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
13 // documentation and/or other materials provided with the distribution.
15 // - Neither the name of Sun Microsystems or the names of contributors may
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
20 // IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
21 // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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();
184 static inline unsigned cache_line_size() {
185 ASSERT(cache_line_size_ != 0);
186 return cache_line_size_;
189 static void PrintTarget();
190 static void PrintFeatures();
193 // Platform-dependent implementation.
194 static void ProbeImpl(bool cross_compile);
196 static unsigned supported_;
197 static unsigned cache_line_size_;
198 static bool initialized_;
199 friend class ExternalReference;
200 DISALLOW_COPY_AND_ASSIGN(CpuFeatures);
204 // -----------------------------------------------------------------------------
205 // Labels represent pc locations; they are typically jump or call targets.
206 // After declaration, a label can be freely used to denote known or (yet)
207 // unknown pc location. Assembler::bind() is used to bind a label to the
208 // current pc. A label can be bound only once.
210 class Label BASE_EMBEDDED {
222 ASSERT(!is_linked());
223 ASSERT(!is_near_linked());
226 INLINE(void Unuse()) { pos_ = 0; }
227 INLINE(void UnuseNear()) { near_link_pos_ = 0; }
229 INLINE(bool is_bound() const) { return pos_ < 0; }
230 INLINE(bool is_unused() const) { return pos_ == 0 && near_link_pos_ == 0; }
231 INLINE(bool is_linked() const) { return pos_ > 0; }
232 INLINE(bool is_near_linked() const) { return near_link_pos_ > 0; }
234 // Returns the position of bound or linked labels. Cannot be used
235 // for unused labels.
237 int near_link_pos() const { return near_link_pos_ - 1; }
240 // pos_ encodes both the binding state (via its sign)
241 // and the binding position (via its value) of a label.
243 // pos_ < 0 bound label, pos() returns the jump target position
244 // pos_ == 0 unused label
245 // pos_ > 0 linked label, pos() returns the last reference position
248 // Behaves like |pos_| in the "> 0" case, but for near jumps to this label.
251 void bind_to(int pos) {
255 void link_to(int pos, Distance distance = kFar) {
256 if (distance == kNear) {
257 near_link_pos_ = pos + 1;
258 ASSERT(is_near_linked());
265 friend class Assembler;
266 friend class Displacement;
267 friend class RegExpMacroAssemblerIrregexp;
269 #if V8_TARGET_ARCH_ARM64
270 // On ARM64, the Assembler keeps track of pointers to Labels to resolve
271 // branches to distant targets. Copying labels would confuse the Assembler.
272 DISALLOW_COPY_AND_ASSIGN(Label); // NOLINT
277 enum SaveFPRegsMode { kDontSaveFPRegs, kSaveFPRegs };
279 // Specifies whether to perform icache flush operations on RelocInfo updates.
280 // If FLUSH_ICACHE_IF_NEEDED, the icache will always be flushed if an
281 // instruction was modified. If SKIP_ICACHE_FLUSH the flush will always be
282 // skipped (only use this if you will flush the icache manually before it is
284 enum ICacheFlushMode { FLUSH_ICACHE_IF_NEEDED, SKIP_ICACHE_FLUSH };
286 // -----------------------------------------------------------------------------
287 // Relocation information
290 // Relocation information consists of the address (pc) of the datum
291 // to which the relocation information applies, the relocation mode
292 // (rmode), and an optional data field. The relocation mode may be
293 // "descriptive" and not indicate a need for relocation, but simply
294 // describe a property of the datum. Such rmodes are useful for GC
295 // and nice disassembly output.
299 // The constant kNoPosition is used with the collecting of source positions
300 // in the relocation information. Two types of source positions are collected
301 // "position" (RelocMode position) and "statement position" (RelocMode
302 // statement_position). The "position" is collected at places in the source
303 // code which are of interest when making stack traces to pin-point the source
304 // location of a stack frame as close as possible. The "statement position" is
305 // collected at the beginning at each statement, and is used to indicate
306 // possible break locations. kNoPosition is used to indicate an
307 // invalid/uninitialized position value.
308 static const int kNoPosition = -1;
310 // This string is used to add padding comments to the reloc info in cases
311 // where we are not sure to have enough space for patching in during
312 // lazy deoptimization. This is the case if we have indirect calls for which
313 // we do not normally record relocation info.
