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//===-- RecordOps.cpp -------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Operations on records (structs, classes, and unions).
//
//===----------------------------------------------------------------------===//
#include "clang/Analysis/FlowSensitive/RecordOps.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclCXX.h"
#include "clang/AST/Type.h"
#define DEBUG_TYPE "dataflow"
namespace clang::dataflow {
static void copyField(const ValueDecl &Field, StorageLocation *SrcFieldLoc,
StorageLocation *DstFieldLoc, RecordStorageLocation &Dst,
Environment &Env) {
assert(Field.getType()->isReferenceType() ||
(SrcFieldLoc != nullptr && DstFieldLoc != nullptr));
if (Field.getType()->isRecordType()) {
copyRecord(cast<RecordStorageLocation>(*SrcFieldLoc),
cast<RecordStorageLocation>(*DstFieldLoc), Env);
} else if (Field.getType()->isReferenceType()) {
Dst.setChild(Field, SrcFieldLoc);
} else {
if (Value *Val = Env.getValue(*SrcFieldLoc))
Env.setValue(*DstFieldLoc, *Val);
else
Env.clearValue(*DstFieldLoc);
}
}
static void copySyntheticField(QualType FieldType, StorageLocation &SrcFieldLoc,
StorageLocation &DstFieldLoc, Environment &Env) {
if (FieldType->isRecordType()) {
copyRecord(cast<RecordStorageLocation>(SrcFieldLoc),
cast<RecordStorageLocation>(DstFieldLoc), Env);
} else {
if (Value *Val = Env.getValue(SrcFieldLoc))
Env.setValue(DstFieldLoc, *Val);
else
Env.clearValue(DstFieldLoc);
}
}
void copyRecord(RecordStorageLocation &Src, RecordStorageLocation &Dst,
Environment &Env, const QualType TypeToCopy) {
auto SrcType = Src.getType().getCanonicalType().getUnqualifiedType();
auto DstType = Dst.getType().getCanonicalType().getUnqualifiedType();
auto SrcDecl = SrcType->getAsCXXRecordDecl();
auto DstDecl = DstType->getAsCXXRecordDecl();
const CXXRecordDecl *DeclToCopy =
TypeToCopy.isNull() ? nullptr : TypeToCopy->getAsCXXRecordDecl();
[[maybe_unused]] bool CompatibleTypes =
SrcType == DstType ||
(SrcDecl != nullptr && DstDecl != nullptr &&
(SrcDecl->isDerivedFrom(DstDecl) || DstDecl->isDerivedFrom(SrcDecl) ||
(DeclToCopy != nullptr && SrcDecl->isDerivedFrom(DeclToCopy) &&
DstDecl->isDerivedFrom(DeclToCopy))));
LLVM_DEBUG({
if (!CompatibleTypes) {
llvm::dbgs() << "Source type " << Src.getType() << "\n";
llvm::dbgs() << "Destination type " << Dst.getType() << "\n";
}
});
assert(CompatibleTypes);
if (SrcType == DstType || (SrcDecl != nullptr && DstDecl != nullptr &&
SrcDecl->isDerivedFrom(DstDecl))) {
for (auto [Field, DstFieldLoc] : Dst.children())
copyField(*Field, Src.getChild(*Field), DstFieldLoc, Dst, Env);
for (const auto &[Name, DstFieldLoc] : Dst.synthetic_fields())
copySyntheticField(DstFieldLoc->getType(), Src.getSyntheticField(Name),
*DstFieldLoc, Env);
} else if (SrcDecl != nullptr && DstDecl != nullptr &&
DstDecl->isDerivedFrom(SrcDecl)) {
for (auto [Field, SrcFieldLoc] : Src.children())
copyField(*Field, SrcFieldLoc, Dst.getChild(*Field), Dst, Env);
for (const auto &[Name, SrcFieldLoc] : Src.synthetic_fields())
copySyntheticField(SrcFieldLoc->getType(), *SrcFieldLoc,
Dst.getSyntheticField(Name), Env);
} else {
for (const FieldDecl *Field :
Env.getDataflowAnalysisContext().getModeledFields(TypeToCopy)) {
copyField(*Field, Src.getChild(*Field), Dst.getChild(*Field), Dst, Env);
}
for (const auto &[SyntheticFieldName, SyntheticFieldType] :
Env.getDataflowAnalysisContext().getSyntheticFields(TypeToCopy)) {
copySyntheticField(SyntheticFieldType,
Src.getSyntheticField(SyntheticFieldName),
Dst.getSyntheticField(SyntheticFieldName), Env);
}
}
}
bool recordsEqual(const RecordStorageLocation &Loc1, const Environment &Env1,
const RecordStorageLocation &Loc2, const Environment &Env2) {
LLVM_DEBUG({
if (Loc2.getType().getCanonicalType().getUnqualifiedType() !=
Loc1.getType().getCanonicalType().getUnqualifiedType()) {
llvm::dbgs() << "Loc1 type " << Loc1.getType() << "\n";
llvm::dbgs() << "Loc2 type " << Loc2.getType() << "\n";
}
});
assert(Loc2.getType().getCanonicalType().getUnqualifiedType() ==
Loc1.getType().getCanonicalType().getUnqualifiedType());
for (auto [Field, FieldLoc1] : Loc1.children()) {
StorageLocation *FieldLoc2 = Loc2.getChild(*Field);
assert(Field->getType()->isReferenceType() ||
(FieldLoc1 != nullptr && FieldLoc2 != nullptr));
if (Field->getType()->isRecordType()) {
if (!recordsEqual(cast<RecordStorageLocation>(*FieldLoc1), Env1,
cast<RecordStorageLocation>(*FieldLoc2), Env2))
return false;
} else if (Field->getType()->isReferenceType()) {
if (FieldLoc1 != FieldLoc2)
return false;
} else if (Env1.getValue(*FieldLoc1) != Env2.getValue(*FieldLoc2)) {
return false;
}
}
for (const auto &[Name, SynthFieldLoc1] : Loc1.synthetic_fields()) {
if (SynthFieldLoc1->getType()->isRecordType()) {
if (!recordsEqual(
*cast<RecordStorageLocation>(SynthFieldLoc1), Env1,
cast<RecordStorageLocation>(Loc2.getSyntheticField(Name)), Env2))
return false;
} else if (Env1.getValue(*SynthFieldLoc1) !=
Env2.getValue(Loc2.getSyntheticField(Name))) {
return false;
}
}
return true;
}
} // namespace clang::dataflow
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