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llvm-project/clang/test/CodeGen/catch-undef-behavior.c

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// RUN: %clang_cc1 -fsanitize=alignment,null,object-size,shift-base,shift-exponent,return,signed-integer-overflow,vla-bound,float-cast-overflow,integer-divide-by-zero,bool,returns-nonnull-attribute,nonnull-attribute -fsanitize-recover=alignment,null,object-size,shift-base,shift-exponent,signed-integer-overflow,vla-bound,float-cast-overflow,integer-divide-by-zero,bool,returns-nonnull-attribute,nonnull-attribute -emit-llvm %s -o - -triple x86_64-linux-gnu | opt -instnamer -S | FileCheck %s --check-prefix=CHECK-COMMON --check-prefix=CHECK-UBSAN
// RUN: %clang_cc1 -fsanitize-trap=alignment,null,object-size,shift-base,shift-exponent,return,signed-integer-overflow,vla-bound,float-cast-overflow,integer-divide-by-zero,bool,returns-nonnull-attribute,nonnull-attribute -fsanitize-recover=alignment,null,object-size,shift-base,shift-exponent,signed-integer-overflow,vla-bound,float-cast-overflow,integer-divide-by-zero,bool,returns-nonnull-attribute,nonnull-attribute -fsanitize=alignment,null,object-size,shift-base,shift-exponent,return,signed-integer-overflow,vla-bound,float-cast-overflow,integer-divide-by-zero,bool,returns-nonnull-attribute,nonnull-attribute -fsanitize-recover=alignment,null,object-size,shift-base,shift-exponent,signed-integer-overflow,vla-bound,float-cast-overflow,integer-divide-by-zero,bool,returns-nonnull-attribute,nonnull-attribute -emit-llvm %s -o - -triple x86_64-linux-gnu | opt -instnamer -S | FileCheck %s --check-prefix=CHECK-COMMON --check-prefix=CHECK-TRAP
// RUN: %clang_cc1 -fsanitize=signed-integer-overflow -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s --check-prefix=CHECK-OVERFLOW
// CHECK-UBSAN: @[[INT:.*]] = private unnamed_addr constant { i16, i16, [6 x i8] } { i16 0, i16 11, [6 x i8] c"'int'\00" }
// FIXME: When we only emit each type once, use [[INT]] more below.
// CHECK-UBSAN: @[[LINE_100:.*]] = private unnamed_addr global {{.*}}, i32 100, i32 5 {{.*}} @[[INT]], i8 2, i8 1
// CHECK-UBSAN: @[[LINE_200:.*]] = {{.*}}, i32 200, i32 10 {{.*}}, i8 2, i8 0
// CHECK-UBSAN: @[[LINE_300:.*]] = {{.*}}, i32 300, i32 12 {{.*}} @{{.*}}, {{.*}} @{{.*}}
// CHECK-UBSAN: @[[LINE_400:.*]] = {{.*}}, i32 400, i32 12 {{.*}} @{{.*}}, {{.*}} @{{.*}}
// CHECK-UBSAN: @[[LINE_500:.*]] = {{.*}}, i32 500, i32 10 {{.*}} @{{.*}}, i8 2, i8 0 }
// CHECK-UBSAN: @[[LINE_600:.*]] = {{.*}}, i32 600, i32 3 {{.*}} @{{.*}}, i8 2, i8 1 }
// CHECK-UBSAN: @[[STRUCT_S:.*]] = private unnamed_addr constant { i16, i16, [11 x i8] } { i16 -1, i16 0, [11 x i8] c"'struct S'\00" }
// CHECK-UBSAN: @[[LINE_700:.*]] = {{.*}}, i32 700, i32 14 {{.*}} @[[STRUCT_S]], i8 2, i8 3 }
// CHECK-UBSAN: @[[LINE_800:.*]] = {{.*}}, i32 800, i32 12 {{.*}} @{{.*}} }
// CHECK-UBSAN: @[[LINE_900:.*]] = {{.*}}, i32 900, i32 11 {{.*}} @{{.*}} }
