| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef V8_ARM64_ASSEMBLER_ARM64_H_ |
| #define V8_ARM64_ASSEMBLER_ARM64_H_ |
| |
| #include <deque> |
| #include <list> |
| #include <map> |
| #include <vector> |
| |
| #include "src/arm64/constants-arm64.h" |
| #include "src/arm64/instructions-arm64.h" |
| #include "src/assembler.h" |
| #include "src/globals.h" |
| #include "src/utils.h" |
| |
| |
| namespace v8 { |
| namespace internal { |
| |
| |
| // ----------------------------------------------------------------------------- |
| // Registers. |
| // clang-format off |
| #define GENERAL_REGISTER_CODE_LIST(R) \ |
| R(0) R(1) R(2) R(3) R(4) R(5) R(6) R(7) \ |
| R(8) R(9) R(10) R(11) R(12) R(13) R(14) R(15) \ |
| R(16) R(17) R(18) R(19) R(20) R(21) R(22) R(23) \ |
| R(24) R(25) R(26) R(27) R(28) R(29) R(30) R(31) |
| |
| #define GENERAL_REGISTERS(R) \ |
| R(x0) R(x1) R(x2) R(x3) R(x4) R(x5) R(x6) R(x7) \ |
| R(x8) R(x9) R(x10) R(x11) R(x12) R(x13) R(x14) R(x15) \ |
| R(x16) R(x17) R(x18) R(x19) R(x20) R(x21) R(x22) R(x23) \ |
| R(x24) R(x25) R(x26) R(x27) R(x28) R(x29) R(x30) R(x31) |
| |
| #define ALLOCATABLE_GENERAL_REGISTERS(R) \ |
| R(x0) R(x1) R(x2) R(x3) R(x4) R(x5) R(x6) R(x7) \ |
| R(x8) R(x9) R(x10) R(x11) R(x12) R(x13) R(x14) R(x15) \ |
| R(x18) R(x19) R(x20) R(x21) R(x22) R(x23) R(x24) R(x27) |
| |
| #define FLOAT_REGISTERS(V) \ |
| V(s0) V(s1) V(s2) V(s3) V(s4) V(s5) V(s6) V(s7) \ |
| V(s8) V(s9) V(s10) V(s11) V(s12) V(s13) V(s14) V(s15) \ |
| V(s16) V(s17) V(s18) V(s19) V(s20) V(s21) V(s22) V(s23) \ |
| V(s24) V(s25) V(s26) V(s27) V(s28) V(s29) V(s30) V(s31) |
| |
| #define DOUBLE_REGISTERS(R) \ |
| R(d0) R(d1) R(d2) R(d3) R(d4) R(d5) R(d6) R(d7) \ |
| R(d8) R(d9) R(d10) R(d11) R(d12) R(d13) R(d14) R(d15) \ |
| R(d16) R(d17) R(d18) R(d19) R(d20) R(d21) R(d22) R(d23) \ |
| R(d24) R(d25) R(d26) R(d27) R(d28) R(d29) R(d30) R(d31) |
| |
| #define SIMD128_REGISTERS(V) \ |
| V(q0) V(q1) V(q2) V(q3) V(q4) V(q5) V(q6) V(q7) \ |
| V(q8) V(q9) V(q10) V(q11) V(q12) V(q13) V(q14) V(q15) |
| |
| #define ALLOCATABLE_DOUBLE_REGISTERS(R) \ |
| R(d0) R(d1) R(d2) R(d3) R(d4) R(d5) R(d6) R(d7) \ |
| R(d8) R(d9) R(d10) R(d11) R(d12) R(d13) R(d14) R(d16) \ |
| R(d17) R(d18) R(d19) R(d20) R(d21) R(d22) R(d23) R(d24) \ |
| R(d25) R(d26) R(d27) R(d28) |
| // clang-format on |
| |
| constexpr int kRegListSizeInBits = sizeof(RegList) * kBitsPerByte; |
| static const int kNoCodeAgeSequenceLength = 5 * kInstructionSize; |
| |
| // Some CPURegister methods can return Register and FPRegister types, so we |
| // need to declare them in advance. |
| struct Register; |
| struct FPRegister; |
| |
| |
| struct CPURegister { |
| enum Code { |
| #define REGISTER_CODE(R) kCode_##R, |
| GENERAL_REGISTERS(REGISTER_CODE) |
| #undef REGISTER_CODE |
| kAfterLast, |
| kCode_no_reg = -1 |
| }; |
| |
| enum RegisterType { |
| // The kInvalid value is used to detect uninitialized static instances, |
| // which are always zero-initialized before any constructors are called. |
| kInvalid = 0, |
| kRegister, |
| kFPRegister, |
| kNoRegister |
| }; |
| |
| constexpr CPURegister() : CPURegister(0, 0, CPURegister::kNoRegister) {} |
| |
| constexpr CPURegister(int reg_code, int reg_size, RegisterType reg_type) |
| : reg_code(reg_code), reg_size(reg_size), reg_type(reg_type) {} |
| |
| static CPURegister Create(int code, int size, RegisterType type) { |
| CPURegister r = {code, size, type}; |
| return r; |
| } |
| |
| int code() const; |
| RegisterType type() const; |
| RegList Bit() const; |
| int SizeInBits() const; |
| int SizeInBytes() const; |
| bool Is32Bits() const; |
| bool Is64Bits() const; |
| bool IsValid() const; |
| bool IsValidOrNone() const; |
| bool IsValidRegister() const; |
| bool IsValidFPRegister() const; |
| bool IsNone() const; |
| bool Is(const CPURegister& other) const; |
| bool Aliases(const CPURegister& other) const; |
| |
| bool IsZero() const; |
| bool IsSP() const; |
| |
| bool IsRegister() const; |
| bool IsFPRegister() const; |
| |
| Register X() const; |
| Register W() const; |
| FPRegister D() const; |
| FPRegister S() const; |
| |
| bool IsSameSizeAndType(const CPURegister& other) const; |
| |
| // V8 compatibility. |
| bool is(const CPURegister& other) const { return Is(other); } |
| bool is_valid() const { return IsValid(); } |
| |
| int reg_code; |
| int reg_size; |
| RegisterType reg_type; |
| }; |
| |
| |
| struct Register : public CPURegister { |
| static Register Create(int code, int size) { |
| return Register(CPURegister::Create(code, size, CPURegister::kRegister)); |
| } |
| |
| constexpr Register() : CPURegister() {} |
| |
| constexpr explicit Register(const CPURegister& r) : CPURegister(r) {} |
| |
| bool IsValid() const { |
| DCHECK(IsRegister() || IsNone()); |
| return IsValidRegister(); |
| } |
| |
| static Register XRegFromCode(unsigned code); |
| static Register WRegFromCode(unsigned code); |
| |
| // Start of V8 compatibility section --------------------- |
| // These memebers are necessary for compilation. |
| // A few of them may be unused for now. |
| |
| static constexpr int kNumRegisters = kNumberOfRegisters; |
| STATIC_ASSERT(kNumRegisters == Code::kAfterLast); |
| static int NumRegisters() { return kNumRegisters; } |
| |
| // We allow crankshaft to use the following registers: |
| // - x0 to x15 |
| // - x18 to x24 |
| // - x27 (also context) |
| // |
| // TODO(all): Register x25 is currently free and could be available for |
| // crankshaft, but we don't use it as we might use it as a per function |
| // literal pool pointer in the future. |
| // |
| // TODO(all): Consider storing cp in x25 to have only two ranges. |
| // We split allocatable registers in three ranges called |
| // - "low range" |
| // - "high range" |
| // - "context" |
| |
| static Register from_code(int code) { |
| // Always return an X register. |
| return Register::Create(code, kXRegSizeInBits); |
| } |
| |
| // End of V8 compatibility section ----------------------- |
| }; |
| |
| constexpr bool kSimpleFPAliasing = true; |
| constexpr bool kSimdMaskRegisters = false; |
| |
| struct FPRegister : public CPURegister { |
| enum Code { |
| #define REGISTER_CODE(R) kCode_##R, |
| DOUBLE_REGISTERS(REGISTER_CODE) |
| #undef REGISTER_CODE |
| kAfterLast, |
| kCode_no_reg = -1 |
| }; |
| |
| static FPRegister Create(int code, int size) { |
| return FPRegister( |
| CPURegister::Create(code, size, CPURegister::kFPRegister)); |
| } |
| |
| constexpr FPRegister() : CPURegister() {} |
| |
| constexpr explicit FPRegister(const CPURegister& r) : CPURegister(r) {} |
| |
| bool IsValid() const { |
| DCHECK(IsFPRegister() || IsNone()); |
| return IsValidFPRegister(); |
| } |
| |
| static FPRegister SRegFromCode(unsigned code); |
| static FPRegister DRegFromCode(unsigned code); |
| |
| // Start of V8 compatibility section --------------------- |
| static constexpr int kMaxNumRegisters = kNumberOfFPRegisters; |
| STATIC_ASSERT(kMaxNumRegisters == Code::kAfterLast); |
| |
| // Crankshaft can use all the FP registers except: |
| // - d15 which is used to keep the 0 double value |
| // - d30 which is used in crankshaft as a double scratch register |
| // - d31 which is used in the MacroAssembler as a double scratch register |
| static FPRegister from_code(int code) { |
| // Always return a D register. |
| return FPRegister::Create(code, kDRegSizeInBits); |
| } |
| // End of V8 compatibility section ----------------------- |
| }; |
| |
| |
| STATIC_ASSERT(sizeof(CPURegister) == sizeof(Register)); |
| STATIC_ASSERT(sizeof(CPURegister) == sizeof(FPRegister)); |
| |
| #define DEFINE_REGISTER(register_class, name, code, size, type) \ |
| constexpr register_class name { CPURegister(code, size, type) } |
| #define ALIAS_REGISTER(register_class, alias, name) \ |
| constexpr register_class alias = name |
| |
| // No*Reg is used to indicate an unused argument, or an error case. Note that |
| // these all compare equal (using the Is() method). The Register and FPRegister |
| // variants are provided for convenience. |
| DEFINE_REGISTER(Register, NoReg, 0, 0, CPURegister::kNoRegister); |
| DEFINE_REGISTER(FPRegister, NoFPReg, 0, 0, CPURegister::kNoRegister); |
| DEFINE_REGISTER(CPURegister, NoCPUReg, 0, 0, CPURegister::kNoRegister); |
| |
| // v8 compatibility. |
| DEFINE_REGISTER(Register, no_reg, 0, 0, CPURegister::kNoRegister); |
| |
| #define DEFINE_REGISTERS(N) \ |
| DEFINE_REGISTER(Register, w##N, N, kWRegSizeInBits, CPURegister::kRegister); \ |
| DEFINE_REGISTER(Register, x##N, N, kXRegSizeInBits, CPURegister::kRegister); |
| GENERAL_REGISTER_CODE_LIST(DEFINE_REGISTERS) |
| #undef DEFINE_REGISTERS |
| |
| DEFINE_REGISTER(Register, wcsp, kSPRegInternalCode, kWRegSizeInBits, |
| CPURegister::kRegister); |
| DEFINE_REGISTER(Register, csp, kSPRegInternalCode, kXRegSizeInBits, |
| CPURegister::kRegister); |
| |
| #define DEFINE_FPREGISTERS(N) \ |
| DEFINE_REGISTER(FPRegister, s##N, N, kSRegSizeInBits, \ |
| CPURegister::kFPRegister); \ |
| DEFINE_REGISTER(FPRegister, d##N, N, kDRegSizeInBits, \ |
| CPURegister::kFPRegister); |
| GENERAL_REGISTER_CODE_LIST(DEFINE_FPREGISTERS) |
| #undef DEFINE_FPREGISTERS |
| |
| #undef DEFINE_REGISTER |
| |
| // Registers aliases. |
| ALIAS_REGISTER(Register, ip0, x16); |
| ALIAS_REGISTER(Register, ip1, x17); |
| ALIAS_REGISTER(Register, wip0, w16); |
| ALIAS_REGISTER(Register, wip1, w17); |
| // Root register. |
| ALIAS_REGISTER(Register, root, x26); |
| ALIAS_REGISTER(Register, rr, x26); |
| // Context pointer register. |
| ALIAS_REGISTER(Register, cp, x27); |
| // We use a register as a JS stack pointer to overcome the restriction on the |
| // architectural SP alignment. |
| // We chose x28 because it is contiguous with the other specific purpose |
| // registers. |
