| // Copyright 2014 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/compiler/linkage.h" |
| |
| #include "src/assembler-inl.h" |
| #include "src/code-stubs.h" |
| #include "src/compilation-info.h" |
| #include "src/compiler/common-operator.h" |
| #include "src/compiler/frame.h" |
| #include "src/compiler/node.h" |
| #include "src/compiler/osr.h" |
| #include "src/compiler/pipeline.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace compiler { |
| |
| namespace { |
| |
| LinkageLocation regloc(Register reg, MachineType type) { |
| return LinkageLocation::ForRegister(reg.code(), type); |
| } |
| |
| } // namespace |
| |
| |
| std::ostream& operator<<(std::ostream& os, const CallDescriptor::Kind& k) { |
| switch (k) { |
| case CallDescriptor::kCallCodeObject: |
| os << "Code"; |
| break; |
| case CallDescriptor::kCallJSFunction: |
| os << "JS"; |
| break; |
| case CallDescriptor::kCallAddress: |
| os << "Addr"; |
| break; |
| case CallDescriptor::kCallWasmFunction: |
| os << "Wasm"; |
| break; |
| } |
| return os; |
| } |
| |
| |
| std::ostream& operator<<(std::ostream& os, const CallDescriptor& d) { |
| // TODO(svenpanne) Output properties etc. and be less cryptic. |
| return os << d.kind() << ":" << d.debug_name() << ":r" << d.ReturnCount() |
| << "s" << d.StackParameterCount() << "i" << d.InputCount() << "f" |
| << d.FrameStateCount(); |
| } |
| |
| MachineSignature* CallDescriptor::GetMachineSignature(Zone* zone) const { |
| size_t param_count = ParameterCount(); |
| size_t return_count = ReturnCount(); |
| MachineType* types = zone->NewArray<MachineType>(param_count + return_count); |
| int current = 0; |
| for (size_t i = 0; i < return_count; ++i) { |
| types[current++] = GetReturnType(i); |
| } |
| for (size_t i = 0; i < param_count; ++i) { |
| types[current++] = GetParameterType(i); |
| } |
| return new (zone) MachineSignature(return_count, param_count, types); |
| } |
| |
| bool CallDescriptor::HasSameReturnLocationsAs( |
| const CallDescriptor* other) const { |
| if (ReturnCount() != other->ReturnCount()) return false; |
| for (size_t i = 0; i < ReturnCount(); ++i) { |
| if (GetReturnLocation(i) != other->GetReturnLocation(i)) return false; |
| } |
| return true; |
| } |
| |
| int CallDescriptor::GetFirstUnusedStackSlot() const { |
| int slots_above_sp = 0; |
| for (size_t i = 0; i < InputCount(); ++i) { |
| LinkageLocation operand = GetInputLocation(i); |
| if (!operand.IsRegister()) { |
| int new_candidate = |
| -operand.GetLocation() + operand.GetSizeInPointers() - 1; |
| if (new_candidate > slots_above_sp) { |
| slots_above_sp = new_candidate; |
| } |
| } |
| } |
| return slots_above_sp; |
| } |
| |
| int CallDescriptor::GetStackParameterDelta( |
| CallDescriptor const* tail_caller) const { |
| int callee_slots_above_sp = GetFirstUnusedStackSlot(); |
| int tail_caller_slots_above_sp = tail_caller->GetFirstUnusedStackSlot(); |
| int stack_param_delta = callee_slots_above_sp - tail_caller_slots_above_sp; |
| if (kPadArguments) { |
| // Adjust stack delta when it is odd. |
| if (stack_param_delta % 2 != 0) { |
| if (callee_slots_above_sp % 2 != 0) { |
| // The delta is odd due to the callee - we will need to add one slot |
| // of padding. |
| ++stack_param_delta; |
| } else { |
| // The delta is odd because of the caller. We already have one slot of |
| // padding that we can reuse for arguments, so we will need one fewer |
| // slot. |
| --stack_param_delta; |
| } |
| } |
| } |
| return stack_param_delta; |
| } |
| |
| bool CallDescriptor::CanTailCall(const Node* node) const { |
| return HasSameReturnLocationsAs(CallDescriptorOf(node->op())); |
| } |
| |
| int CallDescriptor::CalculateFixedFrameSize() const { |
| switch (kind_) { |
| case kCallJSFunction: |
| return PushArgumentCount() |
| ? OptimizedBuiltinFrameConstants::kFixedSlotCount |
| : StandardFrameConstants::kFixedSlotCount; |
| break; |
