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llvm-project/clang/test/AST/ast-dump-for-range-lifetime.cpp
Matheus Izvekov 91cdd35008
[clang] Improve nested name specifier AST representation (#147835) 
This is a major change on how we represent nested name qualifications in
the AST.

* The nested name specifier itself and how it's stored is changed. The
prefixes for types are handled within the type hierarchy, which makes
canonicalization for them super cheap, no memory allocation required.
Also translating a type into nested name specifier form becomes a no-op.
An identifier is stored as a DependentNameType. The nested name
specifier gains a lightweight handle class, to be used instead of
passing around pointers, which is similar to what is implemented for
TemplateName. There is still one free bit available, and this handle can
be used within a PointerUnion and PointerIntPair, which should keep
bit-packing aficionados happy.
* The ElaboratedType node is removed, all type nodes in which it could
previously apply to can now store the elaborated keyword and name
qualifier, tail allocating when present.
* TagTypes can now point to the exact declaration found when producing
these, as opposed to the previous situation of there only existing one
TagType per entity. This increases the amount of type sugar retained,
and can have several applications, for example in tracking module
ownership, and other tools which care about source file origins, such as
IWYU. These TagTypes are lazily allocated, in order to limit the
increase in AST size.

This patch offers a great performance benefit.

It greatly improves compilation time for
[stdexec](https://github.com/NVIDIA/stdexec). For one datapoint, for
`test_on2.cpp` in that project, which is the slowest compiling test,
this patch improves `-c` compilation time by about 7.2%, with the
`-fsyntax-only` improvement being at ~12%.

This has great results on compile-time-tracker as well:

![image](https://github.com/user-attachments/assets/700dce98-2cab-4aa8-97d1-b038c0bee831)

This patch also further enables other optimziations in the future, and
will reduce the performance impact of template specialization resugaring
when that lands.

It has some other miscelaneous drive-by fixes.

About the review: Yes the patch is huge, sorry about that. Part of the
reason is that I started by the nested name specifier part, before the
ElaboratedType part, but that had a huge performance downside, as
ElaboratedType is a big performance hog. I didn't have the steam to go
back and change the patch after the fact.

There is also a lot of internal API changes, and it made sense to remove
ElaboratedType in one go, versus removing it from one type at a time, as
that would present much more churn to the users. Also, the nested name
specifier having a different API avoids missing changes related to how
prefixes work now, which could make existing code compile but not work.

How to review: The important changes are all in
`clang/include/clang/AST` and `clang/lib/AST`, with also important
changes in `clang/lib/Sema/TreeTransform.h`.

The rest and bulk of the changes are mostly consequences of the changes
in API.

PS: TagType::getDecl is renamed to `getOriginalDecl` in this patch, just
for easier to rebasing. I plan to rename it back after this lands.

Fixes #136624
Fixes https://github.com/llvm/llvm-project/issues/43179
Fixes https://github.com/llvm/llvm-project/issues/68670
Fixes https://github.com/llvm/llvm-project/issues/92757
2025-08-09 05:06:53 -03:00

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// RUN: %clang_cc1 -std=c++23 -triple x86_64-linux-gnu -fcxx-exceptions -ast-dump %s \
// RUN: | FileCheck -strict-whitespace %s
namespace P2718R0 {
// Test basic
struct A {
int a[3] = {1, 2, 3};
A() {}
~A() {}
const int *begin() const { return a; }
const int *end() const { return a + 3; }
A& r() { return *this; }
A g() { return A(); }
};
A g() { return A(); }
const A &f1(const A &t) { return t; }
void test1() {
