can be object itself, but it will be clobbered. |
| 191 | void JumpIfInNewSpace(Register object, Register scratch, Label* branch) { |
| 192 | InNewSpace(object, scratch, eq, branch); |
| 193 | } |
| 194 | |
| 195 | // Check if an object has a given incremental marking color. |
| 196 | void HasColor(Register object, Register scratch0, Register scratch1, |
| 197 | Label* has_color, int first_bit, int second_bit); |
| 198 | |
| 199 | void JumpIfBlack(Register object, Register scratch0, Register scratch1, |
| 200 | Label* on_black); |
| 201 | |
| 202 | // Checks the color of an object. If the object is already grey or black |
| 203 | // then we just fall through, since it is already live. If it is white and |
| 204 | // we can determine that it doesn't need to be scanned, then we just mark it |
| 205 | // black and fall through. For the rest we jump to the label so the |
| 206 | // incremental marker can fix its assumptions. |
| 207 | void EnsureNotWhite(Register object, Register scratch1, Register scratch2, |
| 208 | Register scratch3, Label* object_is_white_and_not_data); |
| 209 | |
| 210 | // Detects conservatively whether an object is data-only, i.e. it does need to |
| 211 | // be scanned by the garbage collector. |
| 212 | void JumpIfDataObject(Register value, Register scratch, |
| 213 | Label* not_data_object); |
| 214 | |
| 215 | // Notify the garbage collector that we wrote a pointer into an object. |
| 216 | // |object| is the object being stored into, |value| is the object being |
| 217 | // stored. value and scratch registers are clobbered by the operation. |
| 218 | // The offset is the offset from the start of the object, not the offset from |
| 219 | // the tagged HeapObject pointer. For use with FieldOperand(reg, off). |
| 220 | void RecordWriteField( |
| 221 | Register object, int offset, Register value, Register scratch, |
| 222 | LinkRegisterStatus lr_status, SaveFPRegsMode save_fp, |
| 223 | RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, |
| 224 | SmiCheck smi_check = INLINE_SMI_CHECK, |
| 225 | PointersToHereCheck pointers_to_here_check_for_value = |
| 226 | kPointersToHereMaybeInteresting); |
| 227 | |
| 228 | // As above, but the offset has the tag presubtracted. For use with |
| 229 | // MemOperand(reg, off). |
| 230 | inline void RecordWriteContextSlot( |
| 231 | Register context, int offset, Register value, Register scratch, |
| 232 | LinkRegisterStatus lr_status, SaveFPRegsMode save_fp, |
| 233 | RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, |
| 234 | SmiCheck smi_check = INLINE_SMI_CHECK, |
| 235 | PointersToHereCheck pointers_to_here_check_for_value = |
| 236 | kPointersToHereMaybeInteresting) { |
| 237 | RecordWriteField(context, offset + kHeapObjectTag, value, scratch, |
| 238 | lr_status, save_fp, remembered_set_action, smi_check, |
| 239 | pointers_to_here_check_for_value); |
| 240 | } |
| 241 | |
| 242 | void RecordWriteForMap(Register object, Register map, Register dst, |
| 243 | LinkRegisterStatus lr_status, SaveFPRegsMode save_fp); |
| 244 | |
| 245 | // For a given |object| notify the garbage collector that the slot |address| |
| 246 | // has been written. |value| is the object being stored. The value and |
| 247 | // address registers are clobbered by the operation. |
| 248 | void RecordWrite( |
| 249 | Register object, Register address, Register value, |
| 250 | LinkRegisterStatus lr_status, SaveFPRegsMode save_fp, |
| 251 | RememberedSetAction remembered_set_action = EMIT_REMEMBERED_SET, |
| 252 | SmiCheck smi_check = INLINE_SMI_CHECK, |
| 253 | PointersToHereCheck pointers_to_here_check_for_value = |
| 254 | kPointersToHereMaybeInteresting); |
| 255 | |
| 256 | void Push(Register src) { push(src); } |
| 257 | |
| 258 | // Push a handle. |
| 259 | void Push(Handle<Object> handle); |
| 260 | void Push(Smi* smi) { Push(Handle<Smi>(smi, isolate())); } |
| 261 | |
| 262 | // Push two registers. Pushes leftmost register first (to highest address). |
| 263 | void Push(Register src1, Register src2) { |
| 264 | StorePU(src2, MemOperand(sp, -2 * kPointerSize)); |
| 265 | StoreP(src1, MemOperand(sp, kPointerSize)); |
| 266 | } |
| 267 | |
| 268 | // Push three registers. Pushes leftmost register first (to highest address). |
| 269 | void Push(Register src1, Register src2, Register src3) { |
| 270 | StorePU(src3, MemOperand(sp, -3 * kPointerSize)); |
| 271 | StoreP(src2, MemOperand(sp, kPointerSize)); |
| 272 | StoreP(src1, MemOperand(sp, 2 * kPointerSize)); |
| 273 | } |
| 274 | |
| 275 | // Push four registers. Pushes leftmost register first (to highest address). |
| 276 | void Push(Register src1, Register src2, Register src3, Register src4) { |
| 277 | StorePU(src4, MemOperand(sp, -4 * kPointerSize)); |
| 278 | StoreP(src3, MemOperand(sp, kPointerSize)); |
| 279 | StoreP(src2, MemOperand(sp, 2 * kPointerSize)); |
| 280 | StoreP(src1, MemOperand(sp, 3 * kPointerSize)); |
| 281 | } |
| 282 | |
| 283 | // Push five registers. Pushes leftmost register first (to highest address). |
| 284 | void Push(Register src1, Register src2, Register src3, Register src4, |
| 285 | Register src5) { |
| 286 | StorePU(src5, MemOperand(sp, -5 * kPointerSize)); |
| 287 | StoreP(src4, MemOperand(sp, kPointerSize)); |
| 288 | StoreP(src3, MemOperand(sp, 2 * kPointerSize)); |
| 289 | StoreP(src2, MemOperand(sp, 3 * kPointerSize)); |
| 290 | StoreP(src1, MemOperand(sp, 4 * kPointerSize)); |
| 291 | } |
| 292 | |
| 293 | void Pop(Register dst) { pop(dst); } |
| 294 | |
| 295 | // Pop two registers. Pops rightmost register first (from lower address). |
| 296 | void Pop(Register src1, Register src2) { |
| 297 | LoadP(src2, MemOperand(sp, 0)); |
| 298 | LoadP(src1, MemOperand(sp, kPointerSize)); |
| 299 | addi(sp, sp, Operand(2 * kPointerSize)); |
| 300 | } |
| 301 | |
| 302 | // Pop three registers. Pops rightmost register first (from lower address). |
| 303 | void Pop(Register src1, Register src2, Register src3) { |
| 304 | LoadP(src3, MemOperand(sp, 0)); |
| 305 | LoadP(src2, MemOperand(sp, kPointerSize)); |
| 306 | LoadP(src1, MemOperand(sp, 2 * kPointerSize)); |
| 307 | addi(sp, sp, Operand(3 * kPointerSize)); |
| 308 | } |
| 309 | |
| 310 | // Pop four registers. Pops rightmost register first (from lower address). |
| 311 | void Pop(Register src1, Register src2, Register src3, Register src4) { |
| 312 | LoadP(src4, MemOperand(sp, 0)); |
| 313 | LoadP(src3, MemOperand(sp, kPointerSize)); |
| 314 | LoadP(src2, MemOperand(sp, 2 * kPointerSize)); |
| 315 | LoadP(src1, MemOperand(sp, 3 * kPointerSize)); |
| 316 | addi(sp, sp, Operand(4 * kPointerSize)); |
| 317 | } |
| 318 | |
| 319 | // Pop five registers. Pops rightmost register first (from lower address). |
| 320 | void Pop(Register src1, Register src2, Register src3, Register src4, |
| 321 | Register src5) { |
| 322 | LoadP(src5, MemOperand(sp, 0)); |
| 323 | LoadP(src4, MemOperand(sp, kPointerSize)); |
| 324 | LoadP(src3, MemOperand(sp, 2 * kPointerSize)); |
| 325 | LoadP(src2, MemOperand(sp, 3 * kPointerSize)); |
| 326 | LoadP(src1, MemOperand(sp, 4 * kPointerSize)); |
| 327 | addi(sp, sp, Operand(5 * kPointerSize)); |
| 328 | } |
| 329 | |
| 330 | // Push a fixed frame, consisting of lr, fp, context and |
| 331 | // JS function / marker id if marker_reg is a valid register. |
| 332 | void PushFixedFrame(Register marker_reg = no_reg); |
| 333 | void PopFixedFrame(Register marker_reg = no_reg); |
| 334 | |
| 335 | // Push and pop the registers that can hold pointers, as defined by the |
| 336 | // RegList constant kSafepointSavedRegisters. |
| 337 | void PushSafepointRegisters(); |
| 338 | void PopSafepointRegisters(); |
| 339 | // Store value in register src in the safepoint stack slot for |
| 340 | // register dst. |
| 341 | void StoreToSafepointRegisterSlot(Register src, Register dst); |
| 342 | // Load the value of the src register from its safepoint stack slot |
| 343 | // into register dst. |
| 344 | void LoadFromSafepointRegisterSlot(Register dst, Register src); |
| 345 | |
| 346 | // Flush the I-cache from asm code. You should use CpuFeatures::FlushICache |
| 347 | // from C. |
| 348 | // Does not handle errors. |
| 349 | void FlushICache(Register address, size_t size, Register scratch); |
| 350 | |
| 351 | // If the value is a NaN, canonicalize the value else, do nothing. |