| STATIC_ASSERT(kJSSPCode == 28); |
| ALIAS_REGISTER(Register, jssp, x28); |
| ALIAS_REGISTER(Register, wjssp, w28); |
| ALIAS_REGISTER(Register, fp, x29); |
| ALIAS_REGISTER(Register, lr, x30); |
| ALIAS_REGISTER(Register, xzr, x31); |
| ALIAS_REGISTER(Register, wzr, w31); |
| |
| // Keeps the 0 double value. |
| ALIAS_REGISTER(FPRegister, fp_zero, d15); |
| // Crankshaft double scratch register. |
| ALIAS_REGISTER(FPRegister, crankshaft_fp_scratch, d29); |
| // MacroAssembler double scratch registers. |
| ALIAS_REGISTER(FPRegister, fp_scratch, d30); |
| ALIAS_REGISTER(FPRegister, fp_scratch1, d30); |
| ALIAS_REGISTER(FPRegister, fp_scratch2, d31); |
| |
| #undef ALIAS_REGISTER |
| |
| |
| Register GetAllocatableRegisterThatIsNotOneOf(Register reg1, |
| Register reg2 = NoReg, |
| Register reg3 = NoReg, |
| Register reg4 = NoReg); |
| |
| |
| // AreAliased returns true if any of the named registers overlap. Arguments set |
| // to NoReg are ignored. The system stack pointer may be specified. |
| bool AreAliased(const CPURegister& reg1, |
| const CPURegister& reg2, |
| const CPURegister& reg3 = NoReg, |
| const CPURegister& reg4 = NoReg, |
| const CPURegister& reg5 = NoReg, |
| const CPURegister& reg6 = NoReg, |
| const CPURegister& reg7 = NoReg, |
| const CPURegister& reg8 = NoReg); |
| |
| // AreSameSizeAndType returns true if all of the specified registers have the |
| // same size, and are of the same type. The system stack pointer may be |
| // specified. Arguments set to NoReg are ignored, as are any subsequent |
| // arguments. At least one argument (reg1) must be valid (not NoCPUReg). |
| bool AreSameSizeAndType(const CPURegister& reg1, |
| const CPURegister& reg2, |
| const CPURegister& reg3 = NoCPUReg, |
| const CPURegister& reg4 = NoCPUReg, |
| const CPURegister& reg5 = NoCPUReg, |
| const CPURegister& reg6 = NoCPUReg, |
| const CPURegister& reg7 = NoCPUReg, |
| const CPURegister& reg8 = NoCPUReg); |
| |
| typedef FPRegister FloatRegister; |
| typedef FPRegister DoubleRegister; |
| |
| // TODO(arm64) Define SIMD registers. |
| typedef FPRegister Simd128Register; |
| |
| // ----------------------------------------------------------------------------- |
| // Lists of registers. |
| class CPURegList { |
| public: |
| explicit CPURegList(CPURegister reg1, |
| CPURegister reg2 = NoCPUReg, |
| CPURegister reg3 = NoCPUReg, |
| CPURegister reg4 = NoCPUReg) |
| : list_(reg1.Bit() | reg2.Bit() | reg3.Bit() | reg4.Bit()), |
| size_(reg1.SizeInBits()), type_(reg1.type()) { |
| DCHECK(AreSameSizeAndType(reg1, reg2, reg3, reg4)); |
| DCHECK(IsValid()); |
| } |
| |
| CPURegList(CPURegister::RegisterType type, int size, RegList list) |
| : list_(list), size_(size), type_(type) { |
| DCHECK(IsValid()); |
| } |
| |
| CPURegList(CPURegister::RegisterType type, int size, int first_reg, |
| int last_reg) |
| : size_(size), type_(type) { |
| DCHECK(((type == CPURegister::kRegister) && |
| (last_reg < kNumberOfRegisters)) || |
| ((type == CPURegister::kFPRegister) && |
| (last_reg < kNumberOfFPRegisters))); |
| DCHECK(last_reg >= first_reg); |
| list_ = (1UL << (last_reg + 1)) - 1; |
| list_ &= ~((1UL << first_reg) - 1); |
| DCHECK(IsValid()); |
| } |
| |
| CPURegister::RegisterType type() const { |
| DCHECK(IsValid()); |
| return type_; |
| } |
| |
| RegList list() const { |
| DCHECK(IsValid()); |
| return list_; |
| } |
| |
| inline void set_list(RegList new_list) { |
| DCHECK(IsValid()); |
| list_ = new_list; |
| } |
| |
| // Combine another CPURegList into this one. Registers that already exist in |
| // this list are left unchanged. The type and size of the registers in the |
| // 'other' list must match those in this list. |
| void Combine(const CPURegList& other); |
| |
| // Remove every register in the other CPURegList from this one. Registers that |
| // do not exist in this list are ignored. The type of the registers in the |
| // 'other' list must match those in this list. |
| void Remove(const CPURegList& other); |
| |
| // Variants of Combine and Remove which take CPURegisters. |
| void Combine(const CPURegister& other); |
| void Remove(const CPURegister& other1, |
| const CPURegister& other2 = NoCPUReg, |
| const CPURegister& other3 = NoCPUReg, |
| const CPURegister& other4 = NoCPUReg); |
| |
| // Variants of Combine and Remove which take a single register by its code; |
| // the type and size of the register is inferred from this list. |
| void Combine(int code); |
| void Remove(int code); |
| |
| // Remove all callee-saved registers from the list. This can be useful when |
| // preparing registers for an AAPCS64 function call, for example. |
| void RemoveCalleeSaved(); |
| |
| CPURegister PopLowestIndex(); |
| CPURegister PopHighestIndex(); |
| |
| // AAPCS64 callee-saved registers. |
| static CPURegList GetCalleeSaved(int size = kXRegSizeInBits); |
| static CPURegList GetCalleeSavedFP(int size = kDRegSizeInBits); |
| |
| // AAPCS64 caller-saved registers. Note that this includes lr. |
| static CPURegList GetCallerSaved(int size = kXRegSizeInBits); |
| static CPURegList GetCallerSavedFP(int size = kDRegSizeInBits); |
| |
| // Registers saved as safepoints. |
| static CPURegList GetSafepointSavedRegisters(); |
| |
| bool IsEmpty() const { |
| DCHECK(IsValid()); |
| return list_ == 0; |
| } |
| |
| bool IncludesAliasOf(const CPURegister& other1, |
| const CPURegister& other2 = NoCPUReg, |
| const CPURegister& other3 = NoCPUReg, |
| const CPURegister& other4 = NoCPUReg) const { |
| DCHECK(IsValid()); |
| RegList list = 0; |
| if (!other1.IsNone() && (other1.type() == type_)) list |= other1.Bit(); |
| if (!other2.IsNone() && (other2.type() == type_)) list |= other2.Bit(); |
| if (!other3.IsNone() && (other3.type() == type_)) list |= other3.Bit(); |
| if (!other4.IsNone() && (other4.type() == type_)) list |= other4.Bit(); |
| return (list_ & list) != 0; |
| } |
| |
| int Count() const { |
| DCHECK(IsValid()); |
| return CountSetBits(list_, kRegListSizeInBits); |
| } |
| |
| int RegisterSizeInBits() const { |
| DCHECK(IsValid()); |
| return size_; |
| } |
| |
| int RegisterSizeInBytes() const { |
| int size_in_bits = RegisterSizeInBits(); |
| DCHECK((size_in_bits % kBitsPerByte) == 0); |
| return size_in_bits / kBitsPerByte; |
| } |
| |
| int TotalSizeInBytes() const { |
| DCHECK(IsValid()); |
| return RegisterSizeInBytes() * Count(); |
| } |
| |
| private: |
| RegList list_; |
| int size_; |
| CPURegister::RegisterType type_; |
| |
| bool IsValid() const { |
| const RegList kValidRegisters = 0x8000000ffffffff; |
| const RegList kValidFPRegisters = 0x0000000ffffffff; |
| switch (type_) { |
| case CPURegister::kRegister: |
| return (list_ & kValidRegisters) == list_; |
| case CPURegister::kFPRegister: |
| return (list_ & kValidFPRegisters) == list_; |
| case CPURegister::kNoRegister: |
| return list_ == 0; |
| default: |
| UNREACHABLE(); |
| return false; |
| } |
| } |
| }; |
| |
| |
| // AAPCS64 callee-saved registers. |
| #define kCalleeSaved CPURegList::GetCalleeSaved() |
| #define kCalleeSavedFP CPURegList::GetCalleeSavedFP() |
| |
| |
| // AAPCS64 caller-saved registers. Note that this includes lr. |
| #define kCallerSaved CPURegList::GetCallerSaved() |
| #define kCallerSavedFP CPURegList::GetCallerSavedFP() |
| |
| // ----------------------------------------------------------------------------- |
| // Immediates. |
| class Immediate { |
| public: |
| template<typename T> |
| inline explicit Immediate(Handle<T> handle); |
| |
| // This is allowed to be an implicit constructor because Immediate is |
| // a wrapper class that doesn't normally perform any type conversion. |
| template<typename T> |
| inline Immediate(T value); // NOLINT(runtime/explicit) |
| |
| template<typename T> |
| inline Immediate(T value, RelocInfo::Mode rmode); |
| |
| int64_t value() const { return value_; } |
| RelocInfo::Mode rmode() const { return rmode_; } |
| |
| private: |
| void InitializeHandle(Handle<Object> value); |
| |
| int64_t value_; |
| RelocInfo::Mode rmode_; |
| }; |
| |
| |
| // ----------------------------------------------------------------------------- |
| // Operands. |
| constexpr int kSmiShift = kSmiTagSize + kSmiShiftSize; |
| constexpr uint64_t kSmiShiftMask = (1UL << kSmiShift) - 1; |
| |
| // Represents an operand in a machine instruction. |
| class Operand { |
| // TODO(all): If necessary, study more in details which methods |
| // TODO(all): should be inlined or not. |
| public: |
| // rm, {<shift> {#<shift_amount>}} |
| // where <shift> is one of {LSL, LSR, ASR, ROR}. |
| // <shift_amount> is uint6_t. |
| // This is allowed to be an implicit constructor because Operand is |
| // a wrapper class that doesn't normally perform any type conversion. |
| inline Operand(Register reg, |
| Shift shift = LSL, |
| unsigned shift_amount = 0); // NOLINT(runtime/explicit) |
| |
| // rm, <extend> {#<shift_amount>} |
| // where <extend> is one of {UXTB, UXTH, UXTW, UXTX, SXTB, SXTH, SXTW, SXTX}. |
| // <shift_amount> is uint2_t. |
| inline Operand(Register reg, |
| Extend extend, |
| unsigned shift_amount = 0); |
| |
| template<typename T> |
| inline explicit Operand(Handle<T> handle); |
| |
| // Implicit constructor for all int types, ExternalReference, and Smi. |
| template<typename T> |
| inline Operand(T t); // NOLINT(runtime/explicit) |
| |
| // Implicit constructor for int types. |
| template<typename T> |
| inline Operand(T t, RelocInfo::Mode rmode); |
| |
| inline bool IsImmediate() const; |
| inline bool IsShiftedRegister() const; |
| inline bool IsExtendedRegister() const; |
| inline bool IsZero() const; |
| |
| // This returns an LSL shift (<= 4) operand as an equivalent extend operand, |
| // which helps in the encoding of instructions that use the stack pointer. |
