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llvm-project/clang/test/CodeGenCXX/implicit-copy-constructor.cpp

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When deciding whether to convert an array construction loop into a memcpy, look at whether the *selected* constructor would be trivial rather than considering whether the array's element type has *any* non-trivial constructors of the relevant kind. llvm-svn: 167562
2012-11-08 07:56:21 +08:00
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -o - %s -std=c++11 | FileCheck %s
Reimplement code generation for copying fields in the implicitly-generated copy constructor. Previously, Sema would perform some checking and instantiation to determine which copy constructors, etc., would be called, then CodeGen would attempt to figure out which copy constructor to call... but would get it wrong, or poke at an uninstantiated default argument, or fail in other ways. The new scheme is similar to what we now do for the implicit copy-assignment operator, where Sema performs all of the semantic analysis and builds specific ASTs that look similar to the ASTs we'd get from explicitly writing the copy constructor, so that CodeGen need only do a direct translation. However, it's not quite that simple because one cannot explicit write elementwise copy-construction of an array. So, I've extended CXXBaseOrMemberInitializer to contain a list of indexing variables used to copy-construct the elements. For example, if we have: struct A { A(const A&); }; struct B { A array[2][3]; }; then we generate an implicit copy assignment operator for B that looks something like this: B::B(const B &other) : array[i0][i1](other.array[i0][i1]) { } CodeGen will loop over the invented variables i0 and i1 to visit all elements in the array, so that each element in the destination array will be copy-constructed from the corresponding element in the source array. Of course, if we're dealing with arrays of scalars or class types with trivial copy-assignment operators, we just generate a memcpy rather than a loop. Fixes PR6928, PR5989, and PR6887. Boost.Regex now compiles and passes all of its regression tests. Conspicuously missing from this patch is handling for the exceptional case, where we need to destruct those objects that we have constructed. I'll address that case separately. llvm-svn: 103079
2010-05-05 13:51:00 +08:00
struct A {
A();
A(const A&);
A(A&);
~A();
};
struct B {
B();
B(B&);
};
struct C {
C() {}
C(C& other, A a = A());
int i, j;
};
struct POD {
int array[3][4];
};
struct D : A, B, virtual C {
D();
int scalar;
int scalar_array[2][3];
B class_member;
C class_member_array[2][3];
POD pod_array[2][3];
union {
int x;
float f[3];
};
};
void f(D d) {
D d2(d);
}
[CodeGenCXX] Treat 'this' as noalias in constructors This is currently a clang extension and a resolution of the defect report in the C++ Standard. Differential Revision: https://reviews.llvm.org/D46441 llvm-svn: 344150
2018-10-11 00:14:51 +08:00
// CHECK-LABEL: define linkonce_odr void @_ZN1DC1ERS_(%struct.D* noalias %this, %struct.D* dereferenceable({{[0-9]+}})) unnamed_addr
Reimplement code generation for copying fields in the implicitly-generated copy constructor. Previously, Sema would perform some checking and instantiation to determine which copy constructors, etc., would be called, then CodeGen would attempt to figure out which copy constructor to call... but would get it wrong, or poke at an uninstantiated default argument, or fail in other ways. The new scheme is similar to what we now do for the implicit copy-assignment operator, where Sema performs all of the semantic analysis and builds specific ASTs that look similar to the ASTs we'd get from explicitly writing the copy constructor, so that CodeGen need only do a direct translation. However, it's not quite that simple because one cannot explicit write elementwise copy-construction of an array. So, I've extended CXXBaseOrMemberInitializer to contain a list of indexing variables used to copy-construct the elements. For example, if we have: struct A { A(const A&); }; struct B { A array[2][3]; }; then we generate an implicit copy assignment operator for B that looks something like this: B::B(const B &other) : array[i0][i1](other.array[i0][i1]) { } CodeGen will loop over the invented variables i0 and i1 to visit all elements in the array, so that each element in the destination array will be copy-constructed from the corresponding element in the source array. Of course, if we're dealing with arrays of scalars or class types with trivial copy-assignment operators, we just generate a memcpy rather than a loop. Fixes PR6928, PR5989, and PR6887. Boost.Regex now compiles and passes all of its regression tests. Conspicuously missing from this patch is handling for the exceptional case, where we need to destruct those objects that we have constructed. I'll address that case separately. llvm-svn: 103079
