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llvm-project/lldb/source/Host/macosx/Symbols.cpp
Greg Clayton a63d08c9ff Modified the LocateMacOSXFilesUsingDebugSymbols(...) function to locate 
an executable file if it is right next to a dSYM file that is found using
DebugSymbols. The code also looks into a bundle if the dSYM file is right
next to a bundle.

Modified the MacOSX kernel dynamic loader plug-in to correctly set the load
address for kext sections. This is a tad tricky because of how LLDB chooses
to treat mach-o segments with no name. Also modified the loader to properly
handle the older version 1 kext summary info.

Fixed a crasher in the Mach-o object file parser when it is trying to set
the section size correctly for dSYM sections.

Added packet dumpers to the CommunicationKDP class. We now also properly 
detect address byte sizes based on the cpu type and subtype that is provided.
Added a read memory and read register support to CommunicationKDP. Added a
ThreadKDP class that now uses subclasses of the RegisterContextDarwin_XXX for
arm, i386 and x86_64. 

Fixed some register numbering issues in the RegisterContextDarwin_arm class
and added ARM GDB numbers to the ARM_GCC_Registers.h file.

Change the RegisterContextMach_XXX classes over to subclassing their
RegisterContextDarwin_XXX counterparts so we can share the mach register 
contexts between the user and kernel plug-ins.