314 static const char* const kFillerCommentString;
316 // The minimum size of a comment is equal to three bytes for the extra tagged
317 // pc + the tag for the data, and kPointerSize for the actual pointer to the
319 static const int kMinRelocCommentSize = 3 + kPointerSize;
321 // The maximum size for a call instruction including pc-jump.
322 static const int kMaxCallSize = 6;
324 // The maximum pc delta that will use the short encoding.
325 static const int kMaxSmallPCDelta;
328 // Please note the order is important (see IsCodeTarget, IsGCRelocMode).
329 CODE_TARGET, // Code target which is not any of the above.
331 CONSTRUCT_CALL, // code target that is a call to a JavaScript constructor.
332 DEBUG_BREAK, // Code target for the debugger statement.
336 // Everything after runtime_entry (inclusive) is not GC'ed.
338 JS_RETURN, // Marks start of the ExitJSFrame code.
340 POSITION, // See comment for kNoPosition above.
341 STATEMENT_POSITION, // See comment for kNoPosition above.
342 DEBUG_BREAK_SLOT, // Additional code inserted for debug break slot.
343 EXTERNAL_REFERENCE, // The address of an external C++ function.
344 INTERNAL_REFERENCE, // An address inside the same function.
346 // Marks constant and veneer pools. Only used on ARM and ARM64.
347 // They use a custom noncompact encoding.
351 // add more as needed
353 NUMBER_OF_MODES, // There are at most 15 modes with noncompact encoding.
354 NONE32, // never recorded 32-bit value
355 NONE64, // never recorded 64-bit value
356 CODE_AGE_SEQUENCE, // Not stored in RelocInfo array, used explictly by
358 FIRST_REAL_RELOC_MODE = CODE_TARGET,
359 LAST_REAL_RELOC_MODE = VENEER_POOL,
360 FIRST_PSEUDO_RELOC_MODE = CODE_AGE_SEQUENCE,
361 LAST_PSEUDO_RELOC_MODE = CODE_AGE_SEQUENCE,
362 LAST_CODE_ENUM = DEBUG_BREAK,
363 LAST_GCED_ENUM = CELL,
364 // Modes <= LAST_COMPACT_ENUM are guaranteed to have compact encoding.
365 LAST_COMPACT_ENUM = CODE_TARGET_WITH_ID,
366 LAST_STANDARD_NONCOMPACT_ENUM = INTERNAL_REFERENCE
371 RelocInfo(byte* pc, Mode rmode, intptr_t data, Code* host)
372 : pc_(pc), rmode_(rmode), data_(data), host_(host) {
374 RelocInfo(byte* pc, double data64)
375 : pc_(pc), rmode_(NONE64), data64_(data64), host_(NULL) {
378 static inline bool IsRealRelocMode(Mode mode) {
379 return mode >= FIRST_REAL_RELOC_MODE &&
380 mode <= LAST_REAL_RELOC_MODE;
382 static inline bool IsPseudoRelocMode(Mode mode) {
383 ASSERT(!IsRealRelocMode(mode));
384 return mode >= FIRST_PSEUDO_RELOC_MODE &&
385 mode <= LAST_PSEUDO_RELOC_MODE;
387 static inline bool IsConstructCall(Mode mode) {
388 return mode == CONSTRUCT_CALL;
390 static inline bool IsCodeTarget(Mode mode) {
391 return mode <= LAST_CODE_ENUM;
393 static inline bool IsEmbeddedObject(Mode mode) {
394 return mode == EMBEDDED_OBJECT;
396 static inline bool IsRuntimeEntry(Mode mode) {
397 return mode == RUNTIME_ENTRY;
399 // Is the relocation mode affected by GC?
