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Move getBaseSymbol somewhere the COFF writer can use.

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I will use it there in a second.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207761 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Rafael Espindola 2014-05-01 13:24:25 +00:00
parent b378cacf1d
commit f2b88ce2fd
3 changed files with 29 additions and 26 deletions
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4
include/llvm/MC/MCAsmLayout.h
View File

@ -17,6 +17,7 @@ namespace llvm {
class MCAssembler;
class MCFragment;
class MCSectionData;
class MCSymbol;
class MCSymbolData;
/// Encapsulates the layout of an assembly file at a particular point in time.
@ -108,6 +109,9 @@ public:
/// \brief Variant that reports a fatal error if the offset is not computable.
uint64_t getSymbolOffset(const MCSymbolData *SD) const;
/// \brief If this symbol is equivalent to A + Constant, return A.
const MCSymbol *getBaseSymbol(const MCSymbol &Symbol) const;
/// @}
};

29
lib/MC/ELFObjectWriter.cpp
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@ -576,29 +576,6 @@ static uint8_t mergeTypeForSet(uint8_t origType, uint8_t newType) {
return Type;
}
static const MCSymbol *getBaseSymbol(const MCAsmLayout &Layout,
const MCSymbol &Symbol) {
if (!Symbol.isVariable())
return &Symbol;
const MCExpr *Expr = Symbol.getVariableValue();
MCValue Value;
if (!Expr->EvaluateAsValue(Value, &Layout))
llvm_unreachable("Invalid Expression");
const MCSymbolRefExpr *RefB = Value.getSymB();
if (RefB)
Layout.getAssembler().getContext().FatalError(
SMLoc(), Twine("symbol '") + RefB->getSymbol().getName() +
"' could not be evaluated in a subtraction expression");
const MCSymbolRefExpr *A = Value.getSymA();
if (!A)
return nullptr;
return &A->getSymbol();
}
void ELFObjectWriter::WriteSymbol(SymbolTableWriter &Writer, ELFSymbolData &MSD,
const MCAsmLayout &Layout) {
MCSymbolData &OrigData = *MSD.SymbolData;
@ -606,7 +583,7 @@ void ELFObjectWriter::WriteSymbol(SymbolTableWriter &Writer, ELFSymbolData &MSD,
(&OrigData.getFragment()->getParent()->getSection() ==
&OrigData.getSymbol().getSection())) &&
"The symbol's section doesn't match the fragment's symbol");
const MCSymbol *Base = getBaseSymbol(Layout, OrigData.getSymbol());
const MCSymbol *Base = Layout.getBaseSymbol(OrigData.getSymbol());
// This has to be in sync with when computeSymbolTable uses SHN_ABS or
// SHN_COMMON.
@ -935,7 +912,7 @@ bool ELFObjectWriter::isInSymtab(const MCAsmLayout &Layout,
return true;
if (Symbol.isVariable()) {
const MCSymbol *Base = getBaseSymbol(Layout, Symbol);
const MCSymbol *Base = Layout.getBaseSymbol(Symbol);
if (Base && Base->isUndefined())
return false;
}
@ -1022,7 +999,7 @@ ELFObjectWriter::computeSymbolTable(MCAssembler &Asm, const MCAsmLayout &Layout,
ELFSymbolData MSD;
MSD.SymbolData = &SD;
const MCSymbol *BaseSymbol = getBaseSymbol(Layout, Symbol);
const MCSymbol *BaseSymbol = Layout.getBaseSymbol(Symbol);
// Undefined symbols are global, but this is the first place we
// are able to set it.

22
lib/MC/MCAssembler.cpp
View File

@ -180,6 +180,28 @@ uint64_t MCAsmLayout::getSymbolOffset(const MCSymbolData *SD) const {
return Val;
}
const MCSymbol *MCAsmLayout::getBaseSymbol(const MCSymbol &Symbol) const {
if (!Symbol.isVariable())
return &Symbol;
const MCExpr *Expr = Symbol.getVariableValue();
MCValue Value;
if (!Expr->EvaluateAsValue(Value, this))
llvm_unreachable("Invalid Expression");
const MCSymbolRefExpr *RefB = Value.getSymB();
if (RefB)
Assembler.getContext().FatalError(
SMLoc(), Twine("symbol '") + RefB->getSymbol().getName() +
"' could not be evaluated in a subtraction expression");
const MCSymbolRefExpr *A = Value.getSymA();
if (!A)
return nullptr;
return &A->getSymbol();
}
uint64_t MCAsmLayout::getSectionAddressSize(const MCSectionData *SD) const {
// The size is the last fragment's end offset.
const MCFragment &F = SD->getFragmentList().back();