[[maybe_unused]] int sum = 0;
// CHECK: FunctionDecl {{.*}} test1 'void ()'
// CHECK: | `-CXXForRangeStmt {{.*}}
// CHECK-NEXT: | |-<<<NULL>>>
// CHECK-NEXT: | |-DeclStmt {{.*}}
// CHECK-NEXT: | | `-VarDecl {{.*}} implicit used __range1 'const A &' cinit
// CHECK-NEXT: | | `-ExprWithCleanups {{.*}} 'const A' lvalue
// CHECK-NEXT: | | `-CallExpr {{.*}} 'const A' lvalue
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'const A &(*)(const A &)' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'const A &(const A &)' lvalue Function {{.*}} 'f1' 'const A &(const A &)'
// CHECK-NEXT: | | `-MaterializeTemporaryExpr {{.*}} 'const A' lvalue extended by Var {{.*}} '__range1' 'const A &'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const A' <NoOp>
// CHECK-NEXT: | | `-CXXBindTemporaryExpr {{.*}} 'A' (CXXTemporary {{.*}})
// CHECK-NEXT: | | `-CallExpr {{.*}} 'A'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'A (*)()' <FunctionToPointerDecay>
// CHECK-NEXT: | | `-DeclRefExpr {{.*}} 'A ()' lvalue Function {{.*}} 'g' 'A ()'
for (auto e : f1(g()))
sum += e;
}
struct B : A {};
int (&f(const A *))[3];
const A *g(const A &);
void bar(int) {}
void test2() {
// CHECK: FunctionDecl {{.*}} test2 'void ()'
// CHECK: | `-CXXForRangeStmt {{.*}}
// CHECK-NEXT: | |-<<<NULL>>>
// CHECK-NEXT: | |-DeclStmt {{.*}}
// CHECK-NEXT: | | `-VarDecl {{.*}} implicit used __range1 'int (&)[3]' cinit
// CHECK-NEXT: | | `-ExprWithCleanups {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | | `-CallExpr {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'int (&(*)(const A *))[3]' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'int (&(const A *))[3]' lvalue Function {{.*}} 'f' 'int (&(const A *))[3]'
// CHECK-NEXT: | | `-CallExpr {{.*}} 'const A *'
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'const A *(*)(const A &)' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'const A *(const A &)' lvalue Function {{.*}} 'g' 'const A *(const A &)'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const A' lvalue <DerivedToBase (A)>
// CHECK-NEXT: | | `-MaterializeTemporaryExpr {{.*}} 'const B' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const B' <NoOp>
// CHECK-NEXT: | | `-CXXBindTemporaryExpr {{.*}} 'B' (CXXTemporary {{.*}})
// CHECK-NEXT: | | `-CXXTemporaryObjectExpr {{.*}} 'B' 'void () noexcept(false)' zeroing
for (auto e : f(g(B())))
bar(e);
}
// Test discard statement.
struct LockGuard {
LockGuard() {}
~LockGuard() {}
};
void test3() {
int v[] = {42, 17, 13};
// CHECK: FunctionDecl {{.*}} test3 'void ()'
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __range1 'int (&)[3]' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | `-BinaryOperator {{.*}} 'int[3]' lvalue ','
// CHECK-NEXT: | |-CXXStaticCastExpr {{.*}} 'void' static_cast<void> <ToVoid>
// CHECK-NEXT: | | `-MaterializeTemporaryExpr {{.*}} 'LockGuard' xvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | `-CXXBindTemporaryExpr {{.*}} 'LockGuard' (CXXTemporary {{.*}})
// CHECK-NEXT: | | `-CXXTemporaryObjectExpr {{.*}} 'LockGuard' 'void ()'
// CHECK-NEXT: | `-DeclRefExpr {{.*}} 'int[3]' lvalue Var {{.*}} 'v' 'int[3]'
for ([[maybe_unused]] int x : static_cast<void>(LockGuard()), v)
LockGuard guard;
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __range1 'int (&)[3]' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | `-BinaryOperator {{.*}} 'int[3]' lvalue ','
// CHECK-NEXT: | |-CStyleCastExpr {{.*}} 'void' <ToVoid>
// CHECK-NEXT: | | `-MaterializeTemporaryExpr {{.*}} 'LockGuard' xvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | `-CXXBindTemporaryExpr {{.*}} 'LockGuard' (CXXTemporary {{.*}})
// CHECK-NEXT: | | `-CXXTemporaryObjectExpr {{.*}} 'LockGuard' 'void ()'
// CHECK-NEXT: | `-DeclRefExpr {{.*}} 'int[3]' lvalue Var {{.*}} 'v' 'int[3]'
for ([[maybe_unused]] int x : (void)LockGuard(), v)
LockGuard guard;
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __range1 'int (&)[3]' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | `-BinaryOperator {{.*}} 'int[3]' lvalue ','
