libunwind/test/frameheadercache_test.pass.cpp

   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