Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 479 insertions, 0 deletions

diff --git a/js/src/jit/x86-shared/Architecture-x86-shared.h b/js/src/jit/x86-shared/Architecture-x86-shared.h
new file mode 100644
index 0000000000..b79c683381
--- /dev/null
+++ b/js/src/jit/x86-shared/Architecture-x86-shared.h
@@ -0,0 +1,479 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef jit_x86_shared_Architecture_x86_h
+#define jit_x86_shared_Architecture_x86_h
+
+#if !defined(JS_CODEGEN_X86) && !defined(JS_CODEGEN_X64)
+#  error "Unsupported architecture!"
+#endif
+
+#include "mozilla/MathAlgorithms.h"
+
+#include <string.h>
+
+#include "jit/shared/Architecture-shared.h"
+
+#include "jit/x86-shared/Constants-x86-shared.h"
+
+namespace js {
+namespace jit {
+
+#if defined(JS_CODEGEN_X86)
+// In bytes: slots needed for potential memory->memory move spills.
+//   +8 for cycles
+//   +4 for gpr spills
+//   +8 for double spills
+static const uint32_t ION_FRAME_SLACK_SIZE = 20;
+
+#elif defined(JS_CODEGEN_X64)
+// In bytes: slots needed for potential memory->memory move spills.
+//   +8 for cycles
+//   +8 for gpr spills
+//   +8 for double spills
+static const uint32_t ION_FRAME_SLACK_SIZE = 24;
+#endif
+
+#if defined(JS_CODEGEN_X86)
+// These offsets are specific to nunboxing, and capture offsets into the
+// components of a js::Value.
+static const int32_t NUNBOX32_TYPE_OFFSET = 4;
+static const int32_t NUNBOX32_PAYLOAD_OFFSET = 0;
+
+// Size of each bailout table entry. On x86 this is a 5-byte relative call.
+static const uint32_t BAILOUT_TABLE_ENTRY_SIZE = 5;
+#endif
+
+#if defined(JS_CODEGEN_X64) && defined(_WIN64)
+static const uint32_t ShadowStackSpace = 32;
+#else
+static const uint32_t ShadowStackSpace = 0;
+#endif
+
+static const uint32_t JumpImmediateRange = INT32_MAX;
+
+class Registers {
+ public:
+  using Code = uint8_t;
+  using Encoding = X86Encoding::RegisterID;
+
+  // Content spilled during bailouts.
+  union RegisterContent {
+    uintptr_t r;
+  };
+
+#if defined(JS_CODEGEN_X86)
+  using SetType = uint8_t;
+
+  static const char* GetName(Code code) {
+    return X86Encoding::GPRegName(Encoding(code));
+  }
+
+  static const uint32_t Total = 8;
+  static const uint32_t TotalPhys = 8;
+  static const uint32_t Allocatable = 7;
+
+#elif defined(JS_CODEGEN_X64)
+  using SetType = uint16_t;
+
+  static const char* GetName(Code code) {
+    static const char* const Names[] = {
+        "rax", "rcx", "rdx", "rbx", "rsp", "rbp", "rsi", "rdi",
+        "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15"};
+    return Names[code];
+  }
+
+  static const uint32_t Total = 16;
+  static const uint32_t TotalPhys = 16;
+  static const uint32_t Allocatable = 14;
+#endif
+
+  static uint32_t SetSize(SetType x) {
+    static_assert(sizeof(SetType) <= 4, "SetType must be, at most, 32 bits");
+    return mozilla::CountPopulation32(x);
+  }
+  static uint32_t FirstBit(SetType x) {
+    return mozilla::CountTrailingZeroes32(x);
+  }
+  static uint32_t LastBit(SetType x) {
+    return 31 - mozilla::CountLeadingZeroes32(x);
+  }
+
+  static Code FromName(const char* name) {
+    for (size_t i = 0; i < Total; i++) {
+      if (strcmp(GetName(Code(i)), name) == 0) {
+        return Code(i);
+      }
+    }
+    return Invalid;
+  }
+
+  static const Encoding StackPointer = X86Encoding::rsp;
+  static const Encoding Invalid = X86Encoding::invalid_reg;
+
+  static const SetType AllMask = (1 << Total) - 1;
+
+#if defined(JS_CODEGEN_X86)
+  static const SetType ArgRegMask = 0;
+
+  static const SetType VolatileMask = (1 << X86Encoding::rax) |
+                                      (1 << X86Encoding::rcx) |
+                                      (1 << X86Encoding::rdx);
+
+  static const SetType WrapperMask = VolatileMask | (1 << X86Encoding::rbx);
+
+  static const SetType SingleByteRegs =
+      (1 << X86Encoding::rax) | (1 << X86Encoding::rcx) |
+      (1 << X86Encoding::rdx) | (1 << X86Encoding::rbx);
+
+  static const SetType NonAllocatableMask = (1 << X86Encoding::rsp);
+
+  // Registers returned from a JS -> JS call.
