1 // Copyright (c) 1994-2006 Sun Microsystems Inc.
2 // All Rights Reserved.
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
8 // - Redistributions of source code must retain the above copyright notice,
9 // this list of conditions and the following disclaimer.
11 // - Redistribution in binary form must reproduce the above copyright
12 // notice, this list of conditions and the following disclaimer in the
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16 // be used to endorse or promote products derived from this software without
17 // specific prior written permission.
19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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21 // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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24 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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29 // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 // The original source code covered by the above license above has been
32 // modified significantly by Google Inc.
33 // Copyright 2012 the V8 project authors. All rights reserved.
35 #ifndef V8_ASSEMBLER_H_
36 #define V8_ASSEMBLER_H_
40 #include "src/allocation.h"
41 #include "src/builtins.h"
42 #include "src/gdb-jit.h"
43 #include "src/isolate.h"
44 #include "src/runtime.h"
45 #include "src/token.h"
54 // -----------------------------------------------------------------------------
55 // Platform independent assembler base class.
57 class AssemblerBase: public Malloced {
59 AssemblerBase(Isolate* isolate, void* buffer, int buffer_size);
60 virtual ~AssemblerBase();
62 Isolate* isolate() const { return isolate_; }
63 int jit_cookie() const { return jit_cookie_; }
65 bool emit_debug_code() const { return emit_debug_code_; }
66 void set_emit_debug_code(bool value) { emit_debug_code_ = value; }
68 bool serializer_enabled() const { return serializer_enabled_; }
70 bool predictable_code_size() const { return predictable_code_size_; }
71 void set_predictable_code_size(bool value) { predictable_code_size_ = value; }
73 uint64_t enabled_cpu_features() const { return enabled_cpu_features_; }
74 void set_enabled_cpu_features(uint64_t features) {
75 enabled_cpu_features_ = features;
77 bool IsEnabled(CpuFeature f) {
78 return (enabled_cpu_features_ & (static_cast<uint64_t>(1) << f)) != 0;
81 // Overwrite a host NaN with a quiet target NaN. Used by mksnapshot for
82 // cross-snapshotting.
83 static void QuietNaN(HeapObject* nan) { }
85 int pc_offset() const { return static_cast<int>(pc_ - buffer_); }
87 // This function is called when code generation is aborted, so that
88 // the assembler could clean up internal data structures.
89 virtual void AbortedCodeGeneration() { }
91 static const int kMinimalBufferSize = 4*KB;
94 // The buffer into which code and relocation info are generated. It could
95 // either be owned by the assembler or be provided externally.
100 // The program counter, which points into the buffer above and moves forward.
106 uint64_t enabled_cpu_features_;
107 bool emit_debug_code_;
108 bool predictable_code_size_;
109 bool serializer_enabled_;
113 // Avoids emitting debug code during the lifetime of this scope object.
114 class DontEmitDebugCodeScope BASE_EMBEDDED {
116 explicit DontEmitDebugCodeScope(AssemblerBase* assembler)
117 : assembler_(assembler), old_value_(assembler->emit_debug_code()) {
118 assembler_->set_emit_debug_code(false);
120 ~DontEmitDebugCodeScope() {
121 assembler_->set_emit_debug_code(old_value_);
124 AssemblerBase* assembler_;
129 // Avoids using instructions that vary in size in unpredictable ways between the
130 // snapshot and the running VM.
131 class PredictableCodeSizeScope {
133 PredictableCodeSizeScope(AssemblerBase* assembler, int expected_size);
134 ~PredictableCodeSizeScope();
137 AssemblerBase* assembler_;
144 // Enable a specified feature within a scope.
145 class CpuFeatureScope BASE_EMBEDDED {
148 CpuFeatureScope(AssemblerBase* assembler, CpuFeature f);
152 AssemblerBase* assembler_;
153 uint64_t old_enabled_;
155 CpuFeatureScope(AssemblerBase* assembler, CpuFeature f) {}
160 // CpuFeatures keeps track of which features are supported by the target CPU.
161 // Supported features must be enabled by a CpuFeatureScope before use.
163 // if (assembler->IsSupported(SSE3)) {
164 // CpuFeatureScope fscope(assembler, SSE3);
165 // // Generate code containing SSE3 instructions.
167 // // Generate alternative code.
169 class CpuFeatures : public AllStatic {
171 static void Probe(bool cross_compile) {
172 STATIC_ASSERT(NUMBER_OF_CPU_FEATURES <= kBitsPerInt);
173 if (initialized_) return;
175 ProbeImpl(cross_compile);
178 static bool IsSupported(CpuFeature f) {
179 return (supported_ & (1u << f)) != 0;
182 static inline bool SupportsCrankshaft();
183 static inline bool SupportsSIMD128InCrankshaft();
185 static inline unsigned cache_line_size() {
186 ASSERT(cache_line_size_ != 0);
187 return cache_line_size_;
190 static void PrintTarget();
191 static void PrintFeatures();
194 // Platform-dependent implementation.
