Adding upstream version 86.0.1.upstream/86.0.1upstream

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

1 files changed, 91 insertions, 0 deletions

diff --git a/js/src/jit/arm/SharedICHelpers-arm.h b/js/src/jit/arm/SharedICHelpers-arm.h
new file mode 100644
index 0000000000..eedf83480f
--- /dev/null
+++ b/js/src/jit/arm/SharedICHelpers-arm.h
@@ -0,0 +1,91 @@
+/* -*- 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_arm_SharedICHelpers_arm_h
+#define jit_arm_SharedICHelpers_arm_h
+
+#include "jit/BaselineIC.h"
+#include "jit/JitFrames.h"
+#include "jit/MacroAssembler.h"
+#include "jit/SharedICRegisters.h"
+
+namespace js {
+namespace jit {
+
+// Distance from sp to the top Value inside an IC stub (no return address on the
+// stack on ARM).
+static const size_t ICStackValueOffset = 0;
+
+inline void EmitRestoreTailCallReg(MacroAssembler& masm) {
+  // No-op on ARM because link register is always holding the return address.
+}
+
+inline void EmitRepushTailCallReg(MacroAssembler& masm) {
+  // No-op on ARM because link register is always holding the return address.
+}
+
+inline void EmitCallIC(MacroAssembler& masm, CodeOffset* callOffset) {
+  // The stub pointer must already be in ICStubReg.
+  // Load stubcode pointer from the ICStub.
+  // R2 won't be active when we call ICs, so we can use r0.
+  static_assert(R2 == ValueOperand(r1, r0));
+  masm.loadPtr(Address(ICStubReg, ICStub::offsetOfStubCode()), r0);
+
+  // Call the stubcode via a direct branch-and-link.
+  masm.ma_blx(r0);
+  *callOffset = CodeOffset(masm.currentOffset());
+}
+
+inline void EmitReturnFromIC(MacroAssembler& masm) { masm.ma_mov(lr, pc); }
+
+inline void EmitBaselineLeaveStubFrame(MacroAssembler& masm,
+                                       bool calledIntoIon = false) {
+  ScratchRegisterScope scratch(masm);
+
+  // Ion frames do not save and restore the frame pointer. If we called into
+  // Ion, we have to restore the stack pointer from the frame descriptor. If
+  // we performed a VM call, the descriptor has been popped already so in that
+  // case we use the frame pointer.
+  if (calledIntoIon) {
+    masm.Pop(scratch);
+    masm.rshiftPtr(Imm32(FRAMESIZE_SHIFT), scratch);
+    masm.add32(scratch, BaselineStackReg);
+  } else {
+    masm.mov(BaselineFrameReg, BaselineStackReg);
+  }
+
+  masm.Pop(BaselineFrameReg);
+  masm.Pop(ICStubReg);
+
+  // Load the return address.
+  masm.Pop(ICTailCallReg);
+
+  // Discard the frame descriptor.
+  masm.Pop(scratch);
+}
+
+template <typename AddrType>
+inline void EmitPreBarrier(MacroAssembler& masm, const AddrType& addr,
+                           MIRType type) {
+  // On ARM, lr is clobbered by guardedCallPreBarrier. Save it first.
+  masm.push(lr);
+  masm.guardedCallPreBarrier(addr, type);
+  masm.pop(lr);
+}
+
+inline void EmitStubGuardFailure(MacroAssembler& masm) {
+  // Load next stub into ICStubReg.
+  masm.loadPtr(Address(ICStubReg, ICCacheIRStub::offsetOfNext()), ICStubReg);
+
+  // Return address is already loaded, just jump to the next stubcode.
+  static_assert(ICTailCallReg == lr);
+  masm.jump(Address(ICStubReg, ICStub::offsetOfStubCode()));
+}
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_arm_SharedICHelpers_arm_h */