// CHECK-NEXT: | |-MaterializeTemporaryExpr {{.*}} 'LockGuard' xvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | `-CXXBindTemporaryExpr {{.*}} 'LockGuard' (CXXTemporary {{.*}})
// CHECK-NEXT: | | `-CXXTemporaryObjectExpr {{.*}} 'LockGuard' 'void ()'
// CHECK-NEXT: | `-DeclRefExpr {{.*}} 'int[3]' lvalue Var {{.*}} 'v' 'int[3]'
for ([[maybe_unused]] int x : LockGuard(), v)
LockGuard guard;
}
// Test default arg
int (&default_arg_fn(const A & = A()))[3];
void test4() {
// CHECK: FunctionDecl {{.*}} test4 'void ()'
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl{{.*}} implicit used __range1 'int (&)[3]' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | `-CallExpr {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | |-ImplicitCastExpr {{.*}} 'int (&(*)(const A &))[3]' <FunctionToPointerDecay>
// CHECK-NEXT: | | `-DeclRefExpr {{.*}} 'int (&(const A &))[3]' lvalue Function {{.*}} 'default_arg_fn' 'int (&(const A &))[3]'
// CHECK-NEXT: | `-CXXDefaultArgExpr {{.*}} <<invalid sloc>> 'const A' lvalue has rewritten init
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'const A' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | `-ImplicitCastExpr {{.*}} 'const A' <NoOp>
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'A' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CXXTemporaryObjectExpr {{.*}} 'A' 'void ()'
for (auto e : default_arg_fn())
bar(e);
}
struct DefaultA {
DefaultA() {}
~DefaultA() {}
};
A foo(const A&, const DefaultA &Default = DefaultA()) {
return A();
}
void test5() {
// CHECK: FunctionDecl {{.*}} test5 'void ()'
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __range1 'int (&)[3]' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | `-CallExpr {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | |-ImplicitCastExpr {{.*}} 'int (&(*)(const A &))[3]' <FunctionToPointerDecay>
// CHECK-NEXT: | | `-DeclRefExpr {{.*}} 'int (&(const A &))[3]' lvalue Function {{.*}} 'default_arg_fn' 'int (&(const A &))[3]'
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'const A' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | `-ImplicitCastExpr {{.*}} 'const A' <NoOp>
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'A'
// CHECK-NEXT: | `-CallExpr {{.*}} 'A'
// CHECK-NEXT: | |-ImplicitCastExpr {{.*}} 'A (*)(const A &, const DefaultA &)' <FunctionToPointerDecay>
// CHECK-NEXT: | | `-DeclRefExpr {{.*}} 'A (const A &, const DefaultA &)' lvalue Function {{.*}} 'foo' 'A (const A &, const DefaultA &)'
// CHECK-NEXT: | |-MaterializeTemporaryExpr {{.*}} 'const A' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const A' <NoOp>
// CHECK-NEXT: | | `-CXXBindTemporaryExpr {{.*}} 'A'
// CHECK-NEXT: | | `-CallExpr {{.*}} 'A'
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'A (*)(const A &, const DefaultA &)' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'A (const A &, const DefaultA &)' lvalue Function {{.*}} 'foo' 'A (const A &, const DefaultA &)'
// CHECK-NEXT: | | |-MaterializeTemporaryExpr {{.*}} 'const A' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | | `-ImplicitCastExpr {{.*}} 'const A' <NoOp>
// CHECK-NEXT: | | | `-CXXBindTemporaryExpr {{.*}} 'A'
// CHECK-NEXT: | | | `-CallExpr {{.*}} 'A'
// CHECK-NEXT: | | | |-ImplicitCastExpr {{.*}} 'A (*)(const A &, const DefaultA &)' <FunctionToPointerDecay>
// CHECK-NEXT: | | | | `-DeclRefExpr {{.*}} 'A (const A &, const DefaultA &)' lvalue Function {{.*}} 'foo' 'A (const A &, const DefaultA &)'
// CHECK-NEXT: | | | |-MaterializeTemporaryExpr {{.*}} 'const A' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | | | `-ImplicitCastExpr {{.*}} 'const A' <NoOp>
// CHECK-NEXT: | | | | `-CXXBindTemporaryExpr {{.*}} 'A'
// CHECK-NEXT: | | | | `-CXXTemporaryObjectExpr {{.*}} 'A' 'void ()'
// CHECK-NEXT: | | | `-CXXDefaultArgExpr {{.*}} <<invalid sloc>> 'const DefaultA' lvalue has rewritten init
// CHECK-NEXT: | | | `-MaterializeTemporaryExpr {{.*}} 'const DefaultA' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | | `-ImplicitCastExpr {{.*}} 'const DefaultA' <NoOp>