// CHECK-UBSAN: @[[LINE_1000:.*]] = {{.*}}, i32 1000, i32 11 {{.*}} @{{.*}} }
// CHECK-UBSAN: @[[FP16:.*]] = private unnamed_addr constant { i16, i16, [9 x i8] } { i16 1, i16 16, [9 x i8] c"'__fp16'\00" }
// CHECK-UBSAN: @[[LINE_1200:.*]] = {{.*}}, i32 1200, i32 10 {{.*}} @{{.*}} }
// CHECK-UBSAN: @[[LINE_1300:.*]] = {{.*}}, i32 1300, i32 10 {{.*}} @{{.*}} }
// CHECK-UBSAN: @[[LINE_1400:.*]] = {{.*}}, i32 1400, i32 10 {{.*}} @{{.*}} }
// Make sure we check the fp16 type_mismatch data so we can easily match the signed char float_cast_overflow
// CHECK-UBSAN: @[[LINE_1500:.*]] = {{.*}}, i32 1500, i32 10 {{.*}} @[[FP16]], {{.*}} }
// CHECK-UBSAN: @[[SCHAR:.*]] = private unnamed_addr constant { i16, i16, [14 x i8] } { i16 0, i16 7, [14 x i8] c"'signed char'\00" }
// CHECK-UBSAN: @[[LINE_1500:.*]] = {{.*}}, i32 1500, i32 10 {{.*}} @[[FP16]], {{.*}} }
// PR6805
// CHECK-COMMON-LABEL: @foo
void foo(void) {
union { int i; } u;
// CHECK-COMMON: %[[I8PTR:.*]] = bitcast i32* %[[PTR:.*]] to i8*
// CHECK-COMMON-NEXT: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64.p0i8(i8* %[[I8PTR]], i1 false, i1 false, i1 false)
// CHECK-COMMON-NEXT: %[[OK:.*]] = icmp uge i64 %[[SIZE]], 4
// CHECK-UBSAN: br i1 %[[OK]], {{.*}} !prof ![[WEIGHT_MD:.*]], !nosanitize
// CHECK-TRAP: br i1 %[[OK]], {{.*}}
// CHECK-UBSAN: %[[ARG:.*]] = ptrtoint {{.*}} %[[PTR]] to i64
// CHECK-UBSAN-NEXT: call void @__ubsan_handle_type_mismatch_v1(i8* bitcast ({{.*}} @[[LINE_100]] to i8*), i64 %[[ARG]])
// CHECK-TRAP: call void @llvm.ubsantrap(i8 22) [[NR_NUW:#[0-9]+]]
// CHECK-TRAP-NEXT: unreachable
#line 100
u.i=1;
}
// CHECK-COMMON-LABEL: @bar
int bar(int *a) {
// CHECK-COMMON: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64
// CHECK-COMMON-NEXT: icmp uge i64 %[[SIZE]], 4
// CHECK-COMMON: %[[PTRINT:.*]] = ptrtoint
// CHECK-COMMON-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 3
// CHECK-COMMON-NEXT: icmp eq i64 %[[MISALIGN]], 0
// CHECK-UBSAN: call void @__ubsan_handle_type_mismatch_v1(i8* bitcast ({{.*}} @[[LINE_200]] to i8*), i64 %[[PTRINT]])
// CHECK-TRAP: call void @llvm.ubsantrap(i8 22) [[NR_NUW]]
// CHECK-TRAP-NEXT: unreachable
#line 200
return *a;
}
// CHECK-UBSAN-LABEL: @addr_space
int addr_space(int __attribute__((address_space(256))) *a) {
// CHECK-UBSAN-NOT: __ubsan
return *a;
}
// CHECK-COMMON-LABEL: @lsh_overflow
int lsh_overflow(int a, int b) {
// CHECK-COMMON: %[[RHS_INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31
// CHECK-COMMON-NEXT: br i1 %[[RHS_INBOUNDS]], label %[[CHECK_BB:.*]], label %[[CONT_BB:.*]],
// CHECK-COMMON: [[CHECK_BB]]:
// CHECK-COMMON-NEXT: %[[SHIFTED_OUT_WIDTH:.*]] = sub nuw nsw i32 31, %[[RHS]]
// CHECK-COMMON-NEXT: %[[SHIFTED_OUT:.*]] = lshr i32 %[[LHS:.*]], %[[SHIFTED_OUT_WIDTH]]
// CHECK-COMMON-NEXT: %[[NO_OVERFLOW:.*]] = icmp eq i32 %[[SHIFTED_OUT]], 0
// CHECK-COMMON-NEXT: br label %[[CONT_BB]]
