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llvm-project/clang/test/CodeGen/object-size.c
George Burgess IV a51c4077c5 Make __builtin_object_size more conservative 
r246877 made __builtin_object_size substantially more aggressive with
unknown bases if Type=1 or Type=3, which causes issues when we encounter
code like this:

struct Foo {
  int a;
  char str[1];
};

const char str[] = "Hello, World!";
struct Foo *f = (struct Foo *)malloc(sizeof(*f) + strlen(str));
strcpy(&f->str, str);

__builtin_object_size(&f->str, 1) would hand back 1, which is
technically correct given the type of Foo, but the type of Foo lies to
us about how many bytes are available in this case.

This patch adds support for this "writing off the end" idiom -- we now
answer conservatively when we're given the address of the very last
member in a struct.

Differential Revision: http://reviews.llvm.org/D12169

llvm-svn: 250488
2015-10-16 01:49:01 +00:00

520 lines
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// RUN: %clang_cc1 -triple x86_64-apple-darwin -emit-llvm %s -o - 2>&1 | FileCheck %s
#define strcpy(dest, src) \
((__builtin_object_size(dest, 0) != -1ULL) \
? __builtin___strcpy_chk (dest, src, __builtin_object_size(dest, 1)) \
: __inline_strcpy_chk(dest, src))
static char *__inline_strcpy_chk (char *dest, const char *src) {
return __builtin___strcpy_chk(dest, src, __builtin_object_size(dest, 1));
}
char gbuf[63];
char *gp;
int gi, gj;
// CHECK-LABEL: define void @test1
void test1() {
// CHECK: = call i8* @__strcpy_chk(i8* getelementptr inbounds ([63 x i8], [63 x i8]* @gbuf, i64 0, i64 4), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0), i64 59)
strcpy(&gbuf[4], "Hi there");
}
// CHECK-LABEL: define void @test2
void test2() {
// CHECK: = call i8* @__strcpy_chk(i8* getelementptr inbounds ([63 x i8], [63 x i8]* @gbuf, i32 0, i32 0), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0), i64 63)
strcpy(gbuf, "Hi there");
}
// CHECK-LABEL: define void @test3
void test3() {
// CHECK: = call i8* @__strcpy_chk(i8* getelementptr inbounds ([63 x i8], [63 x i8]* @gbuf, i64 1, i64 37), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0), i64 0)
strcpy(&gbuf[100], "Hi there");
}
// CHECK-LABEL: define void @test4
void test4() {
// CHECK: = call i8* @__strcpy_chk(i8* getelementptr inbounds ([63 x i8], [63 x i8]* @gbuf, i64 0, i64 -1), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0), i64 0)
strcpy((char*)(void*)&gbuf[-1], "Hi there");
}
// CHECK-LABEL: define void @test5
void test5() {
// CHECK: = load i8*, i8** @gp
// CHECK-NEXT:= call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
strcpy(gp, "Hi there");
}
// CHECK-LABEL: define void @test6
void test6() {
char buf[57];
// CHECK: = call i8* @__strcpy_chk(i8* %{{.*}}, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0), i64 53)
strcpy(&buf[4], "Hi there");
}
// CHECK-LABEL: define void @test7
void test7() {
int i;
// Ensure we only evaluate the side-effect once.
// CHECK: = add
// CHECK-NOT: = add
// CHECK: = call i8* @__strcpy_chk(i8* getelementptr inbounds ([63 x i8], [63 x i8]* @gbuf, i32 0, i32 0), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0), i64 63)
strcpy((++i, gbuf), "Hi there");
}
// CHECK-LABEL: define void @test8
void test8() {
char *buf[50];
// CHECK-NOT: __strcpy_chk
// CHECK: = call i8* @__inline_strcpy_chk(i8* %{{.*}}, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0))
strcpy(buf[++gi], "Hi there");
}
// CHECK-LABEL: define void @test9
void test9() {
// CHECK-NOT: __strcpy_chk
// CHECK: = call i8* @__inline_strcpy_chk(i8* %{{.*}}, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0))
strcpy((char *)((++gi) + gj), "Hi there");
}
// CHECK-LABEL: define void @test10
char **p;
void test10() {
// CHECK-NOT: __strcpy_chk
// CHECK: = call i8* @__inline_strcpy_chk(i8* %{{.*}}, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0))
strcpy(*(++p), "Hi there");
}
// CHECK-LABEL: define void @test11
void test11() {
// CHECK-NOT: __strcpy_chk
// CHECK: = call i8* @__inline_strcpy_chk(i8* getelementptr inbounds ([63 x i8], [63 x i8]* @gbuf, i32 0, i32 0), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0))
strcpy(gp = gbuf, "Hi there");
}
// CHECK-LABEL: define void @test12