// CHECK-NEXT: | | | `-CXXBindTemporaryExpr {{.*}} 'DefaultA' (CXXTemporary {{.*}})
// CHECK-NEXT: | | | `-CXXTemporaryObjectExpr {{.*}} 'DefaultA' 'void ()'
// CHECK-NEXT: | | `-CXXDefaultArgExpr {{.*}} <<invalid sloc>> 'const DefaultA' lvalue has rewritten init
// CHECK-NEXT: | | `-MaterializeTemporaryExpr {{.*}} 'const DefaultA' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const DefaultA' <NoOp>
// CHECK-NEXT: | | `-CXXBindTemporaryExpr {{.*}} 'DefaultA' (CXXTemporary {{.*}})
// CHECK-NEXT: | | `-CXXTemporaryObjectExpr {{.*}} 'DefaultA' 'void ()'
// CHECK-NEXT: | `-CXXDefaultArgExpr {{.*}} <<invalid sloc>> 'const DefaultA' lvalue has rewritten init
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'const DefaultA' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | `-ImplicitCastExpr {{.*}} 'const DefaultA' <NoOp>
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'DefaultA' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CXXTemporaryObjectExpr {{.*}} 'DefaultA' 'void ()'
for (auto e : default_arg_fn(foo(foo(foo(A())))))
bar(e);
}
struct C : public A {
C() {}
C(int, const C &, const DefaultA & = DefaultA()) {}
};
void test6() {
// CHECK: FunctionDecl {{.*}} test6 'void ()'
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} col:17 implicit used __range1 'C &&' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'C' xvalue
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'C' xvalue extended by Var {{.*}} '__range1' 'C &&'
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'C'
// CHECK-NEXT: | `-CXXTemporaryObjectExpr {{.*}} 'C' 'void (int, const C &, const DefaultA &)'
// CHECK-NEXT: | |-IntegerLiteral {{.*}}'int' 0
// CHECK-NEXT: | |-MaterializeTemporaryExpr {{.*}} 'const C' lvalue extended by Var {{.*}} '__range1' 'C &&'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const C' <NoOp>
// CHECK-NEXT: | | `-CXXBindTemporaryExpr {{.*}} 'C'
// CHECK-NEXT: | | `-CXXTemporaryObjectExpr {{.*}} 'C' 'void (int, const C &, const DefaultA &)'
// CHECK-NEXT: | | |-IntegerLiteral {{.*}} 'int' 0
// CHECK-NEXT: | | |-MaterializeTemporaryExpr {{.*}} 'const C' lvalue extended by Var {{.*}} '__range1' 'C &&'
// CHECK-NEXT: | | | `-ImplicitCastExpr {{.*}} 'const C' <NoOp>
// CHECK-NEXT: | | | `-CXXBindTemporaryExpr {{.*}} 'C'
// CHECK-NEXT: | | | `-CXXTemporaryObjectExpr {{.*}} 'C' 'void (int, const C &, const DefaultA &)'
// CHECK-NEXT: | | | |-IntegerLiteral {{.*}} 'int' 0
// CHECK-NEXT: | | | |-MaterializeTemporaryExpr {{.*}} 'const C' lvalue extended by Var {{.*}} '__range1' 'C &&'
// CHECK-NEXT: | | | | `-ImplicitCastExpr {{.*}} 'const C' <NoOp>
// CHECK-NEXT: | | | | `-CXXBindTemporaryExpr {{.*}} 'C'
// CHECK-NEXT: | | | | `-CXXTemporaryObjectExpr {{.*}} 'C' 'void ()'
// CHECK-NEXT: | | | `-CXXDefaultArgExpr {{.*}} <<invalid sloc>> 'const DefaultA' lvalue has rewritten init
// CHECK-NEXT: | | | `-MaterializeTemporaryExpr {{.*}} 'const DefaultA' lvalue extended by Var {{.*}} '__range1' 'C &&'
// CHECK-NEXT: | | | `-ImplicitCastExpr {{.*}} 'const DefaultA' <NoOp>
// CHECK-NEXT: | | | `-CXXBindTemporaryExpr {{.*}} 'DefaultA' (CXXTemporary {{.*}})
// CHECK-NEXT: | | | `-CXXTemporaryObjectExpr {{.*}} 'DefaultA' 'void ()'
// CHECK-NEXT: | | `-CXXDefaultArgExpr {{.*}} <<invalid sloc>> 'const DefaultA' lvalue has rewritten init
// CHECK-NEXT: | | `-MaterializeTemporaryExpr {{.*}} 'const DefaultA' lvalue extended by Var {{.*}} '__range1' 'C &&'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const DefaultA' <NoOp>
// CHECK-NEXT: | | `-CXXBindTemporaryExpr {{.*}} 'DefaultA' (CXXTemporary {{.*}})
// CHECK-NEXT: | | `-CXXTemporaryObjectExpr {{.*}} 'DefaultA' 'void ()'
// CHECK-NEXT: | `-CXXDefaultArgExpr {{.*}} <<invalid sloc>> 'const DefaultA' lvalue has rewritten init
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'const DefaultA' lvalue extended by Var {{.*}} '__range1' 'C &&'
// CHECK-NEXT: | `-ImplicitCastExpr {{.*}} 'const DefaultA' <NoOp>
