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llvm-project/clang/test/CodeGenCXX/new.cpp

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// RUN: %clang_cc1 -std=c++14 -triple x86_64-unknown-unknown %s -emit-llvm -o - | FileCheck %s
typedef __typeof__(sizeof(0)) size_t;
// Declare an 'operator new' template to tickle a bug in __builtin_operator_new.
template<typename T> void *operator new(size_t, int (*)(T));
// Ensure that this declaration doesn't cause operator new to lose its
// 'noalias' attribute.
void *operator new[](size_t);
void t1() {
delete new int;
delete [] new int [3];
}
// CHECK: declare nonnull i8* @_Znwm(i64) [[ATTR_NOBUILTIN:#[^ ]*]]
// CHECK: declare void @_ZdlPv(i8*) [[ATTR_NOBUILTIN_NOUNWIND:#[^ ]*]]
// CHECK: declare nonnull i8* @_Znam(i64) [[ATTR_NOBUILTIN]]
// CHECK: declare void @_ZdaPv(i8*) [[ATTR_NOBUILTIN_NOUNWIND]]
namespace std {
struct nothrow_t {};
}
std::nothrow_t nothrow;
// Declare the reserved placement operators.
void *operator new(size_t, void*) throw();
void operator delete(void*, void*) throw();
void *operator new[](size_t, void*) throw();
void operator delete[](void*, void*) throw();
// Declare the replaceable global allocation operators.
void *operator new(size_t, const std::nothrow_t &) throw();
void *operator new[](size_t, const std::nothrow_t &) throw();
void operator delete(void *, const std::nothrow_t &) throw();
void operator delete[](void *, const std::nothrow_t &) throw();
// Declare some other placemenet operators.
void *operator new(size_t, void*, bool) throw();
void *operator new[](size_t, void*, bool) throw();
void t2(int* a) {
int* b = new (a) int;
}
struct S {
int a;
};
// POD types.
void t3() {
int *a = new int(10);
_Complex int* b = new _Complex int(10i);
S s;
s.a = 10;
S *sp = new S(s);
}
// Non-POD
struct T {
T();
int a;
};
void t4() {
// CHECK: call void @_ZN1TC1Ev
T *t = new T;
}
struct T2 {
int a;
T2(int, int);
};
void t5() {
// CHECK: call void @_ZN2T2C1Eii
T2 *t2 = new T2(10, 10);
}
int *t6() {
// Null check.
return new (0) int(10);
}
void t7() {
new int();
}
struct U {
~U();
};
void t8(int n) {
new int[10];
new int[n];
// Non-POD
new T[10];
new T[n];
// Cookie required
new U[10];
new U[n];
}
void t9() {
bool b;
new bool(true);
new (&b) bool(true);
}
struct A {
void* operator new(__typeof(sizeof(int)), int, float, ...);
A();
};
A* t10() {
// CHECK: @_ZN1AnwEmifz
return new(1, 2, 3.45, 100) A;
}
// CHECK-LABEL: define void @_Z3t11i
struct B { int a; };
struct Bmemptr { int Bmemptr::* memptr; int a; };
void t11(int n) {
// CHECK: call noalias nonnull i8* @_Znwm
// CHECK: call void @llvm.memset.p0i8.i64(
B* b = new B();
// CHECK: call noalias nonnull i8* @_Znam
// CHECK: {{call void.*llvm.memset.p0i8.i64.*i8 0, i64 %}}
B *b2 = new B[n]();
// CHECK: call noalias nonnull i8* @_Znam
// CHECK: call void @llvm.memcpy.p0i8.p0i8.i64
// CHECK: br
Bmemptr *b_memptr = new Bmemptr[n]();
// CHECK: ret void
}
struct Empty { };
// We don't need to initialize an empty class.