// CHECK-COMMON: [[CONT_BB]]:
// CHECK-COMMON-NEXT: %[[VALID_BASE:.*]] = phi i1 [ true, {{.*}} ], [ %[[NO_OVERFLOW]], %[[CHECK_BB]] ]
// CHECK-COMMON-NEXT: %[[VALID:.*]] = and i1 %[[RHS_INBOUNDS]], %[[VALID_BASE]]
// CHECK-UBSAN: br i1 %[[VALID]], {{.*}} !prof ![[WEIGHT_MD]]
// CHECK-TRAP: br i1 %[[VALID]]
// CHECK-UBSAN: %[[ARG1:.*]] = zext
// CHECK-UBSAN-NEXT: %[[ARG2:.*]] = zext
// CHECK-UBSAN-NEXT: call void @__ubsan_handle_shift_out_of_bounds(i8* bitcast ({{.*}} @[[LINE_300]] to i8*), i64 %[[ARG1]], i64 %[[ARG2]])
// CHECK-UBSAN-NOT: call void @__ubsan_handle_shift_out_of_bounds
// CHECK-TRAP: call void @llvm.ubsantrap(i8 20) [[NR_NUW]]
// CHECK-TRAP: unreachable
// CHECK-TRAP-NOT: call void @llvm.ubsantrap
// CHECK-COMMON: %[[RET:.*]] = shl i32 %[[LHS]], %[[RHS]]
// CHECK-COMMON-NEXT: ret i32 %[[RET]]
#line 300
return a << b;
}
// CHECK-COMMON-LABEL: @rsh_inbounds
int rsh_inbounds(int a, int b) {
// CHECK-COMMON: %[[INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31
// CHECK-COMMON: br i1 %[[INBOUNDS]]
// CHECK-UBSAN: %[[ARG1:.*]] = zext
// CHECK-UBSAN-NEXT: %[[ARG2:.*]] = zext
// CHECK-UBSAN-NEXT: call void @__ubsan_handle_shift_out_of_bounds(i8* bitcast ({{.*}} @[[LINE_400]] to i8*), i64 %[[ARG1]], i64 %[[ARG2]])
// CHECK-TRAP: call void @llvm.ubsantrap(i8 20) [[NR_NUW]]
// CHECK-TRAP-NEXT: unreachable
// CHECK-COMMON: %[[RET:.*]] = ashr i32 {{.*}}, %[[RHS]]
// CHECK-COMMON-NEXT: ret i32 %[[RET]]
#line 400
return a >> b;
}
// CHECK-COMMON-LABEL: @load
int load(int *p) {
// CHECK-UBSAN: call void @__ubsan_handle_type_mismatch_v1(i8* bitcast ({{.*}} @[[LINE_500]] to i8*), i64 %{{.*}})
// CHECK-TRAP: call void @llvm.ubsantrap(i8 22) [[NR_NUW]]
// CHECK-TRAP-NEXT: unreachable
#line 500
return *p;
}
// CHECK-COMMON-LABEL: @store
void store(int *p, int q) {
// CHECK-UBSAN: call void @__ubsan_handle_type_mismatch_v1(i8* bitcast ({{.*}} @[[LINE_600]] to i8*), i64 %{{.*}})
// CHECK-TRAP: call void @llvm.ubsantrap(i8 22) [[NR_NUW]]
// CHECK-TRAP-NEXT: unreachable
#line 600
*p = q;
}
struct S { int k; };
// CHECK-COMMON-LABEL: @member_access
int *member_access(struct S *p) {
// CHECK-UBSAN: call void @__ubsan_handle_type_mismatch_v1(i8* bitcast ({{.*}} @[[LINE_700]] to i8*), i64 %{{.*}})
// CHECK-TRAP: call void @llvm.ubsantrap(i8 22) [[NR_NUW]]
// CHECK-TRAP-NEXT: unreachable
#line 700
return &p->k;
}
// CHECK-COMMON-LABEL: @signed_overflow
int signed_overflow(int a, int b) {
// CHECK-UBSAN: %[[ARG1:.*]] = zext
// CHECK-UBSAN-NEXT: %[[ARG2:.*]] = zext
// CHECK-UBSAN-NEXT: call void @__ubsan_handle_add_overflow(i8* bitcast ({{.*}} @[[LINE_800]] to i8*), i64 %[[ARG1]], i64 %[[ARG2]])
// CHECK-TRAP: call void @llvm.ubsantrap(i8 0) [[NR_NUW]]
// CHECK-TRAP-NEXT: unreachable
#line 800
return a + b;
}
// CHECK-COMMON-LABEL: @no_return
int no_return(void) {
// Reaching the end of a noreturn function is fine in C.