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'DefaultA' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CXXTemporaryObjectExpr {{.*}} 'DefaultA' 'void ()'
for (auto e : C(0, C(0, C(0, C()))))
bar(e);
}
// Test member call
void test7() {
// CHECK: FunctionDecl {{.*}} test7 'void ()'
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __range1 'A &&' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'A' xvalue
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'A' xvalue extended by Var {{.*}} '__range1' 'A &&'
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'A' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CXXMemberCallExpr {{.*}} 'A'
// CHECK-NEXT: | `-MemberExpr {{.*}} '<bound member function type>' .g {{.*}}
// CHECK-NEXT: | `-CXXMemberCallExpr {{.*}} 'A' lvalue
// CHECK-NEXT: | `-MemberExpr {{.*}} '<bound member function type>' .r {{.*}}
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'A' xvalue extended by Var {{.*}} '__range1' 'A &&'
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'A' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CXXMemberCallExpr {{.*}} 'A'
// CHECK-NEXT: | `-MemberExpr {{.*}} '<bound member function type>' .g {{.*}}
// CHECK-NEXT: | `-CXXMemberCallExpr {{.*}} 'A' lvalue
// CHECK-NEXT: | `-MemberExpr {{.*}} '<bound member function type>' .r {{.*}}
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'A' xvalue extended by Var {{.*}} '__range1' 'A &&'
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'A' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CXXMemberCallExpr {{.*}} 'A'
// CHECK-NEXT: | `-MemberExpr {{.*}} '<bound member function type>' .g {{.*}}
// CHECK-NEXT: | `-CXXMemberCallExpr {{.*}} 'A' lvalue
// CHECK-NEXT: | `-MemberExpr {{.*}} '<bound member function type>' .r {{.*}}
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'A' xvalue extended by Var {{.*}} '__range1' 'A &&'
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'A' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CallExpr {{.*}} 'A'
// CHECK-NEXT: | `-ImplicitCastExpr {{.*}} 'A (*)()' <FunctionToPointerDecay>
// CHECK-NEXT: | `-DeclRefExpr {{.*}} 'A ()' lvalue Function {{.*}} 'g' 'A ()'
for (auto e : g().r().g().r().g().r().g())
bar(e);
}
// Test basic && dependent context
template <typename T> T dg() { return T(); }
template <typename T> const T &df1(const T &t) { return t; }
void test8() {
[[maybe_unused]] int sum = 0;
// CHECK: FunctionDecl {{.*}} test8 'void ()'
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __range1 'const P2718R0::A &' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'const P2718R0::A' lvalue
// CHECK-NEXT: | `-CallExpr {{.*}} 'const P2718R0::A' lvalue
// CHECK-NEXT: | |-ImplicitCastExpr {{.*}} 'const P2718R0::A &(*)(const P2718R0::A &)' <FunctionToPointerDecay>
// CHECK-NEXT: | | `-DeclRefExpr {{.*}} 'const P2718R0::A &(const P2718R0::A &)' lvalue Function {{.*}} 'df1' 'const P2718R0::A &(const P2718R0::A &)' (FunctionTemplate {{.*}} 'df1')
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'const P2718R0::A' lvalue extended by Var {{.*}} '__range1' 'const P2718R0::A &'
// CHECK-NEXT: | `-ImplicitCastExpr {{.*}} 'const P2718R0::A' <NoOp>
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'P2718R0::A' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CallExpr {{.*}} 'P2718R0::A'
// CHECK-NEXT: | `-ImplicitCastExpr {{.*}} 'P2718R0::A (*)()' <FunctionToPointerDecay>
// CHECK-NEXT: | `-DeclRefExpr {{.*}} 'P2718R0::A ()' lvalue Function {{.*}} 'dg' 'P2718R0::A ()' (FunctionTemplate {{.*}} 'dg')
for (auto e : df1(dg<A>()))
sum += e;
}
template <typename T> int (&df2(const T *))[3];
const A *dg2(const A &);
void test9() {
// CHECK: FunctionDecl {{.*}} test9 'void ()'
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __range1 'int (&)[3]' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | `-CallExpr {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | |-ImplicitCastExpr {{.*}} 'int (&(*)(const P2718R0::A *))[3]' <FunctionToPointerDecay>