400 static inline bool IsGCRelocMode(Mode mode) {
401 return mode <= LAST_GCED_ENUM;
403 static inline bool IsJSReturn(Mode mode) {
404 return mode == JS_RETURN;
406 static inline bool IsComment(Mode mode) {
407 return mode == COMMENT;
409 static inline bool IsConstPool(Mode mode) {
410 return mode == CONST_POOL;
412 static inline bool IsVeneerPool(Mode mode) {
413 return mode == VENEER_POOL;
415 static inline bool IsPosition(Mode mode) {
416 return mode == POSITION || mode == STATEMENT_POSITION;
418 static inline bool IsStatementPosition(Mode mode) {
419 return mode == STATEMENT_POSITION;
421 static inline bool IsExternalReference(Mode mode) {
422 return mode == EXTERNAL_REFERENCE;
424 static inline bool IsInternalReference(Mode mode) {
425 return mode == INTERNAL_REFERENCE;
427 static inline bool IsDebugBreakSlot(Mode mode) {
428 return mode == DEBUG_BREAK_SLOT;
430 static inline bool IsNone(Mode mode) {
431 return mode == NONE32 || mode == NONE64;
433 static inline bool IsCodeAgeSequence(Mode mode) {
434 return mode == CODE_AGE_SEQUENCE;
436 static inline int ModeMask(Mode mode) { return 1 << mode; }
438 // Returns true if the first RelocInfo has the same mode and raw data as the
440 static inline bool IsEqual(RelocInfo first, RelocInfo second) {
441 return first.rmode() == second.rmode() &&
442 (first.rmode() == RelocInfo::NONE64 ?
443 first.raw_data64() == second.raw_data64() :
444 first.data() == second.data());
448 byte* pc() const { return pc_; }
449 void set_pc(byte* pc) { pc_ = pc; }
450 Mode rmode() const { return rmode_; }
451 intptr_t data() const { return data_; }
452 double data64() const { return data64_; }
453 uint64_t raw_data64() {
454 return BitCast<uint64_t>(data64_);
456 Code* host() const { return host_; }
457 void set_host(Code* host) { host_ = host; }
459 // Apply a relocation by delta bytes
460 INLINE(void apply(intptr_t delta,
461 ICacheFlushMode icache_flush_mode =
462 FLUSH_ICACHE_IF_NEEDED));
464 // Is the pointer this relocation info refers to coded like a plain pointer
465 // or is it strange in some way (e.g. relative or patched into a series of
467 bool IsCodedSpecially();
469 // If true, the pointer this relocation info refers to is an entry in the
470 // constant pool, otherwise the pointer is embedded in the instruction stream.
471 bool IsInConstantPool();
473 // Read/modify the code target in the branch/call instruction
474 // this relocation applies to;
475 // can only be called if IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_)
476 INLINE(Address target_address());
477 INLINE(void set_target_address(Address target,
478 WriteBarrierMode write_barrier_mode =
479 UPDATE_WRITE_BARRIER,
480 ICacheFlushMode icache_flush_mode =
481 FLUSH_ICACHE_IF_NEEDED));
482 INLINE(Object* target_object());
483 INLINE(Handle<Object> target_object_handle(Assembler* origin));
484 INLINE(void set_target_object(Object* target,
485 WriteBarrierMode write_barrier_mode =
486 UPDATE_WRITE_BARRIER,
487 ICacheFlushMode icache_flush_mode =
488 FLUSH_ICACHE_IF_NEEDED));
489 INLINE(Address target_runtime_entry(Assembler* origin));
490 INLINE(void set_target_runtime_entry(Address target,
491 WriteBarrierMode write_barrier_mode =
492 UPDATE_WRITE_BARRIER,
493 ICacheFlushMode icache_flush_mode =
494 FLUSH_ICACHE_IF_NEEDED));
495 INLINE(Cell* target_cell());
496 INLINE(Handle<Cell> target_cell_handle());
497 INLINE(void set_target_cell(Cell* cell,
498 WriteBarrierMode write_barrier_mode =
499 UPDATE_WRITE_BARRIER,
500 ICacheFlushMode icache_flush_mode =
501 FLUSH_ICACHE_IF_NEEDED));
502 INLINE(Handle<Object> code_age_stub_handle(Assembler* origin));
503 INLINE(Code* code_age_stub());
504 INLINE(void set_code_age_stub(Code* stub,
505 ICacheFlushMode icache_flush_mode =
506 FLUSH_ICACHE_IF_NEEDED));
508 // Returns the address of the constant pool entry where the target address
509 // is held. This should only be called if IsInConstantPool returns true.
510 INLINE(Address constant_pool_entry_address());
512 // Read the address of the word containing the target_address in an
513 // instruction stream. What this means exactly is architecture-independent.