// FIXME: If the user explicitly requests -fsanitize=return, we should catch
// that here even though it's not undefined behavior.
// CHECK-COMMON-NOT: call
// CHECK-COMMON-NOT: unreachable
// CHECK-COMMON: ret i32
}
// CHECK-UBSAN-LABEL: @vla_bound
void vla_bound(int n) {
// CHECK-UBSAN: icmp sgt i32 %[[PARAM:.*]], 0
//
// CHECK-UBSAN: %[[ARG:.*]] = zext i32 %[[PARAM]] to i64
// CHECK-UBSAN-NEXT: call void @__ubsan_handle_vla_bound_not_positive(i8* bitcast ({{.*}} @[[LINE_900]] to i8*), i64 %[[ARG]])
#line 900
int arr[n * 3];
}
// CHECK-UBSAN-LABEL: @vla_bound_unsigned
void vla_bound_unsigned(unsigned int n) {
// CHECK-UBSAN: icmp ugt i32 %[[PARAM:.*]], 0
//
// CHECK-UBSAN: %[[ARG:.*]] = zext i32 %[[PARAM]] to i64
// CHECK-UBSAN-NEXT: call void @__ubsan_handle_vla_bound_not_positive(i8* bitcast ({{.*}} @[[LINE_1000]] to i8*), i64 %[[ARG]])
#line 1000
int arr[n * 3];
}
// CHECK-UBSAN-LABEL: @int_float_no_overflow
float int_float_no_overflow(__int128 n) {
// CHECK-UBSAN-NOT: call void @__ubsan_handle
return n;
}
// CHECK-COMMON-LABEL: @int_float_overflow
float int_float_overflow(unsigned __int128 n) {
// CHECK-UBSAN-NOT: call {{.*}} @__ubsan_handle_float_cast_overflow(
// CHECK-TRAP-NOT: call {{.*}} @llvm.trap(
// CHECK-COMMON: }
return n;
}
// CHECK-COMMON-LABEL: @int_fp16_overflow
void int_fp16_overflow(int n, __fp16 *p) {
// CHECK-UBSAN-NOT: call {{.*}} @__ubsan_handle_float_cast_overflow(
// CHECK-COMMON: }
*p = n;
}
// CHECK-COMMON-LABEL: @float_int_overflow
int float_int_overflow(float f) {
// CHECK-COMMON: %[[GE:.*]] = fcmp ogt float %[[F:.*]], 0xC1E0000020000000
// CHECK-COMMON: %[[LE:.*]] = fcmp olt float %[[F]], 0x41E0000000000000
// CHECK-COMMON: %[[INBOUNDS:.*]] = and i1 %[[GE]], %[[LE]]
// CHECK-COMMON-NEXT: br i1 %[[INBOUNDS]]
// CHECK-UBSAN: %[[CAST:.*]] = bitcast float %[[F]] to i32
// CHECK-UBSAN: %[[ARG:.*]] = zext i32 %[[CAST]] to i64
// CHECK-UBSAN: call void @__ubsan_handle_float_cast_overflow(i8* bitcast ({{.*}} @[[LINE_1200]] to i8*), i64 %[[ARG]]
// CHECK-TRAP: call void @llvm.ubsantrap(i8 5) [[NR_NUW]]
// CHECK-TRAP-NEXT: unreachable
#line 1200
return f;
}
// CHECK-COMMON-LABEL: @long_double_int_overflow
int long_double_int_overflow(long double ld) {
// CHECK-UBSAN: alloca x86_fp80
// CHECK-COMMON: %[[GE:.*]] = fcmp ogt x86_fp80 %[[F:.*]], 0xKC01E800000010000000
// CHECK-COMMON: %[[LE:.*]] = fcmp olt x86_fp80 %[[F]], 0xK401E800000000000000
// CHECK-COMMON: %[[INBOUNDS:.*]] = and i1 %[[GE]], %[[LE]]
// CHECK-COMMON-NEXT: br i1 %[[INBOUNDS]]
// CHECK-UBSAN: store x86_fp80 %[[F]], x86_fp80* %[[ALLOCA:.*]], align 16, !nosanitize
