| /* |
| * Copyright (C) 2012 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. |
| */ |
| |
| #ifndef MethodOfGettingAValueProfile_h |
| #define MethodOfGettingAValueProfile_h |
| |
| #include <wtf/Platform.h> |
| |
| // This is guarded by ENABLE_DFG_JIT only because it uses some value profiles |
| // that are currently only used if the DFG is enabled (i.e. they are not |
| // available in the profile-only configuration). Hopefully someday all of |
| // these #if's will disappear... |
| #if ENABLE(DFG_JIT) |
| |
| #include "JSValue.h" |
| |
| namespace JSC { |
| |
| class CodeBlock; |
| class LazyOperandValueProfileKey; |
| struct ValueProfile; |
| |
| class MethodOfGettingAValueProfile { |
| public: |
| MethodOfGettingAValueProfile() |
| : m_kind(None) |
| { |
| } |
| |
| explicit MethodOfGettingAValueProfile(ValueProfile* profile) |
| { |
| if (profile) { |
| m_kind = Ready; |
| u.profile = profile; |
| } else |
| m_kind = None; |
| } |
| |
| static MethodOfGettingAValueProfile fromLazyOperand( |
| CodeBlock*, const LazyOperandValueProfileKey&); |
| |
| bool operator!() const { return m_kind == None; } |
| |
| // This logically has a pointer to a "There exists X such that |
| // ValueProfileBase<X>". But since C++ does not have existential |
| // templates, I cannot return it. So instead, for any methods that |
| // users of this class would like to call, we'll just have to provide |
| // a method here that does it through an indirection. Or we could |
| // possibly just make ValueProfile less template-based. But last I |
| // tried that, it felt more yucky than this class. |
| |
| EncodedJSValue* getSpecFailBucket(unsigned index) const; |
| |
| private: |
| enum Kind { |
| None, |
| Ready, |
| LazyOperand |
| }; |
| |
| Kind m_kind; |
| union { |
| ValueProfile* profile; |
| struct { |
| CodeBlock* codeBlock; |
| unsigned bytecodeOffset; |
| int operand; |
| } lazyOperand; |
| } u; |
| }; |
| |
| } // namespace JSC |
| |
| #endif // ENABLE(DFG_JIT) |
| |
| #endif // MethodOfGettingAValueProfile_h |
| |