195 static void ProbeImpl(bool cross_compile);
197 static unsigned supported_;
198 static unsigned cache_line_size_;
199 static bool initialized_;
200 friend class ExternalReference;
201 DISALLOW_COPY_AND_ASSIGN(CpuFeatures);
205 // -----------------------------------------------------------------------------
206 // Labels represent pc locations; they are typically jump or call targets.
207 // After declaration, a label can be freely used to denote known or (yet)
208 // unknown pc location. Assembler::bind() is used to bind a label to the
209 // current pc. A label can be bound only once.
211 class Label BASE_EMBEDDED {
223 ASSERT(!is_linked());
224 ASSERT(!is_near_linked());
227 INLINE(void Unuse()) { pos_ = 0; }
228 INLINE(void UnuseNear()) { near_link_pos_ = 0; }
230 INLINE(bool is_bound() const) { return pos_ < 0; }
231 INLINE(bool is_unused() const) { return pos_ == 0 && near_link_pos_ == 0; }
232 INLINE(bool is_linked() const) { return pos_ > 0; }
233 INLINE(bool is_near_linked() const) { return near_link_pos_ > 0; }
235 // Returns the position of bound or linked labels. Cannot be used
236 // for unused labels.
238 int near_link_pos() const { return near_link_pos_ - 1; }
241 // pos_ encodes both the binding state (via its sign)
242 // and the binding position (via its value) of a label.
244 // pos_ < 0 bound label, pos() returns the jump target position
245 // pos_ == 0 unused label
246 // pos_ > 0 linked label, pos() returns the last reference position
249 // Behaves like |pos_| in the "> 0" case, but for near jumps to this label.
252 void bind_to(int pos) {
256 void link_to(int pos, Distance distance = kFar) {
257 if (distance == kNear) {
258 near_link_pos_ = pos + 1;
259 ASSERT(is_near_linked());
266 friend class Assembler;
267 friend class Displacement;
268 friend class RegExpMacroAssemblerIrregexp;
270 #if V8_TARGET_ARCH_ARM64
271 // On ARM64, the Assembler keeps track of pointers to Labels to resolve
272 // branches to distant targets. Copying labels would confuse the Assembler.
273 DISALLOW_COPY_AND_ASSIGN(Label); // NOLINT
278 enum SaveFPRegsMode { kDontSaveFPRegs, kSaveFPRegs };
280 // Specifies whether to perform icache flush operations on RelocInfo updates.
281 // If FLUSH_ICACHE_IF_NEEDED, the icache will always be flushed if an
282 // instruction was modified. If SKIP_ICACHE_FLUSH the flush will always be
283 // skipped (only use this if you will flush the icache manually before it is
285 enum ICacheFlushMode { FLUSH_ICACHE_IF_NEEDED, SKIP_ICACHE_FLUSH };
287 // -----------------------------------------------------------------------------
288 // Relocation information
291 // Relocation information consists of the address (pc) of the datum
292 // to which the relocation information applies, the relocation mode
293 // (rmode), and an optional data field. The relocation mode may be
294 // "descriptive" and not indicate a need for relocation, but simply
295 // describe a property of the datum. Such rmodes are useful for GC
296 // and nice disassembly output.
300 // The constant kNoPosition is used with the collecting of source positions
301 // in the relocation information. Two types of source positions are collected
302 // "position" (RelocMode position) and "statement position" (RelocMode
303 // statement_position). The "position" is collected at places in the source
304 // code which are of interest when making stack traces to pin-point the source
305 // location of a stack frame as close as possible. The "statement position" is
306 // collected at the beginning at each statement, and is used to indicate
307 // possible break locations. kNoPosition is used to indicate an
308 // invalid/uninitialized position value.
309 static const int kNoPosition = -1;
311 // This string is used to add padding comments to the reloc info in cases
312 // where we are not sure to have enough space for patching in during
313 // lazy deoptimization. This is the case if we have indirect calls for which
314 // we do not normally record relocation info.
315 static const char* const kFillerCommentString;
317 // The minimum size of a comment is equal to three bytes for the extra tagged
318 // pc + the tag for the data, and kPointerSize for the actual pointer to the
320 static const int kMinRelocCommentSize = 3 + kPointerSize;
322 // The maximum size for a call instruction including pc-jump.
323 static const int kMaxCallSize = 6;
325 // The maximum pc delta that will use the short encoding.
326 static const int kMaxSmallPCDelta;
329 // Please note the order is important (see IsCodeTarget, IsGCRelocMode).
330 CODE_TARGET, // Code target which is not any of the above.
332 CONSTRUCT_CALL, // code target that is a call to a JavaScript constructor.
333 DEBUG_BREAK, // Code target for the debugger statement.
337 // Everything after runtime_entry (inclusive) is not GC'ed.
