// Copyright 2006-2009 the V8 project authors. 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. // * Redistributions 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 Google Inc. nor the names of its // 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. #ifndef V8_IA32_MACRO_ASSEMBLER_IA32_H_ #define V8_IA32_MACRO_ASSEMBLER_IA32_H_ #include "assembler.h" namespace v8 { namespace internal { // Flags used for the AllocateInNewSpace functions. enum AllocationFlags { // No special flags. NO_ALLOCATION_FLAGS = 0, // Return the pointer to the allocated already tagged as a heap object. TAG_OBJECT = 1 << 0, // The content of the result register already contains the allocation top in // new space. RESULT_CONTAINS_TOP = 1 << 1 }; // Convenience for platform-independent signatures. We do not normally // distinguish memory operands from other operands on ia32. typedef Operand MemOperand; // Forward declaration. class JumpTarget; // MacroAssembler implements a collection of frequently used macros. class MacroAssembler: public Assembler { public: MacroAssembler(void* buffer, int size); // --------------------------------------------------------------------------- // GC Support // For page containing |object| mark region covering |addr| dirty. // RecordWriteHelper only works if the object is not in new // space. void RecordWriteHelper(Register object, Register addr, Register scratch); // Check if object is in new space. // scratch can be object itself, but it will be clobbered. void InNewSpace(Register object, Register scratch, Condition cc, // equal for new space, not_equal otherwise. Label* branch); // For page containing |object| mark region covering [object+offset] dirty. // object is the object being stored into, value is the object being stored. // If offset is zero, then the scratch register contains the array index into // the elements array represented as a Smi. // All registers are clobbered by the operation. void RecordWrite(Register object, int offset, Register value, Register scratch); #ifdef ENABLE_DEBUGGER_SUPPORT // --------------------------------------------------------------------------- // Debugger Support void SaveRegistersToMemory(RegList regs); void RestoreRegistersFromMemory(RegList regs); void PushRegistersFromMemory(RegList regs); void PopRegistersToMemory(RegList regs); void CopyRegistersFromStackToMemory(Register base, Register scratch, RegList regs); void DebugBreak(); #endif // --------------------------------------------------------------------------- // Stack limit support // Do simple test for stack overflow. This doesn't handle an overflow. void StackLimitCheck(Label* on_stack_limit_hit); // --------------------------------------------------------------------------- // Activation frames void EnterInternalFrame() { EnterFrame(StackFrame::INTERNAL); } void LeaveInternalFrame() { LeaveFrame(StackFrame::INTERNAL); } void EnterConstructFrame() { EnterFrame(StackFrame::CONSTRUCT); } void LeaveConstructFrame() { LeaveFrame(StackFrame::CONSTRUCT); } // Enter specific kind of exit frame; either in normal or debug mode. // Expects the number of arguments in register eax and // sets up the number of arguments in register edi and the pointer // to the first argument in register esi. void EnterExitFrame(ExitFrame::Mode mode); void EnterApiExitFrame(ExitFrame::Mode mode, int stack_space, int argc); // Leave the current exit frame. Expects the return value in // register eax:edx (untouched) and the pointer to the first // argument in register esi. void LeaveExitFrame(ExitFrame::Mode mode); // Find the function context up the context chain. void LoadContext(Register dst, int context_chain_length); // --------------------------------------------------------------------------- // JavaScript invokes // Invoke the JavaScript function code by either calling or jumping. void InvokeCode(const Operand& code, const ParameterCount& expected, const ParameterCount& actual, InvokeFlag flag); void InvokeCode(Handle code, const ParameterCount& expected, const ParameterCount& actual, RelocInfo::Mode rmode, InvokeFlag flag); // Invoke the JavaScript function in the given register. Changes the // current context to the context in the function before invoking. void InvokeFunction(Register function, const ParameterCount& actual, InvokeFlag flag); void InvokeFunction(JSFunction* function, const ParameterCount& actual, InvokeFlag flag); // Invoke specified builtin JavaScript function. Adds an entry to // the unresolved list if the name does not resolve. void InvokeBuiltin(Builtins::JavaScript id, InvokeFlag flag); // Store the code object for the given builtin in the target register. void GetBuiltinEntry(Register target, Builtins::JavaScript id); // Expression support void Set(Register dst, const Immediate& x); void Set(const Operand& dst, const Immediate& x); // Compare object type for heap object. // Incoming register is heap_object and outgoing register is map. void CmpObjectType(Register heap_object, InstanceType type, Register map); // Compare instance type for map. void CmpInstanceType(Register map, InstanceType type); // Check if the map of an object is