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Diffstat (limited to 'js/src/wasm/WasmBCRegDefs.h')
| -rw-r--r-- | js/src/wasm/WasmBCRegDefs.h | 857 |
1 files changed, 857 insertions, 0 deletions
diff --git a/js/src/wasm/WasmBCRegDefs.h b/js/src/wasm/WasmBCRegDefs.h new file mode 100644 index 0000000000..733e12eaef --- /dev/null +++ b/js/src/wasm/WasmBCRegDefs.h @@ -0,0 +1,857 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- + * vim: set ts=8 sts=2 et sw=2 tw=80: + * + * Copyright 2016 Mozilla Foundation + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +// This is an INTERNAL header for Wasm baseline compiler: definitions of +// registers and the register allocator. + +#ifndef wasm_wasm_baseline_regdefs_h +#define wasm_wasm_baseline_regdefs_h + +#include "wasm/WasmBCDefs.h" + +namespace js { +namespace wasm { + +struct BaseCompiler; + +using namespace js::jit; + +////////////////////////////////////////////////////////////////////////////// +// +// Scratch register configuration. + +#if defined(JS_CODEGEN_NONE) || defined(JS_CODEGEN_WASM32) +# define RABALDR_SCRATCH_I32 +# define RABALDR_SCRATCH_F32 +# define RABALDR_SCRATCH_F64 + +static constexpr Register RabaldrScratchI32 = Register::Invalid(); +static constexpr FloatRegister RabaldrScratchF32 = InvalidFloatReg; +static constexpr FloatRegister RabaldrScratchF64 = InvalidFloatReg; +#endif + +#ifdef JS_CODEGEN_ARM64 +# define RABALDR_SCRATCH_I32 +# define RABALDR_SCRATCH_F32 +# define RABALDR_SCRATCH_F64 +# define RABALDR_SCRATCH_V128 +# define RABALDR_SCRATCH_F32_ALIASES_F64 + +static constexpr Register RabaldrScratchI32{Registers::x15}; + +// Note, the float scratch regs cannot be registers that are used for parameter +// passing in any ABI we use. Argregs tend to be low-numbered; register 30 +// should be safe. + +static constexpr FloatRegister RabaldrScratchF32{FloatRegisters::s30, + FloatRegisters::Single}; +static constexpr FloatRegister RabaldrScratchF64{FloatRegisters::d30, + FloatRegisters::Double}; +# ifdef ENABLE_WASM_SIMD +static constexpr FloatRegister RabaldrScratchV128{FloatRegisters::d30, + FloatRegisters::Simd128}; +# endif + +static_assert(RabaldrScratchF32 != ScratchFloat32Reg_, "Too busy"); +static_assert(RabaldrScratchF64 != ScratchDoubleReg_, "Too busy"); +# ifdef ENABLE_WASM_SIMD +static_assert(RabaldrScratchV128 != ScratchSimd128Reg, "Too busy"); +# endif +#endif + +#ifdef JS_CODEGEN_X86 +// The selection of EBX here steps gingerly around: the need for EDX +// to be allocatable for multiply/divide; ECX to be allocatable for +// shift/rotate; EAX (= ReturnReg) to be allocatable as the result +// register; EBX not being one of the WasmTableCall registers; and +// needing a temp register for load/store that has a single-byte +// persona. +// +// The compiler assumes that RabaldrScratchI32 has a single-byte +// persona. Code for 8-byte atomic operations assumes that +// RabaldrScratchI32 is in fact ebx. + +# define RABALDR_SCRATCH_I32 +static constexpr Register RabaldrScratchI32 = ebx; +#endif + +#ifdef JS_CODEGEN_ARM +// We use our own scratch register, because the macro assembler uses +// the regular scratch register(s) pretty liberally. We could +// work around that in several cases but the mess does not seem +// worth it yet. CallTempReg2 seems