| // Copyright (c) 1994-2006 Sun Microsystems Inc. |
| // All Rights Reserved. |
| // |
| // Redistribution and use in source and binary forms, with or without |
| // modification, are permitted provided that the following conditions are |
| // met: |
| // |
| // - Redistributions of source code must retain the above copyright notice, |
| // this list of conditions and the following disclaimer. |
| // |
| // - Redistribution in binary form must reproduce the above copyright |
| // notice, this list of conditions and the following disclaimer in the |
| // documentation and/or other materials provided with the distribution. |
| // |
| // - Neither the name of Sun Microsystems or the names of contributors may |
| // be used to endorse or promote products derived from this software without |
| // specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| // IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| // THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| // PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| // CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| // EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| // PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| // LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| // NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| // SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| // The original source code covered by the above license above has been |
| // modified significantly by Google Inc. |
| // Copyright 2012 the V8 project authors. All rights reserved. |
| |
| #ifndef V8_ASSEMBLER_H_ |
| #define V8_ASSEMBLER_H_ |
| |
| #include "src/v8.h" |
| |
| #include "src/allocation.h" |
| #include "src/builtins.h" |
| #include "src/gdb-jit.h" |
| #include "src/isolate.h" |
| #include "src/runtime.h" |
| #include "src/token.h" |
| |
| namespace v8 { |
| |
| class ApiFunction; |
| |
| namespace internal { |
| |
| class StatsCounter; |
| // ----------------------------------------------------------------------------- |
| // Platform independent assembler base class. |
| |
| class AssemblerBase: public Malloced { |
| public: |
| AssemblerBase(Isolate* isolate, void* buffer, int buffer_size); |
| virtual ~AssemblerBase(); |
| |
| Isolate* isolate() const { return isolate_; } |
| int jit_cookie() const { return jit_cookie_; } |
| |
| bool emit_debug_code() const { return emit_debug_code_; } |
| void set_emit_debug_code(bool value) { emit_debug_code_ = value; } |
| |
| bool serializer_enabled() const { return serializer_enabled_; } |
| void enable_serializer() { serializer_enabled_ = true; } |
| |
| bool predictable_code_size() const { return predictable_code_size_; } |
| void set_predictable_code_size(bool value) { predictable_code_size_ = value; } |
| |
| uint64_t enabled_cpu_features() const { return enabled_cpu_features_; } |
| void set_enabled_cpu_features(uint64_t features) { |
| enabled_cpu_features_ = features; |
| } |
| bool IsEnabled(CpuFeature f) { |
| return (enabled_cpu_features_ & (static_cast<uint64_t>(1) << f)) != 0; |
| } |
| |
| // Overwrite a host NaN with a quiet target NaN. Used by mksnapshot for |
| // cross-snapshotting. |
| static void QuietNaN(HeapObject* nan) { } |
| |
| int pc_offset() const { return static_cast<int>(pc_ - buffer_); } |
| |
| // This function is called when code generation is aborted, so that |
| // the assembler could clean up internal data structures. |
| virtual void AbortedCodeGeneration() { } |
| |
| static const int kMinimalBufferSize = 4*KB; |
| |
| protected: |
| // The buffer into which code and relocation info are generated. It could |
| // either be owned by the assembler or be provided externally. |
| byte* buffer_; |
| int buffer_size_; |
| bool own_buffer_; |
| |
| // The program counter, which points into the buffer above and moves forward. |
| byte* pc_; |
| |
| private: |
| Isolate* isolate_; |
| int jit_cookie_; |
| uint64_t enabled_cpu_features_; |
| bool emit_debug_code_; |
| bool predictable_code_size_; |
| bool serializer_enabled_; |
| }; |
| |
| |
| // Avoids emitting debug code during the lifetime of this scope object. |
| class DontEmitDebugCodeScope BASE_EMBEDDED { |
| public: |
| explicit DontEmitDebugCodeScope(AssemblerBase* assembler) |
| : assembler_(assembler), old_value_(assembler->emit_debug_code()) { |
| assembler_->set_emit_debug_code(false); |
| } |
| ~DontEmitDebugCodeScope() { |
| assembler_->set_emit_debug_code(old_value_); |
| } |
| private: |
| AssemblerBase* assembler_; |
| bool old_value_; |
| }; |
| |
| |
| // Avoids using instructions that vary in size in unpredictable ways between the |
| // snapshot and the running VM. |
| class PredictableCodeSizeScope { |
| public: |
| PredictableCodeSizeScope(AssemblerBase* assembler, int expected_size); |
| ~PredictableCodeSizeScope(); |
| |
| private: |
| AssemblerBase* assembler_; |
| int expected_size_; |
| int start_offset_; |
| bool old_value_; |
| }; |
| |
| |
| // Enable a specified feature within a scope. |
| class CpuFeatureScope BASE_EMBEDDED { |
