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//===-- 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();
}
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