2010-05-05 13:51:00 +08:00
// CHECK: call void @_ZN1AC1Ev
// CHECK: call void @_ZN1CC2ERS_1A
// CHECK: call void @_ZN1AD1Ev
// CHECK: call void @_ZN1AC2ERS_
// CHECK: call void @_ZN1BC2ERS_
Re-apply r174919 - smarter copy/move assignment/construction, with fixes for bitfield related issues. The original commit broke Takumi's builder. The bug was caused by bitfield sizes being determined by their underlying type, rather than the field info. A similar issue with bitfield alignments showed up on closer testing. Both have been fixed in this patch. llvm-svn: 175389
2013-02-17 15:22:09 +08:00
// CHECK: {{call void @llvm.memcpy.p0i8.p0i8.i64.*i64 28}}
Reimplement code generation for copying fields in the implicitly-generated copy constructor. Previously, Sema would perform some checking and instantiation to determine which copy constructors, etc., would be called, then CodeGen would attempt to figure out which copy constructor to call... but would get it wrong, or poke at an uninstantiated default argument, or fail in other ways. The new scheme is similar to what we now do for the implicit copy-assignment operator, where Sema performs all of the semantic analysis and builds specific ASTs that look similar to the ASTs we'd get from explicitly writing the copy constructor, so that CodeGen need only do a direct translation. However, it's not quite that simple because one cannot explicit write elementwise copy-construction of an array. So, I've extended CXXBaseOrMemberInitializer to contain a list of indexing variables used to copy-construct the elements. For example, if we have: struct A { A(const A&); }; struct B { A array[2][3]; }; then we generate an implicit copy assignment operator for B that looks something like this: B::B(const B &other) : array[i0][i1](other.array[i0][i1]) { } CodeGen will loop over the invented variables i0 and i1 to visit all elements in the array, so that each element in the destination array will be copy-constructed from the corresponding element in the source array. Of course, if we're dealing with arrays of scalars or class types with trivial copy-assignment operators, we just generate a memcpy rather than a loop. Fixes PR6928, PR5989, and PR6887. Boost.Regex now compiles and passes all of its regression tests. Conspicuously missing from this patch is handling for the exceptional case, where we need to destruct those objects that we have constructed. I'll address that case separately. llvm-svn: 103079
2010-05-05 13:51:00 +08:00
// CHECK: call void @_ZN1BC1ERS_
Remove custom handling of array copies in lambda by-value array capture and copy constructors of classes with array members, instead using ArrayInitLoopExpr to represent the initialization loop. This exposed a bug in the static analyzer where it was unable to differentiate between zero-initialized and unknown array values, which has also been fixed here. llvm-svn: 289618
2016-12-14 08:03:17 +08:00
// CHECK: br label
Reimplement code generation for copying fields in the implicitly-generated copy constructor. Previously, Sema would perform some checking and instantiation to determine which copy constructors, etc., would be called, then CodeGen would attempt to figure out which copy constructor to call... but would get it wrong, or poke at an uninstantiated default argument, or fail in other ways. The new scheme is similar to what we now do for the implicit copy-assignment operator, where Sema performs all of the semantic analysis and builds specific ASTs that look similar to the ASTs we'd get from explicitly writing the copy constructor, so that CodeGen need only do a direct translation. However, it's not quite that simple because one cannot explicit write elementwise copy-construction of an array. So, I've extended CXXBaseOrMemberInitializer to contain a list of indexing variables used to copy-construct the elements. For example, if we have: struct A { A(const A&); }; struct B { A array[2][3]; }; then we generate an implicit copy assignment operator for B that looks something like this: B::B(const B &other) : array[i0][i1](other.array[i0][i1]) { } CodeGen will loop over the invented variables i0 and i1 to visit all elements in the array, so that each element in the destination array will be copy-constructed from the corresponding element in the source array. Of course, if we're dealing with arrays of scalars or class types with trivial copy-assignment operators, we just generate a memcpy rather than a loop. Fixes PR6928, PR5989, and PR6887. Boost.Regex now compiles and passes all of its regression tests. Conspicuously missing from this patch is handling for the exceptional case, where we need to destruct those objects that we have constructed. I'll address that case separately. llvm-svn: 103079
