| 1 | //===- StmtIterator.cpp - Iterators for Statements ------------------------===// |
|---|---|
| 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 | //===----------------------------------------------------------------------===// |
| 8 | // |
| 9 | // This file defines internal methods for StmtIterator. |
| 10 | // |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #include "clang/AST/StmtIterator.h" |
| 14 | #include "clang/AST/Decl.h" |
| 15 | #include "clang/AST/Type.h" |
| 16 | #include "clang/Basic/LLVM.h" |
| 17 | #include "llvm/Support/Casting.h" |
| 18 | #include <cassert> |
| 19 | #include <cstdint> |
| 20 | |
| 21 | using namespace clang; |
| 22 | |
| 23 | // FIXME: Add support for dependent-sized array types in C++? |
| 24 | // Does it even make sense to build a CFG for an uninstantiated template? |
| 25 | static inline const VariableArrayType *FindVA(const Type* t) { |
| 26 | while (const ArrayType *vt = dyn_cast<ArrayType>(Val: t)) { |
| 27 | if (const VariableArrayType *vat = dyn_cast<VariableArrayType>(Val: vt)) |
| 28 | if (vat->getSizeExpr()) |
| 29 | return vat; |
| 30 | |
| 31 | t = vt->getElementType().getTypePtr(); |
| 32 | } |
| 33 | |
| 34 | return nullptr; |
| 35 | } |
| 36 | |
| 37 | void StmtIteratorBase::NextVA() { |
| 38 | assert(getVAPtr()); |
| 39 | |
| 40 | const VariableArrayType *p = getVAPtr(); |
| 41 | p = FindVA(p->getElementType().getTypePtr()); |
| 42 | setVAPtr(p); |
| 43 | |
| 44 | if (p) |
| 45 | return; |
| 46 | |
| 47 | if (inDeclGroup()) { |
| 48 | if (VarDecl* VD = dyn_cast<VarDecl>(Val: *DGI)) |
| 49 | if (VD->hasInit()) |
| 50 | return; |
| 51 | |
| 52 | NextDecl(); |
| 53 | } |
| 54 | else { |
| 55 | assert(inSizeOfTypeVA()); |
| 56 | RawVAPtr = 0; |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | void StmtIteratorBase::NextDecl(bool ImmediateAdvance) { |
| 61 | assert(getVAPtr() == nullptr); |
| 62 | assert(inDeclGroup()); |
| 63 | |
| 64 | if (ImmediateAdvance) |
| 65 | ++DGI; |
| 66 | |
| 67 | for ( ; DGI != DGE; ++DGI) |
| 68 | if (HandleDecl(D: *DGI)) |
| 69 | return; |
| 70 | |
| 71 | RawVAPtr = 0; |
| 72 | } |
| 73 | |
| 74 | bool StmtIteratorBase::HandleDecl(Decl* D) { |
| 75 | if (VarDecl* VD = dyn_cast<VarDecl>(Val: D)) { |
| 76 | if (const VariableArrayType* VAPtr = FindVA(VD->getType().getTypePtr())) { |
| 77 | setVAPtr(VAPtr); |
| 78 | return true; |
| 79 | } |
| 80 | |
| 81 | if (VD->getInit()) |
| 82 | return true; |
| 83 | } |
| 84 | else if (TypedefNameDecl* TD = dyn_cast<TypedefNameDecl>(Val: D)) { |
| 85 | if (const VariableArrayType* VAPtr = |
| 86 | FindVA(t: TD->getUnderlyingType().getTypePtr())) { |
| 87 | setVAPtr(VAPtr); |
| 88 | return true; |
| 89 | } |
| 90 | } |
| 91 | else if (EnumConstantDecl* ECD = dyn_cast<EnumConstantDecl>(Val: D)) { |
| 92 | if (ECD->getInitExpr()) |
| 93 | return true; |
| 94 | } |
| 95 | |
| 96 | return false; |
| 97 | } |
| 98 | |
| 99 | StmtIteratorBase::StmtIteratorBase(Decl** dgi, Decl** dge) |
| 100 | : DGI(dgi), RawVAPtr(DeclGroupMode), DGE(dge) { |
| 101 | NextDecl(ImmediateAdvance: false); |
| 102 | } |
| 103 | |
| 104 | StmtIteratorBase::StmtIteratorBase(const VariableArrayType* t) |
| 105 | : DGI(nullptr), RawVAPtr(SizeOfTypeVAMode) { |
| 106 | RawVAPtr |= reinterpret_cast<uintptr_t>(t); |
| 107 | } |
| 108 | |
| 109 | Stmt*& StmtIteratorBase::GetDeclExpr() const { |
| 110 | if (const VariableArrayType* VAPtr = getVAPtr()) { |
| 111 | assert(VAPtr->SizeExpr); |
| 112 | return const_cast<Stmt*&>(VAPtr->SizeExpr); |
| 113 | } |
| 114 | |
| 115 | assert(inDeclGroup()); |
| 116 | VarDecl* VD = cast<VarDecl>(Val: *DGI); |
| 117 | return *VD->getInitAddress(); |
| 118 | } |
| 119 |