ca076f7a63
Rebase of #84114. I've only included the core changes to frame layout calculation & CFI generation which sidesteps the regressions found after merging #84114. Since these changes are a necessary precursor to the overall fix and are themselves slightly beneficial as CFI is now generated correctly, I think it is reasonable to merge this first step. --- For very large stack frames, the offset from the stack pointer to a local can be more than 2^31 which overflows various `int` offsets in the frame lowering code. This patch updates the frame lowering code to calculate the offsets as 64-bit values and fixes CFI to use the corrected sizes. After this patch, additional work is needed to fix offset truncations in each target's codegen.
43 lines
1.5 KiB
C++
43 lines
1.5 KiB
C++
//===-- ARMAsmBackendDarwin.h ARM Asm Backend Darwin ----------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARM_ARMASMBACKENDDARWIN_H
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#define LLVM_LIB_TARGET_ARM_ARMASMBACKENDDARWIN_H
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#include "ARMAsmBackend.h"
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#include "llvm/BinaryFormat/MachO.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCObjectWriter.h"
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namespace llvm {
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class ARMAsmBackendDarwin : public ARMAsmBackend {
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const MCRegisterInfo &MRI;
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Triple TT;
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public:
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const MachO::CPUSubTypeARM Subtype;
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ARMAsmBackendDarwin(const Target &T, const MCSubtargetInfo &STI,
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const MCRegisterInfo &MRI)
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: ARMAsmBackend(T, STI.getTargetTriple().isThumb(),
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llvm::endianness::little),
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MRI(MRI), TT(STI.getTargetTriple()),
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Subtype((MachO::CPUSubTypeARM)cantFail(
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MachO::getCPUSubType(STI.getTargetTriple()))) {}
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std::unique_ptr<MCObjectTargetWriter>
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createObjectTargetWriter() const override {
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return createARMMachObjectWriter(
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/*Is64Bit=*/false, cantFail(MachO::getCPUType(TT)), Subtype);
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}
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uint64_t generateCompactUnwindEncoding(const MCDwarfFrameInfo *FI,
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const MCContext *Ctxt) const override;
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};
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} // end namespace llvm
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#endif
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