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