safe. + +# define RABALDR_SCRATCH_I32 +static constexpr Register RabaldrScratchI32 = CallTempReg2; +#endif + +#ifdef JS_CODEGEN_MIPS64 +# define RABALDR_SCRATCH_I32 +static constexpr Register RabaldrScratchI32 = CallTempReg2; +#endif + +#ifdef JS_CODEGEN_LOONG64 +// We use our own scratch register, because the macro assembler uses +// the regular scratch register(s) pretty liberally. We could +// work around that in several cases but the mess does not seem +// worth it yet. CallTempReg2 seems safe. + +# define RABALDR_SCRATCH_I32 +static constexpr Register RabaldrScratchI32 = CallTempReg2; +#endif + +#ifdef JS_CODEGEN_RISCV64 +# define RABALDR_SCRATCH_I32 +static constexpr Register RabaldrScratchI32 = CallTempReg2; +#endif + +#ifdef RABALDR_SCRATCH_F32_ALIASES_F64 +# if !defined(RABALDR_SCRATCH_F32) || !defined(RABALDR_SCRATCH_F64) +# error "Bad configuration" +# endif +#endif + +////////////////////////////////////////////////////////////////////////////// +// +// ... + +template <MIRType t> +struct RegTypeOf { +#ifdef ENABLE_WASM_SIMD + static_assert(t == MIRType::Float32 || t == MIRType::Double || + t == MIRType::Simd128, + "Float mask type"); +#else + static_assert(t == MIRType::Float32 || t == MIRType::Double, + "Float mask type"); +#endif +}; + +template <> +struct RegTypeOf<MIRType::Float32> { + static constexpr RegTypeName value = RegTypeName::Float32; +}; +template <> +struct RegTypeOf<MIRType::Double> { + static constexpr RegTypeName value = RegTypeName::Float64; +}; +#ifdef ENABLE_WASM_SIMD +template <> +struct RegTypeOf<MIRType::Simd128> { + static constexpr RegTypeName value = RegTypeName::Vector128; +}; +#endif + +////////////////////////////////////////////////////////////////////////////// +// +// Strongly typed register wrappers. + +// The strongly typed register wrappers are especially useful to distinguish +// float registers from double registers, but they also clearly distinguish +// 32-bit registers from 64-bit register pairs on 32-bit systems. + +struct RegI32 : public Register { + RegI32() : Register(Register::Invalid()) {} + explicit RegI32(Register reg) : Register(reg) { + MOZ_ASSERT(reg != Invalid()); + } + bool isInvalid() const { return *this == Invalid(); } + bool isValid() const { return !isInvalid(); } + static RegI32 Invalid() { return RegI32(); } +}; + +struct RegI64 : public Register64 { + RegI64() : Register64(Register64::Invalid()) {} + explicit RegI64(Register64 reg) : Register64(reg) { + MOZ_ASSERT(reg != Invalid()); + } + bool isInvalid() const { return *this == Invalid(); } + bool isValid() const { return !isInvalid(); } + static RegI64 Invalid() { return RegI64(); } +}; + +// RegRef is for GC-pointers, for non GC-pointers use RegPtr +struct RegRef : public Register { + RegRef() : Register(Register::Invalid()) {} + explicit RegRef(Register reg) : Register(reg) { + MOZ_ASSERT(reg != Invalid()); + } + bool isInvalid() const { return *this == Invalid(); } + bool isValid() const { return !isInvalid(); } + static RegRef Invalid() { return RegRef(); } +}; + +// RegPtr is for non GC-pointers, for GC-pointers use RegRef +struct RegPtr : public Register { + RegPtr() : Register(Register::Invalid()) {} + explicit RegPtr(Register reg) : Register(reg) { + MOZ_ASSERT(reg != Invalid()); + } + bool isInvalid() const { return *this == Invalid(); } + bool isValid() const { return !isInvalid(); } + static RegPtr Invalid() { return RegPtr(); } +}; + +struct RegF32 : public FloatRegister { + RegF32() {} + explicit RegF32(FloatRegister reg) : FloatRegister(reg) { + MOZ_ASSERT(isSingle()); + } + bool isValid() const { return !isInvalid(); } + static RegF32 Invalid() { return RegF32(); } +}; + +struct RegF64 : public FloatRegister { + RegF64() {} + explicit RegF64(FloatRegister reg) : FloatRegister(reg) { + MOZ_ASSERT(isDouble()); + } + bool isValid() const { return !isInvalid(); } + static RegF64 Invalid() { return RegF64(); } +}; + +#ifdef ENABLE_WASM_SIMD +struct RegV128 : public FloatRegister { + RegV128() {} + explicit RegV128(FloatRegister reg) : FloatRegister(reg) { + MOZ_ASSERT(isSimd128()); + } + bool isValid() const { return !isInvalid(); } + static RegV128 Invalid() { return RegV128(); } +}; +#endif + +struct AnyReg { + union { + RegI32 i32_; + RegI64 i64_; + RegRef ref_; + RegF32 f32_; + RegF64 f64_; +#ifdef ENABLE_WASM_SIMD + RegV128 v128_; +#endif + }; + + enum { + I32, + I64, + REF, + F32, + F64, +#ifdef ENABLE_WASM_SIMD + V128 +#endif + } tag; + + explicit AnyReg(RegI32 r) { + tag = I32; + i32_ = r; + } + explicit AnyReg(RegI64 r) { + tag = I64; + i64_ = r; + } + explicit AnyReg(RegF32 r) { + tag = F32; + f32_ = r; + } + explicit AnyReg(RegF64 r) { + tag = F64; + f64_ = r; + } +#ifdef ENABLE_WASM_SIMD + explicit AnyReg(RegV128 r) { + tag = V128; + v128_ = r; + } +#endif + explicit AnyReg(RegRef r) { + tag = REF; + ref_ = r; + } + + RegI32 i32() const { + MOZ_ASSERT(tag == I32); + return i32_; + } + RegI64 i64() const { + MOZ_ASSERT(tag == I64); + return i64_; + } + RegF32 f32() const { + MOZ_ASSERT(tag == F32); + return f32_; + } + RegF64 f64() const { + MOZ_ASSERT(tag == F64); + return f64_; + } +#ifdef ENABLE_WASM_SIMD + RegV128 v128() const { + MOZ_ASSERT(tag == V128); + return v128_; + } +#endif + RegRef ref() const { + MOZ_ASSERT(tag == REF); + return ref_; + } + + AnyRegister any() const { + switch (tag) { + case F32: + return AnyRegister(f32_); + case F64: + return AnyRegister(f64_); +#ifdef ENABLE_WASM_SIMD + case V128: + return AnyRegister(v128_); +#endif + case I32: + return AnyRegister(i32_); + case I64: +#ifdef JS_PUNBOX64 + return AnyRegister(i64_.reg); +#else + // The compiler is written so that this is never needed: any() is + // called on arbitrary registers for asm.js but asm.js does not have + // 64-bit ints. For wasm, any() is called on arbitrary registers + // only on 64-bit platforms. + MOZ_CRASH("AnyReg::any() on 32-bit platform"); +#endif + case REF: + MOZ_CRASH("AnyReg::any() not implemented for ref types"); + default: + MOZ_CRASH(); + } + // Work around GCC 5 analysis/warning bug. + MOZ_CRASH("AnyReg::any(): impossible case"); + } +}; + +////////////////////////////////////////////////////////////////////////////// +// +// Platform-specific registers. +// +// All platforms must define struct SpecificRegs. All 32-bit platforms must +// have an abiReturnRegI64 member in that struct. + +#if defined(JS_CODEGEN_X64) +struct SpecificRegs { + RegI32 eax, ecx, edx, edi, esi; + RegI64 