+  static const SetType JSCallMask =
+      (1 << X86Encoding::rcx) | (1 << X86Encoding::rdx);
+
+  // Registers returned from a JS -> C call.
+  static const SetType CallMask = (1 << X86Encoding::rax);
+
+#elif defined(JS_CODEGEN_X64)
+  static const SetType ArgRegMask =
+#  if !defined(_WIN64)
+      (1 << X86Encoding::rdi) | (1 << X86Encoding::rsi) |
+#  endif
+      (1 << X86Encoding::rdx) | (1 << X86Encoding::rcx) |
+      (1 << X86Encoding::r8) | (1 << X86Encoding::r9);
+
+  static const SetType VolatileMask = (1 << X86Encoding::rax) | ArgRegMask |
+                                      (1 << X86Encoding::r10) |
+                                      (1 << X86Encoding::r11);
+
+  static const SetType WrapperMask = VolatileMask;
+
+  static const SetType SingleByteRegs = AllMask & ~(1 << X86Encoding::rsp);
+
+  static const SetType NonAllocatableMask =
+      (1 << X86Encoding::rsp) | (1 << X86Encoding::r11);  // This is ScratchReg.
+
+  // Registers returned from a JS -> JS call.
+  static const SetType JSCallMask = (1 << X86Encoding::rcx);
+
+  // Registers returned from a JS -> C call.
+  static const SetType CallMask = (1 << X86Encoding::rax);
+
+#endif
+
+  static const SetType NonVolatileMask =
+      AllMask & ~VolatileMask & ~(1 << X86Encoding::rsp);
+
+  static const SetType AllocatableMask = AllMask & ~NonAllocatableMask;
+};
+
+using PackedRegisterMask = Registers::SetType;
+
+class FloatRegisters {
+ public:
+  using Encoding = X86Encoding::XMMRegisterID;
+
+  // Observe that there is a Simd128 type on both x86 and x64 whether SIMD is
+  // implemented/enabled or not, and that the RegisterContent union is large
+  // enough for a V128 datum always.  Producers and consumers of a register dump
+  // must be aware of this even if they don't need to save/restore values in the
+  // high lanes of the SIMD registers.  See the DumpAllRegs() implementations,
+  // for example.
+
+  enum ContentType {
+    Single,   // 32-bit float.
+    Double,   // 64-bit double.
+    Simd128,  // 128-bit Wasm SIMD type.
+    NumTypes
+  };
+
+  // Content spilled during bailouts.
+  union RegisterContent {
+    float s;
+    double d;
+    uint8_t v128[16];
+  };
+
+  static const char* GetName(Encoding code) {
+    return X86Encoding::XMMRegName(code);
+  }
+
+  static Encoding FromName(const char* name) {
+    for (size_t i = 0; i < Total; i++) {
+      if (strcmp(GetName(Encoding(i)), name) == 0) {
+        return Encoding(i);
+      }
+    }
+    return Invalid;
+  }
+
+  static const Encoding Invalid = X86Encoding::invalid_xmm;
+
+#if defined(JS_CODEGEN_X86)
+  static const uint32_t Total = 8 * NumTypes;
+  static const uint32_t TotalPhys = 8;
+  static const uint32_t Allocatable = 7;
+  using SetType = uint32_t;
+#elif defined(JS_CODEGEN_X64)
+  static const uint32_t Total = 16 * NumTypes;
+  static const uint32_t TotalPhys = 16;
+  static const uint32_t Allocatable = 15;
+  using SetType = uint64_t;
+#endif
+
+  static_assert(sizeof(SetType) * 8 >= Total,
+                "SetType should be large enough to enumerate all registers.");
+
+  // Magic values which are used to duplicate a mask of physical register for
+  // a specific type of register. A multiplication is used to copy and shift
+  // the bits of the physical register mask.
+  static const SetType SpreadSingle = SetType(1)
+                                      << (uint32_t(Single) * TotalPhys);
+  static const SetType SpreadDouble = SetType(1)
+                                      << (uint32_t(Double) * TotalPhys);
+  static const SetType SpreadSimd128 = SetType(1)
+                                       << (uint32_t(Simd128) * TotalPhys);
+  static const SetType SpreadScalar = SpreadSingle | SpreadDouble;
+  static const SetType SpreadVector = SpreadSimd128;
+  static const SetType Spread = SpreadScalar | SpreadVector;
+
+  static const SetType AllPhysMask = ((1 << TotalPhys) - 1);
+  static const SetType AllMask = AllPhysMask * Spread;
+  static const SetType AllDoubleMask = AllPhysMask * SpreadDouble;
+  static const SetType AllSingleMask = AllPhysMask * SpreadSingle;
+  static const SetType AllVector128Mask = AllPhysMask * SpreadSimd128;
+
+#if defined(JS_CODEGEN_X86)
+  static const SetType NonAllocatableMask =
+      Spread * (1 << X86Encoding::xmm7);  // This is ScratchDoubleReg.
