5160ce5c72
LLDB is crashing when logging is enabled from lldb-perf-clang. This has to do with the global destructor chain as the process and its threads are being torn down. All logging channels now make one and only one instance that is kept in a global pointer which is never freed. This guarantees that logging can correctly continue as the process tears itself down. llvm-svn: 178191
154 lines
3.5 KiB
C++
154 lines
3.5 KiB
C++
//===-- AuxVector.cpp -------------------------------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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// C Includes
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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// C++ Includes
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// Other libraries and framework includes
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#include "lldb/Core/DataBufferHeap.h"
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#include "lldb/Core/DataExtractor.h"
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#include "lldb/Core/Log.h"
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#include "lldb/Target/Process.h"
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#include "AuxVector.h"
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using namespace lldb;
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using namespace lldb_private;
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static bool
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GetMaxU64(DataExtractor &data,
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lldb::offset_t *offset_ptr,
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uint64_t *value,
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unsigned int byte_size)
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{
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lldb::offset_t saved_offset = *offset_ptr;
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*value = data.GetMaxU64(offset_ptr, byte_size);
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return *offset_ptr != saved_offset;
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}
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static bool
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ParseAuxvEntry(DataExtractor &data,
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AuxVector::Entry &entry,
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lldb::offset_t *offset_ptr,
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unsigned int byte_size)
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{
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if (!GetMaxU64(data, offset_ptr, &entry.type, byte_size))
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return false;
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if (!GetMaxU64(data, offset_ptr, &entry.value, byte_size))
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return false;
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return true;
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}
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DataBufferSP
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AuxVector::GetAuxvData()
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{
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return lldb_private::Host::GetAuxvData(m_process);
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}
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void
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AuxVector::ParseAuxv(DataExtractor &data)
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{
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const unsigned int byte_size = m_process->GetAddressByteSize();
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lldb::offset_t offset = 0;
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for (;;)
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{
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Entry entry;
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if (!ParseAuxvEntry(data, entry, &offset, byte_size))
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break;
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if (entry.type == AT_NULL)
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break;
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if (entry.type == AT_IGNORE)
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continue;
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m_auxv.push_back(entry);
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}
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}
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AuxVector::AuxVector(Process *process)
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: m_process(process)
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{
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DataExtractor data;
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Log *log(GetLogIfAnyCategoriesSet(LIBLLDB_LOG_DYNAMIC_LOADER));
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data.SetData(GetAuxvData());
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data.SetByteOrder(m_process->GetByteOrder());
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data.SetAddressByteSize(m_process->GetAddressByteSize());
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ParseAuxv(data);
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if (log)
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DumpToLog(log);
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}
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AuxVector::iterator
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AuxVector::FindEntry(EntryType type) const
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{
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for (iterator I = begin(); I != end(); ++I)
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{
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if (I->type == static_cast<uint64_t>(type))
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return I;
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}
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return end();
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}
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void
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AuxVector::DumpToLog(Log *log) const
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{
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if (!log)
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return;
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log->PutCString("AuxVector: ");
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for (iterator I = begin(); I != end(); ++I)
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{
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log->Printf(" %s [%" PRIu64 "]: %" PRIx64, GetEntryName(*I), I->type, I->value);
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}
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}
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const char *
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AuxVector::GetEntryName(EntryType type)
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{
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const char *name;
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#define ENTRY_NAME(_type) _type: name = #_type
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switch (type)
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{
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case ENTRY_NAME(AT_NULL); break;
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case ENTRY_NAME(AT_IGNORE); break;
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case ENTRY_NAME(AT_EXECFD); break;
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case ENTRY_NAME(AT_PHDR); break;
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case ENTRY_NAME(AT_PHENT); break;
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case ENTRY_NAME(AT_PHNUM); break;
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case ENTRY_NAME(AT_PAGESZ); break;
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case ENTRY_NAME(AT_BASE); break;
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case ENTRY_NAME(AT_FLAGS); break;
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case ENTRY_NAME(AT_ENTRY); break;
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case ENTRY_NAME(AT_NOTELF); break;
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case ENTRY_NAME(AT_UID); break;
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case ENTRY_NAME(AT_EUID); break;
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case ENTRY_NAME(AT_GID); break;
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case ENTRY_NAME(AT_EGID); break;
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case ENTRY_NAME(AT_CLKTCK); break;
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}
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#undef ENTRY_NAME
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return name;
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}
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