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26 #ifndef JSInterfaceJIT_h
27 #define JSInterfaceJIT_h
32 #include "MacroAssembler.h"
33 #include "RegisterFile.h"
34 #include <wtf/AlwaysInline.h>
35 #include <wtf/Vector.h>
38 class JSInterfaceJIT : public MacroAssembler {
42 // regT0 has two special meanings. The return value from a stub
43 // call will always be in regT0, and by default (unless
44 // a register is specified) emitPutVirtualRegister() will store
45 // the value from regT0.
47 // regT3 is required to be callee-preserved.
49 // tempRegister2 is has no such dependencies. It is important that
50 // on x86/x86-64 it is ecx for performance reasons, since the
51 // MacroAssembler will need to plant register swaps if it is not -
52 // however the code will still function correctly.
54 static const RegisterID returnValueRegister = X86Registers::eax;
55 static const RegisterID cachedResultRegister = X86Registers::eax;
56 static const RegisterID firstArgumentRegister = X86Registers::edi;
58 #if ENABLE(VALUE_PROFILER)
59 static const RegisterID bucketCounterRegister = X86Registers::r10;
62 static const RegisterID timeoutCheckRegister = X86Registers::r12;
63 static const RegisterID callFrameRegister = X86Registers::r13;
64 static const RegisterID tagTypeNumberRegister = X86Registers::r14;
65 static const RegisterID tagMaskRegister = X86Registers::r15;
67 static const RegisterID regT0 = X86Registers::eax;
68 static const RegisterID regT1 = X86Registers::edx;
69 static const RegisterID regT2 = X86Registers::ecx;
70 static const RegisterID regT3 = X86Registers::ebx;
72 static const FPRegisterID fpRegT0 = X86Registers::xmm0;
73 static const FPRegisterID fpRegT1 = X86Registers::xmm1;
74 static const FPRegisterID fpRegT2 = X86Registers::xmm2;
75 static const FPRegisterID fpRegT3 = X86Registers::xmm3;
77 static const RegisterID returnValueRegister = X86Registers::eax;
78 static const RegisterID cachedResultRegister = X86Registers::eax;
79 // On x86 we always use fastcall conventions = but on
80 // OS X if might make more sense to just use regparm.
81 static const RegisterID firstArgumentRegister = X86Registers::ecx;
83 static const RegisterID timeoutCheckRegister = X86Registers::esi;
84 static const RegisterID callFrameRegister = X86Registers::edi;
86 static const RegisterID regT0 = X86Registers::eax;
87 static const RegisterID regT1 = X86Registers::edx;
88 static const RegisterID regT2 = X86Registers::ecx;
89 static const RegisterID regT3 = X86Registers::ebx;
91 static const FPRegisterID fpRegT0 = X86Registers::xmm0;
92 static const FPRegisterID fpRegT1 = X86Registers::xmm1;
93 static const FPRegisterID fpRegT2 = X86Registers::xmm2;
94 static const FPRegisterID fpRegT3 = X86Registers::xmm3;
96 static const RegisterID returnValueRegister = ARMRegisters::r0;
97 static const RegisterID cachedResultRegister = ARMRegisters::r0;
98 static const RegisterID firstArgumentRegister = ARMRegisters::r0;
100 static const RegisterID regT0 = ARMRegisters::r0;
101 static const RegisterID regT1 = ARMRegisters::r1;
102 static const RegisterID regT2 = ARMRegisters::r2;
103 static const RegisterID regT3 = ARMRegisters::r4;
105 static const RegisterID callFrameRegister = ARMRegisters::r5;
106 static const RegisterID timeoutCheckRegister = ARMRegisters::r6;
108 static const FPRegisterID fpRegT0 = ARMRegisters::d0;
109 static const FPRegisterID fpRegT1 = ARMRegisters::d1;
110 static const FPRegisterID fpRegT2 = ARMRegisters::d2;
111 static const FPRegisterID fpRegT3 = ARMRegisters::d3;
112 #elif CPU(ARM_TRADITIONAL)
113 static const RegisterID returnValueRegister = ARMRegisters::r0;
114 static const RegisterID cachedResultRegister = ARMRegisters::r0;
115 static const RegisterID firstArgumentRegister = ARMRegisters::r0;
117 static const RegisterID timeoutCheckRegister = ARMRegisters::r5;
118 static const RegisterID callFrameRegister = ARMRegisters::r4;
120 static const RegisterID regT0 = ARMRegisters::r0;
121 static const RegisterID regT1 = ARMRegisters::r1;
122 static const RegisterID regT2 = ARMRegisters::r2;
124 static const RegisterID regT3 = ARMRegisters::r7;
126 static const RegisterID regS0 = ARMRegisters::S0;
128 static const RegisterID regS1 = ARMRegisters::S1;
130 static const RegisterID regStackPtr = ARMRegisters::sp;
131 static const RegisterID regLink = ARMRegisters::lr;
133 static const FPRegisterID fpRegT0 = ARMRegisters::d0;
134 static const FPRegisterID fpRegT1 = ARMRegisters::d1;
135 static const FPRegisterID fpRegT2 = ARMRegisters::d2;
136 static const FPRegisterID fpRegT3 = ARMRegisters::d3;
138 static const RegisterID returnValueRegister = MIPSRegisters::v0;
139 static const RegisterID cachedResultRegister = MIPSRegisters::v0;
140 static const RegisterID firstArgumentRegister = MIPSRegisters::a0;
142 // regT0 must be v0 for returning a 32-bit value.