llvm-svn: 135466
2011-07-19 03:57:15 +00:00

527 lines
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//===-- Symbols.cpp ---------------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "lldb/Host/Symbols.h"
// C Includes
#include <dirent.h>
#include "llvm/Support/MachO.h"
// C++ Includes
// Other libraries and framework includes
#include <CoreFoundation/CoreFoundation.h>
// Project includes
#include "lldb/Core/ArchSpec.h"
#include "lldb/Core/DataBuffer.h"
#include "lldb/Core/DataExtractor.h"
#include "lldb/Core/Timer.h"
#include "lldb/Core/UUID.h"
#include "lldb/Host/Endian.h"
#include "lldb/Utility/CleanUp.h"
#include "Host/macosx/cfcpp/CFCReleaser.h"
#include "Host/macosx/cfcpp/CFCString.h"
#include "mach/machine.h"
#include "CFCBundle.h"
using namespace lldb;
using namespace lldb_private;
using namespace llvm::MachO;
extern "C" {
CFURLRef DBGCopyFullDSYMURLForUUID (CFUUIDRef uuid, CFURLRef exec_url);
CFDictionaryRef DBGCopyDSYMPropertyLists (CFURLRef dsym_url);
}
static bool
SkinnyMachOFileContainsArchAndUUID
(
const FileSpec &file_spec,
const ArchSpec *arch,
const lldb_private::UUID *uuid, // the UUID we are looking for
off_t file_offset,
DataExtractor& data,
uint32_t data_offset,
const uint32_t magic
)
{
assert(magic == HeaderMagic32 || magic == HeaderMagic32Swapped || magic == HeaderMagic64 || magic == HeaderMagic64Swapped);
if (magic == HeaderMagic32 || magic == HeaderMagic64)
data.SetByteOrder (lldb::endian::InlHostByteOrder());
else if (lldb::endian::InlHostByteOrder() == eByteOrderBig)
data.SetByteOrder (eByteOrderLittle);
else
data.SetByteOrder (eByteOrderBig);
uint32_t i;
const uint32_t cputype = data.GetU32(&data_offset); // cpu specifier
const uint32_t cpusubtype = data.GetU32(&data_offset); // machine specifier
data_offset+=4; // Skip mach file type
const uint32_t ncmds = data.GetU32(&data_offset); // number of load commands
const uint32_t sizeofcmds = data.GetU32(&data_offset); // the size of all the load commands
data_offset+=4; // Skip flags
// Check the architecture if we have a valid arch pointer
if (arch)
{
ArchSpec file_arch(eArchTypeMachO, cputype, cpusubtype);
if (file_arch != *arch)
return false;
}
// The file exists, and if a valid arch pointer was passed in we know
// if already matches, so we can return if we aren't looking for a specific
// UUID
if (uuid == NULL)
return true;
if (magic == HeaderMagic64Swapped || magic == HeaderMagic64)
data_offset += 4; // Skip reserved field for in mach_header_64
// Make sure we have enough data for all the load commands
if (magic == HeaderMagic64Swapped || magic == HeaderMagic64)
{
if (data.GetByteSize() < sizeof(struct mach_header_64) + sizeofcmds)
{
DataBufferSP data_buffer_sp (file_spec.ReadFileContents (file_offset, sizeof(struct mach_header_64) + sizeofcmds));
data.SetData (data_buffer_sp);
}
}
else
{
if (data.GetByteSize() < sizeof(struct mach_header) + sizeofcmds)
{
DataBufferSP data_buffer_sp (file_spec.ReadFileContents (file_offset, sizeof(struct mach_header) + sizeofcmds));
data.SetData (data_buffer_sp);
}
}
for (i=0; i<ncmds; i++)
{
const uint32_t cmd_offset = data_offset; // Save this data_offset in case parsing of the segment goes awry!
uint32_t cmd = data.GetU32(&data_offset);
uint32_t cmd_size = data.GetU32(&data_offset);
if (cmd == LoadCommandUUID)
{
lldb_private::UUID file_uuid (data.GetData(&data_offset, 16), 16);
return file_uuid == *uuid;
}
data_offset = cmd_offset + cmd_size;
}
return false;
}
bool
UniversalMachOFileContainsArchAndUUID
(
const FileSpec &file_spec,
const ArchSpec *arch,
const lldb_private::UUID *uuid,
off_t file_offset,
DataExtractor& data,
uint32_t data_offset,
const uint32_t magic
)
{
assert(magic == UniversalMagic || magic == UniversalMagicSwapped);
// Universal mach-o files always have their headers encoded as BIG endian
data.SetByteOrder(eByteOrderBig);
uint32_t i;
const uint32_t nfat_arch = data.GetU32(&data_offset); // number of structs that follow
const uint32_t fat_header_and_arch_size = sizeof(struct fat_header) + nfat_arch * sizeof(struct fat_arch);
if (data.GetByteSize() < fat_header_and_arch_size)
{
DataBufferSP data_buffer_sp (file_spec.ReadFileContents (file_offset, fat_header_and_arch_size));
data.SetData (data_buffer_sp);
}
for (i=0; i<nfat_arch; i++)
{
cpu_type_t arch_cputype = data.GetU32(&data_offset); // cpu specifier (int)
cpu_subtype_t arch_cpusubtype = data.GetU32(&data_offset); // machine specifier (int)
uint32_t arch_offset = data.GetU32(&data_offset); // file offset to this object file
// uint32_t arch_size = data.GetU32(&data_offset); // size of this object file
