// Copyright 2012 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. #include "v8.h" #if defined(V8_TARGET_ARCH_ARM) #include "codegen.h" #include "debug.h" #include "deoptimizer.h" #include "full-codegen.h" #include "runtime.h" namespace v8 { namespace internal { #define __ ACCESS_MASM(masm) void Builtins::Generate_Adaptor(MacroAssembler* masm, CFunctionId id, BuiltinExtraArguments extra_args) { // ----------- S t a t e ------------- // -- r0 : number of arguments excluding receiver // -- r1 : called function (only guaranteed when // extra_args requires it) // -- cp : context // -- sp[0] : last argument // -- ... // -- sp[4 * (argc - 1)] : first argument (argc == r0) // -- sp[4 * argc] : receiver // ----------------------------------- // Insert extra arguments. int num_extra_args = 0; if (extra_args == NEEDS_CALLED_FUNCTION) { num_extra_args = 1; __ push(r1); } else { ASSERT(extra_args == NO_EXTRA_ARGUMENTS); } // JumpToExternalReference expects r0 to contain the number of arguments // including the receiver and the extra arguments. __ add(r0, r0, Operand(num_extra_args + 1)); __ JumpToExternalReference(ExternalReference(id, masm->isolate())); } // Load the built-in InternalArray function from the current context. static void GenerateLoadInternalArrayFunction(MacroAssembler* masm, Register result) { // Load the native context. __ ldr(result, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX))); __ ldr(result, FieldMemOperand(result, GlobalObject::kNativeContextOffset)); // Load the InternalArray function from the native context. __ ldr(result, MemOperand(result, Context::SlotOffset( Context::INTERNAL_ARRAY_FUNCTION_INDEX))); } // Load the built-in Array function from the current context. static void GenerateLoadArrayFunction(MacroAssembler* masm, Register result) { // Load the native context. __ ldr(result, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX))); __ ldr(result, FieldMemOperand(result, GlobalObject::kNativeContextOffset)); // Load the Array function from the native context. __ ldr(result, MemOperand(result, Context::SlotOffset(Context::ARRAY_FUNCTION_INDEX))); } // Allocate an empty JSArray. The allocated array is put into the result // register. An elements backing store is allocated with size initial_capacity // and filled with the hole values. static void AllocateEmptyJSArray(MacroAssembler* masm, Register array_function, Register result, Register scratch1, Register scratch2, Register scratch3, Label* gc_required) { const int initial_capacity = JSArray::kPreallocatedArrayElements; STATIC_ASSERT(initial_capacity >= 0); __ LoadInitialArrayMap(array_function, scratch2, scratch1, false); // Allocate the JSArray object together with space for a fixed array with the // requested elements. int size = JSArray::kSize; if (initial_capacity > 0) { size += FixedArray::SizeFor(initial_capacity); } __ AllocateInNewSpace(size, result, scratch2, scratch3, gc_required, TAG_OBJECT); // Allocated the JSArray. Now initialize the fields except for the elements // array. // result: JSObject // scratch1: initial map // scratch2: start of next object __ str(scratch1, FieldMemOperand(result, JSObject::kMapOffset)); __ LoadRoot(scratch1, Heap::kEmptyFixedArrayRootIndex); __ str(scratch1, FieldMemOperand(result, JSArray::kPropertiesOffset)); // Field JSArray::kElementsOffset is initialized later. __ mov(scratch3, Operand(0, RelocInfo::NONE)); __ str(scratch3, FieldMemOperand(result, JSArray::kLengthOffset)); if (initial_capacity == 0) { __ str(scratch1, FieldMemOperand(result, JSArray::kElementsOffset)); return; } // Calculate the location of the elements array and set elements array member // of the JSArray. // result: JSObject // scratch2: start of next object __ add(scratch1, result, Operand(JSArray::kSize)); __ str(scratch1, FieldMemOperand(result, JSArray::kElementsOffset)); // Clear the heap tag on the elements array. __ sub(scratch1, scratch1, Operand(kHeapObjectTag)); // Initialize the FixedArray and fill it with holes. FixedArray length is // stored as a smi. // result: JSObject // scratch1: elements array (untagged) // scratch2: start of next object __ LoadRoot(scratch3, Heap::kFixedArrayMapRootIndex); STATIC_ASSERT(0 * kPointerSize == FixedArray::kMapOffset); __ str(scratch3, MemOperand(scratch1, kPointerSize, PostIndex)); __ mov(scratch3, Operand(Smi::FromInt(initial_capacity))); STATIC_ASSERT(1 * kPointerSize == FixedArray::kLengthOffset); __ str(scratch3, MemOperand(scratch1, kPointerSize, PostIndex)); // Fill the FixedArray with the hole value. Inline the code if short. STATIC_ASSERT(2 * kPointerSize == FixedArray::kHeaderSize); __ LoadRoot(scratch3, Heap::kTheHoleValueRootIndex); static const int kLoopUnfoldLimit = 4; if (initial_capacity <= kLoopUnfoldLimit) { for (int i = 0; i < initial_capacity; i++) { __ str(scratch3, MemOperand(scratch1, kPointerSize, PostIndex)); } } else { Label loop, entry; __ add(scratch2, scratch1, Operand(initial_capacity * kPointerSize)); __ b(&entry); __ bind(&loop); __ str(scratch3, MemOperand(scratch1, kPointerSize, PostIndex)); __ bind(&entry); __ cmp(scratch1, scratch2); __ b(lt, &loop); } } // Allocate a JSArray with the number of elements stored in a register. The // register array_function holds the built-in Array function and the register // array_size holds the size of the array as a smi. The allocated array is put // into the result register and beginning and end of the FixedArray elements // storage is put into registers elements_array_storage and elements_array_end // (see below for when that is not the case). If the parameter fill_with_holes // is true the allocated elements backing store is filled with the hole values // otherwise it is left uninitialized. When the backing store is filled the // register elements_array_storage is scratched. static void AllocateJSArray(MacroAssembler* masm, Register array_function, // Array function. Register array_size, // As a smi, cannot be 0. Register result, Register elements_array_storage, Register elements_array_end, Register scratch1, Register scratch2, bool fill_with_hole, Label* gc_required) { // Load the initial map from the array function. __ LoadInitialArrayMap(array_function, scratch2, elements_array_storage, fill_with_hole); if (FLAG_debug_code) { // Assert that array size is not zero. __ tst(array_size, array_size); __ Assert(ne, "array size is unexpectedly 0"); } // Allocate the JSArray object together with space for a FixedArray with the // requested number of elements. STATIC_ASSERT(kSmiTagSize == 1 && kSmiTag == 0); __ mov(elements_array_end, Operand((JSArray::kSize + FixedArray::kHeaderSize) / kPointerSize)); __ add(elements_array_end, elements_array_end, Operand(array_size, ASR, kSmiTagSize)); __ AllocateInNewSpace( elements_array_end, result, scratch1, scratch2, gc_required, static_cast(TAG_OBJECT | SIZE_IN_WORDS)); // Allocated the JSArray. Now initialize