514 // The only architecture-independent user of this function is the serializer.
515 // The serializer uses it to find out how many raw bytes of instruction to
516 // output before the next target. Architecture-independent code shouldn't
517 // dereference the pointer it gets back from this.
518 INLINE(Address target_address_address());
520 // This indicates how much space a target takes up when deserializing a code
521 // stream. For most architectures this is just the size of a pointer. For
522 // an instruction like movw/movt where the target bits are mixed into the
523 // instruction bits the size of the target will be zero, indicating that the
524 // serializer should not step forwards in memory after a target is resolved
525 // and written. In this case the target_address_address function above
526 // should return the end of the instructions to be patched, allowing the
527 // deserializer to deserialize the instructions as raw bytes and put them in
528 // place, ready to be patched with the target.
529 INLINE(int target_address_size());
531 // Read/modify the reference in the instruction this relocation
532 // applies to; can only be called if rmode_ is external_reference
533 INLINE(Address target_reference());
535 // Read/modify the address of a call instruction. This is used to relocate
536 // the break points where straight-line code is patched with a call
538 INLINE(Address call_address());
539 INLINE(void set_call_address(Address target));
540 INLINE(Object* call_object());
541 INLINE(void set_call_object(Object* target));
542 INLINE(Object** call_object_address());
544 // Wipe out a relocation to a fixed value, used for making snapshots
546 INLINE(void WipeOut());
548 template<typename StaticVisitor> inline void Visit(Heap* heap);
549 inline void Visit(Isolate* isolate, ObjectVisitor* v);
551 // Patch the code with some other code.
552 void PatchCode(byte* instructions, int instruction_count);
554 // Patch the code with a call.
555 void PatchCodeWithCall(Address target, int guard_bytes);
557 // Check whether this return sequence has been patched
558 // with a call to the debugger.
559 INLINE(bool IsPatchedReturnSequence());
561 // Check whether this debug break slot has been patched with a call to the
563 INLINE(bool IsPatchedDebugBreakSlotSequence());
566 // Check whether the given code contains relocation information that
567 // either is position-relative or movable by the garbage collector.
568 static bool RequiresRelocation(const CodeDesc& desc);
571 #ifdef ENABLE_DISASSEMBLER
573 static const char* RelocModeName(Mode rmode);
574 void Print(Isolate* isolate, FILE* out);
575 #endif // ENABLE_DISASSEMBLER
577 void Verify(Isolate* isolate);
580 static const int kCodeTargetMask = (1 << (LAST_CODE_ENUM + 1)) - 1;
581 static const int kPositionMask = 1 << POSITION | 1 << STATEMENT_POSITION;
582 static const int kDataMask =
583 (1 << CODE_TARGET_WITH_ID) | kPositionMask | (1 << COMMENT);
584 static const int kApplyMask; // Modes affected by apply. Depends on arch.
587 // On ARM, note that pc_ is the address of the constant pool entry
588 // to be relocated and not the address of the instruction
589 // referencing the constant pool entry (except when rmode_ ==
598 // External-reference pointers are also split across instruction-pairs
599 // on some platforms, but are accessed via indirect pointers. This location
600 // provides a place for that pointer to exist naturally. Its address
601 // is returned by RelocInfo::target_reference_address().
602 Address reconstructed_adr_ptr_;
603 friend class RelocIterator;
607 // RelocInfoWriter serializes a stream of relocation info. It writes towards
609 class RelocInfoWriter BASE_EMBEDDED {
611 RelocInfoWriter() : pos_(NULL),
615 RelocInfoWriter(byte* pos, byte* pc) : pos_(pos),
620 byte* pos() const { return pos_; }
621 byte* last_pc() const { return last_pc_; }
623 void Write(const RelocInfo* rinfo);
625 // Update the state of the stream after reloc info buffer
626 // and/or code is moved while the stream is active.
627 void Reposition(byte* pos, byte* pc) {
632 // Max size (bytes) of a written RelocInfo. Longest encoding is
633 // ExtraTag, VariableLengthPCJump, ExtraTag, pc_delta, ExtraTag, data_delta.
634 // On ia32 and arm this is 1 + 4 + 1 + 1 + 1 + 4 = 12.
635 // On x64 this is 1 + 4 + 1 + 1 + 1 + 8 == 16;
636 // Here we use the maximum of the two.