2010-05-05 13:51:00 +08:00
// CHECK: call void @_ZN1AC1Ev
// CHECK: call void @_ZN1CC1ERS_1A
// CHECK: call void @_ZN1AD1Ev
Remove custom handling of array copies in lambda by-value array capture and copy constructors of classes with array members, instead using ArrayInitLoopExpr to represent the initialization loop. This exposed a bug in the static analyzer where it was unable to differentiate between zero-initialized and unknown array values, which has also been fixed here. llvm-svn: 289618
2016-12-14 08:03:17 +08:00
// CHECK: {{icmp eq.*, 3}}
// CHECK: br i1
// CHECK: {{icmp eq.*, 2}}
// CHECK: br i1
Re-apply r174919 - smarter copy/move assignment/construction, with fixes for bitfield related issues. The original commit broke Takumi's builder. The bug was caused by bitfield sizes being determined by their underlying type, rather than the field info. A similar issue with bitfield alignments showed up on closer testing. Both have been fixed in this patch. llvm-svn: 175389
2013-02-17 15:22:09 +08:00
// CHECK: {{call void @llvm.memcpy.p0i8.p0i8.i64.*i64 300}}
Reimplement code generation for copying fields in the implicitly-generated copy constructor. Previously, Sema would perform some checking and instantiation to determine which copy constructors, etc., would be called, then CodeGen would attempt to figure out which copy constructor to call... but would get it wrong, or poke at an uninstantiated default argument, or fail in other ways. The new scheme is similar to what we now do for the implicit copy-assignment operator, where Sema performs all of the semantic analysis and builds specific ASTs that look similar to the ASTs we'd get from explicitly writing the copy constructor, so that CodeGen need only do a direct translation. However, it's not quite that simple because one cannot explicit write elementwise copy-construction of an array. So, I've extended CXXBaseOrMemberInitializer to contain a list of indexing variables used to copy-construct the elements. For example, if we have: struct A { A(const A&); }; struct B { A array[2][3]; }; then we generate an implicit copy assignment operator for B that looks something like this: B::B(const B &other) : array[i0][i1](other.array[i0][i1]) { } CodeGen will loop over the invented variables i0 and i1 to visit all elements in the array, so that each element in the destination array will be copy-constructed from the corresponding element in the source array. Of course, if we're dealing with arrays of scalars or class types with trivial copy-assignment operators, we just generate a memcpy rather than a loop. Fixes PR6928, PR5989, and PR6887. Boost.Regex now compiles and passes all of its regression tests. Conspicuously missing from this patch is handling for the exceptional case, where we need to destruct those objects that we have constructed. I'll address that case separately. llvm-svn: 103079
2010-05-05 13:51:00 +08:00
// CHECK: ret void
template<class T> struct X0 { void f0(T * ) { } };
template <class > struct X1 { X1( X1& , int = 0 ) { } };
struct X2 { X1<int> result; };
void test_X2()
{
typedef X2 impl;
typedef X0<impl> pimpl;
impl* i;
pimpl pdata;
pdata.f0( new impl(*i));
}
When synthesizing implicit copy/move constructors and copy/move assignment operators, don't make an initializer or sub-operation for zero-width bitfields. llvm-svn: 133221
2011-06-17 08:18:42 +08:00
// rdar://problem/9598341
namespace test3 {
struct A { A(const A&); A&operator=(const A&); };
struct B { A a; unsigned : 0; };
void test(const B &x) {
B y = x;
y = x;
}
}
When deciding whether to convert an array construction loop into a memcpy, look at whether the *selected* constructor would be trivial rather than considering whether the array's element type has *any* non-trivial constructors of the relevant kind. llvm-svn: 167562
2012-11-08 07:56:21 +08:00
namespace test4 {
// When determining whether to implement an array copy as a memcpy, look at
// whether the *selected* constructor is trivial.
struct S {
int arr[5][5];
S(S &);
S(const S &) = default;
};
// CHECK: @_ZN5test42f1
void f1(S a) {
// CHECK-NOT: memcpy
// CHECK: call void @_ZN5test41SC1ERS0_
// CHECK-NOT: memcpy
S b(a);
// CHECK: }
}
// CHECK: @_ZN5test42f2
void f2(const S a) {
// CHECK-NOT: call void @_ZN5test41SC1ERS0_
// CHECK: memcpy
// CHECK-NOT: call void @_ZN5test41SC1ERS0_
S b(a);
// CHECK: }
}
}