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llvm-project/clang/test/CodeGenObjC/stret-lifetime.m

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[objc] Don't require null-check and don't emit memset when result is ignored for struct-returning method calls [clang part] This fixes an issue with the emission of lifetime markers for struct-returning Obj-C msgSend calls. When the result of a struct-returning call is ignored, the temporary storage is only marked with lifetime markers in one of the two branches of the nil-receiver-check. The check is, however, not required when the result is unused. If we still need to emit the check (due to consumer arguments), let's not emit the memset to zero out the result if it's unused. This fixes a use-after-scope false positive with AddressSanitizer. Differential Revision: https://reviews.llvm.org/D34834 llvm-svn: 306837
2017-07-01 00:28:15 +08:00
// RUN: %clang_cc1 -triple arm64-apple-darwin -S -emit-llvm -o - -O2 -disable-llvm-passes %s | FileCheck %s
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -S -emit-llvm -o - -O2 -disable-llvm-passes %s | FileCheck %s
// RUN: %clang_cc1 -triple arm64-apple-darwin -fobjc-arc -S -emit-llvm -o - -O2 -disable-llvm-passes %s | FileCheck %s --check-prefixes=CHECK,ARC
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -fobjc-arc -S -emit-llvm -o - -O2 -disable-llvm-passes %s | FileCheck %s --check-prefixes=CHECK,ARC
struct stret { int x[100]; };
struct stret one = {{1}};
@interface Test
+(struct stret) method;
+(struct stret) methodConsuming:(id __attribute__((ns_consumed)))consumed;
@end
void foo(id o, id p) {
[o method];
// CHECK: @llvm.lifetime.start
// CHECK: call void bitcast {{.*}} @objc_msgSend
// CHECK: @llvm.lifetime.end
// CHECK-NOT: call void @llvm.memset
[o methodConsuming:p];
// ARC: [[T0:%.*]] = icmp eq i8*
// ARC: br i1 [[T0]]
// CHECK: @llvm.lifetime.start
// CHECK: call void bitcast {{.*}} @objc_msgSend
// CHECK: @llvm.lifetime.end
// ARC: br label
Generate objc intrinsics instead of runtime calls as the ARC optimizer now works only on intrinsics Differential Revision: https://reviews.llvm.org/D55802 Reviewers: rjmccall llvm-svn: 349535
2018-12-19 04:33:00 +08:00
// ARC: call void @llvm.objc.release
[objc] Don't require null-check and don't emit memset when result is ignored for struct-returning method calls [clang part] This fixes an issue with the emission of lifetime markers for struct-returning Obj-C msgSend calls. When the result of a struct-returning call is ignored, the temporary storage is only marked with lifetime markers in one of the two branches of the nil-receiver-check. The check is, however, not required when the result is unused. If we still need to emit the check (due to consumer arguments), let's not emit the memset to zero out the result if it's unused. This fixes a use-after-scope false positive with AddressSanitizer. Differential Revision: https://reviews.llvm.org/D34834 llvm-svn: 306837
2017-07-01 00:28:15 +08:00
// ARC: br label
// CHECK-NOT: call void @llvm.memset
}