637 static const int kMaxSize = 16;
640 inline uint32_t WriteVariableLengthPCJump(uint32_t pc_delta);
641 inline void WriteTaggedPC(uint32_t pc_delta, int tag);
642 inline void WriteExtraTaggedPC(uint32_t pc_delta, int extra_tag);
643 inline void WriteExtraTaggedIntData(int data_delta, int top_tag);
644 inline void WriteExtraTaggedPoolData(int data, int pool_type);
645 inline void WriteExtraTaggedData(intptr_t data_delta, int top_tag);
646 inline void WriteTaggedData(intptr_t data_delta, int tag);
647 inline void WriteExtraTag(int extra_tag, int top_tag);
653 DISALLOW_COPY_AND_ASSIGN(RelocInfoWriter);
657 // A RelocIterator iterates over relocation information.
660 // for (RelocIterator it(code); !it.done(); it.next()) {
661 // // do something with it.rinfo() here
664 // A mask can be specified to skip unwanted modes.
665 class RelocIterator: public Malloced {
667 // Create a new iterator positioned at
668 // the beginning of the reloc info.
669 // Relocation information with mode k is included in the
670 // iteration iff bit k of mode_mask is set.
671 explicit RelocIterator(Code* code, int mode_mask = -1);
672 explicit RelocIterator(const CodeDesc& desc, int mode_mask = -1);
675 bool done() const { return done_; }
678 // Return pointer valid until next next().
685 // Advance* moves the position before/after reading.
686 // *Read* reads from current byte(s) into rinfo_.
687 // *Get* just reads and returns info on current byte.
688 void Advance(int bytes = 1) { pos_ -= bytes; }
693 void AdvanceReadPC();
694 void AdvanceReadId();
695 void AdvanceReadPoolData();
696 void AdvanceReadPosition();
697 void AdvanceReadData();
698 void AdvanceReadVariableLengthPCJump();
699 int GetLocatableTypeTag();
701 void ReadTaggedPosition();
703 // If the given mode is wanted, set it in rinfo_ and return true.
704 // Else return false. Used for efficiently skipping unwanted modes.
705 bool SetMode(RelocInfo::Mode mode) {
706 return (mode_mask_ & (1 << mode)) ? (rinfo_.rmode_ = mode, true) : false;
711 byte* code_age_sequence_;
717 DISALLOW_COPY_AND_ASSIGN(RelocIterator);
721 //------------------------------------------------------------------------------
724 //----------------------------------------------------------------------------
726 class SCTableReference;
730 // An ExternalReference represents a C++ address used in the generated
731 // code. All references to C++ functions and variables must be encapsulated in
732 // an ExternalReference instance. This is done in order to track the origin of
733 // all external references in the code so that they can be bound to the correct
734 // addresses when deserializing a heap.
735 class ExternalReference BASE_EMBEDDED {
737 // Used in the simulator to support different native api calls.
740 // Object* f(v8::internal::Arguments).
741 BUILTIN_CALL, // default
743 // Builtin that takes float arguments and returns an int.
744 // int f(double, double).
745 BUILTIN_COMPARE_CALL,
747 // Builtin call that returns floating point.
748 // double f(double, double).
751 // Builtin call that returns floating point.
755 // Builtin call that returns floating point.
756 // double f(double, int).
759 // Direct call to API function callback.
760 // void f(v8::FunctionCallbackInfo&)
763 // Call to function callback via InvokeFunctionCallback.
764 // void f(v8::FunctionCallbackInfo&, v8::FunctionCallback)
767 // Direct call to accessor getter callback.
768 // void f(Local<String> property, PropertyCallbackInfo& info)
771 // Call to accessor getter callback via InvokeAccessorGetterCallback.
772 // void f(Local<String> property, PropertyCallbackInfo& info,
773 // AccessorGetterCallback callback)
774 PROFILING_GETTER_CALL
778 static void InitializeMathExpData();
779 static void TearDownMathExpData();
781 typedef void* ExternalReferenceRedirector(void* original, Type type);
783 ExternalReference() : address_(NULL) {}
785 ExternalReference(Builtins::CFunctionId id, Isolate* isolate);
787 ExternalReference(ApiFunction* ptr, Type type, Isolate* isolate);
789 ExternalReference(Builtins::Name name, Isolate* isolate);
791 ExternalReference(Runtime::FunctionId id, Isolate* isolate);
793 ExternalReference(const Runtime::Function* f, Isolate* isolate);
795 ExternalReference(const IC_Utility& ic_utility, Isolate* isolate);
797 explicit ExternalReference(StatsCounter* counter);
799 ExternalReference(Isolate::AddressId id, Isolate* isolate);
801 explicit ExternalReference(const SCTableReference& table_ref);
803 // Isolate as an external reference.
