1 files changed, 207 insertions, 0 deletions
diff --git a/js/src/jit/mips-shared/MoveEmitter-mips-shared.cpp b/js/src/jit/mips-shared/MoveEmitter-mips-shared.cpp
new file mode 100644
index 0000000000..5ea8f0b8de
--- /dev/null
+++ b/js/src/jit/mips-shared/MoveEmitter-mips-shared.cpp
@@ -0,0 +1,207 @@
+/* -*- 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/. */
+
+#include "jit/mips-shared/MoveEmitter-mips-shared.h"
+
+#include "jit/MacroAssembler-inl.h"
+
+using namespace js;
+using namespace js::jit;
+
+void MoveEmitterMIPSShared::emit(const MoveResolver& moves) {
+  if (moves.numCycles()) {
+    // Reserve stack for cycle resolution
+    static_assert(SpillSlotSize == 8);
+    masm.reserveStack(moves.numCycles() * SpillSlotSize);
+    pushedAtCycle_ = masm.framePushed();
+  }
+
+  for (size_t i = 0; i < moves.numMoves(); i++) {
+    emit(moves.getMove(i));
+  }
+}
+
+Address MoveEmitterMIPSShared::cycleSlot(uint32_t slot,
+                                         uint32_t subslot) const {
+  int32_t offset = masm.framePushed() - pushedAtCycle_;
+  MOZ_ASSERT(Imm16::IsInSignedRange(offset));
+  return Address(StackPointer, offset + slot * sizeof(double) + subslot);
+}
+
+int32_t MoveEmitterMIPSShared::getAdjustedOffset(const MoveOperand& operand) {
+  MOZ_ASSERT(operand.isMemoryOrEffectiveAddress());
+  if (operand.base() != StackPointer) {
+    return operand.disp();
+  }
+
+  // Adjust offset if stack pointer has been moved.
+  return operand.disp() + masm.framePushed() - pushedAtStart_;
+}
+
+Address MoveEmitterMIPSShared::getAdjustedAddress(const MoveOperand& operand) {
+  return Address(operand.base(), getAdjustedOffset(operand));
+}
+
+Register MoveEmitterMIPSShared::tempReg() {
+  spilledReg_ = SecondScratchReg;
+  return SecondScratchReg;
+}
+
+void MoveEmitterMIPSShared::emitMove(const MoveOperand& from,
+                                     const MoveOperand& to) {
+  if (from.isGeneralReg()) {
+    // Second scratch register should not be moved by MoveEmitter.
+    MOZ_ASSERT(from.reg() != spilledReg_);
+
+    if (to.isGeneralReg()) {
+      masm.movePtr(from.reg(), to.reg());
+    } else if (to.isMemory()) {
+      masm.storePtr(from.reg(), getAdjustedAddress(to));
+    } else {
+      MOZ_CRASH("Invalid emitMove arguments.");
+    }
+  } else if (from.isMemory()) {
+    if (to.isGeneralReg()) {
+      masm.loadPtr(getAdjustedAddress(from), to.reg());
+    } else if (to.isMemory()) {
+      masm.loadPtr(getAdjustedAddress(from), tempReg());
+      masm.storePtr(tempReg(), getAdjustedAddress(to));
+    } else {
+      MOZ_CRASH("Invalid emitMove arguments.");
+    }
+  } else if (from.isEffectiveAddress()) {
+    if (to.isGeneralReg()) {
+      masm.computeEffectiveAddress(getAdjustedAddress(from), to.reg());
+    } else if (to.isMemory()) {
+      masm.computeEffectiveAddress(getAdjustedAddress(from), tempReg());
+      masm.storePtr(tempReg(), getAdjustedAddress(to));
+    } else {
+      MOZ_CRASH("Invalid emitMove arguments.");
+    }
+  } else {
+    MOZ_CRASH("Invalid emitMove arguments.");
+  }
+}
+
+void MoveEmitterMIPSShared::emitInt32Move(const MoveOperand& from,
+                                          const MoveOperand& to) {
+  if (from.isGeneralReg()) {
+    // Second scratch register should not be moved by MoveEmitter.