+
+#elif defined(JS_CODEGEN_X64)
+  static const SetType NonAllocatableMask =
+      Spread * (1 << X86Encoding::xmm15);  // This is ScratchDoubleReg.
+#endif
+
+#if defined(JS_CODEGEN_X64) && defined(_WIN64)
+  static const SetType VolatileMask =
+      ((1 << X86Encoding::xmm0) | (1 << X86Encoding::xmm1) |
+       (1 << X86Encoding::xmm2) | (1 << X86Encoding::xmm3) |
+       (1 << X86Encoding::xmm4) | (1 << X86Encoding::xmm5)) *
+          SpreadScalar |
+      AllPhysMask * SpreadVector;
+#else
+  static const SetType VolatileMask = AllMask;
+#endif
+
+  static const SetType NonVolatileMask = AllMask & ~VolatileMask;
+  static const SetType WrapperMask = VolatileMask;
+  static const SetType AllocatableMask = AllMask & ~NonAllocatableMask;
+};
+
+template <typename T>
+class TypedRegisterSet;
+
+struct FloatRegister {
+  using Codes = FloatRegisters;
+  using Code = size_t;
+  using Encoding = Codes::Encoding;
+  using SetType = Codes::SetType;
+  static uint32_t SetSize(SetType x) {
+    // Count the number of non-aliased registers, for the moment.
+    //
+    // Copy the set bits of each typed register to the low part of the of
+    // the Set, and count the number of registers. This is made to avoid
+    // registers which are allocated twice with different types (such as in
+    // AllMask).
+    x |= x >> (2 * Codes::TotalPhys);
+    x |= x >> Codes::TotalPhys;
+    x &= Codes::AllPhysMask;
+    static_assert(Codes::AllPhysMask <= 0xffff,
+                  "We can safely use CountPopulation32");
+    return mozilla::CountPopulation32(x);
+  }
+
+#if defined(JS_CODEGEN_X86)
+  static uint32_t FirstBit(SetType x) {
+    static_assert(sizeof(SetType) == 4, "SetType must be 32 bits");
+    return mozilla::CountTrailingZeroes32(x);
+  }
+  static uint32_t LastBit(SetType x) {
+    return 31 - mozilla::CountLeadingZeroes32(x);
+  }
+
+#elif defined(JS_CODEGEN_X64)
+  static uint32_t FirstBit(SetType x) {
+    static_assert(sizeof(SetType) == 8, "SetType must be 64 bits");
+    return mozilla::CountTrailingZeroes64(x);
+  }
+  static uint32_t LastBit(SetType x) {
+    return 63 - mozilla::CountLeadingZeroes64(x);
+  }
+#endif
+
+ private:
+  // Note: These fields are using one extra bit to make the invalid enumerated
+  // values fit, and thus prevent a warning.
+  Codes::Encoding reg_ : 5;
+  Codes::ContentType type_ : 3;
+  bool isInvalid_ : 1;
+
+  // Constants used for exporting/importing the float register code.
+#if defined(JS_CODEGEN_X86)
+  static const size_t RegSize = 3;
+#elif defined(JS_CODEGEN_X64)
+  static const size_t RegSize = 4;
+#endif
+  static const size_t RegMask = (1 << RegSize) - 1;
+
+ public:
+  constexpr FloatRegister()
+      : reg_(Codes::Encoding(0)), type_(Codes::Single), isInvalid_(true) {}
+  constexpr FloatRegister(uint32_t r, Codes::ContentType k)
+      : reg_(Codes::Encoding(r)), type_(k), isInvalid_(false) {}
+  constexpr FloatRegister(Codes::Encoding r, Codes::ContentType k)
+      : reg_(r), type_(k), isInvalid_(false) {}
+
+  static FloatRegister FromCode(uint32_t i) {
+    MOZ_ASSERT(i < Codes::Total);
+    return FloatRegister(i & RegMask, Codes::ContentType(i >> RegSize));
+  }
+
+  bool isSingle() const {
+    MOZ_ASSERT(!isInvalid());
+    return type_ == Codes::Single;
+  }
+  bool isDouble() const {
+    MOZ_ASSERT(!isInvalid());
+    return type_ == Codes::Double;
+  }
+  bool isSimd128() const {
+    MOZ_ASSERT(!isInvalid());
+    return type_ == Codes::Simd128;
+  }
+  bool isInvalid() const { return isInvalid_; }
+
+  FloatRegister asSingle() const {
+    MOZ_ASSERT(!isInvalid());
+    return FloatRegister(reg_, Codes::Single);
+  }
+  FloatRegister asDouble() const {
+    MOZ_ASSERT(!isInvalid());
+    return FloatRegister(reg_, Codes::Double);
+  }
+  FloatRegister asSimd128() const {
+    MOZ_ASSERT(!isInvalid());
+    return FloatRegister(reg_, Codes::Simd128);
+  }
+
+  uint32_t size() const {
+    MOZ_ASSERT(!isInvalid());
+    if (isSingle()) {
+      return sizeof(float);
+    }
+    if (isDouble()) {
+      return sizeof(double);
+    }
+    MOZ_ASSERT(isSimd128());
+    return 4 * sizeof(int32_t);
+  }
+
+  Code code() const {
+    MOZ_ASSERT(!isInvalid());
+    MOZ_ASSERT(uint32_t(reg_) < Codes::TotalPhys);
+    // :TODO: ARM is doing the same thing, but we should avoid this, except
+    // that the RegisterSets depends on this.