| inline Operand ToExtendedRegister() const; |
| |
| inline Immediate immediate() const; |
| inline int64_t ImmediateValue() const; |
| inline Register reg() const; |
| inline Shift shift() const; |
| inline Extend extend() const; |
| inline unsigned shift_amount() const; |
| |
| // Relocation information. |
| bool NeedsRelocation(const Assembler* assembler) const; |
| |
| // Helpers |
| inline static Operand UntagSmi(Register smi); |
| inline static Operand UntagSmiAndScale(Register smi, int scale); |
| |
| private: |
| Immediate immediate_; |
| Register reg_; |
| Shift shift_; |
| Extend extend_; |
| unsigned shift_amount_; |
| }; |
| |
| |
| // MemOperand represents a memory operand in a load or store instruction. |
| class MemOperand { |
| public: |
| inline MemOperand(); |
| inline explicit MemOperand(Register base, |
| int64_t offset = 0, |
| AddrMode addrmode = Offset); |
| inline explicit MemOperand(Register base, |
| Register regoffset, |
| Shift shift = LSL, |
| unsigned shift_amount = 0); |
| inline explicit MemOperand(Register base, |
| Register regoffset, |
| Extend extend, |
| unsigned shift_amount = 0); |
| inline explicit MemOperand(Register base, |
| const Operand& offset, |
| AddrMode addrmode = Offset); |
| |
| const Register& base() const { return base_; } |
| const Register& regoffset() const { return regoffset_; } |
| int64_t offset() const { return offset_; } |
| AddrMode addrmode() const { return addrmode_; } |
| Shift shift() const { return shift_; } |
| Extend extend() const { return extend_; } |
| unsigned shift_amount() const { return shift_amount_; } |
| inline bool IsImmediateOffset() const; |
| inline bool IsRegisterOffset() const; |
| inline bool IsPreIndex() const; |
| inline bool IsPostIndex() const; |
| |
| // For offset modes, return the offset as an Operand. This helper cannot |
| // handle indexed modes. |
| inline Operand OffsetAsOperand() const; |
| |
| enum PairResult { |
| kNotPair, // Can't use a pair instruction. |
| kPairAB, // Can use a pair instruction (operandA has lower address). |
| kPairBA // Can use a pair instruction (operandB has lower address). |
| }; |
| // Check if two MemOperand are consistent for stp/ldp use. |
| static PairResult AreConsistentForPair(const MemOperand& operandA, |
| const MemOperand& operandB, |
| int access_size_log2 = kXRegSizeLog2); |
| |
| private: |
| Register base_; |
| Register regoffset_; |
| int64_t offset_; |
| AddrMode addrmode_; |
| Shift shift_; |
| Extend extend_; |
| unsigned shift_amount_; |
| }; |
| |
| |
| class ConstPool { |
| public: |
| explicit ConstPool(Assembler* assm) |
| : assm_(assm), |
| first_use_(-1), |
| shared_entries_count(0) {} |
| void RecordEntry(intptr_t data, RelocInfo::Mode mode); |
| int EntryCount() const { |
| return shared_entries_count + static_cast<int>(unique_entries_.size()); |
| } |
| bool IsEmpty() const { |
| return shared_entries_.empty() && unique_entries_.empty(); |
| } |
| // Distance in bytes between the current pc and the first instruction |
| // using the pool. If there are no pending entries return kMaxInt. |
| int DistanceToFirstUse(); |
| // Offset after which instructions using the pool will be out of range. |
| int MaxPcOffset(); |
| // Maximum size the constant pool can be with current entries. It always |
| // includes alignment padding and branch over. |
| int WorstCaseSize(); |
| // Size in bytes of the literal pool *if* it is emitted at the current |
| // pc. The size will include the branch over the pool if it was requested. |
| int SizeIfEmittedAtCurrentPc(bool require_jump); |
| // Emit the literal pool at the current pc with a branch over the pool if |
| // requested. |
| void Emit(bool require_jump); |
| // Discard any pending pool entries. |
| void Clear(); |
| |
| private: |
| bool CanBeShared(RelocInfo::Mode mode); |
| void EmitMarker(); |
| void EmitGuard(); |
| void EmitEntries(); |
| |
| Assembler* assm_; |
| // Keep track of the first instruction requiring a constant pool entry |
| // since the previous constant pool was emitted. |
| int first_use_; |
| // values, pc offset(s) of entries which can be shared. |
| std::multimap<uint64_t, int> shared_entries_; |
| // Number of distinct literal in shared entries. |
| int shared_entries_count; |
| // values, pc offset of entries which cannot be shared. |
| std::vector<std::pair<uint64_t, int> > unique_entries_; |
| }; |
| |
| |
| // ----------------------------------------------------------------------------- |
| // Assembler. |
| |
| class Assembler : public AssemblerBase { |
| public: |
| // Create an assembler. Instructions and relocation information are emitted |
| // into a buffer, with the instructions starting from the beginning and the |
| // relocation information starting from the end of the buffer. See CodeDesc |
| // for a detailed comment on the layout (globals.h). |
| // |
| // If the provided buffer is NULL, the assembler allocates and grows its own |
| // buffer, and buffer_size determines the initial buffer size. The buffer is |
| // owned by the assembler and deallocated upon destruction of the assembler. |
| // |
| // If the provided buffer is not NULL, the assembler uses the provided buffer |
| // for code generation and assumes its size to be buffer_size. If the buffer |
| // is too small, a fatal error occurs. No deallocation of the buffer is done |
| // upon destruction of the assembler. |
| Assembler(Isolate* isolate, void* buffer, int buffer_size) |
| : Assembler(IsolateData(isolate), buffer, buffer_size) {} |
| Assembler(IsolateData isolate_data, void* buffer, int buffer_size); |
| |
| virtual ~Assembler(); |
| |
| virtual void AbortedCodeGeneration() { |
| constpool_.Clear(); |
| } |
| |
| // System functions --------------------------------------------------------- |
| // Start generating code from the beginning of the buffer, discarding any code |
| // and data that has already been emitted into the buffer. |
| // |
| // In order to avoid any accidental transfer of state, Reset DCHECKs that the |
| // constant pool is not blocked. |
| void Reset(); |
| |
| // GetCode emits any pending (non-emitted) code and fills the descriptor |
| // desc. GetCode() is idempotent; it returns the same result if no other |
| // Assembler functions are invoked in between GetCode() calls. |
| // |
| // The descriptor (desc) can be NULL. In that case, the code is finalized as |
| // usual, but the descriptor is not populated. |
| void GetCode(CodeDesc* desc); |
| |
| // Insert the smallest number of nop instructions |
| // possible to align the pc offset to a multiple |
| // of m. m must be a power of 2 (>= 4). |
| void Align(int m); |
| // Insert the smallest number of zero bytes possible to align the pc offset |
| // to a mulitple of m. m must be a power of 2 (>= 2). |
| void DataAlign(int m); |
| |
| inline void Unreachable(); |
| |
| // Label -------------------------------------------------------------------- |
| // Bind a label to the current pc. Note that labels can only be bound once, |
| // and if labels are linked to other instructions, they _must_ be bound |
| // before they go out of scope. |
| void bind(Label* label); |
| |
| |
| // RelocInfo and pools ------------------------------------------------------ |
| |
| // Record relocation information for current pc_. |
| void RecordRelocInfo(RelocInfo::Mode rmode, intptr_t data = 0); |
| |
| // Return the address in the constant pool of the code target address used by |
| // the branch/call instruction at pc. |
| inline static Address target_pointer_address_at(Address pc); |
| |
| // Read/Modify the code target address in the branch/call instruction at pc. |
| // The isolate argument is unused (and may be nullptr) when skipping flushing. |
| inline static Address target_address_at(Address pc, Address constant_pool); |
| inline static void set_target_address_at( |
| Isolate* isolate, Address pc, Address constant_pool, Address target, |
| ICacheFlushMode icache_flush_mode = FLUSH_ICACHE_IF_NEEDED); |
| static inline Address target_address_at(Address pc, Code* code); |
| static inline void set_target_address_at( |
| Isolate* isolate, Address pc, Code* code, Address target, |
| ICacheFlushMode icache_flush_mode = FLUSH_ICACHE_IF_NEEDED); |
| |
| // Return the code target address at a call site from the return address of |
| // that call in the instruction stream. |
| inline static Address target_address_from_return_address(Address pc); |
| |
| // Given the address of the beginning of a call, return the address in the |
| // instruction stream that call will return from. |
| inline static Address return_address_from_call_start(Address pc); |
| |
| // This sets the branch destination (which is in the constant pool on ARM). |
| // This is for calls and branches within generated code. |
| inline static void deserialization_set_special_target_at( |
| Isolate* isolate, Address constant_pool_entry, Code* code, |
| Address target); |
| |
| // This sets the internal reference at the pc. |
| inline static void deserialization_set_target_internal_reference_at( |
| Isolate* isolate, Address pc, Address target, |
| RelocInfo::Mode mode = RelocInfo::INTERNAL_REFERENCE); |
| |
| // All addresses in the constant pool are the same size as pointers. |
| static constexpr int kSpecialTargetSize = kPointerSize; |
| |
| // The sizes of the call sequences emitted by MacroAssembler::Call. |
| // Wherever possible, use MacroAssembler::CallSize instead of these constants, |
| // as it will choose the correct value for a given relocation mode. |
| // |
| // Without relocation: |
| // movz temp, #(target & 0x000000000000ffff) |
| // movk temp, #(target & 0x00000000ffff0000) |
| // movk temp, #(target & 0x0000ffff00000000) |