// CHECK-LABEL: define void @_Z3t12v
void t12() {
// CHECK: call noalias nonnull i8* @_Znam
// CHECK-NOT: br
(void)new Empty[10];
// CHECK: call noalias nonnull i8* @_Znam
// CHECK-NOT: br
(void)new Empty[10]();
// CHECK: ret void
}
// Zero-initialization
// CHECK-LABEL: define void @_Z3t13i
void t13(int n) {
// CHECK: call noalias nonnull i8* @_Znwm
// CHECK: store i32 0, i32*
(void)new int();
// CHECK: call noalias nonnull i8* @_Znam
// CHECK: {{call void.*llvm.memset.p0i8.i64.*i8 0, i64 %}}
(void)new int[n]();
// CHECK-NEXT: ret void
}
struct Alloc{
int x;
void* operator new[](size_t size);
void operator delete[](void* p);
~Alloc();
};
void f() {
// CHECK: call i8* @_ZN5AllocnaEm(i64 808)
// CHECK: store i64 200
// CHECK: call void @_ZN5AllocD1Ev(
// CHECK: call void @_ZN5AllocdaEPv(i8*
delete[] new Alloc[10][20];
// CHECK: call noalias nonnull i8* @_Znwm
// CHECK: call void @_ZdlPv(i8*
delete new bool;
// CHECK: ret void
}
namespace test15 {
struct A { A(); ~A(); };
// CHECK-LABEL: define void @_ZN6test156test0aEPv(
// CHECK: [[P:%.*]] = load i8*, i8**
// CHECK-NOT: icmp eq i8* [[P]], null
// CHECK-NOT: br i1
// CHECK: [[T0:%.*]] = bitcast i8* [[P]] to [[A:%.*]]*
// CHECK-NEXT: call void @_ZN6test151AC1Ev([[A]]* [[T0]])
void test0a(void *p) {
new (p) A();
}
// CHECK-LABEL: define void @_ZN6test156test0bEPv(
// CHECK: [[P0:%.*]] = load i8*, i8**
// CHECK: [[P:%.*]] = call i8* @_ZnwmPvb(i64 1, i8* [[P0]]
// CHECK-NEXT: icmp eq i8* [[P]], null
// CHECK-NEXT: br i1
// CHECK: [[T0:%.*]] = bitcast i8* [[P]] to [[A:%.*]]*
// CHECK-NEXT: call void @_ZN6test151AC1Ev([[A]]* [[T0]])
void test0b(void *p) {
new (p, true) A();
}
// CHECK-LABEL: define void @_ZN6test156test1aEPv(
// CHECK: [[P:%.*]] = load i8*, i8**
// CHECK-NOT: icmp eq i8* [[P]], null
// CHECK-NOT: br i1
// CHECK: [[BEGIN:%.*]] = bitcast i8* [[P]] to [[A:%.*]]*
// CHECK-NEXT: [[END:%.*]] = getelementptr inbounds [[A]], [[A]]* [[BEGIN]], i64 5
// CHECK-NEXT: br label
// CHECK: [[CUR:%.*]] = phi [[A]]* [ [[BEGIN]], {{%.*}} ], [ [[NEXT:%.*]], {{%.*}} ]
// CHECK-NEXT: call void @_ZN6test151AC1Ev([[A]]* [[CUR]])
// CHECK-NEXT: [[NEXT]] = getelementptr inbounds [[A]], [[A]]* [[CUR]], i64 1
// CHECK-NEXT: [[DONE:%.*]] = icmp eq [[A]]* [[NEXT]], [[END]]
// CHECK-NEXT: br i1 [[DONE]]
void test1a(void *p) {
new (p) A[5];
}
// CHECK-LABEL: define void @_ZN6test156test1bEPv(
// CHECK: [[P0:%.*]] = load i8*, i8**
// CHECK: [[P:%.*]] = call i8* @_ZnamPvb(i64 13, i8* [[P0]]
// CHECK-NEXT: icmp eq i8* [[P]], null
// CHECK-NEXT: br i1
// CHECK: [[AFTER_COOKIE:%.*]] = getelementptr inbounds i8, i8* [[P]], i64 8
// CHECK: [[BEGIN:%.*]] = bitcast i8* [[AFTER_COOKIE]] to [[A:%.*]]*
// CHECK-NEXT: [[END:%.*]] = getelementptr inbounds [[A]], [[A]]* [[BEGIN]], i64 5
// CHECK-NEXT: br label
// CHECK: [[CUR:%.*]] = phi [[A]]* [ [[BEGIN]], {{%.*}} ], [ [[NEXT:%.*]], {{%.*}} ]
// CHECK-NEXT: call void @_ZN6test151AC1Ev([[A]]* [[CUR]])
// CHECK-NEXT: [[NEXT]] = getelementptr inbounds [[A]], [[A]]* [[CUR]], i64 1
// CHECK-NEXT: [[DONE:%.*]] = icmp eq [[A]]* [[NEXT]], [[END]]
// CHECK-NEXT: br i1 [[DONE]]
void test1b(void *p) {
new (p, true) A[5];
}
// TODO: it's okay if all these size calculations get dropped.