// CHECK-NEXT: | | `-DeclRefExpr {{.*}} 'int (&(const P2718R0::A *))[3]' lvalue Function {{.*}} 'df2' 'int (&(const P2718R0::A *))[3]' (FunctionTemplate {{.*}} 'df2')
// CHECK-NEXT: | `-CallExpr {{.*}} 'const A *'
// CHECK-NEXT: | |-ImplicitCastExpr {{.*}} 'const A *(*)(const A &)' <FunctionToPointerDecay>
// CHECK-NEXT: | | `-DeclRefExpr {{.*}} 'const A *(const A &)' lvalue Function {{.*}} 'dg2' 'const A *(const A &)'
// CHECK-NEXT: | `-ImplicitCastExpr {{.*}} 'const A' lvalue <DerivedToBase (A)>
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'const B' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | `-ImplicitCastExpr {{.*}} 'const B' <NoOp>
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'B' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CXXTemporaryObjectExpr {{.*}} 'B' 'void () noexcept(false)' zeroing
for (auto e : df2(dg2(B())))
bar(e);
}
// Test discard statement && dependent context
void test10() {
int v[] = {42, 17, 13};
// CHECK: FunctionDecl {{.*}} test10 'void ()'
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __range1 'int (&)[3]' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | `-BinaryOperator {{.*}} 'int[3]' lvalue ','
// CHECK-NEXT: | |-CXXStaticCastExpr {{.*}} 'void' static_cast<void> <ToVoid>
// CHECK-NEXT: | | `-CallExpr {{.*}} 'const P2718R0::LockGuard' lvalue
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'const P2718R0::LockGuard &(*)(const P2718R0::LockGuard &)' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'const P2718R0::LockGuard &(const P2718R0::LockGuard &)' lvalue Function {{.*}} 'df1' 'const P2718R0::LockGuard &(const P2718R0::LockGuard &)' (FunctionTemplate {{.*}} 'df1')
// CHECK-NEXT: | | `-MaterializeTemporaryExpr {{.*}} 'const LockGuard' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const LockGuard' <NoOp>
// CHECK-NEXT: | | `-CXXBindTemporaryExpr {{.*}} 'LockGuard' (CXXTemporary {{.*}})
// CHECK-NEXT: | | `-CXXTemporaryObjectExpr {{.*}} 'LockGuard' 'void ()'
// CHECK-NEXT: | `-DeclRefExpr {{.*}} 'int[3]' lvalue Var {{.*}} 'v' 'int[3]'
for ([[maybe_unused]] int x : static_cast<void>(df1(LockGuard())), v)
LockGuard guard;
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __range1 'int (&)[3]' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | `-BinaryOperator {{.*}} 'int[3]' lvalue ','
// CHECK-NEXT: | |-CStyleCastExpr {{.*}} 'void' <ToVoid>
// CHECK-NEXT: | | `-CallExpr {{.*}} 'const P2718R0::LockGuard' lvalue
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'const P2718R0::LockGuard &(*)(const P2718R0::LockGuard &)' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'const P2718R0::LockGuard &(const P2718R0::LockGuard &)' lvalue Function {{.*}} 'df1' 'const P2718R0::LockGuard &(const P2718R0::LockGuard &)' (FunctionTemplate {{.*}} 'df1')
// CHECK-NEXT: | | `-MaterializeTemporaryExpr {{.*}} 'const LockGuard' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const LockGuard' <NoOp>
// CHECK-NEXT: | | `-CXXBindTemporaryExpr {{.*}} 'LockGuard' (CXXTemporary {{.*}})
// CHECK-NEXT: | | `-CXXTemporaryObjectExpr {{.*}} 'LockGuard' 'void ()'
// CHECK-NEXT: | `-DeclRefExpr {{.*}} 'int[3]' lvalue Var {{.*}} 'v' 'int[3]'
for ([[maybe_unused]] int x : (void)df1(LockGuard()), v)
LockGuard guard;
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __range1 'int (&)[3]' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'int[3]' lvalue
// CHECK-NEXT: | `-BinaryOperator {{.*}} 'int[3]' lvalue ','
// CHECK-NEXT: | |-BinaryOperator {{.*}} 'const P2718R0::LockGuard' lvalue ','
// CHECK-NEXT: | | |-CallExpr {{.*}} 'const P2718R0::LockGuard' lvalue
// CHECK-NEXT: | | | |-ImplicitCastExpr {{.*}} 'const P2718R0::LockGuard &(*)(const P2718R0::LockGuard &)' <FunctionToPointerDecay>
// CHECK-NEXT: | | | | `-DeclRefExpr {{.*}} 'const P2718R0::LockGuard &(const P2718R0::LockGuard &)' lvalue Function {{.*}} 'df1' 'const P2718R0::LockGuard &(const P2718R0::LockGuard &)' (FunctionTemplate {{.*}} 'df1')