| // blr temp |
| // |
| // With relocation: |
| // ldr temp, =target |
| // blr temp |
| static constexpr int kCallSizeWithoutRelocation = 4 * kInstructionSize; |
| static constexpr int kCallSizeWithRelocation = 2 * kInstructionSize; |
| |
| // Size of the generated code in bytes |
| uint64_t SizeOfGeneratedCode() const { |
| DCHECK((pc_ >= buffer_) && (pc_ < (buffer_ + buffer_size_))); |
| return pc_ - buffer_; |
| } |
| |
| // Return the code size generated from label to the current position. |
| uint64_t SizeOfCodeGeneratedSince(const Label* label) { |
| DCHECK(label->is_bound()); |
| DCHECK(pc_offset() >= label->pos()); |
| DCHECK(pc_offset() < buffer_size_); |
| return pc_offset() - label->pos(); |
| } |
| |
| // Check the size of the code generated since the given label. This function |
| // is used primarily to work around comparisons between signed and unsigned |
| // quantities, since V8 uses both. |
| // TODO(jbramley): Work out what sign to use for these things and if possible, |
| // change things to be consistent. |
| void AssertSizeOfCodeGeneratedSince(const Label* label, ptrdiff_t size) { |
| DCHECK(size >= 0); |
| DCHECK(static_cast<uint64_t>(size) == SizeOfCodeGeneratedSince(label)); |
| } |
| |
| // Return the number of instructions generated from label to the |
| // current position. |
| uint64_t InstructionsGeneratedSince(const Label* label) { |
| return SizeOfCodeGeneratedSince(label) / kInstructionSize; |
| } |
| |
| static constexpr int kPatchDebugBreakSlotAddressOffset = 0; |
| |
| // Number of instructions necessary to be able to later patch it to a call. |
| static constexpr int kDebugBreakSlotInstructions = 5; |
| static constexpr int kDebugBreakSlotLength = |
| kDebugBreakSlotInstructions * kInstructionSize; |
| |
| // Prevent contant pool emission until EndBlockConstPool is called. |
| // Call to this function can be nested but must be followed by an equal |
| // number of call to EndBlockConstpool. |
| void StartBlockConstPool(); |
| |
| // Resume constant pool emission. Need to be called as many time as |
| // StartBlockConstPool to have an effect. |
| void EndBlockConstPool(); |
| |
| bool is_const_pool_blocked() const; |
| static bool IsConstantPoolAt(Instruction* instr); |
| static int ConstantPoolSizeAt(Instruction* instr); |
| // See Assembler::CheckConstPool for more info. |
| void EmitPoolGuard(); |
| |
| // Prevent veneer pool emission until EndBlockVeneerPool is called. |
| // Call to this function can be nested but must be followed by an equal |
| // number of call to EndBlockConstpool. |
| void StartBlockVeneerPool(); |
| |
| // Resume constant pool emission. Need to be called as many time as |
| // StartBlockVeneerPool to have an effect. |
| void EndBlockVeneerPool(); |
| |
| bool is_veneer_pool_blocked() const { |
| return veneer_pool_blocked_nesting_ > 0; |
| } |
| |
| // Block/resume emission of constant pools and veneer pools. |
| void StartBlockPools() { |
| StartBlockConstPool(); |
| StartBlockVeneerPool(); |
| } |
| void EndBlockPools() { |
| EndBlockConstPool(); |
| EndBlockVeneerPool(); |
| } |
| |
| // Debugging ---------------------------------------------------------------- |
| void RecordComment(const char* msg); |
| |
| // Record a deoptimization reason that can be used by a log or cpu profiler. |
| // Use --trace-deopt to enable. |
| void RecordDeoptReason(DeoptimizeReason reason, SourcePosition position, |
| int id); |
| |
| int buffer_space() const; |
| |
| // Mark address of a debug break slot. |
| void RecordDebugBreakSlot(RelocInfo::Mode mode); |
| |
| // Record the emission of a constant pool. |
| // |
| // The emission of constant and veneer pools depends on the size of the code |
| // generated and the number of RelocInfo recorded. |
| // The Debug mechanism needs to map code offsets between two versions of a |
| // function, compiled with and without debugger support (see for example |
| // Debug::PrepareForBreakPoints()). |
| // Compiling functions with debugger support generates additional code |
| // (DebugCodegen::GenerateSlot()). This may affect the emission of the pools |
| // and cause the version of the code with debugger support to have pools |
| // generated in different places. |
| // Recording the position and size of emitted pools allows to correctly |
| // compute the offset mappings between the different versions of a function in |
| // all situations. |
| // |
| // The parameter indicates the size of the pool (in bytes), including |
| // the marker and branch over the data. |
| void RecordConstPool(int size); |
| |
| |
| // Instruction set functions ------------------------------------------------ |
| |
| // Branch / Jump instructions. |
| // For branches offsets are scaled, i.e. they in instrcutions not in bytes. |
| // Branch to register. |
| void br(const Register& xn); |
| |
| // Branch-link to register. |
| void blr(const Register& xn); |
| |
| // Branch to register with return hint. |
| void ret(const Register& xn = lr); |
| |
| // Unconditional branch to label. |
| void b(Label* label); |
| |
| // Conditional branch to label. |
| void b(Label* label, Condition cond); |
| |
| // Unconditional branch to PC offset. |
| void b(int imm26); |
| |
| // Conditional branch to PC offset. |
| void b(int imm19, Condition cond); |
| |
| // Branch-link to label / pc offset. |
| void bl(Label* label); |
| void bl(int imm26); |
| |
| // Compare and branch to label / pc offset if zero. |
| void cbz(const Register& rt, Label* label); |
| void cbz(const Register& rt, int imm19); |
| |
| // Compare and branch to label / pc offset if not zero. |
| void cbnz(const Register& rt, Label* label); |
| void cbnz(const Register& rt, int imm19); |
| |
| // Test bit and branch to label / pc offset if zero. |
| void tbz(const Register& rt, unsigned bit_pos, Label* label); |
| void tbz(const Register& rt, unsigned bit_pos, int imm14); |
| |
| // Test bit and branch to label / pc offset if not zero. |
| void tbnz(const Register& rt, unsigned bit_pos, Label* label); |
| void tbnz(const Register& rt, unsigned bit_pos, int imm14); |
| |
| // Address calculation instructions. |
| // Calculate a PC-relative address. Unlike for branches the offset in adr is |
| // unscaled (i.e. the result can be unaligned). |
| void adr(const Register& rd, Label* label); |
| void adr(const Register& rd, int imm21); |
| |
| // Data Processing instructions. |
| // Add. |
| void add(const Register& rd, |
| const Register& rn, |
| const Operand& operand); |
| |
| // Add and update status flags. |
| void adds(const Register& rd, |
| const Register& rn, |
| const Operand& operand); |
| |
| // Compare negative. |
| void cmn(const Register& rn, const Operand& operand); |
| |
| // Subtract. |
| void sub(const Register& rd, |
| const Register& rn, |
| const Operand& operand); |
| |
| // Subtract and update status flags. |
| void subs(const Register& rd, |
| const Register& rn, |
| const Operand& operand); |
| |
| // Compare. |
| void cmp(const Register& rn, const Operand& operand); |
| |
| // Negate. |
| void neg(const Register& rd, |
| const Operand& operand); |
| |
| // Negate and update status flags. |
| void negs(const Register& rd, |
| const Operand& operand); |
| |
| // Add with carry bit. |
| void adc(const Register& rd, |
| const Register& rn, |
| const Operand& operand); |
| |
| // Add with carry bit and update status flags. |
| void adcs(const Register& rd, |
| const Register& rn, |
| const Operand& operand); |
| |
| // Subtract with carry bit. |
| void sbc(const Register& rd, |
| const Register& rn, |
| const Operand& operand); |
| |
| // Subtract with carry bit and update status flags. |
| void sbcs(const Register& rd, |
| const Register& rn, |
| const Operand& operand); |
| |
| // Negate with carry bit. |
| void ngc(const Register& rd, |
| const Operand& operand); |
| |
| // Negate with carry bit and update status flags. |
| void ngcs(const Register& rd, |
| const Operand& operand); |
| |
| // Logical instructions. |
| // Bitwise and (A & B). |
| void and_(const Register& rd, |
| const Register& rn, |
| const Operand& operand); |
| |
| // Bitwise and (A & B) and update status flags. |
| void ands(const Register& rd, |
| const Register& rn, |
| const Operand& operand); |
| |
| // Bit test, and set flags. |
| void tst(const Register& rn, const Operand& operand); |
| |
| // Bit clear (A & ~B). |
| void bic(const Register& rd, |
| const Register& rn, |
| const Operand& operand); |
| |
| // Bit clear (A & ~B) and update status flags. |
| void bics(const Register& rd, |
| const Register& rn, |
| const Operand& operand); |
| |
| // Bitwise or (A | B). |
| void orr(const Register& rd, const Register& rn, const Operand& operand); |
| |
| // Bitwise nor (A | ~B). |
| void orn(const Register& rd, const Register& rn, const Operand& operand); |
| |
| // Bitwise eor/xor (A ^ B). |
| void eor(const Register& rd, const Register& rn, const Operand& operand); |
| |
| // Bitwise enor/xnor (A ^ ~B). |
| void eon(const Register& rd, const Register& rn, const Operand& operand); |
| |
| // Logical shift left variable. |
| void lslv(const Register& rd, const Register& rn, const Register& rm); |
| |
| // Logical shift right variable. |
| void lsrv(const Register& rd, const Register& rn, const Register& rm); |
| |
| // Arithmetic shift right variable. |
| void asrv(const Register& rd, const Register& rn, const Register& rm); |
| |
| // Rotate right variable. |
| void rorv(const Register& rd, const Register& rn, const Register& rm); |
| |
| // Bitfield instructions. |
| // Bitfield move. |
| void bfm(const Register& rd, const Register& rn, int immr, int imms); |
| |
| // Signed bitfield move. |