rax, rcx, rdx; + + SpecificRegs() + : eax(RegI32(js::jit::eax)), + ecx(RegI32(js::jit::ecx)), + edx(RegI32(js::jit::edx)), + edi(RegI32(js::jit::edi)), + esi(RegI32(js::jit::esi)), + rax(RegI64(Register64(js::jit::rax))), + rcx(RegI64(Register64(js::jit::rcx))), + rdx(RegI64(Register64(js::jit::rdx))) {} +}; +#elif defined(JS_CODEGEN_X86) +struct SpecificRegs { + RegI32 eax, ecx, edx, edi, esi; + RegI64 ecx_ebx, edx_eax, abiReturnRegI64; + + SpecificRegs() + : eax(RegI32(js::jit::eax)), + ecx(RegI32(js::jit::ecx)), + edx(RegI32(js::jit::edx)), + edi(RegI32(js::jit::edi)), + esi(RegI32(js::jit::esi)), + ecx_ebx(RegI64(Register64(js::jit::ecx, js::jit::ebx))), + edx_eax(RegI64(Register64(js::jit::edx, js::jit::eax))), + abiReturnRegI64(edx_eax) {} +}; +#elif defined(JS_CODEGEN_ARM) +struct SpecificRegs { + RegI64 abiReturnRegI64; + + SpecificRegs() : abiReturnRegI64(ReturnReg64) {} +}; +#elif defined(JS_CODEGEN_ARM64) || defined(JS_CODEGEN_MIPS64) || \ + defined(JS_CODEGEN_LOONG64) || defined(JS_CODEGEN_RISCV64) +struct SpecificRegs { + // Required by gcc. + SpecificRegs() {} +}; +#else +struct SpecificRegs { +# ifndef JS_64BIT + RegI64 abiReturnRegI64; +# endif + + SpecificRegs() { MOZ_CRASH("BaseCompiler porting interface: SpecificRegs"); } +}; +#endif + +////////////////////////////////////////////////////////////////////////////// +// +// Register allocator. + +class BaseRegAlloc { + // Notes on float register allocation. + // + // The general rule in SpiderMonkey is that float registers can alias double + // registers, but there are predicates to handle exceptions to that rule: + // hasUnaliasedDouble() and hasMultiAlias(). The way aliasing actually + // works is platform dependent and exposed through the aliased(n, &r) + // predicate, etc. + // + // - hasUnaliasedDouble(): on ARM VFPv3-D32 there are double registers that + // cannot be treated as float. + // - hasMultiAlias(): on ARM and MIPS a double register aliases two float + // registers. + // + // On some platforms (x86, x64, ARM64) but not all (ARM) + // ScratchFloat32Register is the same as ScratchDoubleRegister. + // + // It's a basic invariant of the AllocatableRegisterSet that it deals + // properly with aliasing of registers: if s0 or s1 are allocated then d0 is + // not allocatable; if s0 and s1 are freed individually then d0 becomes + // allocatable. + + BaseCompiler* bc; + AllocatableGeneralRegisterSet availGPR; + AllocatableFloatRegisterSet availFPU; +#ifdef DEBUG + // The registers available after removing ScratchReg, HeapReg, etc. + AllocatableGeneralRegisterSet allGPR; + AllocatableFloatRegisterSet allFPU; + uint32_t scratchTaken; +#endif +#ifdef JS_CODEGEN_X86 + AllocatableGeneralRegisterSet singleByteRegs; +#endif + + bool hasGPR() { return !availGPR.empty(); } + + bool hasGPR64() { +#ifdef JS_PUNBOX64 + return !availGPR.empty(); +#else + if (availGPR.empty()) { + return false; + } + Register r = allocGPR(); + bool available = !availGPR.empty(); + freeGPR(r); + return available; +#endif + } + + template <MIRType t> + bool hasFPU() { + return availFPU.hasAny<RegTypeOf<t>::value>(); + } + + bool isAvailableGPR(Register r) { return availGPR.has(r); } + + bool isAvailableFPU(FloatRegister r) { return availFPU.has(r); } + + void allocGPR(Register r) { + MOZ_ASSERT(isAvailableGPR(r)); + availGPR.take(r); + } + + Register allocGPR() { + MOZ_ASSERT(hasGPR()); + return availGPR.takeAny(); + } + + void