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Allow multiple declarations to share the same mangled name/LLVM global.

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This is necessary to enable aliasing compiler-generated
symbols with pragma(mangle, …).

Note that globals for internal use are still directly
created.
This commit is contained in:
David Nadlinger
2013-06-16 00:12:02 +02:00
parent 0305d3bce2
commit acd508945a
9 changed files with 63 additions and 34 deletions
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29
gen/llvmhelpers.cpp
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@@ -2024,3 +2024,32 @@ llvm::Constant* DtoConstSymbolAddress(const Loc& loc, Declaration* decl)
llvm_unreachable("Taking constant address not implemented.");
}
llvm::GlobalVariable* getOrCreateGlobal(Loc loc, llvm::Module& module,
llvm::Type* type, bool isConstant, llvm::GlobalValue::LinkageTypes linkage,
llvm::Constant* init, llvm::StringRef name, bool isThreadLocal)
{
llvm::GlobalVariable* existing = module.getGlobalVariable(name, true);
if (existing)
{
if (existing->getType()->getElementType() != type)
{
error(loc, "Global variable type does not match previous "
"declaration with same mangled name: %s", name.str().c_str());
fatal();
}
return existing;
}
#if LDC_LLVM_VER >= 302
// FIXME: clang uses a command line option for the thread model
const llvm::GlobalVariable::ThreadLocalMode tlsModel =
isThreadLocal ? llvm::GlobalVariable::GeneralDynamicTLSModel
: llvm::GlobalVariable::NotThreadLocal;
return new llvm::GlobalVariable(module, type, isConstant, linkage,
init, name, 0, tlsModel);
#else
return new llvm::GlobalVariable(module, type, isConstant, linkage,
init, name, 0, isThreadLocal);
#endif
}