Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 82 insertions, 0 deletions

diff --git a/js/src/jit/arm64/SharedICHelpers-arm64.h b/js/src/jit/arm64/SharedICHelpers-arm64.h
new file mode 100644
index 0000000000..2ea45c80fb
--- /dev/null
+++ b/js/src/jit/arm64/SharedICHelpers-arm64.h
@@ -0,0 +1,82 @@
+/* -*- 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_arm64_SharedICHelpers_arm64_h
+#define jit_arm64_SharedICHelpers_arm64_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(r0));
+  masm.loadPtr(Address(ICStubReg, ICStub::offsetOfStubCode()), r0);
+
+  // Call the stubcode via a direct branch-and-link.
+  masm.Blr(x0);
+  *callOffset = CodeOffset(masm.currentOffset());
+}
+
+inline void EmitReturnFromIC(MacroAssembler& masm) {
+  masm.abiret();  // Defaults to lr.
+}
+
+inline void EmitBaselineLeaveStubFrame(MacroAssembler& masm) {
+  vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+  const ARMRegister scratch64 = temps.AcquireX();
+
+  Address stubAddr(FramePointer, BaselineStubFrameLayout::ICStubOffsetFromFP);
+  masm.loadPtr(stubAddr, ICStubReg);
+
+  masm.moveToStackPtr(FramePointer);
+
+  // Pop values, discarding the frame descriptor.
+  masm.pop(FramePointer, ICTailCallReg, scratch64.asUnsized());
+
+  // Stack should remain 16-byte aligned.
+  masm.checkStackAlignment();
+}
+
+template <typename AddrType>
+inline void EmitPreBarrier(MacroAssembler& masm, const AddrType& addr,
+                           MIRType type) {
+  // On AArch64, 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.
+  masm.jump(Address(ICStubReg, ICStub::offsetOfStubCode()));
+}
+
+}  // namespace jit
+}  // namespace js
+
+#endif  // jit_arm64_SharedICHelpers_arm64_h