1 /*
2 * Copyright 2011, 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 ELF_SECTION_HEADER_TABLE_HXX
18 #define ELF_SECTION_HEADER_TABLE_HXX
19
20 #include "ELFHeader.h"
21 #include "ELFObject.h"
22 #include "ELFSectionHeader.h"
23
24 #include "utils/rsl_assert.h"
25
26 template <unsigned Bitwidth>
~ELFSectionHeaderTable()27 ELFSectionHeaderTable<Bitwidth>::~ELFSectionHeaderTable() {
28 for (size_t i = 0; i < table.size(); ++i) {
29 delete table[i];
30 }
31 }
32
33 template <unsigned Bitwidth>
34 template <typename Archiver>
35 inline ELFSectionHeaderTable<Bitwidth> *
read(Archiver & AR,ELFObjectTy * owner)36 ELFSectionHeaderTable<Bitwidth>::read(Archiver &AR, ELFObjectTy *owner) {
37 if (!AR) {
38 // Archiver is in bad state before calling read function.
39 // Return NULL and do nothing.
40 return 0;
41 }
42
43 // Allocate a new section header table and assign the owner.
44 std::unique_ptr<ELFSectionHeaderTable> tab(new ELFSectionHeaderTable());
45
46 // Get ELF header
47 ELFHeaderTy const *header = owner->getHeader();
48
49 rsl_assert(header->getSectionHeaderEntrySize() ==
50 TypeTraits<ELFSectionHeaderTy>::size);
51
52 // Seek to the address of section header
53 AR.seek(header->getSectionHeaderTableOffset(), true);
54
55 for (size_t i = 0; i < header->getSectionHeaderNum(); ++i) {
56 std::unique_ptr<ELFSectionHeaderTy> sh(
57 ELFSectionHeaderTy::read(AR, owner, i));
58
59 if (!sh) {
60 // Something wrong while reading the section header.
61 return 0;
62 }
63
64 tab->table.push_back(sh.release());
65 }
66
67 return tab.release();
68 }
69
70 template <unsigned Bitwidth>
print() const71 inline void ELFSectionHeaderTable<Bitwidth>::print() const {
72 using namespace llvm;
73
74 out() << '\n' << fillformat('=', 79) << '\n';
75 out().changeColor(raw_ostream::WHITE, true);
76 out() << "ELF Section Header Table" << '\n';
77 out().resetColor();
78
79 for (size_t i = 0; i < table.size(); ++i) {
80 (*this)[i]->print();
81 }
82
83 out() << fillformat('=', 79) << '\n';
84 }
85
86 template <unsigned Bitwidth>
buildNameMap()87 inline void ELFSectionHeaderTable<Bitwidth>::buildNameMap() {
88 for (size_t i = 0; i < table.size(); ++i) {
89 ELFSectionHeaderTy *sh = table[i];
90 if ( sh ) {
91 name_map[sh->getName()] = sh;
92 }
93 }
94 }
95
96 template <unsigned Bitwidth>
97 inline ELFSectionHeader<Bitwidth> const *
getByName(const std::string & name) const98 ELFSectionHeaderTable<Bitwidth>::getByName(const std::string &name) const {
99 typename llvm::StringMap<ELFSectionHeaderTy *>::const_iterator sh =
100 name_map.find(name);
101 if (sh == name_map.end()) {
102 // Return SHN_UNDEF section header;
103 return table[0];
104 }
105 return sh->getValue();
106 }
107
108 template <unsigned Bitwidth>
109 inline ELFSectionHeader<Bitwidth> *
getByName(const std::string & name)110 ELFSectionHeaderTable<Bitwidth>::getByName(const std::string &name) {
111 ELFSectionHeaderTableTy const *const_this = this;
112 ELFSectionHeaderTy const *shptr = const_this->getByName(name);
113 // Const cast for the same API's const and non-const versions.
114 return const_cast<ELFSectionHeaderTy *>(shptr);
115 }
116
117 #endif // ELF_SECTION_HEADER_TABLE_HXX
118