| /* |
| * Copyright (C) 2014-2018 Apple Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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. |
| */ |
| |
| #pragma once |
| |
| #if ENABLE(DFG_JIT) |
| |
| #include "DFGClobberize.h" |
| |
| namespace JSC { namespace DFG { |
| |
| template<typename ReadFunctor, typename WriteFunctor, typename DefFunctor> |
| class PreciseLocalClobberizeAdaptor { |
| public: |
| PreciseLocalClobberizeAdaptor( |
| Graph& graph, Node* node, |
| const ReadFunctor& read, const WriteFunctor& write, const DefFunctor& def) |
| : m_graph(graph) |
| , m_node(node) |
| , m_read(read) |
| , m_unconditionalWrite(write) |
| , m_def(def) |
| { |
| } |
| |
| void read(AbstractHeap heap) |
| { |
| if (heap.kind() == Stack) { |
| if (heap.payload().isTop()) { |
| readTop(); |
| return; |
| } |
| |
| callIfAppropriate(m_read, VirtualRegister(heap.payload().value32())); |
| return; |
| } |
| |
| if (heap.overlaps(Stack)) { |
| readTop(); |
| return; |
| } |
| } |
| |
| void write(AbstractHeap heap) |
| { |
| // We expect stack writes to already be precisely characterized by DFG::clobberize(). |
| if (heap.kind() == Stack) { |
| RELEASE_ASSERT(!heap.payload().isTop()); |
| callIfAppropriate(m_unconditionalWrite, VirtualRegister(heap.payload().value32())); |
| return; |
| } |
| |
| RELEASE_ASSERT(!heap.overlaps(Stack)); |
| } |
| |
| void def(PureValue) |
| { |
| // PureValue defs never have anything to do with locals, so ignore this. |
| } |
| |
| void def(HeapLocation location, LazyNode node) |
| { |
| if (location.kind() != StackLoc) |
| return; |
| |
| RELEASE_ASSERT(location.heap().kind() == Stack); |
| |
| m_def(VirtualRegister(location.heap().payload().value32()), node); |
| } |
| |
| private: |
| template<typename Functor> |
| void callIfAppropriate(const Functor& functor, VirtualRegister operand) |
| { |
| if (operand.isLocal() && static_cast<unsigned>(operand.toLocal()) >= m_graph.block(0)->variablesAtHead.numberOfLocals()) |
| return; |
| |
| if (operand.isArgument() && !operand.isHeader() && static_cast<unsigned>(operand.toArgument()) >= m_graph.block(0)->variablesAtHead.numberOfArguments()) |
| return; |
| |
| functor(operand); |
| } |
| |
| void readTop() |
| { |
| auto readFrame = [&] (InlineCallFrame* inlineCallFrame, unsigned numberOfArgumentsToSkip) { |
| if (!inlineCallFrame) { |
| // Read the outermost arguments and argument count. |
| for (unsigned i = numberOfArgumentsToSkip; i < static_cast<unsigned>(m_graph.m_codeBlock->numParameters()); i++) |
| m_read(virtualRegisterForArgument(i)); |
| m_read(VirtualRegister(CallFrameSlot::argumentCount)); |
| return; |
| } |
| |
| for (unsigned i = numberOfArgumentsToSkip; i < inlineCallFrame->argumentsWithFixup.size(); i++) |
| m_read(VirtualRegister(inlineCallFrame->stackOffset + virtualRegisterForArgument(i).offset())); |
| if (inlineCallFrame->isVarargs()) |
| m_read(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::argumentCount)); |
| }; |
| |
| auto readSpread = [&] (Node* spread) { |
| ASSERT(spread->op() == Spread || spread->op() == PhantomSpread); |
| if (!spread->child1()->isPhantomAllocation()) |
| return; |
| |
| ASSERT(spread->child1()->op() == PhantomCreateRest || spread->child1()->op() == PhantomNewArrayBuffer); |
| if (spread->child1()->op() == PhantomNewArrayBuffer) { |
| // This reads from a constant buffer. |
| return; |
| } |
| InlineCallFrame* inlineCallFrame = spread->child1()->origin.semantic.inlineCallFrame; |
| unsigned numberOfArgumentsToSkip = spread->child1()->numberOfArgumentsToSkip(); |
| readFrame(inlineCallFrame, numberOfArgumentsToSkip); |
| }; |
| |
| auto readNewArrayWithSpreadNode = [&] (Node* arrayWithSpread) { |
| ASSERT(arrayWithSpread->op() == NewArrayWithSpread || arrayWithSpread->op() == PhantomNewArrayWithSpread); |
| BitVector* bitVector = arrayWithSpread->bitVector(); |
| for (unsigned i = 0; i < arrayWithSpread->numChildren(); i++) { |
| if (bitVector->get(i)) { |
| Node* child = m_graph.varArgChild(arrayWithSpread, i).node(); |
| if (child->op() == PhantomSpread) |
| readSpread(child); |
| } |
| } |
| }; |
| |
| switch (m_node->op()) { |
| case ForwardVarargs: |
| case CallForwardVarargs: |
| case ConstructForwardVarargs: |
| case TailCallForwardVarargs: |
| case TailCallForwardVarargsInlinedCaller: |
| case GetMyArgumentByVal: |
| case GetMyArgumentByValOutOfBounds: |
| case CreateDirectArguments: |
| case CreateScopedArguments: |
| case CreateClonedArguments: |
| case PhantomDirectArguments: |
| case PhantomClonedArguments: |
