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https://github.com/c64scene-ar/llvm-6502.git
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b9cb76d3f3
Summary: This fixes a long standing issue where we would emit many little .text sections and only one .pdata and .xdata section. Now we generate one .pdata / .xdata pair per .text section and associate them correctly. Fixes PR19667. Reviewers: majnemer Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D5181 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@217176 91177308-0d34-0410-b5e6-96231b3b80d8
85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
//===- lib/MC/MCWinEH.cpp - Windows EH implementation ---------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringRef.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCObjectFileInfo.h"
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#include "llvm/MC/MCSectionCOFF.h"
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#include "llvm/MC/MCSymbol.h"
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#include "llvm/MC/MCWinEH.h"
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#include "llvm/Support/COFF.h"
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namespace llvm {
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namespace WinEH {
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static StringRef getSectionSuffix(const MCSymbol *Function) {
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if (!Function || !Function->isInSection())
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return "";
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const MCSection *FunctionSection = &Function->getSection();
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if (const auto Section = dyn_cast<MCSectionCOFF>(FunctionSection)) {
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StringRef Name = Section->getSectionName();
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size_t Dollar = Name.find('$');
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size_t Dot = Name.find('.', 1);
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if (Dollar == StringRef::npos && Dot == StringRef::npos)
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return "";
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if (Dot == StringRef::npos)
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return Name.substr(Dollar);
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if (Dollar == StringRef::npos || Dot < Dollar)
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return Name.substr(Dot);
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return Name.substr(Dollar);
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}
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return "";
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}
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static const MCSection *getUnwindInfoSection(
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StringRef SecName, const MCSectionCOFF *UnwindSec, const MCSymbol *Function,
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MCContext &Context) {
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// If Function is in a COMDAT, get or create an unwind info section in that
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// COMDAT group.
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if (Function && Function->isInSection()) {
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const MCSectionCOFF *FunctionSection =
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cast<MCSectionCOFF>(&Function->getSection());
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if (FunctionSection->getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT) {
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return Context.getAssociativeCOFFSection(
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UnwindSec, FunctionSection->getCOMDATSymbol());
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}
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}
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// If Function is in a section other than .text, create a new .pdata section.
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// Otherwise use the plain .pdata section.
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StringRef Suffix = getSectionSuffix(Function);
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if (Suffix.empty())
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return UnwindSec;
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return Context.getCOFFSection((SecName + Suffix).str(),
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COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
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COFF::IMAGE_SCN_MEM_READ,
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SectionKind::getDataRel());
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}
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const MCSection *UnwindEmitter::getPDataSection(const MCSymbol *Function,
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MCContext &Context) {
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const MCSectionCOFF *PData =
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cast<MCSectionCOFF>(Context.getObjectFileInfo()->getPDataSection());
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return getUnwindInfoSection(".pdata", PData, Function, Context);
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}
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const MCSection *UnwindEmitter::getXDataSection(const MCSymbol *Function,
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MCContext &Context) {
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const MCSectionCOFF *XData =
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cast<MCSectionCOFF>(Context.getObjectFileInfo()->getXDataSection());
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return getUnwindInfoSection(".xdata", XData, Function, Context);
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}
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}
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}
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