| 352 | void CanonicalizeNaN(const DoubleRegister dst, const DoubleRegister src); |
| 353 | void CanonicalizeNaN(const DoubleRegister value) { |
| 354 | CanonicalizeNaN(value, value); |
| 355 | } |
| 356 | |
| 357 | // Converts the integer (untagged smi) in |src| to a double, storing |
| 358 | // the result to |double_dst| |
| 359 | void ConvertIntToDouble(Register src, DoubleRegister double_dst); |
| 360 | |
| 361 | // Converts the unsigned integer (untagged smi) in |src| to |
| 362 | // a double, storing the result to |double_dst| |
| 363 | void ConvertUnsignedIntToDouble(Register src, DoubleRegister double_dst); |
| 364 | |
| 365 | // Converts the integer (untagged smi) in |src| to |
| 366 | // a float, storing the result in |dst| |
| 367 | // Warning: The value in |int_scrach| will be changed in the process! |
| 368 | void ConvertIntToFloat(const DoubleRegister dst, const Register src, |
| 369 | const Register int_scratch); |
| 370 | |
| 371 | // Converts the double_input to an integer. Note that, upon return, |
| 372 | // the contents of double_dst will also hold the fixed point representation. |
| 373 | void ConvertDoubleToInt64(const DoubleRegister double_input, |
| 374 | #if !V8_TARGET_ARCH_PPC64 |
| 375 | const Register dst_hi, |
| 376 | #endif |
| 377 | const Register dst, const DoubleRegister double_dst, |
| 378 | FPRoundingMode rounding_mode = kRoundToZero); |
| 379 | |
| 380 | // Generates function and stub prologue code. |
| 381 | void StubPrologue(int prologue_offset = 0); |
| 382 | void Prologue(bool code_pre_aging, int prologue_offset = 0); |
| 383 | |
| 384 | // Enter exit frame. |
| 385 | // stack_space - extra stack space, used for alignment before call to C. |
| 386 | void EnterExitFrame(bool save_doubles, int stack_space = 0); |
| 387 | |
| 388 | // Leave the current exit frame. Expects the return value in r0. |
| 389 | // Expect the number of values, pushed prior to the exit frame, to |
| 390 | // remove in a register (or no_reg, if there is nothing to remove). |
| 391 | void LeaveExitFrame(bool save_doubles, Register argument_count, |
| 392 | bool restore_context); |
| 393 | |
| 394 | // Get the actual activation frame alignment for target environment. |
| 395 | static int ActivationFrameAlignment(); |
| 396 | |
| 397 | void LoadContext(Register dst, int context_chain_length); |
| 398 | |
| 399 | // Conditionally load the cached Array transitioned map of type |
| 400 | // transitioned_kind from the native context if the map in register |
| 401 | // map_in_out is the cached Array map in the native context of |
| 402 | // expected_kind. |
| 403 | void LoadTransitionedArrayMapConditional(ElementsKind expected_kind, |
| 404 | ElementsKind transitioned_kind, |
| 405 | Register map_in_out, |
| 406 | Register scratch, |
| 407 | Label* no_map_match); |
| 408 | |
| 409 | void LoadGlobalFunction(int index, Register function); |
| 410 | |
| 411 | // Load the initial map from the global function. The registers |
| 412 | // function and map can be the same, function is then overwritten. |
| 413 | void LoadGlobalFunctionInitialMap(Register function, Register map, |
| 414 | Register scratch); |
| 415 | |
| 416 | void InitializeRootRegister() { |
| 417 | ExternalReference roots_array_start = |
| 418 | ExternalReference::roots_array_start(isolate()); |
| 419 | mov(kRootRegister, Operand(roots_array_start)); |
| 420 | } |
| 421 | |
| 422 | // ---------------------------------------------------------------- |
| 423 | // new PPC macro-assembler interfaces that are slightly higher level |
| 424 | // than assembler-ppc and may generate variable length sequences |
| 425 | |
| 426 | // load a literal signed int value <value> to GPR <dst> |
| 427 | void LoadIntLiteral(Register dst, int value); |
| 428 | |
| 429 | // load an SMI value <value> to GPR <dst> |
| 430 | void LoadSmiLiteral(Register dst, Smi* smi); |
| 431 | |
| 432 | // load a literal double value <value> to FPR <result> |
| 433 | void LoadDoubleLiteral(DoubleRegister result, double value, Register scratch); |
| 434 | |
| 435 | void LoadWord(Register dst, const MemOperand& mem, Register scratch); |
| 436 | |
| 437 | void LoadWordArith(Register dst, const MemOperand& mem, |
| 438 | Register scratch = no_reg); |
| 439 | |
| 440 | void StoreWord(Register src, const MemOperand& mem, Register scratch); |
| 441 | |
| 442 | void LoadHalfWord(Register dst, const MemOperand& mem, Register scratch); |
| 443 | |
| 444 | void StoreHalfWord(Register src, const MemOperand& mem, Register scratch); |
| 445 | |
| 446 | void LoadByte(Register dst, const MemOperand& mem, Register scratch); |
| 447 | |
| 448 | void StoreByte(Register src, const MemOperand& mem, Register scratch); |
| 449 | |
| 450 | void LoadRepresentation(Register dst, const MemOperand& mem, Representation r, |
| 451 | Register scratch = no_reg); |
| 452 | |
| 453 | void StoreRepresentation(Register src, const MemOperand& mem, |
| 454 | Representation r, Register scratch = no_reg); |
| 455 | |
| 456 | // Move values between integer and floating point registers. |
| 457 | void MovIntToDouble(DoubleRegister dst, Register src, Register scratch); |
| 458 | void MovUnsignedIntToDouble(DoubleRegister dst, Register src, |
| 459 | Register scratch); |
| 460 | void MovInt64ToDouble(DoubleRegister dst, |
| 461 | #if !V8_TARGET_ARCH_PPC64 |
| 462 | Register src_hi, |
| 463 | #endif |
| 464 | Register src); |
| 465 | #if V8_TARGET_ARCH_PPC64 |
| 466 | void MovInt64ComponentsToDouble(DoubleRegister dst, Register src_hi, |
| 467 | Register src_lo, Register scratch); |
| 468 | #endif |
| 469 | void MovDoubleLowToInt(Register dst, DoubleRegister src); |
| 470 | void MovDoubleHighToInt(Register dst, DoubleRegister src); |
| 471 | void MovDoubleToInt64( |
| 472 | #if !V8_TARGET_ARCH_PPC64 |
| 473 | Register dst_hi, |
| 474 | #endif |
| 475 | Register dst, DoubleRegister src); |
| 476 | |
| 477 | void Add(Register dst, Register src, intptr_t value, Register scratch); |
| 478 | void Cmpi(Register src1, const Operand& src2, Register scratch, |
| 479 | CRegister cr = cr7); |
| 480 | void Cmpli(Register src1, const Operand& src2, Register scratch, |
| 481 | CRegister cr = cr7); |
| 482 | void Cmpwi(Register src1, const Operand& src2, Register scratch, |
| 483 | CRegister cr = cr7); |
| 484 | void Cmplwi(Register src1, const Operand& src2, Register scratch, |
| 485 | CRegister cr = cr7); |
| 486 | void And(Register ra, Register rs, const Operand& rb, RCBit rc = LeaveRC); |
| 487 | void Or(Register ra, Register rs, const Operand& rb, RCBit rc = LeaveRC); |
| 488 | void Xor(Register ra, Register rs, const Operand& rb, RCBit rc = LeaveRC); |
| 489 | |
| 490 | void AddSmiLiteral(Register dst, Register src, Smi* smi, Register scratch); |
| 491 | void SubSmiLiteral(Register dst, Register src, Smi* smi, Register scratch); |
| 492 | void CmpSmiLiteral(Register src1, Smi* smi, Register scratch, |
| 493 | CRegister cr = cr7); |
| 494 | void CmplSmiLiteral(Register src1, Smi* smi, Register scratch, |
| 495 | CRegister cr = cr7); |
| 496 | void AndSmiLiteral(Register dst, Register src, Smi* smi, Register scratch, |
| 497 | RCBit rc = LeaveRC); |
| 498 | |
| 499 | // Set new rounding mode RN to FPSCR |
| 500 | void SetRoundingMode(FPRoundingMode RN); |
| 501 | |
| 502 | // reset rounding mode to default (kRoundToNearest) |
| 503 | void ResetRoundingMode(); |
| 504 | |
| 505 | // These exist to provide portability between 32 and 64bit |
| 506 | void LoadP(Register dst, const MemOperand& mem, Register scratch = no_reg); |
| 507 | void StoreP(Register src, const MemOperand& mem, Register scratch = no_reg); |
| 508 | |
| 509 | // --------------------------------------------------------------------------- |
| 510 | // JavaScript invokes |
| 511 | |
| 512 | // Invoke the JavaScript function code by either calling or jumping. |
| 513 | void InvokeCode(Register code, const ParameterCount& expected, |
| 514 | const ParameterCount& actual, InvokeFlag flag, |
| 515 | const CallWrapper& call_wrapper); |
| 516 | |
| 517 | // Invoke the JavaScript function in the given register. Changes the |
| 518 | // current context to the context in the function before invoking. |
| 519 | void InvokeFunction(Register function, const ParameterCount& actual, |
| 520 | InvokeFlag flag, const CallWrapper& call_wrapper); |
