shylie/llvm-project
1
0
Fork 0
Code Issues Pull Requests Actions 6 Packages Projects Releases Wiki Activity
llvm-project/clang/test/CodeGen/catch-undef-behavior.c
David Tweed 042e0883cb Scalar shifts in the OpenCL specification (as of v. 1.2) are defined to be 
with respect to the lower "left-hand-side bitwidth" bits, even when negative);
see OpenCL spec 6.3j. This patch both implements this behaviour in the code
generator and "constant folding" bits of Sema, and also prevents tests
to detect undefinedness in terms of the weaker C99 or C++ specifications
from being applied. 

llvm-svn: 171755
2013-01-07 16:43:27 +00:00

259 lines
9.4 KiB
C
Raw Blame History

// RUN: %clang_cc1 -fsanitize=alignment,null,object-size,shift,return,signed-integer-overflow,vla-bound,float-cast-overflow,integer-divide-by-zero,bool -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s
// RUN: %clang_cc1 -fsanitize=null -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s --check-prefix=CHECK-NULL
// RUN: %clang_cc1 -fsanitize=signed-integer-overflow -emit-llvm %s -o - -triple x86_64-linux-gnu | FileCheck %s --check-prefix=CHECK-OVERFLOW
// CHECK: @[[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: @[[LINE_100:.*]] = private unnamed_addr constant {{.*}}, i32 100, i32 5 {{.*}} @[[INT]], i64 4, i8 1
// CHECK: @[[LINE_200:.*]] = {{.*}}, i32 200, i32 10 {{.*}}, i64 4, i8 0
// CHECK: @[[LINE_300_A:.*]] = {{.*}}, i32 300, i32 12 {{.*}} @{{.*}}, {{.*}} @{{.*}}
// CHECK: @[[LINE_300_B:.*]] = {{.*}}, i32 300, i32 12 {{.*}} @{{.*}}, {{.*}} @{{.*}}
// CHECK: @[[LINE_400:.*]] = {{.*}}, i32 400, i32 12 {{.*}} @{{.*}}, {{.*}} @{{.*}}
// CHECK: @[[LINE_500:.*]] = {{.*}}, i32 500, i32 10 {{.*}} @{{.*}}, i64 4, i8 0 }
// CHECK: @[[LINE_600:.*]] = {{.*}}, i32 600, i32 3 {{.*}} @{{.*}}, i64 4, i8 1 }
// CHECK: @[[STRUCT_S:.*]] = private unnamed_addr constant { i16, i16, [11 x i8] } { i16 -1, i16 0, [11 x i8] c"'struct S'\00" }
// CHECK: @[[LINE_700:.*]] = {{.*}}, i32 700, i32 14 {{.*}} @[[STRUCT_S]], i64 4, i8 3 }
// CHECK: @[[LINE_800:.*]] = {{.*}}, i32 800, i32 12 {{.*}} @{{.*}} }
// CHECK: @[[LINE_900:.*]] = {{.*}}, i32 900, i32 11 {{.*}} @{{.*}} }
// CHECK-NULL: @[[LINE_100:.*]] = private unnamed_addr constant {{.*}}, i32 100, i32 5 {{.*}}
// PR6805
// CHECK: @foo
// CHECK-NULL: @foo
void foo() {
union { int i; } u;
// CHECK: %[[CHECK0:.*]] = icmp ne {{.*}}* %[[PTR:.*]], null
// CHECK: %[[I8PTR:.*]] = bitcast i32* %[[PTR]] to i8*
// CHECK-NEXT: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64(i8* %[[I8PTR]], i1 false)
// CHECK-NEXT: %[[CHECK1:.*]] = icmp uge i64 %[[SIZE]], 4
// CHECK-NEXT: %[[CHECK01:.*]] = and i1 %[[CHECK0]], %[[CHECK1]]
// CHECK: %[[PTRTOINT:.*]] = ptrtoint {{.*}}* %[[PTR]] to i64
// CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRTOINT]], 3
// CHECK-NEXT: %[[CHECK2:.*]] = icmp eq i64 %[[MISALIGN]], 0
// CHECK: %[[OK:.*]] = and i1 %[[CHECK01]], %[[CHECK2]]
// CHECK-NEXT: br i1 %[[OK]], {{.*}} !prof ![[WEIGHT_MD:.*]]
// CHECK: %[[ARG:.*]] = ptrtoint {{.*}} %[[PTR]] to i64
// CHECK-NEXT: call void @__ubsan_handle_type_mismatch(i8* bitcast ({{.*}} @[[LINE_100]] to i8*), i64 %[[ARG]])
// With -fsanitize=null, only perform the null check.
