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150
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1 //===--- Transforms.cpp - Transformations to ARC mode ---------------------===//
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2 //
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3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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4 // See https://llvm.org/LICENSE.txt for license information.
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5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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6 //
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7 //===----------------------------------------------------------------------===//
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8
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9 #include "Transforms.h"
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10 #include "Internals.h"
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11 #include "clang/ARCMigrate/ARCMT.h"
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12 #include "clang/AST/ASTContext.h"
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13 #include "clang/AST/RecursiveASTVisitor.h"
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14 #include "clang/Analysis/DomainSpecific/CocoaConventions.h"
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15 #include "clang/Basic/SourceManager.h"
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16 #include "clang/Basic/TargetInfo.h"
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17 #include "clang/Lex/Lexer.h"
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18 #include "clang/Lex/Preprocessor.h"
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19 #include "clang/Sema/Sema.h"
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20
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21 using namespace clang;
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22 using namespace arcmt;
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23 using namespace trans;
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24
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25 ASTTraverser::~ASTTraverser() { }
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26
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27 bool MigrationPass::CFBridgingFunctionsDefined() {
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236
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28 if (!EnableCFBridgeFns)
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150
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29 EnableCFBridgeFns = SemaRef.isKnownName("CFBridgingRetain") &&
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30 SemaRef.isKnownName("CFBridgingRelease");
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31 return *EnableCFBridgeFns;
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32 }
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33
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34 //===----------------------------------------------------------------------===//
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35 // Helpers.
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36 //===----------------------------------------------------------------------===//
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37
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38 bool trans::canApplyWeak(ASTContext &Ctx, QualType type,
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39 bool AllowOnUnknownClass) {
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40 if (!Ctx.getLangOpts().ObjCWeakRuntime)
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41 return false;
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42
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43 QualType T = type;
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44 if (T.isNull())
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45 return false;
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46
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47 // iOS is always safe to use 'weak'.
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48 if (Ctx.getTargetInfo().getTriple().isiOS() ||
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49 Ctx.getTargetInfo().getTriple().isWatchOS())
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50 AllowOnUnknownClass = true;
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51
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52 while (const PointerType *ptr = T->getAs<PointerType>())
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53 T = ptr->getPointeeType();
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54 if (const ObjCObjectPointerType *ObjT = T->getAs<ObjCObjectPointerType>()) {
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55 ObjCInterfaceDecl *Class = ObjT->getInterfaceDecl();
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56 if (!AllowOnUnknownClass && (!Class || Class->getName() == "NSObject"))
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57 return false; // id/NSObject is not safe for weak.
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58 if (!AllowOnUnknownClass && !Class->hasDefinition())
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59 return false; // forward classes are not verifiable, therefore not safe.
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60 if (Class && Class->isArcWeakrefUnavailable())
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61 return false;
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62 }
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63
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64 return true;
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65 }
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66
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67 bool trans::isPlusOneAssign(const BinaryOperator *E) {
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68 if (E->getOpcode() != BO_Assign)
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69 return false;
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70
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71 return isPlusOne(E->getRHS());
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72 }
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73
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74 bool trans::isPlusOne(const Expr *E) {
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75 if (!E)
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76 return false;
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77 if (const FullExpr *FE = dyn_cast<FullExpr>(E))
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78 E = FE->getSubExpr();
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79
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80 if (const ObjCMessageExpr *
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81 ME = dyn_cast<ObjCMessageExpr>(E->IgnoreParenCasts()))
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82 if (ME->getMethodFamily() == OMF_retain)
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83 return true;
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84
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85 if (const CallExpr *
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86 callE = dyn_cast<CallExpr>(E->IgnoreParenCasts())) {
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87 if (const FunctionDecl *FD = callE->getDirectCallee()) {
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88 if (FD->hasAttr<CFReturnsRetainedAttr>())
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89 return true;
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90
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91 if (FD->isGlobal() &&
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92 FD->getIdentifier() &&
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93 FD->getParent()->isTranslationUnit() &&
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94 FD->isExternallyVisible() &&
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95 ento::cocoa::isRefType(callE->getType(), "CF",
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96 FD->getIdentifier()->getName())) {
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97 StringRef fname = FD->getIdentifier()->getName();
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236
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98 if (fname.endswith("Retain") || fname.contains("Create") ||
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99 fname.contains("Copy"))
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150
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100 return true;
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101 }
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102 }
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103 }
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104
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105 const ImplicitCastExpr *implCE = dyn_cast<ImplicitCastExpr>(E);
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106 while (implCE && implCE->getCastKind() == CK_BitCast)
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107 implCE = dyn_cast<ImplicitCastExpr>(implCE->getSubExpr());
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108
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109 return implCE && implCE->getCastKind() == CK_ARCConsumeObject;
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110 }
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111
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112 /// 'Loc' is the end of a statement range. This returns the location
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113 /// immediately after the semicolon following the statement.