339 JS_RETURN, // Marks start of the ExitJSFrame code.
341 POSITION, // See comment for kNoPosition above.
342 STATEMENT_POSITION, // See comment for kNoPosition above.
343 DEBUG_BREAK_SLOT, // Additional code inserted for debug break slot.
344 EXTERNAL_REFERENCE, // The address of an external C++ function.
345 INTERNAL_REFERENCE, // An address inside the same function.
347 // Marks constant and veneer pools. Only used on ARM and ARM64.
348 // They use a custom noncompact encoding.
352 // add more as needed
354 NUMBER_OF_MODES, // There are at most 15 modes with noncompact encoding.
355 NONE32, // never recorded 32-bit value
356 NONE64, // never recorded 64-bit value
357 CODE_AGE_SEQUENCE, // Not stored in RelocInfo array, used explictly by
359 FIRST_REAL_RELOC_MODE = CODE_TARGET,
360 LAST_REAL_RELOC_MODE = VENEER_POOL,
361 FIRST_PSEUDO_RELOC_MODE = CODE_AGE_SEQUENCE,
362 LAST_PSEUDO_RELOC_MODE = CODE_AGE_SEQUENCE,
363 LAST_CODE_ENUM = DEBUG_BREAK,
364 LAST_GCED_ENUM = CELL,
365 // Modes <= LAST_COMPACT_ENUM are guaranteed to have compact encoding.
366 LAST_COMPACT_ENUM = CODE_TARGET_WITH_ID,
367 LAST_STANDARD_NONCOMPACT_ENUM = INTERNAL_REFERENCE
372 RelocInfo(byte* pc, Mode rmode, intptr_t data, Code* host)
373 : pc_(pc), rmode_(rmode), data_(data), host_(host) {
375 RelocInfo(byte* pc, double data64)
376 : pc_(pc), rmode_(NONE64), data64_(data64), host_(NULL) {
379 static inline bool IsRealRelocMode(Mode mode) {
380 return mode >= FIRST_REAL_RELOC_MODE &&
381 mode <= LAST_REAL_RELOC_MODE;
383 static inline bool IsPseudoRelocMode(Mode mode) {
384 ASSERT(!IsRealRelocMode(mode));
385 return mode >= FIRST_PSEUDO_RELOC_MODE &&
386 mode <= LAST_PSEUDO_RELOC_MODE;
388 static inline bool IsConstructCall(Mode mode) {
389 return mode == CONSTRUCT_CALL;
391 static inline bool IsCodeTarget(Mode mode) {
392 return mode <= LAST_CODE_ENUM;
394 static inline bool IsEmbeddedObject(Mode mode) {
395 return mode == EMBEDDED_OBJECT;
397 static inline bool IsRuntimeEntry(Mode mode) {
398 return mode == RUNTIME_ENTRY;
400 // Is the relocation mode affected by GC?
401 static inline bool IsGCRelocMode(Mode mode) {
402 return mode <= LAST_GCED_ENUM;
404 static inline bool IsJSReturn(Mode mode) {
405 return mode == JS_RETURN;
407 static inline bool IsComment(Mode mode) {
408 return mode == COMMENT;
410 static inline bool IsConstPool(Mode mode) {
411 return mode == CONST_POOL;
413 static inline bool IsVeneerPool(Mode mode) {
414 return mode == VENEER_POOL;
416 static inline bool IsPosition(Mode mode) {
417 return mode == POSITION || mode == STATEMENT_POSITION;
419 static inline bool IsStatementPosition(Mode mode) {
420 return mode == STATEMENT_POSITION;
422 static inline bool IsExternalReference(Mode mode) {
423 return mode == EXTERNAL_REFERENCE;
425 static inline bool IsInternalReference(Mode mode) {
426 return mode == INTERNAL_REFERENCE;
428 static inline bool IsDebugBreakSlot(Mode mode) {
429 return mode == DEBUG_BREAK_SLOT;
431 static inline bool IsNone(Mode mode) {
432 return mode == NONE32 || mode == NONE64;
434 static inline bool IsCodeAgeSequence(Mode mode) {
435 return mode == CODE_AGE_SEQUENCE;
437 static inline int ModeMask(Mode mode) { return 1 << mode; }
439 // Returns true if the first RelocInfo has the same mode and raw data as the
441 static inline bool IsEqual(RelocInfo first, RelocInfo second) {
442 return first.rmode() == second.rmode() &&
443 (first.rmode() == RelocInfo::NONE64 ?