| case kCallAddress: |
| return CommonFrameConstants::kFixedSlotCountAboveFp + |
| CommonFrameConstants::kCPSlotCount; |
| break; |
| case kCallCodeObject: |
| case kCallWasmFunction: |
| return TypedFrameConstants::kFixedSlotCount; |
| } |
| UNREACHABLE(); |
| } |
| |
| CallDescriptor* Linkage::ComputeIncoming(Zone* zone, CompilationInfo* info) { |
| DCHECK(!info->IsStub()); |
| if (!info->closure().is_null()) { |
| // If we are compiling a JS function, use a JS call descriptor, |
| // plus the receiver. |
| SharedFunctionInfo* shared = info->closure()->shared(); |
| return GetJSCallDescriptor(zone, info->is_osr(), |
| 1 + shared->internal_formal_parameter_count(), |
| CallDescriptor::kNoFlags); |
| } |
| return nullptr; // TODO(titzer): ? |
| } |
| |
| |
| // static |
| bool Linkage::NeedsFrameStateInput(Runtime::FunctionId function) { |
| switch (function) { |
| // Most runtime functions need a FrameState. A few chosen ones that we know |
| // not to call into arbitrary JavaScript, not to throw, and not to lazily |
| // deoptimize are whitelisted here and can be called without a FrameState. |
| case Runtime::kAbort: |
| case Runtime::kAllocateInTargetSpace: |
| case Runtime::kCreateIterResultObject: |
| case Runtime::kGeneratorGetContinuation: |
| case Runtime::kIncBlockCounter: |
| case Runtime::kIsFunction: |
| case Runtime::kNewClosure: |
| case Runtime::kNewClosure_Tenured: |
| case Runtime::kNewFunctionContext: |
| case Runtime::kPushBlockContext: |
| case Runtime::kPushCatchContext: |
| case Runtime::kReThrow: |
| case Runtime::kStringEqual: |
| case Runtime::kStringNotEqual: |
| case Runtime::kStringLessThan: |
| case Runtime::kStringLessThanOrEqual: |
| case Runtime::kStringGreaterThan: |
| case Runtime::kStringGreaterThanOrEqual: |
| case Runtime::kToFastProperties: // TODO(conradw): Is it safe? |
| case Runtime::kTraceEnter: |
| case Runtime::kTraceExit: |
| return false; |
| |
| // Some inline intrinsics are also safe to call without a FrameState. |
| case Runtime::kInlineClassOf: |
| case Runtime::kInlineCreateIterResultObject: |
| case Runtime::kInlineGeneratorClose: |
| case Runtime::kInlineGeneratorGetContext: |
| case Runtime::kInlineGeneratorGetInputOrDebugPos: |
| case Runtime::kInlineGeneratorGetResumeMode: |
| case Runtime::kInlineCreateJSGeneratorObject: |
| case Runtime::kInlineIsArray: |
| case Runtime::kInlineIsJSMap: |
| case Runtime::kInlineIsJSSet: |
| case Runtime::kInlineIsJSWeakMap: |
| case Runtime::kInlineIsJSWeakSet: |
| case Runtime::kInlineIsJSReceiver: |
| case Runtime::kInlineIsRegExp: |
| case Runtime::kInlineIsSmi: |
| case Runtime::kInlineIsTypedArray: |
| return false; |
| |
| default: |
| break; |
| } |
| |
| // For safety, default to needing a FrameState unless whitelisted. |
| return true; |
| } |
| |
| |
| bool CallDescriptor::UsesOnlyRegisters() const { |
| for (size_t i = 0; i < InputCount(); ++i) { |
| if (!GetInputLocation(i).IsRegister()) return false; |
| } |
| for (size_t i = 0; i < ReturnCount(); ++i) { |
| if (!GetReturnLocation(i).IsRegister()) return false; |
| } |
| return true; |
| } |
| |
| |
| CallDescriptor* Linkage::GetRuntimeCallDescriptor( |
| Zone* zone, Runtime::FunctionId function_id, int js_parameter_count, |
| Operator::Properties properties, CallDescriptor::Flags flags) { |
| const Runtime::Function* function = Runtime::FunctionForId(function_id); |
| const int return_count = function->result_size; |
| const char* debug_name = function->name; |
| |
| if (!Linkage::NeedsFrameStateInput(function_id)) { |
| flags = static_cast<CallDescriptor::Flags>( |
| flags & ~CallDescriptor::kNeedsFrameState); |
| } |
| |
| return GetCEntryStubCallDescriptor(zone, return_count, js_parameter_count, |
| debug_name, properties, flags); |
| } |
| |
| CallDescriptor* Linkage::GetCEntryStubCallDescriptor( |
| Zone* zone, int return_count, int js_parameter_count, |
