CodeGen: ensure that the runtime calling convention matches

Incorrect specification of the calling convention results in UB which can cause
the code path to be eliminated.  Simplify the existing code by using the
RuntimeCall constructor in `CodeGenFunction`.

llvm-svn: 284154

2 files changed, 32 insertions, 12 deletions

diff --git a/clang/lib/CodeGen/CGObjCRuntime.cpp b/clang/lib/CodeGen/CGObjCRuntime.cpp
index ebc829272e7..3da7ed230ed 100644
--- a/clang/lib/CodeGen/CGObjCRuntime.cpp
+++ b/clang/lib/CodeGen/CGObjCRuntime.cpp
@@ -150,18 +150,16 @@ namespace {
   };
 
   struct CallObjCEndCatch final : EHScopeStack::Cleanup {
-    CallObjCEndCatch(bool MightThrow, llvm::Value *Fn) :
-      MightThrow(MightThrow), Fn(Fn) {}
+    CallObjCEndCatch(bool MightThrow, llvm::Value *Fn)
+        : MightThrow(MightThrow), Fn(Fn) {}
     bool MightThrow;
     llvm::Value *Fn;
 
     void Emit(CodeGenFunction &CGF, Flags flags) override {
-      if (!MightThrow) {
-        CGF.Builder.CreateCall(Fn)->setDoesNotThrow();
-        return;
-      }
-
-      CGF.EmitRuntimeCallOrInvoke(Fn);
+      if (MightThrow)
+        CGF.EmitRuntimeCallOrInvoke(Fn);
+      else
+        CGF.EmitNounwindRuntimeCall(Fn);
     }
   };
 }
@@ -230,10 +228,8 @@ void CGObjCRuntime::EmitTryCatchStmt(CodeGenFunction &CGF,
 
     // Enter the catch.
     llvm::Value *Exn = RawExn;
-    if (beginCatchFn) {
-      Exn = CGF.Builder.CreateCall(beginCatchFn, RawExn, "exn.adjusted");
-      cast<llvm::CallInst>(Exn)->setDoesNotThrow();
-    }
+    if (beginCatchFn)
+      Exn = CGF.EmitNounwindRuntimeCall(beginCatchFn, RawExn, "exn.adjusted");
 
     CodeGenFunction::LexicalScope cleanups(CGF, Handler.Body->getSourceRange());
 
diff --git a/clang/test/CodeGenObjC/runtime-abi-match.m b/clang/test/CodeGenObjC/runtime-abi-match.m
new file mode 100644
index 00000000000..818f5ad53ee
--- /dev/null
+++ b/clang/test/CodeGenObjC/runtime-abi-match.m
@@ -0,0 +1,24 @@
+// RUN: %clang -target armv7-windows -fobjc-runtime=ios -O1 -fexceptions -S -emit-llvm %s -o - | FileCheck %s
+
+void (*f)(id);
+void (*g)(void);
+void h(void);
+
+@interface NSNumber
++ (NSNumber *)numberWithInt:(int)i;
+@end
+
+void i(void) {
+  @try {
+    @throw(@1);
+  } @catch (id i) {
+    (*f)(i);
+    (*g)();
+  }
+}
+
+// CHECK: call arm_aapcs_vfpcc i8* @objc_begin_catch
+// CHECK: call arm_aapcs_vfpcc void @objc_end_catch
+// CHECK-NOT: call i8* @objc_begin_catch
+// CHECK-NOT: call void @objc_end_catch
+