Add support to create local variable's debug info.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121211 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/DIBuilder.cpp b/lib/Analysis/DIBuilder.cpp
index 6d32afe..4b1988c 100644
--- a/lib/Analysis/DIBuilder.cpp
+++ b/lib/Analysis/DIBuilder.cpp
@@ -27,6 +27,7 @@
"Tag too large for debug encoding!");
return ConstantInt::get(Type::getInt32Ty(VMContext), Tag | LLVMDebugVersion);
}
+
DIBuilder::DIBuilder(Module &m)
: M(m), VMContext(M.getContext()), TheCU(0), DeclareFn(0), ValueFn(0) {}
@@ -368,6 +369,38 @@
return DIGlobalVariable(Node);
}
+/// CreateVariable - Create a new descriptor for the specified variable.
+DIVariable DIBuilder::CreateLocalVariable(unsigned Tag, DIDescriptor Scope,
+ StringRef Name, DIFile File,
+ unsigned LineNo, DIType Ty,
+ bool AlwaysPreserve, unsigned Flags) {
+ Value *Elts[] = {
+ GetTagConstant(VMContext, Tag),
+ Scope,
+ MDString::get(VMContext, Name),
+ File,
+ ConstantInt::get(Type::getInt32Ty(VMContext), LineNo),
+ Ty,
+ ConstantInt::get(Type::getInt32Ty(VMContext), Flags)
+ };
+ MDNode *Node = MDNode::get(VMContext, &Elts[0], array_lengthof(Elts));
+ if (AlwaysPreserve) {
+ // The optimizer may remove local variable. If there is an interest
+ // to preserve variable info in such situation then stash it in a
+ // named mdnode.
+ DISubprogram Fn(getDISubprogram(Scope));
+ StringRef FName = "fn";
+ if (Fn.getFunction())
+ FName = Fn.getFunction()->getName();
+ char One = '\1';
+ if (FName.startswith(StringRef(&One, 1)))
+ FName = FName.substr(1);
+ NamedMDNode *FnLocals = getOrInsertFnSpecificMDNode(M, FName);
+ FnLocals->addOperand(Node);
+ }
+ return DIVariable(Node);
+}
+
/// CreateComplexVariable - Create a new descriptor for the specified variable
/// which has a complex address expression for its address.
DIVariable DIBuilder::CreateComplexVariable(unsigned Tag, DIDescriptor Scope,