804 static ExternalReference isolate_address(Isolate* isolate);
806 // One-of-a-kind references. These references are not part of a general
807 // pattern. This means that they have to be added to the
808 // ExternalReferenceTable in serialize.cc manually.
810 static ExternalReference incremental_marking_record_write_function(
812 static ExternalReference store_buffer_overflow_function(
814 static ExternalReference flush_icache_function(Isolate* isolate);
815 static ExternalReference delete_handle_scope_extensions(Isolate* isolate);
817 static ExternalReference get_date_field_function(Isolate* isolate);
818 static ExternalReference date_cache_stamp(Isolate* isolate);
820 static ExternalReference get_make_code_young_function(Isolate* isolate);
821 static ExternalReference get_mark_code_as_executed_function(Isolate* isolate);
823 // Deoptimization support.
824 static ExternalReference new_deoptimizer_function(Isolate* isolate);
825 static ExternalReference compute_output_frames_function(Isolate* isolate);
828 static ExternalReference log_enter_external_function(Isolate* isolate);
829 static ExternalReference log_leave_external_function(Isolate* isolate);
831 // Static data in the keyed lookup cache.
832 static ExternalReference keyed_lookup_cache_keys(Isolate* isolate);
833 static ExternalReference keyed_lookup_cache_field_offsets(Isolate* isolate);
835 // Static variable Heap::roots_array_start()
836 static ExternalReference roots_array_start(Isolate* isolate);
838 // Static variable Heap::allocation_sites_list_address()
839 static ExternalReference allocation_sites_list_address(Isolate* isolate);
841 // Static variable StackGuard::address_of_jslimit()
842 static ExternalReference address_of_stack_limit(Isolate* isolate);
844 // Static variable StackGuard::address_of_real_jslimit()
845 static ExternalReference address_of_real_stack_limit(Isolate* isolate);
847 // Static variable RegExpStack::limit_address()
848 static ExternalReference address_of_regexp_stack_limit(Isolate* isolate);
850 // Static variables for RegExp.
851 static ExternalReference address_of_static_offsets_vector(Isolate* isolate);
852 static ExternalReference address_of_regexp_stack_memory_address(
854 static ExternalReference address_of_regexp_stack_memory_size(
857 // Static variable Heap::NewSpaceStart()
858 static ExternalReference new_space_start(Isolate* isolate);
859 static ExternalReference new_space_mask(Isolate* isolate);
860 static ExternalReference heap_always_allocate_scope_depth(Isolate* isolate);
861 static ExternalReference new_space_mark_bits(Isolate* isolate);
864 static ExternalReference store_buffer_top(Isolate* isolate);
866 // Used for fast allocation in generated code.
867 static ExternalReference new_space_allocation_top_address(Isolate* isolate);
868 static ExternalReference new_space_allocation_limit_address(Isolate* isolate);
869 static ExternalReference old_pointer_space_allocation_top_address(
871 static ExternalReference old_pointer_space_allocation_limit_address(
873 static ExternalReference old_data_space_allocation_top_address(
875 static ExternalReference old_data_space_allocation_limit_address(
878 static ExternalReference mod_two_doubles_operation(Isolate* isolate);
879 static ExternalReference power_double_double_function(Isolate* isolate);
880 static ExternalReference power_double_int_function(Isolate* isolate);
882 static ExternalReference handle_scope_next_address(Isolate* isolate);
883 static ExternalReference handle_scope_limit_address(Isolate* isolate);
884 static ExternalReference handle_scope_level_address(Isolate* isolate);
886 static ExternalReference scheduled_exception_address(Isolate* isolate);
887 static ExternalReference address_of_pending_message_obj(Isolate* isolate);
888 static ExternalReference address_of_has_pending_message(Isolate* isolate);
889 static ExternalReference address_of_pending_message_script(Isolate* isolate);
891 // Static variables containing common double constants.