| 521 | |
| 522 | void InvokeFunction(Register function, const ParameterCount& expected, |
| 523 | const ParameterCount& actual, InvokeFlag flag, |
| 524 | const CallWrapper& call_wrapper); |
| 525 | |
| 526 | void InvokeFunction(Handle<JSFunction> function, |
| 527 | const ParameterCount& expected, |
| 528 | const ParameterCount& actual, InvokeFlag flag, |
| 529 | const CallWrapper& call_wrapper); |
| 530 | |
| 531 | void IsObjectJSObjectType(Register heap_object, Register map, |
| 532 | Register scratch, Label* fail); |
| 533 | |
| 534 | void IsInstanceJSObjectType(Register map, Register scratch, Label* fail); |
| 535 | |
| 536 | void IsObjectJSStringType(Register object, Register scratch, Label* fail); |
| 537 | |
| 538 | void IsObjectNameType(Register object, Register scratch, Label* fail); |
| 539 | |
| 540 | // --------------------------------------------------------------------------- |
| 541 | // Debugger Support |
| 542 | |
| 543 | void DebugBreak(); |
| 544 | |
| 545 | // --------------------------------------------------------------------------- |
| 546 | // Exception handling |
| 547 | |
| 548 | // Push a new try handler and link into try handler chain. |
| 549 | void PushTryHandler(StackHandler::Kind kind, int handler_index); |
| 550 | |
| 551 | // Unlink the stack handler on top of the stack from the try handler chain. |
| 552 | // Must preserve the result register. |
| 553 | void PopTryHandler(); |
| 554 | |
| 555 | // Passes thrown value to the handler of top of the try handler chain. |
| 556 | void Throw(Register value); |
| 557 | |
| 558 | // Propagates an uncatchable exception to the top of the current JS stack's |
| 559 | // handler chain. |
| 560 | void ThrowUncatchable(Register value); |
| 561 | |
| 562 | // --------------------------------------------------------------------------- |
| 563 | // Inline caching support |
| 564 | |
| 565 | // Generate code for checking access rights - used for security checks |
| 566 | // on access to global objects across environments. The holder register |
| 567 | // is left untouched, whereas both scratch registers are clobbered. |
| 568 | void CheckAccessGlobalProxy(Register holder_reg, Register scratch, |
| 569 | Label* miss); |
| 570 | |
| 571 | void GetNumberHash(Register t0, Register scratch); |
| 572 | |
| 573 | void LoadFromNumberDictionary(Label* miss, Register elements, Register key, |
| 574 | Register result, Register t0, Register t1, |
| 575 | Register t2); |
| 576 | |
| 577 | |
| 578 | inline void MarkCode(NopMarkerTypes type) { nop(type); } |
| 579 | |
| 580 | // Check if the given instruction is a 'type' marker. |
| 581 | // i.e. check if is is a mov r<type>, r<type> (referenced as nop(type)) |
| 582 | // These instructions are generated to mark special location in the code, |
| 583 | // like some special IC code. |
| 584 | static inline bool IsMarkedCode(Instr instr, int type) { |
| 585 | DCHECK((FIRST_IC_MARKER <= type) && (type < LAST_CODE_MARKER)); |
| 586 | return IsNop(instr, type); |
| 587 | } |
| 588 | |
| 589 | |
| 590 | static inline int GetCodeMarker(Instr instr) { |
| 591 | int dst_reg_offset = 12; |
| 592 | int dst_mask = 0xf << dst_reg_offset; |
| 593 | int src_mask = 0xf; |
| 594 | int dst_reg = (instr & dst_mask) >> dst_reg_offset; |
| 595 | int src_reg = instr & src_mask; |
| 596 | uint32_t non_register_mask = ~(dst_mask | src_mask); |
| 597 | uint32_t mov_mask = al | 13 << 21; |
| 598 | |
| 599 | // Return <n> if we have a mov rn rn, else return -1. |
| 600 | int type = ((instr & non_register_mask) == mov_mask) && |
| 601 | (dst_reg == src_reg) && (FIRST_IC_MARKER <= dst_reg) && |
| 602 | (dst_reg < LAST_CODE_MARKER) |
| 603 | ? src_reg |
| 604 | : -1; |
| 605 | DCHECK((type == -1) || |
| 606 | ((FIRST_IC_MARKER <= type) && (type < LAST_CODE_MARKER))); |
| 607 | return type; |
| 608 | } |
| 609 | |
| 610 | |
| 611 | // --------------------------------------------------------------------------- |
| 612 | // Allocation support |
| 613 | |
| 614 | // Allocate an object in new space or old pointer space. The object_size is |
| 615 | // specified either in bytes or in words if the allocation flag SIZE_IN_WORDS |
| 616 | // is passed. If the space is exhausted control continues at the gc_required |
| 617 | // label. The allocated object is returned in result. If the flag |
| 618 | // tag_allocated_object is true the result is tagged as as a heap object. |
| 619 | // All registers are clobbered also when control continues at the gc_required |
| 620 | // label. |
| 621 | void Allocate(int object_size, Register result, Register scratch1, |
| 622 | Register scratch2, Label* gc_required, AllocationFlags flags); |
| 623 | |
| 624 | void Allocate(Register object_size, Register result, Register scratch1, |
| 625 | Register scratch2, Label* gc_required, AllocationFlags flags); |
| 626 | |
| 627 | // Undo allocation in new space. The object passed and objects allocated after |
| 628 | // it will no longer be allocated. The caller must make sure that no pointers |
| 629 | // are left to the object(s) no longer allocated as they would be invalid when |
| 630 | // allocation is undone. |
| 631 | void UndoAllocationInNewSpace(Register object, Register scratch); |
| 632 | |
| 633 | |
| 634 | void AllocateTwoByteString(Register result, Register length, |
| 635 | Register scratch1, Register scratch2, |
| 636 | Register scratch3, Label* gc_required); |
| 637 | void AllocateOneByteString(Register result, Register length, |
| 638 | Register scratch1, Register scratch2, |
| 639 | Register scratch3, Label* gc_required); |
| 640 | void AllocateTwoByteConsString(Register result, Register length, |
| 641 | Register scratch1, Register scratch2, |
| 642 | Label* gc_required); |
| 643 | void AllocateOneByteConsString(Register result, Register length, |
| 644 | Register scratch1, Register scratch2, |
| 645 | Label* gc_required); |
| 646 | void AllocateTwoByteSlicedString(Register result, Register length, |
| 647 | Register scratch1, Register scratch2, |
| 648 | Label* gc_required); |
| 649 | void AllocateOneByteSlicedString(Register result, Register length, |
| 650 | Register scratch1, Register scratch2, |
| 651 | Label* gc_required); |
| 652 | |
| 653 | // Allocates a heap number or jumps to the gc_required label if the young |
| 654 | // space is full and a scavenge is needed. All registers are clobbered also |
| 655 | // when control continues at the gc_required label. |
| 656 | void AllocateHeapNumber(Register result, Register scratch1, Register scratch2, |
| 657 | Register heap_number_map, Label* gc_required, |
| 658 | TaggingMode tagging_mode = TAG_RESULT, |
| 659 | MutableMode mode = IMMUTABLE); |
| 660 | void AllocateHeapNumberWithValue(Register result, DoubleRegister value, |
| 661 | Register scratch1, Register scratch2, |
| 662 | Register heap_number_map, |
| 663 | Label* gc_required); |
| 664 | |
| 665 | // Copies a fixed number of fields of heap objects from src to dst. |
| 666 | void CopyFields(Register dst, Register src, RegList temps, int field_count); |
| 667 | |
| 668 | // Copies a number of bytes from src to dst. All registers are clobbered. On |
| 669 | // exit src and dst will point to the place just after where the last byte was |
| 670 | // read or written and length will be zero. |
| 671 | void CopyBytes(Register src, Register dst, Register length, Register scratch); |
| 672 | |
| 673 | // Initialize fields with filler values. |count| fields starting at |
| 674 | // |start_offset| are overwritten with the value in |filler|. At the end the |
| 675 | // loop, |start_offset| points at the next uninitialized field. |count| is |
| 676 | // assumed to be non-zero. |
| 677 | void InitializeNFieldsWithFiller(Register start_offset, Register count, |
| 678 | Register filler); |
| 679 | |
| 680 | // Initialize fields with filler values. Fields starting at |start_offset| |
| 681 | // not including end_offset are overwritten with the value in |filler|. At |
| 682 | // the end the loop, |start_offset| takes the value of |end_offset|. |
| 683 | void InitializeFieldsWithFiller(Register start_offset, Register end_offset, |
| 684 | Register filler); |
| 685 | |
| 686 | // --------------------------------------------------------------------------- |
| 687 | // Support functions. |
