SERVER-29286 import and use mozjs-60

1 files changed, 300 insertions, 0 deletions

diff --git a/src/third_party/mozjs-60/extract/js/src/jit/arm64/MoveEmitter-arm64.cpp b/src/third_party/mozjs-60/extract/js/src/jit/arm64/MoveEmitter-arm64.cpp
new file mode 100644
index 00000000000..f8e23768312
--- /dev/null
+++ b/src/third_party/mozjs-60/extract/js/src/jit/arm64/MoveEmitter-arm64.cpp
@@ -0,0 +1,300 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ * 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/. */
+
+#include "jit/arm64/MoveEmitter-arm64.h"
+#include "jit/MacroAssembler-inl.h"
+
+using namespace js;
+using namespace js::jit;
+
+MemOperand
+MoveEmitterARM64::toMemOperand(const MoveOperand& operand) const
+{
+    MOZ_ASSERT(operand.isMemory());
+    ARMRegister base(operand.base(), 64);
+    if (operand.base() == masm.getStackPointer())
+        return MemOperand(base, operand.disp() + (masm.framePushed() - pushedAtStart_));
+    return MemOperand(base, operand.disp());
+}
+
+void
+MoveEmitterARM64::emit(const MoveResolver& moves)
+{
+    if (moves.numCycles()) {
+        masm.reserveStack(sizeof(void*));
+        pushedAtCycle_ = masm.framePushed();
+    }
+
+    for (size_t i = 0; i < moves.numMoves(); i++)
+        emitMove(moves.getMove(i));
+}
+
+void
+MoveEmitterARM64::finish()
+{
+    assertDone();
+    masm.freeStack(masm.framePushed() - pushedAtStart_);
+    MOZ_ASSERT(masm.framePushed() == pushedAtStart_);
+}
+
+void
+MoveEmitterARM64::emitMove(const MoveOp& move)
+{
+    const MoveOperand& from = move.from();
+    const MoveOperand& to = move.to();
+
+    if (move.isCycleBegin()) {
+        MOZ_ASSERT(!inCycle_ && !move.isCycleEnd());
+        breakCycle(from, to, move.endCycleType());
+        inCycle_ = true;
+    } else if (move.isCycleEnd()) {
+        MOZ_ASSERT(inCycle_);
+        completeCycle(from, to, move.type());
+        inCycle_ = false;
+        return;
+    }
+
+    switch (move.type()) {
+      case MoveOp::FLOAT32:
+        emitFloat32Move(from, to);
+        break;
+      case MoveOp::DOUBLE:
+        emitDoubleMove(from, to);
+        break;
+      case MoveOp::INT32:
+        emitInt32Move(from, to);
+        break;
+      case MoveOp::GENERAL:
+        emitGeneralMove(from, to);
+        break;
+      default:
+        MOZ_CRASH("Unexpected move type");
+    }
+}
+
+void
+MoveEmitterARM64::emitFloat32Move(const MoveOperand& from, const MoveOperand& to)
+{
+    if (from.isFloatReg()) {
+        if (to.isFloatReg())
+            masm.Fmov(toFPReg(to, MoveOp::FLOAT32), toFPReg(from, MoveOp::FLOAT32));
+        else
+            masm.Str(toFPReg(from, MoveOp::FLOAT32), toMemOperand(to));
+        return;
+    }
+
+    if (to.isFloatReg()) {
+        masm.Ldr(toFPReg(to, MoveOp::FLOAT32), toMemOperand(from));
+        return;
+    }
+
+    vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+    const ARMFPRegister scratch32 = temps.AcquireS();
+    masm.Ldr(scratch32, toMemOperand(from));
+    masm.Str(scratch32, toMemOperand(to));
+}
+
+void
+MoveEmitterARM64::emitDoubleMove(const MoveOperand& from, const MoveOperand& to)
+{
+    if (from.isFloatReg()) {
+        if (to.isFloatReg())
+            masm.Fmov(toFPReg(to, MoveOp::DOUBLE), toFPReg(from, MoveOp::DOUBLE));
+        else
+            masm.Str(toFPReg(from, MoveOp::DOUBLE), toMemOperand(to));
+        return;
+    }
+
+    if (to.isFloatReg()) {
+        masm.Ldr(toFPReg(to, MoveOp::DOUBLE), toMemOperand(from));
+        return;
+    }
+
+    vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+    const ARMFPRegister scratch = temps.AcquireD();
+    masm.Ldr(scratch, toMemOperand(from));
+    masm.Str(scratch, toMemOperand(to));
+}
+
+void
+MoveEmitterARM64::emitInt32Move(const MoveOperand& from, const MoveOperand& to)
+{
+    if (from.isGeneralReg()) {
+        if (to.isGeneralReg())
+            masm.Mov(toARMReg32(to), toARMReg32(from));
+        else
+            masm.Str(toARMReg32(from), toMemOperand(to));
+        return;
+    }
+
+    if (to.isGeneralReg()) {
+        masm.Ldr(toARMReg32(to), toMemOperand(from));
+        return;
+    }
+
+    vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+    const ARMRegister scratch32 = temps.AcquireW();
+    masm.Ldr(scratch32, toMemOperand(from));
+    masm.Str(scratch32, toMemOperand(to));
+}
+
+void
+MoveEmitterARM64::emitGeneralMove(const MoveOperand& from, const MoveOperand& to)
+{
+    if (from.isGeneralReg()) {
+        MOZ_ASSERT(to.isGeneralReg() || to.isMemory());
+        if (to.isGeneralReg())
+            masm.Mov(toARMReg64(to), toARMReg64(from));
+        else
+            masm.Str(toARMReg64(from), toMemOperand(to));
+        return;
+    }
+
+    // {Memory OR EffectiveAddress} -> Register move.
