// 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. #include "v8.h" #include "ic-inl.h" #include "codegen-inl.h" #include "stub-cache.h" namespace v8 { namespace internal { #define __ ACCESS_MASM(masm) static void ProbeTable(MacroAssembler* masm, Code::Flags flags, StubCache::Table table, Register name, Register offset) { ExternalReference key_offset(SCTableReference::keyReference(table)); ExternalReference value_offset(SCTableReference::valueReference(table)); Label miss; // Save the offset on the stack. __ push(offset); // Check that the key in the entry matches the name. __ mov(ip, Operand(key_offset)); __ ldr(ip, MemOperand(ip, offset, LSL, 1)); __ cmp(name, Operand(ip)); __ b(ne, &miss); // Get the code entry from the cache. __ mov(ip, Operand(value_offset)); __ ldr(offset, MemOperand(ip, offset, LSL, 1)); // Check that the flags match what we're looking for. __ ldr(offset, FieldMemOperand(offset, Code::kFlagsOffset)); __ and_(offset, offset, Operand(~Code::kFlagsNotUsedInLookup)); __ cmp(offset, Operand(flags)); __ b(ne, &miss); // Restore offset and re-load code entry from cache. __ pop(offset); __ mov(ip, Operand(value_offset)); __ ldr(offset, MemOperand(ip, offset, LSL, 1)); // Jump to the first instruction in the code stub. __ add(offset, offset, Operand(Code::kHeaderSize - kHeapObjectTag)); __ Jump(offset); // Miss: Restore offset and fall through. __ bind(&miss); __ pop(offset); } void StubCache::GenerateProbe(MacroAssembler* masm, Code::Flags flags, Register receiver, Register name, Register scratch, Register extra) { Label miss; // Make sure that code is valid. The shifting code relies on the // entry size being 8. ASSERT(sizeof(Entry) == 8); // Make sure the flags does not name a specific type. ASSERT(Code::ExtractTypeFromFlags(flags) == 0); // Make sure that there are no register conflicts. ASSERT(!scratch.is(receiver)); ASSERT(!scratch.is(name)); // Check that the receiver isn't a smi. __ tst(receiver, Operand(kSmiTagMask)); __ b(eq, &miss); // Get the map of the receiver and compute the hash. __ ldr(scratch, FieldMemOperand(name, String::kHashFieldOffset)); __ ldr(ip, FieldMemOperand(receiver, HeapObject::kMapOffset)); __ add(scratch, scratch, Operand(ip)); __ eor(scratch, scratch, Operand(flags)); __ and_(scratch, scratch, Operand((kPrimaryTableSize - 1) << kHeapObjectTagSize)); // Probe the primary table. ProbeTable(masm, flags, kPrimary, name, scratch); // Primary miss: Compute hash for secondary probe. __ sub(scratch, scratch, Operand(name)); __ add(scratch, scratch, Operand(flags)); __ and_(scratch, scratch, Operand((kSecondaryTableSize - 1) << kHeapObjectTagSize)); // Probe the secondary table. ProbeTable(masm, flags, kSecondary, name, scratch); // Cache miss: Fall-through and let caller handle the miss by // entering the runtime system. __ bind(&miss); } void StubCompiler::GenerateLoadGlobalFunctionPrototype(MacroAssembler* masm, int index, Register prototype) { // Load the global or builtins object from the current context. __ ldr(prototype, MemOperand(cp, Context::SlotOffset(Context::GLOBAL_INDEX))); // Load the global context from the global or builtins object. __ ldr(prototype, FieldMemOperand(prototype, GlobalObject::kGlobalContextOffset)); // Load the function from the global context. __ ldr(prototype, MemOperand(prototype, Context::SlotOffset(index))); // Load the initial map. The global functions all have initial maps. __ ldr(prototype, FieldMemOperand(prototype, JSFunction::kPrototypeOrInitialMapOffset)); // Load the prototype from the initial map. __ ldr(prototype, FieldMemOperand(prototype, Map::kPrototypeOffset)); } // Load a fast property out of a holder object (src). In-object properties // are loaded directly otherwise the property is loaded from the properties // fixed array. void StubCompiler::GenerateFastPropertyLoad(MacroAssembler* masm, Register dst, Register src, JSObject* holder, int index) { // Adjust for the number of properties stored in the holder. index -= holder->map()->inobject_properties(); if (index < 0) { // Get the property straight out of the holder. int offset = holder->map()->instance_size() + (index * kPointerSize); __ ldr(dst, FieldMemOperand(src, offset)); } else { // Calculate the offset into the properties array. int offset = index * kPointerSize + FixedArray::kHeaderSize; __ ldr(dst, FieldMemOperand(src, JSObject::kPropertiesOffset)); __ ldr(dst, FieldMemOperand(dst, offset)); } } void StubCompiler::GenerateLoadArrayLength(MacroAssembler* masm, Register receiver, Register scratch, Label* miss_label) { // Check that the receiver isn't a smi. __ tst(receiver, Operand(kSmiTagMask)); __ b(eq, miss_label); // Check that the object is a JS array. __ CompareObjectType(receiver, scratch, scratch, JS_ARRAY_TYPE); __ b(ne, miss_label); // Load length directly from the JS array. __ ldr(r0, FieldMemOperand(receiver, JSArray::kLengthOffset)); __ Ret(); } // Generate code to check if an object is a string. If the object is a // heap object, its map's instance type is left in the scratch1 register. // If this is not needed, scratch1 and scratch2 may be the same register. static void GenerateStringCheck(MacroAssembler* masm, Register receiver, Register scratch1, Register scratch2, Label* smi, Label* non_string_object) { // Check that the receiver isn't a smi. __ tst(receiver, Operand(kSmiTagMask)); __ b(eq, smi); // Check that the object is a string. __ ldr(scratch1, FieldMemOperand(receiver, HeapObject::kMapOffset)); __ ldrb(scratch1, FieldMemOperand(scratch1, Map::kInstanceTypeOffset)); __ and_(scratch2, scratch1, Operand(kIsNotStringMask)); // The cast is to resolve the overload for the argument of 0x0. __ cmp(scratch2, Operand(static_cast(kStringTag))); __ b(ne, non_string_object); } // Generate code to load the length from a string object and return the length. // If the receiver object is not a string or a wrapped string object the // execution continues at the miss label. The register containing the // receiver is potentially clobbered. void