allocInt64(Register64 r) { +#ifdef JS_PUNBOX64 + allocGPR(r.reg); +#else + allocGPR(r.low); + allocGPR(r.high); +#endif + } + + Register64 allocInt64() { + MOZ_ASSERT(hasGPR64()); +#ifdef JS_PUNBOX64 + return Register64(availGPR.takeAny()); +#else + Register high = availGPR.takeAny(); + Register low = availGPR.takeAny(); + return Register64(high, low); +#endif + } + +#ifdef JS_CODEGEN_ARM + // r12 is normally the ScratchRegister and r13 is always the stack pointer, + // so the highest possible pair has r10 as the even-numbered register. + + static constexpr uint32_t PAIR_LIMIT = 10; + + bool hasGPRPair() { + for (uint32_t i = 0; i <= PAIR_LIMIT; i += 2) { + if (isAvailableGPR(Register::FromCode(i)) && + isAvailableGPR(Register::FromCode(i + 1))) { + return true; + } + } + return false; + } + + void allocGPRPair(Register* low, Register* high) { + MOZ_ASSERT(hasGPRPair()); + for (uint32_t i = 0; i <= PAIR_LIMIT; i += 2) { + if (isAvailableGPR(Register::FromCode(i)) && + isAvailableGPR(Register::FromCode(i + 1))) { + *low = Register::FromCode(i); + *high = Register::FromCode(i + 1); + allocGPR(*low); + allocGPR(*high); + return; + } + } + MOZ_CRASH("No pair"); + } +#endif + + void allocFPU(FloatRegister r) { + MOZ_ASSERT(isAvailableFPU(r)); + availFPU.take(r); + } + + template <MIRType t> + FloatRegister allocFPU() { + return availFPU.takeAny<RegTypeOf<t>::value>(); + } + + void freeGPR(Register r) { availGPR.add(r); } + + void freeInt64(Register64 r) { +#ifdef JS_PUNBOX64 + freeGPR(r.reg); +#else + freeGPR(r.low); + freeGPR(r.high); +#endif + } + + void freeFPU(FloatRegister r) { availFPU.add(r); } + + public: + explicit BaseRegAlloc() + : bc(nullptr), + availGPR(GeneralRegisterSet::All()), + availFPU(FloatRegisterSet::All()) +#ifdef DEBUG + , + scratchTaken(0) +#endif +#ifdef JS_CODEGEN_X86 + , + singleByteRegs(GeneralRegisterSet(Registers::SingleByteRegs)) +#endif + { + RegisterAllocator::takeWasmRegisters(availGPR); + +#ifdef RABALDR_PIN_INSTANCE + // If the InstanceReg is pinned then it is never available for + // allocation. + availGPR.take(InstanceReg); +#endif + + // Allocate any private scratch registers. +#if defined(RABALDR_SCRATCH_I32) + if (RabaldrScratchI32 != RegI32::Invalid()) { + availGPR.take(RabaldrScratchI32); + } +#endif + +#ifdef RABALDR_SCRATCH_F32_ALIASES_F64 + static_assert(RabaldrScratchF32 != InvalidFloatReg, "Float reg definition"); + static_assert(RabaldrScratchF64 != InvalidFloatReg, "Float reg definition"); +#endif + +#if defined(RABALDR_SCRATCH_F32) && !defined(RABALDR_SCRATCH_F32_ALIASES_F64) + if (RabaldrScratchF32 != RegF32::Invalid()) { + availFPU.take(RabaldrScratchF32); + } +#endif + +#if defined(RABALDR_SCRATCH_F64) +# ifdef RABALDR_SCRATCH_F32_ALIASES_F64 + MOZ_ASSERT(availFPU.has(RabaldrScratchF32)); +# endif + if (RabaldrScratchF64 != RegF64::Invalid()) { + availFPU.take(RabaldrScratchF64); + } +# ifdef RABALDR_SCRATCH_F32_ALIASES_F64 + MOZ_ASSERT(!availFPU.has(RabaldrScratchF32)); +# endif +#endif + +#ifdef DEBUG + allGPR = availGPR; + allFPU = availFPU; +#endif + } + + void init(BaseCompiler* bc) { this->bc = bc; } + + enum class ScratchKind { I32 = 1, F32 = 2, F64 = 4, V128 = 8 }; + +#ifdef DEBUG + bool isScratchRegisterTaken(ScratchKind s) const { + return (scratchTaken & uint32_t(s)) != 0; + } + + void