+    if (to.isGeneralReg()) {
+        MOZ_ASSERT(from.isMemoryOrEffectiveAddress());
+        if (from.isMemory())
+            masm.Ldr(toARMReg64(to), toMemOperand(from));
+        else
+            masm.Add(toARMReg64(to), toARMReg64(from), Operand(from.disp()));
+        return;
+    }
+
+    vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+    const ARMRegister scratch64 = temps.AcquireX();
+
+    // Memory -> Memory move.
+    if (from.isMemory()) {
+        MOZ_ASSERT(to.isMemory());
+        masm.Ldr(scratch64, toMemOperand(from));
+        masm.Str(scratch64, toMemOperand(to));
+        return;
+    }
+
+    // EffectiveAddress -> Memory move.
+    MOZ_ASSERT(from.isEffectiveAddress());
+    MOZ_ASSERT(to.isMemory());
+    masm.Add(scratch64, toARMReg64(from), Operand(from.disp()));
+    masm.Str(scratch64, toMemOperand(to));
+}
+
+MemOperand
+MoveEmitterARM64::cycleSlot()
+{
+    // Using SP as stack pointer requires alignment preservation below.
+    MOZ_ASSERT(!masm.GetStackPointer64().Is(sp));
+
+    // emit() already allocated a slot for resolving the cycle.
+    MOZ_ASSERT(pushedAtCycle_ != -1);
+
+    return MemOperand(masm.GetStackPointer64(), masm.framePushed() - pushedAtCycle_);
+}
+
+void
+MoveEmitterARM64::breakCycle(const MoveOperand& from, const MoveOperand& to, MoveOp::Type type)
+{
+    switch (type) {
+      case MoveOp::FLOAT32:
+        if (to.isMemory()) {
+            vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+            const ARMFPRegister scratch32 = temps.AcquireS();
+            masm.Ldr(scratch32, toMemOperand(to));
+            masm.Str(scratch32, cycleSlot());
+        } else {
+            masm.Str(toFPReg(to, type), cycleSlot());
+        }
+        break;
+
+      case MoveOp::DOUBLE:
+        if (to.isMemory()) {
+            vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+            const ARMFPRegister scratch64 = temps.AcquireD();
+            masm.Ldr(scratch64, toMemOperand(to));
+            masm.Str(scratch64, cycleSlot());
+        } else {
+            masm.Str(toFPReg(to, type), cycleSlot());
+        }
+        break;
+
+      case MoveOp::INT32:
+        if (to.isMemory()) {
+            vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+            const ARMRegister scratch32 = temps.AcquireW();
+            masm.Ldr(scratch32, toMemOperand(to));
+            masm.Str(scratch32, cycleSlot());
+        } else {
+            masm.Str(toARMReg32(to), cycleSlot());
+        }
+        break;
+
+      case MoveOp::GENERAL:
+        if (to.isMemory()) {
+            vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+            const ARMRegister scratch64 = temps.AcquireX();
+            masm.Ldr(scratch64, toMemOperand(to));
+            masm.Str(scratch64, cycleSlot());
+        } else {
+            masm.Str(toARMReg64(to), cycleSlot());
+        }
+        break;
+
+      default:
+        MOZ_CRASH("Unexpected move type");
+    }
+}
+
+void
+MoveEmitterARM64::completeCycle(const MoveOperand& from, const MoveOperand& to, MoveOp::Type type)
+{
+    switch (type) {
+      case MoveOp::FLOAT32:
+        if (to.isMemory()) {
+            vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+            const ARMFPRegister scratch32 = temps.AcquireS();
+            masm.Ldr(scratch32, cycleSlot());
+            masm.Str(scratch32, toMemOperand(to));
+        } else {
+            masm.Ldr(toFPReg(to, type), cycleSlot());
+        }
+        break;
+
+      case MoveOp::DOUBLE:
+        if (to.isMemory()) {
+            vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+            const ARMFPRegister scratch = temps.AcquireD();
+            masm.Ldr(scratch, cycleSlot());
+            masm.Str(scratch, toMemOperand(to));
+        } else {
+            masm.Ldr(toFPReg(to, type), cycleSlot());
+        }
+        break;
+
+      case MoveOp::INT32:
+        if (to.isMemory()) {
+            vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+            const ARMRegister scratch32 = temps.AcquireW();
+            masm.Ldr(scratch32, cycleSlot());
+            masm.Str(scratch32, toMemOperand(to));
+        } else {
+            masm.Ldr(toARMReg64(to), cycleSlot());
+        }
+        break;
+
+      case MoveOp::GENERAL:
+        if (to.isMemory()) {
+            vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+            const ARMRegister scratch64 = temps.AcquireX();
+            masm.Ldr(scratch64, cycleSlot());
+            masm.Str(scratch64, toMemOperand(to));
+        } else {
+            masm.Ldr(toARMReg64(to), cycleSlot());
+        }
+        break;
+
+      default:
+        MOZ_CRASH("Unexpected move type");
+    }
+}