| public: |
| #ifdef DEBUG |
| CpuFeatureScope(AssemblerBase* assembler, CpuFeature f); |
| ~CpuFeatureScope(); |
| |
| private: |
| AssemblerBase* assembler_; |
| uint64_t old_enabled_; |
| #else |
| CpuFeatureScope(AssemblerBase* assembler, CpuFeature f) {} |
| #endif |
| }; |
| |
| |
| // CpuFeatures keeps track of which features are supported by the target CPU. |
| // Supported features must be enabled by a CpuFeatureScope before use. |
| // Example: |
| // if (assembler->IsSupported(SSE3)) { |
| // CpuFeatureScope fscope(assembler, SSE3); |
| // // Generate code containing SSE3 instructions. |
| // } else { |
| // // Generate alternative code. |
| // } |
| class CpuFeatures : public AllStatic { |
| public: |
| static void Probe(bool cross_compile) { |
| STATIC_ASSERT(NUMBER_OF_CPU_FEATURES <= kBitsPerInt); |
| if (initialized_) return; |
| initialized_ = true; |
| ProbeImpl(cross_compile); |
| } |
| |
| static unsigned SupportedFeatures() { |
| Probe(false); |
| return supported_; |
| } |
| |
| static bool IsSupported(CpuFeature f) { |
| return (supported_ & (1u << f)) != 0; |
| } |
| |
| static inline bool SupportsCrankshaft(); |
| |
| static inline unsigned cache_line_size() { |
| DCHECK(cache_line_size_ != 0); |
| return cache_line_size_; |
| } |
| |
| static void PrintTarget(); |
| static void PrintFeatures(); |
| |
| // Flush instruction cache. |
| static void FlushICache(void* start, size_t size); |
| |
| private: |
| // Platform-dependent implementation. |
| static void ProbeImpl(bool cross_compile); |
| |
| static unsigned supported_; |
| static unsigned cache_line_size_; |
| static bool initialized_; |
| friend class ExternalReference; |
| DISALLOW_COPY_AND_ASSIGN(CpuFeatures); |
| }; |
| |
| |
| // ----------------------------------------------------------------------------- |
| // Labels represent pc locations; they are typically jump or call targets. |
| // After declaration, a label can be freely used to denote known or (yet) |
| // unknown pc location. Assembler::bind() is used to bind a label to the |
| // current pc. A label can be bound only once. |
| |
| class Label BASE_EMBEDDED { |
| public: |
| enum Distance { |
| kNear, kFar |
| }; |
| |
| INLINE(Label()) { |
| Unuse(); |
| UnuseNear(); |
| } |
| |
| INLINE(~Label()) { |
| DCHECK(!is_linked()); |
| DCHECK(!is_near_linked()); |
| } |
| |
| INLINE(void Unuse()) { pos_ = 0; } |
| INLINE(void UnuseNear()) { near_link_pos_ = 0; } |
| |
| INLINE(bool is_bound() const) { return pos_ < 0; } |
| INLINE(bool is_unused() const) { return pos_ == 0 && near_link_pos_ == 0; } |
| INLINE(bool is_linked() const) { return pos_ > 0; } |
| INLINE(bool is_near_linked() const) { return near_link_pos_ > 0; } |
| |
| // Returns the position of bound or linked labels. Cannot be used |
| // for unused labels. |
| int pos() const; |
| int near_link_pos() const { return near_link_pos_ - 1; } |
| |
| private: |
| // pos_ encodes both the binding state (via its sign) |
| // and the binding position (via its value) of a label. |
| // |
| // pos_ < 0 bound label, pos() returns the jump target position |
| // pos_ == 0 unused label |
| // pos_ > 0 linked label, pos() returns the last reference position |
| int pos_; |
| |
| // Behaves like |pos_| in the "> 0" case, but for near jumps to this label. |
| int near_link_pos_; |
| |
| void bind_to(int pos) { |
| pos_ = -pos - 1; |
| DCHECK(is_bound()); |
| } |
| void link_to(int pos, Distance distance = kFar) { |
| if (distance == kNear) { |
| near_link_pos_ = pos + 1; |
| DCHECK(is_near_linked()); |
| } else { |
| pos_ = pos + 1; |
| DCHECK(is_linked()); |
| } |
| } |
| |
| friend class Assembler; |
| friend class Displacement; |
| friend class RegExpMacroAssemblerIrregexp; |
| |
| #if V8_TARGET_ARCH_ARM64 |
| // On ARM64, the Assembler keeps track of pointers to Labels to resolve |
| // branches to distant targets. Copying labels would confuse the Assembler. |
| DISALLOW_COPY_AND_ASSIGN(Label); // NOLINT |
| #endif |
| }; |
| |
| |
| enum SaveFPRegsMode { kDontSaveFPRegs, kSaveFPRegs }; |
| |
| // Specifies whether to perform icache flush operations on RelocInfo updates. |
| // If FLUSH_ICACHE_IF_NEEDED, the icache will always be flushed if an |
| // instruction was modified. If SKIP_ICACHE_FLUSH the flush will always be |
| // skipped (only use this if you will flush the icache manually before it is |
| // executed). |
| enum ICacheFlushMode { FLUSH_ICACHE_IF_NEEDED, SKIP_ICACHE_FLUSH }; |
| |
| // ----------------------------------------------------------------------------- |
| // Relocation information |
| |
| |
| // Relocation information consists of the address (pc) of the datum |
| // to which the relocation information applies, the relocation mode |
| // (rmode), and an optional data field. The relocation mode may be |
| // "descriptive" and not indicate a need for relocation, but simply |
| // describe a property of the datum. Such rmodes are useful for GC |
| // and nice disassembly output. |
| |
| class RelocInfo { |
| public: |
