1 // -*- C++ -*-
2 //===----------------------------------------------------------------------===//
3 //
4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5 // See https://llvm.org/LICENSE.txt for license information.
6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // The other libunwind tests don't test internal interfaces, so the include path
11 // is a little wonky.
12 #include "../src/config.h"
13 
14 // Only run this test under supported configurations.
15 
16 #if defined(_LIBUNWIND_USE_DL_ITERATE_PHDR) &&                                 \
17     defined(_LIBUNWIND_USE_FRAME_HEADER_CACHE)
18 
19 #include <link.h>
20 #include <stdio.h>
21 
22 // This file defines several of the data structures needed here,
23 // and includes FrameHeaderCache.hpp as well.
24 #include "../src/AddressSpace.hpp"
25 
26 #define kBaseAddr 0xFFF000
27 #define kTextSegmentLength 0xFF
28 
29 using namespace libunwind;
30 
31 int main(int, char**) {
32   FrameHeaderCache FHC;
33   struct dl_phdr_info PInfo;
34   memset(&PInfo, 0, sizeof(PInfo));
35   // The cache itself should only care about these two fields--they
36   // tell the cache to invalidate or not; everything else is handled
37   // by AddressSpace.hpp.
38   PInfo.dlpi_adds = 6;
39   PInfo.dlpi_subs = 7;
40 
41   UnwindInfoSections UIS;
42   UIS.dso_base = kBaseAddr;
43   UIS.text_segment_length = kTextSegmentLength;
44   dl_iterate_cb_data CBData;
45   // Unused by the cache.
46   CBData.addressSpace = nullptr;
47   CBData.sects = &UIS;
48   CBData.targetAddr = kBaseAddr + 1;
49 
50   // Nothing present, shouldn't find.
51   if (FHC.find(&PInfo, 0, &CBData))
52     abort();
53   FHC.add(&UIS);
54   // Just added. Should find.
55   if (!FHC.find(&PInfo, 0, &CBData))
56     abort();
57   // Cache is invalid. Shouldn't find.
58   PInfo.dlpi_adds++;
59   if (FHC.find(&PInfo, 0, &CBData))
60     abort();
61 
62   FHC.add(&UIS);
63   CBData.targetAddr = kBaseAddr - 1;
64   // Shouldn't find something outside of the addresses.
65   if (FHC.find(&PInfo, 0, &CBData))
66     abort();
67   // Add enough things to the cache that the entry is evicted.
68   for (int i = 0; i < 9; i++) {
69     UIS.dso_base = kBaseAddr + (kTextSegmentLength * i);
70     FHC.add(&UIS);
71   }
72   CBData.targetAddr = kBaseAddr;
73   // Should have been evicted.
74   if (FHC.find(&PInfo, 0, &CBData))
75     abort();
76   return 0;
77 }
78 
79 #else
80 int main(int, char**) { return 0;}
81 #endif
82