DFGStackLayoutPhase.cpp   [plain text]

/*
 * Copyright (C) 2013, 2015 Apple Inc. All rights reserved.
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 * 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
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#include "config.h"
#include "DFGStackLayoutPhase.h"

#if ENABLE(DFG_JIT)

#include "DFGGraph.h"
#include "DFGPhase.h"
#include "DFGValueSource.h"
#include "JSCInlines.h"

namespace JSC { namespace DFG {

class StackLayoutPhase : public Phase {
    static const bool verbose = false;
    
public:
    StackLayoutPhase(Graph& graph)
        : Phase(graph, "stack layout")
    {
    }
    
    bool run()
    {
        // This enumerates the locals that we actually care about and packs them. So for example
        // if we use local 1, 3, 4, 5, 7, then we remap them: 1->0, 3->1, 4->2, 5->3, 7->4. We
        // treat a variable as being "used" if there exists an access to it (SetLocal, GetLocal,
        // Flush, PhantomLocal).
        
        BitVector usedLocals;
        
        // Collect those variables that are used from IR.
        bool hasNodesThatNeedFixup = false;
        for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;) {
            BasicBlock* block = m_graph.block(blockIndex);
            if (!block)
                continue;
            for (unsigned nodeIndex = block->size(); nodeIndex--;) {
                Node* node = block->at(nodeIndex);
                switch (node->op()) {
                case GetLocal:
                case SetLocal:
                case Flush:
                case PhantomLocal: {
                    VariableAccessData* variable = node->variableAccessData();
                    if (variable->local().isArgument())
                        break;
                    usedLocals.set(variable->local().toLocal());
                    break;
                }
                    
                case GetLocalUnlinked: {
                    VirtualRegister operand = node->unlinkedLocal();
                    if (operand.isArgument())
                        break;
                    usedLocals.set(operand.toLocal());
                    hasNodesThatNeedFixup = true;
                    break;
                }
                    
                case LoadVarargs:
                case ForwardVarargs: {
                    LoadVarargsData* data = node->loadVarargsData();
                    if (data->count.isLocal())
                        usedLocals.set(data->count.toLocal());
                    if (data->start.isLocal()) {
                        // This part really relies on the contiguity of stack layout
                        // assignments.
                        ASSERT(VirtualRegister(data->start.offset() + data->limit - 1).isLocal());
                        for (unsigned i = data->limit; i--;) 
                            usedLocals.set(VirtualRegister(data->start.offset() + i).toLocal());
                    } // the else case shouldn't happen.
                    hasNodesThatNeedFixup = true;
                    break;
                }
                    
                case PutStack:
                case GetStack: {
                    StackAccessData* stack = node->stackAccessData();
                    if (stack->local.isArgument())
                        break;
                    usedLocals.set(stack->local.toLocal());
                    break;
                }
                    
                default:
                    break;
                }
            }
        }
        
        for (InlineCallFrameSet::iterator iter = m_graph.m_plan.inlineCallFrames->begin(); !!iter; ++iter) {
            InlineCallFrame* inlineCallFrame = *iter;
            
            if (inlineCallFrame->isVarargs()) {
                usedLocals.set(VirtualRegister(
                    JSStack::ArgumentCount + inlineCallFrame->stackOffset).toLocal());
            }
            
            for (unsigned argument = inlineCallFrame->arguments.size(); argument-- > 1;) {
                usedLocals.set(VirtualRegister(
                    virtualRegisterForArgument(argument).offset() +
                    inlineCallFrame->stackOffset).toLocal());
            }
        }
        
        Vector<unsigned> allocation(usedLocals.size());
        m_graph.m_nextMachineLocal = 0;
        for (unsigned i = 0; i < usedLocals.size(); ++i) {
            if (!usedLocals.get(i)) {
                allocation[i] = UINT_MAX;
                continue;
            }
            
            allocation[i] = m_graph.m_nextMachineLocal++;
        }
        
        for (unsigned i = m_graph.m_variableAccessData.size(); i--;) {
            VariableAccessData* variable = &m_graph.m_variableAccessData[i];
            if (!variable->isRoot())
                continue;
            
            if (variable->local().isArgument()) {
                variable->machineLocal() = variable->local();
                continue;
            }
            