| // The constant kNoPosition is used with the collecting of source positions |
| // in the relocation information. Two types of source positions are collected |
| // "position" (RelocMode position) and "statement position" (RelocMode |
| // statement_position). The "position" is collected at places in the source |
| // code which are of interest when making stack traces to pin-point the source |
| // location of a stack frame as close as possible. The "statement position" is |
| // collected at the beginning at each statement, and is used to indicate |
| // possible break locations. kNoPosition is used to indicate an |
| // invalid/uninitialized position value. |
| static const int kNoPosition = -1; |
| |
| // This string is used to add padding comments to the reloc info in cases |
| // where we are not sure to have enough space for patching in during |
| // lazy deoptimization. This is the case if we have indirect calls for which |
| // we do not normally record relocation info. |
| static const char* const kFillerCommentString; |
| |
| // The minimum size of a comment is equal to three bytes for the extra tagged |
| // pc + the tag for the data, and kPointerSize for the actual pointer to the |
| // comment. |
| static const int kMinRelocCommentSize = 3 + kPointerSize; |
| |
| // The maximum size for a call instruction including pc-jump. |
| static const int kMaxCallSize = 6; |
| |
| // The maximum pc delta that will use the short encoding. |
| static const int kMaxSmallPCDelta; |
| |
| enum Mode { |
| // Please note the order is important (see IsCodeTarget, IsGCRelocMode). |
| CODE_TARGET, // Code target which is not any of the above. |
| CODE_TARGET_WITH_ID, |
| CONSTRUCT_CALL, // code target that is a call to a JavaScript constructor. |
| DEBUG_BREAK, // Code target for the debugger statement. |
| EMBEDDED_OBJECT, |
| CELL, |
| |
| // Everything after runtime_entry (inclusive) is not GC'ed. |
| RUNTIME_ENTRY, |
| JS_RETURN, // Marks start of the ExitJSFrame code. |
| COMMENT, |
| POSITION, // See comment for kNoPosition above. |
| STATEMENT_POSITION, // See comment for kNoPosition above. |
| DEBUG_BREAK_SLOT, // Additional code inserted for debug break slot. |
| EXTERNAL_REFERENCE, // The address of an external C++ function. |
| INTERNAL_REFERENCE, // An address inside the same function. |
| |
| // Marks constant and veneer pools. Only used on ARM and ARM64. |
| // They use a custom noncompact encoding. |
| CONST_POOL, |
| VENEER_POOL, |
| |
| // add more as needed |
| // Pseudo-types |
| NUMBER_OF_MODES, // There are at most 15 modes with noncompact encoding. |
| NONE32, // never recorded 32-bit value |
| NONE64, // never recorded 64-bit value |
| CODE_AGE_SEQUENCE, // Not stored in RelocInfo array, used explictly by |
| // code aging. |
| FIRST_REAL_RELOC_MODE = CODE_TARGET, |
| LAST_REAL_RELOC_MODE = VENEER_POOL, |
| FIRST_PSEUDO_RELOC_MODE = CODE_AGE_SEQUENCE, |
| LAST_PSEUDO_RELOC_MODE = CODE_AGE_SEQUENCE, |
| LAST_CODE_ENUM = DEBUG_BREAK, |
| LAST_GCED_ENUM = CELL, |
| // Modes <= LAST_COMPACT_ENUM are guaranteed to have compact encoding. |
| LAST_COMPACT_ENUM = CODE_TARGET_WITH_ID, |
| LAST_STANDARD_NONCOMPACT_ENUM = INTERNAL_REFERENCE |
| }; |
| |
| RelocInfo() {} |
| |
| RelocInfo(byte* pc, Mode rmode, intptr_t data, Code* host) |
| : pc_(pc), rmode_(rmode), data_(data), host_(host) { |
| } |
| RelocInfo(byte* pc, double data64) |
| : pc_(pc), rmode_(NONE64), data64_(data64), host_(NULL) { |
| } |
| |
| static inline bool IsRealRelocMode(Mode mode) { |
| return mode >= FIRST_REAL_RELOC_MODE && |
| mode <= LAST_REAL_RELOC_MODE; |
| } |
| static inline bool IsPseudoRelocMode(Mode mode) { |
| DCHECK(!IsRealRelocMode(mode)); |
| return mode >= FIRST_PSEUDO_RELOC_MODE && |
| mode <= LAST_PSEUDO_RELOC_MODE; |
| } |
| static inline bool IsConstructCall(Mode mode) { |
| return mode == CONSTRUCT_CALL; |
| } |
| static inline bool IsCodeTarget(Mode mode) { |
| return mode <= LAST_CODE_ENUM; |
| } |
| static inline bool IsEmbeddedObject(Mode mode) { |
| return mode == EMBEDDED_OBJECT; |
| } |
| static inline bool IsRuntimeEntry(Mode mode) { |
| return mode == RUNTIME_ENTRY; |
| } |
| // Is the relocation mode affected by GC? |
| static inline bool IsGCRelocMode(Mode mode) { |
| return mode <= LAST_GCED_ENUM; |
| } |
| static inline bool IsJSReturn(Mode mode) { |
| return mode == JS_RETURN; |
| } |
| static inline bool IsComment(Mode mode) { |
| return mode == COMMENT; |
| } |
| static inline bool IsConstPool(Mode mode) { |
| return mode == CONST_POOL; |
| } |
| static inline bool IsVeneerPool(Mode mode) { |
| return mode == VENEER_POOL; |
| } |
| static inline bool IsPosition(Mode mode) { |
| return mode == POSITION || mode == STATEMENT_POSITION; |
| } |
| static inline bool IsStatementPosition(Mode mode) { |
| return mode == STATEMENT_POSITION; |
| } |
| static inline bool IsExternalReference(Mode mode) { |
| return mode == EXTERNAL_REFERENCE; |
| } |
| static inline bool IsInternalReference(Mode mode) { |
| return mode == INTERNAL_REFERENCE; |
| } |