| const char* debug_name, Operator::Properties properties, |
| CallDescriptor::Flags flags) { |
| const size_t function_count = 1; |
| const size_t num_args_count = 1; |
| const size_t context_count = 1; |
| const size_t parameter_count = function_count + |
| static_cast<size_t>(js_parameter_count) + |
| num_args_count + context_count; |
| |
| LocationSignature::Builder locations(zone, static_cast<size_t>(return_count), |
| static_cast<size_t>(parameter_count)); |
| |
| // Add returns. |
| if (locations.return_count_ > 0) { |
| locations.AddReturn(regloc(kReturnRegister0, MachineType::AnyTagged())); |
| } |
| if (locations.return_count_ > 1) { |
| locations.AddReturn(regloc(kReturnRegister1, MachineType::AnyTagged())); |
| } |
| if (locations.return_count_ > 2) { |
| locations.AddReturn(regloc(kReturnRegister2, MachineType::AnyTagged())); |
| } |
| |
| // All parameters to the runtime call go on the stack. |
| for (int i = 0; i < js_parameter_count; i++) { |
| locations.AddParam(LinkageLocation::ForCallerFrameSlot( |
| i - js_parameter_count, MachineType::AnyTagged())); |
| } |
| // Add runtime function itself. |
| locations.AddParam( |
| regloc(kRuntimeCallFunctionRegister, MachineType::Pointer())); |
| |
| // Add runtime call argument count. |
| locations.AddParam( |
| regloc(kRuntimeCallArgCountRegister, MachineType::Int32())); |
| |
| // Add context. |
| locations.AddParam(regloc(kContextRegister, MachineType::AnyTagged())); |
| |
| // The target for runtime calls is a code object. |
| MachineType target_type = MachineType::AnyTagged(); |
| LinkageLocation target_loc = |
| LinkageLocation::ForAnyRegister(MachineType::AnyTagged()); |
| return new (zone) CallDescriptor( // -- |
| CallDescriptor::kCallCodeObject, // kind |
| target_type, // target MachineType |
| target_loc, // target location |
| locations.Build(), // location_sig |
| js_parameter_count, // stack_parameter_count |
| properties, // properties |
| kNoCalleeSaved, // callee-saved |
| kNoCalleeSaved, // callee-saved fp |
| flags, // flags |
| debug_name); // debug name |
| } |
| |
| CallDescriptor* Linkage::GetJSCallDescriptor(Zone* zone, bool is_osr, |
| int js_parameter_count, |
| CallDescriptor::Flags flags) { |
| const size_t return_count = 1; |
| const size_t context_count = 1; |
| const size_t new_target_count = 1; |
| const size_t num_args_count = 1; |
| const size_t parameter_count = |
| js_parameter_count + new_target_count + num_args_count + context_count; |
| |
| LocationSignature::Builder locations(zone, return_count, parameter_count); |
| |
| // All JS calls have exactly one return value. |
| locations.AddReturn(regloc(kReturnRegister0, MachineType::AnyTagged())); |
| |
| // All parameters to JS calls go on the stack. |
| for (int i = 0; i < js_parameter_count; i++) { |
| int spill_slot_index = i - js_parameter_count; |
| locations.AddParam(LinkageLocation::ForCallerFrameSlot( |
| spill_slot_index, MachineType::AnyTagged())); |
| } |
| |
| // Add JavaScript call new target value. |
| locations.AddParam( |
| regloc(kJavaScriptCallNewTargetRegister, MachineType::AnyTagged())); |
| |
| // Add JavaScript call argument count. |
| locations.AddParam( |
| regloc(kJavaScriptCallArgCountRegister, MachineType::Int32())); |
| |
| // Add context. |
| locations.AddParam(regloc(kContextRegister, MachineType::AnyTagged())); |
| |
| // The target for JS function calls is the JSFunction object. |
| MachineType target_type = MachineType::AnyTagged(); |
| // When entering into an OSR function from unoptimized code the JSFunction |
| // is not in a register, but it is on the stack in the marker spill slot. |
| LinkageLocation target_loc = |
| is_osr ? LinkageLocation::ForSavedCallerFunction() |
| : regloc(kJSFunctionRegister, MachineType::AnyTagged()); |
| return new (zone) CallDescriptor( // -- |
| CallDescriptor::kCallJSFunction, // kind |
| target_type, // target MachineType |