// CHECK-NULL: %[[NULL:.*]] = icmp ne {{.*}}, null
// CHECK-NULL: br i1 %[[NULL]]
// CHECK-NULL: call void @__ubsan_handle_type_mismatch(i8* bitcast ({{.*}} @[[LINE_100]] to i8*), i64 %{{.*}})
#line 100
u.i=1;
}
// CHECK: @bar
int bar(int *a) {
// CHECK: %[[SIZE:.*]] = call i64 @llvm.objectsize.i64
// CHECK-NEXT: icmp uge i64 %[[SIZE]], 4
// CHECK: %[[PTRINT:.*]] = ptrtoint
// CHECK-NEXT: %[[MISALIGN:.*]] = and i64 %[[PTRINT]], 3
// CHECK-NEXT: icmp eq i64 %[[MISALIGN]], 0
// CHECK: %[[ARG:.*]] = ptrtoint
// CHECK-NEXT: call void @__ubsan_handle_type_mismatch(i8* bitcast ({{.*}} @[[LINE_200]] to i8*), i64 %[[ARG]])
#line 200
return *a;
}
// CHECK: @addr_space
int addr_space(int __attribute__((address_space(256))) *a) {
// CHECK-NOT: __ubsan
return *a;
}
// CHECK: @lsh_overflow
int lsh_overflow(int a, int b) {
// CHECK: %[[INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31
// CHECK-NEXT: br i1 %[[INBOUNDS]]
// FIXME: Only emit one trap block here.
// CHECK: %[[ARG1:.*]] = zext
// CHECK-NEXT: %[[ARG2:.*]] = zext
// CHECK-NEXT: call void @__ubsan_handle_shift_out_of_bounds(i8* bitcast ({{.*}} @[[LINE_300_A]] to i8*), i64 %[[ARG1]], i64 %[[ARG2]])
// CHECK: %[[SHIFTED_OUT_WIDTH:.*]] = sub nuw nsw i32 31, %[[RHS]]
// CHECK-NEXT: %[[SHIFTED_OUT:.*]] = lshr i32 %[[LHS:.*]], %[[SHIFTED_OUT_WIDTH]]
// CHECK-NEXT: %[[NO_OVERFLOW:.*]] = icmp eq i32 %[[SHIFTED_OUT]], 0
// CHECK-NEXT: br i1 %[[NO_OVERFLOW]], {{.*}} !prof ![[WEIGHT_MD]]
// CHECK: %[[ARG1:.*]] = zext
// CHECK-NEXT: %[[ARG2:.*]] = zext
// CHECK-NEXT: call void @__ubsan_handle_shift_out_of_bounds(i8* bitcast ({{.*}} @[[LINE_300_B]] to i8*), i64 %[[ARG1]], i64 %[[ARG2]])
// CHECK: %[[RET:.*]] = shl i32 %[[LHS]], %[[RHS]]
// CHECK-NEXT: ret i32 %[[RET]]
#line 300
return a << b;
}
// CHECK: @rsh_inbounds
int rsh_inbounds(int a, int b) {
// CHECK: %[[INBOUNDS:.*]] = icmp ule i32 %[[RHS:.*]], 31
// CHECK: br i1 %[[INBOUNDS]]
// CHECK: %[[ARG1:.*]] = zext
// CHECK-NEXT: %[[ARG2:.*]] = zext
// CHECK-NEXT: call void @__ubsan_handle_shift_out_of_bounds(i8* bitcast ({{.*}} @[[LINE_400]] to i8*), i64 %[[ARG1]], i64 %[[ARG2]])
// CHECK: %[[RET:.*]] = ashr i32 %[[LHS]], %[[RHS]]
// CHECK-NEXT: ret i32 %[[RET]]
#line 400
return a >> b;
}
// CHECK: @load
int load(int *p) {
// CHECK: call void @__ubsan_handle_type_mismatch(i8* bitcast ({{.*}} @[[LINE_500]] to i8*), i64 %{{.*}})
#line 500
return *p;
}
// CHECK: @store
void store(int *p, int q) {
// CHECK: call void @__ubsan_handle_type_mismatch(i8* bitcast ({{.*}} @[[LINE_600]] to i8*), i64 %{{.*}})
#line 600
*p = q;
}
struct S { int k; };
// CHECK: @member_access
int *member_access(struct S *p) {
// CHECK: call void @__ubsan_handle_type_mismatch(i8* bitcast ({{.*}} @[[LINE_700]] to i8*), i64 %{{.*}})
#line 700
return &p->k;
}
// CHECK: @signed_overflow
int signed_overflow(int a, int b) {
// CHECK: %[[ARG1:.*]] = zext
// CHECK-NEXT: %[[ARG2:.*]] = zext
// CHECK-NEXT: call void @__ubsan_handle_add_overflow(i8* bitcast ({{.*}} @[[LINE_800]] to i8*), i64 %[[ARG1]], i64 %[[ARG2]])
#line 800
return a + b;
}
// CHECK: @no_return
int no_return() {
// 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-NOT: call
// CHECK-NOT: unreachable
// CHECK: ret i32
}
// CHECK: @vla_bound
void vla_bound(int n) {
// CHECK: icmp sgt i32 %[[PARAM:.*]], 0
//
// CHECK: %[[ARG:.*]] = zext i32 %[[PARAM]] to i64
// CHECK-NEXT: call void @__ubsan_handle_vla_bound_not_positive(i8* bitcast ({{.*}} @[[LINE_900]] to i8*), i64 %[[ARG]])
#line 900
int arr[n * 3];
}
// CHECK: @int_float_no_overflow
float int_float_no_overflow(__int128 n) {
// CHECK-NOT: call void @__ubsan_handle
return n;
}
// CHECK: @int_float_overflow
float int_float_overflow(unsigned __int128 n) {
// This is 2**104. FLT_MAX is 2**128 - 2**104.