StubCompiler::GenerateLoadStringLength(MacroAssembler* masm, Register receiver, Register scratch1, Register scratch2, Label* miss) { Label check_wrapper; // Check if the object is a string leaving the instance type in the // scratch1 register. GenerateStringCheck(masm, receiver, scratch1, scratch2, miss, &check_wrapper); // Load length directly from the string. __ ldr(r0, FieldMemOperand(receiver, String::kLengthOffset)); __ mov(r0, Operand(r0, LSL, kSmiTagSize)); __ Ret(); // Check if the object is a JSValue wrapper. __ bind(&check_wrapper); __ cmp(scratch1, Operand(JS_VALUE_TYPE)); __ b(ne, miss); // Unwrap the value and check if the wrapped value is a string. __ ldr(scratch1, FieldMemOperand(receiver, JSValue::kValueOffset)); GenerateStringCheck(masm, scratch1, scratch2, scratch2, miss, miss); __ ldr(r0, FieldMemOperand(scratch1, String::kLengthOffset)); __ mov(r0, Operand(r0, LSL, kSmiTagSize)); __ Ret(); } void StubCompiler::GenerateLoadFunctionPrototype(MacroAssembler* masm, Register receiver, Register scratch1, Register scratch2, Label* miss_label) { __ TryGetFunctionPrototype(receiver, scratch1, scratch2, miss_label); __ mov(r0, scratch1); __ Ret(); } // Generate StoreField code, value is passed in r0 register. // After executing generated code, the receiver_reg and name_reg // may be clobbered. void StubCompiler::GenerateStoreField(MacroAssembler* masm, JSObject* object, int index, Map* transition, Register receiver_reg, Register name_reg, Register scratch, Label* miss_label) { // r0 : value Label exit; // Check that the receiver isn't a smi. __ tst(receiver_reg, Operand(kSmiTagMask)); __ b(eq, miss_label); // Check that the map of the receiver hasn't changed. __ ldr(scratch, FieldMemOperand(receiver_reg, HeapObject::kMapOffset)); __ cmp(scratch, Operand(Handle(object->map()))); __ b(ne, miss_label); // Perform global security token check if needed. if (object->IsJSGlobalProxy()) { __ CheckAccessGlobalProxy(receiver_reg, scratch, miss_label); } // Stub never generated for non-global objects that require access // checks. ASSERT(object->IsJSGlobalProxy() || !object->IsAccessCheckNeeded()); // Perform map transition for the receiver if necessary. if ((transition != NULL) && (object->map()->unused_property_fields() == 0)) { // The properties must be extended before we can store the value. // We jump to a runtime call that extends the properties array. __ push(receiver_reg); __ mov(r2, Operand(Handle(transition))); __ stm(db_w, sp, r2.bit() | r0.bit()); __ TailCallRuntime( ExternalReference(IC_Utility(IC::kSharedStoreIC_ExtendStorage)), 3, 1); return; } if (transition != NULL) { // Update the map of the object; no write barrier updating is // needed because the map is never in new space. __ mov(ip, Operand(Handle(transition))); __ str(ip, FieldMemOperand(receiver_reg, HeapObject::kMapOffset)); } // Adjust for the number of properties stored in the object. Even in the // face of a transition we can use the old map here because the size of the // object and the number of in-object properties is not going to change. index -= object->map()->inobject_properties(); if (index < 0) { // Set the property straight into the object. int offset = object->map()->instance_size() + (index * kPointerSize); __ str(r0, FieldMemOperand(receiver_reg, offset)); // Skip updating write barrier if storing a smi. __ tst(r0, Operand(kSmiTagMask)); __ b(eq, &exit); // Update the write barrier for the array address. // Pass the value being stored in the now unused name_reg. __ mov(name_reg, Operand(offset)); __ RecordWrite(receiver_reg, name_reg, scratch); } else { // Write to the properties array. int offset = index * kPointerSize + FixedArray::kHeaderSize; // Get the properties array __ ldr(scratch, FieldMemOperand(receiver_reg, JSObject::kPropertiesOffset)); __ str(r0, FieldMemOperand(scratch, offset)); // Skip updating write barrier if storing a smi. __ tst(r0, Operand(kSmiTagMask)); __ b(eq, &exit); // Update the write barrier for the array address. // Ok to clobber receiver_reg and name_reg, since we return. __ mov(name_reg, Operand(offset)); __ RecordWrite(scratch, name_reg, receiver_reg); } // Return the value (register r0). __ bind(&exit); __ Ret(); } void StubCompiler::GenerateLoadMiss(MacroAssembler* masm, Code::Kind kind) { ASSERT(kind == Code::LOAD_IC || kind == Code::KEYED_LOAD_IC); Code* code = NULL; if (kind == Code::LOAD_IC) { code = Builtins::builtin(Builtins::LoadIC_Miss); } else { code = Builtins::builtin(Builtins::KeyedLoadIC_Miss); } Handle ic(code); __ Jump(ic, RelocInfo::CODE_TARGET); } static void GenerateCallFunction(MacroAssembler* masm, Object* object, const ParameterCount& arguments, Label* miss) { // ----------- S t a t e ------------- // -- r0: receiver // -- r1: function to call // ----------------------------------- // Check that the function really is a function. __ BranchOnSmi(r1, miss); __ CompareObjectType(r1, r2, r2, JS_FUNCTION_TYPE); __ b(ne, miss); // Patch the receiver on the stack with the global proxy if // necessary. if (object->IsGlobalObject()) { __ ldr(r3, FieldMemOperand(r0, GlobalObject::kGlobalReceiverOffset)); __ str(r3, MemOperand(sp, arguments.immediate() * kPointerSize)); } // Invoke the function. __ InvokeFunction(r1, arguments, JUMP_FUNCTION); } static void GenerateCallConstFunction(MacroAssembler* masm, JSFunction* function, const ParameterCount& arguments) { ASSERT(function->is_compiled()); // Get the function and setup the context. __ mov(r1, Operand(Handle(function))); __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset)); // Jump to the cached code (tail call). Handle code(function->code()); ParameterCount expected(function->shared()->formal_parameter_count()); __ InvokeCode(code, expected, arguments, RelocInfo::CODE_TARGET, JUMP_FUNCTION); } template static void CompileLoadInterceptor(Compiler* compiler, StubCompiler* stub_compiler, MacroAssembler* masm, JSObject* object, JSObject* holder, String* name, LookupResult* lookup, Register receiver, Register scratch1, Register