clang/test/CodeGen/object-size.cpp

   1 // RUN: %clang_cc1 -triple x86_64-apple-darwin -emit-llvm -o - %s | FileCheck %s
   2
   3 // C++-specific tests for __builtin_object_size
   4
   5 int gi;
   6
   7 // CHECK-LABEL: define{{.*}} void @_Z5test1v()
   8 void test1() {
   9   // Guaranteeing that our cast removal logic doesn't break more interesting
  10   // cases.
  11   struct A { int a; };
  12   struct B { int b; };
  13   struct C: public A, public B {};
  14
  15   C c;
  16
  17   // CHECK: store i32 8
  18   gi = __builtin_object_size(&c, 0);
  19   // CHECK: store i32 8
  20   gi = __builtin_object_size((A*)&c, 0);
  21   // CHECK: store i32 4
  22   gi = __builtin_object_size((B*)&c, 0);
  23
  24   // CHECK: store i32 8
  25   gi = __builtin_object_size((char*)&c, 0);
  26   // CHECK: store i32 8
  27   gi = __builtin_object_size((char*)(A*)&c, 0);
  28   // CHECK: store i32 4
  29   gi = __builtin_object_size((char*)(B*)&c, 0);
  30 }
  31
  32 // CHECK-LABEL: define{{.*}} void @_Z5test2v()
  33 void test2() {
  34   struct A { char buf[16]; };
  35   struct B : A {};
  36   struct C { int i; B bs[1]; } *c;
  37
  38   // CHECK: call i64 @llvm.objectsize.i64.p0(ptr %{{.*}}, i1 false, i1 true, i1 false)
  39   gi = __builtin_object_size(&c->bs[0], 0);
  40   // CHECK: call i64 @llvm.objectsize.i64.p0(ptr %{{.*}}, i1 false, i1 true, i1 false)
  41   gi = __builtin_object_size(&c->bs[0], 1);
  42   // CHECK: call i64 @llvm.objectsize.i64.p0(ptr %{{.*}}, i1 true, i1 true, i1 false)
  43   gi = __builtin_object_size(&c->bs[0], 2);
  44   // CHECK: store i32 16
  45   gi = __builtin_object_size(&c->bs[0], 3);
  46
  47   // CHECK: call i64 @llvm.objectsize.i64.p0(ptr %{{.*}}, i1 false, i1 true, i1 false)
  48   gi = __builtin_object_size((A*)&c->bs[0], 0);
  49   // CHECK: store i32 16
  50   gi = __builtin_object_size((A*)&c->bs[0], 1);
  51   // CHECK: call i64 @llvm.objectsize.i64.p0(ptr %{{.*}}, i1 true, i1 true, i1 false)
  52   gi = __builtin_object_size((A*)&c->bs[0], 2);
  53   // CHECK: store i32 16
  54   gi = __builtin_object_size((A*)&c->bs[0], 3);
  55
  56   // CHECK: call i64 @llvm.objectsize.i64.p0(ptr %{{.*}}, i1 false, i1 true, i1 false)
  57   gi = __builtin_object_size(&c->bs[0].buf[0], 0);
  58   // CHECK: store i32 16
  59   gi = __builtin_object_size(&c->bs[0].buf[0], 1);
  60   // CHECK: call i64 @llvm.objectsize.i64.p0(ptr %{{.*}}, i1 true, i1 true, i1 false)
  61   gi = __builtin_object_size(&c->bs[0].buf[0], 2);
  62   // CHECK: store i32 16
  63   gi = __builtin_object_size(&c->bs[0].buf[0], 3);
  64 }