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
260 lines
9.5 KiB
C++
260 lines
9.5 KiB
C++
//===-- DataBufferMemoryMap.cpp ---------------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <limits.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/mman.h>
|
|
|
|
#include "lldb/Core/DataBufferMemoryMap.h"
|
|
#include "lldb/Core/Error.h"
|
|
#include "lldb/Host/File.h"
|
|
#include "lldb/Host/FileSpec.h"
|
|
#include "lldb/Host/Host.h"
|
|
#include "lldb/Core/Log.h"
|
|
#include "lldb/lldb-private-log.h"
|
|
|
|
using namespace lldb;
|
|
using namespace lldb_private;
|
|
|
|
//----------------------------------------------------------------------
|
|
// Default Constructor
|
|
//----------------------------------------------------------------------
|
|
DataBufferMemoryMap::DataBufferMemoryMap() :
|
|
m_mmap_addr(NULL),
|
|
m_mmap_size(0),
|
|
m_data(NULL),
|
|
m_size(0)
|
|
{
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Virtual destructor since this class inherits from a pure virtual
|
|
// base class.
|
|
//----------------------------------------------------------------------
|
|
DataBufferMemoryMap::~DataBufferMemoryMap()
|
|
{
|
|
Clear();
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Return a pointer to the bytes owned by this object, or NULL if
|
|
// the object contains no bytes.
|
|
//----------------------------------------------------------------------
|
|
uint8_t *
|
|
DataBufferMemoryMap::GetBytes()
|
|
{
|
|
return m_data;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Return a const pointer to the bytes owned by this object, or NULL
|
|
// if the object contains no bytes.
|
|
//----------------------------------------------------------------------
|
|
const uint8_t *
|
|
DataBufferMemoryMap::GetBytes() const
|
|
{
|
|
return m_data;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Return the number of bytes this object currently contains.
|
|
//----------------------------------------------------------------------
|
|
uint64_t
|
|
DataBufferMemoryMap::GetByteSize() const
|
|
{
|
|
return m_size;
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Reverts this object to an empty state by unmapping any memory
|
|
// that is currently owned.
|
|
//----------------------------------------------------------------------
|
|
void
|
|
DataBufferMemoryMap::Clear()
|
|
{
|
|
if (m_mmap_addr != NULL)
|
|
{
|
|
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_MMAP));
|
|
if (log)
|
|
log->Printf("DataBufferMemoryMap::Clear() m_mmap_addr = %p, m_mmap_size = %zu", m_mmap_addr, m_mmap_size);
|
|
::munmap((void *)m_mmap_addr, m_mmap_size);
|
|
m_mmap_addr = NULL;
|
|
m_mmap_size = 0;
|
|
m_data = NULL;
|
|
m_size = 0;
|
|
}
|
|
}
|
|
|
|
//----------------------------------------------------------------------
|
|
// Memory map "length" bytes from "file" starting "offset"
|
|
// bytes into the file. If "length" is set to SIZE_MAX, then
|
|
// map as many bytes as possible.
|
|
//
|
|
// Returns the number of bytes mapped starting from the requested
|
|
// offset.
|
|
//----------------------------------------------------------------------
|
|
size_t
|
|
DataBufferMemoryMap::MemoryMapFromFileSpec (const FileSpec* filespec,
|
|
lldb::offset_t offset,
|
|
lldb::offset_t length,
|
|
bool writeable)
|
|
{
|
|
if (filespec != NULL)
|
|
{
|
|
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_MMAP));
|
|
if (log)
|
|
{
|
|
log->Printf("DataBufferMemoryMap::MemoryMapFromFileSpec(file=\"%s/%s\", offset=0x%" PRIx64 ", length=0x%" PRIx64 ", writeable=%i",
|
|
filespec->GetDirectory().GetCString(),
|
|
filespec->GetFilename().GetCString(),
|
|
offset,
|
|
length,
|
|
writeable);
|
|
}
|
|
char path[PATH_MAX];
|
|
if (filespec->GetPath(path, sizeof(path)))
|
|
{
|
|
uint32_t options = File::eOpenOptionRead;
|
|
if (writeable)
|
|
options |= File::eOpenOptionWrite;
|
|
|
|
File file;
|
|
Error error (file.Open(path, options));
|
|
if (error.Success())
|
|
{
|
|
const bool fd_is_file = true;
|
|
return MemoryMapFromFileDescriptor (file.GetDescriptor(), offset, length, writeable, fd_is_file);
|
|
}
|
|
}
|
|
}
|
|
// We should only get here if there was an error
|
|
Clear();
|
|
return 0;
|
|
}
|
|
|
|
|
|
//----------------------------------------------------------------------
|
|
// The file descriptor FD is assumed to already be opened as read only
|
|
// and the STAT structure is assumed to a valid pointer and already
|
|
// containing valid data from a call to stat().