setScratchRegisterTaken(ScratchKind s, bool state) { + if (state) { + scratchTaken |= uint32_t(s); + } else { + scratchTaken &= ~uint32_t(s); + } + } +#endif + +#ifdef JS_CODEGEN_X86 + bool isSingleByteI32(Register r) { return singleByteRegs.has(r); } +#endif + + bool isAvailableI32(RegI32 r) { return isAvailableGPR(r); } + + bool isAvailableI64(RegI64 r) { +#ifdef JS_PUNBOX64 + return isAvailableGPR(r.reg); +#else + return isAvailableGPR(r.low) && isAvailableGPR(r.high); +#endif + } + + bool isAvailableRef(RegRef r) { return isAvailableGPR(r); } + + bool isAvailablePtr(RegPtr r) { return isAvailableGPR(r); } + + bool isAvailableF32(RegF32 r) { return isAvailableFPU(r); } + + bool isAvailableF64(RegF64 r) { return isAvailableFPU(r); } + +#ifdef ENABLE_WASM_SIMD + bool isAvailableV128(RegV128 r) { return isAvailableFPU(r); } +#endif + + [[nodiscard]] inline RegI32 needI32(); + inline void needI32(RegI32 specific); + + [[nodiscard]] inline RegI64 needI64(); + inline void needI64(RegI64 specific); + + [[nodiscard]] inline RegRef needRef(); + inline void needRef(RegRef specific); + + [[nodiscard]] inline RegPtr needPtr(); + inline void needPtr(RegPtr specific); + + [[nodiscard]] inline RegF32 needF32(); + inline void needF32(RegF32 specific); + + [[nodiscard]] inline RegF64 needF64(); + inline void needF64(RegF64 specific); + +#ifdef ENABLE_WASM_SIMD + [[nodiscard]] inline RegV128 needV128(); + inline void needV128(RegV128 specific); +#endif + + inline void freeI32(RegI32 r); + inline void freeI64(RegI64 r); + inline void freeRef(RegRef r); + inline void freePtr(RegPtr r); + inline void freeF64(RegF64 r); + inline void freeF32(RegF32 r); +#ifdef ENABLE_WASM_SIMD + inline void freeV128(RegV128 r); +#endif + + // Use when you need a register for a short time but explicitly want to avoid + // a full sync(). + [[nodiscard]] inline RegPtr needTempPtr(RegPtr fallback, bool* saved); + inline void freeTempPtr(RegPtr r, bool saved); + +#ifdef JS_CODEGEN_ARM + [[nodiscard]] inline RegI64 needI64Pair(); +#endif + +#ifdef DEBUG + friend class LeakCheck; + + class MOZ_RAII LeakCheck { + private: + const BaseRegAlloc& ra; + AllocatableGeneralRegisterSet knownGPR_; + AllocatableFloatRegisterSet knownFPU_; + + public: + explicit LeakCheck(const BaseRegAlloc& ra) : ra(ra) { + knownGPR_ = ra.availGPR; + knownFPU_ = ra.availFPU; + } + + ~LeakCheck() { + MOZ_ASSERT(knownGPR_.bits() == ra.allGPR.bits()); + MOZ_ASSERT(knownFPU_.bits() == ra.allFPU.bits()); + } + + void addKnownI32(RegI32 r) { knownGPR_.add(r); } + + void addKnownI64(RegI64 r) { +# ifdef JS_PUNBOX64 + knownGPR_.add(r.reg); +# else + knownGPR_.add(r.high); + knownGPR_.add(r.low); +# endif + } + + void addKnownF32(RegF32 r) { knownFPU_.add(r); } + + void addKnownF64(RegF64 r) { knownFPU_.add(r); } + +# ifdef ENABLE_WASM_SIMD + void addKnownV128(RegV128 r) { knownFPU_.add(r); } +# endif + + void addKnownRef(RegRef r) { knownGPR_.add(r); } + }; +#endif +}; + +// Scratch register abstractions. +// +// We define our own scratch registers when the platform doesn't provide what we +// need. A notable use case is that we will need a private scratch register +// when the platform masm uses its scratch register very frequently (eg, ARM). + +class BaseScratchRegister { +#ifdef DEBUG + BaseRegAlloc& ra; + BaseRegAlloc::ScratchKind kind_; + + public: + explicit BaseScratchRegister(BaseRegAlloc& ra, BaseRegAlloc::ScratchKind kind) + : ra(ra), kind_(kind) { + MOZ_ASSERT(!ra.isScratchRegisterTaken(kind_)); + ra.setScratchRegisterTaken(kind_, true); + } + ~BaseScratchRegister() { + MOZ_ASSERT(ra.isScratchRegisterTaken(kind_)); + ra.setScratchRegisterTaken(kind_, false); + } +#else + public: + explicit BaseScratchRegister(BaseRegAlloc& ra, + BaseRegAlloc::ScratchKind kind) {} +#endif +}; + +#ifdef ENABLE_WASM_SIMD +# ifdef RABALDR_SCRATCH_V128 +class ScratchV128 : public BaseScratchRegister { + public: + explicit ScratchV128(BaseRegAlloc& ra) + : BaseScratchRegister(ra, BaseRegAlloc::ScratchKind::V128) {} + operator RegV128() const { return RegV128(RabaldrScratchV128); } +}; +# else +class ScratchV128 : public ScratchSimd128Scope { + public: + explicit ScratchV128(MacroAssembler& m) : ScratchSimd128Scope(m) {} + operator RegV128() const { return RegV128(FloatRegister(*this)); } +}; +# endif +#endif + +#ifdef RABALDR_SCRATCH_F64 +class ScratchF64 : public BaseScratchRegister { + public: + explicit ScratchF64(BaseRegAlloc& ra) + : BaseScratchRegister(ra, BaseRegAlloc::ScratchKind::F64) {} + operator RegF64() const { return RegF64(RabaldrScratchF64); } +}; +#else +class ScratchF64 : public ScratchDoubleScope { + public: + explicit ScratchF64(MacroAssembler& m) : ScratchDoubleScope(m) {} + operator RegF64() const { return RegF64(FloatRegister(*this)); } +}; +#endif + +#ifdef RABALDR_SCRATCH_F32 +class ScratchF32 : public BaseScratchRegister { + public: + explicit ScratchF32(BaseRegAlloc& ra) + : BaseScratchRegister(ra, BaseRegAlloc::ScratchKind::F32) {} + operator RegF32() const { return RegF32(RabaldrScratchF32); } +}; +#else +class ScratchF32 : public ScratchFloat32Scope { + public: + explicit ScratchF32(MacroAssembler& m) : ScratchFloat32Scope(m) {} + operator RegF32() const { return RegF32(FloatRegister(*this)); } +}; +#endif + +#ifdef RABALDR_SCRATCH_I32 +template <class RegType> +class ScratchGPR : public BaseScratchRegister { + public: + explicit ScratchGPR(BaseRegAlloc& ra) + : BaseScratchRegister(ra, BaseRegAlloc::ScratchKind::I32) {} + operator RegType() const { return RegType(RabaldrScratchI32); } +}; +#else +template <class RegType> +class ScratchGPR : public ScratchRegisterScope { + public: + explicit ScratchGPR(MacroAssembler& m) : ScratchRegisterScope(m) {} + operator RegType() const { return RegType(Register(*this)); } +}; +#endif + +using ScratchI32 = ScratchGPR<RegI32>; +using ScratchPtr = ScratchGPR<RegPtr>; +using ScratchRef = ScratchGPR<RegRef>; + +#if defined(JS_CODEGEN_X86) +// ScratchEBX is a mnemonic device: For some atomic ops we really need EBX, +// no other register will do. And we would normally have to allocate that +// register using ScratchI32 since normally the scratch register is EBX. +// But the whole point of ScratchI32 is to hide that relationship. By using +// the ScratchEBX alias, we document that at that point we require the +// scratch register to be EBX. +using ScratchEBX = ScratchI32; + +// ScratchI8 is a mnemonic device: For some ops we need a register with a +// byte subregister. +using ScratchI8 = ScratchI32; +#endif + +} // namespace wasm +} // namespace js + +#endif // wasm_wasm_baseline_regdefs_h |