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acec601432
Previously, the AVR backend would put functions in .progmem.data. This is probably a regression from when functions still lived in address space 0. With this change, only global constants are placed in .progmem.data. This is not complete: avr-gcc additionally respects -fdata-sections for progmem global constants, which LLVM doesn't yet do. But fixing that is a bit more complicated (and I believe other backends such as RISC-V might also have similar issues). Differential Revision: https://reviews.llvm.org/D78212
41 lines
1.4 KiB
C++
41 lines
1.4 KiB
C++
//===-- AVRTargetObjectFile.cpp - AVR Object Files ------------------------===//
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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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#include "AVRTargetObjectFile.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/IR/DerivedTypes.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/Mangler.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "AVR.h"
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namespace llvm {
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void AVRTargetObjectFile::Initialize(MCContext &Ctx, const TargetMachine &TM) {
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Base::Initialize(Ctx, TM);
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ProgmemDataSection =
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Ctx.getELFSection(".progmem.data", ELF::SHT_PROGBITS, ELF::SHF_ALLOC);
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}
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MCSection *
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AVRTargetObjectFile::SelectSectionForGlobal(const GlobalObject *GO,
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SectionKind Kind,
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const TargetMachine &TM) const {
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// Global values in flash memory are placed in the progmem.data section
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// unless they already have a user assigned section.
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if (AVR::isProgramMemoryAddress(GO) && !GO->hasSection() && Kind.isReadOnly())
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return ProgmemDataSection;
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// Otherwise, we work the same way as ELF.
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return Base::SelectSectionForGlobal(GO, Kind, TM);
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}
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} // end of namespace llvm
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