the fields except for the elements // array. // result: JSObject // elements_array_storage: initial map // array_size: size of array (smi) __ str(elements_array_storage, FieldMemOperand(result, JSObject::kMapOffset)); __ LoadRoot(elements_array_storage, Heap::kEmptyFixedArrayRootIndex); __ str(elements_array_storage, FieldMemOperand(result, JSArray::kPropertiesOffset)); // Field JSArray::kElementsOffset is initialized later. __ str(array_size, FieldMemOperand(result, JSArray::kLengthOffset)); // Calculate the location of the elements array and set elements array member // of the JSArray. // result: JSObject // array_size: size of array (smi) __ add(elements_array_storage, result, Operand(JSArray::kSize)); __ str(elements_array_storage, FieldMemOperand(result, JSArray::kElementsOffset)); // Clear the heap tag on the elements array. STATIC_ASSERT(kSmiTag == 0); __ sub(elements_array_storage, elements_array_storage, Operand(kHeapObjectTag)); // Initialize the fixed array and fill it with holes. FixedArray length is // stored as a smi. // result: JSObject // elements_array_storage: elements array (untagged) // array_size: size of array (smi) __ LoadRoot(scratch1, Heap::kFixedArrayMapRootIndex); ASSERT_EQ(0 * kPointerSize, FixedArray::kMapOffset); __ str(scratch1, MemOperand(elements_array_storage, kPointerSize, PostIndex)); STATIC_ASSERT(kSmiTag == 0); ASSERT_EQ(1 * kPointerSize, FixedArray::kLengthOffset); __ str(array_size, MemOperand(elements_array_storage, kPointerSize, PostIndex)); // Calculate elements array and elements array end. // result: JSObject // elements_array_storage: elements array element storage // array_size: smi-tagged size of elements array STATIC_ASSERT(kSmiTag == 0 && kSmiTagSize < kPointerSizeLog2); __ add(elements_array_end, elements_array_storage, Operand(array_size, LSL, kPointerSizeLog2 - kSmiTagSize)); // Fill the allocated FixedArray with the hole value if requested. // result: JSObject // elements_array_storage: elements array element storage // elements_array_end: start of next object if (fill_with_hole) { Label loop, entry; __ LoadRoot(scratch1, Heap::kTheHoleValueRootIndex); __ jmp(&entry); __ bind(&loop); __ str(scratch1, MemOperand(elements_array_storage, kPointerSize, PostIndex)); __ bind(&entry); __ cmp(elements_array_storage, elements_array_end); __ b(lt, &loop); } } // Create a new array for the built-in Array function. This function allocates // the JSArray object and the FixedArray elements array and initializes these. // If the Array cannot be constructed in native code the runtime is called. This // function assumes the following state: // r0: argc // r1: constructor (built-in Array function) // lr: return address // sp[0]: last argument // This function is used for both construct and normal calls of Array. The only // difference between handling a construct call and a normal call is that for a // construct call the constructor function in r1 needs to be preserved for // entering the generic code. In both cases argc in r0 needs to be preserved. // Both registers are preserved by this code so no need to differentiate between // construct call and normal call. static void ArrayNativeCode(MacroAssembler* masm, Label* call_generic_code) { Counters* counters = masm->isolate()->counters(); Label argc_one_or_more, argc_two_or_more, not_empty_array, empty_array, has_non_smi_element, finish, cant_transition_map, not_double; // Check for array construction with zero arguments or one. __ cmp(r0, Operand(0, RelocInfo::NONE)); __ b(ne, &argc_one_or_more); // Handle construction of an empty array. __ bind(&empty_array); AllocateEmptyJSArray(masm, r1, r2, r3, r4, r5, call_generic_code); __ IncrementCounter(counters->array_function_native(), 1, r3, r4); // Set up return value, remove receiver from stack and return. __ mov(r0, r2); __ add(sp, sp, Operand(kPointerSize)); __ Jump(lr); // Check for one argument. Bail out if argument is not smi or if it is // negative. __ bind(&argc_one_or_more); __ cmp(r0, Operand(1)); __ b(ne, &argc_two_or_more); STATIC_ASSERT(kSmiTag == 0); __ ldr(r2, MemOperand(sp)); // Get the argument from the stack. __ tst(r2, r2); __ b(ne, ¬_empty_array); __ Drop(1); // Adjust stack. __ mov(r0, Operand(0)); // Treat this as a call with argc of zero. __ b(&empty_array); __ bind(¬_empty_array); __ and_(r3, r2, Operand(kIntptrSignBit | kSmiTagMask), SetCC); __ b(ne, call_generic_code); // Handle construction of an empty array of a certain size. Bail out if size // is too large to actually allocate an elements array. STATIC_ASSERT(kSmiTag == 0); __ cmp(r2, Operand(JSObject::kInitialMaxFastElementArray << kSmiTagSize)); __ b(ge, call_generic_code); // r0: argc // r1: constructor // r2: array_size (smi) // sp[0]: argument AllocateJSArray(masm, r1, r2, r3, r4, r5, r6, r7, true, call_generic_code); __ IncrementCounter(counters->array_function_native(), 1, r2, r4); // Set up return value, remove receiver and argument from stack and return. __ mov(r0, r3); __ add(sp, sp, Operand(2 * kPointerSize)); __ Jump(lr); // Handle construction of an array from a list of arguments. __ bind(&argc_two_or_more); __ mov(r2, Operand(r0, LSL, kSmiTagSize)); // Convet argc to a smi. // r0: argc // r1: constructor // r2: array_size (smi) // sp[0]: last argument AllocateJSArray(masm, r1, r2, r3, r4, r5, r6, r7, false, call_generic_code); __ IncrementCounter(counters->array_function_native(), 1, r2, r6); // Fill arguments as array elements. Copy from the top of the stack (last // element) to the array backing store filling it backwards. Note: // elements_array_end points after the backing store therefore PreIndex is // used when filling the backing store. // r0: argc // r3: JSArray // r4: elements_array storage start (untagged) // r5: elements_array_end (untagged) // sp[0]: last argument Label loop, entry; __ mov(r7, sp); __ jmp(&entry); __ bind(&loop); __ ldr(r2, MemOperand(r7, kPointerSize, PostIndex)); if (FLAG_smi_only_arrays) { __ JumpIfNotSmi(r2, &has_non_smi_element); } __ str(r2, MemOperand(r5, -kPointerSize, PreIndex)); __ bind(&entry); __ cmp(r4, r5); __ b(lt, &loop); __ bind(&finish); __ mov(sp, r7); // Remove caller arguments and receiver from the stack, setup return value and // return. // r0: argc // r3: JSArray // sp[0]: receiver __ add(sp, sp, Operand(kPointerSize)); __ mov(r0, r3); __ Jump(lr); __ bind(&has_non_smi_element); // Double values are handled by the runtime. __ CheckMap( r2, r9, Heap::kHeapNumberMapRootIndex, ¬_double, DONT_DO_SMI_CHECK); __ bind(&cant_transition_map); __ UndoAllocationInNewSpace(r3, r4); __ b(call_generic_code); __ bind(¬_double); // Transition FAST_SMI_ELEMENTS to FAST_ELEMENTS. // r3: JSArray __ ldr(r2, FieldMemOperand(r3, HeapObject::kMapOffset)); __ LoadTransitionedArrayMapConditional(FAST_SMI_ELEMENTS, FAST_ELEMENTS, r2, r9, &cant_transition_map); __ str(r2, FieldMemOperand(r3, HeapObject::kMapOffset)); __ RecordWriteField(r3, HeapObject::kMapOffset, r2, r9, kLRHasNotBeenSaved, kDontSaveFPRegs, EMIT_REMEMBERED_SET, OMIT_SMI_CHECK); Label loop2; __ sub(r7, r7, Operand(kPointerSize)); __ bind(&loop2); __ ldr(r2, MemOperand(r7, kPointerSize, PostIndex)); __ str(r2, MemOperand(r5, -kPointerSize, PreIndex)); __ cmp(r4, r5); __ b(lt, &loop2); __ b(&finish); } void Builtins::Generate_InternalArrayCode(MacroAssembler* masm) { // ----------- S t a t e ------------- // -- r0 : number of arguments // -- lr : return address // -- sp[...]: constructor arguments // ----------------------------------- Label generic_array_code, one_or_more_arguments, two_or_more_arguments; // Get the InternalArray function. GenerateLoadInternalArrayFunction(masm, r1); if (FLAG_debug_code) { // Initial map for the builtin InternalArray functions should be maps. __ ldr(r2, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset)); __ tst(r2, Operand(kSmiTagMask)); __ Assert(ne, "Unexpected initial map for InternalArray function"); __ CompareObjectType(r2, r3, r4, MAP_TYPE); __ Assert(eq, "Unexpected initial map for InternalArray function"); } // Run the native code for the InternalArray function called as a normal // function. ArrayNativeCode(masm, &generic_array_code); // Jump to the generic array code if the specialized code cannot handle the // construction. __ bind(&generic_array_code); Handle array_code = masm->isolate()->builtins()->InternalArrayCodeGeneric(); __ Jump(array_code, RelocInfo::CODE_TARGET); } void Builtins::Generate_ArrayCode(MacroAssembler* masm) { // ----------- S t a t e ------------- // -- r0 : number of arguments // -- lr : return address // -- sp[...]: constructor arguments // ----------------------------------- Label generic_array_code, one_or_more_arguments, two_or_more_arguments; // Get the Array function. GenerateLoadArrayFunction(masm, r1); if (FLAG_debug_code) { // Initial map for the builtin Array functions should be maps. __ ldr(r2, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset)); __ tst(r2, Operand(kSmiTagMask)); __ Assert(ne, "Unexpected initial map for Array function"); __ CompareObjectType(r2, r3, r4, MAP_TYPE); __ Assert(eq, "Unexpected initial map for Array function"); } // Run the native code for the Array function called as a normal function. ArrayNativeCode(masm, &generic_array_code); // Jump to the generic array code if the specialized code cannot handle // the construction. __ bind(&generic_array_code); Handle array_code = masm->isolate()->builtins()->ArrayCodeGeneric(); __ Jump(array_code, RelocInfo::CODE_TARGET); } void Builtins::Generate_ArrayConstructCode(MacroAssembler* masm) { // ----------- S t a t e ------------- // -- r0 : number of arguments // -- r1 : constructor function // -- lr : return address // -- sp[...]: constructor arguments // ----------------------------------- Label generic_constructor; if (FLAG_debug_code) { // The array construct code is only set for the builtin and internal // Array functions which always have a map. // Initial map for the builtin Array function should be a map. __ ldr(r2, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset)); __ tst(r2, Operand(kSmiTagMask)); __ Assert(ne, "Unexpected initial map for Array function"); __ CompareObjectType(r2, r3, r4, MAP_TYPE); __ Assert(eq, "Unexpected initial map for Array function"); } // Run the native code for the Array function called as a constructor. ArrayNativeCode(masm, &generic_constructor); // Jump to the generic construct code in case the specialized code cannot // handle the construction. __ bind(&generic_constructor); Handle generic_construct_stub = masm->isolate()->builtins()->JSConstructStubGeneric(); __ Jump(generic_construct_stub, RelocInfo::CODE_TARGET); } void Builtins::Generate_StringConstructCode(MacroAssembler* masm) { // ----------- S t a t e ------------- // -- r0 : number of arguments // -- r1 : constructor function // -- lr : return address // -- sp[(argc - n - 1) * 4] : arg[n] (zero based) // -- sp[argc * 4] : receiver // ----------------------------------- Counters* counters = masm->isolate()->counters(); __ IncrementCounter(counters->string_ctor_calls(), 1, r2, r3); Register function = r1; if (FLAG_debug_code) { __ LoadGlobalFunction(Context::STRING_FUNCTION_INDEX, r2); __ cmp(function, Operand(r2)); __ Assert(eq, "Unexpected String function"); } // Load the first arguments in r0 and get rid of the rest. Label no_arguments; __ cmp(r0, Operand(0, RelocInfo::NONE)); __ b(eq, &no_arguments); // First args = sp[(argc - 1) * 4]. __ sub(r0, r0, Operand(1)); __ ldr(r0, MemOperand(sp, r0, LSL, kPointerSizeLog2, PreIndex)); // sp now point to args[0], drop args[0] + receiver. __ Drop(2); Register argument = r2; Label not_cached, argument_is_string; NumberToStringStub::GenerateLookupNumberStringCache( masm, r0, // Input. argument, // Result. r3, // Scratch. r4, // Scratch. r5, // Scratch. false, // Is it a Smi? ¬_cached); __ IncrementCounter(counters->string_ctor_cached_number(), 1, r3, r4); __ bind(&argument_is_string); // ----------- S t a t e ------------- // -- r2 : argument converted to string // -- r1 : constructor function // -- lr : return address // ----------------------------------- Label gc_required; __ AllocateInNewSpace(JSValue::kSize, r0, // Result. r3, // Scratch. r4, // Scratch. &gc_required, TAG_OBJECT); // Initialising the String Object. Register map = r3; __ LoadGlobalFunctionInitialMap(function, map, r4); if (FLAG_debug_code) { __ ldrb(r4, FieldMemOperand(map, Map::kInstanceSizeOffset)); __ cmp(r4, Operand(JSValue::kSize >> kPointerSizeLog2)); __ Assert(eq, "Unexpected string wrapper instance size"); __ ldrb(r4, FieldMemOperand(map, Map::kUnusedPropertyFieldsOffset)); __ cmp(r4, Operand(0, RelocInfo::NONE)); __ Assert(eq, "Unexpected unused properties of string wrapper"); } __ str(map, FieldMemOperand(r0, HeapObject::kMapOffset)); __ LoadRoot(r3, Heap::kEmptyFixedArrayRootIndex); __ str(r3, FieldMemOperand(r0, JSObject::kPropertiesOffset)); __ str(r3, FieldMemOperand(r0, JSObject::kElementsOffset)); __ str(argument, FieldMemOperand(r0, JSValue::kValueOffset)); // Ensure the object is fully initialized. STATIC_ASSERT(JSValue::kSize == 4 * kPointerSize); __ Ret(); // The argument was not found in the number to string cache. Check // if it's a string already before calling the conversion builtin. Label convert_argument; __ bind(¬_cached); __ JumpIfSmi(r0, &convert_argument); // Is it a String? __ ldr(r2, FieldMemOperand(r0, HeapObject::kMapOffset)); __ ldrb(r3, FieldMemOperand(r2, Map::kInstanceTypeOffset)); STATIC_ASSERT(kNotStringTag != 0); __ tst(r3, Operand(kIsNotStringMask)); __ b(ne, &convert_argument); __ mov(argument, r0); __ IncrementCounter(counters->string_ctor_conversions(), 1, r3, r4); __ b(&argument_is_string); // Invoke the conversion builtin and put the result into r2. __ bind(&convert_argument); __ push(function); // Preserve