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[WebAssembly] Fix use of cast vs dyn_cast

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Differential Revision: https://reviews.llvm.org/D35233

llvm-svn: 307612
This commit is contained in:
Sam Clegg 2017-07-11 02:21:57 +00:00
parent 4dac3f000e
commit 6b124e390a
1 changed files with 7 additions and 15 deletions
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22
lib/MC/WasmObjectWriter.cpp
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@ -404,15 +404,11 @@ void WasmObjectWriter::recordRelocation(MCAssembler &Asm,
const MCSymbolRefExpr *RefA = Target.getSymA();
const auto *SymA = RefA ? cast<MCSymbolWasm>(&RefA->getSymbol()) : nullptr;
bool ViaWeakRef = false;
if (SymA && SymA->isVariable()) {
const MCExpr *Expr = SymA->getVariableValue();
if (const auto *Inner = dyn_cast<MCSymbolRefExpr>(Expr)) {
if (Inner->getKind() == MCSymbolRefExpr::VK_WEAKREF) {
SymA = cast<MCSymbolWasm>(&Inner->getSymbol());
ViaWeakRef = true;
}
}
const auto *Inner = cast<MCSymbolRefExpr>(Expr);
if (Inner->getKind() == MCSymbolRefExpr::VK_WEAKREF)
llvm_unreachable("weakref used in reloc not yet implemented");
}
// Put any constant offset in an addend. Offsets can be negative, and
@ -420,12 +416,8 @@ void WasmObjectWriter::recordRelocation(MCAssembler &Asm,
// be negative and don't wrap.
FixedValue = 0;
if (SymA) {
if (ViaWeakRef)
llvm_unreachable("weakref used in reloc not yet implemented");
else
SymA->setUsedInReloc();
}
if (SymA)
SymA->setUsedInReloc();
assert(!IsPCRel);
assert(SymA);
@ -928,7 +920,7 @@ uint32_t WasmObjectWriter::registerFunctionType(const MCSymbolWasm& Symbol) {
WasmFunctionType F;
if (Symbol.isVariable()) {
const MCExpr *Expr = Symbol.getVariableValue();
auto *Inner = dyn_cast<MCSymbolRefExpr>(Expr);
auto *Inner = cast<MCSymbolRefExpr>(Expr);
const auto *ResolvedSym = cast<MCSymbolWasm>(&Inner->getSymbol());
F.Returns = ResolvedSym->getReturns();
F.Params = ResolvedSym->getParams();
@ -1246,7 +1238,7 @@ void WasmObjectWriter::writeObject(MCAssembler &Asm,
const auto &WS = static_cast<const MCSymbolWasm &>(S);
// Find the target symbol of this weak alias and export that index
const MCExpr *Expr = WS.getVariableValue();
auto *Inner = dyn_cast<MCSymbolRefExpr>(Expr);
auto *Inner = cast<MCSymbolRefExpr>(Expr);
const auto *ResolvedSym = cast<MCSymbolWasm>(&Inner->getSymbol());
DEBUG(dbgs() << WS.getName() << ": weak alias of '" << *ResolvedSym << "'\n");
assert(SymbolIndices.count(ResolvedSym) > 0);