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//===--- ExprContextAnalysis.cpp - Expession context analysis -------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2018 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 "ExprContextAnalysis.h"
#include "swift/AST/ASTContext.h"
#include "swift/AST/ASTVisitor.h"
#include "swift/AST/ASTWalker.h"
#include "swift/AST/Decl.h"
#include "swift/AST/DeclContext.h"
#include "swift/AST/Expr.h"
#include "swift/AST/GenericSignature.h"
#include "swift/AST/Initializer.h"
#include "swift/AST/LazyResolver.h"
#include "swift/AST/Module.h"
#include "swift/AST/NameLookup.h"
#include "swift/AST/ParameterList.h"
#include "swift/AST/Pattern.h"
#include "swift/AST/SourceFile.h"
#include "swift/AST/Stmt.h"
#include "swift/AST/Type.h"
#include "swift/AST/Types.h"
#include "swift/Basic/SourceManager.h"
#include "swift/IDE/CodeCompletionResult.h"
#include "swift/Sema/IDETypeChecking.h"
#include "swift/Subsystems.h"
#include "clang/AST/Attr.h"
#include "clang/AST/Decl.h"
#include "llvm/ADT/SmallSet.h"
using namespace swift;
using namespace ide;
//===----------------------------------------------------------------------===//
// typeCheckContextAt(DeclContext, SourceLoc)
//===----------------------------------------------------------------------===//
void swift::ide::typeCheckContextAt(TypeCheckASTNodeAtLocContext TypeCheckCtx,
SourceLoc Loc) {
// Make sure the extension has been bound.
auto DC = TypeCheckCtx.getDeclContext();
// Even if the extension is invalid (e.g. nested in a function or another
// type), we want to know the "intended nominal" of the extension so that
// we can know the type of 'Self'.
SmallVector<ExtensionDecl *, 1> extensions;
for (auto typeCtx = DC->getInnermostTypeContext(); typeCtx != nullptr;
typeCtx = typeCtx->getParent()->getInnermostTypeContext()) {
if (auto *ext = dyn_cast<ExtensionDecl>(typeCtx))
extensions.push_back(ext);
}
while (!extensions.empty()) {
extensions.back()->computeExtendedNominal();
extensions.pop_back();
}
// If the completion happens in the inheritance clause of the extension,
// 'DC' is the parent of the extension. We need to iterate the top level
// decls to find it. In theory, we don't need the extended nominal in the
// inheritance clause, but ASTScope lookup requires that. We don't care
// unless 'DC' is not 'SourceFile' because non-toplevel extensions are
// 'canNeverBeBound()' anyway.
if (auto *SF = dyn_cast<SourceFile>(DC)) {
auto &SM = DC->getASTContext().SourceMgr;
for (auto *decl : SF->getTopLevelDecls())
if (auto *ext = dyn_cast<ExtensionDecl>(decl))
if (SM.rangeContainsTokenLoc(ext->getSourceRange(), Loc))
ext->computeExtendedNominal();
}
swift::typeCheckASTNodeAtLoc(TypeCheckCtx, Loc);
}
//===----------------------------------------------------------------------===//
// findParsedExpr(DeclContext, Expr)
//===----------------------------------------------------------------------===//
namespace {
class ExprFinder : public ASTWalker {
SourceManager &SM;
SourceRange TargetRange;
Expr *FoundExpr = nullptr;
template <typename NodeType> bool isInterstingRange(NodeType *Node) {
return SM.rangeContains(Node->getSourceRange(), TargetRange);
}
bool shouldIgnore(Expr *E) {
// E.g. instanceOfDerived.methodInBaseReturningSelf().#^HERE^#'
// When calling a method in a base class returning 'Self', the call
// expression itself has the type of the base class. That is wrapped with
// CovariantReturnConversionExpr which downcasts it to the derived class.
if (isa<CovariantReturnConversionExpr>(E))
return false;
// E.g. TypeName(#^HERE^#
// In this case, we want the type expression instead of a reference to the
// initializer.
if (isa<ConstructorRefCallExpr>(E))
return true;
// Ignore other implicit expression.
if (E->isImplicit())
return true;
return false;
}
public:
ExprFinder(SourceManager &SM, SourceRange TargetRange)
: SM(SM), TargetRange(TargetRange) {}
Expr *get() const { return FoundExpr; }
MacroWalking getMacroWalkingBehavior() const override {
return MacroWalking::ArgumentsAndExpansion;
}
PreWalkResult<Expr *> walkToExprPre(Expr *E) override {
if (TargetRange == E->getSourceRange() && !shouldIgnore(E)) {
assert(!FoundExpr && "non-nullptr for found expr");
FoundExpr = E;
return Action::Stop();
}
return Action::VisitNodeIf(isInterstingRange(E), E);
}
PreWalkResult<Pattern *> walkToPatternPre(Pattern *P) override {
return Action::VisitNodeIf(isInterstingRange(P), P);
}
PreWalkResult<Stmt *> walkToStmtPre(Stmt *S) override {
return Action::VisitNodeIf(isInterstingRange(S), S);
}
PreWalkAction walkToTypeReprPre(TypeRepr *T) override {
return Action::SkipNode();
}
};
} // anonymous namespace
Expr *swift::ide::findParsedExpr(const DeclContext *DC,
SourceRange TargetRange) {
ExprFinder finder(DC->getASTContext().SourceMgr, TargetRange);
const_cast<DeclContext *>(DC)->walkContext(finder);
return finder.get();
}
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