void test12() {
// CHECK-NOT: __strcpy_chk
// CHECK: = call i8* @__inline_strcpy_chk(i8* %{{.*}}, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0))
strcpy(++gp, "Hi there");
}
// CHECK-LABEL: define void @test13
void test13() {
// CHECK-NOT: __strcpy_chk
// CHECK: = call i8* @__inline_strcpy_chk(i8* %{{.*}}, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0))
strcpy(gp++, "Hi there");
}
// CHECK-LABEL: define void @test14
void test14() {
// CHECK-NOT: __strcpy_chk
// CHECK: = call i8* @__inline_strcpy_chk(i8* %{{.*}}, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0))
strcpy(--gp, "Hi there");
}
// CHECK-LABEL: define void @test15
void test15() {
// CHECK-NOT: __strcpy_chk
// CHECK: = call i8* @__inline_strcpy_chk(i8* %{{..*}}, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0))
strcpy(gp--, "Hi there");
}
// CHECK-LABEL: define void @test16
void test16() {
// CHECK-NOT: __strcpy_chk
// CHECK: = call i8* @__inline_strcpy_chk(i8* %{{.*}}, i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str, i32 0, i32 0))
strcpy(gp += 1, "Hi there");
}
// CHECK-LABEL: @test17
void test17() {
// CHECK: store i32 -1
gi = __builtin_object_size(gp++, 0);
// CHECK: store i32 -1
gi = __builtin_object_size(gp++, 1);
// CHECK: store i32 0
gi = __builtin_object_size(gp++, 2);
// CHECK: store i32 0
gi = __builtin_object_size(gp++, 3);
}
// CHECK-LABEL: @test18
unsigned test18(int cond) {
int a[4], b[4];
// CHECK: phi i32*
// CHECK: call i64 @llvm.objectsize.i64
return __builtin_object_size(cond ? a : b, 0);
}
// CHECK-LABEL: @test19
void test19() {
struct {
int a, b;
} foo;
// CHECK: store i32 8
gi = __builtin_object_size(&foo.a, 0);
// CHECK: store i32 4
gi = __builtin_object_size(&foo.a, 1);
// CHECK: store i32 8
gi = __builtin_object_size(&foo.a, 2);
// CHECK: store i32 4
gi = __builtin_object_size(&foo.a, 3);
// CHECK: store i32 4
gi = __builtin_object_size(&foo.b, 0);
// CHECK: store i32 4
gi = __builtin_object_size(&foo.b, 1);
// CHECK: store i32 4
gi = __builtin_object_size(&foo.b, 2);
// CHECK: store i32 4
gi = __builtin_object_size(&foo.b, 3);
}
// CHECK-LABEL: @test20
void test20() {
struct { int t[10]; } t[10];
// CHECK: store i32 380
gi = __builtin_object_size(&t[0].t[5], 0);
// CHECK: store i32 20
gi = __builtin_object_size(&t[0].t[5], 1);
// CHECK: store i32 380
gi = __builtin_object_size(&t[0].t[5], 2);
// CHECK: store i32 20
gi = __builtin_object_size(&t[0].t[5], 3);
}
// CHECK-LABEL: @test21
void test21() {
struct { int t; } t;
// CHECK: store i32 0
gi = __builtin_object_size(&t + 1, 0);
// CHECK: store i32 0
gi = __builtin_object_size(&t + 1, 1);
// CHECK: store i32 0
gi = __builtin_object_size(&t + 1, 2);
// CHECK: store i32 0
gi = __builtin_object_size(&t + 1, 3);
// CHECK: store i32 0
gi = __builtin_object_size(&t.t + 1, 0);
// CHECK: store i32 0
gi = __builtin_object_size(&t.t + 1, 1);
// CHECK: store i32 0
gi = __builtin_object_size(&t.t + 1, 2);
// CHECK: store i32 0
gi = __builtin_object_size(&t.t + 1, 3);
}
// CHECK-LABEL: @test22
void test22() {
struct { int t[10]; } t[10];
// CHECK: store i32 0
gi = __builtin_object_size(&t[10], 0);
// CHECK: store i32 0
gi = __builtin_object_size(&t[10], 1);
// CHECK: store i32 0
gi = __builtin_object_size(&t[10], 2);
// CHECK: store i32 0
gi = __builtin_object_size(&t[10], 3);
// CHECK: store i32 0
gi = __builtin_object_size(&t[9].t[10], 0);
// CHECK: store i32 0
gi = __builtin_object_size(&t[9].t[10], 1);
// CHECK: store i32 0
gi = __builtin_object_size(&t[9].t[10], 2);
// CHECK: store i32 0
gi = __builtin_object_size(&t[9].t[10], 3);
// CHECK: store i32 0
gi = __builtin_object_size((char*)&t[0] + sizeof(t), 0);
// CHECK: store i32 0
gi = __builtin_object_size((char*)&t[0] + sizeof(t), 1);
// CHECK: store i32 0
gi = __builtin_object_size((char*)&t[0] + sizeof(t), 2);
// CHECK: store i32 0
gi = __builtin_object_size((char*)&t[0] + sizeof(t), 3);
// CHECK: store i32 0
gi = __builtin_object_size((char*)&t[9].t[0] + 10*sizeof(t[0].t), 0);
// CHECK: store i32 0
gi = __builtin_object_size((char*)&t[9].t[0] + 10*sizeof(t[0].t), 1);
// CHECK: store i32 0
gi = __builtin_object_size((char*)&t[9].t[0] + 10*sizeof(t[0].t), 2);
// CHECK: store i32 0