444 first.raw_data64() == second.raw_data64() :
445 first.data() == second.data());
449 byte* pc() const { return pc_; }
450 void set_pc(byte* pc) { pc_ = pc; }
451 Mode rmode() const { return rmode_; }
452 intptr_t data() const { return data_; }
453 double data64() const { return data64_; }
454 uint64_t raw_data64() {
455 return BitCast<uint64_t>(data64_);
457 Code* host() const { return host_; }
458 void set_host(Code* host) { host_ = host; }
460 // Apply a relocation by delta bytes
461 INLINE(void apply(intptr_t delta,
462 ICacheFlushMode icache_flush_mode =
463 FLUSH_ICACHE_IF_NEEDED));
465 // Is the pointer this relocation info refers to coded like a plain pointer
466 // or is it strange in some way (e.g. relative or patched into a series of
468 bool IsCodedSpecially();
470 // If true, the pointer this relocation info refers to is an entry in the
471 // constant pool, otherwise the pointer is embedded in the instruction stream.
472 bool IsInConstantPool();
474 // Read/modify the code target in the branch/call instruction
475 // this relocation applies to;
476 // can only be called if IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)
477 INLINE(Address target_address());
478 INLINE(void set_target_address(Address target,
479 WriteBarrierMode write_barrier_mode =
480 UPDATE_WRITE_BARRIER,
481 ICacheFlushMode icache_flush_mode =
482 FLUSH_ICACHE_IF_NEEDED));
483 INLINE(Object* target_object());
484 INLINE(Handle<Object> target_object_handle(Assembler* origin));
485 INLINE(void set_target_object(Object* target,
486 WriteBarrierMode write_barrier_mode =
487 UPDATE_WRITE_BARRIER,
488 ICacheFlushMode icache_flush_mode =
489 FLUSH_ICACHE_IF_NEEDED));
490 INLINE(Address target_runtime_entry(Assembler* origin));
491 INLINE(void set_target_runtime_entry(Address target,
492 WriteBarrierMode write_barrier_mode =
493 UPDATE_WRITE_BARRIER,
494 ICacheFlushMode icache_flush_mode =
495 FLUSH_ICACHE_IF_NEEDED));
496 INLINE(Cell* target_cell());
497 INLINE(Handle<Cell> target_cell_handle());
498 INLINE(void set_target_cell(Cell* cell,
499 WriteBarrierMode write_barrier_mode =
500 UPDATE_WRITE_BARRIER,
501 ICacheFlushMode icache_flush_mode =
502 FLUSH_ICACHE_IF_NEEDED));
503 INLINE(Handle<Object> code_age_stub_handle(Assembler* origin));
504 INLINE(Code* code_age_stub());
505 INLINE(void set_code_age_stub(Code* stub,
506 ICacheFlushMode icache_flush_mode =
507 FLUSH_ICACHE_IF_NEEDED));
509 // Returns the address of the constant pool entry where the target address
510 // is held. This should only be called if IsInConstantPool returns true.
511 INLINE(Address constant_pool_entry_address());
513 // Read the address of the word containing the target_address in an
514 // instruction stream. What this means exactly is architecture-independent.
515 // The only architecture-independent user of this function is the serializer.
516 // The serializer uses it to find out how many raw bytes of instruction to
517 // output before the next target. Architecture-independent code shouldn't
518 // dereference the pointer it gets back from this.
519 INLINE(Address target_address_address());
521 // This indicates how much space a target takes up when deserializing a code
522 // stream. For most architectures this is just the size of a pointer. For
523 // an instruction like movw/movt where the target bits are mixed into the
524 // instruction bits the size of the target will be zero, indicating that the
525 // serializer should not step forwards in memory after a target is resolved
526 // and written. In this case the target_address_address function above
527 // should return the end of the instructions to be patched, allowing the
528 // deserializer to deserialize the instructions as raw bytes and put them in
529 // place, ready to be patched with the target.
530 INLINE(int target_address_size());
532 // Read/modify the reference in the instruction this relocation
533 // applies to; can only be called if rmode_ is external_reference
534 INLINE(Address target_reference());
536 // Read/modify the address of a call instruction. This is used to relocate
537 // the break points where straight-line code is patched with a call
539 INLINE(Address call_address());
540 INLINE(void set_call_address(Address target));
541 INLINE(Object* call_object());
542 INLINE(void set_call_object(Object* target));
543 INLINE(Object** call_object_address());
545 // Wipe out a relocation to a fixed value, used for making snapshots
547 INLINE(void WipeOut());
549 template<typename StaticVisitor> inline void Visit(Heap* heap);
550 inline void Visit(Isolate* isolate, ObjectVisitor* v);
552 // Patch the code with some other code.
553 void PatchCode(byte* instructions, int instruction_count);
555 // Patch the code with a call.
556 void PatchCodeWithCall(Address target, int guard_bytes);
558 // Check whether this return sequence has been patched
559 // with a call to the debugger.
560 INLINE(bool IsPatchedReturnSequence());
562 // Check whether this debug break slot has been patched with a call to the
564 INLINE(bool IsPatchedDebugBreakSlotSequence());
567 // Check whether the given code contains relocation information that
568 // either is position-relative or movable by the garbage collector.