| 688 | |
| 689 | // Try to get function prototype of a function and puts the value in |
| 690 | // the result register. Checks that the function really is a |
| 691 | // function and jumps to the miss label if the fast checks fail. The |
| 692 | // function register will be untouched; the other registers may be |
| 693 | // clobbered. |
| 694 | void TryGetFunctionPrototype(Register function, Register result, |
| 695 | Register scratch, Label* miss, |
| 696 | bool miss_on_bound_function = false); |
| 697 | |
| 698 | // Compare object type for heap object. heap_object contains a non-Smi |
| 699 | // whose object type should be compared with the given type. This both |
| 700 | // sets the flags and leaves the object type in the type_reg register. |
| 701 | // It leaves the map in the map register (unless the type_reg and map register |
| 702 | // are the same register). It leaves the heap object in the heap_object |
| 703 | // register unless the heap_object register is the same register as one of the |
| 704 | // other registers. |
| 705 | // Type_reg can be no_reg. In that case ip is used. |
| 706 | void CompareObjectType(Register heap_object, Register map, Register type_reg, |
| 707 | InstanceType type); |
| 708 | |
| 709 | // Compare object type for heap object. Branch to false_label if type |
| 710 | // is lower than min_type or greater than max_type. |
| 711 | // Load map into the register map. |
| 712 | void CheckObjectTypeRange(Register heap_object, Register map, |
| 713 | InstanceType min_type, InstanceType max_type, |
| 714 | Label* false_label); |
| 715 | |
| 716 | // Compare instance type in a map. map contains a valid map object whose |
| 717 | // object type should be compared with the given type. This both |
| 718 | // sets the flags and leaves the object type in the type_reg register. |
| 719 | void CompareInstanceType(Register map, Register type_reg, InstanceType type); |
| 720 | |
| 721 | |
| 722 | // Check if a map for a JSObject indicates that the object has fast elements. |
| 723 | // Jump to the specified label if it does not. |
| 724 | void CheckFastElements(Register map, Register scratch, Label* fail); |
| 725 | |
| 726 | // Check if a map for a JSObject indicates that the object can have both smi |
| 727 | // and HeapObject elements. Jump to the specified label if it does not. |
| 728 | void CheckFastObjectElements(Register map, Register scratch, Label* fail); |
| 729 | |
| 730 | // Check if a map for a JSObject indicates that the object has fast smi only |
| 731 | // elements. Jump to the specified label if it does not. |
| 732 | void CheckFastSmiElements(Register map, Register scratch, Label* fail); |
| 733 | |
| 734 | // Check to see if maybe_number can be stored as a double in |
| 735 | // FastDoubleElements. If it can, store it at the index specified by key in |
| 736 | // the FastDoubleElements array elements. Otherwise jump to fail. |
| 737 | void StoreNumberToDoubleElements(Register value_reg, Register key_reg, |
| 738 | Register elements_reg, Register scratch1, |
| 739 | DoubleRegister double_scratch, Label* fail, |
| 740 | int elements_offset = 0); |
| 741 | |
| 742 | // Compare an object's map with the specified map and its transitioned |
| 743 | // elements maps if mode is ALLOW_ELEMENT_TRANSITION_MAPS. Condition flags are |
| 744 | // set with result of map compare. If multiple map compares are required, the |
| 745 | // compare sequences branches to early_success. |
| 746 | void CompareMap(Register obj, Register scratch, Handle<Map> map, |
| 747 | Label* early_success); |
| 748 | |
| 749 | // As above, but the map of the object is already loaded into the register |
| 750 | // which is preserved by the code generated. |
| 751 | void CompareMap(Register obj_map, Handle<Map> map, Label* early_success); |
| 752 | |
| 753 | // Check if the map of an object is equal to a specified map and branch to |
| 754 | // label if not. Skip the smi check if not required (object is known to be a |
| 755 | // heap object). If mode is ALLOW_ELEMENT_TRANSITION_MAPS, then also match |
| 756 | // against maps that are ElementsKind transition maps of the specified map. |
| 757 | void CheckMap(Register obj, Register scratch, Handle<Map> map, Label* fail, |
| 758 | SmiCheckType smi_check_type); |
| 759 | |
| 760 | |
| 761 | void CheckMap(Register obj, Register scratch, Heap::RootListIndex index, |
| 762 | Label* fail, SmiCheckType smi_check_type); |
| 763 | |
| 764 | |
| 765 | // Check if the map of an object is equal to a specified map and branch to a |
| 766 | // specified target if equal. Skip the smi check if not required (object is |
| 767 | // known to be a heap object) |
| 768 | void DispatchMap(Register obj, Register scratch, Handle<Map> map, |
| 769 | Handle<Code> success, SmiCheckType smi_check_type); |
| 770 | |
| 771 | |
| 772 | // Compare the object in a register to a value from the root list. |
| 773 | // Uses the ip register as scratch. |
| 774 | void CompareRoot(Register obj, Heap::RootListIndex index); |
| 775 | |
| 776 | |
| 777 | // Load and check the instance type of an object for being a string. |
| 778 | // Loads the type into the second argument register. |
| 779 | // Returns a condition that will be enabled if the object was a string. |
| 780 | Condition IsObjectStringType(Register obj, Register type) { |
| 781 | LoadP(type, FieldMemOperand(obj, HeapObject::kMapOffset)); |
| 782 | lbz(type, FieldMemOperand(type, Map::kInstanceTypeOffset)); |
| 783 | andi(r0, type, Operand(kIsNotStringMask)); |
| 784 | DCHECK_EQ(0, kStringTag); |
| 785 | return eq; |
| 786 | } |
| 787 | |
| 788 | |
| 789 | // Picks out an array index from the hash field. |
| 790 | // Register use: |
| 791 | // hash - holds the index's hash. Clobbered. |
| 792 | // index - holds the overwritten index on exit. |
| 793 | void IndexFromHash(Register hash, Register index); |
| 794 | |
| 795 | // Get the number of least significant bits from a register |
| 796 | void GetLeastBitsFromSmi(Register dst, Register src, int num_least_bits); |
| 797 | void GetLeastBitsFromInt32(Register dst, Register src, int mun_least_bits); |
| 798 | |
| 799 | // Load the value of a smi object into a double register. |
| 800 | void SmiToDouble(DoubleRegister value, Register smi); |
| 801 | |
| 802 | // Check if a double can be exactly represented as a signed 32-bit integer. |
| 803 | // CR_EQ in cr7 is set if true. |
| 804 | void TestDoubleIsInt32(DoubleRegister double_input, Register scratch1, |
| 805 | Register scratch2, DoubleRegister double_scratch); |
| 806 | |
| 807 | // Try to convert a double to a signed 32-bit integer. |
| 808 | // CR_EQ in cr7 is set and result assigned if the conversion is exact. |
| 809 | void TryDoubleToInt32Exact(Register result, DoubleRegister double_input, |
| 810 | Register scratch, DoubleRegister double_scratch); |
| 811 | |
| 812 | // Floor a double and writes the value to the result register. |
| 813 | // Go to exact if the conversion is exact (to be able to test -0), |
| 814 | // fall through calling code if an overflow occurred, else go to done. |
| 815 | // In return, input_high is loaded with high bits of input. |
| 816 | void TryInt32Floor(Register result, DoubleRegister double_input, |
| 817 | Register input_high, Register scratch, |
| 818 | DoubleRegister double_scratch, Label* done, Label* exact); |
| 819 | |
| 820 | // Performs a truncating conversion of a floating point number as used by |
| 821 | // the JS bitwise operations. See ECMA-262 9.5: ToInt32. Goes to 'done' if it |
| 822 | // succeeds, otherwise falls through if result is saturated. On return |
| 823 | // 'result' either holds answer, or is clobbered on fall through. |
| 824 | // |
| 825 | // Only public for the test code in test-code-stubs-arm.cc. |
| 826 | void TryInlineTruncateDoubleToI(Register result, DoubleRegister input, |
| 827 | Label* done); |
| 828 | |
| 829 | // Performs a truncating conversion of a floating point number as used by |
| 830 | // the JS bitwise operations. See ECMA-262 9.5: ToInt32. |
| 831 | // Exits with 'result' holding the answer. |
| 832 | void TruncateDoubleToI(Register result, DoubleRegister double_input); |
| 833 | |
| 834 | // Performs a truncating conversion of a heap number as used by |
| 835 | // the JS bitwise operations. See ECMA-262 9.5: ToInt32. 'result' and 'input' |