| target_loc, // target location |
| locations.Build(), // location_sig |
| js_parameter_count, // stack_parameter_count |
| Operator::kNoProperties, // properties |
| kNoCalleeSaved, // callee-saved |
| kNoCalleeSaved, // callee-saved fp |
| CallDescriptor::kCanUseRoots | // flags |
| flags, // flags |
| "js-call"); |
| } |
| |
| // TODO(all): Add support for return representations/locations to |
| // CallInterfaceDescriptor. |
| // TODO(turbofan): cache call descriptors for code stub calls. |
| CallDescriptor* Linkage::GetStubCallDescriptor( |
| Isolate* isolate, Zone* zone, const CallInterfaceDescriptor& descriptor, |
| int stack_parameter_count, CallDescriptor::Flags flags, |
| Operator::Properties properties, MachineType return_type, |
| size_t return_count, Linkage::ContextSpecification context_spec) { |
| const int register_parameter_count = descriptor.GetRegisterParameterCount(); |
| const int js_parameter_count = |
| register_parameter_count + stack_parameter_count; |
| const int context_count = context_spec == kPassContext ? 1 : 0; |
| const size_t parameter_count = |
| static_cast<size_t>(js_parameter_count + context_count); |
| |
| LocationSignature::Builder locations(zone, return_count, parameter_count); |
| |
| // Add returns. |
| if (locations.return_count_ > 0) { |
| locations.AddReturn(regloc(kReturnRegister0, return_type)); |
| } |
| if (locations.return_count_ > 1) { |
| locations.AddReturn(regloc(kReturnRegister1, return_type)); |
| } |
| if (locations.return_count_ > 2) { |
| locations.AddReturn(regloc(kReturnRegister2, return_type)); |
| } |
| |
| // Add parameters in registers and on the stack. |
| for (int i = 0; i < js_parameter_count; i++) { |
| if (i < register_parameter_count) { |
| // The first parameters go in registers. |
| Register reg = descriptor.GetRegisterParameter(i); |
| MachineType type = descriptor.GetParameterType(i); |
| locations.AddParam(regloc(reg, type)); |
| } else { |
| // The rest of the parameters go on the stack. |
| int stack_slot = i - register_parameter_count - stack_parameter_count; |
| locations.AddParam(LinkageLocation::ForCallerFrameSlot( |
| stack_slot, MachineType::AnyTagged())); |
| } |
| } |
| // Add context. |
| if (context_count) { |
| locations.AddParam(regloc(kContextRegister, MachineType::AnyTagged())); |
| } |
| |
| // The target for stub calls is a code object. |
| MachineType target_type = MachineType::AnyTagged(); |
| LinkageLocation target_loc = |
| LinkageLocation::ForAnyRegister(MachineType::AnyTagged()); |
| return new (zone) CallDescriptor( // -- |
| CallDescriptor::kCallCodeObject, // kind |
| target_type, // target MachineType |
| target_loc, // target location |
| locations.Build(), // location_sig |
| stack_parameter_count, // stack_parameter_count |
| properties, // properties |
| kNoCalleeSaved, // callee-saved registers |
| kNoCalleeSaved, // callee-saved fp |
| CallDescriptor::kCanUseRoots | // flags |
| flags, // flags |
| descriptor.DebugName(isolate), descriptor.allocatable_registers()); |
| } |
| |
| // static |
| CallDescriptor* Linkage::GetAllocateCallDescriptor(Zone* zone) { |
| LocationSignature::Builder locations(zone, 1, 1); |
| |
| locations.AddParam(regloc(kAllocateSizeRegister, MachineType::Int32())); |
| |
| locations.AddReturn(regloc(kReturnRegister0, MachineType::AnyTagged())); |
| |
| // The target for allocate calls is a code object. |
| MachineType target_type = MachineType::AnyTagged(); |
| LinkageLocation target_loc = |
| LinkageLocation::ForAnyRegister(MachineType::AnyTagged()); |
| return new (zone) CallDescriptor( // -- |
| CallDescriptor::kCallCodeObject, // kind |
| target_type, // target MachineType |
| target_loc, // target location |
| locations.Build(), // location_sig |
| 0, // stack_parameter_count |
| Operator::kNoThrow, // properties |
| kNoCalleeSaved, // callee-saved registers |
| kNoCalleeSaved, // callee-saved fp |