569 static bool RequiresRelocation(const CodeDesc& desc);
572 #ifdef ENABLE_DISASSEMBLER
574 static const char* RelocModeName(Mode rmode);
575 void Print(Isolate* isolate, FILE* out);
576 #endif // ENABLE_DISASSEMBLER
578 void Verify(Isolate* isolate);
581 static const int kCodeTargetMask = (1 << (LAST_CODE_ENUM + 1)) - 1;
582 static const int kPositionMask = 1 << POSITION | 1 << STATEMENT_POSITION;
583 static const int kDataMask =
584 (1 << CODE_TARGET_WITH_ID) | kPositionMask | (1 << COMMENT);
585 static const int kApplyMask; // Modes affected by apply. Depends on arch.
588 // On ARM, note that pc_ is the address of the constant pool entry
589 // to be relocated and not the address of the instruction
590 // referencing the constant pool entry (except when rmode_ ==
599 // External-reference pointers are also split across instruction-pairs
600 // on some platforms, but are accessed via indirect pointers. This location
601 // provides a place for that pointer to exist naturally. Its address
602 // is returned by RelocInfo::target_reference_address().
603 Address reconstructed_adr_ptr_;
604 friend class RelocIterator;
608 // RelocInfoWriter serializes a stream of relocation info. It writes towards
610 class RelocInfoWriter BASE_EMBEDDED {
612 RelocInfoWriter() : pos_(NULL),
616 RelocInfoWriter(byte* pos, byte* pc) : pos_(pos),
621 byte* pos() const { return pos_; }
622 byte* last_pc() const { return last_pc_; }
624 void Write(const RelocInfo* rinfo);
626 // Update the state of the stream after reloc info buffer
627 // and/or code is moved while the stream is active.
628 void Reposition(byte* pos, byte* pc) {
633 // Max size (bytes) of a written RelocInfo. Longest encoding is
634 // ExtraTag, VariableLengthPCJump, ExtraTag, pc_delta, ExtraTag, data_delta.
635 // On ia32 and arm this is 1 + 4 + 1 + 1 + 1 + 4 = 12.
636 // On x64 this is 1 + 4 + 1 + 1 + 1 + 8 == 16;
637 // Here we use the maximum of the two.
638 static const int kMaxSize = 16;
641 inline uint32_t WriteVariableLengthPCJump(uint32_t pc_delta);
642 inline void WriteTaggedPC(uint32_t pc_delta, int tag);
643 inline void WriteExtraTaggedPC(uint32_t pc_delta, int extra_tag);
644 inline void WriteExtraTaggedIntData(int data_delta, int top_tag);
645 inline void WriteExtraTaggedPoolData(int data, int pool_type);
646 inline void WriteExtraTaggedData(intptr_t data_delta, int top_tag);
647 inline void WriteTaggedData(intptr_t data_delta, int tag);
648 inline void WriteExtraTag(int extra_tag, int top_tag);
654 DISALLOW_COPY_AND_ASSIGN(RelocInfoWriter);
658 // A RelocIterator iterates over relocation information.
661 // for (RelocIterator it(code); !it.done(); it.next()) {
662 // // do something with it.rinfo() here
665 // A mask can be specified to skip unwanted modes.
666 class RelocIterator: public Malloced {
668 // Create a new iterator positioned at
669 // the beginning of the reloc info.
670 // Relocation information with mode k is included in the
671 // iteration iff bit k of mode_mask is set.
672 explicit RelocIterator(Code* code, int mode_mask = -1);
673 explicit RelocIterator(const CodeDesc& desc, int mode_mask = -1);
676 bool done() const { return done_; }
679 // Return pointer valid until next next().
686 // Advance* moves the position before/after reading.
687 // *Read* reads from current byte(s) into rinfo_.
688 // *Get* just reads and returns info on current byte.
689 void Advance(int bytes = 1) { pos_ -= bytes; }
694 void AdvanceReadPC();
695 void AdvanceReadId();
696 void AdvanceReadPoolData();
697 void AdvanceReadPosition();
698 void AdvanceReadData();
699 void AdvanceReadVariableLengthPCJump();
700 int GetLocatableTypeTag();
702 void ReadTaggedPosition();
704 // If the given mode is wanted, set it in rinfo_ and return true.
705 // Else return false. Used for efficiently skipping unwanted modes.
706 bool SetMode(RelocInfo::Mode mode) {
707 return (mode_mask_ & (1 << mode)) ? (rinfo_.rmode_ = mode, true) : false;
712 byte* code_age_sequence_;
718 DISALLOW_COPY_AND_ASSIGN(RelocIterator);
722 //------------------------------------------------------------------------------
725 //----------------------------------------------------------------------------
727 class SCTableReference;
731 // An ExternalReference represents a C++ address used in the generated
732 // code. All references to C++ functions and variables must be encapsulated in
733 // an ExternalReference instance. This is done in order to track the origin of
734 // all external references in the code so that they can be bound to the correct
735 // addresses when deserializing a heap.
