michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef jit_x86_Architecture_x86_h
michael@0: #define jit_x86_Architecture_x86_h
michael@0: 
michael@0: #include "assembler/assembler/MacroAssembler.h"
michael@0: 
michael@0: namespace js {
michael@0: namespace jit {
michael@0: 
michael@0: // In bytes: slots needed for potential memory->memory move spills.
michael@0: //   +8 for cycles
michael@0: //   +4 for gpr spills
michael@0: //   +8 for double spills
michael@0: static const uint32_t ION_FRAME_SLACK_SIZE    = 20;
michael@0: 
michael@0: // Only Win64 requires shadow stack space.
michael@0: static const uint32_t ShadowStackSpace = 0;
michael@0: 
michael@0: // These offsets are specific to nunboxing, and capture offsets into the
michael@0: // components of a js::Value.
michael@0: static const int32_t NUNBOX32_TYPE_OFFSET         = 4;
michael@0: static const int32_t NUNBOX32_PAYLOAD_OFFSET      = 0;
michael@0: 
michael@0: ////
michael@0: // These offsets are related to bailouts.
michael@0: ////
michael@0: 
michael@0: // Size of each bailout table entry. On x86 this is a 5-byte relative call.
michael@0: static const uint32_t BAILOUT_TABLE_ENTRY_SIZE    = 5;
michael@0: 
michael@0: class Registers {
michael@0:   public:
michael@0:     typedef JSC::X86Registers::RegisterID Code;
michael@0: 
michael@0:     static const char *GetName(Code code) {
michael@0:         static const char * const Names[] = { "eax", "ecx", "edx", "ebx",
michael@0:                                               "esp", "ebp", "esi", "edi" };
michael@0:         return Names[code];
michael@0:     }
michael@0: 
michael@0:     static Code FromName(const char *name) {
michael@0:         for (size_t i = 0; i < Total; i++) {
michael@0:             if (strcmp(GetName(Code(i)), name) == 0)
michael@0:                 return Code(i);
michael@0:         }
michael@0:         return Invalid;
michael@0:     }
michael@0: 
michael@0:     static const Code StackPointer = JSC::X86Registers::esp;
michael@0:     static const Code Invalid = JSC::X86Registers::invalid_reg;
michael@0: 
michael@0:     static const uint32_t Total = 8;
michael@0:     static const uint32_t Allocatable = 7;
michael@0: 
michael@0:     static const uint32_t AllMask = (1 << Total) - 1;
michael@0: 
michael@0:     static const uint32_t ArgRegMask = 0;
michael@0: 
michael@0:     static const uint32_t VolatileMask =
michael@0:         (1 << JSC::X86Registers::eax) |
michael@0:         (1 << JSC::X86Registers::ecx) |
michael@0:         (1 << JSC::X86Registers::edx);
michael@0: 
michael@0:     static const uint32_t NonVolatileMask =
michael@0:         (1 << JSC::X86Registers::ebx) |
michael@0:         (1 << JSC::X86Registers::esi) |
michael@0:         (1 << JSC::X86Registers::edi) |
michael@0:         (1 << JSC::X86Registers::ebp);
michael@0: 
michael@0:     static const uint32_t WrapperMask =
michael@0:         VolatileMask |
michael@0:         (1 << JSC::X86Registers::ebx);
michael@0: 
michael@0:     static const uint32_t SingleByteRegs =
michael@0:         (1 << JSC::X86Registers::eax) |
michael@0:         (1 << JSC::X86Registers::ecx) |
michael@0:         (1 << JSC::X86Registers::edx) |
michael@0:         (1 << JSC::X86Registers::ebx);
michael@0: 
michael@0:     static const uint32_t NonAllocatableMask =
michael@0:         (1 << JSC::X86Registers::esp);
michael@0: 
michael@0:     static const uint32_t AllocatableMask = AllMask & ~NonAllocatableMask;
michael@0: 
michael@0:     // Registers that can be allocated without being saved, generally.
michael@0:     static const uint32_t TempMask = VolatileMask & ~NonAllocatableMask;
michael@0: 
michael@0:     // Registers returned from a JS -> JS call.
michael@0:     static const uint32_t JSCallMask =
michael@0:         (1 << JSC::X86Registers::ecx) |
michael@0:         (1 << JSC::X86Registers::edx);
michael@0: 
michael@0:     // Registers returned from a JS -> C call.
michael@0:     static const uint32_t CallMask =
michael@0:         (1 << JSC::X86Registers::eax);
michael@0: };
michael@0: 
michael@0: // Smallest integer type that can hold a register bitmask.
michael@0: typedef uint8_t PackedRegisterMask;
michael@0: 
michael@0: class FloatRegisters {
michael@0:   public:
michael@0:     typedef JSC::X86Registers::XMMRegisterID Code;
michael@0: 
michael@0:     static const char *GetName(Code code) {
michael@0:         static const char * const Names[] = { "xmm0", "xmm1", "xmm2", "xmm3",
michael@0:                                               "xmm4", "xmm5", "xmm6", "xmm7" };
michael@0:         return Names[code];
michael@0:     }
michael@0: 
michael@0:     static Code FromName(const char *name) {
michael@0:         for (size_t i = 0; i < Total; i++) {
michael@0:             if (strcmp(GetName(Code(i)), name) == 0)
michael@0:                 return Code(i);
michael@0:         }
michael@0:         return Invalid;
michael@0:     }
michael@0: 
michael@0:     static const Code Invalid = JSC::X86Registers::invalid_xmm;
michael@0: 
michael@0:     static const uint32_t Total = 8;
michael@0:     static const uint32_t Allocatable = 7;
michael@0: 
michael@0:     static const uint32_t AllMask = (1 << Total) - 1;
michael@0: 
michael@0:     static const uint32_t VolatileMask = AllMask;
michael@0:     static const uint32_t NonVolatileMask = 0;
michael@0: 
michael@0:     static const uint32_t WrapperMask = VolatileMask;
michael@0: 
michael@0:     static const uint32_t NonAllocatableMask =
michael@0:         (1 << JSC::X86Registers::xmm7);
michael@0: 
michael@0:     static const uint32_t AllocatableMask = AllMask & ~NonAllocatableMask;
michael@0: };
michael@0: 
michael@0: } // namespace jit
michael@0: } // namespace js
michael@0: 
michael@0: #endif /* jit_x86_Architecture_x86_h */