+    MOZ_ASSERT(from.reg() != spilledReg_);
+
+    if (to.isGeneralReg()) {
+      masm.move32(from.reg(), to.reg());
+    } else if (to.isMemory()) {
+      masm.store32(from.reg(), getAdjustedAddress(to));
+    } else {
+      MOZ_CRASH("Invalid emitInt32Move arguments.");
+    }
+  } else if (from.isMemory()) {
+    if (to.isGeneralReg()) {
+      masm.load32(getAdjustedAddress(from), to.reg());
+    } else if (to.isMemory()) {
+      masm.load32(getAdjustedAddress(from), tempReg());
+      masm.store32(tempReg(), getAdjustedAddress(to));
+    } else {
+      MOZ_CRASH("Invalid emitInt32Move arguments.");
+    }
+  } else if (from.isEffectiveAddress()) {
+    if (to.isGeneralReg()) {
+      masm.computeEffectiveAddress(getAdjustedAddress(from), to.reg());
+    } else if (to.isMemory()) {
+      masm.computeEffectiveAddress(getAdjustedAddress(from), tempReg());
+      masm.store32(tempReg(), getAdjustedAddress(to));
+    } else {
+      MOZ_CRASH("Invalid emitInt32Move arguments.");
+    }
+  } else {
+    MOZ_CRASH("Invalid emitInt32Move arguments.");
+  }
+}
+
+void MoveEmitterMIPSShared::emitFloat32Move(const MoveOperand& from,
+                                            const MoveOperand& to) {
+  // Ensure that we can use ScratchFloat32Reg in memory move.
+  MOZ_ASSERT_IF(from.isFloatReg(), from.floatReg() != ScratchFloat32Reg);
+  MOZ_ASSERT_IF(to.isFloatReg(), to.floatReg() != ScratchFloat32Reg);
+
+  if (from.isFloatReg()) {
+    if (to.isFloatReg()) {
+      masm.moveFloat32(from.floatReg(), to.floatReg());
+    } else if (to.isGeneralReg()) {
+      // This should only be used when passing float parameter in a1,a2,a3
+      MOZ_ASSERT(to.reg() == a1 || to.reg() == a2 || to.reg() == a3);
+      masm.moveFromFloat32(from.floatReg(), to.reg());
+    } else {
+      MOZ_ASSERT(to.isMemory());
+      masm.storeFloat32(from.floatReg(), getAdjustedAddress(to));
+    }
+  } else if (to.isFloatReg()) {
+    MOZ_ASSERT(from.isMemory());
+    masm.loadFloat32(getAdjustedAddress(from), to.floatReg());
+  } else if (to.isGeneralReg()) {
+    MOZ_ASSERT(from.isMemory());
+    // This should only be used when passing float parameter in a1,a2,a3
+    MOZ_ASSERT(to.reg() == a1 || to.reg() == a2 || to.reg() == a3);
+    masm.loadPtr(getAdjustedAddress(from), to.reg());
+  } else {
+    MOZ_ASSERT(from.isMemory());
+    MOZ_ASSERT(to.isMemory());
+    masm.loadFloat32(getAdjustedAddress(from), ScratchFloat32Reg);
+    masm.storeFloat32(ScratchFloat32Reg, getAdjustedAddress(to));
+  }
+}
+
+void MoveEmitterMIPSShared::emit(const MoveOp& move) {
+  const MoveOperand& from = move.from();
+  const MoveOperand& to = move.to();
+
+  if (move.isCycleEnd() && move.isCycleBegin()) {
+    // A fun consequence of aliased registers is you can have multiple
+    // cycles at once, and one can end exactly where another begins.
+    breakCycle(from, to, move.endCycleType(), move.cycleBeginSlot());
+    completeCycle(from, to, move.type(), move.cycleEndSlot());
+    return;
+  }
+
+  if (move.isCycleEnd()) {
+    MOZ_ASSERT(inCycle_);
+    completeCycle(from, to, move.type(), move.cycleEndSlot());
+    MOZ_ASSERT(inCycle_ > 0);
+    inCycle_--;
+    return;
+  }
+
+  if (move.isCycleBegin()) {
+    breakCycle(from, to, move.endCycleType(), move.cycleBeginSlot());
+    inCycle_++;
+  }
+
+  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:
+      emitMove(from, to);
+      break;
+    default:
+      MOZ_CRASH("Unexpected move type");
+  }
+}
+
+void MoveEmitterMIPSShared::assertDone() { MOZ_ASSERT(inCycle_ == 0); }
+
+void MoveEmitterMIPSShared::finish() {
+  assertDone();
+
+  masm.freeStack(masm.framePushed() - pushedAtStart_);
+}