736 class ExternalReference BASE_EMBEDDED {
738 // Used in the simulator to support different native api calls.
741 // Object* f(v8::internal::Arguments).
742 BUILTIN_CALL, // default
744 // Builtin that takes float arguments and returns an int.
745 // int f(double, double).
746 BUILTIN_COMPARE_CALL,
748 // Builtin call that returns floating point.
749 // double f(double, double).
752 // Builtin call that returns floating point.
756 // Builtin call that returns floating point.
757 // double f(double, int).
760 // Direct call to API function callback.
761 // void f(v8::FunctionCallbackInfo&)
764 // Call to function callback via InvokeFunctionCallback.
765 // void f(v8::FunctionCallbackInfo&, v8::FunctionCallback)
768 // Direct call to accessor getter callback.
769 // void f(Local<String> property, PropertyCallbackInfo& info)
772 // Call to accessor getter callback via InvokeAccessorGetterCallback.
773 // void f(Local<String> property, PropertyCallbackInfo& info,
774 // AccessorGetterCallback callback)
775 PROFILING_GETTER_CALL
779 static void InitializeMathExpData();
780 static void TearDownMathExpData();
782 typedef void* ExternalReferenceRedirector(void* original, Type type);
784 ExternalReference() : address_(NULL) {}
786 ExternalReference(Builtins::CFunctionId id, Isolate* isolate);
788 ExternalReference(ApiFunction* ptr, Type type, Isolate* isolate);
790 ExternalReference(Builtins::Name name, Isolate* isolate);
792 ExternalReference(Runtime::FunctionId id, Isolate* isolate);
794 ExternalReference(const Runtime::Function* f, Isolate* isolate);
796 ExternalReference(const IC_Utility& ic_utility, Isolate* isolate);
798 explicit ExternalReference(StatsCounter* counter);
800 ExternalReference(Isolate::AddressId id, Isolate* isolate);
802 explicit ExternalReference(const SCTableReference& table_ref);
804 // Isolate as an external reference.
805 static ExternalReference isolate_address(Isolate* isolate);
807 // One-of-a-kind references. These references are not part of a general
808 // pattern. This means that they have to be added to the
809 // ExternalReferenceTable in serialize.cc manually.
811 static ExternalReference incremental_marking_record_write_function(
813 static ExternalReference store_buffer_overflow_function(
815 static ExternalReference flush_icache_function(Isolate* isolate);
816 static ExternalReference delete_handle_scope_extensions(Isolate* isolate);
818 static ExternalReference get_date_field_function(Isolate* isolate);
819 static ExternalReference date_cache_stamp(Isolate* isolate);
821 static ExternalReference get_make_code_young_function(Isolate* isolate);
822 static ExternalReference get_mark_code_as_executed_function(Isolate* isolate);
824 // Deoptimization support.
825 static ExternalReference new_deoptimizer_function(Isolate* isolate);
826 static ExternalReference compute_output_frames_function(Isolate* isolate);
829 static ExternalReference log_enter_external_function(Isolate* isolate);
830 static ExternalReference log_leave_external_function(Isolate* isolate);
832 // Static data in the keyed lookup cache.
833 static ExternalReference keyed_lookup_cache_keys(Isolate* isolate);
834 static ExternalReference keyed_lookup_cache_field_offsets(Isolate* isolate);
836 // Static variable Heap::roots_array_start()
837 static ExternalReference roots_array_start(Isolate* isolate);
839 // Static variable Heap::allocation_sites_list_address()
840 static ExternalReference allocation_sites_list_address(Isolate* isolate);
842 // Static variable StackGuard::address_of_jslimit()
843 static ExternalReference address_of_stack_limit(Isolate* isolate);
845 // Static variable StackGuard::address_of_real_jslimit()
846 static ExternalReference address_of_real_stack_limit(Isolate* isolate);
848 // Static variable RegExpStack::limit_address()
849 static ExternalReference address_of_regexp_stack_limit(Isolate* isolate);
851 // Static variables for RegExp.
852 static ExternalReference address_of_static_offsets_vector(Isolate* isolate);
853 static ExternalReference address_of_regexp_stack_memory_address(
855 static ExternalReference address_of_regexp_stack_memory_size(
858 // Static variable Heap::NewSpaceStart()
859 static ExternalReference new_space_start(Isolate* isolate);
860 static ExternalReference new_space_mask(Isolate* isolate);
861 static ExternalReference heap_always_allocate_scope_depth(Isolate* isolate);
862 static ExternalReference new_space_mark_bits(Isolate* isolate);
865 static ExternalReference store_buffer_top(Isolate* isolate);
867 // Used for fast allocation in generated code.
