[clang] [clang][Interp] Compile field+base destruction into class dtor func (PR #102871)
Timm Baeder via cfe-commits
cfe-commits at lists.llvm.org
Mon Aug 12 05:51:56 PDT 2024
https://github.com/tbaederr updated https://github.com/llvm/llvm-project/pull/102871
>From 3c780a997df63f6c60d25d34067675af30c9ca02 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timm=20B=C3=A4der?= <tbaeder at redhat.com>
Date: Mon, 12 Aug 2024 11:45:27 +0200
Subject: [PATCH] [clang][Interp] Compile field+base destruction into class
dtor func
---
clang/lib/AST/Interp/Compiler.cpp | 97 +++++++++++++++++-----------
clang/lib/AST/Interp/Compiler.h | 1 +
clang/lib/AST/Interp/Interp.cpp | 24 -------
clang/test/AST/Interp/cxx20.cpp | 3 +-
clang/test/AST/Interp/new-delete.cpp | 5 +-
clang/test/AST/Interp/records.cpp | 31 +++++++++
6 files changed, 93 insertions(+), 68 deletions(-)
diff --git a/clang/lib/AST/Interp/Compiler.cpp b/clang/lib/AST/Interp/Compiler.cpp
index dd24cff1bab46e..d32b595f9f0724 100644
--- a/clang/lib/AST/Interp/Compiler.cpp
+++ b/clang/lib/AST/Interp/Compiler.cpp
@@ -4856,6 +4856,50 @@ bool Compiler<Emitter>::compileConstructor(const CXXConstructorDecl *Ctor) {
return this->emitRetVoid(SourceInfo{});
}
+template <class Emitter>
+bool Compiler<Emitter>::compileDestructor(const CXXDestructorDecl *Dtor) {
+ const RecordDecl *RD = Dtor->getParent();
+ const Record *R = this->getRecord(RD);
+ if (!R)
+ return false;
+
+ if (!Dtor->isTrivial() && Dtor->getBody()) {
+ if (!this->visitStmt(Dtor->getBody()))
+ return false;
+ }
+
+ if (!this->emitThis(Dtor))
+ return false;
+
+ assert(R);
+ if (!R->isUnion()) {
+ // First, destroy all fields.
+ for (const Record::Field &Field : llvm::reverse(R->fields())) {
+ const Descriptor *D = Field.Desc;
+ if (!D->isPrimitive() && !D->isPrimitiveArray()) {
+ if (!this->emitGetPtrField(Field.Offset, SourceInfo{}))
+ return false;
+ if (!this->emitDestruction(D))
+ return false;
+ if (!this->emitPopPtr(SourceInfo{}))
+ return false;
+ }
+ }
+ }
+
+ for (const Record::Base &Base : llvm::reverse(R->bases())) {
+ if (!this->emitGetPtrBase(Base.Offset, SourceInfo{}))
+ return false;
+ if (!this->emitRecordDestruction(Base.R))
+ return false;
+ if (!this->emitPopPtr(SourceInfo{}))
+ return false;
+ }
+
+ // FIXME: Virtual bases.
+ return this->emitPopPtr(Dtor) && this->emitRetVoid(Dtor);
+}
+
template <class Emitter>
bool Compiler<Emitter>::visitFunc(const FunctionDecl *F) {
// Classify the return type.
@@ -4863,6 +4907,8 @@ bool Compiler<Emitter>::visitFunc(const FunctionDecl *F) {
if (const auto *Ctor = dyn_cast<CXXConstructorDecl>(F))
return this->compileConstructor(Ctor);
+ if (const auto *Dtor = dyn_cast<CXXDestructorDecl>(F))
+ return this->compileDestructor(Dtor);
// Emit custom code if this is a lambda static invoker.
if (const auto *MD = dyn_cast<CXXMethodDecl>(F);
@@ -5573,46 +5619,19 @@ bool Compiler<Emitter>::emitComplexComparison(const Expr *LHS, const Expr *RHS,
template <class Emitter>
bool Compiler<Emitter>::emitRecordDestruction(const Record *R) {
assert(R);
- if (!R->isUnion()) {
- // First, destroy all fields.
- for (const Record::Field &Field : llvm::reverse(R->fields())) {
- const Descriptor *D = Field.Desc;
- if (!D->isPrimitive() && !D->isPrimitiveArray()) {
- if (!this->emitGetPtrField(Field.Offset, SourceInfo{}))
- return false;
- if (!this->emitDestruction(D))
- return false;
- if (!this->emitPopPtr(SourceInfo{}))
- return false;
- }
- }
- }
-
- // Now emit the destructor and recurse into base classes.
- if (const CXXDestructorDecl *Dtor = R->getDestructor();
- Dtor && !Dtor->isTrivial()) {
- const Function *DtorFunc = getFunction(Dtor);
- if (!DtorFunc)
- return false;
- assert(DtorFunc->hasThisPointer());
- assert(DtorFunc->getNumParams() == 1);
- if (!this->emitDupPtr(SourceInfo{}))
- return false;
- if (!this->emitCall(DtorFunc, 0, SourceInfo{}))
- return false;
- }
-
- for (const Record::Base &Base : llvm::reverse(R->bases())) {
- if (!this->emitGetPtrBase(Base.Offset, SourceInfo{}))
- return false;
- if (!this->emitRecordDestruction(Base.R))
- return false;
- if (!this->emitPopPtr(SourceInfo{}))
- return false;
- }
+ const CXXDestructorDecl *Dtor = R->getDestructor();
+ if (!Dtor || Dtor->isTrivial())
+ return true;
- // FIXME: Virtual bases.