// FIXME: maybe we should try to throw on overflow?
// CHECK-LABEL: define void @_ZN6test155test2EPvi(
// CHECK: [[N:%.*]] = load i32, i32*
// CHECK-NEXT: [[T0:%.*]] = sext i32 [[N]] to i64
// CHECK-NEXT: [[P:%.*]] = load i8*, i8**
// CHECK: [[BEGIN:%.*]] = bitcast i8* [[P]] to [[A:%.*]]*
// CHECK-NEXT: [[ISEMPTY:%.*]] = icmp eq i64 [[T0]], 0
// CHECK-NEXT: br i1 [[ISEMPTY]],
// CHECK: [[END:%.*]] = getelementptr inbounds [[A]], [[A]]* [[BEGIN]], i64 [[T0]]
// CHECK-NEXT: br label
// CHECK: [[CUR:%.*]] = phi [[A]]* [ [[BEGIN]],
// CHECK-NEXT: call void @_ZN6test151AC1Ev([[A]]* [[CUR]])
void test2(void *p, int n) {
new (p) A[n];
}
}
namespace PR10197 {
// CHECK-LABEL: define weak_odr void @_ZN7PR101971fIiEEvv()
template<typename T>
void f() {
// CHECK: [[CALL:%.*]] = call noalias nonnull i8* @_Znwm
// CHECK-NEXT: [[CASTED:%.*]] = bitcast i8* [[CALL]] to
new T;
// CHECK-NEXT: ret void
}
template void f<int>();
}
namespace PR11523 {
class MyClass;
typedef int MyClass::* NewTy;
// CHECK-LABEL: define i64* @_ZN7PR115231fEv
// CHECK: store i64 -1
NewTy* f() { return new NewTy[2](); }
}
namespace PR11757 {
// Make sure we elide the copy construction.
struct X { X(); X(const X&); };
X* a(X* x) { return new X(X()); }
// CHECK: define {{.*}} @_ZN7PR117571aEPNS_1XE
// CHECK: [[CALL:%.*]] = call noalias nonnull i8* @_Znwm
// CHECK-NEXT: [[CASTED:%.*]] = bitcast i8* [[CALL]] to
// CHECK-NEXT: call void @_ZN7PR117571XC1Ev({{.*}}* [[CASTED]])
// CHECK-NEXT: ret {{.*}} [[CASTED]]
}
namespace PR13380 {
struct A { A() {} };
struct B : public A { int x; };
// CHECK-LABEL: define i8* @_ZN7PR133801fEv
// CHECK: call noalias nonnull i8* @_Znam(
// CHECK: call void @llvm.memset.p0i8
// CHECK-NEXT: call void @_ZN7PR133801BC1Ev
void* f() { return new B[2](); }
}
struct MyPlacementType {} mpt;
void *operator new(size_t, MyPlacementType);
namespace N3664 {
struct S { S() throw(int); };
// CHECK-LABEL: define void @_ZN5N36641fEv
void f() {
// CHECK: call noalias nonnull i8* @_Znwm(i64 4) [[ATTR_BUILTIN_NEW:#[^ ]*]]
int *p = new int; // expected-note {{allocated with 'new' here}}
// CHECK: call void @_ZdlPv({{.*}}) [[ATTR_BUILTIN_DELETE:#[^ ]*]]
delete p;
// CHECK: call noalias nonnull i8* @_Znam(i64 12) [[ATTR_BUILTIN_NEW]]
int *q = new int[3];