868 static ExternalReference new_space_allocation_top_address(Isolate* isolate);
869 static ExternalReference new_space_allocation_limit_address(Isolate* isolate);
870 static ExternalReference old_pointer_space_allocation_top_address(
872 static ExternalReference old_pointer_space_allocation_limit_address(
874 static ExternalReference old_data_space_allocation_top_address(
876 static ExternalReference old_data_space_allocation_limit_address(
879 static ExternalReference mod_two_doubles_operation(Isolate* isolate);
880 static ExternalReference power_double_double_function(Isolate* isolate);
881 static ExternalReference power_double_int_function(Isolate* isolate);
883 static ExternalReference handle_scope_next_address(Isolate* isolate);
884 static ExternalReference handle_scope_limit_address(Isolate* isolate);
885 static ExternalReference handle_scope_level_address(Isolate* isolate);
887 static ExternalReference scheduled_exception_address(Isolate* isolate);
888 static ExternalReference address_of_pending_message_obj(Isolate* isolate);
889 static ExternalReference address_of_has_pending_message(Isolate* isolate);
890 static ExternalReference address_of_pending_message_script(Isolate* isolate);
892 // Static variables containing common double constants.
893 static ExternalReference address_of_min_int();
894 static ExternalReference address_of_one_half();
895 static ExternalReference address_of_minus_one_half();
896 static ExternalReference address_of_minus_zero();
897 static ExternalReference address_of_zero();
898 static ExternalReference address_of_uint8_max_value();
899 static ExternalReference address_of_negative_infinity();
900 static ExternalReference address_of_canonical_non_hole_nan();
901 static ExternalReference address_of_the_hole_nan();
902 static ExternalReference address_of_uint32_bias();
904 static ExternalReference math_log_double_function(Isolate* isolate);
906 static ExternalReference math_exp_constants(int constant_index);
907 static ExternalReference math_exp_log_table();
909 static ExternalReference page_flags(Page* page);
911 static ExternalReference ForDeoptEntry(Address entry);
913 static ExternalReference cpu_features();
915 static ExternalReference debug_after_break_target_address(Isolate* isolate);
916 static ExternalReference debug_restarter_frame_function_pointer_address(
919 static ExternalReference is_profiling_address(Isolate* isolate);
920 static ExternalReference invoke_function_callback(Isolate* isolate);
921 static ExternalReference invoke_accessor_getter_callback(Isolate* isolate);
923 Address address() const { return reinterpret_cast<Address>(address_); }
925 // Function Debug::Break()
926 static ExternalReference debug_break(Isolate* isolate);
928 // Used to check if single stepping is enabled in generated code.
929 static ExternalReference debug_step_in_fp_address(Isolate* isolate);
931 #ifndef V8_INTERPRETED_REGEXP
932 // C functions called from RegExp generated code.
934 // Function NativeRegExpMacroAssembler::CaseInsensitiveCompareUC16()
935 static ExternalReference re_case_insensitive_compare_uc16(Isolate* isolate);
937 // Function RegExpMacroAssembler*::CheckStackGuardState()
938 static ExternalReference re_check_stack_guard_state(Isolate* isolate);
940 // Function NativeRegExpMacroAssembler::GrowStack()
941 static ExternalReference re_grow_stack(Isolate* isolate);
943 // byte NativeRegExpMacroAssembler::word_character_bitmap
944 static ExternalReference re_word_character_map();
948 // This lets you register a function that rewrites all external references.
949 // Used by the ARM simulator to catch calls to external references.
950 static void set_redirector(Isolate* isolate,
951 ExternalReferenceRedirector* redirector) {
952 // We can't stack them.
953 ASSERT(isolate->external_reference_redirector() == NULL);
954 isolate->set_external_reference_redirector(
955 reinterpret_cast<ExternalReferenceRedirectorPointer*>(redirector));
958 static ExternalReference stress_deopt_count(Isolate* isolate);
960 bool operator==(const ExternalReference& other) const {
961 return address_ == other.address_;
964 bool operator!=(const ExternalReference& other) const {
965 return !(*this == other);
969 explicit ExternalReference(void* address)
970 : address_(address) {}
972 static void* Redirect(Isolate* isolate,
974 Type type = ExternalReference::BUILTIN_CALL) {
975 ExternalReferenceRedirector* redirector =
976 reinterpret_cast<ExternalReferenceRedirector*>(
977 isolate->external_reference_redirector());
978 if (redirector == NULL) return address;
979 void* answer = (*redirector)(address, type);
983 static void* Redirect(Isolate* isolate,
985 Type type = ExternalReference::BUILTIN_CALL) {
986 ExternalReferenceRedirector* redirector =
987 reinterpret_cast<ExternalReferenceRedirector*>(
988 isolate->external_reference_redirector());
989 void* address = reinterpret_cast<void*>(address_arg);
990 void* answer = (redirector == NULL) ?