gi = __builtin_object_size((char*)&t[9].t[0] + 10*sizeof(t[0].t), 3);
}
struct Test23Ty { int a; int t[10]; };
// CHECK-LABEL: @test23
void test23(struct Test23Ty *p) {
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(p, 0);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(p, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 true)
gi = __builtin_object_size(p, 2);
// Note: this is currently fixed at 0 because LLVM doesn't have sufficient
// data to correctly handle type=3
// CHECK: store i32 0
gi = __builtin_object_size(p, 3);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(&p->a, 0);
// CHECK: store i32 4
gi = __builtin_object_size(&p->a, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 true)
gi = __builtin_object_size(&p->a, 2);
// CHECK: store i32 4
gi = __builtin_object_size(&p->a, 3);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(&p->t[5], 0);
// CHECK: store i32 20
gi = __builtin_object_size(&p->t[5], 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 true)
gi = __builtin_object_size(&p->t[5], 2);
// CHECK: store i32 20
gi = __builtin_object_size(&p->t[5], 3);
}
// PR24493 -- ICE if __builtin_object_size called with NULL and (Type & 1) != 0
// CHECK-LABEL: @test24
void test24() {
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 false)
gi = __builtin_object_size((void*)0, 0);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 false)
gi = __builtin_object_size((void*)0, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 true)
gi = __builtin_object_size((void*)0, 2);
// Note: Currently fixed at zero because LLVM can't handle type=3 correctly.
// Hopefully will be lowered properly in the future.
// CHECK: store i32 0
gi = __builtin_object_size((void*)0, 3);
}
// CHECK-LABEL: @test25
void test25() {
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 false)
gi = __builtin_object_size((void*)0x1000, 0);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 false)
gi = __builtin_object_size((void*)0x1000, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 true)
gi = __builtin_object_size((void*)0x1000, 2);
// Note: Currently fixed at zero because LLVM can't handle type=3 correctly.
// Hopefully will be lowered properly in the future.
// CHECK: store i32 0
gi = __builtin_object_size((void*)0x1000, 3);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 false)
gi = __builtin_object_size((void*)0 + 0x1000, 0);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 false)
gi = __builtin_object_size((void*)0 + 0x1000, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 true)
gi = __builtin_object_size((void*)0 + 0x1000, 2);
// Note: Currently fixed at zero because LLVM can't handle type=3 correctly.
// Hopefully will be lowered properly in the future.
// CHECK: store i32 0
gi = __builtin_object_size((void*)0 + 0x1000, 3);
}
// CHECK-LABEL: @test26
void test26() {
struct { int v[10]; } t[10];
// CHECK: store i32 316
gi = __builtin_object_size(&t[1].v[11], 0);
// CHECK: store i32 312
gi = __builtin_object_size(&t[1].v[12], 1);
// CHECK: store i32 308
gi = __builtin_object_size(&t[1].v[13], 2);
// CHECK: store i32 0
gi = __builtin_object_size(&t[1].v[14], 3);
}
struct Test27IncompleteTy;
// CHECK-LABEL: @test27
void test27(struct Test27IncompleteTy *t) {
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(t, 0);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(t, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 true)
gi = __builtin_object_size(t, 2);
// Note: this is currently fixed at 0 because LLVM doesn't have sufficient
// data to correctly handle type=3
// CHECK: store i32 0
gi = __builtin_object_size(t, 3);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 false)
gi = __builtin_object_size(&test27, 0);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 false)
gi = __builtin_object_size(&test27, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* {{.*}}, i1 true)
gi = __builtin_object_size(&test27, 2);
// Note: this is currently fixed at 0 because LLVM doesn't have sufficient
// data to correctly handle type=3
// CHECK: store i32 0
gi = __builtin_object_size(&test27, 3);
}
// The intent of this test is to ensure that __builtin_object_size treats `&foo`
// and `(T*)&foo` identically, when used as the pointer argument.