the function. __ IncrementCounter(counters->string_ctor_conversions(), 1, r3, r4); { FrameScope scope(masm, StackFrame::INTERNAL); __ push(r0); __ InvokeBuiltin(Builtins::TO_STRING, CALL_FUNCTION); } __ pop(function); __ mov(argument, r0); __ b(&argument_is_string); // Load the empty string into r2, remove the receiver from the // stack, and jump back to the case where the argument is a string. __ bind(&no_arguments); __ LoadRoot(argument, Heap::kEmptyStringRootIndex); __ Drop(1); __ b(&argument_is_string); // At this point the argument is already a string. Call runtime to // create a string wrapper. __ bind(&gc_required); __ IncrementCounter(counters->string_ctor_gc_required(), 1, r3, r4); { FrameScope scope(masm, StackFrame::INTERNAL); __ push(argument); __ CallRuntime(Runtime::kNewStringWrapper, 1); } __ Ret(); } static void GenerateTailCallToSharedCode(MacroAssembler* masm) { __ ldr(r2, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset)); __ ldr(r2, FieldMemOperand(r2, SharedFunctionInfo::kCodeOffset)); __ add(r2, r2, Operand(Code::kHeaderSize - kHeapObjectTag)); __ mov(pc, r2); } void Builtins::Generate_InRecompileQueue(MacroAssembler* masm) { GenerateTailCallToSharedCode(masm); } void Builtins::Generate_ParallelRecompile(MacroAssembler* masm) { { FrameScope scope(masm, StackFrame::INTERNAL); // Push a copy of the function onto the stack. __ push(r1); // Push call kind information. __ push(r5); __ push(r1); // Function is also the parameter to the runtime call. __ CallRuntime(Runtime::kParallelRecompile, 1); // Restore call kind information. __ pop(r5); // Restore receiver. __ pop(r1); // Tear down internal frame. } GenerateTailCallToSharedCode(masm); } static void Generate_JSConstructStubHelper(MacroAssembler* masm, bool is_api_function, bool count_constructions) { // ----------- S t a t e ------------- // -- r0 : number of arguments // -- r1 : constructor function // -- lr : return address // -- sp[...]: constructor arguments // ----------------------------------- // Should never count constructions for api objects. ASSERT(!is_api_function || !count_constructions); Isolate* isolate = masm->isolate(); // Enter a construct frame. { FrameScope scope(masm, StackFrame::CONSTRUCT); // Preserve the two incoming parameters on the stack. __ mov(r0, Operand(r0, LSL, kSmiTagSize)); __ push(r0); // Smi-tagged arguments count. __ push(r1); // Constructor function. // Try to allocate the object without transitioning into C code. If any of // the preconditions is not met, the code bails out to the runtime call. Label rt_call, allocated; if (FLAG_inline_new) { Label undo_allocation; #ifdef ENABLE_DEBUGGER_SUPPORT ExternalReference debug_step_in_fp = ExternalReference::debug_step_in_fp_address(isolate); __ mov(r2, Operand(debug_step_in_fp)); __ ldr(r2, MemOperand(r2)); __ tst(r2, r2); __ b(ne, &rt_call); #endif // Load the initial map and verify that it is in fact a map. // r1: constructor function __ ldr(r2, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset)); __ JumpIfSmi(r2, &rt_call); __ CompareObjectType(r2, r3, r4, MAP_TYPE); __ b(ne, &rt_call); // Check that the constructor is not constructing a JSFunction (see // comments in Runtime_NewObject in runtime.cc). In which case the // initial map's instance type would be JS_FUNCTION_TYPE. // r1: constructor function // r2: initial map __ CompareInstanceType(r2, r3, JS_FUNCTION_TYPE); __ b(eq, &rt_call); if (count_constructions) { Label allocate; // Decrease generous allocation count. __ ldr(r3, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset)); MemOperand constructor_count = FieldMemOperand(r3, SharedFunctionInfo::kConstructionCountOffset); __ ldrb(r4, constructor_count); __ sub(r4, r4, Operand(1), SetCC); __ strb(r4, constructor_count); __ b(ne, &allocate); __ Push(r1, r2); __ push(r1); // constructor // The call will replace the stub, so the countdown is only done once. __ CallRuntime(Runtime::kFinalizeInstanceSize, 1); __ pop(r2); __ pop(r1); __ bind(&allocate); } // Now allocate the JSObject on the heap. // r1: constructor function // r2: initial map __ ldrb(r3, FieldMemOperand(r2, Map::kInstanceSizeOffset)); __ AllocateInNewSpace(r3, r4, r5, r6, &rt_call, SIZE_IN_WORDS); // Allocated the JSObject, now initialize the fields. Map is set to // initial map and properties and elements are set to empty fixed array. // r1: constructor function // r2: initial map // r3: object size // r4: JSObject (not tagged) __ LoadRoot(r6, Heap::kEmptyFixedArrayRootIndex); __ mov(r5, r4); ASSERT_EQ(0 * kPointerSize, JSObject::kMapOffset); __ str(r2, MemOperand(r5, kPointerSize, PostIndex)); ASSERT_EQ(1 * kPointerSize, JSObject::kPropertiesOffset); __ str(r6, MemOperand(r5, kPointerSize, PostIndex)); ASSERT_EQ(2 * kPointerSize, JSObject::kElementsOffset); __ str(r6, MemOperand(r5, kPointerSize, PostIndex)); // Fill all the in-object properties with the appropriate filler. // r1: constructor function // r2: initial map // r3: object size (in words) // r4: JSObject (not tagged) // r5: First in-object property of JSObject (not tagged) __ add(r6, r4, Operand(r3, LSL, kPointerSizeLog2)); // End of object. ASSERT_EQ(3 * kPointerSize, JSObject::kHeaderSize); __ LoadRoot(r7, Heap::kUndefinedValueRootIndex); if (count_constructions) { __ ldr(r0, FieldMemOperand(r2, Map::kInstanceSizesOffset)); __ Ubfx(r0, r0, Map::kPreAllocatedPropertyFieldsByte * kBitsPerByte, kBitsPerByte); __ add(r0, r5, Operand(r0, LSL, kPointerSizeLog2)); // r0: offset of first field after pre-allocated fields if (FLAG_debug_code) { __ cmp(r0, r6); __ Assert(le, "Unexpected number of pre-allocated property fields."); } __ InitializeFieldsWithFiller(r5, r0, r7); // To allow for truncation. __ LoadRoot(r7, Heap::kOnePointerFillerMapRootIndex); } __ InitializeFieldsWithFiller(r5, r6, r7); // Add the object tag to make the JSObject real, so that we can continue // and jump into the continuation code at any time from now on. Any // failures need to undo the allocation, so that the heap is in a // consistent state and verifiable. __ add(r4, r4, Operand(kHeapObjectTag)); // Check if a non-empty properties array is needed. Continue with // allocated object if not fall through to runtime call if it is. // r1: constructor function // r4: JSObject // r5: start of next object (not tagged) __ ldrb(r3, FieldMemOperand(r2, Map::kUnusedPropertyFieldsOffset)); // The field instance sizes contains both pre-allocated property fields // and in-object properties. __ ldr(r0, FieldMemOperand(r2, Map::kInstanceSizesOffset)); __ Ubfx(r6, r0, Map::kPreAllocatedPropertyFieldsByte * kBitsPerByte, kBitsPerByte); __ add(r3, r3, Operand(r6)); __ Ubfx(r6, r0, Map::kInObjectPropertiesByte * kBitsPerByte, kBitsPerByte); __ sub(r3, r3, Operand(r6), SetCC); // Done if no extra properties are to be allocated. __ b(eq, &allocated); __ Assert(pl, "Property allocation count failed."); // Scale the number