// uint32_t arch_align = data.GetU32(&data_offset); // alignment as a power of 2
data_offset += 8; // Skip size and align as we don't need those
// Only process this slice if the cpu type/subtype matches
if (arch)
{
ArchSpec fat_arch(eArchTypeMachO, arch_cputype, arch_cpusubtype);
if (fat_arch != *arch)
continue;
}
// Create a buffer with only the arch slice date in it
DataExtractor arch_data;
DataBufferSP data_buffer_sp (file_spec.ReadFileContents (file_offset + arch_offset, 0x1000));
arch_data.SetData(data_buffer_sp);
uint32_t arch_data_offset = 0;
uint32_t arch_magic = arch_data.GetU32(&arch_data_offset);
switch (arch_magic)
{
case HeaderMagic32:
case HeaderMagic32Swapped:
case HeaderMagic64:
case HeaderMagic64Swapped:
if (SkinnyMachOFileContainsArchAndUUID (file_spec, arch, uuid, file_offset + arch_offset, arch_data, arch_data_offset, arch_magic))
return true;
break;
}
}
return false;
}
static bool
FileAtPathContainsArchAndUUID
(
const FileSpec &file_spec,
const ArchSpec *arch,
const lldb_private::UUID *uuid
)
{
DataExtractor data;
off_t file_offset = 0;
DataBufferSP data_buffer_sp (file_spec.ReadFileContents (file_offset, 0x1000));
if (data_buffer_sp && data_buffer_sp->GetByteSize() > 0)
{
data.SetData(data_buffer_sp);
uint32_t data_offset = 0;
uint32_t magic = data.GetU32(&data_offset);
switch (magic)
{
// 32 bit mach-o file
case HeaderMagic32:
case HeaderMagic32Swapped:
case HeaderMagic64:
case HeaderMagic64Swapped:
return SkinnyMachOFileContainsArchAndUUID (file_spec, arch, uuid, file_offset, data, data_offset, magic);
// fat mach-o file
case UniversalMagic:
case UniversalMagicSwapped:
return UniversalMachOFileContainsArchAndUUID (file_spec, arch, uuid, file_offset, data, data_offset, magic);
default:
break;
}
}
return false;
}
static FileSpec
LocateDSYMMachFileInDSYMBundle
(
const FileSpec& dsym_bundle_fspec,
const lldb_private::UUID *uuid,
const ArchSpec *arch)
{
char path[PATH_MAX];
FileSpec dsym_fspec;
if (dsym_bundle_fspec.GetPath(path, sizeof(path)))
{
::strncat (path, "/Contents/Resources/DWARF", sizeof(path) - strlen(path) - 1);
lldb_utility::CleanUp <DIR *, int> dirp (opendir(path), NULL, closedir);
if (dirp.is_valid())
{
dsym_fspec.GetDirectory().SetCString(path);
struct dirent* dp;
while ((dp = readdir(dirp.get())) != NULL)
{
// Only search directories
if (dp->d_type == DT_DIR || dp->d_type == DT_UNKNOWN)
{
if (dp->d_namlen == 1 && dp->d_name[0] == '.')
continue;
if (dp->d_namlen == 2 && dp->d_name[0] == '.' && dp->d_name[1] == '.')
continue;
}
if (dp->d_type == DT_REG || dp->d_type == DT_UNKNOWN)
{
dsym_fspec.GetFilename().SetCString(dp->d_name);
if (FileAtPathContainsArchAndUUID (dsym_fspec, arch, uuid))
return dsym_fspec;
}
}
}
}
dsym_fspec.Clear();
return dsym_fspec;
}
static int
LocateMacOSXFilesUsingDebugSymbols
(
const FileSpec *exec_fspec, // An executable path that may or may not be correct if UUID is specified
const ArchSpec* arch, // Limit the search to files with this architecture if non-NULL
const lldb_private::UUID *uuid, // Match the UUID value if non-NULL,
FileSpec *out_exec_fspec, // If non-NULL, try and find the executable
FileSpec *out_dsym_fspec // If non-NULL try and find the debug symbol file
)
{
int items_found = 0;
if (out_exec_fspec)
out_exec_fspec->Clear();
if (out_dsym_fspec)
out_dsym_fspec->Clear();
if (uuid && uuid->IsValid())
{
// Try and locate the dSYM file using DebugSymbols first
const UInt8 *module_uuid = (const UInt8 *)uuid->GetBytes();
if (module_uuid != NULL)
{
CFCReleaser<CFUUIDRef> module_uuid_ref(::CFUUIDCreateWithBytes (NULL,
module_uuid[0],
module_uuid[1],
module_uuid[2],
module_uuid[3],
module_uuid[4],
module_uuid[5],
module_uuid[6],
module_uuid[7],
module_uuid[8],
module_uuid[9],
module_uuid[10],
module_uuid[11],
module_uuid[12],
module_uuid[13],
module_uuid[14],
module_uuid[15]));
if (module_uuid_ref.get())
{
CFCReleaser<CFURLRef> exec_url;
if (exec_fspec)
{
char exec_cf_path[PATH_MAX];
if (exec_fspec->GetPath(exec_cf_path, sizeof(exec_cf_path)))
exec_url.reset(::CFURLCreateFromFileSystemRepresentation (NULL,
(const UInt8 *)exec_cf_path,
strlen(exec_cf_path),
FALSE));
}
CFCReleaser<CFURLRef> dsym_url (::DBGCopyFullDSYMURLForUUID(module_uuid_ref.get(), exec_url.get()));
char path[PATH_MAX];
if (dsym_url.get())
{
if (out_dsym_fspec)
{
if (::CFURLGetFileSystemRepresentation (dsym_url.get(), true, (UInt8*)path, sizeof(path)-1))
{
out_dsym_fspec->SetFile(path, false);
if (out_dsym_fspec->GetFileType () == FileSpec::eFileTypeDirectory)
{
*out_dsym_fspec = LocateDSYMMachFileInDSYMBundle (*out_dsym_fspec, uuid, arch);
if (*out_dsym_fspec)
++items_found;
}
else
{
++items_found;
}
}
}
if (out_exec_fspec)