- return true;
+ assert(Dtor);
+ const Function *DtorFunc = getFunction(Dtor);
+ if (!DtorFunc)
+ return false;
+ assert(DtorFunc->hasThisPointer());
+ assert(DtorFunc->getNumParams() == 1);
+ if (!this->emitDupPtr(SourceInfo{}))
+ return false;
+ return this->emitCall(DtorFunc, 0, SourceInfo{});
}
/// When calling this, we have a pointer of the local-to-destroy
/// on the stack.
diff --git a/clang/lib/AST/Interp/Compiler.h b/clang/lib/AST/Interp/Compiler.h
index d94d3613775a19..112219c49e8bdd 100644
--- a/clang/lib/AST/Interp/Compiler.h
+++ b/clang/lib/AST/Interp/Compiler.h
@@ -358,6 +358,7 @@ class Compiler : public ConstStmtVisitor<Compiler<Emitter>, bool>,
const QualType DerivedType);
bool emitLambdaStaticInvokerBody(const CXXMethodDecl *MD);
bool compileConstructor(const CXXConstructorDecl *Ctor);
+ bool compileDestructor(const CXXDestructorDecl *Dtor);
bool checkLiteralType(const Expr *E);
diff --git a/clang/lib/AST/Interp/Interp.cpp b/clang/lib/AST/Interp/Interp.cpp
index 13390007fde33c..49a90edf8917c7 100644
--- a/clang/lib/AST/Interp/Interp.cpp
+++ b/clang/lib/AST/Interp/Interp.cpp
@@ -867,23 +867,6 @@ static bool runRecordDestructor(InterpState &S, CodePtr OpPC,
return false;
}
- // Fields.
- for (const Record::Field &Field : llvm::reverse(R->fields())) {
- const Descriptor *D = Field.Desc;
- if (D->isRecord()) {
- if (!runRecordDestructor(S, OpPC, BasePtr.atField(Field.Offset), D))
- return false;
- } else if (D->isCompositeArray()) {
- const Descriptor *ElemDesc = Desc->ElemDesc;
- assert(ElemDesc->isRecord());
- for (unsigned I = 0; I != Desc->getNumElems(); ++I) {
- if (!runRecordDestructor(S, OpPC, BasePtr.atIndex(I).narrow(),
- ElemDesc))
- return false;
- }
- }
- }
-
// Destructor of this record.
if (const CXXDestructorDecl *Dtor = R->getDestructor();
Dtor && !Dtor->isTrivial()) {
@@ -895,13 +878,6 @@ static bool runRecordDestructor(InterpState &S, CodePtr OpPC,
if (!Call(S, OpPC, DtorFunc, 0))
return false;
}
-
- // Bases.
- for (const Record::Base &Base : llvm::reverse(R->bases())) {
- if (!runRecordDestructor(S, OpPC, BasePtr.atField(Base.Offset), Base.Desc))
- return false;
- }
-
return true;
}
diff --git a/clang/test/AST/Interp/cxx20.cpp b/clang/test/AST/Interp/cxx20.cpp
index 389d9d883725f4..77a967d42c4efe 100644
--- a/clang/test/AST/Interp/cxx20.cpp
+++ b/clang/test/AST/Interp/cxx20.cpp
@@ -859,7 +859,6 @@ namespace DefinitionLoc {
// both-note {{non-constexpr constructor}}
}
-/// FIXME: Call base dtors when explicitly calling dtor.
namespace VirtDtor {
class B {
public:
@@ -900,5 +899,5 @@ namespace VirtDtor {
return buff[0] == a && buff[1] == b;
}
- static_assert(test('C', 'B')); // expected-error {{failed}}
+ static_assert(test('C', 'B'));
}
diff --git a/clang/test/AST/Interp/new-delete.cpp b/clang/test/AST/Interp/new-delete.cpp
index 325ce27c6d51da..6bb30bc19f110c 100644
--- a/clang/test/AST/Interp/new-delete.cpp
+++ b/clang/test/AST/Interp/new-delete.cpp
@@ -514,8 +514,7 @@ namespace DeleteRunsDtors {
static_assert(abc2() == 1);
}
-/// FIXME: There is a slight difference in diagnostics here, because we don't
-/// create a new frame when we delete record fields or bases at all.
+/// FIXME: There is a slight difference in diagnostics here.
namespace FaultyDtorCalledByDelete {
struct InnerFoo {
int *mem;
@@ -536,7 +535,7 @@ namespace FaultyDtorCalledByDelete {
a = new int(13);
IF.mem = new int(100);
}
- constexpr ~Foo() { delete a; }
+ constexpr ~Foo() { delete a; } // expected-note {{in call to}}
};
constexpr int abc() {
diff --git a/clang/test/AST/Interp/records.cpp b/clang/test/AST/Interp/records.cpp
index e620bf9e0e041e..3ab05ea85040c2 100644
--- a/clang/test/AST/Interp/records.cpp
+++ b/clang/test/AST/Interp/records.cpp
@@ -1596,3 +1596,34 @@ namespace VirtDtor {
static_assert(virt_dtor(0, "ZYX"));
}
#endif
+
+namespace DtorDestroysFieldsAfterSelf {
+ struct S {
+ int a = 10;
+ constexpr ~S() {
+ a = 0;
+ }
+
+ };
+ struct F {
+ S s;
+ int a;
+ int &b;
+ constexpr F(int a, int &b) : a(a), b(b) {}
+ constexpr ~F() {
+ b += s.a;
+ }
+ };
+
+ constexpr int foo() {
+ int a = 10;
+ int b = 5;
+ {
+ F f(a, b);
+ }
+
+ return b;
+ }
+
+ static_assert(foo() == 15);
+}
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