143 static const RegisterID regT0 = MIPSRegisters::v0;
145 // regT1 must be v1 for returning a pair of 32-bit value.
146 static const RegisterID regT1 = MIPSRegisters::v1;
148 static const RegisterID regT2 = MIPSRegisters::t4;
150 // regT3 must be saved in the callee, so use an S register.
151 static const RegisterID regT3 = MIPSRegisters::s2;
153 static const RegisterID callFrameRegister = MIPSRegisters::s0;
154 static const RegisterID timeoutCheckRegister = MIPSRegisters::s1;
156 static const FPRegisterID fpRegT0 = MIPSRegisters::f4;
157 static const FPRegisterID fpRegT1 = MIPSRegisters::f6;
158 static const FPRegisterID fpRegT2 = MIPSRegisters::f8;
159 static const FPRegisterID fpRegT3 = MIPSRegisters::f10;
161 static const RegisterID timeoutCheckRegister = SH4Registers::r8;
162 static const RegisterID callFrameRegister = SH4Registers::fp;
164 static const RegisterID regT0 = SH4Registers::r0;
165 static const RegisterID regT1 = SH4Registers::r1;
166 static const RegisterID regT2 = SH4Registers::r2;
167 static const RegisterID regT3 = SH4Registers::r10;
168 static const RegisterID regT4 = SH4Registers::r4;
169 static const RegisterID regT5 = SH4Registers::r5;
170 static const RegisterID regT6 = SH4Registers::r6;
171 static const RegisterID regT7 = SH4Registers::r7;
172 static const RegisterID firstArgumentRegister =regT4;
174 static const RegisterID returnValueRegister = SH4Registers::r0;
175 static const RegisterID cachedResultRegister = SH4Registers::r0;
177 static const FPRegisterID fpRegT0 = SH4Registers::fr0;
178 static const FPRegisterID fpRegT1 = SH4Registers::fr2;
179 static const FPRegisterID fpRegT2 = SH4Registers::fr4;
180 static const FPRegisterID fpRegT3 = SH4Registers::fr6;
181 static const FPRegisterID fpRegT4 = SH4Registers::fr8;
182 static const FPRegisterID fpRegT5 = SH4Registers::fr10;
183 static const FPRegisterID fpRegT6 = SH4Registers::fr12;
184 static const FPRegisterID fpRegT7 = SH4Registers::fr14;
186 #error "JIT not supported on this platform."
189 #if USE(JSVALUE32_64)
190 // Can't just propogate JSValue::Int32Tag as visual studio doesn't like it
191 static const unsigned Int32Tag = 0xffffffff;
192 COMPILE_ASSERT(Int32Tag == JSValue::Int32Tag, Int32Tag_out_of_sync);
194 static const unsigned Int32Tag = TagTypeNumber >> 32;
196 inline Jump emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID payload);
197 inline Jump emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst);
198 inline Jump emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch);
200 #if USE(JSVALUE32_64)
201 inline Jump emitJumpIfNotJSCell(unsigned virtualRegisterIndex);
202 inline Address tagFor(int index, RegisterID base = callFrameRegister);
206 Jump emitJumpIfImmediateNumber(RegisterID reg);
207 Jump emitJumpIfNotImmediateNumber(RegisterID reg);
208 void emitFastArithImmToInt(RegisterID reg);
211 inline Address payloadFor(int index, RegisterID base = callFrameRegister);
212 inline Address intPayloadFor(int index, RegisterID base = callFrameRegister);
213 inline Address intTagFor(int index, RegisterID base = callFrameRegister);
214 inline Address addressFor(int index, RegisterID base = callFrameRegister);
217 struct ThunkHelpers {
218 static unsigned stringImplDataOffset() { return StringImpl::dataOffset(); }
219 static unsigned jsStringLengthOffset() { return OBJECT_OFFSETOF(JSString, m_length); }
220 static unsigned jsStringValueOffset() { return OBJECT_OFFSETOF(JSString, m_value); }
223 #if USE(JSVALUE32_64)
224 inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID payload)
226 loadPtr(payloadFor(virtualRegisterIndex), payload);
227 return emitJumpIfNotJSCell(virtualRegisterIndex);
230 inline JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotJSCell(unsigned virtualRegisterIndex)
232 ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
233 return branch32(NotEqual, tagFor(virtualRegisterIndex), TrustedImm32(JSValue::CellTag));
236 inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst)