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114 /// If no semicolon is found or the location is inside a macro, the returned
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115 /// source location will be invalid.
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116 SourceLocation trans::findLocationAfterSemi(SourceLocation loc,
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117 ASTContext &Ctx, bool IsDecl) {
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118 SourceLocation SemiLoc = findSemiAfterLocation(loc, Ctx, IsDecl);
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119 if (SemiLoc.isInvalid())
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120 return SourceLocation();
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121 return SemiLoc.getLocWithOffset(1);
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122 }
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123
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124 /// \arg Loc is the end of a statement range. This returns the location
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125 /// of the semicolon following the statement.
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126 /// If no semicolon is found or the location is inside a macro, the returned
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127 /// source location will be invalid.
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128 SourceLocation trans::findSemiAfterLocation(SourceLocation loc,
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129 ASTContext &Ctx,
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130 bool IsDecl) {
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131 SourceManager &SM = Ctx.getSourceManager();
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132 if (loc.isMacroID()) {
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133 if (!Lexer::isAtEndOfMacroExpansion(loc, SM, Ctx.getLangOpts(), &loc))
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134 return SourceLocation();
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135 }
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136 loc = Lexer::getLocForEndOfToken(loc, /*Offset=*/0, SM, Ctx.getLangOpts());
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137
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138 // Break down the source location.
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139 std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(loc);
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140
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141 // Try to load the file buffer.
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142 bool invalidTemp = false;
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143 StringRef file = SM.getBufferData(locInfo.first, &invalidTemp);
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144 if (invalidTemp)
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145 return SourceLocation();
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146
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147 const char *tokenBegin = file.data() + locInfo.second;
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148
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149 // Lex from the start of the given location.
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150 Lexer lexer(SM.getLocForStartOfFile(locInfo.first),
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151 Ctx.getLangOpts(),
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152 file.begin(), tokenBegin, file.end());
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153 Token tok;
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154 lexer.LexFromRawLexer(tok);
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155 if (tok.isNot(tok::semi)) {
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156 if (!IsDecl)
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157 return SourceLocation();
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158 // Declaration may be followed with other tokens; such as an __attribute,
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159 // before ending with a semicolon.
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160 return findSemiAfterLocation(tok.getLocation(), Ctx, /*IsDecl*/true);
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161 }
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162
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163 return tok.getLocation();
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164 }
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165
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166 bool trans::hasSideEffects(Expr *E, ASTContext &Ctx) {
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167 if (!E || !E->HasSideEffects(Ctx))
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168 return false;
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169
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170 E = E->IgnoreParenCasts();
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171 ObjCMessageExpr *ME = dyn_cast<ObjCMessageExpr>(E);
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172 if (!ME)
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173 return true;
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174 switch (ME->getMethodFamily()) {
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175 case OMF_autorelease:
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176 case OMF_dealloc:
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177 case OMF_release:
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178 case OMF_retain:
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179 switch (ME->getReceiverKind()) {
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180 case ObjCMessageExpr::SuperInstance:
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181 return false;
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182 case ObjCMessageExpr::Instance:
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183 return hasSideEffects(ME->getInstanceReceiver(), Ctx);
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184 default:
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185 break;
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186 }
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187 break;
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188 default:
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189 break;
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190 }
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191
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192 return true;
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193 }
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194
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195 bool trans::isGlobalVar(Expr *E) {
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196 E = E->IgnoreParenCasts();
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197 if (DeclRefExpr *DRE = dyn_cast<DeclRefExpr>(E))
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198 return DRE->getDecl()->getDeclContext()->isFileContext() &&
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199 DRE->getDecl()->isExternallyVisible();
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200 if (ConditionalOperator *condOp = dyn_cast<ConditionalOperator>(E))
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201 return isGlobalVar(condOp->getTrueExpr()) &&
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202 isGlobalVar(condOp->getFalseExpr());
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203
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204 return false;
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205 }
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206
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207 StringRef trans::getNilString(MigrationPass &Pass) {
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208 return Pass.SemaRef.PP.isMacroDefined("nil") ? "nil" : "0";
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209 }
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210
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211 namespace {
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212
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213 class ReferenceClear : public RecursiveASTVisitor<ReferenceClear> {
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214 ExprSet &Refs;
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215 public:
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216 ReferenceClear(ExprSet &refs) : Refs(refs) { }
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217 bool VisitDeclRefExpr(DeclRefExpr *E) { Refs.erase(E); return true; }
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218 };
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219
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220 class ReferenceCollector : public RecursiveASTVisitor<ReferenceCollector> {
