IR: Make Module::getOrInsertGlobal() return a GlobalVariable.

After pointer element types were removed this function can only return
a GlobalVariable, so reflect that in the type and comments and clean
up callers.

Reviewers: nikic

Reviewed By: nikic

Pull Request: https://github.com/llvm/llvm-project/pull/141323

1 files changed, 4 insertions, 7 deletions

diff --git a/llvm/lib/IR/Module.cpp b/llvm/lib/IR/Module.cpp
index c7daaaf..eb635dc 100644
--- a/llvm/lib/IR/Module.cpp
+++ b/llvm/lib/IR/Module.cpp
@@ -250,12 +250,9 @@ GlobalVariable *Module::getGlobalVariable(StringRef Name,
 }
 
 /// getOrInsertGlobal - Look up the specified global in the module symbol table.
-///   1. If it does not exist, add a declaration of the global and return it.
-///   2. Else, the global exists but has the wrong type: return the function
-///      with a constantexpr cast to the right type.
-///   3. Finally, if the existing global is the correct declaration, return the
-///      existing global.
-Constant *Module::getOrInsertGlobal(
+/// If it does not exist, add a declaration of the global and return it.
+/// Otherwise, return the existing global.
+GlobalVariable *Module::getOrInsertGlobal(
     StringRef Name, Type *Ty,
     function_ref<GlobalVariable *()> CreateGlobalCallback) {
   // See if we have a definition for the specified global already.
@@ -269,7 +266,7 @@ Constant *Module::getOrInsertGlobal(
 }
 
 // Overload to construct a global variable using its constructor's defaults.
-Constant *Module::getOrInsertGlobal(StringRef Name, Type *Ty) {
+GlobalVariable *Module::getOrInsertGlobal(StringRef Name, Type *Ty) {
   return getOrInsertGlobal(Name, Ty, [&] {
     return new GlobalVariable(*this, Ty, false, GlobalVariable::ExternalLinkage,
                               nullptr, Name);