892 static ExternalReference address_of_min_int();
893 static ExternalReference address_of_one_half();
894 static ExternalReference address_of_minus_one_half();
895 static ExternalReference address_of_minus_zero();
896 static ExternalReference address_of_zero();
897 static ExternalReference address_of_uint8_max_value();
898 static ExternalReference address_of_negative_infinity();
899 static ExternalReference address_of_canonical_non_hole_nan();
900 static ExternalReference address_of_the_hole_nan();
901 static ExternalReference address_of_uint32_bias();
903 static ExternalReference math_log_double_function(Isolate* isolate);
905 static ExternalReference math_exp_constants(int constant_index);
906 static ExternalReference math_exp_log_table();
908 static ExternalReference page_flags(Page* page);
910 static ExternalReference ForDeoptEntry(Address entry);
912 static ExternalReference cpu_features();
914 static ExternalReference debug_after_break_target_address(Isolate* isolate);
915 static ExternalReference debug_restarter_frame_function_pointer_address(
918 static ExternalReference is_profiling_address(Isolate* isolate);
919 static ExternalReference invoke_function_callback(Isolate* isolate);
920 static ExternalReference invoke_accessor_getter_callback(Isolate* isolate);
922 Address address() const { return reinterpret_cast<Address>(address_); }
924 // Function Debug::Break()
925 static ExternalReference debug_break(Isolate* isolate);
927 // Used to check if single stepping is enabled in generated code.
928 static ExternalReference debug_step_in_fp_address(Isolate* isolate);
930 #ifndef V8_INTERPRETED_REGEXP
931 // C functions called from RegExp generated code.
933 // Function NativeRegExpMacroAssembler::CaseInsensitiveCompareUC16()
934 static ExternalReference re_case_insensitive_compare_uc16(Isolate* isolate);
936 // Function RegExpMacroAssembler*::CheckStackGuardState()
937 static ExternalReference re_check_stack_guard_state(Isolate* isolate);
939 // Function NativeRegExpMacroAssembler::GrowStack()
940 static ExternalReference re_grow_stack(Isolate* isolate);
942 // byte NativeRegExpMacroAssembler::word_character_bitmap
943 static ExternalReference re_word_character_map();
947 // This lets you register a function that rewrites all external references.
948 // Used by the ARM simulator to catch calls to external references.
949 static void set_redirector(Isolate* isolate,
950 ExternalReferenceRedirector* redirector) {
951 // We can't stack them.
952 ASSERT(isolate->external_reference_redirector() == NULL);
953 isolate->set_external_reference_redirector(
954 reinterpret_cast<ExternalReferenceRedirectorPointer*>(redirector));
957 static ExternalReference stress_deopt_count(Isolate* isolate);
959 bool operator==(const ExternalReference& other) const {
960 return address_ == other.address_;
963 bool operator!=(const ExternalReference& other) const {
964 return !(*this == other);
968 explicit ExternalReference(void* address)
969 : address_(address) {}
971 static void* Redirect(Isolate* isolate,
973 Type type = ExternalReference::BUILTIN_CALL) {
974 ExternalReferenceRedirector* redirector =
975 reinterpret_cast<ExternalReferenceRedirector*>(
976 isolate->external_reference_redirector());
977 if (redirector == NULL) return address;
978 void* answer = (*redirector)(address, type);
982 static void* Redirect(Isolate* isolate,
984 Type type = ExternalReference::BUILTIN_CALL) {
985 ExternalReferenceRedirector* redirector =
986 reinterpret_cast<ExternalReferenceRedirector*>(
987 isolate->external_reference_redirector());
988 void* address = reinterpret_cast<void*>(address_arg);
989 void* answer = (redirector == NULL) ?