            size_t local = variable->local().toLocal();
            if (local >= allocation.size())
                continue;
            
            if (allocation[local] == UINT_MAX)
                continue;
            
            variable->machineLocal() = assign(allocation, variable->local());
        }
        
        for (StackAccessData* data : m_graph.m_stackAccessData) {
            if (!data->local.isLocal()) {
                data->machineLocal = data->local;
                continue;
            }
            
            if (static_cast<size_t>(data->local.toLocal()) >= allocation.size())
                continue;
            if (allocation[data->local.toLocal()] == UINT_MAX)
                continue;
            
            data->machineLocal = assign(allocation, data->local);
        }
        
        // This register is never valid for DFG code blocks.
        codeBlock()->setActivationRegister(VirtualRegister());
        if (LIKELY(!m_graph.hasDebuggerEnabled()))
            codeBlock()->setScopeRegister(VirtualRegister());
        else
            codeBlock()->setScopeRegister(assign(allocation, codeBlock()->scopeRegister()));

        for (unsigned i = m_graph.m_inlineVariableData.size(); i--;) {
            InlineVariableData data = m_graph.m_inlineVariableData[i];
            InlineCallFrame* inlineCallFrame = data.inlineCallFrame;
            
            if (inlineCallFrame->isVarargs()) {
                inlineCallFrame->argumentCountRegister = assign(
                    allocation, VirtualRegister(inlineCallFrame->stackOffset + JSStack::ArgumentCount));
            }
            
            for (unsigned argument = inlineCallFrame->arguments.size(); argument-- > 1;) {
                ArgumentPosition& position = m_graph.m_argumentPositions[
                    data.argumentPositionStart + argument];
                VariableAccessData* variable = position.someVariable();
                ValueSource source;
                if (!variable)
                    source = ValueSource(SourceIsDead);
                else {
                    source = ValueSource::forFlushFormat(
                        variable->machineLocal(), variable->flushFormat());
                }
                inlineCallFrame->arguments[argument] = source.valueRecovery();
            }
            
            RELEASE_ASSERT(inlineCallFrame->isClosureCall == !!data.calleeVariable);
            if (inlineCallFrame->isClosureCall) {
                VariableAccessData* variable = data.calleeVariable->find();
                ValueSource source = ValueSource::forFlushFormat(
                    variable->machineLocal(),
                    variable->flushFormat());
                inlineCallFrame->calleeRecovery = source.valueRecovery();
            } else
                RELEASE_ASSERT(inlineCallFrame->calleeRecovery.isConstant());
        }
        
        // Fix GetLocalUnlinked's variable references.
        if (hasNodesThatNeedFixup) {
            for (BlockIndex blockIndex = m_graph.numBlocks(); blockIndex--;) {
                BasicBlock* block = m_graph.block(blockIndex);
                if (!block)
                    continue;
                for (unsigned nodeIndex = block->size(); nodeIndex--;) {
                    Node* node = block->at(nodeIndex);
                    switch (node->op()) {
                    case GetLocalUnlinked: {
                        node->setUnlinkedMachineLocal(assign(allocation, node->unlinkedLocal()));
                        break;
                    }
                        
                    case LoadVarargs:
                    case ForwardVarargs: {
                        LoadVarargsData* data = node->loadVarargsData();
                        data->machineCount = assign(allocation, data->count);
                        data->machineStart = assign(allocation, data->start);
                        break;
                    }
                        
                    default:
                        break;
                    }
                }
            }
        }
        
        return true;
    }

private:
    VirtualRegister assign(const Vector<unsigned>& allocation, VirtualRegister src)
    {
        VirtualRegister result = src;
        if (result.isLocal()) {
            unsigned myAllocation = allocation[result.toLocal()];
            if (myAllocation == UINT_MAX)
                result = VirtualRegister();
            else
                result = virtualRegisterForLocal(myAllocation);
        }
        return result;
    }
};

bool performStackLayout(Graph& graph)
{
    SamplingRegion samplingRegion("DFG Stack Layout Phase");
    return runPhase<StackLayoutPhase>(graph);
}

} } // namespace JSC::DFG

#endif // ENABLE(DFG_JIT)