+    return Code(reg_ | (type_ << RegSize));
+  }
+  Encoding encoding() const {
+    MOZ_ASSERT(!isInvalid());
+    MOZ_ASSERT(uint32_t(reg_) < Codes::TotalPhys);
+    return reg_;
+  }
+  // defined in Assembler-x86-shared.cpp
+  const char* name() const;
+  bool volatile_() const {
+    return !!((SetType(1) << code()) & FloatRegisters::VolatileMask);
+  }
+  bool operator!=(FloatRegister other) const {
+    return other.reg_ != reg_ || other.type_ != type_;
+  }
+  bool operator==(FloatRegister other) const {
+    return other.reg_ == reg_ && other.type_ == type_;
+  }
+  bool aliases(FloatRegister other) const { return other.reg_ == reg_; }
+  // Check if two floating point registers have the same type.
+  bool equiv(FloatRegister other) const { return other.type_ == type_; }
+
+  uint32_t numAliased() const { return Codes::NumTypes; }
+  uint32_t numAlignedAliased() const { return numAliased(); }
+
+  FloatRegister aliased(uint32_t aliasIdx) const {
+    MOZ_ASSERT(aliasIdx < Codes::NumTypes);
+    return FloatRegister(
+        reg_, Codes::ContentType((aliasIdx + type_) % Codes::NumTypes));
+  }
+  FloatRegister alignedAliased(uint32_t aliasIdx) const {
+    return aliased(aliasIdx);
+  }
+
+  SetType alignedOrDominatedAliasedSet() const { return Codes::Spread << reg_; }
+
+  static constexpr RegTypeName DefaultType = RegTypeName::Float64;
+
+  template <RegTypeName = DefaultType>
+  static SetType LiveAsIndexableSet(SetType s) {
+    return SetType(0);
+  }
+
+  template <RegTypeName Name = DefaultType>
+  static SetType AllocatableAsIndexableSet(SetType s) {
+    static_assert(Name != RegTypeName::Any, "Allocatable set are not iterable");
+    return LiveAsIndexableSet<Name>(s);
+  }
+
+  static TypedRegisterSet<FloatRegister> ReduceSetForPush(
+      const TypedRegisterSet<FloatRegister>& s);
+  static uint32_t GetPushSizeInBytes(const TypedRegisterSet<FloatRegister>& s);
+  uint32_t getRegisterDumpOffsetInBytes();
+};
+
+template <>
+inline FloatRegister::SetType
+FloatRegister::LiveAsIndexableSet<RegTypeName::Float32>(SetType set) {
+  return set & FloatRegisters::AllSingleMask;
+}
+
+template <>
+inline FloatRegister::SetType
+FloatRegister::LiveAsIndexableSet<RegTypeName::Float64>(SetType set) {
+  return set & FloatRegisters::AllDoubleMask;
+}
+
+template <>
+inline FloatRegister::SetType
+FloatRegister::LiveAsIndexableSet<RegTypeName::Vector128>(SetType set) {
+  return set & FloatRegisters::AllVector128Mask;
+}
+
+template <>
+inline FloatRegister::SetType
+FloatRegister::LiveAsIndexableSet<RegTypeName::Any>(SetType set) {
+  return set;
+}
+
+// Arm/D32 has double registers that can NOT be treated as float32
+// and this requires some dances in lowering.
+inline bool hasUnaliasedDouble() { return false; }
+
+// On ARM, Dn aliases both S2n and S2n+1, so if you need to convert a float32
+// to a double as a temporary, you need a temporary double register.
+inline bool hasMultiAlias() { return false; }
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_x86_shared_Architecture_x86_h */