|
|
//
|
|
// Memory map FILE_LENGTH bytes in FILE starting FILE_OFFSET bytes into
|
|
// the file. If FILE_LENGTH is set to SIZE_MAX, then map as many bytes
|
|
// as possible.
|
|
//
|
|
// RETURNS
|
|
// Number of bytes mapped starting from the requested offset.
|
|
//----------------------------------------------------------------------
|
|
size_t
|
|
DataBufferMemoryMap::MemoryMapFromFileDescriptor (int fd,
|
|
lldb::offset_t offset,
|
|
lldb::offset_t length,
|
|
bool writeable,
|
|
bool fd_is_file)
|
|
{
|
|
Clear();
|
|
if (fd >= 0)
|
|
{
|
|
Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_MMAP|LIBLLDB_LOG_VERBOSE));
|
|
if (log)
|
|
{
|
|
log->Printf("DataBufferMemoryMap::MemoryMapFromFileSpec(fd=%i, offset=0x%" PRIx64 ", length=0x%" PRIx64 ", writeable=%i, fd_is_file=%i)",
|
|
fd,
|
|
offset,
|
|
length,
|
|
writeable,
|
|
fd_is_file);
|
|
}
|
|
struct stat stat;
|
|
if (::fstat(fd, &stat) == 0)
|
|
{
|
|
if (S_ISREG(stat.st_mode) && (stat.st_size > offset))
|
|
{
|
|
const size_t max_bytes_available = stat.st_size - offset;
|
|
if (length == SIZE_MAX)
|
|
{
|
|
length = max_bytes_available;
|
|
}
|
|
else if (length > max_bytes_available)
|
|
{
|
|
// Cap the length if too much data was requested
|
|
length = max_bytes_available;
|
|
}
|
|
|
|
if (length > 0)
|
|
{
|
|
int prot = PROT_READ;
|
|
if (writeable)
|
|
prot |= PROT_WRITE;
|
|
|
|
int flags = MAP_PRIVATE;
|
|
if (fd_is_file)
|
|
flags |= MAP_FILE;
|
|
|
|
m_mmap_addr = (uint8_t *)::mmap(NULL, length, prot, flags, fd, offset);
|
|
Error error;
|
|
|
|
if (m_mmap_addr == (void*)-1)
|
|
{
|
|
error.SetErrorToErrno ();
|
|
if (error.GetError() == EINVAL)
|
|
{
|
|
// We may still have a shot at memory mapping if we align things correctly
|
|
size_t page_offset = offset % Host::GetPageSize();
|
|
if (page_offset != 0)
|
|
{
|
|
m_mmap_addr = (uint8_t *)::mmap(NULL, length + page_offset, prot, flags, fd, offset - page_offset);
|
|
if (m_mmap_addr == (void*)-1)
|
|
{
|
|
// Failed to map file
|
|
m_mmap_addr = NULL;
|
|
}
|
|
else if (m_mmap_addr != NULL)
|
|
{
|
|
// We recovered and were able to memory map
|
|
// after we aligned things to page boundaries
|
|
|
|
// Save the actual mmap'ed size
|
|
m_mmap_size = length + page_offset;
|
|
// Our data is at an offset into the the mapped data
|
|
m_data = m_mmap_addr + page_offset;
|
|
// Our pretend size is the size that was requestd
|
|
m_size = length;
|
|
}
|
|
}
|
|
}
|
|
if (error.GetError() == ENOMEM)
|
|
{
|
|
error.SetErrorStringWithFormat("could not allocate %" PRId64 " bytes of memory to mmap in file", (uint64_t) length);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// We were able to map the requested data in one chunk
|
|
// where our mmap and actual data are the same.
|
|
m_mmap_size = length;
|
|
m_data = m_mmap_addr;
|
|
m_size = length;
|
|
}
|
|
|
|
if (log)
|
|
{
|
|
log->Printf("DataBufferMemoryMap::MemoryMapFromFileSpec() m_mmap_addr = %p, m_mmap_size = %zu, error = %s",
|
|
m_mmap_addr, m_mmap_size, error.AsCString());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return GetByteSize ();
|
|
}
|