Fix crash with interrupt attribute on ARM.

An indirect call has no associated function declaration.

llvm-svn: 297694

2 files changed, 6 insertions, 1 deletions

diff --git a/clang/lib/Sema/SemaExpr.cpp b/clang/lib/Sema/SemaExpr.cpp
index 88f32bb6b3b..c5b2e1b3a25 100644
--- a/clang/lib/Sema/SemaExpr.cpp
+++ b/clang/lib/Sema/SemaExpr.cpp
@@ -5387,7 +5387,7 @@ Sema::BuildResolvedCallExpr(Expr *Fn, NamedDecl *NDecl,
   // but can be very challenging to debug.
   if (auto *Caller = getCurFunctionDecl())
     if (Caller->hasAttr<ARMInterruptAttr>())
-      if (!FDecl->hasAttr<ARMInterruptAttr>())
+      if (!FDecl || !FDecl->hasAttr<ARMInterruptAttr>())
         Diag(Fn->getExprLoc(), diag::warn_arm_interrupt_calling_convention);
 
   // Promote the function operand.
diff --git a/clang/test/Sema/arm-interrupt-attr.c b/clang/test/Sema/arm-interrupt-attr.c
index cd67278d944..3a6cdbe0e07 100644
--- a/clang/test/Sema/arm-interrupt-attr.c
+++ b/clang/test/Sema/arm-interrupt-attr.c
@@ -28,3 +28,8 @@ __attribute__((interrupt("IRQ"))) void caller2() {
   callee1(); // expected-warning {{call to function without interrupt attribute could clobber interruptee's VFP registers}}
   callee2();
 }
+
+void (*callee3)();
+__attribute__((interrupt("IRQ"))) void caller3() {
+  callee3(); // expected-warning {{call to function without interrupt attribute could clobber interruptee's VFP registers}}
+}