// CHECK: call void @_ZdaPv({{.*}}) [[ATTR_BUILTIN_DELETE]]
delete[] p; // expected-warning {{'delete[]' applied to a pointer that was allocated with 'new'; did you mean 'delete'?}}
// CHECK: call noalias i8* @_ZnamRKSt9nothrow_t(i64 3, {{.*}}) [[ATTR_BUILTIN_NOTHROW_NEW:#[^ ]*]]
(void) new (nothrow) S[3];
// CHECK: call i8* @_Znwm15MyPlacementType(i64 4){{$}}
(void) new (mpt) int;
}
// CHECK: declare i8* @_ZnamRKSt9nothrow_t(i64, {{.*}}) [[ATTR_NOBUILTIN_NOUNWIND_ALLOCSIZE:#[^ ]*]]
// CHECK-LABEL: define void @_ZN5N36641gEv
void g() {
// It's OK for there to be attributes here, so long as we don't have a
// 'builtin' attribute.
// CHECK: call noalias nonnull i8* @_Znwm(i64 4) {{#[^ ]*}}{{$}}
int *p = (int*)operator new(4);
// CHECK: call void @_ZdlPv({{.*}}) [[ATTR_NOUNWIND:#[^ ]*]]
operator delete(p);
// CHECK: call noalias nonnull i8* @_Znam(i64 12) {{#[^ ]*}}{{$}}
int *q = (int*)operator new[](12);
// CHECK: call void @_ZdaPv({{.*}}) [[ATTR_NOUNWIND]]
operator delete [](p);
// CHECK: call noalias i8* @_ZnamRKSt9nothrow_t(i64 3, {{.*}}) [[ATTR_NOUNWIND_ALLOCSIZE:#[^ ]*]]
(void) operator new[](3, nothrow);
}
}
namespace builtins {
// CHECK-LABEL: define void @_ZN8builtins1fEv
void f() {
// CHECK: call noalias nonnull i8* @_Znwm(i64 4) [[ATTR_BUILTIN_NEW]]
// CHECK: call void @_ZdlPv({{.*}}) [[ATTR_BUILTIN_DELETE]]
__builtin_operator_delete(__builtin_operator_new(4));
}
}
// CHECK-DAG: attributes [[ATTR_NOBUILTIN]] = {{[{].*}} nobuiltin allocsize(0) {{.*[}]}}
// CHECK-DAG: attributes [[ATTR_NOBUILTIN_NOUNWIND]] = {{[{].*}} nobuiltin nounwind {{.*[}]}}
// CHECK-DAG: attributes [[ATTR_NOBUILTIN_NOUNWIND_ALLOCSIZE]] = {{[{].*}} nobuiltin nounwind allocsize(0) {{.*[}]}}
// CHECK-DAG: attributes [[ATTR_BUILTIN_NEW]] = {{[{].*}} builtin {{.*[}]}}
// CHECK-DAG: attributes [[ATTR_BUILTIN_DELETE]] = {{[{].*}} builtin {{.*[}]}}
// The ([^b}|...) monstrosity is matching a character that's not the start of 'builtin'.
// Add more letters if this matches some other attribute.
// CHECK-DAG: attributes [[ATTR_NOUNWIND]] = {{([^b]|b[^u]|bu[^i]|bui[^l])*}} nounwind {{([^b]|b[^u]|bu[^i]|bui[^l])*$}}
// CHECK-DAG: attributes [[ATTR_NOUNWIND_ALLOCSIZE]] = {{([^b]|b[^u]|bu[^i]|bui[^l])*}} nounwind allocsize(0) {{([^b]|b[^u]|bu[^i]|bui[^l])*$}}
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