1 // RUN: %clang_cc1 -emit-llvm -triple x86_64-unknown-linux-gnu -O2 -o - %s | FileCheck -check-prefix=NULL-POINTER-INVALID %s 2 // RUN: %clang_cc1 -emit-llvm -triple x86_64-unknown-linux-gnu -O2 -o - %s -fno-delete-null-pointer-checks | FileCheck -check-prefix=NULL-POINTER-VALID %s 3 4 // Test that clang does not remove the null pointer check with 5 // -fno-delete-null-pointer-checks. 6 int null_check(int *P) { 7 // NULL-POINTER-VALID: %[[TOBOOL:.*]] = icmp eq i32* %P, null 8 // NULL-POINTER-INVALID-NOT: icmp eq 9 // NULL-POINTER-VALID: %[[SEL:.*]] = select i1 %[[TOBOOL:.*]], i32* null, i32* 10 // NULL-POINTER-INVALID-NOT: select i1 11 // NULL-POINTER-VALID: load i32, i32* %[[SEL:.*]] 12 int *Q = P; 13 if (P) { 14 Q = P + 2; 15 } 16 return *Q; 17 } 18 19 // NULL-POINTER-INVALID-NOT: attributes #0 = {{.*}} "null-pointer-is-valid"="true" 20 // NULL-POINTER-VALID: attributes #0 = {{.*}} "null-pointer-is-valid"="true" 21