equal to a specified map and // branch to label if not. Skip the smi check if not required // (object is known to be a heap object) void CheckMap(Register obj, Handle map, Label* fail, bool is_heap_object); // Check if the object in register heap_object is a string. Afterwards the // register map contains the object map and the register instance_type // contains the instance_type. The registers map and instance_type can be the // same in which case it contains the instance type afterwards. Either of the // registers map and instance_type can be the same as heap_object. Condition IsObjectStringType(Register heap_object, Register map, Register instance_type); // Check if a heap object's type is in the JSObject range, not including // JSFunction. The object's map will be loaded in the map register. // Any or all of the three registers may be the same. // The contents of the scratch register will always be overwritten. void IsObjectJSObjectType(Register heap_object, Register map, Register scratch, Label* fail); // The contents of the scratch register will be overwritten. void IsInstanceJSObjectType(Register map, Register scratch, Label* fail); // FCmp is similar to integer cmp, but requires unsigned // jcc instructions (je, ja, jae, jb, jbe, je, and jz). void FCmp(); // Smi tagging support. void SmiTag(Register reg) { ASSERT(kSmiTag == 0); ASSERT(kSmiTagSize == 1); add(reg, Operand(reg)); } void SmiUntag(Register reg) { sar(reg, kSmiTagSize); } // Abort execution if argument is not a number. Used in debug code. void AbortIfNotNumber(Register object); // Abort execution if argument is not a smi. Used in debug code. void AbortIfNotSmi(Register object); // --------------------------------------------------------------------------- // Exception handling // Push a new try handler and link into try handler chain. The return // address must be pushed before calling this helper. void PushTryHandler(CodeLocation try_location, HandlerType type); // Unlink the stack handler on top of the stack from the try handler chain. void PopTryHandler(); // --------------------------------------------------------------------------- // Inline caching support // Generates code that verifies that the maps of objects in the // prototype chain of object hasn't changed since the code was // generated and branches to the miss label if any map has. If // necessary the function also generates code for security check // in case of global object holders. The scratch and holder // registers are always clobbered, but the object register is only // clobbered if it the same as the holder register. The function // returns a register containing the holder - either object_reg or // holder_reg. // The function can optionally (when save_at_depth != // kInvalidProtoDepth) save the object at the given depth by moving // it to [esp + kPointerSize]. Register CheckMaps(JSObject* object, Register object_reg, JSObject* holder, Register holder_reg, Register scratch, int save_at_depth, Label* miss); // Generate code for checking access rights - used for security checks // on access to global objects across environments. The holder register // is left untouched, but the scratch register is clobbered. void CheckAccessGlobalProxy(Register holder_reg, Register scratch, Label* miss); // --------------------------------------------------------------------------- // Allocation support // Allocate an object in new space. If the new space is exhausted control // continues at the gc_required label. The allocated object is returned in // result and end of the new object is returned in result_end. The register // scratch can be passed as no_reg in which case an additional object // reference will be added to the reloc info. The returned pointers in result // and result_end have not yet been tagged as heap objects. If // result_contains_top_on_entry is true the content of result is known to be // the allocation top on entry (could be result_end from a previous call to // AllocateInNewSpace). If result_contains_top_on_entry is true scratch // should be no_reg as it is never used. void AllocateInNewSpace(int object_size, Register result, Register result_end, Register scratch, Label* gc_required, AllocationFlags flags); void AllocateInNewSpace(int header_size, ScaleFactor element_size, Register element_count, Register result, Register result_end, Register scratch, Label* gc_required, AllocationFlags flags); void AllocateInNewSpace(Register object_size, Register result, Register result_end, Register scratch, Label* gc_required, AllocationFlags flags); // Undo allocation in new space. The object passed and objects allocated after // it will no longer be allocated. Make sure that no pointers are left to the // object(s) no longer allocated as they would be invalid when allocation is // un-done. void UndoAllocationInNewSpace(Register object); // Allocate a heap number in new space with undefined value. The // register scratch2 can be passed as no_reg; the others must be // valid registers. Returns tagged pointer in result register, or // jumps to gc_required if new space is full. void AllocateHeapNumber(Register result, Register