llvm-6502/lib/Archive/Archive.cpp
Chris Lattner 252ad03d7d Change Path::getStatusInfo to return a boolean and error string on an error
instead of throwing an exception.  This reduces the amount of code that is
exposed to exceptions (e.g. FileUtilities), though it is clearly only one step
along the way.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29395 91177308-0d34-0410-b5e6-96231b3b80d8
2006-07-28 22:03:44 +00:00

180 lines
5.3 KiB
C++

//===-- Archive.cpp - Generic LLVM archive functions ------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the implementation of the Archive and ArchiveMember
// classes that is common to both reading and writing archives..
//
//===----------------------------------------------------------------------===//
#include "ArchiveInternals.h"
#include "llvm/ModuleProvider.h"
#include "llvm/System/Process.h"
using namespace llvm;
// getMemberSize - compute the actual physical size of the file member as seen
// on disk. This isn't the size of member's payload. Use getSize() for that.
unsigned
ArchiveMember::getMemberSize() const {
// Basically its the file size plus the header size
unsigned result = info.fileSize + sizeof(ArchiveMemberHeader);
// If it has a long filename, include the name length
if (hasLongFilename())
result += path.toString().length() + 1;
// If its now odd lengthed, include the padding byte
if (result % 2 != 0 )
result++;
return result;
}
// This default constructor is only use by the ilist when it creates its
// sentry node. We give it specific static values to make it stand out a bit.
ArchiveMember::ArchiveMember()
: next(0), prev(0), parent(0), path("--invalid--"), flags(0), data(0)
{
info.user = sys::Process::GetCurrentUserId();
info.group = sys::Process::GetCurrentGroupId();
info.mode = 0777;
info.fileSize = 0;
info.modTime = sys::TimeValue::now();
}
// This is the constructor that the Archive class uses when it is building or
// reading an archive. It just defaults a few things and ensures the parent is
// set for the iplist. The Archive class fills in the ArchiveMember's data.
// This is required because correctly setting the data may depend on other
// things in the Archive.
ArchiveMember::ArchiveMember(Archive* PAR)
: next(0), prev(0), parent(PAR), path(), flags(0), data(0)
{
}
// This method allows an ArchiveMember to be replaced with the data for a
// different file, presumably as an update to the member. It also makes sure
// the flags are reset correctly.
void ArchiveMember::replaceWith(const sys::Path& newFile) {
assert(newFile.exists() && "Can't replace with a non-existent file");
data = 0;
path = newFile;
// SVR4 symbol tables have an empty name
if (path.toString() == ARFILE_SVR4_SYMTAB_NAME)
flags |= SVR4SymbolTableFlag;
else
flags &= ~SVR4SymbolTableFlag;
// BSD4.4 symbol tables have a special name
if (path.toString() == ARFILE_BSD4_SYMTAB_NAME)
flags |= BSD4SymbolTableFlag;
else
flags &= ~BSD4SymbolTableFlag;
// LLVM symbol tables have a very specific name
if (path.toString() == ARFILE_LLVM_SYMTAB_NAME)
flags |= LLVMSymbolTableFlag;
else
flags &= ~LLVMSymbolTableFlag;
// String table name
if (path.toString() == ARFILE_STRTAB_NAME)
flags |= StringTableFlag;
else
flags &= ~StringTableFlag;
// If it has a slash then it has a path
bool hasSlash = path.toString().find('/') != std::string::npos;
if (hasSlash)
flags |= HasPathFlag;
else
flags &= ~HasPathFlag;
// If it has a slash or its over 15 chars then its a long filename format
if (hasSlash || path.toString().length() > 15)
flags |= HasLongFilenameFlag;
else
flags &= ~HasLongFilenameFlag;
// Get the signature and status info
const char* signature = (const char*) data;
std::string magic;
if (!signature) {
path.getMagicNumber(magic,4);
signature = magic.c_str();
std::string err;
if (path.getFileStatus(info, &err))
throw err;
}
// Determine what kind of file it is
switch (sys::IdentifyFileType(signature,4)) {
case sys::BytecodeFileType:
flags |= BytecodeFlag;
break;
case sys::CompressedBytecodeFileType:
flags |= CompressedBytecodeFlag;
flags &= ~CompressedFlag;
break;
default:
flags &= ~(BytecodeFlag|CompressedBytecodeFlag);
break;
}
}
// Archive constructor - this is the only constructor that gets used for the
// Archive class. Everything else (default,copy) is deprecated. This just
// initializes and maps the file into memory, if requested.
Archive::Archive(const sys::Path& filename, bool map )
: archPath(filename), members(), mapfile(0), base(0), symTab(), strtab(),
symTabSize(0), firstFileOffset(0), modules(), foreignST(0)
{
if (map) {
mapfile = new sys::MappedFile(filename);
base = (char*) mapfile->map();
}
}
void Archive::cleanUpMemory() {
// Shutdown the file mapping
if (mapfile) {
mapfile->close();
delete mapfile;
mapfile = 0;
base = 0;
}
// Forget the entire symbol table
symTab.clear();
symTabSize = 0;
firstFileOffset = 0;
// Free the foreign symbol table member
if (foreignST) {
delete foreignST;
foreignST = 0;
}
// Delete any ModuleProviders and ArchiveMember's we've allocated as a result
// of symbol table searches.
for (ModuleMap::iterator I=modules.begin(), E=modules.end(); I != E; ++I ) {
delete I->second.first;
delete I->second.second;
}
}
// Archive destructor - just clean up memory
Archive::~Archive() {
cleanUpMemory();
}