Lift up call site emission conditions check

Author: jryans

clang/lib/CodeGen/CGCall.cpp

@@ -38,6 +38,7 @@
 #include "llvm/IR/Attributes.h"
 #include "llvm/IR/CallingConv.h"
 #include "llvm/IR/DataLayout.h"
+#include "llvm/IR/DebugInfoMetadata.h"
 #include "llvm/IR/InlineAsm.h"
 #include "llvm/IR/IntrinsicInst.h"
 #include "llvm/IR/Intrinsics.h"
@@ -6277,10 +6278,13 @@ RValue CodeGenFunction::EmitCall(const CGFunctionInfo &CallInfo,
     pushDestroy(QualType::DK_nontrivial_c_struct, Ret.getAggregateAddress(),
                 RetTy);
 
-  if (CalleeDecl) {
-    // Generate function declaration DISuprogram in order to be used
-    // in debug info about call sites.
-    if (CGDebugInfo *DI = getDebugInfo()) {
+  // Generate function declaration DISuprogram in order to be used
+  // in debug info about call sites.
+  if (CGDebugInfo *DI = getDebugInfo()) {
+    // Ensure call site info would actually be emitted before collecting
+    // further callee info.
+    if (CalleeDecl && !CalleeDecl->hasAttr<NoDebugAttr>() &&
+        DI->getCallSiteRelatedAttrs() != llvm::DINode::FlagZero) {
       CodeGenFunction CalleeCGF(CGM);
       const GlobalDecl &CalleeGlobalDecl =
           Callee.getAbstractInfo().getCalleeDecl();

clang/lib/CodeGen/CGDebugInfo.h

@@ -678,6 +678,10 @@ class CGDebugInfo {
   /// Emit symbol for debugger that holds the pointer to the vtable.
   void emitVTableSymbol(llvm::GlobalVariable *VTable, const CXXRecordDecl *RD);
 
+  /// Return flags which enable debug info emission for call sites, provided
+  /// that it is supported and enabled.
+  llvm::DINode::DIFlags getCallSiteRelatedAttrs() const;
+
 private:
   /// Amend \p I's DebugLoc with \p Group (its source atom group) and \p
   /// Rank (lower nonzero rank is higher precedence). Does nothing if \p I
@@ -828,10 +832,6 @@ class CGDebugInfo {
                          llvm::GlobalVariable *Var, llvm::DIScope *DContext);
 
 
-  /// Return flags which enable debug info emission for call sites, provided
-  /// that it is supported and enabled.
-  llvm::DINode::DIFlags getCallSiteRelatedAttrs() const;
-
   /// Get the printing policy for producing names for debug info.
   PrintingPolicy getPrintingPolicy() const;