97 lines
3.3 KiB
C++
97 lines
3.3 KiB
C++
//===--- ExpectedTypes.cpp ---------------------------------------*- C++-*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "ExpectedTypes.h"
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#include "clang/AST/ASTContext.h"
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#include "clang/AST/DeclTemplate.h"
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#include "clang/AST/Type.h"
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#include "clang/Index/USRGeneration.h"
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#include "clang/Sema/CodeCompleteConsumer.h"
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#include "llvm/ADT/None.h"
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#include "llvm/ADT/STLExtras.h"
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namespace clang {
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namespace clangd {
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namespace {
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static const Type *toEquivClass(ASTContext &Ctx, QualType T) {
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if (T.isNull() || T->isDependentType())
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return nullptr;
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// Drop references, we do not handle reference inits properly anyway.
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T = T.getCanonicalType().getNonReferenceType();
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// Numeric types are the simplest case.
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if (T->isBooleanType())
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return Ctx.BoolTy.getTypePtr();
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if (T->isIntegerType() && !T->isEnumeralType())
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return Ctx.IntTy.getTypePtr(); // All integers are equivalent.
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if (T->isFloatingType() && !T->isComplexType())
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return Ctx.FloatTy.getTypePtr(); // All floats are equivalent.
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// Do some simple transformations.
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if (T->isArrayType()) // Decay arrays to pointers.
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return Ctx.getPointerType(QualType(T->getArrayElementTypeNoTypeQual(), 0))
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.getTypePtr();
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// Drop the qualifiers and return the resulting type.
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// FIXME: also drop qualifiers from pointer types, e.g. 'const T* => T*'
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return T.getTypePtr();
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}
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static llvm::Optional<QualType>
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typeOfCompletion(const CodeCompletionResult &R) {
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const NamedDecl *D = R.Declaration;
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// Templates do not have a type on their own, look at the templated decl.
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if (auto *Template = dyn_cast_or_null<TemplateDecl>(D))
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D = Template->getTemplatedDecl();
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auto *VD = dyn_cast_or_null<ValueDecl>(D);
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if (!VD)
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return llvm::None; // We handle only variables and functions below.
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auto T = VD->getType();
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if (T.isNull())
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return llvm::None;
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if (auto FuncT = T->getAs<FunctionType>()) {
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// Functions are a special case. They are completed as 'foo()' and we want
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// to match their return type rather than the function type itself.
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// FIXME(ibiryukov): in some cases, we might want to avoid completing `()`
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// after the function name, e.g. `std::cout << std::endl`.
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return FuncT->getReturnType();
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}
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return T;
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}
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} // namespace
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llvm::Optional<OpaqueType> OpaqueType::encode(ASTContext &Ctx, QualType T) {
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if (T.isNull())
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return None;
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const Type *C = toEquivClass(Ctx, T);
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if (!C)
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return None;
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llvm::SmallString<128> Encoded;
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if (index::generateUSRForType(QualType(C, 0), Ctx, Encoded))
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return None;
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return OpaqueType(std::string(Encoded.str()));
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}
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OpaqueType::OpaqueType(std::string Data) : Data(std::move(Data)) {}
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llvm::Optional<OpaqueType> OpaqueType::fromType(ASTContext &Ctx,
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QualType Type) {
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return encode(Ctx, Type);
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}
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llvm::Optional<OpaqueType>
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OpaqueType::fromCompletionResult(ASTContext &Ctx,
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const CodeCompletionResult &R) {
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auto T = typeOfCompletion(R);
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if (!T)
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return None;
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return encode(Ctx, *T);
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}
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} // namespace clangd
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} // namespace clang
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