| 836 | // must be different registers. Exits with 'result' holding the answer. |
| 837 | void TruncateHeapNumberToI(Register result, Register object); |
| 838 | |
| 839 | // Converts the smi or heap number in object to an int32 using the rules |
| 840 | // for ToInt32 as described in ECMAScript 9.5.: the value is truncated |
| 841 | // and brought into the range -2^31 .. +2^31 - 1. 'result' and 'input' must be |
| 842 | // different registers. |
| 843 | void TruncateNumberToI(Register object, Register result, |
| 844 | Register heap_number_map, Register scratch1, |
| 845 | Label* not_int32); |
| 846 | |
| 847 | // Overflow handling functions. |
| 848 | // Usage: call the appropriate arithmetic function and then call one of the |
| 849 | // flow control functions with the corresponding label. |
| 850 | |
| 851 | // Compute dst = left + right, setting condition codes. dst may be same as |
| 852 | // either left or right (or a unique register). left and right must not be |
| 853 | // the same register. |
| 854 | void AddAndCheckForOverflow(Register dst, Register left, Register right, |
| 855 | Register overflow_dst, Register scratch = r0); |
| 856 | void AddAndCheckForOverflow(Register dst, Register left, intptr_t right, |
| 857 | Register overflow_dst, Register scratch = r0); |
| 858 | |
| 859 | // Compute dst = left - right, setting condition codes. dst may be same as |
| 860 | // either left or right (or a unique register). left and right must not be |
| 861 | // the same register. |
| 862 | void SubAndCheckForOverflow(Register dst, Register left, Register right, |
| 863 | Register overflow_dst, Register scratch = r0); |
| 864 | |
| 865 | void BranchOnOverflow(Label* label) { blt(label, cr0); } |
| 866 | |
| 867 | void BranchOnNoOverflow(Label* label) { bge(label, cr0); } |
| 868 | |
| 869 | void RetOnOverflow(void) { |
| 870 | Label label; |
| 871 | |
| 872 | blt(&label, cr0); |
| 873 | Ret(); |
| 874 | bind(&label); |
| 875 | } |
| 876 | |
| 877 | void RetOnNoOverflow(void) { |
| 878 | Label label; |
| 879 | |
| 880 | bge(&label, cr0); |
| 881 | Ret(); |
| 882 | bind(&label); |
| 883 | } |
| 884 | |
| 885 | // Pushes <count> double values to <location>, starting from d<first>. |
| 886 | void SaveFPRegs(Register location, int first, int count); |
| 887 | |
| 888 | // Pops <count> double values from <location>, starting from d<first>. |
| 889 | void RestoreFPRegs(Register location, int first, int count); |
| 890 | |
| 891 | // --------------------------------------------------------------------------- |
| 892 | // Runtime calls |
| 893 | |
| 894 | // Call a code stub. |
| 895 | void CallStub(CodeStub* stub, TypeFeedbackId ast_id = TypeFeedbackId::None(), |
| 896 | Condition cond = al); |
| 897 | |
| 898 | // Call a code stub. |
| 899 | void TailCallStub(CodeStub* stub, Condition cond = al); |
| 900 | |
| 901 | // Call a runtime routine. |
| 902 | void CallRuntime(const Runtime::Function* f, int num_arguments, |
| 903 | SaveFPRegsMode save_doubles = kDontSaveFPRegs); |
| 904 | void CallRuntimeSaveDoubles(Runtime::FunctionId id) { |
| 905 | const Runtime::Function* function = Runtime::FunctionForId(id); |
| 906 | CallRuntime(function, function->nargs, kSaveFPRegs); |
| 907 | } |
| 908 | |
| 909 | // Convenience function: Same as above, but takes the fid instead. |
| 910 | void CallRuntime(Runtime::FunctionId id, int num_arguments, |
| 911 | SaveFPRegsMode save_doubles = kDontSaveFPRegs) { |
| 912 | CallRuntime(Runtime::FunctionForId(id), num_arguments, save_doubles); |
| 913 | } |
| 914 | |
| 915 | // Convenience function: call an external reference. |
| 916 | void CallExternalReference(const ExternalReference& ext, int num_arguments); |
| 917 | |
| 918 | // Tail call of a runtime routine (jump). |
| 919 | // Like JumpToExternalReference, but also takes care of passing the number |
| 920 | // of parameters. |
| 921 | void TailCallExternalReference(const ExternalReference& ext, |
| 922 | int num_arguments, int result_size); |
| 923 | |
| 924 | // Convenience function: tail call a runtime routine (jump). |
| 925 | void TailCallRuntime(Runtime::FunctionId fid, int num_arguments, |
| 926 | int result_size); |
| 927 | |
| 928 | int CalculateStackPassedWords(int num_reg_arguments, |
| 929 | int num_double_arguments); |
| 930 | |
| 931 | // Before calling a C-function from generated code, align arguments on stack. |
| 932 | // After aligning the frame, non-register arguments must be stored in |
| 933 | // sp[0], sp[4], etc., not pushed. The argument count assumes all arguments |
| 934 | // are word sized. If double arguments are used, this function assumes that |
| 935 | // all double arguments are stored before core registers; otherwise the |
| 936 | // correct alignment of the double values is not guaranteed. |
| 937 | // Some compilers/platforms require the stack to be aligned when calling |
| 938 | // C++ code. |
| 939 | // Needs a scratch register to do some arithmetic. This register will be |
| 940 | // trashed. |
| 941 | void PrepareCallCFunction(int num_reg_arguments, int num_double_registers, |
| 942 | Register scratch); |
| 943 | void PrepareCallCFunction(int num_reg_arguments, Register scratch); |
| 944 | |
| 945 | // There are two ways of passing double arguments on ARM, depending on |
| 946 | // whether soft or hard floating point ABI is used. These functions |
| 947 | // abstract parameter passing for the three different ways we call |
| 948 | // C functions from generated code. |
| 949 | void MovToFloatParameter(DoubleRegister src); |
| 950 | void MovToFloatParameters(DoubleRegister src1, DoubleRegister src2); |
| 951 | void MovToFloatResult(DoubleRegister src); |
| 952 | |
| 953 | // Calls a C function and cleans up the space for arguments allocated |
| 954 | // by PrepareCallCFunction. The called function is not allowed to trigger a |
| 955 | // garbage collection, since that might move the code and invalidate the |
| 956 | // return address (unless this is somehow accounted for by the called |
| 957 | // function). |
| 958 | void CallCFunction(ExternalReference function, int num_arguments); |
| 959 | void CallCFunction(Register function, int num_arguments); |
| 960 | void CallCFunction(ExternalReference function, int num_reg_arguments, |
| 961 | int num_double_arguments); |
| 962 | void CallCFunction(Register function, int num_reg_arguments, |
| 963 | int num_double_arguments); |
| 964 | |
| 965 | void MovFromFloatParameter(DoubleRegister dst); |
| 966 | void MovFromFloatResult(DoubleRegister dst); |
| 967 | |
| 968 | // Calls an API function. Allocates HandleScope, extracts returned value |
| 969 | // from handle and propagates exceptions. Restores context. stack_space |
| 970 | // - space to be unwound on exit (includes the call JS arguments space and |
| 971 | // the additional space allocated for the fast call). |
| 972 | void CallApiFunctionAndReturn(Register function_address, |
| 973 | ExternalReference thunk_ref, int stack_space, |
| 974 | MemOperand return_value_operand, |
| 975 | MemOperand* context_restore_operand); |
| 976 | |
| 977 | // Jump to a runtime routine. |
| 978 | void JumpToExternalReference(const ExternalReference& builtin); |
| 979 | |
| 980 | // Invoke specified builtin JavaScript function. Adds an entry to |
| 981 | // the unresolved list if the name does not resolve. |
| 982 | void InvokeBuiltin(Builtins::JavaScript id, InvokeFlag flag, |
| 983 | const CallWrapper& call_wrapper = NullCallWrapper()); |
| 984 | |
| 985 | // Store the code object for the given builtin in the target register and |
| 986 | // setup the function in r1. |
| 987 | void GetBuiltinEntry(Register target, Builtins::JavaScript id); |
| 988 | |
| 989 | // Store the function for the given builtin in the target register. |
| 990 | void GetBuiltinFunction(Register target, Builtins::JavaScript id); |
| 991 | |
| 992 | Handle<Object> CodeObject() { |
| 993 | DCHECK(!code_object_.is_null()); |
| 994 | return code_object_; |
| 995 | } |
| 996 | |
| 997 | |
| 998 | // Emit code for a truncating division by a constant. The dividend register is |
| 999 | // unchanged and ip gets clobbered. Dividend and result must be different. |
| 1000 | void TruncatingDiv(Register result, Register dividend, int32_t divisor); |
| 1001 | |