scratch2, Label* miss) { ASSERT(holder->HasNamedInterceptor()); ASSERT(!holder->GetNamedInterceptor()->getter()->IsUndefined()); // Check that the receiver isn't a smi. __ BranchOnSmi(receiver, miss); // Check that the maps haven't changed. Register reg = stub_compiler->CheckPrototypes(object, receiver, holder, scratch1, scratch2, name, miss); if (lookup->IsValid() && lookup->IsCacheable()) { compiler->CompileCacheable(masm, stub_compiler, receiver, reg, scratch1, scratch2, holder, lookup, name, miss); } else { compiler->CompileRegular(masm, receiver, reg, scratch2, holder, miss); } } static void PushInterceptorArguments(MacroAssembler* masm, Register receiver, Register holder, Register name, JSObject* holder_obj) { __ push(receiver); __ push(holder); __ push(name); InterceptorInfo* interceptor = holder_obj->GetNamedInterceptor(); ASSERT(!Heap::InNewSpace(interceptor)); Register scratch = receiver; __ mov(scratch, Operand(Handle(interceptor))); __ push(scratch); __ ldr(scratch, FieldMemOperand(scratch, InterceptorInfo::kDataOffset)); __ push(scratch); } static void CompileCallLoadPropertyWithInterceptor(MacroAssembler* masm, Register receiver, Register holder, Register name, JSObject* holder_obj) { PushInterceptorArguments(masm, receiver, holder, name, holder_obj); ExternalReference ref = ExternalReference(IC_Utility(IC::kLoadPropertyWithInterceptorOnly)); __ mov(r0, Operand(5)); __ mov(r1, Operand(ref)); CEntryStub stub(1); __ CallStub(&stub); } class LoadInterceptorCompiler BASE_EMBEDDED { public: explicit LoadInterceptorCompiler(Register name) : name_(name) {} void CompileCacheable(MacroAssembler* masm, StubCompiler* stub_compiler, Register receiver, Register holder, Register scratch1, Register scratch2, JSObject* holder_obj, LookupResult* lookup, String* name, Label* miss_label) { AccessorInfo* callback = 0; bool optimize = false; // So far the most popular follow ups for interceptor loads are FIELD // and CALLBACKS, so inline only them, other cases may be added // later. if (lookup->type() == FIELD) { optimize = true; } else if (lookup->type() == CALLBACKS) { Object* callback_object = lookup->GetCallbackObject(); if (callback_object->IsAccessorInfo()) { callback = AccessorInfo::cast(callback_object); optimize = callback->getter() != NULL; } } if (!optimize) { CompileRegular(masm, receiver, holder, scratch2, holder_obj, miss_label); return; } // Note: starting a frame here makes GC aware of pointers pushed below. __ EnterInternalFrame(); if (lookup->type() == CALLBACKS) { __ push(receiver); } __ push(holder); __ push(name_); CompileCallLoadPropertyWithInterceptor(masm, receiver, holder, name_, holder_obj); Label interceptor_failed; // Compare with no_interceptor_result_sentinel. __ LoadRoot(scratch1, Heap::kNoInterceptorResultSentinelRootIndex); __ cmp(r0, scratch1); __ b(eq, &interceptor_failed); __ LeaveInternalFrame(); __ Ret(); __ bind(&interceptor_failed); __ pop(name_); __ pop(holder); if (lookup->type() == CALLBACKS) { __ pop(receiver); } __ LeaveInternalFrame(); if (lookup->type() == FIELD) { holder = stub_compiler->CheckPrototypes(holder_obj, holder, lookup->holder(), scratch1, scratch2, name, miss_label); stub_compiler->GenerateFastPropertyLoad(masm, r0, holder, lookup->holder(), lookup->GetFieldIndex()); __ Ret(); } else { ASSERT(lookup->type() == CALLBACKS); ASSERT(lookup->GetCallbackObject()->IsAccessorInfo()); ASSERT(callback != NULL); ASSERT(callback->getter() != NULL); Label cleanup; __ pop(scratch2); __ push(receiver); __ push(scratch2); holder = stub_compiler->CheckPrototypes(holder_obj, holder, lookup->holder(), scratch1, scratch2, name, &cleanup); __ push(holder); __ Move(holder, Handle(callback)); __ push(holder); __ ldr(scratch1, FieldMemOperand(holder, AccessorInfo::kDataOffset)); __ push(scratch1); __ push(name_); ExternalReference ref = ExternalReference(IC_Utility(IC::kLoadCallbackProperty)); __ TailCallRuntime(ref, 5, 1); __ bind(&cleanup); __ pop(scratch1); __ pop(scratch2); __ push(scratch1); } } void CompileRegular(MacroAssembler* masm, Register receiver, Register holder, Register scratch, JSObject* holder_obj, Label* miss_label) { PushInterceptorArguments(masm, receiver, holder, name_, holder_obj); ExternalReference ref = ExternalReference( IC_Utility(IC::kLoadPropertyWithInterceptorForLoad)); __ TailCallRuntime(ref, 5, 1); } private: Register name_; }; class CallInterceptorCompiler BASE_EMBEDDED { public: CallInterceptorCompiler(const ParameterCount& arguments, Register name) : arguments_(arguments), argc_(arguments.immediate()), name_(name) {} void CompileCacheable(MacroAssembler* masm, StubCompiler* stub_compiler, Register receiver, Register holder, Register scratch1, Register scratch2, JSObject* holder_obj, LookupResult* lookup, String* name, Label* miss_label) { JSFunction* function = 0; bool optimize = false; // So far the most popular case for failed interceptor is // CONSTANT_FUNCTION sitting below. if (lookup->type() == CONSTANT_FUNCTION) { function = lookup->GetConstantFunction(); // JSArray holder is a special case for call constant function // (see the corresponding code). if (function->is_compiled() && !holder_obj->IsJSArray()) { optimize = true; } } if (!optimize) { CompileRegular(masm, receiver, holder, scratch2, holder_obj, miss_label); return; } // Constant functions cannot sit on global object. ASSERT(!lookup->holder()->IsGlobalObject()); __ EnterInternalFrame(); __ push(holder); // Save the holder. __ push(name_); // Save the name. CompileCallLoadPropertyWithInterceptor(masm, receiver, holder, name_, holder_obj); ASSERT(!r0.is(name_)); ASSERT(!r0.is(scratch1)); __ pop(name_); // Restore the name. __ pop(scratch1); // Restore the holder. __ LeaveInternalFrame(); // Compare with no_interceptor_result_sentinel. __ LoadRoot(scratch2, Heap::kNoInterceptorResultSentinelRootIndex); __ cmp(r0, scratch2); Label invoke; __ b(ne, &invoke); stub_compiler->CheckPrototypes(holder_obj, scratch1, lookup->holder(), scratch1, scratch2, name, miss_label); GenerateCallConstFunction(masm, function, arguments_); __ bind(&invoke); } void CompileRegular(MacroAssembler* masm, Register