of elements by pointer size and add the header for // FixedArrays to the start of the next object calculation from above. // r1: constructor // r3: number of elements in properties array // r4: JSObject // r5: start of next object __ add(r0, r3, Operand(FixedArray::kHeaderSize / kPointerSize)); __ AllocateInNewSpace( r0, r5, r6, r2, &undo_allocation, static_cast(RESULT_CONTAINS_TOP | SIZE_IN_WORDS)); // Initialize the FixedArray. // r1: constructor // r3: number of elements in properties array // r4: JSObject // r5: FixedArray (not tagged) __ LoadRoot(r6, Heap::kFixedArrayMapRootIndex); __ mov(r2, r5); ASSERT_EQ(0 * kPointerSize, JSObject::kMapOffset); __ str(r6, MemOperand(r2, kPointerSize, PostIndex)); ASSERT_EQ(1 * kPointerSize, FixedArray::kLengthOffset); __ mov(r0, Operand(r3, LSL, kSmiTagSize)); __ str(r0, MemOperand(r2, kPointerSize, PostIndex)); // Initialize the fields to undefined. // r1: constructor function // r2: First element of FixedArray (not tagged) // r3: number of elements in properties array // r4: JSObject // r5: FixedArray (not tagged) __ add(r6, r2, Operand(r3, LSL, kPointerSizeLog2)); // End of object. ASSERT_EQ(2 * kPointerSize, FixedArray::kHeaderSize); { Label loop, entry; if (count_constructions) { __ LoadRoot(r7, Heap::kUndefinedValueRootIndex); } else if (FLAG_debug_code) { __ LoadRoot(r8, Heap::kUndefinedValueRootIndex); __ cmp(r7, r8); __ Assert(eq, "Undefined value not loaded."); } __ b(&entry); __ bind(&loop); __ str(r7, MemOperand(r2, kPointerSize, PostIndex)); __ bind(&entry); __ cmp(r2, r6); __ b(lt, &loop); } // Store the initialized FixedArray into the properties field of // the JSObject // r1: constructor function // r4: JSObject // r5: FixedArray (not tagged) __ add(r5, r5, Operand(kHeapObjectTag)); // Add the heap tag. __ str(r5, FieldMemOperand(r4, JSObject::kPropertiesOffset)); // Continue with JSObject being successfully allocated // r1: constructor function // r4: JSObject __ jmp(&allocated); // Undo the setting of the new top so that the heap is verifiable. For // example, the map's unused properties potentially do not match the // allocated objects unused properties. // r4: JSObject (previous new top) __ bind(&undo_allocation); __ UndoAllocationInNewSpace(r4, r5); } // Allocate the new receiver object using the runtime call. // r1: constructor function __ bind(&rt_call); __ push(r1); // argument for Runtime_NewObject __ CallRuntime(Runtime::kNewObject, 1); __ mov(r4, r0); // Receiver for constructor call allocated. // r4: JSObject __ bind(&allocated); __ push(r4); __ push(r4); // Reload the number of arguments and the constructor from the stack. // sp[0]: receiver // sp[1]: receiver // sp[2]: constructor function // sp[3]: number of arguments (smi-tagged) __ ldr(r1, MemOperand(sp, 2 * kPointerSize)); __ ldr(r3, MemOperand(sp, 3 * kPointerSize)); // Set up pointer to last argument. __ add(r2, fp, Operand(StandardFrameConstants::kCallerSPOffset)); // Set up number of arguments for function call below __ mov(r0, Operand(r3, LSR, kSmiTagSize)); // Copy arguments and receiver to the expression stack. // r0: number of arguments // r1: constructor function // r2: address of last argument (caller sp) // r3: number of arguments (smi-tagged) // sp[0]: receiver // sp[1]: receiver // sp[2]: constructor function // sp[3]: number of arguments (smi-tagged) Label loop, entry; __ b(&entry); __ bind(&loop); __ ldr(ip, MemOperand(r2, r3, LSL, kPointerSizeLog2 - 1)); __ push(ip); __ bind(&entry); __ sub(r3, r3, Operand(2), SetCC); __ b(ge, &loop); // Call the function. // r0: number of arguments // r1: constructor function if (is_api_function) { __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset)); Handle code = masm->isolate()->builtins()->HandleApiCallConstruct(); ParameterCount expected(0); __ InvokeCode(code, expected, expected, RelocInfo::CODE_TARGET, CALL_FUNCTION, CALL_AS_METHOD); } else { ParameterCount actual(r0); __ InvokeFunction(r1, actual, CALL_FUNCTION, NullCallWrapper(), CALL_AS_METHOD); } // Store offset of return address for deoptimizer. if (!is_api_function && !count_constructions) { masm->isolate()->heap()->SetConstructStubDeoptPCOffset(masm->pc_offset()); } // Restore context from the frame. // r0: result // sp[0]: receiver // sp[1]: constructor function // sp[2]: number of arguments (smi-tagged) __ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset)); // If the result is an object (in the ECMA sense), we should get rid // of the receiver and use the result; see ECMA-262 section 13.2.2-7 // on page 74. Label use_receiver, exit; // If the result is a smi, it is *not* an object in the ECMA sense. // r0: result // sp[0]: receiver (newly allocated object) // sp[1]: constructor function // sp[2]: number of arguments (smi-tagged) __ JumpIfSmi(r0, &use_receiver); // If the type of the result (stored in its map) is less than // FIRST_SPEC_OBJECT_TYPE, it is not an object in the ECMA sense. __ CompareObjectType(r0, r3, r3, FIRST_SPEC_OBJECT_TYPE); __ b(ge, &exit); // Throw away the result of the constructor invocation and use the // on-stack receiver as the result. __ bind(&use_receiver); __ ldr(r0, MemOperand(sp)); // Remove receiver from the stack, remove caller arguments, and // return. __ bind(&exit); // r0: result // sp[0]: receiver (newly allocated object) // sp[1]: constructor function // sp[2]: number of arguments (smi-tagged) __ ldr(r1, MemOperand(sp, 2 * kPointerSize)); // Leave construct frame. } __ add(sp, sp, Operand(r1, LSL, kPointerSizeLog2 - 1)); __ add(sp, sp, Operand(kPointerSize)); __ IncrementCounter(isolate->counters()->constructed_objects(), 1, r1, r2); __ Jump(lr); } void Builtins::Generate_JSConstructStubCountdown(MacroAssembler* masm) { Generate_JSConstructStubHelper(masm, false, true); } void Builtins::Generate_JSConstructStubGeneric(MacroAssembler* masm) { Generate_JSConstructStubHelper(masm, false, false); } void Builtins::Generate_JSConstructStubApi(MacroAssembler* masm) { Generate_JSConstructStubHelper(masm, true, false); } static void Generate_JSEntryTrampolineHelper(MacroAssembler* masm, bool is_construct) { // Called from Generate_JS_Entry // r0: code entry // r1: function // r2: receiver // r3: argc // r4: argv // r5-r7, cp may be clobbered // Clear the context before we push it when entering the internal frame. __ mov(cp, Operand(0, RelocInfo::NONE)); // Enter an internal frame. { FrameScope scope(masm, StackFrame::INTERNAL); // Set up the context from the function argument. __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset)); __ InitializeRootRegister(); // Push the function and the receiver onto the stack. __ push(r1); __ push(r2); // Copy arguments to the stack in a loop. // r1: function // r3: argc // r4: argv, i.e. points to first arg Label loop, entry; __ add(r2, r4, Operand(r3, LSL, kPointerSizeLog2)); // r2 points past last arg. __ b(&entry); __ bind(&loop); __ ldr(r0, MemOperand(r4, kPointerSize, PostIndex)); // read next parameter __ ldr(r0, MemOperand(r0)); // dereference handle __ push(r0); // push parameter __ bind(&entry); __ cmp(r4, r2); __ b(ne, &loop); // Initialize all JavaScript callee-saved registers, since they will be seen // by the garbage collector as part of handlers. __ LoadRoot(r4, Heap::kUndefinedValueRootIndex); __ mov(r5, Operand(r4)); __ mov(r6, Operand(r4)); __ mov(r7, Operand(r4)); if (kR9Available == 1) { __ mov(r9, Operand(r4)); } // Invoke the code and pass argc as r0. __ mov(r0, Operand(r3)); if (is_construct) { CallConstructStub stub(NO_CALL_FUNCTION_FLAGS); __ CallStub(&stub); } else { ParameterCount actual(r0); __ InvokeFunction(r1, actual, CALL_FUNCTION, NullCallWrapper(), CALL_AS_METHOD); } // Exit the JS frame and remove the parameters (except function), and // return. // Respect ABI stack constraint. } __ Jump(lr); // r0: result } void Builtins::Generate_JSEntryTrampoline(MacroAssembler* masm) { Generate_JSEntryTrampolineHelper(masm, false); } void Builtins::Generate_JSConstructEntryTrampoline(MacroAssembler* masm) { Generate_JSEntryTrampolineHelper(masm, true); } void Builtins::Generate_LazyCompile(MacroAssembler* masm) { // Enter an internal frame. { FrameScope scope(masm, StackFrame::INTERNAL); // Preserve the function. __ push(r1); // Push call kind information. __ push(r5); // Push the function on the stack as the argument to the runtime function. __ push(r1); __ CallRuntime(Runtime::kLazyCompile, 1); // Calculate the entry point. __ add(r2, r0, Operand(Code::kHeaderSize - kHeapObjectTag)); // Restore call kind information. __ pop(r5); // Restore saved function. __ pop(r1); // Tear down internal frame. } // Do a tail-call of the compiled function. __ Jump(r2); } void Builtins::Generate_LazyRecompile(MacroAssembler* masm) { // Enter an internal frame. { FrameScope scope(masm, StackFrame::INTERNAL); // Preserve the function. __ push(r1); // Push call kind information. __ push(r5); // Push the function on the stack as the argument to the runtime function. __ push(r1); __ CallRuntime(Runtime::kLazyRecompile, 1); // Calculate the entry point. __ add(r2, r0, Operand(Code::kHeaderSize - kHeapObjectTag)); // Restore call kind information. __ pop(r5); // Restore saved function. __ pop(r1); // Tear down internal frame. } // Do a tail-call of the compiled function. __ Jump(r2); } static void Generate_NotifyDeoptimizedHelper(MacroAssembler* masm, Deoptimizer::BailoutType type) { { FrameScope scope(masm, StackFrame::INTERNAL); // Pass the function and deoptimization type to the runtime system. __ mov(r0, Operand(Smi::FromInt(static_cast(type)))); __ push(r0); __ CallRuntime(Runtime::kNotifyDeoptimized, 1); } // Get the full codegen state from the stack and untag it -> r6. __ ldr(r6, MemOperand(sp, 0 * kPointerSize)); __ SmiUntag(r6); // Switch on the state. Label with_tos_register, unknown_state; __ cmp(r6, Operand(FullCodeGenerator::NO_REGISTERS)); __ b(ne, &with_tos_register); __ add(sp, sp, Operand(1 * kPointerSize)); // Remove state. __ Ret(); __ bind(&with_tos_register); __ ldr(r0, MemOperand(sp, 1 * kPointerSize)); __ cmp(r6, Operand(FullCodeGenerator::TOS_REG)); __ b(ne, &unknown_state); __ add(sp, sp, Operand(2 * kPointerSize)); // Remove state. __ Ret(); __ bind(&unknown_state); __ stop("no cases left"); } void Builtins::Generate_NotifyDeoptimized(MacroAssembler* masm) { Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::EAGER); } void Builtins::Generate_NotifyLazyDeoptimized(MacroAssembler* masm) { Generate_NotifyDeoptimizedHelper(masm, Deoptimizer::LAZY); } void Builtins::Generate_NotifyOSR(MacroAssembler* masm) { // For now, we are relying on the fact that Runtime::NotifyOSR // doesn't do any garbage collection which allows us to save/restore // the registers without worrying about which of them contain // pointers. This seems a bit fragile. __ stm(db_w, sp, kJSCallerSaved | kCalleeSaved | lr.bit() | fp.bit()); { FrameScope scope(masm, StackFrame::INTERNAL); __ CallRuntime(Runtime::kNotifyOSR, 0); } __ ldm(ia_w, sp, kJSCallerSaved | kCalleeSaved | lr.bit() | fp.bit()); __ Ret(); } void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) { CpuFeatures::TryForceFeatureScope scope(VFP3); if (!CPU::SupportsCrankshaft()) { __ Abort("Unreachable code: Cannot optimize without VFP3 support."); return; } // Lookup the function in the JavaScript frame and push it as an // argument to the on-stack replacement function. __ ldr(r0, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset)); { FrameScope scope(masm, StackFrame::INTERNAL); __ push(r0); __ CallRuntime(Runtime::kCompileForOnStackReplacement, 1); } // If the result was -1 it means that we couldn't optimize the // function. Just return and continue in the unoptimized version. Label skip; __ cmp(r0, Operand(Smi::FromInt(-1))); __ b(ne, &skip); __ Ret(); __ bind(&skip); // Untag the AST id and push it on the stack. __ SmiUntag(r0); __ push(r0); // Generate the code for doing the frame-to-frame translation using // the deoptimizer infrastructure. Deoptimizer::EntryGenerator generator(masm, Deoptimizer::OSR); generator.Generate(); } void Builtins::Generate_FunctionCall(MacroAssembler* masm) { // 1. Make sure we have at least one argument. // r0: actual number of arguments { Label done; __ cmp(r0, Operand(0)); __ b(ne, &done); __ LoadRoot(r2, Heap::kUndefinedValueRootIndex); __ push(r2); __ add(r0, r0, Operand(1)); __ bind(&done); } // 2. Get the function to call (passed as receiver) from the stack, check // if it is a function. // r0: actual number of arguments Label slow, non_function; __ ldr(r1, MemOperand(sp, r0, LSL, kPointerSizeLog2)); __ JumpIfSmi(r1, &non_function); __ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE); __ b(ne, &slow); // 3a. Patch the first argument if necessary when calling a function. // r0: actual number of arguments // r1: function Label shift_arguments; __ mov(r4, Operand(0, RelocInfo::NONE)); // indicate regular JS_FUNCTION { Label convert_to_object, use_global_receiver, patch_receiver; // Change context eagerly in case we need the global receiver. __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset)); // Do not transform the receiver for strict mode functions. __ ldr(r2, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset)); __ ldr(r3, FieldMemOperand(r2, SharedFunctionInfo::kCompilerHintsOffset)); __ tst(r3, Operand(1 << (SharedFunctionInfo::kStrictModeFunction + kSmiTagSize))); __ b(ne, &shift_arguments); // Do not transform the receiver for native (Compilerhints already in r3). __ tst(r3, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize))); __ b(ne, &shift_arguments); // Compute the receiver in non-strict mode. __ add(r2, sp, Operand(r0, LSL, kPointerSizeLog2)); __ ldr(r2, MemOperand(r2, -kPointerSize)); // r0: actual number of arguments // r1: function // r2: first argument __ JumpIfSmi(r2, &convert_to_object); __ LoadRoot(r3, Heap::kUndefinedValueRootIndex); __ cmp(r2, r3); __ b(eq, &use_global_receiver); __ LoadRoot(r3, Heap::kNullValueRootIndex); __ cmp(r2, r3); __ b(eq, &use_global_receiver); STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE); __ CompareObjectType(r2, r3, r3, FIRST_SPEC_OBJECT_TYPE); __ b(ge, &shift_arguments); __ bind(&convert_to_object); { // Enter an internal frame in order to preserve argument count. FrameScope scope(masm, StackFrame::INTERNAL); __ mov(r0, Operand(r0, LSL, kSmiTagSize)); // Smi-tagged. __ push(r0); __ push(r2); __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION); __ mov(r2, r0); __ pop(r0); __ mov(r0, Operand(r0, ASR, kSmiTagSize)); // Exit the internal frame. } // Restore the function to r1, and the flag to r4. __ ldr(r1, MemOperand(sp, r0, LSL, kPointerSizeLog2)); __ mov(r4, Operand(0, RelocInfo::NONE)); __ jmp(&patch_receiver); // Use the global receiver object from the called function as the // receiver. __ bind(&use_global_receiver); const int kGlobalIndex = Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize; __ ldr(r2, FieldMemOperand(cp, kGlobalIndex)); __ ldr(r2, FieldMemOperand(r2, GlobalObject::kNativeContextOffset)); __ ldr(r2, FieldMemOperand(r2, kGlobalIndex)); __ ldr(r2, FieldMemOperand(r2, GlobalObject::kGlobalReceiverOffset)); __ bind(&patch_receiver); __ add(r3, sp, Operand(r0, LSL, kPointerSizeLog2)); __ str(r2, MemOperand(r3, -kPointerSize)); __ jmp(&shift_arguments); } // 3b. Check for function proxy. __ bind(&slow); __ mov(r4, Operand(1, RelocInfo::NONE)); // indicate function proxy __ cmp(r2, Operand(JS_FUNCTION_PROXY_TYPE)); __ b(eq, &shift_arguments); __ bind(&non_function); __ mov(r4, Operand(2, RelocInfo::NONE)); // indicate non-function // 3c. Patch the first argument when calling a non-function. The // CALL_NON_FUNCTION builtin expects the non-function callee as // receiver, so overwrite the first argument which will ultimately // become the receiver. // r0: actual number of arguments // r1: function // r4: call type (0: JS function, 1: function proxy, 2: non-function) __ add(r2, sp, Operand(r0, LSL, kPointerSizeLog2)); __ str(r1, MemOperand(r2, -kPointerSize)); // 4. Shift arguments and return address one slot down on the stack // (overwriting the original receiver). Adjust argument count to make // the original first argument the new receiver. // r0: actual number of arguments // r1: function // r4: call type (0: JS function, 1: function proxy, 2: non-function) __ bind(&shift_arguments); { Label loop; // Calculate the copy start address (destination). Copy end address is sp. __ add(r2, sp, Operand(r0, LSL, kPointerSizeLog2)); __ bind(&loop); __ ldr(ip, MemOperand(r2, -kPointerSize)); __ str(ip, MemOperand(r2)); __ sub(r2, r2, Operand(kPointerSize)); __ cmp(r2, sp); __ b(ne, &loop); // Adjust the actual number of arguments and remove the top element // (which is a copy of the last argument). __ sub(r0, r0, Operand(1)); __ pop(); } // 5a. Call non-function via tail call to CALL_NON_FUNCTION builtin, // or a function proxy via CALL_FUNCTION_PROXY. // r0: actual number of arguments // r1: function // r4: call type (0: JS function, 1: function proxy, 2: non-function) { Label function, non_proxy; __ tst(r4, r4); __ b(eq, &function); // Expected number of arguments is 0 for CALL_NON_FUNCTION. __ mov(r2, Operand(0, RelocInfo::NONE)); __ SetCallKind(r5, CALL_AS_METHOD); __ cmp(r4, Operand(1)); __ b(ne, &non_proxy); __ push(r1); // re-add proxy object as additional argument __ add(r0, r0, Operand(1)); __ GetBuiltinEntry(r3, Builtins::CALL_FUNCTION_PROXY); __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(), RelocInfo::CODE_TARGET); __ bind(&non_proxy); __ GetBuiltinEntry(r3, Builtins::CALL_NON_FUNCTION); __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(), RelocInfo::CODE_TARGET); __ bind(&function); } // 5b. Get the code to call from the function and check that the number of // expected arguments matches what we're providing. If so, jump // (tail-call) to the code in register edx without checking arguments. // r0: actual number of arguments // r1: function __ ldr(r3, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset)); __ ldr(r2, FieldMemOperand(r3, SharedFunctionInfo::kFormalParameterCountOffset)); __ mov(r2, Operand(r2, ASR, kSmiTagSize)); __ ldr(r3, FieldMemOperand(r1, JSFunction::kCodeEntryOffset)); __ SetCallKind(r5, CALL_AS_METHOD); __ cmp(r2, r0); // Check formal and actual parameter counts. __ Jump(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(), RelocInfo::CODE_TARGET, ne); ParameterCount expected(0); __ InvokeCode(r3, expected, expected, JUMP_FUNCTION, NullCallWrapper(), CALL_AS_METHOD); } void Builtins::Generate_FunctionApply(MacroAssembler* masm) { const int kIndexOffset = -5 * kPointerSize; const int kLimitOffset = -4 * kPointerSize; const int kArgsOffset = 2 * kPointerSize; const int kRecvOffset = 3 * kPointerSize; const int kFunctionOffset = 4 * kPointerSize; { FrameScope frame_scope(masm, StackFrame::INTERNAL); __ ldr(r0, MemOperand(fp, kFunctionOffset)); // get the function __ push(r0); __ ldr(r0, MemOperand(fp, kArgsOffset)); // get the args array __ push(r0); __ InvokeBuiltin(Builtins::APPLY_PREPARE, CALL_FUNCTION); // Check the stack for overflow. We are not trying to catch // interruptions (e.g. debug break and preemption) here, so the "real stack // limit" is checked. Label okay; __ LoadRoot(r2, Heap::kRealStackLimitRootIndex); // Make r2 the space we have left. The stack might already be overflowed // here which will cause r2 to become negative. __ sub(r2, sp, r2); // Check if the arguments will overflow the stack. __ cmp(r2, Operand(r0, LSL, kPointerSizeLog2 - kSmiTagSize)); __ b(gt, &okay); // Signed comparison. // Out of stack space. __ ldr(r1, MemOperand(fp, kFunctionOffset)); __ push(r1); __ push(r0); __ InvokeBuiltin(Builtins::APPLY_OVERFLOW, CALL_FUNCTION); // End of stack check. // Push current limit and index. __ bind(&okay); __ push(r0); // limit __ mov(r1, Operand(0, RelocInfo::NONE)); // initial index __ push(r1); // Get the receiver. __ ldr(r0, MemOperand(fp, kRecvOffset)); // Check that the function is a JS function (otherwise it must be a proxy). Label push_receiver; __ ldr(r1, MemOperand(fp, kFunctionOffset)); __ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE); __ b(ne, &push_receiver); // Change context eagerly to get the right global object if necessary. __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset)); // Load the shared function info while the function is still in r1. __ ldr(r2, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset)); // Compute the receiver. // Do not transform the receiver for strict mode functions. Label call_to_object, use_global_receiver; __ ldr(r2, FieldMemOperand(r2, SharedFunctionInfo::kCompilerHintsOffset)); __ tst(r2, Operand(1 << (SharedFunctionInfo::kStrictModeFunction + kSmiTagSize))); __ b(ne, &push_receiver); // Do not transform the receiver for strict mode functions. __ tst(r2, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize))); __ b(ne, &push_receiver); // Compute the receiver in non-strict mode. __ JumpIfSmi(r0, &call_to_object); __ LoadRoot(r1, Heap::kNullValueRootIndex); __ cmp(r0, r1); __ b(eq, &use_global_receiver); __ LoadRoot(r1, Heap::kUndefinedValueRootIndex); __ cmp(r0, r1); __ b(eq, &use_global_receiver); // Check if the receiver is already a JavaScript object. // r0: receiver STATIC_ASSERT(LAST_SPEC_OBJECT_TYPE == LAST_TYPE); __ CompareObjectType(r0, r1, r1, FIRST_SPEC_OBJECT_TYPE); __ b(ge, &push_receiver); // Convert the receiver to a regular object. // r0: receiver __ bind(&call_to_object); __ push(r0); __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION); __ b(&push_receiver); // Use the current global receiver object as the receiver. __ bind(&use_global_receiver); const int kGlobalOffset = Context::kHeaderSize + Context::GLOBAL_OBJECT_INDEX * kPointerSize; __ ldr(r0, FieldMemOperand(cp, kGlobalOffset)); __ ldr(r0, FieldMemOperand(r0, GlobalObject::kNativeContextOffset)); __ ldr(r0, FieldMemOperand(r0, kGlobalOffset)); __ ldr(r0, FieldMemOperand(r0, GlobalObject::kGlobalReceiverOffset)); // Push the receiver. // r0: receiver __ bind(&push_receiver); __ push(r0); // Copy all arguments from the array to the stack. Label entry, loop; __ ldr(r0, MemOperand(fp, kIndexOffset)); __ b(&entry); // Load the current argument from the arguments array and push it to the // stack. // r0: current argument index __ bind(&loop); __ ldr(r1, MemOperand(fp, kArgsOffset)); __ push(r1); __ push(r0); // Call the runtime to access the property in the arguments array. __ CallRuntime(Runtime::kGetProperty, 2); __ push(r0); // Use inline caching to access the arguments. __ ldr(r0, MemOperand(fp, kIndexOffset)); __ add(r0, r0, Operand(1 << kSmiTagSize)); __ str(r0, MemOperand(fp, kIndexOffset)); // Test if the copy loop has finished copying all the elements from the // arguments object. __ bind(&entry); __ ldr(r1, MemOperand(fp, kLimitOffset)); __ cmp(r0, r1); __ b(ne, &loop); // Invoke the function. Label call_proxy; ParameterCount actual(r0); __ mov(r0, Operand(r0, ASR, kSmiTagSize)); __ ldr(r1, MemOperand(fp, kFunctionOffset)); __ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE); __ b(ne, &call_proxy); __ InvokeFunction(r1, actual, CALL_FUNCTION, NullCallWrapper(), CALL_AS_METHOD); frame_scope.GenerateLeaveFrame(); __ add(sp, sp, Operand(3 * kPointerSize)); __ Jump(lr); // Invoke the function proxy. __ bind(&call_proxy); __ push(r1); // add function proxy as last argument __ add(r0, r0, Operand(1)); __ mov(r2, Operand(0, RelocInfo::NONE)); __ SetCallKind(r5, CALL_AS_METHOD); __ GetBuiltinEntry(r3, Builtins::CALL_FUNCTION_PROXY); __ Call(masm->isolate()->builtins()->ArgumentsAdaptorTrampoline(), RelocInfo::CODE_TARGET); // Tear down the internal frame and remove function, receiver and args. } __ add(sp, sp, Operand(3 * kPointerSize)); __ Jump(lr); } static void EnterArgumentsAdaptorFrame(MacroAssembler* masm) { __ mov(r0, Operand(r0, LSL, kSmiTagSize)); __ mov(r4, Operand(Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR))); __ stm(db_w, sp, r0.bit() | r1.bit() | r4.bit() | fp.bit() | lr.bit()); __ add(fp, sp, Operand(3 * kPointerSize)); } static void LeaveArgumentsAdaptorFrame(MacroAssembler* masm) { // ----------- S t a t e ------------- // -- r0 : result being passed through // ----------------------------------- // Get the number of arguments passed (as a smi), tear down the frame and // then tear down the parameters. __ ldr(r1, MemOperand(fp, -3 * kPointerSize)); __ mov(sp, fp); __ ldm(ia_w, sp, fp.bit() | lr.bit()); __ add(sp, sp, Operand(r1, LSL, kPointerSizeLog2 - kSmiTagSize)); __ add(sp, sp, Operand(kPointerSize)); // adjust for receiver } void Builtins::Generate_ArgumentsAdaptorTrampoline(MacroAssembler* masm) { // ----------- S t a t e ------------- // -- r0 : actual number of arguments // -- r1 : function (passed through to callee) // -- r2 : expected number of arguments // -- r3 : code entry to call // -- r5 : call kind information // ----------------------------------- Label invoke, dont_adapt_arguments; Label enough, too_few; __ cmp(r0, r2); __ b(lt, &too_few); __ cmp(r2, Operand(SharedFunctionInfo::kDontAdaptArgumentsSentinel)); __ b(eq, &dont_adapt_arguments); { // Enough parameters: actual >= expected __ bind(&enough); EnterArgumentsAdaptorFrame(masm); // Calculate copy start address into r0 and copy end address into r2. // r0: actual number of arguments as a smi // r1: function // r2: expected number of arguments // r3: code entry to call __ add(r0, fp, Operand(r0, LSL, kPointerSizeLog2 - kSmiTagSize)); // adjust for return address and receiver __ add(r0, r0, Operand(2 * kPointerSize)); __ sub(r2, r0, Operand(r2, LSL, kPointerSizeLog2)); // Copy the arguments (including the receiver) to the new stack frame. // r0: copy start address // r1: function // r2: copy end address // r3: code entry to call Label copy; __ bind(©); __ ldr(ip, MemOperand(r0, 0)); __ push(ip); __ cmp(r0, r2); // Compare before moving to next argument. __ sub(r0, r0, Operand(kPointerSize)); __ b(ne, ©); __ b(&invoke); } { // Too few parameters: Actual < expected __ bind(&too_few); EnterArgumentsAdaptorFrame(masm); // Calculate copy start address into r0 and copy end address is fp. // r0: actual number of arguments as a smi // r1: function // r2: expected number of arguments // r3: code entry to call __ add(r0, fp, Operand(r0, LSL, kPointerSizeLog2 - kSmiTagSize)); // Copy the arguments (including the receiver) to the new stack frame. // r0: copy start address // r1: function // r2: expected number of arguments // r3: code entry to call Label copy; __ bind(©); // Adjust load for return address and receiver. __ ldr(ip, MemOperand(r0, 2 * kPointerSize)); __ push(ip); __ cmp(r0, fp); // Compare before moving to next argument. __ sub(r0, r0, Operand(kPointerSize)); __ b(ne, ©); // Fill the remaining expected arguments with undefined. // r1: function // r2: expected number of arguments // r3: code entry to call __ LoadRoot(ip, Heap::kUndefinedValueRootIndex); __ sub(r2, fp, Operand(r2, LSL, kPointerSizeLog2)); __ sub(r2, r2, Operand(4 * kPointerSize)); // Adjust for frame. Label fill; __ bind(&fill); __ push(ip); __ cmp(sp, r2); __ b(ne, &fill); } // Call the entry point. __ bind(&invoke); __ Call(r3); // Store offset of return address for deoptimizer. masm->isolate()->heap()->SetArgumentsAdaptorDeoptPCOffset(masm->pc_offset()); // Exit frame and return. LeaveArgumentsAdaptorFrame(masm); __ Jump(lr); // ------------------------------------------- // Dont adapt arguments. // ------------------------------------------- __ bind(&dont_adapt_arguments); __ Jump(r3); } #undef __ } } // namespace v8::internal #endif // V8_TARGET_ARCH_ARM