{
CFCReleaser<CFDictionaryRef> dict(::DBGCopyDSYMPropertyLists (dsym_url.get()));;
if (dict.get())
{
char uuid_cstr_buf[64];
const char *uuid_cstr = uuid->GetAsCString (uuid_cstr_buf, sizeof(uuid_cstr_buf));
CFCString uuid_cfstr (uuid_cstr);
CFDictionaryRef uuid_dict = static_cast<CFDictionaryRef>(::CFDictionaryGetValue (dict.get(), uuid_cfstr.get()));
if (uuid_dict)
{
CFStringRef exec_cf_path = static_cast<CFStringRef>(::CFDictionaryGetValue (uuid_dict, CFSTR("DBGSymbolRichExecutable")));
if (exec_cf_path && ::CFStringGetFileSystemRepresentation (exec_cf_path, path, sizeof(path)))
{
++items_found;
out_exec_fspec->SetFile(path, path[0] == '~');
}
}
}
else
{
// No dictionary, check near the dSYM bundle for an executable that matches...
if (::CFURLGetFileSystemRepresentation (dsym_url.get(), true, (UInt8*)path, sizeof(path)-1))
{
char *dsym_extension_pos = ::strstr (path, ".dSYM");
if (dsym_extension_pos)
{
*dsym_extension_pos = '\0';
FileSpec file_spec (path, true);
switch (file_spec.GetFileType())
{
case FileSpec::eFileTypeDirectory: // Bundle directory?
{
CFCBundle bundle (path);
CFCReleaser<CFURLRef> bundle_exe_url (bundle.CopyExecutableURL ());
if (bundle_exe_url.get())
{
if (::CFURLGetFileSystemRepresentation (bundle_exe_url.get(), true, (UInt8*)path, sizeof(path)-1))
{
FileSpec bundle_exe_file_spec (path, true);
if (FileAtPathContainsArchAndUUID (bundle_exe_file_spec, arch, uuid))
{
++items_found;
*out_exec_fspec = bundle_exe_file_spec;
}
}
}
}
break;
case FileSpec::eFileTypePipe: // Forget pipes
case FileSpec::eFileTypeSocket: // We can't process socket files
case FileSpec::eFileTypeInvalid: // File doesn't exist...
break;
case FileSpec::eFileTypeUnknown:
case FileSpec::eFileTypeRegular:
case FileSpec::eFileTypeSymbolicLink:
case FileSpec::eFileTypeOther:
if (FileAtPathContainsArchAndUUID (file_spec, arch, uuid))
{
++items_found;
*out_exec_fspec = file_spec;
}
break;
}
}
}
}
}
}
}
}
}
return items_found;
}
static bool
LocateDSYMInVincinityOfExecutable (const FileSpec *exec_fspec, const ArchSpec* arch, const lldb_private::UUID *uuid, FileSpec &dsym_fspec)
{
if (exec_fspec)
{
char path[PATH_MAX];
if (exec_fspec->GetPath(path, sizeof(path)))
{
// Make sure the module isn't already just a dSYM file...
if (strcasestr(path, ".dSYM/Contents/Resources/DWARF") == NULL)
{
size_t obj_file_path_length = strlen(path);
strncat(path, ".dSYM/Contents/Resources/DWARF/", sizeof(path));
strncat(path, exec_fspec->GetFilename().AsCString(), sizeof(path));
dsym_fspec.SetFile(path, false);
if (FileAtPathContainsArchAndUUID (dsym_fspec, arch, uuid))
{
return true;
}
else
{
path[obj_file_path_length] = '\0';
char *last_dot = strrchr(path, '.');
while (last_dot != NULL && last_dot[0])
{
char *next_slash = strchr(last_dot, '/');
if (next_slash != NULL)
{
*next_slash = '\0';
strncat(path, ".dSYM/Contents/Resources/DWARF/", sizeof(path));
strncat(path, exec_fspec->GetFilename().AsCString(), sizeof(path));
dsym_fspec.SetFile(path, false);
if (dsym_fspec.Exists())
return true;
else
{
*last_dot = '\0';
char *prev_slash = strrchr(path, '/');
if (prev_slash != NULL)
*prev_slash = '\0';
else
break;
}
}
else
{
break;
}
}
}
}
}
}
dsym_fspec.Clear();
return false;
}
FileSpec
Symbols::LocateExecutableObjectFile (const FileSpec *exec_fspec, const ArchSpec* arch, const lldb_private::UUID *uuid)
{
Timer scoped_timer (__PRETTY_FUNCTION__,
"LocateExecutableObjectFile (file = %s, arch = %s, uuid = %p)",
exec_fspec ? exec_fspec->GetFilename().AsCString ("<NULL>") : "<NULL>",
arch ? arch->GetArchitectureName() : "<NULL>",
uuid);
FileSpec objfile_fspec;
if (exec_fspec && FileAtPathContainsArchAndUUID (*exec_fspec, arch, uuid))
objfile_fspec = *exec_fspec;
else
LocateMacOSXFilesUsingDebugSymbols (exec_fspec, arch, uuid, &objfile_fspec, NULL);
return objfile_fspec;
}
FileSpec
Symbols::LocateExecutableSymbolFile (const FileSpec *exec_fspec, const ArchSpec* arch, const lldb_private::UUID *uuid)
{
Timer scoped_timer (__PRETTY_FUNCTION__,
"LocateExecutableSymbolFile (file = %s, arch = %s, uuid = %p)",
exec_fspec ? exec_fspec->GetFilename().AsCString ("<NULL>") : "<NULL>",
arch ? arch->GetArchitectureName() : "<NULL>",
uuid);
FileSpec symbol_fspec;
// First try and find the dSYM in the same directory as the executable or in
// an appropriate parent directory
if (LocateDSYMInVincinityOfExecutable (exec_fspec, arch, uuid, symbol_fspec) == false)
{
// We failed to easily find the dSYM above, so use DebugSymbols
LocateMacOSXFilesUsingDebugSymbols (exec_fspec, arch, uuid, NULL, &symbol_fspec);
}
return symbol_fspec;
}
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