1/* 2 * Copyright (C) 2012, 2013 Apple Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY 14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR 17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26#ifndef CallLinkStatus_h 27#define CallLinkStatus_h 28 29#include "CodeSpecializationKind.h" 30#include "Intrinsic.h" 31#include "JSCJSValue.h" 32 33namespace JSC { 34 35class CodeBlock; 36class ExecutableBase; 37class InternalFunction; 38class JSFunction; 39class Structure; 40 41class CallLinkStatus { 42public: 43 CallLinkStatus() 44 : m_executable(0) 45 , m_structure(0) 46 , m_couldTakeSlowPath(false) 47 , m_isProved(false) 48 { 49 } 50 51 static CallLinkStatus takesSlowPath() 52 { 53 CallLinkStatus result; 54 result.m_couldTakeSlowPath = true; 55 return result; 56 } 57 58 explicit CallLinkStatus(JSValue); 59 60 CallLinkStatus(ExecutableBase* executable, Structure* structure) 61 : m_executable(executable) 62 , m_structure(structure) 63 , m_couldTakeSlowPath(false) 64 , m_isProved(false) 65 { 66 ASSERT(!!executable == !!structure); 67 } 68 69 CallLinkStatus& setIsProved(bool isProved) 70 { 71 m_isProved = isProved; 72 return *this; 73 } 74 75 static CallLinkStatus computeFor(CodeBlock*, unsigned bytecodeIndex); 76 77 CallLinkStatus& setHasBadFunctionExitSite(bool didHaveExitSite) 78 { 79 ASSERT(!m_isProved); 80 if (didHaveExitSite) { 81 // Turn this into a closure call. 82 m_callTarget = JSValue(); 83 } 84 return *this; 85 } 86 87 CallLinkStatus& setHasBadCacheExitSite(bool didHaveExitSite) 88 { 89 ASSERT(!m_isProved); 90 if (didHaveExitSite) 91 *this = takesSlowPath(); 92 return *this; 93 } 94 95 CallLinkStatus& setHasBadExecutableExitSite(bool didHaveExitSite) 96 { 97 ASSERT(!m_isProved); 98 if (didHaveExitSite) 99 *this = takesSlowPath(); 100 return *this; 101 } 102 103 bool isSet() const { return m_callTarget || m_executable || m_couldTakeSlowPath; } 104 105 bool operator!() const { return !isSet(); } 106 107 bool couldTakeSlowPath() const { return m_couldTakeSlowPath; } 108 bool isClosureCall() const { return m_executable && !m_callTarget; } 109 110 JSValue callTarget() const { return m_callTarget; } 111 JSFunction* function() const; 112 InternalFunction* internalFunction() const; 113 Intrinsic intrinsicFor(CodeSpecializationKind) const; 114 ExecutableBase* executable() const { return m_executable; } 115 Structure* structure() const { return m_structure; } 116 bool isProved() const { return m_isProved; } 117 bool canOptimize() const { return (m_callTarget || m_executable) && !m_couldTakeSlowPath; } 118 119 void dump(PrintStream&) const; 120 121private: 122 static CallLinkStatus computeFromLLInt(CodeBlock*, unsigned bytecodeIndex); 123 124 JSValue m_callTarget; 125 ExecutableBase* m_executable; 126 Structure* m_structure; 127 bool m_couldTakeSlowPath; 128 bool m_isProved; 129}; 130 131} // namespace JSC 132 133#endif // CallLinkStatus_h 134 135