1 /* 2 * Copyright (C) 2010 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. AND ITS CONTRIBUTORS ``AS IS'' 14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS 17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF 23 * THE POSSIBILITY OF SUCH DAMAGE. 24 */ 25 26 #include "config.h" 27 #include "ThunkGenerators.h" 28 29 #include "CodeBlock.h" 30 #include <wtf/text/StringImpl.h> 31 #include "SpecializedThunkJIT.h" 32 33 #if ENABLE(JIT) 34 35 namespace JSC { 36 stringCharLoad(SpecializedThunkJIT & jit)37 static void stringCharLoad(SpecializedThunkJIT& jit) 38 { 39 // load string 40 jit.loadJSStringArgument(SpecializedThunkJIT::ThisArgument, SpecializedThunkJIT::regT0); 41 // regT0 now contains this, and is a non-rope JSString* 42 43 // Load string length to regT2, and start the process of loading the data pointer into regT0 44 jit.load32(MacroAssembler::Address(SpecializedThunkJIT::regT0, ThunkHelpers::jsStringLengthOffset()), SpecializedThunkJIT::regT2); 45 jit.loadPtr(MacroAssembler::Address(SpecializedThunkJIT::regT0, ThunkHelpers::jsStringValueOffset()), SpecializedThunkJIT::regT0); 46 jit.loadPtr(MacroAssembler::Address(SpecializedThunkJIT::regT0, ThunkHelpers::stringImplDataOffset()), SpecializedThunkJIT::regT0); 47 48 // load index 49 jit.loadInt32Argument(0, SpecializedThunkJIT::regT1); // regT1 contains the index 50 51 // Do an unsigned compare to simultaneously filter negative indices as well as indices that are too large 52 jit.appendFailure(jit.branch32(MacroAssembler::AboveOrEqual, SpecializedThunkJIT::regT1, SpecializedThunkJIT::regT2)); 53 54 // Load the character 55 jit.load16(MacroAssembler::BaseIndex(SpecializedThunkJIT::regT0, SpecializedThunkJIT::regT1, MacroAssembler::TimesTwo, 0), SpecializedThunkJIT::regT0); 56 } 57 charToString(SpecializedThunkJIT & jit,JSGlobalData * globalData,MacroAssembler::RegisterID src,MacroAssembler::RegisterID dst,MacroAssembler::RegisterID scratch)58 static void charToString(SpecializedThunkJIT& jit, JSGlobalData* globalData, MacroAssembler::RegisterID src, MacroAssembler::RegisterID dst, MacroAssembler::RegisterID scratch) 59 { 60 jit.appendFailure(jit.branch32(MacroAssembler::AboveOrEqual, src, MacroAssembler::TrustedImm32(0x100))); 61 jit.move(MacroAssembler::TrustedImmPtr(globalData->smallStrings.singleCharacterStrings()), scratch); 62 jit.loadPtr(MacroAssembler::BaseIndex(scratch, src, MacroAssembler::ScalePtr, 0), dst); 63 jit.appendFailure(jit.branchTestPtr(MacroAssembler::Zero, dst)); 64 } 65 charCodeAtThunkGenerator(JSGlobalData * globalData,ExecutablePool * pool)66 MacroAssemblerCodePtr charCodeAtThunkGenerator(JSGlobalData* globalData, ExecutablePool* pool) 67 { 68 SpecializedThunkJIT jit(1, globalData, pool); 69 stringCharLoad(jit); 70 jit.returnInt32(SpecializedThunkJIT::regT0); 71 return jit.finalize(globalData->jitStubs->ctiNativeCall()); 72 } 73 charAtThunkGenerator(JSGlobalData * globalData,ExecutablePool * pool)74 MacroAssemblerCodePtr charAtThunkGenerator(JSGlobalData* globalData, ExecutablePool* pool) 75 { 76 SpecializedThunkJIT jit(1, globalData, pool); 77 stringCharLoad(jit); 78 charToString(jit, globalData, SpecializedThunkJIT::regT0, SpecializedThunkJIT::regT0, SpecializedThunkJIT::regT1); 79 jit.returnJSCell(SpecializedThunkJIT::regT0); 80 return jit.finalize(globalData->jitStubs->ctiNativeCall()); 81 } 82 fromCharCodeThunkGenerator(JSGlobalData * globalData,ExecutablePool * pool)83 MacroAssemblerCodePtr fromCharCodeThunkGenerator(JSGlobalData* globalData, ExecutablePool* pool) 84 { 85 SpecializedThunkJIT jit(1, globalData, pool); 86 // load char code 87 jit.loadInt32Argument(0, SpecializedThunkJIT::regT0); 88 charToString(jit, globalData, SpecializedThunkJIT::regT0, SpecializedThunkJIT::regT0, SpecializedThunkJIT::regT1); 