| CallDescriptor::kCanUseRoots, // flags |
| "Allocate"); |
| } |
| |
| // static |
| CallDescriptor* Linkage::GetBytecodeDispatchCallDescriptor( |
| Isolate* isolate, Zone* zone, const CallInterfaceDescriptor& descriptor, |
| int stack_parameter_count) { |
| const int register_parameter_count = descriptor.GetRegisterParameterCount(); |
| const int parameter_count = register_parameter_count + stack_parameter_count; |
| |
| LocationSignature::Builder locations(zone, 0, parameter_count); |
| |
| // Add parameters in registers and on the stack. |
| for (int i = 0; i < parameter_count; i++) { |
| if (i < register_parameter_count) { |
| // The first parameters go in registers. |
| Register reg = descriptor.GetRegisterParameter(i); |
| MachineType type = descriptor.GetParameterType(i); |
| locations.AddParam(regloc(reg, type)); |
| } else { |
| // The rest of the parameters go on the stack. |
| int stack_slot = i - register_parameter_count - stack_parameter_count; |
| locations.AddParam(LinkageLocation::ForCallerFrameSlot( |
| stack_slot, MachineType::AnyTagged())); |
| } |
| } |
| |
| // The target for interpreter dispatches is a code entry address. |
| MachineType target_type = MachineType::Pointer(); |
| LinkageLocation target_loc = LinkageLocation::ForAnyRegister(target_type); |
| return new (zone) CallDescriptor( // -- |
| CallDescriptor::kCallAddress, // kind |
| target_type, // target MachineType |
| target_loc, // target location |
| locations.Build(), // location_sig |
| stack_parameter_count, // stack_parameter_count |
| Operator::kNoProperties, // properties |
| kNoCalleeSaved, // callee-saved registers |
| kNoCalleeSaved, // callee-saved fp |
| CallDescriptor::kCanUseRoots, // flags |
| descriptor.DebugName(isolate)); |
| } |
| |
| LinkageLocation Linkage::GetOsrValueLocation(int index) const { |
| CHECK(incoming_->IsJSFunctionCall()); |
| int parameter_count = static_cast<int>(incoming_->JSParameterCount() - 1); |
| int first_stack_slot = OsrHelper::FirstStackSlotIndex(parameter_count); |
| |
| if (index == kOsrContextSpillSlotIndex) { |
| // Context. Use the parameter location of the context spill slot. |
| // Parameter (arity + 2) is special for the context of the function frame. |
| // >> context_index = target + receiver + params + new_target + #args |
| int context_index = 1 + 1 + parameter_count + 1 + 1; |
| return incoming_->GetInputLocation(context_index); |
| } else if (index >= first_stack_slot) { |
| // Local variable stored in this (callee) stack. |
| int spill_index = |
| index - first_stack_slot + StandardFrameConstants::kFixedSlotCount; |
| return LinkageLocation::ForCalleeFrameSlot(spill_index, |
| MachineType::AnyTagged()); |
| } else { |
| // Parameter. Use the assigned location from the incoming call descriptor. |
| int parameter_index = 1 + index; // skip index 0, which is the target. |
| return incoming_->GetInputLocation(parameter_index); |
| } |
| } |
| |
| |
| bool Linkage::ParameterHasSecondaryLocation(int index) const { |
| if (!incoming_->IsJSFunctionCall()) return false; |
| LinkageLocation loc = GetParameterLocation(index); |
| return (loc == regloc(kJSFunctionRegister, MachineType::AnyTagged()) || |
| loc == regloc(kContextRegister, MachineType::AnyTagged())); |
| } |
| |
| LinkageLocation Linkage::GetParameterSecondaryLocation(int index) const { |
| DCHECK(ParameterHasSecondaryLocation(index)); |
| LinkageLocation loc = GetParameterLocation(index); |
| |
| if (loc == regloc(kJSFunctionRegister, MachineType::AnyTagged())) { |
| return LinkageLocation::ForCalleeFrameSlot(Frame::kJSFunctionSlot, |
| MachineType::AnyTagged()); |
| } else { |
| DCHECK(loc == regloc(kContextRegister, MachineType::AnyTagged())); |
| return LinkageLocation::ForCalleeFrameSlot(Frame::kContextSlot, |
| MachineType::AnyTagged()); |
| } |
| } |
| |
| |
| } // namespace compiler |
| } // namespace internal |
| } // namespace v8 |