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221 ValueDecl *Dcl;
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222 ExprSet &Refs;
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223
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224 public:
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225 ReferenceCollector(ValueDecl *D, ExprSet &refs)
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226 : Dcl(D), Refs(refs) { }
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227
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228 bool VisitDeclRefExpr(DeclRefExpr *E) {
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229 if (E->getDecl() == Dcl)
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230 Refs.insert(E);
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231 return true;
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232 }
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233 };
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234
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235 class RemovablesCollector : public RecursiveASTVisitor<RemovablesCollector> {
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236 ExprSet &Removables;
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237
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238 public:
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239 RemovablesCollector(ExprSet &removables)
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240 : Removables(removables) { }
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241
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242 bool shouldWalkTypesOfTypeLocs() const { return false; }
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243
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244 bool TraverseStmtExpr(StmtExpr *E) {
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245 CompoundStmt *S = E->getSubStmt();
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246 for (CompoundStmt::body_iterator
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247 I = S->body_begin(), E = S->body_end(); I != E; ++I) {
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248 if (I != E - 1)
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249 mark(*I);
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250 TraverseStmt(*I);
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251 }
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252 return true;
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253 }
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254
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255 bool VisitCompoundStmt(CompoundStmt *S) {
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256 for (auto *I : S->body())
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257 mark(I);
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258 return true;
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259 }
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260
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261 bool VisitIfStmt(IfStmt *S) {
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262 mark(S->getThen());
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263 mark(S->getElse());
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264 return true;
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265 }
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266
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267 bool VisitWhileStmt(WhileStmt *S) {
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268 mark(S->getBody());
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269 return true;
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270 }
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271
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272 bool VisitDoStmt(DoStmt *S) {
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273 mark(S->getBody());
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274 return true;
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275 }
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276
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277 bool VisitForStmt(ForStmt *S) {
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278 mark(S->getInit());
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279 mark(S->getInc());
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280 mark(S->getBody());
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281 return true;
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282 }
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283
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284 private:
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285 void mark(Stmt *S) {
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286 if (!S) return;
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287
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288 while (auto *Label = dyn_cast<LabelStmt>(S))
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289 S = Label->getSubStmt();
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290 if (auto *E = dyn_cast<Expr>(S))
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291 S = E->IgnoreImplicit();
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292 if (auto *E = dyn_cast<Expr>(S))
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293 Removables.insert(E);
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294 }
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295 };
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296
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297 } // end anonymous namespace
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298
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299 void trans::clearRefsIn(Stmt *S, ExprSet &refs) {
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300 ReferenceClear(refs).TraverseStmt(S);
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301 }
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302
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303 void trans::collectRefs(ValueDecl *D, Stmt *S, ExprSet &refs) {
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304 ReferenceCollector(D, refs).TraverseStmt(S);
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305 }
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306
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307 void trans::collectRemovables(Stmt *S, ExprSet &exprs) {
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308 RemovablesCollector(exprs).TraverseStmt(S);
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309 }
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310
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311 //===----------------------------------------------------------------------===//
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312 // MigrationContext
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313 //===----------------------------------------------------------------------===//
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314
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315 namespace {
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316
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317 class ASTTransform : public RecursiveASTVisitor<ASTTransform> {
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318 MigrationContext &MigrateCtx;
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319 typedef RecursiveASTVisitor<ASTTransform> base;
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320
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321 public:
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322 ASTTransform(MigrationContext &MigrateCtx) : MigrateCtx(MigrateCtx) { }
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323
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324 bool shouldWalkTypesOfTypeLocs() const { return false; }
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325
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326 bool TraverseObjCImplementationDecl(ObjCImplementationDecl *D) {
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327 ObjCImplementationContext ImplCtx(MigrateCtx, D);
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328 for (MigrationContext::traverser_iterator
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329 I = MigrateCtx.traversers_begin(),
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330 E = MigrateCtx.traversers_end(); I != E; ++I)
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331 (*I)->traverseObjCImplementation(ImplCtx);
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332
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333 return base::TraverseObjCImplementationDecl(D);
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334 }
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335
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336 bool TraverseStmt(Stmt *rootS) {