238 ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
239 loadPtr(payloadFor(virtualRegisterIndex), dst);
240 return branch32(NotEqual, tagFor(static_cast<int>(virtualRegisterIndex)), TrustedImm32(JSValue::Int32Tag));
243 inline JSInterfaceJIT::Address JSInterfaceJIT::tagFor(int virtualRegisterIndex, RegisterID base)
245 ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
246 return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)) + OBJECT_OFFSETOF(JSValue, u.asBits.tag));
249 inline JSInterfaceJIT::Address JSInterfaceJIT::payloadFor(int virtualRegisterIndex, RegisterID base)
251 ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
252 return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)) + OBJECT_OFFSETOF(JSValue, u.asBits.payload));
255 inline JSInterfaceJIT::Address JSInterfaceJIT::intPayloadFor(int virtualRegisterIndex, RegisterID base)
257 return payloadFor(virtualRegisterIndex, base);
260 inline JSInterfaceJIT::Address JSInterfaceJIT::intTagFor(int virtualRegisterIndex, RegisterID base)
262 return tagFor(virtualRegisterIndex, base);
265 inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch)
267 ASSERT(static_cast<int>(virtualRegisterIndex) < FirstConstantRegisterIndex);
268 loadPtr(tagFor(virtualRegisterIndex), scratch);
269 Jump isDouble = branch32(Below, scratch, TrustedImm32(JSValue::LowestTag));
270 Jump notInt = branch32(NotEqual, scratch, TrustedImm32(JSValue::Int32Tag));
271 loadPtr(payloadFor(virtualRegisterIndex), scratch);
272 convertInt32ToDouble(scratch, dst);
275 loadDouble(addressFor(virtualRegisterIndex), dst);
283 ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfImmediateNumber(RegisterID reg)
285 return branchTestPtr(NonZero, reg, tagTypeNumberRegister);
287 ALWAYS_INLINE JSInterfaceJIT::Jump JSInterfaceJIT::emitJumpIfNotImmediateNumber(RegisterID reg)
289 return branchTestPtr(Zero, reg, tagTypeNumberRegister);
291 inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadJSCell(unsigned virtualRegisterIndex, RegisterID dst)
293 loadPtr(addressFor(virtualRegisterIndex), dst);
294 return branchTestPtr(NonZero, dst, tagMaskRegister);
297 inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadInt32(unsigned virtualRegisterIndex, RegisterID dst)
299 loadPtr(addressFor(virtualRegisterIndex), dst);
300 Jump result = branchPtr(Below, dst, tagTypeNumberRegister);
301 zeroExtend32ToPtr(dst, dst);
305 inline JSInterfaceJIT::Jump JSInterfaceJIT::emitLoadDouble(unsigned virtualRegisterIndex, FPRegisterID dst, RegisterID scratch)
307 loadPtr(addressFor(virtualRegisterIndex), scratch);
308 Jump notNumber = emitJumpIfNotImmediateNumber(scratch);
309 Jump notInt = branchPtr(Below, scratch, tagTypeNumberRegister);
310 convertInt32ToDouble(scratch, dst);
313 addPtr(tagTypeNumberRegister, scratch);
314 movePtrToDouble(scratch, dst);
319 ALWAYS_INLINE void JSInterfaceJIT::emitFastArithImmToInt(RegisterID)
326 inline JSInterfaceJIT::Address JSInterfaceJIT::payloadFor(int virtualRegisterIndex, RegisterID base)
328 ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
329 return addressFor(virtualRegisterIndex, base);
332 inline JSInterfaceJIT::Address JSInterfaceJIT::intPayloadFor(int virtualRegisterIndex, RegisterID base)
334 ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
335 return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.payload));
337 inline JSInterfaceJIT::Address JSInterfaceJIT::intTagFor(int virtualRegisterIndex, RegisterID base)
339 ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
340 return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)) + OBJECT_OFFSETOF(EncodedValueDescriptor, asBits.tag));
344 inline JSInterfaceJIT::Address JSInterfaceJIT::addressFor(int virtualRegisterIndex, RegisterID base)
346 ASSERT(virtualRegisterIndex < FirstConstantRegisterIndex);
347 return Address(base, (static_cast<unsigned>(virtualRegisterIndex) * sizeof(Register)));
352 #endif // JSInterfaceJIT_h