| static inline bool IsDebugBreakSlot(Mode mode) { |
| return mode == DEBUG_BREAK_SLOT; |
| } |
| static inline bool IsNone(Mode mode) { |
| return mode == NONE32 || mode == NONE64; |
| } |
| static inline bool IsCodeAgeSequence(Mode mode) { |
| return mode == CODE_AGE_SEQUENCE; |
| } |
| static inline int ModeMask(Mode mode) { return 1 << mode; } |
| |
| // Returns true if the first RelocInfo has the same mode and raw data as the |
| // second one. |
| static inline bool IsEqual(RelocInfo first, RelocInfo second) { |
| return first.rmode() == second.rmode() && |
| (first.rmode() == RelocInfo::NONE64 ? |
| first.raw_data64() == second.raw_data64() : |
| first.data() == second.data()); |
| } |
| |
| // Accessors |
| byte* pc() const { return pc_; } |
| void set_pc(byte* pc) { pc_ = pc; } |
| Mode rmode() const { return rmode_; } |
| intptr_t data() const { return data_; } |
| double data64() const { return data64_; } |
| uint64_t raw_data64() { return bit_cast<uint64_t>(data64_); } |
| Code* host() const { return host_; } |
| void set_host(Code* host) { host_ = host; } |
| |
| // Apply a relocation by delta bytes |
| INLINE(void apply(intptr_t delta, |
| ICacheFlushMode icache_flush_mode = |
| FLUSH_ICACHE_IF_NEEDED)); |
| |
| // Is the pointer this relocation info refers to coded like a plain pointer |
| // or is it strange in some way (e.g. relative or patched into a series of |
| // instructions). |
| bool IsCodedSpecially(); |
| |
| // If true, the pointer this relocation info refers to is an entry in the |
| // constant pool, otherwise the pointer is embedded in the instruction stream. |
| bool IsInConstantPool(); |
| |
| // Read/modify the code target in the branch/call instruction |
| // this relocation applies to; |
| // can only be called if IsCodeTarget(rmode_) || IsRuntimeEntry(rmode_) |
| INLINE(Address target_address()); |
| INLINE(void set_target_address(Address target, |
| WriteBarrierMode write_barrier_mode = |
| UPDATE_WRITE_BARRIER, |
| ICacheFlushMode icache_flush_mode = |
| FLUSH_ICACHE_IF_NEEDED)); |
| INLINE(Object* target_object()); |
| INLINE(Handle<Object> target_object_handle(Assembler* origin)); |
| INLINE(void set_target_object(Object* target, |
| WriteBarrierMode write_barrier_mode = |
| UPDATE_WRITE_BARRIER, |
| ICacheFlushMode icache_flush_mode = |
| FLUSH_ICACHE_IF_NEEDED)); |
| INLINE(Address target_runtime_entry(Assembler* origin)); |
| INLINE(void set_target_runtime_entry(Address target, |
| WriteBarrierMode write_barrier_mode = |
| UPDATE_WRITE_BARRIER, |
| ICacheFlushMode icache_flush_mode = |
| FLUSH_ICACHE_IF_NEEDED)); |
| INLINE(Cell* target_cell()); |
| INLINE(Handle<Cell> target_cell_handle()); |
| INLINE(void set_target_cell(Cell* cell, |
| WriteBarrierMode write_barrier_mode = |
| UPDATE_WRITE_BARRIER, |
| ICacheFlushMode icache_flush_mode = |
| FLUSH_ICACHE_IF_NEEDED)); |
| INLINE(Handle<Object> code_age_stub_handle(Assembler* origin)); |
| INLINE(Code* code_age_stub()); |
| INLINE(void set_code_age_stub(Code* stub, |
| ICacheFlushMode icache_flush_mode = |
| FLUSH_ICACHE_IF_NEEDED)); |
| |
| // Returns the address of the constant pool entry where the target address |
| // is held. This should only be called if IsInConstantPool returns true. |
| INLINE(Address constant_pool_entry_address()); |
| |
| // Read the address of the word containing the target_address in an |
| // instruction stream. What this means exactly is architecture-independent. |
| // The only architecture-independent user of this function is the serializer. |
| // The serializer uses it to find out how many raw bytes of instruction to |
| // output before the next target. Architecture-independent code shouldn't |
| // dereference the pointer it gets back from this. |
| INLINE(Address target_address_address()); |
| |
| // This indicates how much space a target takes up when deserializing a code |
| // stream. For most architectures this is just the size of a pointer. For |
| // an instruction like movw/movt where the target bits are mixed into the |
| // instruction bits the size of the target will be zero, indicating that the |
| // serializer should not step forwards in memory after a target is resolved |
| // and written. In this case the target_address_address function above |
| // should return the end of the instructions to be patched, allowing the |
| // deserializer to deserialize the instructions as raw bytes and put them in |
| // place, ready to be patched with the target. |
| INLINE(int target_address_size()); |
| |
| // Read/modify the reference in the instruction this relocation |
| // applies to; can only be called if rmode_ is external_reference |
| INLINE(Address target_reference()); |
| |
| // Read/modify the address of a call instruction. This is used to relocate |
| // the break points where straight-line code is patched with a call |
| // instruction. |
| INLINE(Address call_address()); |
| INLINE(void set_call_address(Address target)); |
| INLINE(Object* call_object()); |
| INLINE(void set_call_object(Object* target)); |
