CodeGen: Fix address space of global variable
Certain targets (e.g. amdgcn) require global variable to stay in global or constant address
space. In C or C++ global variables are emitted in the default (generic) address space.
This patch introduces virtual functions TargetCodeGenInfo::getGlobalVarAddressSpace
and TargetInfo::getConstantAddressSpace to handle this in a general approach.
It only affects IR generated for amdgcn target.
Differential Revision: https://reviews.llvm.org/D33842
llvm-svn: 307470
diff --git a/clang/lib/CodeGen/CodeGenModule.h b/clang/lib/CodeGen/CodeGenModule.h
index c5f1a2b..b162e72 100644
--- a/clang/lib/CodeGen/CodeGenModule.h
+++ b/clang/lib/CodeGen/CodeGenModule.h
@@ -710,11 +710,15 @@
SourceLocation Loc = SourceLocation(),
bool TLS = false);
- /// Return the address space of the underlying global variable for D, as
+ /// Return the AST address space of the underlying global variable for D, as
/// determined by its declaration. Normally this is the same as the address
/// space of D's type, but in CUDA, address spaces are associated with
- /// declarations, not types.
- unsigned GetGlobalVarAddressSpace(const VarDecl *D, unsigned AddrSpace);
+ /// declarations, not types. If D is nullptr, return the default address
+ /// space for global variable.
+ ///
+ /// For languages without explicit address spaces, if D has default address
+ /// space, target-specific global or constant address space may be returned.
+ unsigned GetGlobalVarAddressSpace(const VarDecl *D);
/// Return the llvm::Constant for the address of the given global variable.
/// If Ty is non-null and if the global doesn't exist, then it will be created