receiver, Register holder, Register scratch, JSObject* holder_obj, Label* miss_label) { __ EnterInternalFrame(); // Save the name_ register across the call. __ push(name_); PushInterceptorArguments(masm, receiver, holder, name_, holder_obj); ExternalReference ref = ExternalReference( IC_Utility(IC::kLoadPropertyWithInterceptorForCall)); __ mov(r0, Operand(5)); __ mov(r1, Operand(ref)); CEntryStub stub(1); __ CallStub(&stub); // Restore the name_ register. __ pop(name_); __ LeaveInternalFrame(); } private: const ParameterCount& arguments_; int argc_; Register name_; }; #undef __ #define __ ACCESS_MASM(masm()) Register StubCompiler::CheckPrototypes(JSObject* object, Register object_reg, JSObject* holder, Register holder_reg, Register scratch, String* name, Label* miss) { // Check that the maps haven't changed. Register result = masm()->CheckMaps(object, object_reg, holder, holder_reg, scratch, miss); // If we've skipped any global objects, it's not enough to verify // that their maps haven't changed. while (object != holder) { if (object->IsGlobalObject()) { GlobalObject* global = GlobalObject::cast(object); Object* probe = global->EnsurePropertyCell(name); if (probe->IsFailure()) { set_failure(Failure::cast(probe)); return result; } JSGlobalPropertyCell* cell = JSGlobalPropertyCell::cast(probe); ASSERT(cell->value()->IsTheHole()); __ mov(scratch, Operand(Handle(cell))); __ ldr(scratch, FieldMemOperand(scratch, JSGlobalPropertyCell::kValueOffset)); __ LoadRoot(ip, Heap::kTheHoleValueRootIndex); __ cmp(scratch, ip); __ b(ne, miss); } object = JSObject::cast(object->GetPrototype()); } // Return the register containin the holder. return result; } void StubCompiler::GenerateLoadField(JSObject* object, JSObject* holder, Register receiver, Register scratch1, Register scratch2, int index, String* name, Label* miss) { // Check that the receiver isn't a smi. __ tst(receiver, Operand(kSmiTagMask)); __ b(eq, miss); // Check that the maps haven't changed. Register reg = CheckPrototypes(object, receiver, holder, scratch1, scratch2, name, miss); GenerateFastPropertyLoad(masm(), r0, reg, holder, index); __ Ret(); } void StubCompiler::GenerateLoadConstant(JSObject* object, JSObject* holder, Register receiver, Register scratch1, Register scratch2, Object* value, String* name, Label* miss) { // Check that the receiver isn't a smi. __ tst(receiver, Operand(kSmiTagMask)); __ b(eq, miss); // Check that the maps haven't changed. Register reg = CheckPrototypes(object, receiver, holder, scratch1, scratch2, name, miss); // Return the constant value. __ mov(r0, Operand(Handle(value))); __ Ret(); } bool StubCompiler::GenerateLoadCallback(JSObject* object, JSObject* holder, Register receiver, Register name_reg, Register scratch1, Register scratch2, AccessorInfo* callback, String* name, Label* miss, Failure** failure) { // Check that the receiver isn't a smi. __ tst(receiver, Operand(kSmiTagMask)); __ b(eq, miss); // Check that the maps haven't changed. Register reg = CheckPrototypes(object, receiver, holder, scratch1, scratch2, name, miss); // Push the arguments on the JS stack of the caller. __ push(receiver); // receiver __ push(reg); // holder __ mov(ip, Operand(Handle(callback))); // callback data __ push(ip); __ ldr(reg, FieldMemOperand(ip, AccessorInfo::kDataOffset)); __ push(reg); __ push(name_reg); // name // Do tail-call to the runtime system. ExternalReference load_callback_property = ExternalReference(IC_Utility(IC::kLoadCallbackProperty)); __ TailCallRuntime(load_callback_property, 5, 1); return true; } void StubCompiler::GenerateLoadInterceptor(JSObject* object, JSObject* holder, LookupResult* lookup, Register receiver, Register name_reg, Register scratch1, Register scratch2, String* name, Label* miss) { LoadInterceptorCompiler compiler(name_reg); CompileLoadInterceptor(&compiler, this, masm(), object, holder, name, lookup, receiver, scratch1, scratch2, miss); } Object* StubCompiler::CompileLazyCompile(Code::Flags flags) { // ----------- S t a t e ------------- // -- r1: function // -- lr: return address // ----------------------------------- // Enter an internal frame. __ EnterInternalFrame(); // Preserve the function. __ push(r1); // 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 saved function. __ pop(r1); // Tear down temporary frame. __ LeaveInternalFrame(); // Do a tail-call of the compiled function. __ Jump(r2); return GetCodeWithFlags(flags, "LazyCompileStub"); } Object* CallStubCompiler::CompileCallField(Object* object, JSObject* holder, int index, String* name) { // ----------- S t a t e ------------- // -- lr: return address // ----------------------------------- Label miss; const int argc = arguments().immediate(); // Get the receiver of the function from the stack into r0. __ ldr(r0, MemOperand(sp, argc * kPointerSize)); // Check that the receiver isn't a smi. __ tst(r0, Operand(kSmiTagMask)); __ b(eq, &miss); // Do the right check and compute the holder register. Register reg = CheckPrototypes(JSObject::cast(object), r0, holder, r3, r2, name, &miss); GenerateFastPropertyLoad(masm(), r1, reg, holder, index); GenerateCallFunction(masm(), object, arguments(), &miss); // Handle call cache miss. __ bind(&miss); Handle ic = ComputeCallMiss(arguments().immediate()); __ Jump(ic, RelocInfo::CODE_TARGET); // Return the generated code. return GetCode(FIELD, name); } Object* CallStubCompiler::CompileCallConstant(Object* object, JSObject* holder, JSFunction* function, String* name, CheckType check) { // ----------- S t a t e ------------- // -- lr: return address // ----------------------------------- Label miss; // Get the receiver from the stack const int argc = arguments().immediate(); __ ldr(r1, MemOperand(sp, argc * kPointerSize)); // Check that the receiver isn't a smi. if (check != NUMBER_CHECK) { __ tst(r1, Operand(kSmiTagMask)); __ b(eq, &miss); } // Make sure that it's okay not to patch the on stack receiver // unless we're doing a receiver map check. ASSERT(!object->IsGlobalObject() || check == RECEIVER_MAP_CHECK); switch (check) { case RECEIVER_MAP_CHECK: // Check that the maps haven't changed. CheckPrototypes(JSObject::cast(object), r1, holder, r3, r2, name, &miss); // Patch the receiver on the stack with the global proxy if // necessary. if (object->IsGlobalObject()) { __ ldr(r3, FieldMemOperand(r1, GlobalObject::kGlobalReceiverOffset)); __ str(r3, MemOperand(sp, argc * kPointerSize)); } break; case STRING_CHECK: if (!function->IsBuiltin()) { // Calling non-builtins with a value as receiver requires boxing. __ jmp(&miss); } else { // Check that the object is a two-byte string or a symbol. __ CompareObjectType(r1, r2, r2, FIRST_NONSTRING_TYPE); __ b(hs, &miss); // Check that the maps starting from the prototype haven't changed. GenerateLoadGlobalFunctionPrototype(masm(), Context::STRING_FUNCTION_INDEX, r2); CheckPrototypes(JSObject::cast(object->GetPrototype()), r2, holder, r3, r1, name, &miss); } break; case NUMBER_CHECK: { if (!function->IsBuiltin()) { // Calling non-builtins with a value as receiver requires boxing. __ jmp(&miss); } else { Label fast; // Check that the object is a smi or a heap number. __ tst(r1, Operand(kSmiTagMask)); __ b(eq, &fast); __ CompareObjectType(r1, r2, r2, HEAP_NUMBER_TYPE); __ b(ne, &miss); __ bind(&fast); // Check that the maps starting from the prototype haven't changed. GenerateLoadGlobalFunctionPrototype(masm(), Context::NUMBER_FUNCTION_INDEX, r2); CheckPrototypes(JSObject::cast(object->GetPrototype()), r2, holder, r3, r1, name, &miss); } break; } case BOOLEAN_CHECK: { if (!function->IsBuiltin()) { // Calling non-builtins with a value as receiver requires boxing. __ jmp(&miss); } else { Label fast; // Check that the object is a boolean. __ LoadRoot(ip, Heap::kTrueValueRootIndex); __ cmp(r1, ip); __ b(eq, &fast); __ LoadRoot(ip, Heap::kFalseValueRootIndex); __ cmp(r1, ip); __ b(ne, &miss); __ bind(&fast); // Check that the maps starting from the prototype haven't changed. GenerateLoadGlobalFunctionPrototype(masm(), Context::BOOLEAN_FUNCTION_INDEX, r2); CheckPrototypes(JSObject::cast(object->GetPrototype()), r2, holder, r3, r1, name, &miss); } break; } case JSARRAY_HAS_FAST_ELEMENTS_CHECK: CheckPrototypes(JSObject::cast(object), r1, holder, r3, r2, name, &miss); // Make sure object->HasFastElements(). // Get the elements array of the object. __ ldr(r3, FieldMemOperand(r1, JSObject::kElementsOffset)); // Check that the object is in fast mode (not dictionary). __ ldr(r2, FieldMemOperand(r3, HeapObject::kMapOffset)); __ LoadRoot(ip, Heap::kFixedArrayMapRootIndex); __ cmp(r2, ip); __ b(ne, &miss); break; default: UNREACHABLE(); } GenerateCallConstFunction(masm(), function, arguments()); // Handle call cache miss. __ bind(&miss); Handle ic = ComputeCallMiss(arguments().immediate()); __ Jump(ic, RelocInfo::CODE_TARGET); // Return the generated code. String* function_name = NULL; if (function->shared()->name()->IsString()) { function_name = String::cast(function->shared()->name()); } return GetCode(CONSTANT_FUNCTION, function_name); } Object* CallStubCompiler::CompileCallInterceptor(Object* object, JSObject* holder, String* name) { // ----------- S t a t e ------------- // -- lr: return address // ----------------------------------- Label miss; // Get the number of arguments. const int argc = arguments().immediate(); LookupResult lookup; LookupPostInterceptor(holder, name, &lookup); // Get the receiver from the stack into r0. __ ldr(r0, MemOperand(sp, argc * kPointerSize)); // Load the name from the stack into r1. __ ldr(r1, MemOperand(sp, (argc + 1) * kPointerSize)); CallInterceptorCompiler compiler(arguments(), r1); CompileLoadInterceptor(&compiler, this, masm(), JSObject::cast(object), holder, name, &lookup, r0, r2, r3, &miss); // Restore receiver. __ ldr(r0, MemOperand(sp, argc * kPointerSize)); GenerateCallFunction(masm(), object, arguments(), &miss); // Handle call cache miss. __ bind(&miss); Handle ic = ComputeCallMiss(arguments().immediate()); __ Jump(ic, RelocInfo::CODE_TARGET); // Return the generated code. return GetCode(INTERCEPTOR, name); } Object* CallStubCompiler::CompileCallGlobal(JSObject* object, GlobalObject* holder, JSGlobalPropertyCell* cell, JSFunction* function, String* name) { // ----------- S t a t e ------------- // -- lr: return address // ----------------------------------- Label miss; // Get the number of arguments. const int argc = arguments().immediate(); // Get the receiver from the stack. __ ldr(r0, MemOperand(sp, argc * kPointerSize)); // If the object is the holder then we know that it's a global // object which can only happen for contextual calls. In this case, // the receiver cannot be a smi. if (object != holder) { __ tst(r0, Operand(kSmiTagMask)); __ b(eq, &miss); } // Check that the maps haven't changed. CheckPrototypes(object, r0, holder, r3, r2, name, &miss); // Get the value from the cell. __ mov(r3, Operand(Handle(cell))); __ ldr(r1, FieldMemOperand(r3, JSGlobalPropertyCell::kValueOffset)); // Check that the cell contains the same function. if (Heap::InNewSpace(function)) { // We can't embed a pointer to a function in new space so we have // to verify that the shared function info is unchanged. This has // the nice side effect that multiple closures based on the same // function can all use this call IC. Before we load through the // function, we have to verify that it still is a function. __ tst(r1, Operand(kSmiTagMask)); __ b(eq, &miss); __ CompareObjectType(r1, r3, r3, JS_FUNCTION_TYPE); __ b(ne, &miss); // Check the shared function info. Make sure it hasn't changed. __ mov(r3, Operand(Handle(function->shared()))); __ ldr(r2, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset)); __ cmp(r2, r3); __ b(ne, &miss); } else { __ cmp(r1, Operand(Handle(function))); __ b(ne, &miss); } // Patch the receiver on the stack with the global proxy if // necessary. if (object->IsGlobalObject()) { __ ldr(r3, FieldMemOperand(r0, GlobalObject::kGlobalReceiverOffset)); __ str(r3, MemOperand(sp, argc * kPointerSize)); } // Setup the context (function already in