| INLINE(Object** call_object_address()); |
| |
| // Wipe out a relocation to a fixed value, used for making snapshots |
| // reproducible. |
| INLINE(void WipeOut()); |
| |
| template<typename StaticVisitor> inline void Visit(Heap* heap); |
| inline void Visit(Isolate* isolate, ObjectVisitor* v); |
| |
| // Patch the code with some other code. |
| void PatchCode(byte* instructions, int instruction_count); |
| |
| // Patch the code with a call. |
| void PatchCodeWithCall(Address target, int guard_bytes); |
| |
| // Check whether this return sequence has been patched |
| // with a call to the debugger. |
| INLINE(bool IsPatchedReturnSequence()); |
| |
| // Check whether this debug break slot has been patched with a call to the |
| // debugger. |
| INLINE(bool IsPatchedDebugBreakSlotSequence()); |
| |
| #ifdef DEBUG |
| // Check whether the given code contains relocation information that |
| // either is position-relative or movable by the garbage collector. |
| static bool RequiresRelocation(const CodeDesc& desc); |
| #endif |
| |
| #ifdef ENABLE_DISASSEMBLER |
| // Printing |
| static const char* RelocModeName(Mode rmode); |
| void Print(Isolate* isolate, OStream& os); // NOLINT |
| #endif // ENABLE_DISASSEMBLER |
| #ifdef VERIFY_HEAP |
| void Verify(Isolate* isolate); |
| #endif |
| |
| static const int kCodeTargetMask = (1 << (LAST_CODE_ENUM + 1)) - 1; |
| static const int kPositionMask = 1 << POSITION | 1 << STATEMENT_POSITION; |
| static const int kDataMask = |
| (1 << CODE_TARGET_WITH_ID) | kPositionMask | (1 << COMMENT); |
| static const int kApplyMask; // Modes affected by apply. Depends on arch. |
| |
| private: |
| // On ARM, note that pc_ is the address of the constant pool entry |
| // to be relocated and not the address of the instruction |
| // referencing the constant pool entry (except when rmode_ == |
| // comment). |
| byte* pc_; |
| Mode rmode_; |
| union { |
| intptr_t data_; |
| double data64_; |
| }; |
| Code* host_; |
| // External-reference pointers are also split across instruction-pairs |
| // on some platforms, but are accessed via indirect pointers. This location |
| // provides a place for that pointer to exist naturally. Its address |
| // is returned by RelocInfo::target_reference_address(). |
| Address reconstructed_adr_ptr_; |
| friend class RelocIterator; |
| }; |
| |
| |
| // RelocInfoWriter serializes a stream of relocation info. It writes towards |
| // lower addresses. |
| class RelocInfoWriter BASE_EMBEDDED { |
| public: |
| RelocInfoWriter() : pos_(NULL), |
| last_pc_(NULL), |
| last_id_(0), |
| last_position_(0) {} |
| RelocInfoWriter(byte* pos, byte* pc) : pos_(pos), |
| last_pc_(pc), |
| last_id_(0), |
| last_position_(0) {} |
| |
| byte* pos() const { return pos_; } |
| byte* last_pc() const { return last_pc_; } |
| |
| void Write(const RelocInfo* rinfo); |
| |
| // Update the state of the stream after reloc info buffer |
| // and/or code is moved while the stream is active. |
| void Reposition(byte* pos, byte* pc) { |
| pos_ = pos; |
| last_pc_ = pc; |
| } |
| |
| // Max size (bytes) of a written RelocInfo. Longest encoding is |
| // ExtraTag, VariableLengthPCJump, ExtraTag, pc_delta, ExtraTag, data_delta. |
| // On ia32 and arm this is 1 + 4 + 1 + 1 + 1 + 4 = 12. |
| // On x64 this is 1 + 4 + 1 + 1 + 1 + 8 == 16; |
| // Here we use the maximum of the two. |
| static const int kMaxSize = 16; |
| |
| private: |
| inline uint32_t WriteVariableLengthPCJump(uint32_t pc_delta); |
| inline void WriteTaggedPC(uint32_t pc_delta, int tag); |
| inline void WriteExtraTaggedPC(uint32_t pc_delta, int extra_tag); |
| inline void WriteExtraTaggedIntData(int data_delta, int top_tag); |
| inline void WriteExtraTaggedPoolData(int data, int pool_type); |
| inline void WriteExtraTaggedData(intptr_t data_delta, int top_tag); |
| inline void WriteTaggedData(intptr_t data_delta, int tag); |
| inline void WriteExtraTag(int extra_tag, int top_tag); |
| |
| byte* pos_; |
| byte* last_pc_; |
| int last_id_; |
| int last_position_; |
| DISALLOW_COPY_AND_ASSIGN(RelocInfoWriter); |
| }; |
| |
| |
| // A RelocIterator iterates over relocation information. |
| // Typical use: |
| // |
| // for (RelocIterator it(code); !it.done(); it.next()) { |
| // // do something with it.rinfo() here |
| // } |
| // |
| // A mask can be specified to skip unwanted modes. |
| class RelocIterator: public Malloced { |
| public: |
| // Create a new iterator positioned at |
| // the beginning of the reloc info. |
| // Relocation information with mode k is included in the |
| // iteration iff bit k of mode_mask is set. |
| explicit RelocIterator(Code* code, int mode_mask = -1); |
| explicit RelocIterator(const CodeDesc& desc, int mode_mask = -1); |
| |
| // Iteration |
| bool done() const { return done_; } |
| void next(); |
| |
| // Return pointer valid until next next(). |
| RelocInfo* rinfo() { |
| DCHECK(!done()); |
| return &rinfo_; |
| } |
| |
| private: |
| // Advance* moves the position before/after reading. |
| // *Read* reads from current byte(s) into rinfo_. |