// CHECK-LABEL: @test28
void test28() {
struct { int v[10]; } t[10];
#define addCasts(s) ((char*)((short*)(s)))
// CHECK: store i32 360
gi = __builtin_object_size(addCasts(&t[1]), 0);
// CHECK: store i32 360
gi = __builtin_object_size(addCasts(&t[1]), 1);
// CHECK: store i32 360
gi = __builtin_object_size(addCasts(&t[1]), 2);
// CHECK: store i32 360
gi = __builtin_object_size(addCasts(&t[1]), 3);
// CHECK: store i32 356
gi = __builtin_object_size(addCasts(&t[1].v[1]), 0);
// CHECK: store i32 36
gi = __builtin_object_size(addCasts(&t[1].v[1]), 1);
// CHECK: store i32 356
gi = __builtin_object_size(addCasts(&t[1].v[1]), 2);
// CHECK: store i32 36
gi = __builtin_object_size(addCasts(&t[1].v[1]), 3);
#undef addCasts
}
struct DynStructVar {
char fst[16];
char snd[];
};
struct DynStruct0 {
char fst[16];
char snd[0];
};
struct DynStruct1 {
char fst[16];
char snd[1];
};
struct StaticStruct {
char fst[16];
char snd[2];
};
// CHECK-LABEL: @test29
void test29(struct DynStructVar *dv, struct DynStruct0 *d0,
struct DynStruct1 *d1, struct StaticStruct *ss) {
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(dv->snd, 0);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(dv->snd, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 true)
gi = __builtin_object_size(dv->snd, 2);
// CHECK: store i32 0
gi = __builtin_object_size(dv->snd, 3);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(d0->snd, 0);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(d0->snd, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 true)
gi = __builtin_object_size(d0->snd, 2);
// CHECK: store i32 0
gi = __builtin_object_size(d0->snd, 3);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(d1->snd, 0);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(d1->snd, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 true)
gi = __builtin_object_size(d1->snd, 2);
// CHECK: store i32 1
gi = __builtin_object_size(d1->snd, 3);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(ss->snd, 0);
// CHECK: store i32 2
gi = __builtin_object_size(ss->snd, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 true)
gi = __builtin_object_size(ss->snd, 2);
// CHECK: store i32 2
gi = __builtin_object_size(ss->snd, 3);
}
// CHECK-LABEL: @test30
void test30() {
struct { struct DynStruct1 fst, snd; } *nested;
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(nested->fst.snd, 0);
// CHECK: store i32 1
gi = __builtin_object_size(nested->fst.snd, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 true)
gi = __builtin_object_size(nested->fst.snd, 2);
// CHECK: store i32 1
gi = __builtin_object_size(nested->fst.snd, 3);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(nested->snd.snd, 0);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(nested->snd.snd, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 true)
gi = __builtin_object_size(nested->snd.snd, 2);
// CHECK: store i32 1
gi = __builtin_object_size(nested->snd.snd, 3);
union { struct DynStruct1 d1; char c[1]; } *u;
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(u->c, 0);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(u->c, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 true)
gi = __builtin_object_size(u->c, 2);
// CHECK: store i32 1
gi = __builtin_object_size(u->c, 3);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(u->d1.snd, 0);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(u->d1.snd, 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 true)
gi = __builtin_object_size(u->d1.snd, 2);
// CHECK: store i32 1
gi = __builtin_object_size(u->d1.snd, 3);
}
// CHECK-LABEL: @test31
void test31() {
// Miscellaneous 'writing off the end' detection tests
struct DynStructVar *dsv;
struct DynStruct0 *ds0;
struct DynStruct1 *ds1;
struct StaticStruct *ss;
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(ds1[9].snd, 1);
// CHECH: store i32 2
gi = __builtin_object_size(&ss[9].snd[0], 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(&ds1[9].snd[0], 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(&ds0[9].snd[0], 1);
// CHECK: call i64 @llvm.objectsize.i64.p0i8(i8* %{{.*}}, i1 false)
gi = __builtin_object_size(&dsv[9].snd[0], 1);
}
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