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//===--- DeclContextDumper.cpp --------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2025 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#include "swift/AST/ASTContext.h"
#include "swift/AST/ASTWalker.h"
#include "swift/AST/Attr.h"
#include "swift/AST/Decl.h"
#include "swift/AST/DeclContext.h"
#include "swift/AST/Expr.h"
#include "swift/AST/Pattern.h"
#include "swift/AST/SourceFile.h"
#include "swift/AST/Stmt.h"
#include "swift/AST/TypeRepr.h"
#include "swift/Subsystems.h"
#include "llvm/ADT/SetVector.h"
using namespace swift;
namespace {
/// Collect 'DeclContext' hierarchy from AST.
class DeclContextHierarchyCollector : public ASTWalker {
llvm::DenseMap<DeclContext *, llvm::SetVector<DeclContext *>> ⤅
public:
DeclContextHierarchyCollector(
llvm::DenseMap<DeclContext *, llvm::SetVector<DeclContext *>> &Map)
: Map(Map) {}
// Insert DC and its ascendants into the map.
void handle(DeclContext *DC) {
if (!DC)
return;
auto *parentDC = DC->getParent();
if (Map[parentDC].insert(DC))
handle(parentDC);
}
PreWalkAction walkToDeclPre(Decl *D) override {
handle(D->getDeclContext());
if (auto *dc = dyn_cast<DeclContext>(D)) {
handle(dc);
}
if (auto *PBD = dyn_cast<PatternBindingDecl>(D)) {
for (unsigned i = 0, e = PBD->getNumPatternEntries(); i != e; ++i)
handle(PBD->getInitContext(i));
}
for (auto *attr : D->getAttrs().getAttributes<CustomAttr>()) {
handle(attr->getInitContext());
}
return Action::Continue();
}
PreWalkResult<Expr *> walkToExprPre(Expr *E) override {
if (auto *dc = dyn_cast<AbstractClosureExpr>(E)) {
handle(dc);
}
switch (E->getKind()) {
case ExprKind::SingleValueStmt:
handle(cast<SingleValueStmtExpr>(E)->getDeclContext());
break;
case ExprKind::MacroExpansion:
handle(cast<MacroExpansionExpr>(E)->getDeclContext());
break;
default:
break;
}
return Action::Continue(E);
}
PreWalkResult<Stmt *> walkToStmtPre(Stmt *S) override {
switch (S->getKind()) {
case StmtKind::DoCatch:
handle(cast<DoCatchStmt>(S)->getDeclContext());
break;
case StmtKind::Fallthrough:
handle(cast<FallthroughStmt>(S)->getDeclContext());
break;
case StmtKind::Break:
handle(cast<BreakStmt>(S)->getDeclContext());
break;
case StmtKind::Continue:
handle(cast<ContinueStmt>(S)->getDeclContext());
break;
default:
break;
}
return Action::Continue(S);
}
PreWalkResult<Pattern *> walkToPatternPre(Pattern *P) override {
switch (P->getKind()) {
case PatternKind::EnumElement:
handle(cast<EnumElementPattern>(P)->getDeclContext());
break;
case PatternKind::Expr:
handle(cast<ExprPattern>(P)->getDeclContext());
break;
default:
break;
}
return Action::Continue(P);
}
PreWalkAction walkToTypeReprPre(TypeRepr *T) override {
switch (T->getKind()) {
case TypeReprKind::QualifiedIdent:
case TypeReprKind::UnqualifiedIdent: {
auto *tyR = cast<DeclRefTypeRepr>(T);
if (tyR->isBound())
handle(tyR->getDeclContext());
break;
}
default:
break;
}
return Action::Continue();
}
};
} // namespace
void swift::dumpDeclContextHierarchy(llvm::raw_ostream &OS,
SourceFile &SF) {
llvm::DenseMap<DeclContext *, llvm::SetVector<DeclContext *>> map;
DeclContextHierarchyCollector collector(map);
SF.walk(collector);
std::function<void(DeclContext *, size_t)> printChildrenDC =
[&](DeclContext *parentDC, size_t indent) -> void {
for (auto *DC : map[parentDC]) {
DC->printContext(OS, indent, /*onlyAPartialLine=*/true);
OS << "\n";
printChildrenDC(DC, indent + 2);
}
};
printChildrenDC(nullptr, 0);
}
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