// CHECK-UBSAN: %[[ARG:.*]] = ptrtoint x86_fp80* %[[ALLOCA]] to i64
// CHECK-UBSAN: call void @__ubsan_handle_float_cast_overflow(i8* bitcast ({{.*}} @[[LINE_1300]] to i8*), i64 %[[ARG]]
// CHECK-TRAP: call void @llvm.ubsantrap(i8 5) [[NR_NUW]]
// CHECK-TRAP-NEXT: unreachable
#line 1300
return ld;
}
// CHECK-COMMON-LABEL: @float_uint_overflow
unsigned float_uint_overflow(float f) {
// CHECK-COMMON: %[[GE:.*]] = fcmp ogt float %[[F:.*]], -1.{{0*}}e+00
// CHECK-COMMON: %[[LE:.*]] = fcmp olt float %[[F]], 0x41F0000000000000
// CHECK-COMMON: %[[INBOUNDS:.*]] = and i1 %[[GE]], %[[LE]]
// CHECK-COMMON-NEXT: br i1 %[[INBOUNDS]]
// CHECK-UBSAN: call void @__ubsan_handle_float_cast_overflow(i8* bitcast ({{.*}} @[[LINE_1400]] to i8*),
// CHECK-TRAP: call void @llvm.ubsantrap(i8 5) [[NR_NUW]]
// CHECK-TRAP-NEXT: unreachable
#line 1400
return f;
}
// CHECK-COMMON-LABEL: @fp16_char_overflow
signed char fp16_char_overflow(__fp16 *p) {
// CHECK-COMMON: %[[GE:.*]] = fcmp ogt float %[[F:.*]], -1.29{{0*}}e+02
// CHECK-COMMON: %[[LE:.*]] = fcmp olt float %[[F]], 1.28{{0*}}e+02
// CHECK-COMMON: %[[INBOUNDS:.*]] = and i1 %[[GE]], %[[LE]]
// CHECK-COMMON-NEXT: br i1 %[[INBOUNDS]]
// CHECK-UBSAN: call void @__ubsan_handle_float_cast_overflow(i8* bitcast ({{.*}} @[[LINE_1500]] to i8*),
// CHECK-TRAP: call void @llvm.ubsantrap(i8 5) [[NR_NUW]]
// CHECK-TRAP-NEXT: unreachable
#line 1500
return *p;
}
// CHECK-COMMON-LABEL: @float_float_overflow
float float_float_overflow(double f) {
// CHECK-UBSAN-NOT: call {{.*}} @__ubsan_handle_float_cast_overflow(
// CHECK-TRAP-NOT: call {{.*}} @llvm.ubsantrap(i8 19) [[NR_NUW]]
// CHECK-COMMON: }
return f;
}
// CHECK-COMMON-LABEL: @int_divide_overflow
// CHECK-OVERFLOW-LABEL: @int_divide_overflow
int int_divide_overflow(int a, int b) {
// CHECK-COMMON: %[[ZERO:.*]] = icmp ne i32 %[[B:.*]], 0
// CHECK-OVERFLOW-NOT: icmp ne i32 %{{.*}}, 0
// CHECK-COMMON: %[[AOK:.*]] = icmp ne i32 %[[A:.*]], -2147483648
// CHECK-COMMON-NEXT: %[[BOK:.*]] = icmp ne i32 %[[B]], -1
// CHECK-COMMON-NEXT: %[[OVER:.*]] = or i1 %[[AOK]], %[[BOK]]
// CHECK-COMMON: %[[OK:.*]] = and i1 %[[ZERO]], %[[OVER]]
// CHECK-COMMON: br i1 %[[OK]]
// CHECK-OVERFLOW: %[[AOK:.*]] = icmp ne i32 %[[A:.*]], -2147483648
// CHECK-OVERFLOW-NEXT: %[[BOK:.*]] = icmp ne i32 %[[B:.*]], -1
// CHECK-OVERFLOW-NEXT: %[[OK:.*]] = or i1 %[[AOK]], %[[BOK]]
// CHECK-OVERFLOW: br i1 %[[OK]]
// CHECK-TRAP: call void @llvm.ubsantrap(i8 3) [[NR_NUW]]
// CHECK-TRAP: unreachable
return a / b;
// CHECK-COMMON: }
// CHECK-OVERFLOW: }
}
// CHECK-COMMON-LABEL: @sour_bool
_Bool sour_bool(_Bool *p) {
