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930ca98433
The fix itself is fairly simple: move getAccessVariant to MCValue so that we replace the old weak expression evaluation with the far more general EvaluateAsRelocatable. This then requires that EvaluateAsRelocatable stop when it finds a non trivial reference kind. And that in turn requires the ELF writer to look harder for weak references. Last but not least, this found a case where we were being bug by bug compatible with gas and accepting an invalid input. I reported pr19647 to track it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207920 91177308-0d34-0410-b5e6-96231b3b80d8
62 lines
1.5 KiB
C++
62 lines
1.5 KiB
C++
//===- lib/MC/MCValue.cpp - MCValue 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/MC/MCValue.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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void MCValue::print(raw_ostream &OS, const MCAsmInfo *MAI) const {
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if (isAbsolute()) {
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OS << getConstant();
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return;
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}
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// FIXME: prints as a number, which isn't ideal. But the meaning will be
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// target-specific anyway.
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if (getRefKind())
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OS << ':' << getRefKind() << ':';
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getSymA()->print(OS);
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if (getSymB()) {
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OS << " - ";
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getSymB()->print(OS);
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}
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if (getConstant())
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OS << " + " << getConstant();
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}
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#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
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void MCValue::dump() const {
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print(dbgs(), nullptr);
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}
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#endif
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MCSymbolRefExpr::VariantKind MCValue::getAccessVariant() const {
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const MCSymbolRefExpr *B = getSymB();
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if (B) {
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if (B->getKind() != MCSymbolRefExpr::VK_None)
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llvm_unreachable("unsupported");
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}
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const MCSymbolRefExpr *A = getSymA();
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if (!A)
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return MCSymbolRefExpr::VK_None;
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MCSymbolRefExpr::VariantKind Kind = A->getKind();
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if (Kind == MCSymbolRefExpr::VK_WEAKREF)
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return MCSymbolRefExpr::VK_None;
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return Kind;
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}
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