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337 if (!rootS)
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338 return true;
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339
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340 BodyContext BodyCtx(MigrateCtx, rootS);
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341 for (MigrationContext::traverser_iterator
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342 I = MigrateCtx.traversers_begin(),
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343 E = MigrateCtx.traversers_end(); I != E; ++I)
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344 (*I)->traverseBody(BodyCtx);
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345
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346 return true;
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347 }
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348 };
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349
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350 }
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351
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352 MigrationContext::~MigrationContext() {
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353 for (traverser_iterator
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354 I = traversers_begin(), E = traversers_end(); I != E; ++I)
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355 delete *I;
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356 }
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357
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358 bool MigrationContext::isGCOwnedNonObjC(QualType T) {
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359 while (!T.isNull()) {
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360 if (const AttributedType *AttrT = T->getAs<AttributedType>()) {
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361 if (AttrT->getAttrKind() == attr::ObjCOwnership)
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362 return !AttrT->getModifiedType()->isObjCRetainableType();
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363 }
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364
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365 if (T->isArrayType())
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366 T = Pass.Ctx.getBaseElementType(T);
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367 else if (const PointerType *PT = T->getAs<PointerType>())
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368 T = PT->getPointeeType();
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369 else if (const ReferenceType *RT = T->getAs<ReferenceType>())
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370 T = RT->getPointeeType();
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371 else
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372 break;
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373 }
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374
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375 return false;
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376 }
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377
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378 bool MigrationContext::rewritePropertyAttribute(StringRef fromAttr,
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379 StringRef toAttr,
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380 SourceLocation atLoc) {
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381 if (atLoc.isMacroID())
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382 return false;
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383
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384 SourceManager &SM = Pass.Ctx.getSourceManager();
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385
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386 // Break down the source location.
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387 std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(atLoc);
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388
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389 // Try to load the file buffer.
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390 bool invalidTemp = false;
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391 StringRef file = SM.getBufferData(locInfo.first, &invalidTemp);
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392 if (invalidTemp)
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393 return false;
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394
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395 const char *tokenBegin = file.data() + locInfo.second;
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396
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397 // Lex from the start of the given location.
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398 Lexer lexer(SM.getLocForStartOfFile(locInfo.first),
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399 Pass.Ctx.getLangOpts(),
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400 file.begin(), tokenBegin, file.end());
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401 Token tok;
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402 lexer.LexFromRawLexer(tok);
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403 if (tok.isNot(tok::at)) return false;
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404 lexer.LexFromRawLexer(tok);
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405 if (tok.isNot(tok::raw_identifier)) return false;
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406 if (tok.getRawIdentifier() != "property")
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407 return false;
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408 lexer.LexFromRawLexer(tok);
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409 if (tok.isNot(tok::l_paren)) return false;
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410
|
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411 Token BeforeTok = tok;
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412 Token AfterTok;
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413 AfterTok.startToken();
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414 SourceLocation AttrLoc;
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415
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416 lexer.LexFromRawLexer(tok);
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417 if (tok.is(tok::r_paren))
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418 return false;
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419
|
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236
|
420 while (true) {
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150
|
421 if (tok.isNot(tok::raw_identifier)) return false;
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422 if (tok.getRawIdentifier() == fromAttr) {
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423 if (!toAttr.empty()) {
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424 Pass.TA.replaceText(tok.getLocation(), fromAttr, toAttr);
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425 return true;
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|
|
426 }
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|
|
427 // We want to remove the attribute.
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428 AttrLoc = tok.getLocation();
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|
|
429 }
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|
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430
|
|
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431 do {
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432 lexer.LexFromRawLexer(tok);
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|
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433 if (AttrLoc.isValid() && AfterTok.is(tok::unknown))
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434 AfterTok = tok;
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|
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435 } while (tok.isNot(tok::comma) && tok.isNot(tok::r_paren));
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|
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436 if (tok.is(tok::r_paren))
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|
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437 break;
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|
|
438 if (AttrLoc.isInvalid())
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|
|
439 BeforeTok = tok;
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440 lexer.LexFromRawLexer(tok);
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441 }
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442
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|
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443 if (toAttr.empty() && AttrLoc.isValid() && AfterTok.isNot(tok::unknown)) {
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|
444 // We want to remove the attribute.
