1 files changed, 108 insertions, 0 deletions
diff --git a/js/src/jit/arm/SharedICHelpers-arm-inl.h b/js/src/jit/arm/SharedICHelpers-arm-inl.h
new file mode 100644
index 0000000000..dbf46a6416
--- /dev/null
+++ b/js/src/jit/arm/SharedICHelpers-arm-inl.h
@@ -0,0 +1,108 @@
+/* -*- 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_inl_h
+#define jit_arm_SharedICHelpers_arm_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 during this that R0 and R1 have been pushed, and that R2 is
+  // unused.
+  static_assert(R2 == ValueOperand(r1, r0));
+
+  // Compute frame size.
+  masm.movePtr(BaselineFrameReg, r0);
+  masm.as_add(r0, r0, Imm8(BaselineFrame::FramePointerOffset));
+  masm.ma_sub(BaselineStackReg, r0);
+
+#ifdef DEBUG
+  // Store frame size without VMFunction arguments for debug assertions.
+  {
+    ScratchRegisterScope scratch(masm);
+    masm.ma_sub(r0, Imm32(argSize), r1, scratch);
+  }
+  Address frameSizeAddr(BaselineFrameReg,
+                        BaselineFrame::reverseOffsetOfDebugFrameSize());
+  masm.store32(r1, frameSizeAddr);
+#endif
+
+  // Push frame descriptor and perform the tail call.
+  // ICTailCallReg (lr) already contains the return address (as we keep
+  // it there through the stub calls), but the VMWrapper code being called
+  // expects the return address to also be pushed on the stack.
+  static_assert(ICTailCallReg == lr);
+  masm.makeFrameDescriptor(r0, FrameType::BaselineJS, ExitFrameLayout::Size());
+  masm.push(r0);
+  masm.push(lr);
+  masm.jump(target);
+}
+
+inline void EmitBaselineCreateStubFrameDescriptor(MacroAssembler& masm,
+                                                  Register reg,
+                                                  uint32_t headerSize) {
+  // Compute stub frame size. We have to add two pointers: the stub reg and
+  // previous frame pointer pushed by EmitEnterStubFrame.
+  masm.mov(BaselineFrameReg, reg);
+  masm.as_add(reg, reg, Imm8(sizeof(void*) * 2));
+  masm.ma_sub(BaselineStackReg, reg);
+
+  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.mov(BaselineFrameReg, scratch);
+  masm.as_add(scratch, scratch, Imm8(BaselineFrame::FramePointerOffset));
+  masm.ma_sub(BaselineStackReg, scratch);
+
+#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 if
+  // needed.
+
+  // Push frame descriptor and return address.
+  masm.makeFrameDescriptor(scratch, FrameType::BaselineJS,
+                           BaselineStubFrameLayout::Size());
+  masm.Push(scratch);
+  masm.Push(ICTailCallReg);
+
+  // Save old frame pointer, stack pointer and stub reg.
+  masm.Push(ICStubReg);
+  masm.Push(BaselineFrameReg);
+  masm.mov(BaselineStackReg, BaselineFrameReg);
+
+  // We pushed 4 words, so the stack is still aligned to 8 bytes.
+  masm.checkStackAlignment();
+}
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_arm_SharedICHelpers_arm_inl_h */