scratch1, Register scratch2, Label* gc_required); // Allocate a sequential string. All the header fields of the string object // are initialized. void AllocateTwoByteString(Register result, Register length, Register scratch1, Register scratch2, Register scratch3, Label* gc_required); void AllocateAsciiString(Register result, Register length, Register scratch1, Register scratch2, Register scratch3, Label* gc_required); // Allocate a raw cons string object. Only the map field of the result is // initialized. void AllocateConsString(Register result, Register scratch1, Register scratch2, Label* gc_required); void AllocateAsciiConsString(Register result, Register scratch1, Register scratch2, Label* gc_required); // --------------------------------------------------------------------------- // Support functions. // Check if result is zero and op is negative. void NegativeZeroTest(Register result, Register op, Label* then_label); // Check if result is zero and op is negative in code using jump targets. void NegativeZeroTest(CodeGenerator* cgen, Register result, Register op, JumpTarget* then_target); // Check if result is zero and any of op1 and op2 are negative. // Register scratch is destroyed, and it must be different from op2. void NegativeZeroTest(Register result, Register op1, Register op2, Register scratch, Label* then_label); // Try to get function prototype of a function and puts the value in // the result register. Checks that the function really is a // function and jumps to the miss label if the fast checks fail. The // function register will be untouched; the other registers may be // clobbered. void TryGetFunctionPrototype(Register function, Register result, Register scratch, Label* miss); // Generates code for reporting that an illegal operation has // occurred. void IllegalOperation(int num_arguments); // --------------------------------------------------------------------------- // Runtime calls // Call a code stub. Generate the code if necessary. void CallStub(CodeStub* stub); // Call a code stub and return the code object called. Try to generate // the code if necessary. Do not perform a GC but instead return a retry // after GC failure. Object* TryCallStub(CodeStub* stub); // Tail call a code stub (jump). Generate the code if necessary. void TailCallStub(CodeStub* stub); // Tail call a code stub (jump) and return the code object called. Try to // generate the code if necessary. Do not perform a GC but instead return // a retry after GC failure. Object* TryTailCallStub(CodeStub* stub); // Return from a code stub after popping its arguments. void StubReturn(int argc); // Call a runtime routine. void CallRuntime(Runtime::Function* f, int num_arguments); // Call a runtime function, returning the CodeStub object called. // Try to generate the stub code if necessary. Do not perform a GC // but instead return a retry after GC failure. Object* TryCallRuntime(Runtime::Function* f, int num_arguments); // Convenience function: Same as above, but takes the fid instead. void CallRuntime(Runtime::FunctionId id, int num_arguments); // Convenience function: call an external reference. void CallExternalReference(ExternalReference ref, int num_arguments); // Convenience function: Same as above, but takes the fid instead. Object* TryCallRuntime(Runtime::FunctionId id, int num_arguments); // Tail call of a runtime routine (jump). // Like JumpToExternalReference, but also takes care of passing the number // of parameters. void TailCallExternalReference(const ExternalReference& ext, int num_arguments, int result_size); // Convenience function: tail call a runtime routine (jump). void TailCallRuntime(Runtime::FunctionId fid, int num_arguments, int result_size); // Before calling a C-function from generated code, align arguments on stack. // After aligning the frame, arguments must be stored in esp[0], esp[4], // etc., not pushed. The argument count assumes all arguments are word sized. // Some compilers/platforms require the stack to be aligned when calling // C++ code. // Needs a scratch register to do some arithmetic. This register will be // trashed. void PrepareCallCFunction(int num_arguments, Register scratch); // Calls a C function and cleans up the space for arguments allocated // by PrepareCallCFunction. The called function is not allowed to trigger a // garbage collection, since that might move the code and invalidate the // return address (unless this is somehow accounted for by the called // function). void CallCFunction(ExternalReference function, int num_arguments); void CallCFunction(Register function, int num_arguments); void PushHandleScope(Register scratch); // Pops a handle scope using the specified scratch register and // ensuring that saved register, it is not no_reg, is left unchanged. void PopHandleScope(Register saved, Register scratch); // As PopHandleScope, but does not perform a GC. Instead, returns a // retry after GC failure object if GC is necessary. Object* TryPopHandleScope(Register saved, Register scratch); // Jump to a runtime routine. void JumpToExternalReference(const ExternalReference& ext); // --------------------------------------------------------------------------- // Utilities