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|
|
445 if (BeforeTok.is(tok::l_paren) && AfterTok.is(tok::r_paren)) {
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|
|
446 Pass.TA.remove(SourceRange(BeforeTok.getLocation(),
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|
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447 AfterTok.getLocation()));
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|
|
448 } else if (BeforeTok.is(tok::l_paren) && AfterTok.is(tok::comma)) {
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|
|
449 Pass.TA.remove(SourceRange(AttrLoc, AfterTok.getLocation()));
|
|
|
450 } else {
|
|
|
451 Pass.TA.remove(SourceRange(BeforeTok.getLocation(), AttrLoc));
|
|
|
452 }
|
|
|
453
|
|
|
454 return true;
|
|
|
455 }
|
|
|
456
|
|
|
457 return false;
|
|
|
458 }
|
|
|
459
|
|
|
460 bool MigrationContext::addPropertyAttribute(StringRef attr,
|
|
|
461 SourceLocation atLoc) {
|
|
|
462 if (atLoc.isMacroID())
|
|
|
463 return false;
|
|
|
464
|
|
|
465 SourceManager &SM = Pass.Ctx.getSourceManager();
|
|
|
466
|
|
|
467 // Break down the source location.
|
|
|
468 std::pair<FileID, unsigned> locInfo = SM.getDecomposedLoc(atLoc);
|
|
|
469
|
|
|
470 // Try to load the file buffer.
|
|
|
471 bool invalidTemp = false;
|
|
|
472 StringRef file = SM.getBufferData(locInfo.first, &invalidTemp);
|
|
|
473 if (invalidTemp)
|
|
|
474 return false;
|
|
|
475
|
|
|
476 const char *tokenBegin = file.data() + locInfo.second;
|
|
|
477
|
|
|
478 // Lex from the start of the given location.
|
|
|
479 Lexer lexer(SM.getLocForStartOfFile(locInfo.first),
|
|
|
480 Pass.Ctx.getLangOpts(),
|
|
|
481 file.begin(), tokenBegin, file.end());
|
|
|
482 Token tok;
|
|
|
483 lexer.LexFromRawLexer(tok);
|
|
|
484 if (tok.isNot(tok::at)) return false;
|
|
|
485 lexer.LexFromRawLexer(tok);
|
|
|
486 if (tok.isNot(tok::raw_identifier)) return false;
|
|
|
487 if (tok.getRawIdentifier() != "property")
|
|
|
488 return false;
|
|
|
489 lexer.LexFromRawLexer(tok);
|
|
|
490
|
|
|
491 if (tok.isNot(tok::l_paren)) {
|
|
|
492 Pass.TA.insert(tok.getLocation(), std::string("(") + attr.str() + ") ");
|
|
|
493 return true;
|
|
|
494 }
|
|
|
495
|
|
|
496 lexer.LexFromRawLexer(tok);
|
|
|
497 if (tok.is(tok::r_paren)) {
|
|
|
498 Pass.TA.insert(tok.getLocation(), attr);
|
|
|
499 return true;
|
|
|
500 }
|
|
|
501
|
|
|
502 if (tok.isNot(tok::raw_identifier)) return false;
|
|
|
503
|
|
|
504 Pass.TA.insert(tok.getLocation(), std::string(attr) + ", ");
|
|
|
505 return true;
|
|
|
506 }
|
|
|
507
|
|
|
508 void MigrationContext::traverse(TranslationUnitDecl *TU) {
|
|
|
509 for (traverser_iterator
|
|
|
510 I = traversers_begin(), E = traversers_end(); I != E; ++I)
|
|
|
511 (*I)->traverseTU(*this);
|
|
|
512
|
|
|
513 ASTTransform(*this).TraverseDecl(TU);
|
|
|
514 }
|
|
|
515
|
|
|
516 static void GCRewriteFinalize(MigrationPass &pass) {
|
|
|
517 ASTContext &Ctx = pass.Ctx;
|
|
|
518 TransformActions &TA = pass.TA;
|
|
|
519 DeclContext *DC = Ctx.getTranslationUnitDecl();
|
|
|
520 Selector FinalizeSel =
|
|
|
