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1 // Copyright (c) 2010, Google Inc.
2 // All rights reserved.
3 //
4 // Redistribution and use in source and binary forms, with or without
5 // modification, are permitted provided that the following conditions are
6 // met:
7 //
8 //     * Redistributions of source code must retain the above copyright
9 // notice, this list of conditions and the following disclaimer.
10 //     * Redistributions in binary form must reproduce the above
11 // copyright notice, this list of conditions and the following disclaimer
12 // in the documentation and/or other materials provided with the
13 // distribution.
14 //     * Neither the name of Google Inc. nor the names of its
15 // contributors may be used to endorse or promote products derived from
16 // this software without specific prior written permission.
17 //
18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 
30 // static_contained_range_map-inl.h: Hierarchically-organized range map,
31 // i.e., StaticContainedRangeMap implementation.
32 //
33 // See static_contained_range_map.h for documentation.
34 //
35 // Author: Siyang Xie (lambxsy@google.com)
36 
37 #ifndef PROCESSOR_STATIC_CONTAINED_RANGE_MAP_INL_H__
38 #define PROCESSOR_STATIC_CONTAINED_RANGE_MAP_INL_H__
39 
40 #include "processor/static_contained_range_map.h"
41 #include "processor/logging.h"
42 
43 namespace google_breakpad {
44 
45 template<typename AddressType, typename EntryType>
StaticContainedRangeMap(const char * base)46 StaticContainedRangeMap<AddressType, EntryType>::StaticContainedRangeMap(
47     const char *base)
48     : base_(*(reinterpret_cast<const AddressType*>(base))),
49       entry_size_(*(reinterpret_cast<const uint32_t*>(base + sizeof(base_)))),
50       entry_ptr_(reinterpret_cast<const EntryType *>(
51           base + sizeof(base_) + sizeof(entry_size_))),
52       map_(base + sizeof(base_) + sizeof(entry_size_) + entry_size_) {
53   if (entry_size_ == 0)
54     entry_ptr_ = NULL;
55 }
56 
57 
58 template<typename AddressType, typename EntryType>
RetrieveRange(const AddressType & address,const EntryType * & entry)59 bool StaticContainedRangeMap<AddressType, EntryType>::RetrieveRange(
60     const AddressType &address, const EntryType *&entry) const {
61 
62   // Get an iterator to the child range whose high address is equal to or
63   // greater than the supplied address.  If the supplied address is higher
64   // than all of the high addresses in the range, then this range does not
65   // contain a child at address, so return false.  If the supplied address
66   // is lower than the base address of the child range, then it is not within
67   // the child range, so return false.
68   MapConstIterator iterator = map_.lower_bound(address);
69 
70   if (iterator == map_.end())
71     return false;
72 
73   const char *memory_child =
74       reinterpret_cast<const char*>(iterator.GetValuePtr());
75 
76   StaticContainedRangeMap child_map(memory_child);
77 
78   if (address < child_map.base_)
79     return false;
80 
81   // The child in iterator->second contains the specified address.  Find out
82   // if it has a more-specific descendant that also contains it.  If it does,
83   // it will set |entry| appropriately.  If not, set |entry| to the child.
84   if (!child_map.RetrieveRange(address, entry))
85     entry = child_map.entry_ptr_;
86 
87   return true;
88 }
89 
90 }  // namespace google_breakpad
91 
92 #endif  // PROCESSOR_STATIC_CONTAINED_RANGE_MAP_INL_H__
93