Mangle.cpp revision f0be979bddb8baa28e77693a3dc931e487b2a9f2 
1//===--- Mangle.cpp - Mangle C++ Names --------------------------*- C++ -*-===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// Implements generic name mangling support for blocks and Objective-C.
11//
12//===----------------------------------------------------------------------===//
13#include "clang/AST/Mangle.h"
14#include "clang/AST/ASTContext.h"
15#include "clang/AST/Decl.h"
16#include "clang/AST/DeclCXX.h"
17#include "clang/AST/DeclObjC.h"
18#include "clang/AST/DeclTemplate.h"
19#include "clang/AST/ExprCXX.h"
20#include "clang/Basic/ABI.h"
21#include "clang/Basic/SourceManager.h"
22#include "llvm/ADT/StringExtras.h"
23#include "llvm/Support/raw_ostream.h"
24#include "llvm/Support/ErrorHandling.h"
25
26#define MANGLE_CHECKER 0
27
28#if MANGLE_CHECKER
29#include <cxxabi.h>
30#endif
31
32using namespace clang;
33
34// FIXME: For blocks we currently mimic GCC's mangling scheme, which leaves
35// much to be desired. Come up with a better mangling scheme.
36
37namespace {
38
39static void mangleFunctionBlock(MangleContext &Context,
40                                llvm::StringRef Outer,
41                                const BlockDecl *BD,
42                                llvm::raw_ostream &Out) {
43  Out << "__" << Outer << "_block_invoke_" << Context.getBlockId(BD, true);
44}
45
46static void checkMangleDC(const DeclContext *DC, const BlockDecl *BD) {
47#ifndef NDEBUG
48  const DeclContext *ExpectedDC = BD->getDeclContext();
49  while (isa<BlockDecl>(ExpectedDC) || isa<EnumDecl>(ExpectedDC))
50    ExpectedDC = ExpectedDC->getParent();
51  assert(DC == ExpectedDC && "Given decl context did not match expected!");
52#endif
53}
54
55}
56
57void MangleContext::mangleGlobalBlock(const BlockDecl *BD,
58                                      llvm::raw_ostream &Out) {
59  Out << "__block_global_" << getBlockId(BD, false);
60}
61
62void MangleContext::mangleCtorBlock(const CXXConstructorDecl *CD,
63                                    CXXCtorType CT, const BlockDecl *BD,
64                                    llvm::raw_ostream &ResStream) {
65  checkMangleDC(CD, BD);
66  llvm::SmallString<64> Buffer;
67  llvm::raw_svector_ostream Out(Buffer);
68  mangleCXXCtor(CD, CT, Out);
69  Out.flush();
70  mangleFunctionBlock(*this, Buffer, BD, ResStream);
71}
72
73void MangleContext::mangleDtorBlock(const CXXDestructorDecl *DD,
74                                    CXXDtorType DT, const BlockDecl *BD,
75                                    llvm::raw_ostream &ResStream) {
76  checkMangleDC(DD, BD);
77  llvm::SmallString<64> Buffer;
78  llvm::raw_svector_ostream Out(Buffer);
79  mangleCXXDtor(DD, DT, Out);
80  Out.flush();
81  mangleFunctionBlock(*this, Buffer, BD, ResStream);
82}
83
84void MangleContext::mangleBlock(const DeclContext *DC, const BlockDecl *BD,
85                                llvm::raw_ostream &Out) {
86  assert(!isa<CXXConstructorDecl>(DC) && !isa<CXXDestructorDecl>(DC));
87  checkMangleDC(DC, BD);
88
89  llvm::SmallString<64> Buffer;
90  llvm::raw_svector_ostream Stream(Buffer);
91  if (const ObjCMethodDecl *Method = dyn_cast<ObjCMethodDecl>(DC)) {
92    mangleObjCMethodName(Method, Stream);
93  } else {
94    const NamedDecl *ND = cast<NamedDecl>(DC);
95    if (IdentifierInfo *II = ND->getIdentifier())
96      Stream << II->getName();
97    else {
98      // FIXME: We were doing a mangleUnqualifiedName() before, but that's
99      // a private member of a class that will soon itself be private to the
100      // Itanium C++ ABI object. What should we do now? Right now, I'm just
101      // calling the mangleName() method on the MangleContext; is there a
102      // better way?
103      mangleName(ND, Stream);
104    }
105  }
106  Stream.flush();
107  mangleFunctionBlock(*this, Buffer, BD, Out);
108}
109
110void MangleContext::mangleObjCMethodName(const ObjCMethodDecl *MD,
111                                         llvm::raw_ostream &Out) {
112  llvm::SmallString<64> Name;
113  llvm::raw_svector_ostream OS(Name);
114
115  const ObjCContainerDecl *CD =
116  dyn_cast<ObjCContainerDecl>(MD->getDeclContext());
117  assert (CD && "Missing container decl in GetNameForMethod");
118  OS << (MD->isInstanceMethod() ? '-' : '+') << '[' << CD->getName();
119  if (const ObjCCategoryImplDecl *CID = dyn_cast<ObjCCategoryImplDecl>(CD))
120    OS << '(' << CID << ')';
121  OS << ' ' << MD->getSelector().getAsString() << ']';
122
123  Out << OS.str().size() << OS.str();
124}
125
126void MangleContext::mangleBlock(const BlockDecl *BD,
127                                llvm::raw_ostream &Out) {
128  const DeclContext *DC = BD->getDeclContext();
129  while (isa<BlockDecl>(DC) || isa<EnumDecl>(DC))
130    DC = DC->getParent();
131  if (DC->isFunctionOrMethod())
132    mangleBlock(DC, BD, Out);
133  else
134    mangleGlobalBlock(BD, Out);
135}
136