| void sbfm(const Register& rd, const Register& rn, int immr, int imms); |
| |
| // Unsigned bitfield move. |
| void ubfm(const Register& rd, const Register& rn, int immr, int imms); |
| |
| // Bfm aliases. |
| // Bitfield insert. |
| void bfi(const Register& rd, const Register& rn, int lsb, int width) { |
| DCHECK(width >= 1); |
| DCHECK(lsb + width <= rn.SizeInBits()); |
| bfm(rd, rn, (rd.SizeInBits() - lsb) & (rd.SizeInBits() - 1), width - 1); |
| } |
| |
| // Bitfield extract and insert low. |
| void bfxil(const Register& rd, const Register& rn, int lsb, int width) { |
| DCHECK(width >= 1); |
| DCHECK(lsb + width <= rn.SizeInBits()); |
| bfm(rd, rn, lsb, lsb + width - 1); |
| } |
| |
| // Sbfm aliases. |
| // Arithmetic shift right. |
| void asr(const Register& rd, const Register& rn, int shift) { |
| DCHECK(shift < rd.SizeInBits()); |
| sbfm(rd, rn, shift, rd.SizeInBits() - 1); |
| } |
| |
| // Signed bitfield insert in zero. |
| void sbfiz(const Register& rd, const Register& rn, int lsb, int width) { |
| DCHECK(width >= 1); |
| DCHECK(lsb + width <= rn.SizeInBits()); |
| sbfm(rd, rn, (rd.SizeInBits() - lsb) & (rd.SizeInBits() - 1), width - 1); |
| } |
| |
| // Signed bitfield extract. |
| void sbfx(const Register& rd, const Register& rn, int lsb, int width) { |
| DCHECK(width >= 1); |
| DCHECK(lsb + width <= rn.SizeInBits()); |
| sbfm(rd, rn, lsb, lsb + width - 1); |
| } |
| |
| // Signed extend byte. |
| void sxtb(const Register& rd, const Register& rn) { |
| sbfm(rd, rn, 0, 7); |
| } |
| |
| // Signed extend halfword. |
| void sxth(const Register& rd, const Register& rn) { |
| sbfm(rd, rn, 0, 15); |
| } |
| |
| // Signed extend word. |
| void sxtw(const Register& rd, const Register& rn) { |
| sbfm(rd, rn, 0, 31); |
| } |
| |
| // Ubfm aliases. |
| // Logical shift left. |
| void lsl(const Register& rd, const Register& rn, int shift) { |
| int reg_size = rd.SizeInBits(); |
| DCHECK(shift < reg_size); |
| ubfm(rd, rn, (reg_size - shift) % reg_size, reg_size - shift - 1); |
| } |
| |
| // Logical shift right. |
| void lsr(const Register& rd, const Register& rn, int shift) { |
| DCHECK(shift < rd.SizeInBits()); |
| ubfm(rd, rn, shift, rd.SizeInBits() - 1); |
| } |
| |
| // Unsigned bitfield insert in zero. |
| void ubfiz(const Register& rd, const Register& rn, int lsb, int width) { |
| DCHECK(width >= 1); |
| DCHECK(lsb + width <= rn.SizeInBits()); |
| ubfm(rd, rn, (rd.SizeInBits() - lsb) & (rd.SizeInBits() - 1), width - 1); |
| } |
| |
| // Unsigned bitfield extract. |
| void ubfx(const Register& rd, const Register& rn, int lsb, int width) { |
| DCHECK(width >= 1); |
| DCHECK(lsb + width <= rn.SizeInBits()); |
| ubfm(rd, rn, lsb, lsb + width - 1); |
| } |
| |
| // Unsigned extend byte. |
| void uxtb(const Register& rd, const Register& rn) { |
| ubfm(rd, rn, 0, 7); |
| } |
| |
| // Unsigned extend halfword. |
| void uxth(const Register& rd, const Register& rn) { |
| ubfm(rd, rn, 0, 15); |
| } |
| |
| // Unsigned extend word. |
| void uxtw(const Register& rd, const Register& rn) { |
| ubfm(rd, rn, 0, 31); |
| } |
| |
| // Extract. |
| void extr(const Register& rd, const Register& rn, const Register& rm, |
| int lsb); |
| |
| // Conditional select: rd = cond ? rn : rm. |
| void csel(const Register& rd, |
| const Register& rn, |
| const Register& rm, |
| Condition cond); |
| |
| // Conditional select increment: rd = cond ? rn : rm + 1. |
| void csinc(const Register& rd, |
| const Register& rn, |
| const Register& rm, |
| Condition cond); |
| |
| // Conditional select inversion: rd = cond ? rn : ~rm. |
| void csinv(const Register& rd, |
| const Register& rn, |
| const Register& rm, |
| Condition cond); |
| |
| // Conditional select negation: rd = cond ? rn : -rm. |
| void csneg(const Register& rd, |
| const Register& rn, |
| const Register& rm, |
| Condition cond); |
| |
| // Conditional set: rd = cond ? 1 : 0. |
| void cset(const Register& rd, Condition cond); |
| |
| // Conditional set minus: rd = cond ? -1 : 0. |
| void csetm(const Register& rd, Condition cond); |
| |
| // Conditional increment: rd = cond ? rn + 1 : rn. |
| void cinc(const Register& rd, const Register& rn, Condition cond); |
| |
| // Conditional invert: rd = cond ? ~rn : rn. |
| void cinv(const Register& rd, const Register& rn, Condition cond); |
| |
| // Conditional negate: rd = cond ? -rn : rn. |
| void cneg(const Register& rd, const Register& rn, Condition cond); |
| |
| // Extr aliases. |
| void ror(const Register& rd, const Register& rs, unsigned shift) { |
| extr(rd, rs, rs, shift); |
| } |
| |
| // Conditional comparison. |
| // Conditional compare negative. |
| void ccmn(const Register& rn, |
| const Operand& operand, |
| StatusFlags nzcv, |
| Condition cond); |
| |
| // Conditional compare. |
| void ccmp(const Register& rn, |
| const Operand& operand, |
| StatusFlags nzcv, |
| Condition cond); |
| |
| // Multiplication. |
| // 32 x 32 -> 32-bit and 64 x 64 -> 64-bit multiply. |
| void mul(const Register& rd, const Register& rn, const Register& rm); |
| |
| // 32 + 32 x 32 -> 32-bit and 64 + 64 x 64 -> 64-bit multiply accumulate. |
| void madd(const Register& rd, |
| const Register& rn, |
| const Register& rm, |
| const Register& ra); |
| |
| // -(32 x 32) -> 32-bit and -(64 x 64) -> 64-bit multiply. |
| void mneg(const Register& rd, const Register& rn, const Register& rm); |
| |
| // 32 - 32 x 32 -> 32-bit and 64 - 64 x 64 -> 64-bit multiply subtract. |
| void msub(const Register& rd, |
| const Register& rn, |
| const Register& rm, |
| const Register& ra); |
| |
| // 32 x 32 -> 64-bit multiply. |
| void smull(const Register& rd, const Register& rn, const Register& rm); |
| |
| // Xd = bits<127:64> of Xn * Xm. |
| void smulh(const Register& rd, const Register& rn, const Register& rm); |
| |
| // Signed 32 x 32 -> 64-bit multiply and accumulate. |
| void smaddl(const Register& rd, |
| const Register& rn, |
| const Register& rm, |
| const Register& ra); |
| |
| // Unsigned 32 x 32 -> 64-bit multiply and accumulate. |
| void umaddl(const Register& rd, |
| const Register& rn, |
| const Register& rm, |
| const Register& ra); |
| |
| // Signed 32 x 32 -> 64-bit multiply and subtract. |
| void smsubl(const Register& rd, |
| const Register& rn, |
| const Register& rm, |
| const Register& ra); |
| |
| // Unsigned 32 x 32 -> 64-bit multiply and subtract. |
| void umsubl(const Register& rd, |
| const Register& rn, |
| const Register& rm, |
| const Register& ra); |
| |
| // Signed integer divide. |
| void sdiv(const Register& rd, const Register& rn, const Register& rm); |
| |
| // Unsigned integer divide. |
| void udiv(const Register& rd, const Register& rn, const Register& rm); |
| |
| // Bit count, bit reverse and endian reverse. |
| void rbit(const Register& rd, const Register& rn); |
| void rev16(const Register& rd, const Register& rn); |
| void rev32(const Register& rd, const Register& rn); |
| void rev(const Register& rd, const Register& rn); |
| void clz(const Register& rd, const Register& rn); |
| void cls(const Register& rd, const Register& rn); |
| |
| // Memory instructions. |
| |
| // Load integer or FP register. |
| void ldr(const CPURegister& rt, const MemOperand& src); |
| |
| // Store integer or FP register. |
| void str(const CPURegister& rt, const MemOperand& dst); |
| |
| // Load word with sign extension. |
| void ldrsw(const Register& rt, const MemOperand& src); |
| |
| // Load byte. |
| void ldrb(const Register& rt, const MemOperand& src); |
| |
| // Store byte. |
| void strb(const Register& rt, const MemOperand& dst); |
| |
| // Load byte with sign extension. |
| void ldrsb(const Register& rt, const MemOperand& src); |
| |
| // Load half-word. |
| void ldrh(const Register& rt, const MemOperand& src); |
| |
| // Store half-word. |
| void strh(const Register& rt, const MemOperand& dst); |
| |
| // Load half-word with sign extension. |
| void ldrsh(const Register& rt, const MemOperand& src); |
| |
| // Load integer or FP register pair. |
| void ldp(const CPURegister& rt, const CPURegister& rt2, |
| const MemOperand& src); |
| |
| // Store integer or FP register pair. |
| void stp(const CPURegister& rt, const CPURegister& rt2, |
| const MemOperand& dst); |
| |
| // Load word pair with sign extension. |
| void ldpsw(const Register& rt, const Register& rt2, const MemOperand& src); |
| |
| // Load literal to register from a pc relative address. |
| void ldr_pcrel(const CPURegister& rt, int imm19); |
| |
| // Load literal to register. |
| void ldr(const CPURegister& rt, const Immediate& imm); |
| |
| // Load-acquire word. |
| void ldar(const Register& rt, const Register& rn); |
| |
| // Load-acquire exclusive word. |
| void ldaxr(const Register& rt, const Register& rn); |
| |
| // Store-release word. |
| void stlr(const Register& rt, const Register& rn); |
| |
| // Store-release exclusive word. |
| void stlxr(const Register& rs, const Register& rt, const Register& rn); |
| |
| // Load-acquire byte. |
| void ldarb(const Register& rt, const Register& rn); |
| |
| // Load-acquire exclusive byte. |
| void ldaxrb(const Register& rt, const Register& rn); |
| |
| // Store-release byte. |
| void stlrb(const Register& rt, const Register& rn); |
| |
| // Store-release exclusive byte. |
| void stlxrb(const Register& rs, const Register& rt, const Register& rn); |
| |
| // Load-acquire half-word. |
| void ldarh(const Register& rt, const Register& rn); |
| |
| // Load-acquire exclusive half-word. |
| void ldaxrh(const Register& rt, const Register& rn); |
| |
| // Store-release half-word. |
| void stlrh(const Register& rt, const Register& rn); |
| |
| // Store-release exclusive half-word. |
| void stlxrh(const Register& rs, const Register& rt, const Register& rn); |
| |
| // Move instructions. The default shift of -1 indicates that the move |