991 (*redirector)(address, type);
999 // -----------------------------------------------------------------------------
1000 // Position recording support
1002 struct PositionState {
1003 PositionState() : current_position(RelocInfo::kNoPosition),
1004 written_position(RelocInfo::kNoPosition),
1005 current_statement_position(RelocInfo::kNoPosition),
1006 written_statement_position(RelocInfo::kNoPosition) {}
1008 int current_position;
1009 int written_position;
1011 int current_statement_position;
1012 int written_statement_position;
1016 class PositionsRecorder BASE_EMBEDDED {
1018 explicit PositionsRecorder(Assembler* assembler)
1019 : assembler_(assembler) {
1020 #ifdef ENABLE_GDB_JIT_INTERFACE
1021 gdbjit_lineinfo_ = NULL;
1023 jit_handler_data_ = NULL;
1026 #ifdef ENABLE_GDB_JIT_INTERFACE
1027 ~PositionsRecorder() {
1028 delete gdbjit_lineinfo_;
1031 void StartGDBJITLineInfoRecording() {
1033 gdbjit_lineinfo_ = new GDBJITLineInfo();
1037 GDBJITLineInfo* DetachGDBJITLineInfo() {
1038 GDBJITLineInfo* lineinfo = gdbjit_lineinfo_;
1039 gdbjit_lineinfo_ = NULL; // To prevent deallocation in destructor.
1043 void AttachJITHandlerData(void* user_data) {
1044 jit_handler_data_ = user_data;
1047 void* DetachJITHandlerData() {
1048 void* old_data = jit_handler_data_;
1049 jit_handler_data_ = NULL;
1052 // Set current position to pos.
1053 void RecordPosition(int pos);
1055 // Set current statement position to pos.
1056 void RecordStatementPosition(int pos);
1058 // Write recorded positions to relocation information.
1059 bool WriteRecordedPositions();
1061 int current_position() const { return state_.current_position; }
1063 int current_statement_position() const {
1064 return state_.current_statement_position;
1068 Assembler* assembler_;
1069 PositionState state_;
1070 #ifdef ENABLE_GDB_JIT_INTERFACE
1071 GDBJITLineInfo* gdbjit_lineinfo_;
1074 // Currently jit_handler_data_ is used to store JITHandler-specific data
1075 // over the lifetime of a PositionsRecorder
1076 void* jit_handler_data_;
1077 friend class PreservePositionScope;
1079 DISALLOW_COPY_AND_ASSIGN(PositionsRecorder);
1083 class PreservePositionScope BASE_EMBEDDED {
1085 explicit PreservePositionScope(PositionsRecorder* positions_recorder)
1086 : positions_recorder_(positions_recorder),
1087 saved_state_(positions_recorder->state_) {}
1089 ~PreservePositionScope() {
1090 positions_recorder_->state_ = saved_state_;
1094 PositionsRecorder* positions_recorder_;
1095 const PositionState saved_state_;
1097 DISALLOW_COPY_AND_ASSIGN(PreservePositionScope);
1101 // -----------------------------------------------------------------------------
1102 // Utility functions
1104 inline int NumberOfBitsSet(uint32_t x) {
1105 unsigned int num_bits_set;
1106 for (num_bits_set = 0; x; x >>= 1) {
1107 num_bits_set += x & 1;
1109 return num_bits_set;
1112 bool EvalComparison(Token::Value op, double op1, double op2);
1114 // Computes pow(x, y) with the special cases in the spec for Math.pow.
1115 double power_helper(double x, double y);
1116 double power_double_int(double x, int y);
1117 double power_double_double(double x, double y);
1119 // Helper class for generating code or data associated with the code
1120 // right after a call instruction. As an example this can be used to
1121 // generate safepoint data after calls for crankshaft.
1125 virtual ~CallWrapper() { }
1126 // Called just before emitting a call. Argument is the size of the generated
1128 virtual void BeforeCall(int call_size) const = 0;
1129 // Called just after emitting a call, i.e., at the return site for the call.
1130 virtual void AfterCall() const = 0;
1133 class NullCallWrapper : public CallWrapper {
1135 NullCallWrapper() { }
1136 virtual ~NullCallWrapper() { }
1137 virtual void BeforeCall(int call_size) const { }
1138 virtual void AfterCall() const { }
1142 // The multiplier and shift for signed division via multiplication, see Warren's
1143 // "Hacker's Delight", chapter 10.
1144 class MultiplierAndShift {
1146 explicit MultiplierAndShift(int32_t d);
1147 int32_t multiplier() const { return multiplier_; }
1148 int32_t shift() const { return shift_; }
1151 int32_t multiplier_;
1156 } } // namespace v8::internal
1158 #endif // V8_ASSEMBLER_H_