// CHECK: icmp ule i128 %{{.*}}, -20282409603651670423947251286016
// CHECK: call void @__ubsan_handle_float_cast_overflow(
return n;
}
// CHECK: @int_fp16_overflow
void int_fp16_overflow(int n, __fp16 *p) {
// CHECK: %[[GE:.*]] = icmp sge i32 %{{.*}}, -65504
// CHECK: %[[LE:.*]] = icmp sle i32 %{{.*}}, 65504
// CHECK: and i1 %[[GE]], %[[LE]]
// CHECK: call void @__ubsan_handle_float_cast_overflow(
*p = n;
}
// CHECK: @float_int_overflow
int float_int_overflow(float f) {
// CHECK: %[[GE:.*]] = fcmp oge float %[[F:.*]], 0xC1E0000000000000
// CHECK: %[[LE:.*]] = fcmp ole float %[[F]], 0x41DFFFFFE0000000
// CHECK: and i1 %[[GE]], %[[LE]]
// CHECK: call void @__ubsan_handle_float_cast_overflow(
return f;
}
// CHECK: @float_uint_overflow
unsigned float_uint_overflow(float f) {
// CHECK: %[[GE:.*]] = fcmp oge float %[[F:.*]], 0.{{0*}}e+00
// CHECK: %[[LE:.*]] = fcmp ole float %[[F]], 0x41EFFFFFE0000000
// CHECK: and i1 %[[GE]], %[[LE]]
// CHECK: call void @__ubsan_handle_float_cast_overflow(
return f;
}
// CHECK: @fp16_char_overflow
signed char fp16_char_overflow(__fp16 *p) {
// CHECK: %[[GE:.*]] = fcmp oge float %[[F:.*]], -1.28{{0*}}e+02
// CHECK: %[[LE:.*]] = fcmp ole float %[[F]], 1.27{{0*}}e+02
// CHECK: and i1 %[[GE]], %[[LE]]
// CHECK: call void @__ubsan_handle_float_cast_overflow(
return *p;
}
// CHECK: @float_float_overflow
float float_float_overflow(double f) {
// CHECK: %[[GE:.*]] = fcmp oge double %[[F:.*]], 0xC7EFFFFFE0000000
// CHECK: %[[LE:.*]] = fcmp ole double %[[F]], 0x47EFFFFFE0000000
// CHECK: and i1 %[[GE]], %[[LE]]
// CHECK: call void @__ubsan_handle_float_cast_overflow(
return f;
}
// CHECK: @int_divide_overflow
// CHECK-OVERFLOW: @int_divide_overflow
int int_divide_overflow(int a, int b) {
// CHECK: %[[ZERO:.*]] = icmp ne i32 %[[B:.*]], 0
// CHECK-OVERFLOW-NOT: icmp ne i32 %{{.*}}, 0
// CHECK: %[[AOK:.*]] = icmp ne i32 %[[A:.*]], -2147483648
// CHECK-NEXT: %[[BOK:.*]] = icmp ne i32 %[[B]], -1
// CHECK-NEXT: %[[OVER:.*]] = or i1 %[[AOK]], %[[BOK]]
// 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: %[[OK:.*]] = and i1 %[[ZERO]], %[[OVER]]
// CHECK: br i1 %[[OK]]
// CHECK-OVERFLOW: br i1 %[[OK]]
return a / b;
// CHECK: }
// CHECK-OVERFLOW: }
}
// CHECK: @sour_bool
_Bool sour_bool(_Bool *p) {
// CHECK: %[[OK:.*]] = icmp ule i8 {{.*}}, 1
// CHECK: br i1 %[[OK]]
// CHECK: call void @__ubsan_handle_load_invalid_value(i8* bitcast ({{.*}}), i64 {{.*}})
return *p;
}
// CHECK: ![[WEIGHT_MD]] = metadata !{metadata !"branch_weights", i32 1048575, i32 1}
Reference in New Issue View Git Blame Copy Permalink