lldb/test/API/functionalities/postmortem/FreeBSDKernel/tools/lldb-minimize-processes.patch

   1 diff --git a/lldb/source/Plugins/Process/FreeBSDKernel/ProcessFreeBSDKernel.cpp b/lldb/source/Plugins/Process/FreeBSDKernel/ProcessFreeBSDKernel.cpp
   2 index e3707365a9c3..c4a9c82f3c63 100644
   3 --- a/lldb/source/Plugins/Process/FreeBSDKernel/ProcessFreeBSDKernel.cpp
   4 +++ b/lldb/source/Plugins/Process/FreeBSDKernel/ProcessFreeBSDKernel.cpp
   5 @@ -38,6 +38,8 @@ public:
   6
   7    size_t DoReadMemory(lldb::addr_t addr, void *buf, size_t size,
   8                        lldb_private::Status &error) override;
   9 +  size_t DoWriteMemory(lldb::addr_t vm_addr, const void *buf,
  10 +                       size_t size, Status &error) override;
  11
  12  private:
  13    fvc_t *m_fvc;
  14 @@ -185,6 +187,7 @@ bool ProcessFreeBSDKernel::DoUpdateThreadList(ThreadList &old_thread_list,
  15      // iterate through a linked list of all processes
  16      // allproc is a pointer to the first list element, p_list field
  17      // (found at offset_p_list) specifies the next element
  18 +    lldb::addr_t prev = 0;
  19      for (lldb::addr_t proc =
  20               ReadPointerFromMemory(FindSymbol("allproc"), error);
  21           proc != 0 && proc != LLDB_INVALID_ADDRESS;
  22 @@ -195,6 +198,8 @@ bool ProcessFreeBSDKernel::DoUpdateThreadList(ThreadList &old_thread_list,
  23        char comm[fbsd_maxcomlen + 1];
  24        ReadCStringFromMemory(proc + offset_p_comm, comm, sizeof(comm), error);
  25
  26 +      bool interesting = false;
  27 +
  28        // iterate through a linked list of all process' threads
  29        // the initial thread is found in process' p_threads, subsequent
  30        // elements are linked via td_plist field
  31 @@ -231,6 +236,7 @@ bool ProcessFreeBSDKernel::DoUpdateThreadList(ThreadList &old_thread_list,
  32            // NB: dumppcb can be LLDB_INVALID_ADDRESS if reading it failed
  33            pcb_addr = dumppcb;
  34            thread_desc += " (crashed)";
  35 +          interesting = true;
  36          } else if (oncpu != -1) {
  37            // if we managed to read stoppcbs and pcb_size, use them to find
  38            // the correct PCB
  39 @@ -239,13 +245,27 @@ bool ProcessFreeBSDKernel::DoUpdateThreadList(ThreadList &old_thread_list,
  40            else
  41              pcb_addr = LLDB_INVALID_ADDRESS;
  42            thread_desc += llvm::formatv(" (on CPU {0})", oncpu);
  43 +          interesting = true;
  44          }
  45
  46          ThreadSP thread_sp{
  47              new ThreadFreeBSDKernel(*this, tid, pcb_addr, thread_desc)};
  48          new_thread_list.AddThread(thread_sp);
  49        }
  50 +
  51 +      if (interesting) {
  52 +        printf("pid %d is interesting\n", pid);
  53 +        if (prev != 0) {
  54 +          printf("will link %d to %d\n", prev, proc);
  55 +          if (!WritePointerToMemory(prev + offset_p_list, proc, error))
  56 +            assert(0 && "write failed");
  57 +        }
  58 +        prev = proc;
  59 +      }
  60      }
  61 +    printf("last: %d\n", prev);
  62 +    if (!WritePointerToMemory(prev + offset_p_list, 0, error))
  63 +      assert(0 && "write failed");
  64    } else {
  65      const uint32_t num_threads = old_thread_list.GetSize(false);
  66      for (uint32_t i = 0; i < num_threads; ++i)
  67 @@ -295,6 +315,18 @@ size_t ProcessFreeBSDKernelFVC::DoReadMemory(lldb::addr_t addr, void *buf,
  68    return rd;
  69  }
  70
  71 +size_t ProcessFreeBSDKernelFVC::DoWriteMemory(lldb::addr_t vm_addr, const void *buf,
  72 +                       size_t size, Status &error) {
  73 +  ssize_t rd = 0;
  74 +  rd = fvc_write(m_fvc, vm_addr, buf, size);
  75 +  printf("fvc_write(%p, %p, %d) -> %d\n", vm_addr, buf, size, rd);
  76 +  if (rd < 0 || static_cast<size_t>(rd) != size) {
  77 +    error.SetErrorStringWithFormat("Writing memory failed: %s", GetError());
  78 +    return rd > 0 ? rd : 0;
  79 +  }
  80 +  return rd;
  81 +}
  82 +
  83  const char *ProcessFreeBSDKernelFVC::GetError() { return fvc_geterr(m_fvc); }
  84
  85  #endif // LLDB_ENABLE_FBSDVMCORE