Source/JavaScriptCore/bytecode/InlineCallFrame.cpp

/*
 * Copyright (C) 2012-2015 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,
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#include "config.h"
#include "InlineCallFrame.h"

#include "CallFrame.h"
#include "CodeBlock.h"
#include "Executable.h"
#include "JSCInlines.h"

namespace JSC {

JSFunction* InlineCallFrame::calleeConstant() const
{
    if (calleeRecovery.isConstant())
        return jsCast<JSFunction*>(calleeRecovery.constant());
    return nullptr;
}

void InlineCallFrame::visitAggregate(SlotVisitor& visitor)
{
    // FIXME: This is an antipattern for two reasons. References introduced by the DFG
    // that aren't in the original CodeBlock being compiled should be weakly referenced.
    // Inline call frames aren't in the original CodeBlock, so they qualify as weak. Also,
    // those weak references should already be tracked in the DFG as weak FrozenValues. So,
    // there is probably no need for this. We already have assertions that this should be
    // unnecessary. Finally, just marking the executable and not anything else in the inline
    // call frame is almost certainly insufficient for what this method thought it was going
    // to accomplish.
    // https://bugs.webkit.org/show_bug.cgi?id=146613
    visitor.append(&executable);
}

JSFunction* InlineCallFrame::calleeForCallFrame(ExecState* exec) const
{
    return jsCast<JSFunction*>(calleeRecovery.recover(exec));
}

CodeBlockHash InlineCallFrame::hash() const
{
    return jsCast<FunctionExecutable*>(executable.get())->codeBlockFor(
        specializationKind())->hash();
}

CString InlineCallFrame::hashAsStringIfPossible() const
{
    return jsCast<FunctionExecutable*>(executable.get())->codeBlockFor(
        specializationKind())->hashAsStringIfPossible();
}

CString InlineCallFrame::inferredName() const
{
    return jsCast<FunctionExecutable*>(executable.get())->inferredName().utf8();
}

CodeBlock* InlineCallFrame::baselineCodeBlock() const
{
    return jsCast<FunctionExecutable*>(executable.get())->baselineCodeBlockFor(specializationKind());
}

void InlineCallFrame::dumpBriefFunctionInformation(PrintStream& out) const
{
    out.print(inferredName(), "#", hashAsStringIfPossible());
}

void InlineCallFrame::dumpInContext(PrintStream& out, DumpContext* context) const
{
    out.print(briefFunctionInformation(), ":<", RawPointer(executable.get()));
    if (executable->isStrictMode())
        out.print(" (StrictMode)");
    out.print(", bc#", caller.bytecodeIndex, ", ", kind);
    if (isClosureCall)
        out.print(", closure call");
    else
        out.print(", known callee: ", inContext(calleeRecovery.constant(), context));
    out.print(", numArgs+this = ", arguments.size());
    out.print(", stackOffset = ", stackOffset);
    out.print(" (", virtualRegisterForLocal(0), " maps to ", virtualRegisterForLocal(0) + stackOffset, ")>");
}

void InlineCallFrame::dump(PrintStream& out) const
{
    dumpInContext(out, 0);
}

} // namespace JSC

namespace WTF {

void printInternal(PrintStream& out, JSC::InlineCallFrame::Kind kind)
{
    switch (kind) {
    case JSC::InlineCallFrame::Call:
        out.print("Call");
        return;
    case JSC::InlineCallFrame::Construct:
        out.print("Construct");
        return;
    case JSC::InlineCallFrame::CallVarargs:
        out.print("CallVarargs");
        return;
    case JSC::InlineCallFrame::ConstructVarargs:
        out.print("ConstructVarargs");
        return;
    case JSC::InlineCallFrame::GetterCall:
        out.print("GetterCall");
        return;
    case JSC::InlineCallFrame::SetterCall:
        out.print("SetterCall");
        return;
    }
    RELEASE_ASSERT_NOT_REACHED();
}

} // namespace WTF