89 jit.returnJSCell(SpecializedThunkJIT::regT0); 90 return jit.finalize(globalData->jitStubs->ctiNativeCall()); 91 } 92 sqrtThunkGenerator(JSGlobalData * globalData,ExecutablePool * pool)93 MacroAssemblerCodePtr sqrtThunkGenerator(JSGlobalData* globalData, ExecutablePool* pool) 94 { 95 SpecializedThunkJIT jit(1, globalData, pool); 96 if (!jit.supportsFloatingPointSqrt()) 97 return globalData->jitStubs->ctiNativeCall(); 98 99 jit.loadDoubleArgument(0, SpecializedThunkJIT::fpRegT0, SpecializedThunkJIT::regT0); 100 jit.sqrtDouble(SpecializedThunkJIT::fpRegT0, SpecializedThunkJIT::fpRegT0); 101 jit.returnDouble(SpecializedThunkJIT::fpRegT0); 102 return jit.finalize(globalData->jitStubs->ctiNativeCall()); 103 } 104 105 static const double oneConstant = 1.0; 106 static const double negativeHalfConstant = -0.5; 107 powThunkGenerator(JSGlobalData * globalData,ExecutablePool * pool)108 MacroAssemblerCodePtr powThunkGenerator(JSGlobalData* globalData, ExecutablePool* pool) 109 { 110 SpecializedThunkJIT jit(2, globalData, pool); 111 if (!jit.supportsFloatingPoint()) 112 return globalData->jitStubs->ctiNativeCall(); 113 114 jit.loadDouble(&oneConstant, SpecializedThunkJIT::fpRegT1); 115 jit.loadDoubleArgument(0, SpecializedThunkJIT::fpRegT0, SpecializedThunkJIT::regT0); 116 MacroAssembler::Jump nonIntExponent; 117 jit.loadInt32Argument(1, SpecializedThunkJIT::regT0, nonIntExponent); 118 jit.appendFailure(jit.branch32(MacroAssembler::LessThan, SpecializedThunkJIT::regT0, MacroAssembler::TrustedImm32(0))); 119 120 MacroAssembler::Jump exponentIsZero = jit.branchTest32(MacroAssembler::Zero, SpecializedThunkJIT::regT0); 121 MacroAssembler::Label startLoop(jit.label()); 122 123 MacroAssembler::Jump exponentIsEven = jit.branchTest32(MacroAssembler::Zero, SpecializedThunkJIT::regT0, MacroAssembler::TrustedImm32(1)); 124 jit.mulDouble(SpecializedThunkJIT::fpRegT0, SpecializedThunkJIT::fpRegT1); 125 exponentIsEven.link(&jit); 126 jit.mulDouble(SpecializedThunkJIT::fpRegT0, SpecializedThunkJIT::fpRegT0); 127 jit.rshift32(MacroAssembler::TrustedImm32(1), SpecializedThunkJIT::regT0); 128 jit.branchTest32(MacroAssembler::NonZero, SpecializedThunkJIT::regT0).linkTo(startLoop, &jit); 129 130 exponentIsZero.link(&jit); 131 132 { 133 SpecializedThunkJIT::JumpList doubleResult; 134 jit.branchConvertDoubleToInt32(SpecializedThunkJIT::fpRegT1, SpecializedThunkJIT::regT0, doubleResult, SpecializedThunkJIT::fpRegT0); 135 jit.returnInt32(SpecializedThunkJIT::regT0); 136 doubleResult.link(&jit); 137 jit.returnDouble(SpecializedThunkJIT::fpRegT1); 138 } 139 140 if (jit.supportsFloatingPointSqrt()) { 141 nonIntExponent.link(&jit); 142 jit.loadDouble(&negativeHalfConstant, SpecializedThunkJIT::fpRegT3); 143 jit.loadDoubleArgument(1, SpecializedThunkJIT::fpRegT2, SpecializedThunkJIT::regT0); 144 jit.appendFailure(jit.branchDouble(MacroAssembler::DoubleLessThanOrEqual, SpecializedThunkJIT::fpRegT0, SpecializedThunkJIT::fpRegT1)); 145 jit.appendFailure(jit.branchDouble(MacroAssembler::DoubleNotEqualOrUnordered, SpecializedThunkJIT::fpRegT2, SpecializedThunkJIT::fpRegT3)); 146 jit.sqrtDouble(SpecializedThunkJIT::fpRegT0, SpecializedThunkJIT::fpRegT0); 147 jit.divDouble(SpecializedThunkJIT::fpRegT0, SpecializedThunkJIT::fpRegT1); 148 149 SpecializedThunkJIT::JumpList doubleResult; 150 jit.branchConvertDoubleToInt32(SpecializedThunkJIT::fpRegT1, SpecializedThunkJIT::regT0, doubleResult, SpecializedThunkJIT::fpRegT0); 151 jit.returnInt32(SpecializedThunkJIT::regT0); 152 doubleResult.link(&jit); 153 jit.returnDouble(SpecializedThunkJIT::fpRegT1); 154 } else 155 jit.appendFailure(nonIntExponent); 156 157 return jit.finalize(globalData->jitStubs->ctiNativeCall()); 158 } 159 160 } 161 162 #endif // ENABLE(JIT) 163