Adding upstream version 86.0.1.upstream/86.0.1upstream

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

1 files changed, 106 insertions, 0 deletions

diff --git a/js/src/jit/mips-shared/SharedICHelpers-mips-shared.h b/js/src/jit/mips-shared/SharedICHelpers-mips-shared.h
new file mode 100644
index 0000000000..5b42b7261c
--- /dev/null
+++ b/js/src/jit/mips-shared/SharedICHelpers-mips-shared.h
@@ -0,0 +1,106 @@
+/* -*- 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_mips_shared_SharedICHelpers_mips_shared_h
+#define jit_mips_shared_SharedICHelpers_mips_shared_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 MIPS).
+static const size_t ICStackValueOffset = 0;
+
+struct BaselineStubFrame {
+  uintptr_t savedFrame;
+  uintptr_t savedStub;
+  uintptr_t returnAddress;
+  uintptr_t descriptor;
+};
+
+// Size of values pushed by EmitBaselineEnterStubFrame.
+static const uint32_t STUB_FRAME_SIZE = sizeof(BaselineStubFrame);
+static const uint32_t STUB_FRAME_SAVED_STUB_OFFSET =
+    offsetof(BaselineStubFrame, savedStub);
+
+inline void EmitRestoreTailCallReg(MacroAssembler& masm) {
+  // No-op on MIPS because ra register is always holding the return address.
+}
+
+inline void EmitRepushTailCallReg(MacroAssembler& masm) {
+  // No-op on MIPS because ra 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 it as scratch.
+  masm.loadPtr(Address(ICStubReg, ICStub::offsetOfStubCode()), R2.scratchReg());
+
+  // Call the stubcode via a direct jump-and-link
+  masm.call(R2.scratchReg());
+  *callOffset = CodeOffset(masm.currentOffset());
+}
+
+inline void EmitReturnFromIC(MacroAssembler& masm) { masm.branch(ra); }
+
+inline void EmitBaselineLeaveStubFrame(MacroAssembler& masm,
+                                       bool calledIntoIon = false) {
+  // 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(ScratchRegister);
+    masm.rshiftPtr(Imm32(FRAMESIZE_SHIFT), ScratchRegister);
+    masm.addPtr(ScratchRegister, BaselineStackReg);
+  } else {
+    masm.movePtr(BaselineFrameReg, BaselineStackReg);
+  }
+
+  masm.loadPtr(Address(StackPointer, offsetof(BaselineStubFrame, savedFrame)),
+               BaselineFrameReg);
+  masm.loadPtr(Address(StackPointer, offsetof(BaselineStubFrame, savedStub)),
+               ICStubReg);
+
+  // Load the return address.
+  masm.loadPtr(
+      Address(StackPointer, offsetof(BaselineStubFrame, returnAddress)),
+      ICTailCallReg);
+
+  // Discard the frame descriptor.
+  masm.loadPtr(Address(StackPointer, offsetof(BaselineStubFrame, descriptor)),
+               ScratchRegister);
+  masm.addPtr(Imm32(STUB_FRAME_SIZE), StackPointer);
+}
+
+template <typename AddrType>
+inline void EmitPreBarrier(MacroAssembler& masm, const AddrType& addr,
+                           MIRType type) {
+  // On MIPS, $ra is clobbered by guardedCallPreBarrier. Save it first.
+  masm.push(ra);
+  masm.guardedCallPreBarrier(addr, type);
+  masm.pop(ra);
+}
+
+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.
+  MOZ_ASSERT(ICTailCallReg == ra);
+  masm.jump(Address(ICStubReg, ICStub::offsetOfStubCode()));
+}
+
+}  // namespace jit
+}  // namespace js
+
+#endif /* jit_mips_shared_SharedICHelpers_mips_shared_h */