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comparison: js/src/jit/x86/Architecture-x86.h
js/src/jit/x86/Architecture-x86.h
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| 1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- | |
| 2 * vim: set ts=8 sts=4 et sw=4 tw=99: | |
| 3 * This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #ifndef jit_x86_Architecture_x86_h | |
| 8 #define jit_x86_Architecture_x86_h | |
| 9 | |
| 10 #include "assembler/assembler/MacroAssembler.h" | |
| 11 | |
| 12 namespace js { | |
| 13 namespace jit { | |
| 14 | |
| 15 // In bytes: slots needed for potential memory->memory move spills. | |
| 16 // +8 for cycles | |
| 17 // +4 for gpr spills | |
| 18 // +8 for double spills | |
| 19 static const uint32_t ION_FRAME_SLACK_SIZE = 20; | |
| 20 | |
| 21 // Only Win64 requires shadow stack space. | |
| 22 static const uint32_t ShadowStackSpace = 0; | |
| 23 | |
| 24 // These offsets are specific to nunboxing, and capture offsets into the | |
| 25 // components of a js::Value. | |
| 26 static const int32_t NUNBOX32_TYPE_OFFSET = 4; | |
| 27 static const int32_t NUNBOX32_PAYLOAD_OFFSET = 0; | |
| 28 | |
| 29 //// | |
| 30 // These offsets are related to bailouts. | |
| 31 //// | |
| 32 | |
| 33 // Size of each bailout table entry. On x86 this is a 5-byte relative call. | |
| 34 static const uint32_t BAILOUT_TABLE_ENTRY_SIZE = 5; | |
| 35 | |
| 36 class Registers { | |
| 37 public: | |
| 38 typedef JSC::X86Registers::RegisterID Code; | |
| 39 | |
| 40 static const char *GetName(Code code) { | |
| 41 static const char * const Names[] = { "eax", "ecx", "edx", "ebx", | |
| 42 "esp", "ebp", "esi", "edi" }; | |
| 43 return Names[code]; | |
| 44 } | |
| 45 | |
| 46 static Code FromName(const char *name) { | |
| 47 for (size_t i = 0; i < Total; i++) { | |
| 48 if (strcmp(GetName(Code(i)), name) == 0) | |
| 49 return Code(i); | |
| 50 } | |
| 51 return Invalid; | |
| 52 } | |
| 53 | |
| 54 static const Code StackPointer = JSC::X86Registers::esp; | |
| 55 static const Code Invalid = JSC::X86Registers::invalid_reg; | |
| 56 | |
| 57 static const uint32_t Total = 8; | |
| 58 static const uint32_t Allocatable = 7; | |
| 59 | |
| 60 static const uint32_t AllMask = (1 << Total) - 1; | |
| 61 | |
| 62 static const uint32_t ArgRegMask = 0; | |
| 63 | |
| 64 static const uint32_t VolatileMask = | |
| 65 (1 << JSC::X86Registers::eax) | | |
| 66 (1 << JSC::X86Registers::ecx) | | |
| 67 (1 << JSC::X86Registers::edx); | |
| 68 | |
| 69 static const uint32_t NonVolatileMask = | |
| 70 (1 << JSC::X86Registers::ebx) | | |
| 71 (1 << JSC::X86Registers::esi) | | |
| 72 (1 << JSC::X86Registers::edi) | | |
| 73 (1 << JSC::X86Registers::ebp); | |
| 74 | |
| 75 static const uint32_t WrapperMask = | |
| 76 VolatileMask | | |
| 77 (1 << JSC::X86Registers::ebx); | |
| 78 | |
| 79 static const uint32_t SingleByteRegs = | |
| 80 (1 << JSC::X86Registers::eax) | | |
| 81 (1 << JSC::X86Registers::ecx) | | |
| 82 (1 << JSC::X86Registers::edx) | | |
| 83 (1 << JSC::X86Registers::ebx); | |
| 84 | |
| 85 static const uint32_t NonAllocatableMask = | |
| 86 (1 << JSC::X86Registers::esp); | |
| 87 | |
| 88 static const uint32_t AllocatableMask = AllMask & ~NonAllocatableMask; | |
| 89 | |
| 90 // Registers that can be allocated without being saved, generally. | |
| 91 static const uint32_t TempMask = VolatileMask & ~NonAllocatableMask; | |
| 92 | |
| 93 // Registers returned from a JS -> JS call. | |
| 94 static const uint32_t JSCallMask = | |
| 95 (1 << JSC::X86Registers::ecx) | | |
| 96 (1 << JSC::X86Registers::edx); | |
| 97 | |
| 98 // Registers returned from a JS -> C call. | |
| 99 static const uint32_t CallMask = | |
| 100 (1 << JSC::X86Registers::eax); | |
| 101 }; | |
| 102 | |
| 103 // Smallest integer type that can hold a register bitmask. | |
| 104 typedef uint8_t PackedRegisterMask; | |
| 105 | |
| 106 class FloatRegisters { | |
| 107 public: | |
| 108 typedef JSC::X86Registers::XMMRegisterID Code; | |
| 109 | |
| 110 static const char *GetName(Code code) { | |
| 111 static const char * const Names[] = { "xmm0", "xmm1", "xmm2", "xmm3", | |
| 112 "xmm4", "xmm5", "xmm6", "xmm7" }; | |
| 113 return Names[code]; | |
| 114 } | |
| 115 | |
| 116 static Code FromName(const char *name) { | |
| 117 for (size_t i = 0; i < Total; i++) { | |
| 118 if (strcmp(GetName(Code(i)), name) == 0) | |
| 119 return Code(i); | |
| 120 } | |
| 121 return Invalid; | |
| 122 } | |
| 123 | |
| 124 static const Code Invalid = JSC::X86Registers::invalid_xmm; | |
| 125 | |
| 126 static const uint32_t Total = 8; | |
| 127 static const uint32_t Allocatable = 7; | |
| 128 | |
| 129 static const uint32_t AllMask = (1 << Total) - 1; | |
| 130 | |
| 131 static const uint32_t VolatileMask = AllMask; | |
| 132 static const uint32_t NonVolatileMask = 0; | |
| 133 | |
| 134 static const uint32_t WrapperMask = VolatileMask; | |
| 135 | |
| 136 static const uint32_t NonAllocatableMask = | |
| 137 (1 << JSC::X86Registers::xmm7); | |
| 138 | |
| 139 static const uint32_t AllocatableMask = AllMask & ~NonAllocatableMask; | |
| 140 }; | |
| 141 | |
| 142 } // namespace jit | |
| 143 } // namespace js | |
| 144 | |
| 145 #endif /* jit_x86_Architecture_x86_h */ |
