1 //===-- ClangUtil.cpp -----------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 // A collection of helper methods and data structures for manipulating clang
8 // types and decls.
9 //===----------------------------------------------------------------------===//
10 
11 #include "Plugins/ExpressionParser/Clang/ClangUtil.h"
12 #include "Plugins/TypeSystem/Clang/TypeSystemClang.h"
13 
14 using namespace clang;
15 using namespace lldb_private;
16 
17 bool ClangUtil::IsClangType(const CompilerType &ct) {
18   // Invalid types are never Clang types.
19   if (!ct)
20     return false;
21 
22   if (!ct.GetTypeSystem().dyn_cast_or_null<TypeSystemClang>())
23     return false;
24 
25   if (!ct.GetOpaqueQualType())
26     return false;
27 
28   return true;
29 }
30 
31 clang::Decl *ClangUtil::GetDecl(const CompilerDecl &decl) {
32   assert(llvm::isa<TypeSystemClang>(decl.GetTypeSystem()));
33   return static_cast<clang::Decl *>(decl.GetOpaqueDecl());
34 }
35 
36 QualType ClangUtil::GetQualType(const CompilerType &ct) {
37   // Make sure we have a clang type before making a clang::QualType
38   if (!IsClangType(ct))
39     return QualType();
40 
41   return QualType::getFromOpaquePtr(ct.GetOpaqueQualType());
42 }
43 
44 QualType ClangUtil::GetCanonicalQualType(const CompilerType &ct) {
45   if (!IsClangType(ct))
46     return QualType();
47 
48   return GetQualType(ct).getCanonicalType();
49 }
50 
51 CompilerType ClangUtil::RemoveFastQualifiers(const CompilerType &ct) {
52   if (!IsClangType(ct))
53     return ct;
54 
55   QualType qual_type(GetQualType(ct));
56   qual_type.removeLocalFastQualifiers();
57   return CompilerType(ct.GetTypeSystem(), qual_type.getAsOpaquePtr());
58 }
59 
60 clang::TagDecl *ClangUtil::GetAsTagDecl(const CompilerType &type) {
61   clang::QualType qual_type = ClangUtil::GetCanonicalQualType(type);
62   if (qual_type.isNull())
63     return nullptr;
64 
65   return qual_type->getAsTagDecl();
66 }
67 
68 std::string ClangUtil::DumpDecl(const clang::Decl *d) {
69   if (!d)
70     return "nullptr";
71 
72   std::string result;
73   llvm::raw_string_ostream stream(result);
74   bool deserialize = false;
75   d->dump(stream, deserialize);
76 
77   stream.flush();
78   return result;
79 }
80 
81 std::string ClangUtil::ToString(const clang::Type *t) {
82   return clang::QualType(t, 0).getAsString();
83 }
84 
85 std::string ClangUtil::ToString(const CompilerType &c) {
86   return ClangUtil::GetQualType(c).getAsString();
87 }
88