1 files changed, 107 insertions, 0 deletions
diff --git a/js/src/jit/arm64/SharedICHelpers-arm64-inl.h b/js/src/jit/arm64/SharedICHelpers-arm64-inl.h
new file mode 100644
index 0000000000..a365374a8a
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+++ b/js/src/jit/arm64/SharedICHelpers-arm64-inl.h
@@ -0,0 +1,107 @@
+/* -*- 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_inl_h
+#define jit_arm64_SharedICHelpers_arm64_inl_h
+
+#include "jit/BaselineFrame.h"
+#include "jit/SharedICHelpers.h"
+
+#include "jit/MacroAssembler-inl.h"
+
+namespace js {
+namespace jit {
+
+inline void EmitBaselineTailCallVM(TrampolinePtr target, MacroAssembler& masm,
+                                   uint32_t argSize) {
+  // We assume that R0 has been pushed, and R2 is unused.
+  static_assert(R2 == ValueOperand(r0));
+
+  // Compute frame size into w0. Used below in makeFrameDescriptor().
+  masm.Sub(x0, BaselineFrameReg64, masm.GetStackPointer64());
+  masm.Add(w0, w0, Operand(BaselineFrame::FramePointerOffset));
+
+#ifdef DEBUG
+  // Store frame size without VMFunction arguments for debug assertions.
+  {
+    vixl::UseScratchRegisterScope temps(&masm.asVIXL());
+    const ARMRegister scratch32 = temps.AcquireW();
+    masm.Sub(scratch32, w0, Operand(argSize));
+    Address frameSizeAddr(BaselineFrameReg,
+                          BaselineFrame::reverseOffsetOfDebugFrameSize());
+    masm.store32(scratch32.asUnsized(), frameSizeAddr);
+  }
+#endif
+
+  // Push frame descriptor (minus the return address) and perform the tail call.
+  static_assert(ICTailCallReg == lr);
+  masm.makeFrameDescriptor(r0, FrameType::BaselineJS, ExitFrameLayout::Size());
+  masm.push(r0);
+
+  // The return address will be pushed by the VM wrapper, for compatibility
+  // with direct calls. Refer to the top of generateVMWrapper().
+  // ICTailCallReg (lr) already contains the return address (as we keep
+  // it there through the stub calls).
+
+  masm.jump(target);
+}
+
+inline void EmitBaselineCreateStubFrameDescriptor(MacroAssembler& masm,
+                                                  Register reg,
+                                                  uint32_t headerSize) {
+  ARMRegister reg64(reg, 64);
+
+  // Compute stub frame size.
+  masm.Sub(reg64, masm.GetStackPointer64(), Operand(sizeof(void*) * 2));
+  masm.Sub(reg64, BaselineFrameReg64, reg64);
+
+  masm.makeFrameDescriptor(reg, FrameType::BaselineStub, headerSize);
+}
+
+inline void EmitBaselineCallVM(TrampolinePtr target, MacroAssembler& masm) {
+  EmitBaselineCreateStubFrameDescriptor(masm, r0, ExitFrameLayout::Size());
+  masm.push(r0);
+  masm.call(target);
+}
+
+// Size of values pushed by EmitBaselineEnterStubFrame.
+static const uint32_t STUB_FRAME_SIZE = 4 * sizeof(void*);
+static const uint32_t STUB_FRAME_SAVED_STUB_OFFSET = sizeof(void*);
+
+inline void EmitBaselineEnterStubFrame(MacroAssembler& masm, Register scratch) {
+  MOZ_ASSERT(scratch != ICTailCallReg);
+
+  // Compute frame size.
+  masm.Add(ARMRegister(scratch, 64), BaselineFrameReg64,
+           Operand(BaselineFrame::FramePointerOffset));
+  masm.Sub(ARMRegister(scratch, 64), ARMRegister(scratch, 64),
+           masm.GetStackPointer64());
+
+#ifdef DEBUG
+  Address frameSizeAddr(BaselineFrameReg,
+                        BaselineFrame::reverseOffsetOfDebugFrameSize());
+  masm.store32(scratch, frameSizeAddr);
+#endif
+
+  // Note: when making changes here, don't forget to update STUB_FRAME_SIZE.
+
+  // Push frame descriptor and return address.
+  // Save old frame pointer, stack pointer, and stub reg.
+  masm.makeFrameDescriptor(scratch, FrameType::BaselineJS,
+                           BaselineStubFrameLayout::Size());
+  masm.Push(scratch, ICTailCallReg, ICStubReg, BaselineFrameReg);
+
+  // Update the frame register.
+  masm.Mov(BaselineFrameReg64, masm.GetStackPointer64());
+
+  // Stack should remain 16-byte aligned.
+  masm.checkStackAlignment();
+}
+
+}  // namespace jit
+}  // namespace js
+
+#endif  // jit_arm64_SharedICHelpers_arm64_inl_h