void Ret(); // Emit code to discard a non-negative number of pointer-sized elements // from the stack, clobbering only the esp register. void Drop(int element_count); void Call(Label* target) { call(target); } void Move(Register target, Handle value); Handle CodeObject() { return code_object_; } // --------------------------------------------------------------------------- // StatsCounter support void SetCounter(StatsCounter* counter, int value); void IncrementCounter(StatsCounter* counter, int value); void DecrementCounter(StatsCounter* counter, int value); void IncrementCounter(Condition cc, StatsCounter* counter, int value); void DecrementCounter(Condition cc, StatsCounter* counter, int value); // --------------------------------------------------------------------------- // Debugging // Calls Abort(msg) if the condition cc is not satisfied. // Use --debug_code to enable. void Assert(Condition cc, const char* msg); // Like Assert(), but always enabled. void Check(Condition cc, const char* msg); // Print a message to stdout and abort execution. void Abort(const char* msg); // Check that the stack is aligned. void CheckStackAlignment(); // Verify restrictions about code generated in stubs. void set_generating_stub(bool value) { generating_stub_ = value; } bool generating_stub() { return generating_stub_; } void set_allow_stub_calls(bool value) { allow_stub_calls_ = value; } bool allow_stub_calls() { return allow_stub_calls_; } // --------------------------------------------------------------------------- // String utilities. // Check whether the instance type represents a flat ascii string. Jump to the // label if not. If the instance type can be scratched specify same register // for both instance type and scratch. void JumpIfInstanceTypeIsNotSequentialAscii(Register instance_type, Register scratch, Label* on_not_flat_ascii_string); // Checks if both objects are sequential ASCII strings, and jumps to label // if either is not. void JumpIfNotBothSequentialAsciiStrings(Register object1, Register object2, Register scratch1, Register scratch2, Label* on_not_flat_ascii_strings); private: bool generating_stub_; bool allow_stub_calls_; // This handle will be patched with the code object on installation. Handle code_object_; // Helper functions for generating invokes. void InvokePrologue(const ParameterCount& expected, const ParameterCount& actual, Handle code_constant, const Operand& code_operand, Label* done, InvokeFlag flag); // Activation support. void EnterFrame(StackFrame::Type type); void LeaveFrame(StackFrame::Type type); void EnterExitFramePrologue(ExitFrame::Mode mode); void EnterExitFrameEpilogue(ExitFrame::Mode mode, int argc); // Allocation support helpers. void LoadAllocationTopHelper(Register result, Register result_end, Register scratch, AllocationFlags flags); void UpdateAllocationTopHelper(Register result_end, Register scratch); // Helper for PopHandleScope. Allowed to perform a GC and returns // NULL if gc_allowed. Does not perform a GC if !gc_allowed, and // possibly returns a failure object indicating an allocation failure. Object* PopHandleScopeHelper(Register saved, Register scratch, bool gc_allowed); }; // The code patcher is used to patch (typically) small parts of code e.g. for // debugging and other types of instrumentation. When using the code patcher // the exact number of bytes specified must be emitted. Is not legal to emit // relocation information. If any of these constraints are violated it causes // an assertion. class CodePatcher { public: CodePatcher(byte* address, int size); virtual ~CodePatcher(); // Macro assembler to emit code. MacroAssembler* masm() { return &masm_; } private: byte* address_; // The address of the code being patched. int size_; // Number of bytes of the expected patch size. MacroAssembler masm_; // Macro assembler used to generate the code. }; // ----------------------------------------------------------------------------- // Static helper functions. // Generate an Operand for loading a field from an object. static inline Operand FieldOperand(Register object, int offset) { return Operand(object, offset - kHeapObjectTag); } // Generate an Operand for loading an indexed field from an object. static inline Operand FieldOperand(Register object, Register index, ScaleFactor scale, int offset) { return Operand(object, index, scale, offset - kHeapObjectTag); } #ifdef GENERATED_CODE_COVERAGE extern void LogGeneratedCodeCoverage(const char* file_line); #define CODE_COVERAGE_STRINGIFY(x) #x #define CODE_COVERAGE_TOSTRING(x) CODE_COVERAGE_STRINGIFY(x) #define __FILE_LINE__ __FILE__ ":" CODE_COVERAGE_TOSTRING(__LINE__) #define ACCESS_MASM(masm) { \ byte* ia32_coverage_function = \ reinterpret_cast(FUNCTION_ADDR(LogGeneratedCodeCoverage)); \ masm->pushfd(); \ masm->pushad(); \ masm->push(Immediate(reinterpret_cast(&__FILE_LINE__))); \ masm->call(ia32_coverage_function, RelocInfo::RUNTIME_ENTRY); \ masm->pop(eax); \ masm->popad(); \ masm->popfd(); \ } \ masm-> #else #define ACCESS_MASM(masm) masm-> #endif } } // namespace v8::internal #endif // V8_IA32_MACRO_ASSEMBLER_IA32_H_