| // *Get* just reads and returns info on current byte. |
| void Advance(int bytes = 1) { pos_ -= bytes; } |
| int AdvanceGetTag(); |
| int GetExtraTag(); |
| int GetTopTag(); |
| void ReadTaggedPC(); |
| void AdvanceReadPC(); |
| void AdvanceReadId(); |
| void AdvanceReadPoolData(); |
| void AdvanceReadPosition(); |
| void AdvanceReadData(); |
| void AdvanceReadVariableLengthPCJump(); |
| int GetLocatableTypeTag(); |
| void ReadTaggedId(); |
| void ReadTaggedPosition(); |
| |
| // If the given mode is wanted, set it in rinfo_ and return true. |
| // Else return false. Used for efficiently skipping unwanted modes. |
| bool SetMode(RelocInfo::Mode mode) { |
| return (mode_mask_ & (1 << mode)) ? (rinfo_.rmode_ = mode, true) : false; |
| } |
| |
| byte* pos_; |
| byte* end_; |
| byte* code_age_sequence_; |
| RelocInfo rinfo_; |
| bool done_; |
| int mode_mask_; |
| int last_id_; |
| int last_position_; |
| DISALLOW_COPY_AND_ASSIGN(RelocIterator); |
| }; |
| |
| |
| //------------------------------------------------------------------------------ |
| // External function |
| |
| //---------------------------------------------------------------------------- |
| class IC_Utility; |
| class SCTableReference; |
| class Debug_Address; |
| |
| |
| // An ExternalReference represents a C++ address used in the generated |
| // code. All references to C++ functions and variables must be encapsulated in |
| // an ExternalReference instance. This is done in order to track the origin of |
| // all external references in the code so that they can be bound to the correct |
| // addresses when deserializing a heap. |
| class ExternalReference BASE_EMBEDDED { |
| public: |
| // Used in the simulator to support different native api calls. |
| enum Type { |
| // Builtin call. |
| // Object* f(v8::internal::Arguments). |
| BUILTIN_CALL, // default |
| |
| // Builtin that takes float arguments and returns an int. |
| // int f(double, double). |
| BUILTIN_COMPARE_CALL, |
| |
| // Builtin call that returns floating point. |
| // double f(double, double). |
| BUILTIN_FP_FP_CALL, |
| |
| // Builtin call that returns floating point. |
| // double f(double). |
| BUILTIN_FP_CALL, |
| |
| // Builtin call that returns floating point. |
| // double f(double, int). |
| BUILTIN_FP_INT_CALL, |
| |
| // Direct call to API function callback. |
| // void f(v8::FunctionCallbackInfo&) |
| DIRECT_API_CALL, |
| |
| // Call to function callback via InvokeFunctionCallback. |
| // void f(v8::FunctionCallbackInfo&, v8::FunctionCallback) |
| PROFILING_API_CALL, |
| |
| // Direct call to accessor getter callback. |
| // void f(Local<Name> property, PropertyCallbackInfo& info) |
| DIRECT_GETTER_CALL, |
| |
| // Call to accessor getter callback via InvokeAccessorGetterCallback. |
| // void f(Local<Name> property, PropertyCallbackInfo& info, |
| // AccessorNameGetterCallback callback) |
| PROFILING_GETTER_CALL |
| }; |
| |
| static void SetUp(); |
| static void InitializeMathExpData(); |
| static void TearDownMathExpData(); |
| |
| typedef void* ExternalReferenceRedirector(void* original, Type type); |
| |
| ExternalReference() : address_(NULL) {} |
| |
| ExternalReference(Builtins::CFunctionId id, Isolate* isolate); |
| |
| ExternalReference(ApiFunction* ptr, Type type, Isolate* isolate); |
| |
| ExternalReference(Builtins::Name name, Isolate* isolate); |
| |
| ExternalReference(Runtime::FunctionId id, Isolate* isolate); |
| |
| ExternalReference(const Runtime::Function* f, Isolate* isolate); |
| |
| ExternalReference(const IC_Utility& ic_utility, Isolate* isolate); |
| |
| explicit ExternalReference(StatsCounter* counter); |
| |
| ExternalReference(Isolate::AddressId id, Isolate* isolate); |
| |
| explicit ExternalReference(const SCTableReference& table_ref); |
| |
| // Isolate as an external reference. |
| static ExternalReference isolate_address(Isolate* isolate); |
| |
| // One-of-a-kind references. These references are not part of a general |
| // pattern. This means that they have to be added to the |
| // ExternalReferenceTable in serialize.cc manually. |
| |
| static ExternalReference incremental_marking_record_write_function( |
| Isolate* isolate); |
| static ExternalReference store_buffer_overflow_function( |
| Isolate* isolate); |
| static ExternalReference flush_icache_function(Isolate* isolate); |
| static ExternalReference delete_handle_scope_extensions(Isolate* isolate); |
| |
| static ExternalReference get_date_field_function(Isolate* isolate); |
| static ExternalReference date_cache_stamp(Isolate* isolate); |
| |
| static ExternalReference get_make_code_young_function(Isolate* isolate); |
| static ExternalReference get_mark_code_as_executed_function(Isolate* isolate); |
| |
| // Deoptimization support. |
| static ExternalReference new_deoptimizer_function(Isolate* isolate); |
| static ExternalReference compute_output_frames_function(Isolate* isolate); |
| |
| // Log support. |
| static ExternalReference log_enter_external_function(Isolate* isolate); |
| static ExternalReference log_leave_external_function(Isolate* isolate); |