| // instruction will calculate an appropriate 16-bit immediate and left shift |
| // that is equal to the 64-bit immediate argument. If an explicit left shift |
| // is specified (0, 16, 32 or 48), the immediate must be a 16-bit value. |
| // |
| // For movk, an explicit shift can be used to indicate which half word should |
| // be overwritten, eg. movk(x0, 0, 0) will overwrite the least-significant |
| // half word with zero, whereas movk(x0, 0, 48) will overwrite the |
| // most-significant. |
| |
| // Move and keep. |
| void movk(const Register& rd, uint64_t imm, int shift = -1) { |
| MoveWide(rd, imm, shift, MOVK); |
| } |
| |
| // Move with non-zero. |
| void movn(const Register& rd, uint64_t imm, int shift = -1) { |
| MoveWide(rd, imm, shift, MOVN); |
| } |
| |
| // Move with zero. |
| void movz(const Register& rd, uint64_t imm, int shift = -1) { |
| MoveWide(rd, imm, shift, MOVZ); |
| } |
| |
| // Misc instructions. |
| // Monitor debug-mode breakpoint. |
| void brk(int code); |
| |
| // Halting debug-mode breakpoint. |
| void hlt(int code); |
| |
| // Move register to register. |
| void mov(const Register& rd, const Register& rn); |
| |
| // Move NOT(operand) to register. |
| void mvn(const Register& rd, const Operand& operand); |
| |
| // System instructions. |
| // Move to register from system register. |
| void mrs(const Register& rt, SystemRegister sysreg); |
| |
| // Move from register to system register. |
| void msr(SystemRegister sysreg, const Register& rt); |
| |
| // System hint. |
| void hint(SystemHint code); |
| |
| // Data memory barrier |
| void dmb(BarrierDomain domain, BarrierType type); |
| |
| // Data synchronization barrier |
| void dsb(BarrierDomain domain, BarrierType type); |
| |
| // Instruction synchronization barrier |
| void isb(); |
| |
| // Alias for system instructions. |
| void nop() { hint(NOP); } |
| |
| // Different nop operations are used by the code generator to detect certain |
| // states of the generated code. |
| enum NopMarkerTypes { |
| DEBUG_BREAK_NOP, |
| INTERRUPT_CODE_NOP, |
| ADR_FAR_NOP, |
| FIRST_NOP_MARKER = DEBUG_BREAK_NOP, |
| LAST_NOP_MARKER = ADR_FAR_NOP |
| }; |
| |
| void nop(NopMarkerTypes n) { |
| DCHECK((FIRST_NOP_MARKER <= n) && (n <= LAST_NOP_MARKER)); |
| mov(Register::XRegFromCode(n), Register::XRegFromCode(n)); |
| } |
| |
| // FP instructions. |
| // Move immediate to FP register. |
| void fmov(FPRegister fd, double imm); |
| void fmov(FPRegister fd, float imm); |
| |
| // Move FP register to register. |
| void fmov(Register rd, FPRegister fn); |
| |
| // Move register to FP register. |
| void fmov(FPRegister fd, Register rn); |
| |
| // Move FP register to FP register. |
| void fmov(FPRegister fd, FPRegister fn); |
| |
| // FP add. |
| void fadd(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| |
| // FP subtract. |
| void fsub(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| |
| // FP multiply. |
| void fmul(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| |
| // FP fused multiply and add. |
| void fmadd(const FPRegister& fd, |
| const FPRegister& fn, |
| const FPRegister& fm, |
| const FPRegister& fa); |
| |
| // FP fused multiply and subtract. |
| void fmsub(const FPRegister& fd, |
| const FPRegister& fn, |
| const FPRegister& fm, |
| const FPRegister& fa); |
| |
| // FP fused multiply, add and negate. |
| void fnmadd(const FPRegister& fd, |
| const FPRegister& fn, |
| const FPRegister& fm, |
| const FPRegister& fa); |
| |
| // FP fused multiply, subtract and negate. |
| void fnmsub(const FPRegister& fd, |
| const FPRegister& fn, |
| const FPRegister& fm, |
| const FPRegister& fa); |
| |
| // FP divide. |
| void fdiv(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| |
| // FP maximum. |
| void fmax(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| |
| // FP minimum. |
| void fmin(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| |
| // FP maximum. |
| void fmaxnm(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| |
| // FP minimum. |
| void fminnm(const FPRegister& fd, const FPRegister& fn, const FPRegister& fm); |
| |
| // FP absolute. |
| void fabs(const FPRegister& fd, const FPRegister& fn); |
| |
| // FP negate. |
| void fneg(const FPRegister& fd, const FPRegister& fn); |
| |
| // FP square root. |
| void fsqrt(const FPRegister& fd, const FPRegister& fn); |
| |
| // FP round to integer (nearest with ties to away). |
| void frinta(const FPRegister& fd, const FPRegister& fn); |
| |
| // FP round to integer (toward minus infinity). |
| void frintm(const FPRegister& fd, const FPRegister& fn); |
| |
| // FP round to integer (nearest with ties to even). |
| void frintn(const FPRegister& fd, const FPRegister& fn); |
| |
| // FP round to integer (towards plus infinity). |
| void frintp(const FPRegister& fd, const FPRegister& fn); |
| |
| // FP round to integer (towards zero.) |
| void frintz(const FPRegister& fd, const FPRegister& fn); |
| |
| // FP compare registers. |
| void fcmp(const FPRegister& fn, const FPRegister& fm); |
| |
| // FP compare immediate. |
| void fcmp(const FPRegister& fn, double value); |
| |
| // FP conditional compare. |
| void fccmp(const FPRegister& fn, |
| const FPRegister& fm, |
| StatusFlags nzcv, |
| Condition cond); |
| |
| // FP conditional select. |
| void fcsel(const FPRegister& fd, |
| const FPRegister& fn, |
| const FPRegister& fm, |
| Condition cond); |
| |
| // Common FP Convert function |
| void FPConvertToInt(const Register& rd, |
| const FPRegister& fn, |
| FPIntegerConvertOp op); |
| |
| // FP convert between single and double precision. |
| void fcvt(const FPRegister& fd, const FPRegister& fn); |
| |
| // Convert FP to unsigned integer (nearest with ties to away). |
| void fcvtau(const Register& rd, const FPRegister& fn); |
| |
| // Convert FP to signed integer (nearest with ties to away). |
| void fcvtas(const Register& rd, const FPRegister& fn); |
| |
| // Convert FP to unsigned integer (round towards -infinity). |
| void fcvtmu(const Register& rd, const FPRegister& fn); |
| |
| // Convert FP to signed integer (round towards -infinity). |
| void fcvtms(const Register& rd, const FPRegister& fn); |
| |
| // Convert FP to unsigned integer (nearest with ties to even). |
| void fcvtnu(const Register& rd, const FPRegister& fn); |
| |
| // Convert FP to signed integer (nearest with ties to even). |
| void fcvtns(const Register& rd, const FPRegister& fn); |
| |
| // Convert FP to unsigned integer (round towards zero). |
| void fcvtzu(const Register& rd, const FPRegister& fn); |
| |
| // Convert FP to signed integer (rounf towards zero). |
| void fcvtzs(const Register& rd, const FPRegister& fn); |
| |
| // Convert signed integer or fixed point to FP. |
| void scvtf(const FPRegister& fd, const Register& rn, unsigned fbits = 0); |
| |
| // Convert unsigned integer or fixed point to FP. |
| void ucvtf(const FPRegister& fd, const Register& rn, unsigned fbits = 0); |
| |
| // Instruction functions used only for test, debug, and patching. |
| // Emit raw instructions in the instruction stream. |
| void dci(Instr raw_inst) { Emit(raw_inst); } |
| |
| // Emit 8 bits of data in the instruction stream. |
| void dc8(uint8_t data) { EmitData(&data, sizeof(data)); } |
| |
| // Emit 32 bits of data in the instruction stream. |
| void dc32(uint32_t data) { EmitData(&data, sizeof(data)); } |
| |
| // Emit 64 bits of data in the instruction stream. |
| void dc64(uint64_t data) { EmitData(&data, sizeof(data)); } |
| |
| // Emit an address in the instruction stream. |
| void dcptr(Label* label); |
| |
| // Copy a string into the instruction stream, including the terminating NULL |
| // character. The instruction pointer (pc_) is then aligned correctly for |
| // subsequent instructions. |
| void EmitStringData(const char* string); |
| |
| // Pseudo-instructions ------------------------------------------------------ |
| |
| // Parameters are described in arm64/instructions-arm64.h. |
| void debug(const char* message, uint32_t code, Instr params = BREAK); |
| |
| // Required by V8. |
| void dd(uint32_t data) { dc32(data); } |
| void db(uint8_t data) { dc8(data); } |
| void dq(uint64_t data) { dc64(data); } |
| void dp(uintptr_t data) { dc64(data); } |
| |
| // Code generation helpers -------------------------------------------------- |
| |
| bool IsConstPoolEmpty() const { return constpool_.IsEmpty(); } |
| |
| Instruction* pc() const { return Instruction::Cast(pc_); } |
| |
| Instruction* InstructionAt(ptrdiff_t offset) const { |
| return reinterpret_cast<Instruction*>(buffer_ + offset); |
| } |
| |
| ptrdiff_t InstructionOffset(Instruction* instr) const { |
| return reinterpret_cast<byte*>(instr) - buffer_; |
| } |
| |
| // Register encoding. |
| static Instr Rd(CPURegister rd) { |
| DCHECK(rd.code() != kSPRegInternalCode); |
| return rd.code() << Rd_offset; |
| } |
| |
| static Instr Rn(CPURegister rn) { |
| DCHECK(rn.code() != kSPRegInternalCode); |
| return rn.code() << Rn_offset; |
| } |
| |
| static Instr Rm(CPURegister rm) { |
| DCHECK(rm.code() != kSPRegInternalCode); |
| return rm.code() << Rm_offset; |
| } |
| |
| static Instr Ra(CPURegister ra) { |
| DCHECK(ra.code() != kSPRegInternalCode); |
| return ra.code() << Ra_offset; |
| } |
| |
| static Instr Rt(CPURegister rt) { |
| DCHECK(rt.code() != kSPRegInternalCode); |
| return rt.code() << Rt_offset; |
| } |
| |
| static Instr Rt2(CPURegister rt2) { |
| DCHECK(rt2.code() != kSPRegInternalCode); |
| return rt2.code() << Rt2_offset; |
| } |
| |
| static Instr Rs(CPURegister rs) { |
| DCHECK(rs.code() != kSPRegInternalCode); |
| return rs.code() << Rs_offset; |
| } |
| |
| // These encoding functions allow the stack pointer to be encoded, and |