| 1002 | // --------------------------------------------------------------------------- |
| 1003 | // StatsCounter support |
| 1004 | |
| 1005 | void SetCounter(StatsCounter* counter, int value, Register scratch1, |
| 1006 | Register scratch2); |
| 1007 | void IncrementCounter(StatsCounter* counter, int value, Register scratch1, |
| 1008 | Register scratch2); |
| 1009 | void DecrementCounter(StatsCounter* counter, int value, Register scratch1, |
| 1010 | Register scratch2); |
| 1011 | |
| 1012 | |
| 1013 | // --------------------------------------------------------------------------- |
| 1014 | // Debugging |
| 1015 | |
| 1016 | // Calls Abort(msg) if the condition cond is not satisfied. |
| 1017 | // Use --debug_code to enable. |
| 1018 | void Assert(Condition cond, BailoutReason reason, CRegister cr = cr7); |
| 1019 | void AssertFastElements(Register elements); |
| 1020 | |
| 1021 | // Like Assert(), but always enabled. |
| 1022 | void Check(Condition cond, BailoutReason reason, CRegister cr = cr7); |
| 1023 | |
| 1024 | // Print a message to stdout and abort execution. |
| 1025 | void Abort(BailoutReason reason); |
| 1026 | |
| 1027 | // Verify restrictions about code generated in stubs. |
| 1028 | void set_generating_stub(bool value) { generating_stub_ = value; } |
| 1029 | bool generating_stub() { return generating_stub_; } |
| 1030 | void set_has_frame(bool value) { has_frame_ = value; } |
| 1031 | bool has_frame() { return has_frame_; } |
| 1032 | inline bool AllowThisStubCall(CodeStub* stub); |
| 1033 | |
| 1034 | // --------------------------------------------------------------------------- |
| 1035 | // Number utilities |
| 1036 | |
| 1037 | // Check whether the value of reg is a power of two and not zero. If not |
| 1038 | // control continues at the label not_power_of_two. If reg is a power of two |
| 1039 | // the register scratch contains the value of (reg - 1) when control falls |
| 1040 | // through. |
| 1041 | void JumpIfNotPowerOfTwoOrZero(Register reg, Register scratch, |
| 1042 | Label* not_power_of_two_or_zero); |
| 1043 | // Check whether the value of reg is a power of two and not zero. |
| 1044 | // Control falls through if it is, with scratch containing the mask |
| 1045 | // value (reg - 1). |
| 1046 | // Otherwise control jumps to the 'zero_and_neg' label if the value of reg is |
| 1047 | // zero or negative, or jumps to the 'not_power_of_two' label if the value is |
| 1048 | // strictly positive but not a power of two. |
| 1049 | void JumpIfNotPowerOfTwoOrZeroAndNeg(Register reg, Register scratch, |
| 1050 | Label* zero_and_neg, |
| 1051 | Label* not_power_of_two); |
| 1052 | |
| 1053 | // --------------------------------------------------------------------------- |
| 1054 | // Bit testing/extraction |
| 1055 | // |
| 1056 | // Bit numbering is such that the least significant bit is bit 0 |
| 1057 | // (for consistency between 32/64-bit). |
| 1058 | |
| 1059 | // Extract consecutive bits (defined by rangeStart - rangeEnd) from src |
| 1060 | // and place them into the least significant bits of dst. |
| 1061 | inline void ExtractBitRange(Register dst, Register src, int rangeStart, |
| 1062 | int rangeEnd, RCBit rc = LeaveRC) { |
| 1063 | DCHECK(rangeStart >= rangeEnd && rangeStart < kBitsPerPointer); |
| 1064 | int rotate = (rangeEnd == 0) ? 0 : kBitsPerPointer - rangeEnd; |
| 1065 | int width = rangeStart - rangeEnd + 1; |
| 1066 | #if V8_TARGET_ARCH_PPC64 |
| 1067 | rldicl(dst, src, rotate, kBitsPerPointer - width, rc); |
| 1068 | #else |
| 1069 | rlwinm(dst, src, rotate, kBitsPerPointer - width, kBitsPerPointer - 1, rc); |
| 1070 | #endif |
| 1071 | } |
| 1072 | |
| 1073 | inline void ExtractBit(Register dst, Register src, uint32_t bitNumber, |
| 1074 | RCBit rc = LeaveRC) { |
| 1075 | ExtractBitRange(dst, src, bitNumber, bitNumber, rc); |
| 1076 | } |
| 1077 | |
| 1078 | // Extract consecutive bits (defined by mask) from src and place them |
| 1079 | // into the least significant bits of dst. |
| 1080 | inline void ExtractBitMask(Register dst, Register src, uintptr_t mask, |
| 1081 | RCBit rc = LeaveRC) { |
| 1082 | int start = kBitsPerPointer - 1; |
| 1083 | int end; |
| 1084 | uintptr_t bit = (1L << start); |
| 1085 | |
| 1086 | while (bit && (mask & bit) == 0) { |
| 1087 | start--; |
| 1088 | bit >>= 1; |
| 1089 | } |
| 1090 | end = start; |
| 1091 | bit >>= 1; |
| 1092 | |
| 1093 | while (bit && (mask & bit)) { |
| 1094 | end--; |
| 1095 | bit >>= 1; |
| 1096 | } |
| 1097 | |
| 1098 | // 1-bits in mask must be contiguous |
| 1099 | DCHECK(bit == 0 || (mask & ((bit << 1) - 1)) == 0); |
| 1100 | |
| 1101 | ExtractBitRange(dst, src, start, end, rc); |
| 1102 | } |
| 1103 | |
| 1104 | // Test single bit in value. |
| 1105 | inline void TestBit(Register value, int bitNumber, Register scratch = r0) { |
| 1106 | ExtractBitRange(scratch, value, bitNumber, bitNumber, SetRC); |
| 1107 | } |
| 1108 | |
| 1109 | // Test consecutive bit range in value. Range is defined by |
| 1110 | // rangeStart - rangeEnd. |
| 1111 | inline void TestBitRange(Register value, int rangeStart, int rangeEnd, |
| 1112 | Register scratch = r0) { |
| 1113 | ExtractBitRange(scratch, value, rangeStart, rangeEnd, SetRC); |
| 1114 | } |
| 1115 | |
| 1116 | // Test consecutive bit range in value. Range is defined by mask. |
| 1117 | inline void TestBitMask(Register value, uintptr_t mask, |
| 1118 | Register scratch = r0) { |
| 1119 | ExtractBitMask(scratch, value, mask, SetRC); |
| 1120 | } |
| 1121 | |
| 1122 | |
| 1123 | // --------------------------------------------------------------------------- |
| 1124 | // Smi utilities |
| 1125 | |
| 1126 | // Shift left by 1 |
| 1127 | void SmiTag(Register reg, RCBit rc = LeaveRC) { SmiTag(reg, reg, rc); } |
| 1128 | void SmiTag(Register dst, Register src, RCBit rc = LeaveRC) { |
| 1129 | ShiftLeftImm(dst, src, Operand(kSmiShift), rc); |
| 1130 | } |
| 1131 | |
| 1132 | #if !V8_TARGET_ARCH_PPC64 |
| 1133 | // Test for overflow < 0: use BranchOnOverflow() or BranchOnNoOverflow(). |
| 1134 | void SmiTagCheckOverflow(Register reg, Register overflow); |
| 1135 | void SmiTagCheckOverflow(Register dst, Register src, Register overflow); |
| 1136 | |
| 1137 | inline void JumpIfNotSmiCandidate(Register value, Register scratch, |
| 1138 | Label* not_smi_label) { |
| 1139 | // High bits must be identical to fit into an Smi |
| 1140 | addis(scratch, value, Operand(0x40000000u >> 16)); |
| 1141 | cmpi(scratch, Operand::Zero()); |
| 1142 | blt(not_smi_label); |
| 1143 | } |
| 1144 | #endif |
| 1145 | inline void TestUnsignedSmiCandidate(Register value, Register scratch) { |
| 1146 | // The test is different for unsigned int values. Since we need |
| 1147 | // the value to be in the range of a positive smi, we can't |
| 1148 | // handle any of the high bits being set in the value. |
| 1149 | TestBitRange(value, kBitsPerPointer - 1, kBitsPerPointer - 1 - kSmiShift, |
| 1150 | scratch); |
| 1151 | } |
| 1152 | inline void JumpIfNotUnsignedSmiCandidate(Register value, Register scratch, |
| 1153 | Label* not_smi_label) { |
| 1154 | TestUnsignedSmiCandidate(value, scratch); |
| 1155 | bne(not_smi_label, cr0); |
| 1156 | } |
| 1157 | |
| 1158 | void SmiUntag(Register reg, RCBit rc = LeaveRC) { SmiUntag(reg, reg, rc); } |
| 1159 | |
| 1160 | void SmiUntag(Register dst, Register src, RCBit rc = LeaveRC) { |
| 1161 | ShiftRightArithImm(dst, src, kSmiShift, rc); |
| 1162 | } |
| 1163 | |
| 1164 | void SmiToPtrArrayOffset(Register dst, Register src) { |
| 1165 | #if V8_TARGET_ARCH_PPC64 |
| 1166 | STATIC_ASSERT(kSmiTag == 0 && kSmiShift > kPointerSizeLog2); |
| 1167 | ShiftRightArithImm(dst, src, kSmiShift - kPointerSizeLog2); |
| 1168 | #else |
| 1169 | STATIC_ASSERT(kSmiTag == 0 && kSmiShift < kPointerSizeLog2); |
| 1170 | ShiftLeftImm(dst, src, Operand(kPointerSizeLog2 - kSmiShift)); |
| 1171 | #endif |
| 1172 | } |
| 1173 | |
| 1174 | void SmiToByteArrayOffset(Register dst, Register src) { SmiUntag(dst, src); } |
| 1175 | |
| 1176 | void SmiToShortArrayOffset(Register dst, Register src) { |
| 1177 | #if V8_TARGET_ARCH_PPC64 |
| 1178 | STATIC_ASSERT(kSmiTag == 0 && kSmiShift > 1); |
| 1179 | ShiftRightArithImm(dst, src, kSmiShift - 1); |
| 1180 | #else |
| 1181 | STATIC_ASSERT(kSmiTag == 0 && kSmiShift == 1); |
| 1182 | if (!dst.is(src)) { |