| |
| // Static data in the keyed lookup cache. |
| static ExternalReference keyed_lookup_cache_keys(Isolate* isolate); |
| static ExternalReference keyed_lookup_cache_field_offsets(Isolate* isolate); |
| |
| // Static variable Heap::roots_array_start() |
| static ExternalReference roots_array_start(Isolate* isolate); |
| |
| // Static variable Heap::allocation_sites_list_address() |
| static ExternalReference allocation_sites_list_address(Isolate* isolate); |
| |
| // Static variable StackGuard::address_of_jslimit() |
| static ExternalReference address_of_stack_limit(Isolate* isolate); |
| |
| // Static variable StackGuard::address_of_real_jslimit() |
| static ExternalReference address_of_real_stack_limit(Isolate* isolate); |
| |
| // Static variable RegExpStack::limit_address() |
| static ExternalReference address_of_regexp_stack_limit(Isolate* isolate); |
| |
| // Static variables for RegExp. |
| static ExternalReference address_of_static_offsets_vector(Isolate* isolate); |
| static ExternalReference address_of_regexp_stack_memory_address( |
| Isolate* isolate); |
| static ExternalReference address_of_regexp_stack_memory_size( |
| Isolate* isolate); |
| |
| // Static variable Heap::NewSpaceStart() |
| static ExternalReference new_space_start(Isolate* isolate); |
| static ExternalReference new_space_mask(Isolate* isolate); |
| |
| // Write barrier. |
| static ExternalReference store_buffer_top(Isolate* isolate); |
| |
| // Used for fast allocation in generated code. |
| static ExternalReference new_space_allocation_top_address(Isolate* isolate); |
| static ExternalReference new_space_allocation_limit_address(Isolate* isolate); |
| static ExternalReference old_pointer_space_allocation_top_address( |
| Isolate* isolate); |
| static ExternalReference old_pointer_space_allocation_limit_address( |
| Isolate* isolate); |
| static ExternalReference old_data_space_allocation_top_address( |
| Isolate* isolate); |
| static ExternalReference old_data_space_allocation_limit_address( |
| Isolate* isolate); |
| |
| static ExternalReference mod_two_doubles_operation(Isolate* isolate); |
| static ExternalReference power_double_double_function(Isolate* isolate); |
| static ExternalReference power_double_int_function(Isolate* isolate); |
| |
| static ExternalReference handle_scope_next_address(Isolate* isolate); |
| static ExternalReference handle_scope_limit_address(Isolate* isolate); |
| static ExternalReference handle_scope_level_address(Isolate* isolate); |
| |
| static ExternalReference scheduled_exception_address(Isolate* isolate); |
| static ExternalReference address_of_pending_message_obj(Isolate* isolate); |
| static ExternalReference address_of_has_pending_message(Isolate* isolate); |
| static ExternalReference address_of_pending_message_script(Isolate* isolate); |
| |
| // Static variables containing common double constants. |
| static ExternalReference address_of_min_int(); |
| static ExternalReference address_of_one_half(); |
| static ExternalReference address_of_minus_one_half(); |
| static ExternalReference address_of_negative_infinity(); |
| static ExternalReference address_of_canonical_non_hole_nan(); |
| static ExternalReference address_of_the_hole_nan(); |
| static ExternalReference address_of_uint32_bias(); |
| |
| static ExternalReference math_log_double_function(Isolate* isolate); |
| |
| static ExternalReference math_exp_constants(int constant_index); |
| static ExternalReference math_exp_log_table(); |
| |
| static ExternalReference page_flags(Page* page); |
| |
| static ExternalReference ForDeoptEntry(Address entry); |
| |
| static ExternalReference cpu_features(); |
| |
| static ExternalReference debug_is_active_address(Isolate* isolate); |
| static ExternalReference debug_after_break_target_address(Isolate* isolate); |
| static ExternalReference debug_restarter_frame_function_pointer_address( |
| Isolate* isolate); |
| |
| static ExternalReference is_profiling_address(Isolate* isolate); |
| static ExternalReference invoke_function_callback(Isolate* isolate); |
| static ExternalReference invoke_accessor_getter_callback(Isolate* isolate); |
| |
| Address address() const { return reinterpret_cast<Address>(address_); } |
| |
| // Function Debug::Break() |
| static ExternalReference debug_break(Isolate* isolate); |
| |
| // Used to check if single stepping is enabled in generated code. |
| static ExternalReference debug_step_in_fp_address(Isolate* isolate); |
| |
| #ifndef V8_INTERPRETED_REGEXP |
| // C functions called from RegExp generated code. |
| |
| // Function NativeRegExpMacroAssembler::CaseInsensitiveCompareUC16() |
| static ExternalReference re_case_insensitive_compare_uc16(Isolate* isolate); |
| |
| // Function RegExpMacroAssembler*::CheckStackGuardState() |
| static ExternalReference re_check_stack_guard_state(Isolate* isolate); |
| |
| // Function NativeRegExpMacroAssembler::GrowStack() |
| static ExternalReference re_grow_stack(Isolate* isolate); |
| |
| // byte NativeRegExpMacroAssembler::word_character_bitmap |