| // disallow the zero register. |
| static Instr RdSP(Register rd) { |
| DCHECK(!rd.IsZero()); |
| return (rd.code() & kRegCodeMask) << Rd_offset; |
| } |
| |
| static Instr RnSP(Register rn) { |
| DCHECK(!rn.IsZero()); |
| return (rn.code() & kRegCodeMask) << Rn_offset; |
| } |
| |
| // Flags encoding. |
| inline static Instr Flags(FlagsUpdate S); |
| inline static Instr Cond(Condition cond); |
| |
| // PC-relative address encoding. |
| inline static Instr ImmPCRelAddress(int imm21); |
| |
| // Branch encoding. |
| inline static Instr ImmUncondBranch(int imm26); |
| inline static Instr ImmCondBranch(int imm19); |
| inline static Instr ImmCmpBranch(int imm19); |
| inline static Instr ImmTestBranch(int imm14); |
| inline static Instr ImmTestBranchBit(unsigned bit_pos); |
| |
| // Data Processing encoding. |
| inline static Instr SF(Register rd); |
| inline static Instr ImmAddSub(int imm); |
| inline static Instr ImmS(unsigned imms, unsigned reg_size); |
| inline static Instr ImmR(unsigned immr, unsigned reg_size); |
| inline static Instr ImmSetBits(unsigned imms, unsigned reg_size); |
| inline static Instr ImmRotate(unsigned immr, unsigned reg_size); |
| inline static Instr ImmLLiteral(int imm19); |
| inline static Instr BitN(unsigned bitn, unsigned reg_size); |
| inline static Instr ShiftDP(Shift shift); |
| inline static Instr ImmDPShift(unsigned amount); |
| inline static Instr ExtendMode(Extend extend); |
| inline static Instr ImmExtendShift(unsigned left_shift); |
| inline static Instr ImmCondCmp(unsigned imm); |
| inline static Instr Nzcv(StatusFlags nzcv); |
| |
| static bool IsImmAddSub(int64_t immediate); |
| static bool IsImmLogical(uint64_t value, |
| unsigned width, |
| unsigned* n, |
| unsigned* imm_s, |
| unsigned* imm_r); |
| |
| // MemOperand offset encoding. |
| inline static Instr ImmLSUnsigned(int imm12); |
| inline static Instr ImmLS(int imm9); |
| inline static Instr ImmLSPair(int imm7, LSDataSize size); |
| inline static Instr ImmShiftLS(unsigned shift_amount); |
| inline static Instr ImmException(int imm16); |
| inline static Instr ImmSystemRegister(int imm15); |
| inline static Instr ImmHint(int imm7); |
| inline static Instr ImmBarrierDomain(int imm2); |
| inline static Instr ImmBarrierType(int imm2); |
| inline static LSDataSize CalcLSDataSize(LoadStoreOp op); |
| |
| static bool IsImmLSUnscaled(int64_t offset); |
| static bool IsImmLSScaled(int64_t offset, LSDataSize size); |
| static bool IsImmLLiteral(int64_t offset); |
| |
| // Move immediates encoding. |
| inline static Instr ImmMoveWide(int imm); |
| inline static Instr ShiftMoveWide(int shift); |
| |
| // FP Immediates. |
| static Instr ImmFP32(float imm); |
| static Instr ImmFP64(double imm); |
| inline static Instr FPScale(unsigned scale); |
| |
| // FP register type. |
| inline static Instr FPType(FPRegister fd); |
| |
| // Class for scoping postponing the constant pool generation. |
| class BlockConstPoolScope { |
| public: |
| explicit BlockConstPoolScope(Assembler* assem) : assem_(assem) { |
| assem_->StartBlockConstPool(); |
| } |
| ~BlockConstPoolScope() { |
| assem_->EndBlockConstPool(); |
| } |
| |
| private: |
| Assembler* assem_; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(BlockConstPoolScope); |
| }; |
| |
| // Check if is time to emit a constant pool. |
| void CheckConstPool(bool force_emit, bool require_jump); |
| |
| void PatchConstantPoolAccessInstruction(int pc_offset, int offset, |
| ConstantPoolEntry::Access access, |
| ConstantPoolEntry::Type type) { |
| // No embedded constant pool support. |
| UNREACHABLE(); |
| } |
| |
| // Returns true if we should emit a veneer as soon as possible for a branch |
| // which can at most reach to specified pc. |
| bool ShouldEmitVeneer(int max_reachable_pc, |
| int margin = kVeneerDistanceMargin); |
| bool ShouldEmitVeneers(int margin = kVeneerDistanceMargin) { |
| return ShouldEmitVeneer(unresolved_branches_first_limit(), margin); |
| } |
| |
| // The maximum code size generated for a veneer. Currently one branch |
| // instruction. This is for code size checking purposes, and can be extended |
| // in the future for example if we decide to add nops between the veneers. |
| static constexpr int kMaxVeneerCodeSize = 1 * kInstructionSize; |
| |
| void RecordVeneerPool(int location_offset, int size); |
| // Emits veneers for branches that are approaching their maximum range. |
| // If need_protection is true, the veneers are protected by a branch jumping |
| // over the code. |
| void EmitVeneers(bool force_emit, bool need_protection, |
| int margin = kVeneerDistanceMargin); |
| void EmitVeneersGuard() { EmitPoolGuard(); } |
| // Checks whether veneers need to be emitted at this point. |
| // If force_emit is set, a veneer is generated for *all* unresolved branches. |
| void CheckVeneerPool(bool force_emit, bool require_jump, |
| int margin = kVeneerDistanceMargin); |
| |
| class BlockPoolsScope { |
| public: |
| explicit BlockPoolsScope(Assembler* assem) : assem_(assem) { |
| assem_->StartBlockPools(); |
| } |
| ~BlockPoolsScope() { |
| assem_->EndBlockPools(); |
| } |
| |
| private: |
| Assembler* assem_; |
| |
| DISALLOW_IMPLICIT_CONSTRUCTORS(BlockPoolsScope); |
| }; |
| |
| protected: |
| inline const Register& AppropriateZeroRegFor(const CPURegister& reg) const; |
| |
| void LoadStore(const CPURegister& rt, |
| const MemOperand& addr, |
| LoadStoreOp op); |
| |
| void LoadStorePair(const CPURegister& rt, const CPURegister& rt2, |
| const MemOperand& addr, LoadStorePairOp op); |
| static bool IsImmLSPair(int64_t offset, LSDataSize size); |
| |
| void Logical(const Register& rd, |
| const Register& rn, |
| const Operand& operand, |
| LogicalOp op); |
| void LogicalImmediate(const Register& rd, |
| const Register& rn, |
| unsigned n, |
| unsigned imm_s, |
| unsigned imm_r, |
| LogicalOp op); |
| |
| void ConditionalCompare(const Register& rn, |
| const Operand& operand, |
| StatusFlags nzcv, |
| Condition cond, |
| ConditionalCompareOp op); |
| static bool IsImmConditionalCompare(int64_t immediate); |
| |
| void AddSubWithCarry(const Register& rd, |
| const Register& rn, |
| const Operand& operand, |
| FlagsUpdate S, |
| AddSubWithCarryOp op); |
| |
| // Functions for emulating operands not directly supported by the instruction |
| // set. |
| void EmitShift(const Register& rd, |
| const Register& rn, |
| Shift shift, |
| unsigned amount); |
| void EmitExtendShift(const Register& rd, |
| const Register& rn, |
| Extend extend, |
| unsigned left_shift); |
| |
| void AddSub(const Register& rd, |
| const Register& rn, |
| const Operand& operand, |
| FlagsUpdate S, |
| AddSubOp op); |
| |
| static bool IsImmFP32(float imm); |
| static bool IsImmFP64(double imm); |
| |
| // Find an appropriate LoadStoreOp or LoadStorePairOp for the specified |
| // registers. Only simple loads are supported; sign- and zero-extension (such |
| // as in LDPSW_x or LDRB_w) are not supported. |
| static inline LoadStoreOp LoadOpFor(const CPURegister& rt); |
| static inline LoadStorePairOp LoadPairOpFor(const CPURegister& rt, |
| const CPURegister& rt2); |
| static inline LoadStoreOp StoreOpFor(const CPURegister& rt); |
| static inline LoadStorePairOp StorePairOpFor(const CPURegister& rt, |
| const CPURegister& rt2); |
| static inline LoadLiteralOp LoadLiteralOpFor(const CPURegister& rt); |
| |
| // Remove the specified branch from the unbound label link chain. |
| // If available, a veneer for this label can be used for other branches in the |
| // chain if the link chain cannot be fixed up without this branch. |
| void RemoveBranchFromLabelLinkChain(Instruction* branch, |
| Label* label, |
| Instruction* label_veneer = NULL); |
| |
| private: |
| // Instruction helpers. |
| void MoveWide(const Register& rd, |
| uint64_t imm, |
| int shift, |
| MoveWideImmediateOp mov_op); |
| void DataProcShiftedRegister(const Register& rd, |
| const Register& rn, |
| const Operand& operand, |
| FlagsUpdate S, |
| Instr op); |
| void DataProcExtendedRegister(const Register& rd, |
| const Register& rn, |
| const Operand& operand, |
| FlagsUpdate S, |
| Instr op); |
| void ConditionalSelect(const Register& rd, |
| const Register& rn, |
| const Register& rm, |
| Condition cond, |
| ConditionalSelectOp op); |
| void DataProcessing1Source(const Register& rd, |
| const Register& rn, |
| DataProcessing1SourceOp op); |
| void DataProcessing3Source(const Register& rd, |
| const Register& rn, |
| const Register& rm, |
| const Register& ra, |
| DataProcessing3SourceOp op); |
| void FPDataProcessing1Source(const FPRegister& fd, |
| const FPRegister& fn, |
| FPDataProcessing1SourceOp op); |
| void FPDataProcessing2Source(const FPRegister& fd, |
| const FPRegister& fn, |
| const FPRegister& fm, |
| FPDataProcessing2SourceOp op); |
| void FPDataProcessing3Source(const FPRegister& fd, |
| const FPRegister& fn, |
| const FPRegister& fm, |
| const FPRegister& fa, |
| FPDataProcessing3SourceOp op); |
| |
| // Label helpers. |
| |
| // Return an offset for a label-referencing instruction, typically a branch. |
| int LinkAndGetByteOffsetTo(Label* label); |
| |
| // This is the same as LinkAndGetByteOffsetTo, but return an offset |
| // suitable for fields that take instruction offsets. |
| inline int LinkAndGetInstructionOffsetTo(Label* label); |
| |
| static constexpr int kStartOfLabelLinkChain = 0; |
| |
| // Verify that a label's link chain is intact. |
| void CheckLabelLinkChain(Label const * label); |
| |
| void RecordLiteral(int64_t imm, unsigned size); |
| |
| // Postpone the generation of the constant pool for the specified number of |
| // instructions. |
| void BlockConstPoolFor(int instructions); |
| |
| // Set how far from current pc the next constant pool check will be. |