992 (*redirector)(address, type);
1000 // -----------------------------------------------------------------------------
1001 // Position recording support
1003 struct PositionState {
1004 PositionState() : current_position(RelocInfo::kNoPosition),
1005 written_position(RelocInfo::kNoPosition),
1006 current_statement_position(RelocInfo::kNoPosition),
1007 written_statement_position(RelocInfo::kNoPosition) {}
1009 int current_position;
1010 int written_position;
1012 int current_statement_position;
1013 int written_statement_position;
1017 class PositionsRecorder BASE_EMBEDDED {
1019 explicit PositionsRecorder(Assembler* assembler)
1020 : assembler_(assembler) {
1021 #ifdef ENABLE_GDB_JIT_INTERFACE
1022 gdbjit_lineinfo_ = NULL;
1024 jit_handler_data_ = NULL;
1027 #ifdef ENABLE_GDB_JIT_INTERFACE
1028 ~PositionsRecorder() {
1029 delete gdbjit_lineinfo_;
1032 void StartGDBJITLineInfoRecording() {
1034 gdbjit_lineinfo_ = new GDBJITLineInfo();
1038 GDBJITLineInfo* DetachGDBJITLineInfo() {
1039 GDBJITLineInfo* lineinfo = gdbjit_lineinfo_;
1040 gdbjit_lineinfo_ = NULL; // To prevent deallocation in destructor.
1044 void AttachJITHandlerData(void* user_data) {
1045 jit_handler_data_ = user_data;
1048 void* DetachJITHandlerData() {
1049 void* old_data = jit_handler_data_;
1050 jit_handler_data_ = NULL;
1053 // Set current position to pos.
1054 void RecordPosition(int pos);
1056 // Set current statement position to pos.
1057 void RecordStatementPosition(int pos);
1059 // Write recorded positions to relocation information.
1060 bool WriteRecordedPositions();
1062 int current_position() const { return state_.current_position; }
1064 int current_statement_position() const {
1065 return state_.current_statement_position;
1069 Assembler* assembler_;
1070 PositionState state_;
1071 #ifdef ENABLE_GDB_JIT_INTERFACE
1072 GDBJITLineInfo* gdbjit_lineinfo_;
1075 // Currently jit_handler_data_ is used to store JITHandler-specific data
1076 // over the lifetime of a PositionsRecorder
1077 void* jit_handler_data_;
1078 friend class PreservePositionScope;
1080 DISALLOW_COPY_AND_ASSIGN(PositionsRecorder);
1084 class PreservePositionScope BASE_EMBEDDED {
1086 explicit PreservePositionScope(PositionsRecorder* positions_recorder)
1087 : positions_recorder_(positions_recorder),
1088 saved_state_(positions_recorder->state_) {}
1090 ~PreservePositionScope() {
1091 positions_recorder_->state_ = saved_state_;
1095 PositionsRecorder* positions_recorder_;
1096 const PositionState saved_state_;
1098 DISALLOW_COPY_AND_ASSIGN(PreservePositionScope);
1102 // -----------------------------------------------------------------------------
1103 // Utility functions
1105 inline int NumberOfBitsSet(uint32_t x) {
1106 unsigned int num_bits_set;
1107 for (num_bits_set = 0; x; x >>= 1) {
1108 num_bits_set += x & 1;
1110 return num_bits_set;
1113 bool EvalComparison(Token::Value op, double op1, double op2);
1115 // Computes pow(x, y) with the special cases in the spec for Math.pow.
1116 double power_helper(double x, double y);
1117 double power_double_int(double x, int y);
1118 double power_double_double(double x, double y);
1120 // Helper class for generating code or data associated with the code
1121 // right after a call instruction. As an example this can be used to
1122 // generate safepoint data after calls for crankshaft.
1126 virtual ~CallWrapper() { }
1127 // Called just before emitting a call. Argument is the size of the generated
1129 virtual void BeforeCall(int call_size) const = 0;
1130 // Called just after emitting a call, i.e., at the return site for the call.
1131 virtual void AfterCall() const = 0;
1134 class NullCallWrapper : public CallWrapper {
1136 NullCallWrapper() { }
1137 virtual ~NullCallWrapper() { }
1138 virtual void BeforeCall(int call_size) const { }
1139 virtual void AfterCall() const { }
1143 // The multiplier and shift for signed division via multiplication, see Warren's
1144 // "Hacker's Delight", chapter 10.
1145 class MultiplierAndShift {
1147 explicit MultiplierAndShift(int32_t d);
1148 int32_t multiplier() const { return multiplier_; }
1149 int32_t shift() const { return shift_; }
1152 int32_t multiplier_;
1157 } } // namespace v8::internal
1159 #endif // V8_ASSEMBLER_H_