slang_rs_object_ref_count.h revision c202d2d64fe0172bcc3999b515a14d3d88532420
1/* 2 * Copyright 2010, 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#ifndef _FRAMEWORKS_COMPILE_SLANG_SLANG_RS_OBJECT_REF_COUNT_H_ // NOLINT 18#define _FRAMEWORKS_COMPILE_SLANG_SLANG_RS_OBJECT_REF_COUNT_H_ 19 20#include <list> 21#include <stack> 22 23#include "clang/AST/StmtVisitor.h" 24 25#include "slang_rs_export_type.h" 26 27namespace clang { 28 class Expr; 29 class Stmt; 30} 31 32namespace slang { 33 34class RSObjectRefCount : public clang::StmtVisitor<RSObjectRefCount> { 35 private: 36 class Scope { 37 private: 38 clang::CompoundStmt *mCS; // Associated compound statement ({ ... }) 39 std::list<clang::VarDecl*> mRSO; // Declared RS objects in this scope 40 41 // RSSetObjectFD and RSClearObjectFD holds FunctionDecl of rsSetObject() 42 // and rsClearObject() in the current ASTContext. 43 static clang::FunctionDecl *RSSetObjectFD[]; 44 static clang::FunctionDecl *RSClearObjectFD[]; 45 46 public: 47 explicit Scope(clang::CompoundStmt *CS) : mCS(CS) { 48 return; 49 } 50 51 inline void addRSObject(clang::VarDecl* VD) { 52 mRSO.push_back(VD); 53 return; 54 } 55 56 // Initialize RSSetObjectFD and RSClearObjectFD. 57 static void GetRSRefCountingFunctions(clang::ASTContext &C); 58 59 void ReplaceRSObjectAssignment(clang::BinaryOperator *AS); 60 61 void InsertLocalVarDestructors(); 62 63 static clang::Stmt *ClearRSObject(clang::VarDecl *VD); 64 }; 65 66 std::stack<Scope*> mScopeStack; 67 bool RSInitFD; 68 69 inline Scope *getCurrentScope() { 70 return mScopeStack.top(); 71 } 72 73 // TODO(srhines): Composite types and arrays based on RS object types need 74 // to be handled for both zero-initialization + clearing. 75 76 // Return false if the type of variable declared in VD is not an RS object 77 // type. 78 static bool InitializeRSObject(clang::VarDecl *VD); 79 80 // Return a zero-initializer expr of the type DT. This processes both 81 // RS matrix type and RS object type. 82 static clang::Expr *CreateZeroInitializerForRSSpecificType( 83 RSExportPrimitiveType::DataType DT, 84 clang::ASTContext &C, 85 const clang::SourceLocation &Loc); 86 87 public: 88 RSObjectRefCount() 89 : RSInitFD(false) { 90 return; 91 } 92 93 void Init(clang::ASTContext &C) { 94 if (!RSInitFD) { 95 Scope::GetRSRefCountingFunctions(C); 96 RSInitFD = true; 97 } 98 return; 99 } 100 101 void VisitStmt(clang::Stmt *S); 102 void VisitDeclStmt(clang::DeclStmt *DS); 103 void VisitCompoundStmt(clang::CompoundStmt *CS); 104 void VisitBinAssign(clang::BinaryOperator *AS); 105 106 // We believe that RS objects are never involved in CompoundAssignOperator. 107 // I.e., rs_allocation foo; foo += bar; 108}; 109 110} // namespace slang 111 112#endif // _FRAMEWORKS_COMPILE_SLANG_SLANG_RS_OBJECT_REF_COUNT_H_ NOLINT 113