Teach clang to add metadata tags to calls and invokes in ObjC with

-fno-objc-arc-exceptions. This will allow the optimizer to perform
optimizations which are only safe under that flag.

This is a part of rdar://10803830.

llvm-svn: 150644

1 files changed, 78 insertions, 0 deletions

diff --git a/clang/test/CodeGenObjC/arc-no-arc-exceptions.m b/clang/test/CodeGenObjC/arc-no-arc-exceptions.m
new file mode 100644
index 00000000000..d03a0c9322f
--- /dev/null
+++ b/clang/test/CodeGenObjC/arc-no-arc-exceptions.m
@@ -0,0 +1,78 @@
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -fobjc-arc -fblocks -fexceptions -fobjc-exceptions -O2 -disable-llvm-optzns -o - %s | FileCheck %s
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -fobjc-arc -fblocks -fexceptions -fobjc-exceptions -O0 -disable-llvm-optzns -o - %s | FileCheck -check-prefix=NO-METADATA %s
+// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -fobjc-arc -fblocks -fexceptions -fobjc-exceptions -O2 -disable-llvm-optzns -o - %s -fobjc-arc-exceptions | FileCheck -check-prefix=NO-METADATA %s
+
+// The front-end should emit clang.arc.no_objc_arc_exceptions in -fobjc-arc-exceptions
+// mode when optimization is enabled, and not otherwise.
+
+void thrower(void);
+void not(void) __attribute__((nothrow));
+
+// CHECK: define void @test0(
+// CHECK: call void @thrower(), !clang.arc.no_objc_arc_exceptions !0
+// CHECK: call void @not() nounwind, !clang.arc.no_objc_arc_exceptions !0
+// NO-METADATA: define void @test0(
+// NO-METADATA-NOT: !clang.arc.no_objc_arc_exceptions
+// NO-METADATA: }
+void test0(void) {
+  thrower();
+  not();
+}
+
+// CHECK: define void @test1(
+// CHECK: call void @thrower(), !clang.arc.no_objc_arc_exceptions !0
+// CHECK: call void @not() nounwind, !clang.arc.no_objc_arc_exceptions !0
+// NO-METADATA: define void @test1(
+// NO-METADATA-NOT: !clang.arc.no_objc_arc_exceptions
+// NO-METADATA: }
+void test1(id x) {
+  id y = x;
+  thrower();
+  not();
+}
+
+void NSLog(id, ...);
+
+// CHECK: define void @test2(
+// CHECK: invoke void (i8*, ...)* @NSLog(i8* bitcast (%struct.NSConstantString* @_unnamed_cfstring_ to i8*), i32* %x2)
+// CHECK:   to label %invoke.cont unwind label %lpad, !clang.arc.no_objc_arc_exceptions !0
+// NO-METADATA: define void @test2(
+// NO-METADATA-NOT: !clang.arc.no_objc_arc_exceptions
+// NO-METADATA: }
+void test2(void) {
+    @autoreleasepool {
+        __attribute__((__blocks__(byref))) int x;
+        NSLog(@"Address of x outside of block: %p", &x);
+    }
+}
+
+// CHECK: define void @test3(
+// CHECK: invoke void %9(i8* %7)
+// CHECK:   to label %invoke.cont unwind label %lpad, !clang.arc.no_objc_arc_exceptions !0
+// NO-METADATA: define void @test3(
+// NO-METADATA-NOT: !clang.arc.no_objc_arc_exceptions
+// NO-METADATA: }
+void test3(void) {
+    @autoreleasepool {
+        __attribute__((__blocks__(byref))) int x;
+        ^{
+            NSLog(@"Address of x in non-assigned block: %p", &x);
+        }();
+    }
+}
+
+// CHECK: define void @test4(
+// CHECK: invoke void %13(i8* %11)
+// CHECK:   to label %invoke.cont unwind label %lpad, !clang.arc.no_objc_arc_exceptions !0
+// NO-METADATA: define void @test4(
+// NO-METADATA-NOT: !clang.arc.no_objc_arc_exceptions
+// NO-METADATA: }
+void test4(void) {
+    @autoreleasepool {
+        __attribute__((__blocks__(byref))) int x;
+        void (^b)(void) = ^{
+            NSLog(@"Address of x in assigned block: %p", &x);
+        };
+        b();
+    }
+}