// CHECK-NEXT: | | | `-MaterializeTemporaryExpr {{.*}} 'const LockGuard' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | | `-ImplicitCastExpr {{.*}} 'const LockGuard' <NoOp>
// CHECK-NEXT: | | | `-CXXBindTemporaryExpr {{.*}} 'LockGuard' (CXXTemporary {{.*}})
// CHECK-NEXT: | | | `-CXXTemporaryObjectExpr {{.*}} 'LockGuard' 'void ()'
// CHECK-NEXT: | | `-CallExpr {{.*}} 'const P2718R0::LockGuard' lvalue
// CHECK-NEXT: | | |-ImplicitCastExpr {{.*}} 'const P2718R0::LockGuard &(*)(const P2718R0::LockGuard &)' <FunctionToPointerDecay>
// CHECK-NEXT: | | | `-DeclRefExpr {{.*}} 'const P2718R0::LockGuard &(const P2718R0::LockGuard &)' lvalue Function {{.*}} 'df1' 'const P2718R0::LockGuard &(const P2718R0::LockGuard &)' (FunctionTemplate {{.*}} 'df1')
// CHECK-NEXT: | | `-MaterializeTemporaryExpr {{.*}} 'const LockGuard' lvalue extended by Var {{.*}} '__range1' 'int (&)[3]'
// CHECK-NEXT: | | `-ImplicitCastExpr {{.*}} 'const LockGuard' <NoOp>
// CHECK-NEXT: | | `-CXXBindTemporaryExpr {{.*}} 'LockGuard' (CXXTemporary {{.*}})
// CHECK-NEXT: | | `-CXXTemporaryObjectExpr {{.*}} 'LockGuard' 'void ()'
// CHECK-NEXT: | `-DeclRefExpr {{.*}} 'int[3]' lvalue Var {{.*}} 'v' 'int[3]'
for ([[maybe_unused]] int x : df1(LockGuard()), df1(LockGuard()), v)
LockGuard guard;
}
// Test default argument && dependent context
template <typename T> int (&default_arg_fn2(const T & = T()))[3];
void test11() {
for (auto e : default_arg_fn2<A>())
bar(e);
}
template <typename T> A foo2(const T&, const DefaultA &Default = DefaultA());
void test12() {
for (auto e : default_arg_fn2(foo2(foo2(foo2(A())))))
bar(e);
}
// Test member call && dependent context
void test13() {
// CHECK: FunctionDecl {{.*}} test13 'void ()'
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __range1 'A &&' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'A' xvalue
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'A' xvalue extended by Var {{.*}} '__range1' 'A &&'
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'A' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CXXMemberCallExpr {{.*}} 'A'
// CHECK-NEXT: | `-MemberExpr {{.*}} '<bound member function type>' .g {{.*}}
// CHECK-NEXT: | `-CXXMemberCallExpr {{.*}} 'A' lvalue
// CHECK-NEXT: | `-MemberExpr {{.*}} '<bound member function type>' .r {{.*}}
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'A' xvalue extended by Var {{.*}} '__range1' 'A &&'
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'A' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CXXMemberCallExpr {{.*}} 'A'
// CHECK-NEXT: | `-MemberExpr {{.*}} '<bound member function type>' .g {{.*}}
// CHECK-NEXT: | `-CXXMemberCallExpr {{.*}} 'A' lvalue
// CHECK-NEXT: | `-MemberExpr {{.*}} '<bound member function type>' .r {{.*}}
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'A' xvalue extended by Var {{.*}} '__range1' 'A &&'
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'A' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CXXMemberCallExpr {{.*}} 'A'
// CHECK-NEXT: | `-MemberExpr {{.*}} '<bound member function type>' .g {{.*}}
// CHECK-NEXT: | `-CXXMemberCallExpr {{.*}} 'A' lvalue
// CHECK-NEXT: | `-MemberExpr {{.*}} '<bound member function type>' .r {{.*}}
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'P2718R0::A' xvalue extended by Var {{.*}} '__range1' 'A &&'
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'P2718R0::A' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-CallExpr {{.*}} 'P2718R0::A'
// CHECK-NEXT: | `-ImplicitCastExpr {{.*}} 'P2718R0::A (*)()' <FunctionToPointerDecay>
// CHECK-NEXT: | `-DeclRefExpr {{.*}} 'P2718R0::A ()' lvalue Function {{.*}} 'dg' 'P2718R0::A ()' (FunctionTemplate {{.*}} 'dg')
for (auto e : dg<A>().r().g().r().g().r().g())
bar(e);
}
extern "C" void exit(int);
struct A14 {
int arr[1];
~A14() noexcept(false) { throw 42; }
};
struct B14 {
int x;
const A14 &a = A14{{0}};
const int *begin() { return a.arr; }
const int *end() { return &a.arr[1]; }
};
void test14() {
// The ExprWithCleanups in CXXDefaultInitExpr will be ignored.