| void SetNextConstPoolCheckIn(int instructions) { |
| next_constant_pool_check_ = pc_offset() + instructions * kInstructionSize; |
| } |
| |
| // Emit the instruction at pc_. |
| void Emit(Instr instruction) { |
| STATIC_ASSERT(sizeof(*pc_) == 1); |
| STATIC_ASSERT(sizeof(instruction) == kInstructionSize); |
| DCHECK((pc_ + sizeof(instruction)) <= (buffer_ + buffer_size_)); |
| |
| memcpy(pc_, &instruction, sizeof(instruction)); |
| pc_ += sizeof(instruction); |
| CheckBuffer(); |
| } |
| |
| // Emit data inline in the instruction stream. |
| void EmitData(void const * data, unsigned size) { |
| DCHECK(sizeof(*pc_) == 1); |
| DCHECK((pc_ + size) <= (buffer_ + buffer_size_)); |
| |
| // TODO(all): Somehow register we have some data here. Then we can |
| // disassemble it correctly. |
| memcpy(pc_, data, size); |
| pc_ += size; |
| CheckBuffer(); |
| } |
| |
| void GrowBuffer(); |
| void CheckBufferSpace(); |
| void CheckBuffer(); |
| |
| // Pc offset of the next constant pool check. |
| int next_constant_pool_check_; |
| |
| // Constant pool generation |
| // Pools are emitted in the instruction stream. They are emitted when: |
| // * the distance to the first use is above a pre-defined distance or |
| // * the numbers of entries in the pool is above a pre-defined size or |
| // * code generation is finished |
| // If a pool needs to be emitted before code generation is finished a branch |
| // over the emitted pool will be inserted. |
| |
| // Constants in the pool may be addresses of functions that gets relocated; |
| // if so, a relocation info entry is associated to the constant pool entry. |
| |
| // Repeated checking whether the constant pool should be emitted is rather |
| // expensive. By default we only check again once a number of instructions |
| // has been generated. That also means that the sizing of the buffers is not |
| // an exact science, and that we rely on some slop to not overrun buffers. |
| static constexpr int kCheckConstPoolInterval = 128; |
| |
| // Distance to first use after a which a pool will be emitted. Pool entries |
| // are accessed with pc relative load therefore this cannot be more than |
| // 1 * MB. Since constant pool emission checks are interval based this value |
| // is an approximation. |
| static constexpr int kApproxMaxDistToConstPool = 64 * KB; |
| |
| // Number of pool entries after which a pool will be emitted. Since constant |
| // pool emission checks are interval based this value is an approximation. |
| static constexpr int kApproxMaxPoolEntryCount = 512; |
| |
| // Emission of the constant pool may be blocked in some code sequences. |
| int const_pool_blocked_nesting_; // Block emission if this is not zero. |
| int no_const_pool_before_; // Block emission before this pc offset. |
| |
| // Emission of the veneer pools may be blocked in some code sequences. |
| int veneer_pool_blocked_nesting_; // Block emission if this is not zero. |
| |
| // Relocation info generation |
| // Each relocation is encoded as a variable size value |
| static constexpr int kMaxRelocSize = RelocInfoWriter::kMaxSize; |
| RelocInfoWriter reloc_info_writer; |
| |
| // Internal reference positions, required for (potential) patching in |
| // GrowBuffer(); contains only those internal references whose labels |
| // are already bound. |
| std::deque<int> internal_reference_positions_; |
| |
| // Relocation info records are also used during code generation as temporary |
| // containers for constants and code target addresses until they are emitted |
| // to the constant pool. These pending relocation info records are temporarily |
| // stored in a separate buffer until a constant pool is emitted. |
| // If every instruction in a long sequence is accessing the pool, we need one |
| // pending relocation entry per instruction. |
| |
| // The pending constant pool. |
| ConstPool constpool_; |
| |
| // Relocation for a type-recording IC has the AST id added to it. This |
| // member variable is a way to pass the information from the call site to |
| // the relocation info. |
| TypeFeedbackId recorded_ast_id_; |
| |
| inline TypeFeedbackId RecordedAstId(); |
| inline void ClearRecordedAstId(); |
| |
| protected: |
| // Record the AST id of the CallIC being compiled, so that it can be placed |
| // in the relocation information. |
| void SetRecordedAstId(TypeFeedbackId ast_id) { |
| DCHECK(recorded_ast_id_.IsNone()); |
| recorded_ast_id_ = ast_id; |
| } |
| |
| // Code generation |
| // The relocation writer's position is at least kGap bytes below the end of |
| // the generated instructions. This is so that multi-instruction sequences do |
| // not have to check for overflow. The same is true for writes of large |
| // relocation info entries, and debug strings encoded in the instruction |
| // stream. |
| static constexpr int kGap = 128; |
| |
| public: |
| class FarBranchInfo { |
| public: |
| FarBranchInfo(int offset, Label* label) |
| : pc_offset_(offset), label_(label) {} |
| // Offset of the branch in the code generation buffer. |
| int pc_offset_; |
| // The label branched to. |
| Label* label_; |
| }; |
| |
| protected: |
| // Information about unresolved (forward) branches. |
| // The Assembler is only allowed to delete out-of-date information from here |
| // after a label is bound. The MacroAssembler uses this information to |
| // generate veneers. |
| // |
| // The second member gives information about the unresolved branch. The first |
| // member of the pair is the maximum offset that the branch can reach in the |
| // buffer. The map is sorted according to this reachable offset, allowing to |
| // easily check when veneers need to be emitted. |
| // Note that the maximum reachable offset (first member of the pairs) should |
| // always be positive but has the same type as the return value for |
| // pc_offset() for convenience. |
| std::multimap<int, FarBranchInfo> unresolved_branches_; |
| |
| // We generate a veneer for a branch if we reach within this distance of the |
| // limit of the range. |
| static constexpr int kVeneerDistanceMargin = 1 * KB; |
| // The factor of 2 is a finger in the air guess. With a default margin of |
| // 1KB, that leaves us an addional 256 instructions to avoid generating a |
| // protective branch. |
| static constexpr int kVeneerNoProtectionFactor = 2; |
| static constexpr int kVeneerDistanceCheckMargin = |
| kVeneerNoProtectionFactor * kVeneerDistanceMargin; |
| int unresolved_branches_first_limit() const { |
| DCHECK(!unresolved_branches_.empty()); |
| return unresolved_branches_.begin()->first; |
| } |
| // This is similar to next_constant_pool_check_ and helps reduce the overhead |
| // of checking for veneer pools. |
| // It is maintained to the closest unresolved branch limit minus the maximum |
| // veneer margin (or kMaxInt if there are no unresolved branches). |
| int next_veneer_pool_check_; |
| |
| private: |
| // If a veneer is emitted for a branch instruction, that instruction must be |
| // removed from the associated label's link chain so that the assembler does |
| // not later attempt (likely unsuccessfully) to patch it to branch directly to |
| // the label. |
| void DeleteUnresolvedBranchInfoForLabel(Label* label); |
| // This function deletes the information related to the label by traversing |
| // the label chain, and for each PC-relative instruction in the chain checking |
| // if pending unresolved information exists. Its complexity is proportional to |
| // the length of the label chain. |
| void DeleteUnresolvedBranchInfoForLabelTraverse(Label* label); |
| |
| private: |
| friend class EnsureSpace; |
| friend class ConstPool; |
| }; |
| |
| class PatchingAssembler : public Assembler { |
| public: |
| // Create an Assembler with a buffer starting at 'start'. |
| // The buffer size is |
| // size of instructions to patch + kGap |
| // Where kGap is the distance from which the Assembler tries to grow the |
| // buffer. |
| // If more or fewer instructions than expected are generated or if some |
| // relocation information takes space in the buffer, the PatchingAssembler |
| // will crash trying to grow the buffer. |
| |
| // This version will flush at destruction. |
| PatchingAssembler(Isolate* isolate, byte* start, unsigned count) |
| : PatchingAssembler(IsolateData(isolate), start, count) { |
| CHECK_NOT_NULL(isolate); |
| isolate_ = isolate; |
| } |
| |
| // This version will not flush. |
| PatchingAssembler(IsolateData isolate_data, byte* start, unsigned count) |
| : Assembler(isolate_data, start, count * kInstructionSize + kGap), |
| isolate_(nullptr) { |
| // Block constant pool emission. |
| StartBlockPools(); |
| } |
| |
| ~PatchingAssembler() { |
| // Const pool should still be blocked. |
| DCHECK(is_const_pool_blocked()); |
| EndBlockPools(); |
| // Verify we have generated the number of instruction we expected. |
| DCHECK((pc_offset() + kGap) == buffer_size_); |
| // Verify no relocation information has been emitted. |
| DCHECK(IsConstPoolEmpty()); |
| // Flush the Instruction cache. |
| size_t length = buffer_size_ - kGap; |
| if (isolate_ != nullptr) Assembler::FlushICache(isolate_, buffer_, length); |
| } |
| |
| // See definition of PatchAdrFar() for details. |
| static constexpr int kAdrFarPatchableNNops = 2; |
| static constexpr int kAdrFarPatchableNInstrs = kAdrFarPatchableNNops + 2; |
| void PatchAdrFar(int64_t target_offset); |
| |
| private: |
| Isolate* isolate_; |
| }; |
| |
| |
| class EnsureSpace BASE_EMBEDDED { |
| public: |
| explicit EnsureSpace(Assembler* assembler) { |
| assembler->CheckBufferSpace(); |
| } |
| }; |
| |
| } // namespace internal |
| } // namespace v8 |
| |
| #endif // V8_ARM64_ASSEMBLER_ARM64_H_ |