| static ExternalReference re_word_character_map(); |
| |
| #endif |
| |
| // This lets you register a function that rewrites all external references. |
| // Used by the ARM simulator to catch calls to external references. |
| static void set_redirector(Isolate* isolate, |
| ExternalReferenceRedirector* redirector) { |
| // We can't stack them. |
| DCHECK(isolate->external_reference_redirector() == NULL); |
| isolate->set_external_reference_redirector( |
| reinterpret_cast<ExternalReferenceRedirectorPointer*>(redirector)); |
| } |
| |
| static ExternalReference stress_deopt_count(Isolate* isolate); |
| |
| bool operator==(const ExternalReference& other) const { |
| return address_ == other.address_; |
| } |
| |
| bool operator!=(const ExternalReference& other) const { |
| return !(*this == other); |
| } |
| |
| private: |
| explicit ExternalReference(void* address) |
| : address_(address) {} |
| |
| static void* Redirect(Isolate* isolate, |
| Address address_arg, |
| Type type = ExternalReference::BUILTIN_CALL) { |
| ExternalReferenceRedirector* redirector = |
| reinterpret_cast<ExternalReferenceRedirector*>( |
| isolate->external_reference_redirector()); |
| void* address = reinterpret_cast<void*>(address_arg); |
| void* answer = (redirector == NULL) ? |
| address : |
| (*redirector)(address, type); |
| return answer; |
| } |
| |
| void* address_; |
| }; |
| |
| |
| // ----------------------------------------------------------------------------- |
| // Position recording support |
| |
| struct PositionState { |
| PositionState() : current_position(RelocInfo::kNoPosition), |
| written_position(RelocInfo::kNoPosition), |
| current_statement_position(RelocInfo::kNoPosition), |
| written_statement_position(RelocInfo::kNoPosition) {} |
| |
| int current_position; |
| int written_position; |
| |
| int current_statement_position; |
| int written_statement_position; |
| }; |
| |
| |
| class PositionsRecorder BASE_EMBEDDED { |
| public: |
| explicit PositionsRecorder(Assembler* assembler) |
| : assembler_(assembler) { |
| jit_handler_data_ = NULL; |
| } |
| |
| void AttachJITHandlerData(void* user_data) { |
| jit_handler_data_ = user_data; |
| } |
| |
| void* DetachJITHandlerData() { |
| void* old_data = jit_handler_data_; |
| jit_handler_data_ = NULL; |
| return old_data; |
| } |
| // Set current position to pos. |
| void RecordPosition(int pos); |
| |
| // Set current statement position to pos. |
| void RecordStatementPosition(int pos); |
| |
| // Write recorded positions to relocation information. |
| bool WriteRecordedPositions(); |
| |
| int current_position() const { return state_.current_position; } |
| |
| int current_statement_position() const { |
| return state_.current_statement_position; |
| } |
| |
| private: |
| Assembler* assembler_; |
| PositionState state_; |
| |
| // Currently jit_handler_data_ is used to store JITHandler-specific data |
| // over the lifetime of a PositionsRecorder |
| void* jit_handler_data_; |
| friend class PreservePositionScope; |
| |
| DISALLOW_COPY_AND_ASSIGN(PositionsRecorder); |
| }; |
| |
| |
| class PreservePositionScope BASE_EMBEDDED { |
| public: |
| explicit PreservePositionScope(PositionsRecorder* positions_recorder) |
| : positions_recorder_(positions_recorder), |
| saved_state_(positions_recorder->state_) {} |
| |
| ~PreservePositionScope() { |
| positions_recorder_->state_ = saved_state_; |
| } |
| |
| private: |
| PositionsRecorder* positions_recorder_; |
| const PositionState saved_state_; |
| |
| DISALLOW_COPY_AND_ASSIGN(PreservePositionScope); |
| }; |
| |
| |
| // ----------------------------------------------------------------------------- |
| // Utility functions |
| |
| inline int NumberOfBitsSet(uint32_t x) { |
| unsigned int num_bits_set; |
| for (num_bits_set = 0; x; x >>= 1) { |
| num_bits_set += x & 1; |
| } |
| return num_bits_set; |
| } |
| |
| bool EvalComparison(Token::Value op, double op1, double op2); |
| |
| // Computes pow(x, y) with the special cases in the spec for Math.pow. |
| double power_helper(double x, double y); |
| double power_double_int(double x, int y); |
| double power_double_double(double x, double y); |
| |
| // Helper class for generating code or data associated with the code |
| // right after a call instruction. As an example this can be used to |
| // generate safepoint data after calls for crankshaft. |
| class CallWrapper { |
| public: |
| CallWrapper() { } |
| virtual ~CallWrapper() { } |
| // Called just before emitting a call. Argument is the size of the generated |
| // call code. |
| virtual void BeforeCall(int call_size) const = 0; |
| // Called just after emitting a call, i.e., at the return site for the call. |
| virtual void AfterCall() const = 0; |
| }; |
| |
| class NullCallWrapper : public CallWrapper { |
| public: |
| NullCallWrapper() { } |
| virtual ~NullCallWrapper() { } |
| virtual void BeforeCall(int call_size) const { } |
| virtual void AfterCall() const { } |
| }; |
| |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_ASSEMBLER_H_ |