| case GetRestLength: |
| case CreateRest: { |
| bool isForwardingNode = false; |
| bool isPhantomNode = false; |
| switch (m_node->op()) { |
| case ForwardVarargs: |
| case CallForwardVarargs: |
| case ConstructForwardVarargs: |
| case TailCallForwardVarargs: |
| case TailCallForwardVarargsInlinedCaller: |
| isForwardingNode = true; |
| break; |
| case PhantomDirectArguments: |
| case PhantomClonedArguments: |
| isPhantomNode = true; |
| break; |
| default: |
| break; |
| } |
| |
| if (isPhantomNode && isFTL(m_graph.m_plan.mode)) |
| break; |
| |
| if (isForwardingNode && m_node->hasArgumentsChild() && m_node->argumentsChild() |
| && (m_node->argumentsChild()->op() == PhantomNewArrayWithSpread || m_node->argumentsChild()->op() == PhantomSpread)) { |
| if (m_node->argumentsChild()->op() == PhantomNewArrayWithSpread) |
| readNewArrayWithSpreadNode(m_node->argumentsChild().node()); |
| else |
| readSpread(m_node->argumentsChild().node()); |
| } else { |
| InlineCallFrame* inlineCallFrame; |
| if (m_node->hasArgumentsChild() && m_node->argumentsChild()) |
| inlineCallFrame = m_node->argumentsChild()->origin.semantic.inlineCallFrame; |
| else |
| inlineCallFrame = m_node->origin.semantic.inlineCallFrame; |
| |
| unsigned numberOfArgumentsToSkip = 0; |
| if (m_node->op() == GetMyArgumentByVal || m_node->op() == GetMyArgumentByValOutOfBounds) { |
| // The value of numberOfArgumentsToSkip guarantees that GetMyArgumentByVal* will never |
| // read any arguments below the number of arguments to skip. For example, if numberOfArgumentsToSkip is 2, |
| // we will never read argument 0 or argument 1. |
| numberOfArgumentsToSkip = m_node->numberOfArgumentsToSkip(); |
| } |
| |
| readFrame(inlineCallFrame, numberOfArgumentsToSkip); |
| } |
| |
| break; |
| } |
| |
| case Spread: |
| readSpread(m_node); |
| break; |
| |
| case NewArrayWithSpread: { |
| readNewArrayWithSpreadNode(m_node); |
| break; |
| } |
| |
| case GetArgument: { |
| InlineCallFrame* inlineCallFrame = m_node->origin.semantic.inlineCallFrame; |
| unsigned indexIncludingThis = m_node->argumentIndex(); |
| if (!inlineCallFrame) { |
| if (indexIncludingThis < static_cast<unsigned>(m_graph.m_codeBlock->numParameters())) |
| m_read(virtualRegisterForArgument(indexIncludingThis)); |
| m_read(VirtualRegister(CallFrameSlot::argumentCount)); |
| break; |
| } |
| |
| ASSERT_WITH_MESSAGE(inlineCallFrame->isVarargs(), "GetArgument is only used for InlineCallFrame if the call frame is varargs."); |
| if (indexIncludingThis < inlineCallFrame->argumentsWithFixup.size()) |
| m_read(VirtualRegister(inlineCallFrame->stackOffset + virtualRegisterForArgument(indexIncludingThis).offset())); |
| m_read(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::argumentCount)); |
| break; |
| } |
| |
| default: { |
| // All of the outermost arguments, except this, are read in sloppy mode. |
| if (!m_graph.m_codeBlock->isStrictMode()) { |
| for (unsigned i = m_graph.m_codeBlock->numParameters(); i--;) |
| m_read(virtualRegisterForArgument(i)); |
| } |
| |
| // The stack header is read. |
| for (unsigned i = 0; i < CallFrameSlot::thisArgument; ++i) |
| m_read(VirtualRegister(i)); |
| |
| // Read all of the inline arguments and call frame headers that we didn't already capture. |
| for (InlineCallFrame* inlineCallFrame = m_node->origin.semantic.inlineCallFrame; inlineCallFrame; inlineCallFrame = inlineCallFrame->getCallerInlineFrameSkippingTailCalls()) { |
| if (!inlineCallFrame->isStrictMode()) { |
| for (unsigned i = inlineCallFrame->argumentsWithFixup.size(); i--;) |
| m_read(VirtualRegister(inlineCallFrame->stackOffset + virtualRegisterForArgument(i).offset())); |
| } |
| if (inlineCallFrame->isClosureCall) |
| m_read(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::callee)); |
| if (inlineCallFrame->isVarargs()) |
| m_read(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::argumentCount)); |
| } |
| break; |
| } } |
| } |
| |
| Graph& m_graph; |
| Node* m_node; |
| const ReadFunctor& m_read; |
| const WriteFunctor& m_unconditionalWrite; |
| const DefFunctor& m_def; |
| }; |
| |
| template<typename ReadFunctor, typename WriteFunctor, typename DefFunctor> |
| void preciseLocalClobberize( |
| Graph& graph, Node* node, |
| const ReadFunctor& read, const WriteFunctor& write, const DefFunctor& def) |
| { |
| PreciseLocalClobberizeAdaptor<ReadFunctor, WriteFunctor, DefFunctor> |
| adaptor(graph, node, read, write, def); |
| clobberize(graph, node, adaptor); |
| } |
| |
| } } // namespace JSC::DFG |
| |
| #endif // ENABLE(DFG_JIT) |