// CHECK-COMMON: %[[OK:.*]] = icmp ule i8 {{.*}}, 1
// CHECK-COMMON: br i1 %[[OK]]
// CHECK-UBSAN: call void @__ubsan_handle_load_invalid_value(i8* bitcast ({{.*}}), i64 {{.*}})
// CHECK-TRAP: call void @llvm.ubsantrap(i8 10) [[NR_NUW]]
// CHECK-TRAP: unreachable
return *p;
}
// CHECK-COMMON-LABEL: @ret_nonnull
__attribute__((returns_nonnull))
int *ret_nonnull(int *a) {
// CHECK-COMMON: [[OK:%.*]] = icmp ne i32* {{.*}}, null
// CHECK-COMMON: br i1 [[OK]]
// CHECK-UBSAN: call void @__ubsan_handle_nonnull_return
// CHECK-TRAP: call void @llvm.ubsantrap(i8 17) [[NR_NUW]]
// CHECK-TRAP: unreachable
return a;
}
// CHECK-COMMON-LABEL: @call_decl_nonnull
__attribute__((nonnull)) void decl_nonnull(int *a);
void call_decl_nonnull(int *a) {
// CHECK-COMMON: [[OK:%.*]] = icmp ne i32* {{.*}}, null
// CHECK-COMMON: br i1 [[OK]]
// CHECK-UBSAN: call void @__ubsan_handle_nonnull_arg
// CHECK-TRAP: call void @llvm.ubsantrap(i8 16) [[NR_NUW]]
// CHECK-TRAP: unreachable
decl_nonnull(a);
}
extern void *memcpy (void *, const void *, unsigned) __attribute__((nonnull(1, 2)));
// CHECK-COMMON-LABEL: @call_memcpy_nonnull
void call_memcpy_nonnull(void *p, void *q, int sz) {
// CHECK-COMMON: icmp ne i8* {{.*}}, null
// CHECK-UBSAN: call void @__ubsan_handle_nonnull_arg
// CHECK-TRAP: call void @llvm.ubsantrap(i8 16)
// CHECK-COMMON: icmp ne i8* {{.*}}, null
// CHECK-UBSAN: call void @__ubsan_handle_nonnull_arg
// CHECK-TRAP: call void @llvm.ubsantrap(i8 16)
memcpy(p, q, sz);
}
extern void *memmove (void *, const void *, unsigned) __attribute__((nonnull(1, 2)));
// CHECK-COMMON-LABEL: @call_memmove_nonnull
void call_memmove_nonnull(void *p, void *q, int sz) {
// CHECK-COMMON: icmp ne i8* {{.*}}, null
// CHECK-UBSAN: call void @__ubsan_handle_nonnull_arg
// CHECK-TRAP: call void @llvm.ubsantrap(i8 16)
// CHECK-COMMON: icmp ne i8* {{.*}}, null
// CHECK-UBSAN: call void @__ubsan_handle_nonnull_arg
// CHECK-TRAP: call void @llvm.ubsantrap(i8 16)
memmove(p, q, sz);
}
// CHECK-COMMON-LABEL: @call_nonnull_variadic
__attribute__((nonnull)) void nonnull_variadic(int a, ...);
void call_nonnull_variadic(int a, int *b) {
// CHECK-COMMON: [[OK:%.*]] = icmp ne i32* {{.*}}, null
// CHECK-COMMON: br i1 [[OK]]
// CHECK-UBSAN: call void @__ubsan_handle_nonnull_arg
// CHECK-UBSAN-NOT: __ubsan_handle_nonnull_arg
// CHECK-COMMON: call void (i32, ...) @nonnull_variadic
nonnull_variadic(a, b);
}
// CHECK-UBSAN: ![[WEIGHT_MD]] = !{!"branch_weights", i32 1048575, i32 1}
// CHECK-TRAP: attributes [[NR_NUW]] = { noreturn nounwind }
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