| 1183 | mr(dst, src); |
| 1184 | } |
| 1185 | #endif |
| 1186 | } |
| 1187 | |
| 1188 | void SmiToIntArrayOffset(Register dst, Register src) { |
| 1189 | #if V8_TARGET_ARCH_PPC64 |
| 1190 | STATIC_ASSERT(kSmiTag == 0 && kSmiShift > 2); |
| 1191 | ShiftRightArithImm(dst, src, kSmiShift - 2); |
| 1192 | #else |
| 1193 | STATIC_ASSERT(kSmiTag == 0 && kSmiShift < 2); |
| 1194 | ShiftLeftImm(dst, src, Operand(2 - kSmiShift)); |
| 1195 | #endif |
| 1196 | } |
| 1197 | |
| 1198 | #define SmiToFloatArrayOffset SmiToIntArrayOffset |
| 1199 | |
| 1200 | void SmiToDoubleArrayOffset(Register dst, Register src) { |
| 1201 | #if V8_TARGET_ARCH_PPC64 |
| 1202 | STATIC_ASSERT(kSmiTag == 0 && kSmiShift > kDoubleSizeLog2); |
| 1203 | ShiftRightArithImm(dst, src, kSmiShift - kDoubleSizeLog2); |
| 1204 | #else |
| 1205 | STATIC_ASSERT(kSmiTag == 0 && kSmiShift < kDoubleSizeLog2); |
| 1206 | ShiftLeftImm(dst, src, Operand(kDoubleSizeLog2 - kSmiShift)); |
| 1207 | #endif |
| 1208 | } |
| 1209 | |
| 1210 | void SmiToArrayOffset(Register dst, Register src, int elementSizeLog2) { |
| 1211 | if (kSmiShift < elementSizeLog2) { |
| 1212 | ShiftLeftImm(dst, src, Operand(elementSizeLog2 - kSmiShift)); |
| 1213 | } else if (kSmiShift > elementSizeLog2) { |
| 1214 | ShiftRightArithImm(dst, src, kSmiShift - elementSizeLog2); |
| 1215 | } else if (!dst.is(src)) { |
| 1216 | mr(dst, src); |
| 1217 | } |
| 1218 | } |
| 1219 | |
| 1220 | void IndexToArrayOffset(Register dst, Register src, int elementSizeLog2, |
| 1221 | bool isSmi) { |
| 1222 | if (isSmi) { |
| 1223 | SmiToArrayOffset(dst, src, elementSizeLog2); |
| 1224 | } else { |
| 1225 | ShiftLeftImm(dst, src, Operand(elementSizeLog2)); |
| 1226 | } |
| 1227 | } |
| 1228 | |
| 1229 | // Untag the source value into destination and jump if source is a smi. |
| 1230 | // Souce and destination can be the same register. |
| 1231 | void UntagAndJumpIfSmi(Register dst, Register src, Label* smi_case); |
| 1232 | |
| 1233 | // Untag the source value into destination and jump if source is not a smi. |
| 1234 | // Souce and destination can be the same register. |
| 1235 | void UntagAndJumpIfNotSmi(Register dst, Register src, Label* non_smi_case); |
| 1236 | |
| 1237 | inline void TestIfSmi(Register value, Register scratch) { |
| 1238 | TestBit(value, 0, scratch); // tst(value, Operand(kSmiTagMask)); |
| 1239 | } |
| 1240 | |
| 1241 | inline void TestIfPositiveSmi(Register value, Register scratch) { |
| 1242 | STATIC_ASSERT((kSmiTagMask | kSmiSignMask) == |
| 1243 | (intptr_t)(1UL << (kBitsPerPointer - 1) | 1)); |
| 1244 | #if V8_TARGET_ARCH_PPC64 |
| 1245 | rldicl(scratch, value, 1, kBitsPerPointer - 2, SetRC); |
| 1246 | #else |
| 1247 | rlwinm(scratch, value, 1, kBitsPerPointer - 2, kBitsPerPointer - 1, SetRC); |
| 1248 | #endif |
| 1249 | } |
| 1250 | |
| 1251 | // Jump the register contains a smi. |
| 1252 | inline void JumpIfSmi(Register value, Label* smi_label) { |
| 1253 | TestIfSmi(value, r0); |
| 1254 | beq(smi_label, cr0); // branch if SMI |
| 1255 | } |
| 1256 | // Jump if either of the registers contain a non-smi. |
| 1257 | inline void JumpIfNotSmi(Register value, Label* not_smi_label) { |
| 1258 | TestIfSmi(value, r0); |
| 1259 | bne(not_smi_label, cr0); |
| 1260 | } |
| 1261 | // Jump if either of the registers contain a non-smi. |
| 1262 | void JumpIfNotBothSmi(Register reg1, Register reg2, Label* on_not_both_smi); |
| 1263 | // Jump if either of the registers contain a smi. |
| 1264 | void JumpIfEitherSmi(Register reg1, Register reg2, Label* on_either_smi); |
| 1265 | |
| 1266 | // Abort execution if argument is a smi, enabled via --debug-code. |
| 1267 | void AssertNotSmi(Register object); |
| 1268 | void AssertSmi(Register object); |
| 1269 | |
| 1270 | |
| 1271 | #if V8_TARGET_ARCH_PPC64 |
| 1272 | inline void TestIfInt32(Register value, Register scratch1, Register scratch2, |
| 1273 | CRegister cr = cr7) { |
| 1274 | // High bits must be identical to fit into an 32-bit integer |
| 1275 | srawi(scratch1, value, 31); |
| 1276 | sradi(scratch2, value, 32); |
| 1277 | cmp(scratch1, scratch2, cr); |
| 1278 | } |
| 1279 | #else |
| 1280 | inline void TestIfInt32(Register hi_word, Register lo_word, Register scratch, |
| 1281 | CRegister cr = cr7) { |
| 1282 | // High bits must be identical to fit into an 32-bit integer |
| 1283 | srawi(scratch, lo_word, 31); |
| 1284 | cmp(scratch, hi_word, cr); |
| 1285 | } |
| 1286 | #endif |
| 1287 | |
| 1288 | // Abort execution if argument is not a string, enabled via --debug-code. |
| 1289 | void AssertString(Register object); |
| 1290 | |
| 1291 | // Abort execution if argument is not a name, enabled via --debug-code. |
| 1292 | void AssertName(Register object); |
| 1293 | |
| 1294 | // Abort execution if argument is not undefined or an AllocationSite, enabled |
| 1295 | // via --debug-code. |
| 1296 | void AssertUndefinedOrAllocationSite(Register object, Register scratch); |
| 1297 | |
| 1298 | // Abort execution if reg is not the root value with the given index, |
| 1299 | // enabled via --debug-code. |
| 1300 | void AssertIsRoot(Register reg, Heap::RootListIndex index); |
| 1301 | |
| 1302 | // --------------------------------------------------------------------------- |
| 1303 | // HeapNumber utilities |
| 1304 | |
| 1305 | void JumpIfNotHeapNumber(Register object, Register heap_number_map, |
| 1306 | Register scratch, Label* on_not_heap_number); |
| 1307 | |
| 1308 | // --------------------------------------------------------------------------- |
| 1309 | // String utilities |
| 1310 | |
| 1311 | // Generate code to do a lookup in the number string cache. If the number in |
| 1312 | // the register object is found in the cache the generated code falls through |
| 1313 | // with the result in the result register. The object and the result register |
| 1314 | // can be the same. If the number is not found in the cache the code jumps to |
| 1315 | // the label not_found with only the content of register object unchanged. |
| 1316 | void LookupNumberStringCache(Register object, Register result, |
| 1317 | Register scratch1, Register scratch2, |
| 1318 | Register scratch3, Label* not_found); |
| 1319 | |
| 1320 | // Checks if both objects are sequential one-byte strings and jumps to label |
| 1321 | // if either is not. Assumes that neither object is a smi. |
| 1322 | void JumpIfNonSmisNotBothSequentialOneByteStrings(Register object1, |
| 1323 | Register object2, |
| 1324 | Register scratch1, |
| 1325 | Register scratch2, |
| 1326 | Label* failure); |
| 1327 | |
| 1328 | // Checks if both objects are sequential one-byte strings and jumps to label |
| 1329 | // if either is not. |
| 1330 | void JumpIfNotBothSequentialOneByteStrings(Register first, Register second, |
| 1331 | Register scratch1, |
| 1332 | Register scratch2, |
| 1333 | Label* not_flat_one_byte_strings); |
| 1334 | |
| 1335 | // Checks if both instance types are sequential one-byte strings and jumps to |
| 1336 | // label if either is not. |
| 1337 | void JumpIfBothInstanceTypesAreNotSequentialOneByte( |
| 1338 | Register first_object_instance_type, Register second_object_instance_type, |
| 1339 | Register scratch1, Register scratch2, Label* failure); |
| 1340 | |
| 1341 | // Check if instance type is sequential one-byte string and jump to label if |
| 1342 | // it is not. |
| 1343 | void JumpIfInstanceTypeIsNotSequentialOneByte(Register type, Register scratch, |
| 1344 | Label* failure); |
| 1345 | |
| 1346 | void JumpIfNotUniqueNameInstanceType(Register reg, Label* not_unique_name); |
| 1347 | |
| 1348 | void EmitSeqStringSetCharCheck(Register string, Register index, |
| 1349 | Register value, uint32_t encoding_mask); |
| 1350 | |
| 1351 | // --------------------------------------------------------------------------- |
| 1352 | // Patching helpers. |
| 1353 | |
| 1354 | // Retrieve/patch the relocated value (lis/ori pair or constant pool load). |
| 1355 | void GetRelocatedValue(Register location, Register result, Register scratch); |
| 1356 | void SetRelocatedValue(Register location, Register scratch, |
| 1357 | Register new_value); |
| 1358 | |
| 1359 | void ClampUint8(Register output_reg, Register input_reg); |
| 1360 | |
| 1361 | // Saturate a value into 8-bit unsigned integer |
| 1362 | // if input_value < 0, output_value is 0 |
