Stephen Hines | 11274a7 | 2012-09-26 19:14:20 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2012, The Android Open Source Project |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | #include "slang_rs_check_ast.h" |
| 18 | |
| 19 | #include "slang_assert.h" |
| 20 | #include "slang_rs.h" |
| 21 | #include "slang_rs_export_type.h" |
| 22 | |
| 23 | namespace slang { |
| 24 | |
| 25 | void RSCheckAST::VisitStmt(clang::Stmt *S) { |
| 26 | // This function does the actual iteration through all sub-Stmt's within |
| 27 | // a given Stmt. Note that this function is skipped by all of the other |
| 28 | // Visit* functions if we have already found a higher-level match. |
| 29 | for (clang::Stmt::child_iterator I = S->child_begin(), E = S->child_end(); |
| 30 | I != E; |
| 31 | I++) { |
| 32 | if (clang::Stmt *Child = *I) { |
| 33 | Visit(Child); |
| 34 | } |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | void RSCheckAST::ValidateFunctionDecl(clang::FunctionDecl *FD) { |
| 39 | if (!FD) { |
| 40 | return; |
| 41 | } |
| 42 | |
| 43 | if (!mIsFilterscript) { |
| 44 | // No additional validation for non-Filterscript functions. |
| 45 | if (clang::Stmt *Body = FD->getBody()) { |
| 46 | Visit(Body); |
| 47 | } |
| 48 | return; |
| 49 | } |
| 50 | |
| 51 | size_t numParams = FD->getNumParams(); |
| 52 | |
| 53 | clang::QualType resultType = FD->getResultType().getCanonicalType(); |
| 54 | |
| 55 | // We use FD as our NamedDecl in the case of a bad return type. |
| 56 | if (!RSExportType::ValidateType(C, resultType, FD, |
| 57 | FD->getLocStart(), mTargetAPI, |
| 58 | mIsFilterscript)) { |
| 59 | mValid = false; |
| 60 | } |
| 61 | |
| 62 | for (size_t i = 0; i < numParams; i++) { |
| 63 | clang::ParmVarDecl *PVD = FD->getParamDecl(i); |
| 64 | clang::QualType QT = PVD->getType().getCanonicalType(); |
| 65 | if (!RSExportType::ValidateType(C, QT, PVD, PVD->getLocStart(), |
| 66 | mTargetAPI, mIsFilterscript)) { |
| 67 | mValid = false; |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | if (clang::Stmt *Body = FD->getBody()) { |
| 72 | Visit(Body); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | |
| 77 | void RSCheckAST::ValidateVarDecl(clang::VarDecl *VD) { |
| 78 | if (!VD) { |
| 79 | return; |
| 80 | } |
| 81 | |
| 82 | const clang::Type *T = VD->getType().getTypePtr(); |
| 83 | |
| 84 | if (VD->getLinkage() == clang::ExternalLinkage) { |
| 85 | llvm::StringRef TypeName; |
| 86 | if (!RSExportType::NormalizeType(T, TypeName, &mDiagEngine, VD)) { |
| 87 | mValid = false; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | if (!RSExportType::ValidateVarDecl(VD, mTargetAPI, mIsFilterscript)) { |
| 92 | mValid = false; |
| 93 | } else if (clang::Expr *Init = VD->getInit()) { |
| 94 | // Only check the initializer if the decl is already ok. |
| 95 | Visit(Init); |
| 96 | } |
| 97 | } |
| 98 | |
| 99 | |
| 100 | void RSCheckAST::VisitDeclStmt(clang::DeclStmt *DS) { |
| 101 | if (!SlangRS::IsLocInRSHeaderFile(DS->getLocStart(), mSM)) { |
| 102 | for (clang::DeclStmt::decl_iterator I = DS->decl_begin(), |
| 103 | E = DS->decl_end(); |
| 104 | I != E; |
| 105 | ++I) { |
| 106 | if (clang::VarDecl *VD = llvm::dyn_cast<clang::VarDecl>(*I)) { |
| 107 | ValidateVarDecl(VD); |
| 108 | } else if (clang::FunctionDecl *FD = |
| 109 | llvm::dyn_cast<clang::FunctionDecl>(*I)) { |
| 110 | ValidateFunctionDecl(FD); |
| 111 | } |
| 112 | } |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | |
| 117 | void RSCheckAST::VisitExpr(clang::Expr *E) { |
| 118 | // This is where FS checks for code using pointer and/or 64-bit expressions |
| 119 | // (i.e. things like casts). |
| 120 | |
| 121 | // First we skip implicit casts (things like function calls and explicit |
| 122 | // array accesses rely heavily on them and they are valid. |
| 123 | E = E->IgnoreImpCasts(); |
| 124 | if (mIsFilterscript && |
| 125 | !SlangRS::IsLocInRSHeaderFile(E->getExprLoc(), mSM) && |
| 126 | !RSExportType::ValidateType(C, E->getType(), NULL, E->getExprLoc(), |
| 127 | mTargetAPI, mIsFilterscript)) { |
| 128 | mValid = false; |
| 129 | } else { |
| 130 | // Only visit sub-expressions if we haven't already seen a violation. |
| 131 | VisitStmt(E); |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | |
| 136 | bool RSCheckAST::Validate() { |
| 137 | clang::TranslationUnitDecl *TUDecl = C.getTranslationUnitDecl(); |
| 138 | for (clang::DeclContext::decl_iterator DI = TUDecl->decls_begin(), |
| 139 | DE = TUDecl->decls_end(); |
| 140 | DI != DE; |
| 141 | DI++) { |
| 142 | if (!SlangRS::IsLocInRSHeaderFile(DI->getLocStart(), mSM)) { |
| 143 | if (clang::VarDecl *VD = llvm::dyn_cast<clang::VarDecl>(*DI)) { |
| 144 | ValidateVarDecl(VD); |
| 145 | } else if (clang::FunctionDecl *FD = |
| 146 | llvm::dyn_cast<clang::FunctionDecl>(*DI)) { |
| 147 | ValidateFunctionDecl(FD); |
| 148 | } else if (clang::Stmt *Body = (*DI)->getBody()) { |
| 149 | Visit(Body); |
| 150 | } |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | return mValid; |
| 155 | } |
| 156 | |
| 157 | } // namespace slang |