[clang] [clang][bytecode] Fix lookup in source locations in implicit ctors (PR #107992)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Timm Baeder (tbaederr)

<details>
<summary>Changes</summary>

Implicit functions may still have a body. The !hasBody() check is enough.

---
Full diff: https://github.com/llvm/llvm-project/pull/107992.diff


2 Files Affected:

- (modified) clang/lib/AST/ByteCode/InterpFrame.cpp (+5-5) 
- (modified) clang/test/AST/ByteCode/builtin-functions.cpp (+7) 


``````````diff
diff --git a/clang/lib/AST/ByteCode/InterpFrame.cpp b/clang/lib/AST/ByteCode/InterpFrame.cpp
index 6830a7b37f1da5..6c1e446458dc57 100644
--- a/clang/lib/AST/ByteCode/InterpFrame.cpp
+++ b/clang/lib/AST/ByteCode/InterpFrame.cpp
@@ -210,28 +210,28 @@ Pointer InterpFrame::getParamPointer(unsigned Off) {
 SourceInfo InterpFrame::getSource(CodePtr PC) const {
   // Implicitly created functions don't have any code we could point at,
   // so return the call site.
-  if (Func && (!Func->hasBody() || Func->getDecl()->isImplicit()) && Caller)
+  if (Func && !Func->hasBody() && Caller)
     return Caller->getSource(RetPC);
 
   return S.getSource(Func, PC);
 }
 
 const Expr *InterpFrame::getExpr(CodePtr PC) const {
-  if (Func && (!Func->hasBody() || Func->getDecl()->isImplicit()) && Caller)
-    return Caller->getExpr(RetPC);
+  if (Func && !Func->hasBody() && Caller)
+    return Caller->getExpr(PC);
 
   return S.getExpr(Func, PC);
 }
 
 SourceLocation InterpFrame::getLocation(CodePtr PC) const {
-  if (Func && (!Func->hasBody() || Func->getDecl()->isImplicit()) && Caller)
+  if (Func && !Func->hasBody() && Caller)
     return Caller->getLocation(RetPC);
 
   return S.getLocation(Func, PC);
 }
 
 SourceRange InterpFrame::getRange(CodePtr PC) const {
-  if (Func && (!Func->hasBody() || Func->getDecl()->isImplicit()) && Caller)
+  if (Func && !Func->hasBody() && Caller)
     return Caller->getRange(RetPC);
 
   return S.getRange(Func, PC);
diff --git a/clang/test/AST/ByteCode/builtin-functions.cpp b/clang/test/AST/ByteCode/builtin-functions.cpp
index 9c9ca23e0a6a69..9fd5eae67a21f6 100644
--- a/clang/test/AST/ByteCode/builtin-functions.cpp
+++ b/clang/test/AST/ByteCode/builtin-functions.cpp
@@ -968,3 +968,10 @@ namespace FunctionStart {
   static_assert(__builtin_function_start(a) == a, ""); // both-error {{not an integral constant expression}} \
                                                        // both-note {{comparison of addresses of literals has unspecified value}}
 }
+
+namespace BuiltinInImplicitCtor {
+  constexpr struct {
+    int a = __builtin_isnan(1.0);
+  } Foo;
+  static_assert(Foo.a == 0, "");
+}

``````````

</details>


https://github.com/llvm/llvm-project/pull/107992