tools/trace-malloc/adreader.h@97036ab72558
tools/trace-malloc/adreader.h
Tue, 06 Jan 2015 21:39:09 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Tue, 06 Jan 2015 21:39:09 +0100
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
- permissions
- -rw-r--r--
Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.
1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5 #include <stdlib.h>
7 #define ADLOG_ENTRY_BLOCK_SIZE 4096
9 class ADLog {
11 public:
13 // Use typedef in case somebody wants to process 64-bit output on a
14 // 32-bit machine someday.
15 typedef const char* Pointer;
17 struct Entry {
18 Pointer address;
19 const char *type;
21 const char *data; // The contents of the memory.
22 size_t datasize;
24 const char *allocation_stack;
25 };
27 ADLog();
28 ~ADLog();
30 /*
31 * Returns false on failure and true on success.
32 */
33 bool Read(const char *aFilename);
35 private:
36 // Link structure for a circularly linked list.
37 struct EntryBlock;
38 struct EntryBlockLink {
39 EntryBlock *mPrev;
40 EntryBlock *mNext;
41 };
43 struct EntryBlock : public EntryBlockLink {
44 Entry entries[ADLOG_ENTRY_BLOCK_SIZE];
45 };
47 size_t mEntryCount;
48 EntryBlockLink mEntries;
50 public:
52 class const_iterator {
53 private:
54 // Only |ADLog| member functions can construct iterators.
55 friend class ADLog;
56 const_iterator(EntryBlock *aBlock, size_t aOffset);
58 public:
59 const Entry* operator*() { return mCur; }
60 const Entry* operator->() { return mCur; }
62 const_iterator& operator++();
63 const_iterator& operator--();
65 bool operator==(const const_iterator& aOther) const {
66 return mCur == aOther.mCur;
67 }
69 bool operator!=(const const_iterator& aOther) const {
70 return mCur != aOther.mCur;
71 }
73 private:
74 void SetBlock(EntryBlock *aBlock) {
75 mBlock = aBlock;
76 mBlockStart = aBlock->entries;
77 mBlockEnd = aBlock->entries + ADLOG_ENTRY_BLOCK_SIZE;
78 }
80 EntryBlock *mBlock;
81 Entry *mCur, *mBlockStart, *mBlockEnd;
83 // Not to be implemented.
84 const_iterator operator++(int);
85 const_iterator operator--(int);
86 };
88 const_iterator begin() {
89 return const_iterator(mEntries.mNext, 0);
90 }
91 const_iterator end() {
92 return const_iterator(mEntries.mPrev,
93 mEntryCount % ADLOG_ENTRY_BLOCK_SIZE);
94 }
96 size_t count() { return mEntryCount; }
97 };