// CHECK: FunctionDecl {{.*}} test14 'void ()'
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} implicit used __range1 'const int (&)[1]' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'const int[1]' lvalue
// CHECK-NEXT: | `-MemberExpr {{.*}} 'const int[1]' lvalue .arr {{.*}}
// CHECK-NEXT: | `-MemberExpr {{.*}} 'const A14' lvalue .a {{.*}}
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'B14' xvalue extended by Var {{.*}} '__range1' 'const int (&)[1]'
// CHECK-NEXT: | `-CXXFunctionalCastExpr {{.*}} 'B14' functional cast to B14 <NoOp>
// CHECK-NEXT: | `-InitListExpr {{.*}} 'B14'
// CHECK-NEXT: | |-IntegerLiteral {{.*}} 'int' 0
// CHECK-NEXT: | `-CXXDefaultInitExpr {{.*}} 'const A14' lvalue has rewritten init
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'const A14' lvalue extended by Var {{.*}} '__range1' 'const int (&)[1]'
// CHECK-NEXT: | `-ImplicitCastExpr {{.*}} 'const A14' <NoOp>
// CHECK-NEXT: | `-CXXFunctionalCastExpr {{.*}} 'A14' functional cast to A14 <NoOp>
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'A14' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-InitListExpr {{.*}} 'A14'
// CHECK-NEXT: | `-InitListExpr {{.*}} 'int[1]'
// CHECK-NEXT: | `-IntegerLiteral {{.*}} 'int' 0
for (auto &&x : B14{0}.a.arr) { exit(0); }
// CHECK: -CXXForRangeStmt {{.*}}
// CHECK-NEXT: |-<<<NULL>>>
// CHECK-NEXT: |-DeclStmt {{.*}}
// CHECK-NEXT: | `-VarDecl {{.*}} col:19 implicit used __range1 'B14 &&' cinit
// CHECK-NEXT: | `-ExprWithCleanups {{.*}} 'B14' xvalue
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'B14' xvalue extended by Var {{.*}} '__range1' 'B14 &&'
// CHECK-NEXT: | `-CXXFunctionalCastExpr {{.*}} 'B14' functional cast to B14 <NoOp>
// CHECK-NEXT: | `-InitListExpr {{.*}} 'B14'
// CHECK-NEXT: | |-IntegerLiteral {{.*}} 'int' 0
// CHECK-NEXT: | `-CXXDefaultInitExpr {{.*}} 'const A14' lvalue has rewritten init
// CHECK-NEXT: | `-MaterializeTemporaryExpr {{.*}} 'const A14' lvalue extended by Var {{.*}} '__range1' 'B14 &&'
// CHECK-NEXT: | `-ImplicitCastExpr {{.*}} 'const A14' <NoOp>
// CHECK-NEXT: | `-CXXFunctionalCastExpr {{.*}} 'A14' functional cast to A14 <NoOp>
// CHECK-NEXT: | `-CXXBindTemporaryExpr {{.*}} 'A14' (CXXTemporary {{.*}})
// CHECK-NEXT: | `-InitListExpr {{.*}} 'A14'
// CHECK-NEXT: | `-InitListExpr {{.*}} 'int[1]'
// CHECK-NEXT: | `-IntegerLiteral {{.*}} 'int' 0
for (auto &&x : B14{0}) { exit(0); }
}
} // namespace P2718R0
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