521 Ctx.Selectors.getNullarySelector(&pass.Ctx.Idents.get("finalize"));
|
|
|
522
|
|
|
523 typedef DeclContext::specific_decl_iterator<ObjCImplementationDecl>
|
|
|
524 impl_iterator;
|
|
|
525 for (impl_iterator I = impl_iterator(DC->decls_begin()),
|
|
|
526 E = impl_iterator(DC->decls_end()); I != E; ++I) {
|
|
|
527 for (const auto *MD : I->instance_methods()) {
|
|
|
528 if (!MD->hasBody())
|
|
|
529 continue;
|
|
|
530
|
|
|
531 if (MD->isInstanceMethod() && MD->getSelector() == FinalizeSel) {
|
|
|
532 const ObjCMethodDecl *FinalizeM = MD;
|
|
|
533 Transaction Trans(TA);
|
|
|
534 TA.insert(FinalizeM->getSourceRange().getBegin(),
|
|
|
535 "#if !__has_feature(objc_arc)\n");
|
|
|
536 CharSourceRange::getTokenRange(FinalizeM->getSourceRange());
|
|
|
537 const SourceManager &SM = pass.Ctx.getSourceManager();
|
|
|
538 const LangOptions &LangOpts = pass.Ctx.getLangOpts();
|
|
|
539 bool Invalid;
|
|
|
540 std::string str = "\n#endif\n";
|
|
|
541 str += Lexer::getSourceText(
|
|
|
542 CharSourceRange::getTokenRange(FinalizeM->getSourceRange()),
|
|
|
543 SM, LangOpts, &Invalid);
|
|
|
544 TA.insertAfterToken(FinalizeM->getSourceRange().getEnd(), str);
|
|
|
545
|
|
|
546 break;
|
|
|
547 }
|
|
|
548 }
|
|
|
549 }
|
|
|
550 }
|
|
|
551
|
|
|
552 //===----------------------------------------------------------------------===//
|
|
|
553 // getAllTransformations.
|
|
|
554 //===----------------------------------------------------------------------===//
|
|
|
555
|
|
|
556 static void traverseAST(MigrationPass &pass) {
|
|
|
557 MigrationContext MigrateCtx(pass);
|
|
|
558
|
|
|
559 if (pass.isGCMigration()) {
|
|
|
560 MigrateCtx.addTraverser(new GCCollectableCallsTraverser);
|
|
|
561 MigrateCtx.addTraverser(new GCAttrsTraverser());
|
|
|
562 }
|
|
|
563 MigrateCtx.addTraverser(new PropertyRewriteTraverser());
|
|
|
564 MigrateCtx.addTraverser(new BlockObjCVariableTraverser());
|
|
|
565 MigrateCtx.addTraverser(new ProtectedScopeTraverser());
|
|
|
566
|
|
|
567 MigrateCtx.traverse(pass.Ctx.getTranslationUnitDecl());
|
|
|
568 }
|
|
|
569
|
|
|
570 static void independentTransforms(MigrationPass &pass) {
|
|
|
571 rewriteAutoreleasePool(pass);
|
|
|
572 removeRetainReleaseDeallocFinalize(pass);
|
|
|
573 rewriteUnusedInitDelegate(pass);
|
|
|
574 removeZeroOutPropsInDeallocFinalize(pass);
|
|
|
575 makeAssignARCSafe(pass);
|
|
|
576 rewriteUnbridgedCasts(pass);
|
|
|
577 checkAPIUses(pass);
|
|
|
578 traverseAST(pass);
|
|
|
579 }
|
|
|
580
|
|
|
581 std::vector<TransformFn> arcmt::getAllTransformations(
|
|
|
582 LangOptions::GCMode OrigGCMode,
|
|
|
583 bool NoFinalizeRemoval) {
|
|
|
584 std::vector<TransformFn> transforms;
|
|
|
585
|
|
|
586 if (OrigGCMode == LangOptions::GCOnly && NoFinalizeRemoval)
|
|
|
587 transforms.push_back(GCRewriteFinalize);
|
|
|
588 transforms.push_back(independentTransforms);
|
|
|
589 // This depends on previous transformations removing various expressions.
|
|
|
590 transforms.push_back(removeEmptyStatementsAndDeallocFinalize);
|
|
|
591
|
|
|
592 return transforms;
|
|
|
593 }
|