| 1363 | // if input_value > 255, output_value is 255 |
| 1364 | // otherwise output_value is the (int)input_value (round to nearest) |
| 1365 | void ClampDoubleToUint8(Register result_reg, DoubleRegister input_reg, |
| 1366 | DoubleRegister temp_double_reg); |
| 1367 | |
| 1368 | |
| 1369 | void LoadInstanceDescriptors(Register map, Register descriptors); |
| 1370 | void EnumLength(Register dst, Register map); |
| 1371 | void NumberOfOwnDescriptors(Register dst, Register map); |
| 1372 | |
| 1373 | template <typename Field> |
| 1374 | void DecodeField(Register dst, Register src) { |
| 1375 | ExtractBitRange(dst, src, Field::kShift + Field::kSize - 1, Field::kShift); |
| 1376 | } |
| 1377 | |
| 1378 | template <typename Field> |
| 1379 | void DecodeField(Register reg) { |
| 1380 | DecodeField<Field>(reg, reg); |
| 1381 | } |
| 1382 | |
| 1383 | template <typename Field> |
| 1384 | void DecodeFieldToSmi(Register dst, Register src) { |
| 1385 | #if V8_TARGET_ARCH_PPC64 |
| 1386 | DecodeField<Field>(dst, src); |
| 1387 | SmiTag(dst); |
| 1388 | #else |
| 1389 | // 32-bit can do this in one instruction: |
| 1390 | int start = Field::kSize + kSmiShift - 1; |
| 1391 | int end = kSmiShift; |
| 1392 | int rotate = kSmiShift - Field::kShift; |
| 1393 | if (rotate < 0) { |
| 1394 | rotate += kBitsPerPointer; |
| 1395 | } |
| 1396 | rlwinm(dst, src, rotate, kBitsPerPointer - start - 1, |
| 1397 | kBitsPerPointer - end - 1); |
| 1398 | #endif |
| 1399 | } |
| 1400 | |
| 1401 | template <typename Field> |
| 1402 | void DecodeFieldToSmi(Register reg) { |
| 1403 | DecodeFieldToSmi<Field>(reg, reg); |
| 1404 | } |
| 1405 | |
| 1406 | // Activation support. |
| 1407 | void EnterFrame(StackFrame::Type type, |
| 1408 | bool load_constant_pool_pointer_reg = false); |
| 1409 | // Returns the pc offset at which the frame ends. |
| 1410 | int LeaveFrame(StackFrame::Type type, int stack_adjustment = 0); |
| 1411 | |
| 1412 | // Expects object in r0 and returns map with validated enum cache |
| 1413 | // in r0. Assumes that any other register can be used as a scratch. |
| 1414 | void CheckEnumCache(Register null_value, Label* call_runtime); |
| 1415 | |
| 1416 | // AllocationMemento support. Arrays may have an associated |
| 1417 | // AllocationMemento object that can be checked for in order to pretransition |
| 1418 | // to another type. |
| 1419 | // On entry, receiver_reg should point to the array object. |
| 1420 | // scratch_reg gets clobbered. |
| 1421 | // If allocation info is present, condition flags are set to eq. |
| 1422 | void TestJSArrayForAllocationMemento(Register receiver_reg, |
| 1423 | Register scratch_reg, |
| 1424 | Label* no_memento_found); |
| 1425 | |
| 1426 | void JumpIfJSArrayHasAllocationMemento(Register receiver_reg, |
| 1427 | Register scratch_reg, |
| 1428 | Label* memento_found) { |
| 1429 | Label no_memento_found; |
| 1430 | TestJSArrayForAllocationMemento(receiver_reg, scratch_reg, |
| 1431 | &no_memento_found); |
| 1432 | beq(memento_found); |
| 1433 | bind(&no_memento_found); |
| 1434 | } |
| 1435 | |
| 1436 | // Jumps to found label if a prototype map has dictionary elements. |
| 1437 | void JumpIfDictionaryInPrototypeChain(Register object, Register scratch0, |
| 1438 | Register scratch1, Label* found); |
| 1439 | |
| 1440 | private: |
| 1441 | static const int kSmiShift = kSmiTagSize + kSmiShiftSize; |
| 1442 | |
| 1443 | void CallCFunctionHelper(Register function, int num_reg_arguments, |
| 1444 | int num_double_arguments); |
| 1445 | |
| 1446 | void Jump(intptr_t target, RelocInfo::Mode rmode, Condition cond = al, |
| 1447 | CRegister cr = cr7); |
| 1448 | |
| 1449 | // Helper functions for generating invokes. |
| 1450 | void InvokePrologue(const ParameterCount& expected, |
| 1451 | const ParameterCount& actual, Handle<Code> code_constant, |
| 1452 | Register code_reg, Label* done, |
| 1453 | bool* definitely_mismatches, InvokeFlag flag, |
| 1454 | const CallWrapper& call_wrapper); |
| 1455 | |
| 1456 | void InitializeNewString(Register string, Register length, |
| 1457 | Heap::RootListIndex map_index, Register scratch1, |
| 1458 | Register scratch2); |
| 1459 | |
| 1460 | // Helper for implementing JumpIfNotInNewSpace and JumpIfInNewSpace. |
| 1461 | void InNewSpace(Register object, Register scratch, |
| 1462 | Condition cond, // eq for new space, ne otherwise. |
| 1463 | Label* branch); |
| 1464 | |
| 1465 | // Helper for finding the mark bits for an address. Afterwards, the |
| 1466 | // bitmap register points at the word with the mark bits and the mask |
| 1467 | // the position of the first bit. Leaves addr_reg unchanged. |
| 1468 | inline void GetMarkBits(Register addr_reg, Register bitmap_reg, |
| 1469 | Register mask_reg); |
| 1470 | |
| 1471 | // Helper for throwing exceptions. Compute a handler address and jump to |
| 1472 | // it. See the implementation for register usage. |
| 1473 | void JumpToHandlerEntry(); |
| 1474 | |
| 1475 | // Compute memory operands for safepoint stack slots. |
| 1476 | static int SafepointRegisterStackIndex(int reg_code); |
| 1477 | MemOperand SafepointRegisterSlot(Register reg); |
| 1478 | MemOperand SafepointRegistersAndDoublesSlot(Register reg); |
| 1479 | |
| 1480 | #if V8_OOL_CONSTANT_POOL |
| 1481 | // Loads the constant pool pointer (kConstantPoolRegister). |
| 1482 | enum CodeObjectAccessMethod { CAN_USE_IP, CONSTRUCT_INTERNAL_REFERENCE }; |
| 1483 | void LoadConstantPoolPointerRegister(CodeObjectAccessMethod access_method, |
| 1484 | int ip_code_entry_delta = 0); |
| 1485 | #endif |
| 1486 | |
| 1487 | bool generating_stub_; |
| 1488 | bool has_frame_; |
| 1489 | // This handle will be patched with the code object on installation. |
| 1490 | Handle<Object> code_object_; |
| 1491 | |
| 1492 | // Needs access to SafepointRegisterStackIndex for compiled frame |
| 1493 | // traversal. |
| 1494 | friend class StandardFrame; |
| 1495 | }; |
| 1496 | |
| 1497 | |
| 1498 | // The code patcher is used to patch (typically) small parts of code e.g. for |
| 1499 | // debugging and other types of instrumentation. When using the code patcher |
| 1500 | // the exact number of bytes specified must be emitted. It is not legal to emit |
| 1501 | // relocation information. If any of these constraints are violated it causes |
| 1502 | // an assertion to fail. |
| 1503 | class CodePatcher { |
| 1504 | public: |
| 1505 | enum FlushICache { FLUSH, DONT_FLUSH }; |
| 1506 | |
| 1507 | CodePatcher(byte* address, int instructions, FlushICache flush_cache = FLUSH); |
| 1508 | virtual ~CodePatcher(); |
| 1509 | |
| 1510 | // Macro assembler to emit code. |
| 1511 | MacroAssembler* masm() { return &masm_; } |
| 1512 | |
| 1513 | // Emit an instruction directly. |
| 1514 | void Emit(Instr instr); |
| 1515 | |
| 1516 | // Emit the condition part of an instruction leaving the rest of the current |
| 1517 | // instruction unchanged. |
| 1518 | void EmitCondition(Condition cond); |
| 1519 | |
| 1520 | private: |
| 1521 | byte* address_; // The address of the code being patched. |
| 1522 | int size_; // Number of bytes of the expected patch size. |
| 1523 | MacroAssembler masm_; // Macro assembler used to generate the code. |
| 1524 | FlushICache flush_cache_; // Whether to flush the I cache after patching. |
| 1525 | }; |
| 1526 | |
| 1527 | |
| 1528 | // ----------------------------------------------------------------------------- |
| 1529 | // Static helper functions. |
| 1530 | |
| 1531 | inline MemOperand ContextOperand(Register context, int index) { |
| 1532 | return MemOperand(context, Context::SlotOffset(index)); |
| 1533 | } |
| 1534 | |
| 1535 | |
| 1536 | inline MemOperand GlobalObjectOperand() { |
| 1537 | return ContextOperand(cp, Context::GLOBAL_OBJECT_INDEX); |
| 1538 | } |
| 1539 | |
| 1540 | |
| 1541 | #ifdef GENERATED_CODE_COVERAGE |
| 1542 | #define CODE_COVERAGE_STRINGIFY(x) #x |
| 1543 | #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x) |
| 1544 | #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__) |
| 1545 | #define ACCESS_MASM(masm) \ |
| 1546 | masm->stop(__FILE_LINE__); \ |
| 1547 | masm-> |
| 1548 | #else |
| 1549 | #define ACCESS_MASM(masm) masm-> |
| 1550 | #endif |
| 1551 | } |
| 1552 | } // namespace v8::internal |
| 1553 | |
| 1554 | #endif // V8_PPC_MACRO_ASSEMBLER_PPC_H_ |