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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 14:29:10 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 14:29:10 +0000
commit2aa4a82499d4becd2284cdb482213d541b8804dd (patch)
treeb80bf8bf13c3766139fbacc530efd0dd9d54394c /js/src/jit/x64/SharedICHelpers-x64-inl.h
parentInitial commit. (diff)
downloadfirefox-2aa4a82499d4becd2284cdb482213d541b8804dd.tar.xz
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Adding upstream version 86.0.1.upstream/86.0.1upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'js/src/jit/x64/SharedICHelpers-x64-inl.h')
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1 files changed, 114 insertions, 0 deletions
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+/* -*- 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_x64_SharedICHelpers_x64_inl_h
+#define jit_x64_SharedICHelpers_x64_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) {
+ ScratchRegisterScope scratch(masm);
+
+ // We an assume during this that R0 and R1 have been pushed.
+ masm.movq(BaselineFrameReg, scratch);
+ masm.addq(Imm32(BaselineFrame::FramePointerOffset), scratch);
+ masm.subq(BaselineStackReg, scratch);
+
+#ifdef DEBUG
+ // Store frame size without VMFunction arguments for debug assertions.
+ masm.movq(scratch, rdx);
+ masm.subq(Imm32(argSize), rdx);
+ Address frameSizeAddr(BaselineFrameReg,
+ BaselineFrame::reverseOffsetOfDebugFrameSize());
+ masm.store32(rdx, frameSizeAddr);
+#endif
+
+ // Push frame descriptor and perform the tail call.
+ masm.makeFrameDescriptor(scratch, FrameType::BaselineJS,
+ ExitFrameLayout::Size());
+ masm.push(scratch);
+ masm.push(ICTailCallReg);
+ 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.movq(BaselineFrameReg, reg);
+ masm.addq(Imm32(sizeof(void*) * 2), reg);
+ masm.subq(BaselineStackReg, reg);
+
+ masm.makeFrameDescriptor(reg, FrameType::BaselineStub, headerSize);
+}
+
+inline void EmitBaselineCallVM(TrampolinePtr target, MacroAssembler& masm) {
+ ScratchRegisterScope scratch(masm);
+ EmitBaselineCreateStubFrameDescriptor(masm, scratch, ExitFrameLayout::Size());
+ masm.push(scratch);
+ 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) {
+ ScratchRegisterScope scratch(masm);
+
+ // Compute frame size. Because the return address is still on the stack,
+ // this is:
+ //
+ // BaselineFrameReg
+ // + BaselineFrame::FramePointerOffset
+ // - BaselineStackReg
+ // - sizeof(return address)
+ //
+ // The two constants cancel each other out, so we can just calculate
+ // BaselineFrameReg - BaselineStackReg.
+
+ static_assert(
+ BaselineFrame::FramePointerOffset == sizeof(void*),
+ "FramePointerOffset must be the same as the return address size");
+
+ masm.movq(BaselineFrameReg, scratch);
+ masm.subq(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 the return address that's currently on top of the stack.
+ masm.Push(Operand(BaselineStackReg, 0));
+
+ // Replace the original return address with the frame descriptor.
+ masm.makeFrameDescriptor(scratch, FrameType::BaselineJS,
+ BaselineStubFrameLayout::Size());
+ masm.storePtr(scratch, Address(BaselineStackReg, sizeof(uintptr_t)));
+
+ // Save old frame pointer, stack pointer and stub reg.
+ masm.Push(ICStubReg);
+ masm.Push(BaselineFrameReg);
+ masm.mov(BaselineStackReg, BaselineFrameReg);
+}
+
+} // namespace jit
+} // namespace js
+
+#endif /* jit_x64_SharedICHelpers_x64_inl_h */