dfg/DFGGPRInfo.h

   1 /*
   2  * Copyright (C) 2011 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 DFGGPRInfo_h
  27 #define DFGGPRInfo_h
  28
  29 #if ENABLE(DFG_JIT)
  30
  31 #include <assembler/MacroAssembler.h>
  32 #include <dfg/DFGRegisterBank.h>
  33
  34 namespace JSC { namespace DFG {
  35
  36 typedef MacroAssembler::RegisterID GPRReg;
  37 #define InvalidGPRReg ((GPRReg)-1)
  38
  39 class GPRInfo {
  40 public:
  41     typedef GPRReg RegisterType;
  42     static const unsigned numberOfRegisters = 9;
  43
  44     // These registers match the old JIT.
  45     static const GPRReg timeoutCheckRegister = X86Registers::r12;
  46     static const GPRReg callFrameRegister = X86Registers::r13;
  47     static const GPRReg tagTypeNumberRegister = X86Registers::r14;
  48     static const GPRReg tagMaskRegister = X86Registers::r15;
  49     // Temporary registers.
  50     static const GPRReg regT0 = X86Registers::eax;
  51     static const GPRReg regT1 = X86Registers::edx;
  52     static const GPRReg regT2 = X86Registers::ecx;
  53     static const GPRReg regT3 = X86Registers::ebx;
  54     static const GPRReg regT4 = X86Registers::edi;
  55     static const GPRReg regT5 = X86Registers::esi;
  56     static const GPRReg regT6 = X86Registers::r8;
  57     static const GPRReg regT7 = X86Registers::r9;
  58     static const GPRReg regT8 = X86Registers::r10;
  59     // These constants provide the names for the general purpose argument & return value registers.
  60     static const GPRReg argumentGPR0 = X86Registers::edi; // regT4
  61     static const GPRReg argumentGPR1 = X86Registers::esi; // regT5
  62     static const GPRReg argumentGPR2 = X86Registers::edx; // regT1
  63     static const GPRReg argumentGPR3 = X86Registers::ecx; // regT2
  64     static const GPRReg returnValueGPR = X86Registers::eax; // regT0
  65     static const GPRReg returnValueGPR2 = X86Registers::edx; // regT1
  66
  67     static GPRReg toRegister(unsigned index)
  68     {
  69         ASSERT(index < numberOfRegisters);
  70         static const GPRReg registerForIndex[numberOfRegisters] = { regT0, regT1, regT2, regT3, regT4, regT5, regT6, regT7, regT8 };
  71         return registerForIndex[index];
  72     }
  73
  74     static unsigned toIndex(GPRReg reg)
  75     {
  76         ASSERT(reg != InvalidGPRReg);
  77         ASSERT(reg < 16);
  78         static const unsigned indexForRegister[16] = { 0, 2, 1, 3, InvalidIndex, InvalidIndex, 5, 4, 6, 7, 8, InvalidIndex, InvalidIndex, InvalidIndex, InvalidIndex, InvalidIndex };
  79         unsigned result = indexForRegister[reg];
  80         ASSERT(result != InvalidIndex);
  81         return result;
  82     }
  83
  84 #ifndef NDEBUG
  85     static const char* debugName(GPRReg reg)
  86     {
  87         ASSERT(reg != InvalidGPRReg);
  88         ASSERT(reg < 16);
  89         static const char* nameForRegister[16] = {
  90             "rax", "rcx", "rdx", "rbx",
  91             "rsp", "rbp", "rsi", "rdi",
  92             "r8", "r9", "r10", "r11",
  93             "r12", "r13", "r14", "r15"
  94         };
  95         return nameForRegister[reg];
  96     }
  97 #endif
  98 private:
  99
 100     static const unsigned InvalidIndex = 0xffffffff;
 101 };
 102
 103 typedef RegisterBank<GPRInfo>::iterator gpr_iterator;
 104
 105 } } // namespace JSC::DFG
 106
 107 #endif
 108 #endif