r1). __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset)); // Jump to the cached code (tail call). __ IncrementCounter(&Counters::call_global_inline, 1, r2, r3); ASSERT(function->is_compiled()); Handle code(function->code()); ParameterCount expected(function->shared()->formal_parameter_count()); __ InvokeCode(code, expected, arguments(), RelocInfo::CODE_TARGET, JUMP_FUNCTION); // Handle call cache miss. __ bind(&miss); __ IncrementCounter(&Counters::call_global_inline_miss, 1, r1, r3); Handle ic = ComputeCallMiss(arguments().immediate()); __ Jump(ic, RelocInfo::CODE_TARGET); // Return the generated code. return GetCode(NORMAL, name); } Object* StoreStubCompiler::CompileStoreField(JSObject* object, int index, Map* transition, String* name) { // ----------- S t a t e ------------- // -- r0 : value // -- r2 : name // -- lr : return address // -- [sp] : receiver // ----------------------------------- Label miss; // Get the receiver from the stack. __ ldr(r3, MemOperand(sp, 0 * kPointerSize)); // name register might be clobbered. GenerateStoreField(masm(), object, index, transition, r3, r2, r1, &miss); __ bind(&miss); __ mov(r2, Operand(Handle(name))); // restore name Handle ic(Builtins::builtin(Builtins::StoreIC_Miss)); __ Jump(ic, RelocInfo::CODE_TARGET); // Return the generated code. return GetCode(transition == NULL ? FIELD : MAP_TRANSITION, name); } Object* StoreStubCompiler::CompileStoreCallback(JSObject* object, AccessorInfo* callback, String* name) { // ----------- S t a t e ------------- // -- r0 : value // -- r2 : name // -- lr : return address // -- [sp] : receiver // ----------------------------------- Label miss; // Get the object from the stack. __ ldr(r3, MemOperand(sp, 0 * kPointerSize)); // Check that the object isn't a smi. __ tst(r3, Operand(kSmiTagMask)); __ b(eq, &miss); // Check that the map of the object hasn't changed. __ ldr(r1, FieldMemOperand(r3, HeapObject::kMapOffset)); __ cmp(r1, Operand(Handle(object->map()))); __ b(ne, &miss); // Perform global security token check if needed. if (object->IsJSGlobalProxy()) { __ CheckAccessGlobalProxy(r3, r1, &miss); } // Stub never generated for non-global objects that require access // checks. ASSERT(object->IsJSGlobalProxy() || !object->IsAccessCheckNeeded()); __ ldr(ip, MemOperand(sp)); // receiver __ push(ip); __ mov(ip, Operand(Handle(callback))); // callback info __ push(ip); __ push(r2); // name __ push(r0); // value // Do tail-call to the runtime system. ExternalReference store_callback_property = ExternalReference(IC_Utility(IC::kStoreCallbackProperty)); __ TailCallRuntime(store_callback_property, 4, 1); // Handle store cache miss. __ bind(&miss); Handle ic(Builtins::builtin(Builtins::StoreIC_Miss)); __ Jump(ic, RelocInfo::CODE_TARGET); // Return the generated code. return GetCode(CALLBACKS, name); } Object* StoreStubCompiler::CompileStoreInterceptor(JSObject* receiver, String* name) { // ----------- S t a t e ------------- // -- r0 : value // -- r2 : name // -- lr : return address // -- [sp] : receiver // ----------------------------------- Label miss; // Get the object from the stack. __ ldr(r3, MemOperand(sp, 0 * kPointerSize)); // Check that the object isn't a smi. __ tst(r3, Operand(kSmiTagMask)); __ b(eq, &miss); // Check that the map of the object hasn't changed. __ ldr(r1, FieldMemOperand(r3, HeapObject::kMapOffset)); __ cmp(r1, Operand(Handle(receiver->map()))); __ b(ne, &miss); // Perform global security token check if needed. if (receiver->IsJSGlobalProxy()) { __ CheckAccessGlobalProxy(r3, r1, &miss); } // Stub never generated for non-global objects that require access // checks. ASSERT(receiver->IsJSGlobalProxy() || !receiver->IsAccessCheckNeeded()); __ ldr(ip, MemOperand(sp)); // receiver __ push(ip); __ push(r2); // name __ push(r0); // value // Do tail-call to the runtime system. ExternalReference store_ic_property = ExternalReference(IC_Utility(IC::kStoreInterceptorProperty)); __ TailCallRuntime(store_ic_property, 3, 1); // Handle store cache miss. __ bind(&miss); Handle ic(Builtins::builtin(Builtins::StoreIC_Miss)); __ Jump(ic, RelocInfo::CODE_TARGET); // Return the generated code. return GetCode(INTERCEPTOR, name); } Object* StoreStubCompiler::CompileStoreGlobal(GlobalObject* object, JSGlobalPropertyCell* cell, String* name) { // ----------- S t a t e ------------- // -- r0 : value // -- r2 : name // -- lr : return address // -- [sp] : receiver // ----------------------------------- Label miss; // Check that the map of the global has not changed. __ ldr(r1, MemOperand(sp, 0 * kPointerSize)); __ ldr(r3, FieldMemOperand(r1, HeapObject::kMapOffset)); __ cmp(r3, Operand(Handle(object->map()))); __ b(ne, &miss); // Store the value in the cell. __ mov(r2, Operand(Handle(cell))); __ str(r0, FieldMemOperand(r2, JSGlobalPropertyCell::kValueOffset)); __ IncrementCounter(&Counters::named_store_global_inline, 1, r1, r3); __ Ret(); // Handle store cache miss. __ bind(&miss); __ IncrementCounter(&Counters::named_store_global_inline_miss, 1, r1, r3); Handle ic(Builtins::builtin(Builtins::StoreIC_Miss)); __ Jump(ic, RelocInfo::CODE_TARGET); // Return the generated code. return GetCode(NORMAL, name); } Object* LoadStubCompiler::CompileLoadField(JSObject* object, JSObject* holder, int index, String* name) { // ----------- S t a t e ------------- // -- r2 : name // -- lr : return address // -- [sp] : receiver // ----------------------------------- Label miss; __ ldr(r0, MemOperand(sp, 0)); GenerateLoadField(object, holder, r0, r3, r1, index, name, &miss); __ bind(&miss); GenerateLoadMiss(masm(), Code::LOAD_IC); // Return the generated code. return GetCode(FIELD, name); } Object* LoadStubCompiler::CompileLoadCallback(String* name, JSObject* object, JSObject* holder, AccessorInfo* callback) { // ----------- S t a t e ------------- // -- r2 : name // -- lr : return address // -- [sp] : receiver // ----------------------------------- Label miss; __ ldr(r0, MemOperand(sp, 0)); Failure* failure = Failure::InternalError(); bool success = GenerateLoadCallback(object, holder, r0, r2, r3, r1, callback, name, &miss, &failure); if (!success) return failure; __ bind(&miss); GenerateLoadMiss(masm(), Code::LOAD_IC); // Return the generated code. return GetCode(CALLBACKS, name); } Object* LoadStubCompiler::CompileLoadConstant(JSObject* object, JSObject* holder, Object* value, String* name) { // ----------- S t a t e ------------- // -- r2 : name // -- lr : return address // -- [sp] : receiver // ----------------------------------- Label miss; __ ldr(r0, MemOperand(sp, 0)); GenerateLoadConstant(object, holder, r0, r3, r1, value, name, &miss); __ bind(&miss); GenerateLoadMiss(masm(), Code::LOAD_IC); // Return the generated code. return GetCode(CONSTANT_FUNCTION, name); } Object* LoadStubCompiler::CompileLoadInterceptor(JSObject* object, JSObject* holder, String* name) { // ----------- S t a t e ------------- // -- r2 : name // -- lr : return address // -- [sp] : receiver // ----------------------------------- Label miss; __ ldr(r0, MemOperand(sp, 0)); LookupResult lookup; LookupPostInterceptor(holder, name, &lookup); GenerateLoadInterceptor(object, holder, &lookup, r0, r2, r3, r1, name, &miss); __ bind(&miss); GenerateLoadMiss(masm(), Code::LOAD_IC); // Return the generated code. return GetCode(INTERCEPTOR, name); } Object* LoadStubCompiler::CompileLoadGlobal(JSObject* object, GlobalObject* holder, JSGlobalPropertyCell* cell, String* name, bool is_dont_delete) { // ----------- S t a t e ------------- // -- r2 : name // -- lr : return address // -- [sp] : receiver // ----------------------------------- Label miss; // Get the receiver from the stack. __ ldr(r1, MemOperand(sp, 0 * kPointerSize)); // If the object is the holder then we know that it's a global // object which can only happen for contextual calls. In this case, // the receiver cannot be a smi. if (object != holder) { __ tst(r1, Operand(kSmiTagMask)); __ b(eq, &miss); } // Check that the map of the global has not changed. CheckPrototypes(object, r1, holder, r3, r0, name, &miss); // Get the value from the cell. __ mov(r3, Operand(Handle(cell))); __ ldr(r0, FieldMemOperand(r3, JSGlobalPropertyCell::kValueOffset)); // Check for deleted property if property can actually be deleted. if (!is_dont_delete) { __ LoadRoot(ip, Heap::kTheHoleValueRootIndex); __ cmp(r0, ip); __ b(eq, &miss); } __ IncrementCounter(&Counters::named_load_global_inline, 1, r1, r3); __ Ret(); __ bind(&miss); __ IncrementCounter(&Counters::named_load_global_inline_miss, 1, r1, r3); GenerateLoadMiss(masm(), Code::LOAD_IC); // Return the generated code. return GetCode(NORMAL, name); } Object* KeyedLoadStubCompiler::CompileLoadField(String* name, JSObject* receiver, JSObject* holder, int index) { // ----------- S t a t e ------------- // -- lr : return address // -- sp[0] : key // -- sp[4] : receiver // ----------------------------------- Label miss; __ ldr(r2, MemOperand(sp, 0)); __ ldr(r0, MemOperand(sp, kPointerSize)); __ cmp(r2, Operand(Handle(name))); __ b(ne, &miss); GenerateLoadField(receiver, holder, r0, r3, r1, index, name, &miss); __ bind(&miss); GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC); return GetCode(FIELD, name); } Object* KeyedLoadStubCompiler::CompileLoadCallback(String* name, JSObject* receiver, JSObject* holder, AccessorInfo* callback) { // ----------- S t a t e ------------- // -- lr : return address // -- sp[0] : key // -- sp[4] : receiver // ----------------------------------- Label miss; __ ldr(r2, MemOperand(sp, 0)); __ ldr(r0, MemOperand(sp, kPointerSize)); __ cmp(r2, Operand(Handle(name))); __ b(ne, &miss); Failure* failure = Failure::InternalError(); bool success = GenerateLoadCallback(receiver, holder, r0, r2, r3, r1, callback, name, &miss, &failure); if (!success) return failure; __ bind(&miss); GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC); return GetCode(CALLBACKS, name); } Object* KeyedLoadStubCompiler::CompileLoadConstant(String* name, JSObject* receiver, JSObject* holder, Object* value) { // ----------- S t a t e ------------- // -- lr : return address // -- sp[0] : key // -- sp[4] : receiver // ----------------------------------- Label miss; // Check the key is the cached one __ ldr(r2, MemOperand(sp, 0)); __ ldr(r0, MemOperand(sp, kPointerSize)); __ cmp(r2, Operand(Handle(name))); __ b(ne, &miss); GenerateLoadConstant(receiver, holder, r0, r3, r1, value, name, &miss); __ bind(&miss); GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC); // Return the generated code. return GetCode(CONSTANT_FUNCTION, name); } Object* KeyedLoadStubCompiler::CompileLoadInterceptor(JSObject* receiver, JSObject* holder, String* name) { // ----------- S t a t e ------------- // -- lr : return address // -- sp[0] : key // -- sp[4] : receiver // ----------------------------------- Label miss; // Check the key is the cached one __ ldr(r2, MemOperand(sp, 0)); __ ldr(r0, MemOperand(sp, kPointerSize)); __ cmp(r2, Operand(Handle(name))); __ b(ne, &miss); LookupResult lookup; LookupPostInterceptor(holder, name, &lookup); GenerateLoadInterceptor(receiver, holder, &lookup, r0, r2, r3, r1, name, &miss); __ bind(&miss); GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC); return GetCode(INTERCEPTOR, name); } Object* KeyedLoadStubCompiler::CompileLoadArrayLength(String* name) { // ----------- S t a t e ------------- // -- lr : return address // -- sp[0] : key // -- sp[4] : receiver // ----------------------------------- Label miss; // Check the key is the cached one __ ldr(r2, MemOperand(sp, 0)); __ ldr(r0, MemOperand(sp, kPointerSize)); __ cmp(r2, Operand(Handle(name))); __ b(ne, &miss); GenerateLoadArrayLength(masm(), r0, r3, &miss); __ bind(&miss); GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC); return GetCode(CALLBACKS, name); } Object* KeyedLoadStubCompiler::CompileLoadStringLength(String* name) { // ----------- S t a t e ------------- // -- lr : return address // -- sp[0] : key // -- sp[4] : receiver // ----------------------------------- Label miss; __ IncrementCounter(&Counters::keyed_load_string_length, 1, r1, r3); __ ldr(r2, MemOperand(sp)); __ ldr(r0, MemOperand(sp, kPointerSize)); // receiver __ cmp(r2, Operand(Handle(name))); __ b(ne, &miss); GenerateLoadStringLength(masm(), r0, r1, r3, &miss); __ bind(&miss); __ DecrementCounter(&Counters::keyed_load_string_length, 1, r1, r3); GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC); return GetCode(CALLBACKS, name); } // TODO(1224671): implement the fast case. Object* KeyedLoadStubCompiler::CompileLoadFunctionPrototype(String* name) { // ----------- S t a t e ------------- // -- lr : return address // -- sp[0] : key // -- sp[4] : receiver // ----------------------------------- GenerateLoadMiss(masm(), Code::KEYED_LOAD_IC); return GetCode(CALLBACKS, name); } Object* KeyedStoreStubCompiler::CompileStoreField(JSObject* object, int index, Map* transition, String* name) { // ----------- S t a t e ------------- // -- r0 : value // -- r2 : name // -- lr : return address // -- [sp] : receiver // ----------------------------------- Label miss; __ IncrementCounter(&Counters::keyed_store_field, 1, r1, r3); // Check that the name has not changed. __ cmp(r2, Operand(Handle(name))); __ b(ne, &miss); // Load receiver from the stack. __ ldr(r3, MemOperand(sp)); // r1 is used as scratch register, r3 and r2 might be clobbered. GenerateStoreField(masm(), object, index, transition, r3, r2, r1, &miss); __ bind(&miss); __ DecrementCounter(&Counters::keyed_store_field, 1, r1, r3); __ mov(r2, Operand(Handle(name))); // restore name register. Handle ic(Builtins::builtin(Builtins::KeyedStoreIC_Miss)); __ Jump(ic, RelocInfo::CODE_TARGET); // Return the generated code. return GetCode(transition == NULL ? FIELD : MAP_TRANSITION, name); } Object* ConstructStubCompiler::CompileConstructStub( SharedFunctionInfo* shared) { // ----------- S t a t e ------------- // -- r0 : argc // -- r1 : constructor // -- lr : return address // -- [sp] : last argument // ----------------------------------- Label generic_stub_call; // Use r7 for holding undefined which is used in several places below. __ LoadRoot(r7, Heap::kUndefinedValueRootIndex); #ifdef ENABLE_DEBUGGER_SUPPORT // Check to see whether there are any break points in the function code. If // there are jump to the generic constructor stub which calls the actual // code for the function thereby hitting the break points. __ ldr(r2, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset)); __ ldr(r2, FieldMemOperand(r2, SharedFunctionInfo::kDebugInfoOffset)); __ cmp(r2, r7); __ b(ne, &generic_stub_call); #endif // Load the initial map and verify that it is in fact a map. // r1: constructor function // r7: undefined __ ldr(r2, FieldMemOperand(r1, JSFunction::kPrototypeOrInitialMapOffset)); __ tst(r2, Operand(kSmiTagMask)); __ b(eq, &generic_stub_call); __ CompareObjectType(r2, r3, r4, MAP_TYPE); __ b(ne, &generic_stub_call); #ifdef DEBUG // Cannot construct functions this way. // r0: argc // r1: constructor function // r2: initial map // r7: undefined __ CompareInstanceType(r2, r3, JS_FUNCTION_TYPE); __ Check(ne, "Function constructed by construct stub."); #endif // Now allocate the JSObject in new space. // r0: argc // r1: constructor function // r2: initial map // r7: undefined __ ldrb(r3, FieldMemOperand(r2, Map::kInstanceSizeOffset)); __ AllocateInNewSpace(r3, r4, r5, r6, &generic_stub_call, NO_ALLOCATION_FLAGS); // Allocated the JSObject, now initialize the fields. Map is set to initial // map and properties and elements are set to empty fixed array. // r0: argc // r1: constructor function // r2: initial map // r3: object size (in words) // r4: JSObject (not tagged) // r7: undefined __ 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)); // Calculate the location of the first argument. The stack contains only the // argc arguments. __ add(r1, sp, Operand(r0, LSL, kPointerSizeLog2)); // Fill all the in-object properties with undefined. // r0: argc // r1: first argument // r3: object size (in words) // r4: JSObject (not tagged) // r5: First in-object property of JSObject (not tagged) // r7: undefined // Fill the initialized properties with a constant value or a passed argument // depending on the this.x = ...; assignment in the function. for (int i = 0; i < shared->this_property_assignments_count(); i++) { if (shared->IsThisPropertyAssignmentArgument(i)) { Label not_passed, next; // Check if the argument assigned to the property is actually passed. int arg_number = shared->GetThisPropertyAssignmentArgument(i); __ cmp(r0, Operand(arg_number)); __ b(le, ¬_passed); // Argument passed - find it on the stack. __ ldr(r2, MemOperand(r1, (arg_number + 1) * -kPointerSize)); __ str(r2, MemOperand(r5, kPointerSize, PostIndex)); __ b(&next); __ bind(¬_passed); // Set the property to undefined. __ str(r7, MemOperand(r5, kPointerSize, PostIndex)); __ bind(&next); } else { // Set the property to the constant value. Handle constant(shared->GetThisPropertyAssignmentConstant(i)); __ mov(r2, Operand(constant)); __ str(r2, MemOperand(r5, kPointerSize, PostIndex)); } } // Fill the unused in-object property fields with undefined. for (int i = shared->this_property_assignments_count(); i < shared->CalculateInObjectProperties(); i++) { __ str(r7, MemOperand(r5, kPointerSize, PostIndex)); } // r0: argc // r4: JSObject (not tagged) // Move argc to r1 and the JSObject to return to r0 and tag it. __ mov(r1, r0); __ mov(r0, r4); __ orr(r0, r0, Operand(kHeapObjectTag)); // r0: JSObject // r1: argc // Remove caller arguments and receiver from the stack and return. __ add(sp, sp, Operand(r1, LSL, kPointerSizeLog2)); __ add(sp, sp, Operand(kPointerSize)); __ IncrementCounter(&Counters::constructed_objects, 1, r1, r2); __ IncrementCounter(&Counters::constructed_objects_stub, 1, r1, r2); __ Jump(lr); // Jump to the generic stub in case the specialized code cannot handle the // construction. __ bind(&generic_stub_call); Code* code = Builtins::builtin(Builtins::JSConstructStubGeneric); Handle generic_construct_stub(code); __ Jump(generic_construct_stub, RelocInfo::CODE_TARGET); // Return the generated code. return GetCode(); } #undef __ } } // namespace v8::internal