mirror of
https://github.com/c64scene-ar/llvm-6502.git
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19ead5a9f1
Removes the last use of PathV1.h in llvm-ar. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184630 91177308-0d34-0410-b5e6-96231b3b80d8
309 lines
9.2 KiB
C++
309 lines
9.2 KiB
C++
//===-- ArchiveWriter.cpp - Write LLVM archive files ----------------------===//
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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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//
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// Builds up an LLVM archive file (.a) containing LLVM bitcode.
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//
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//===----------------------------------------------------------------------===//
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#include "Archive.h"
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#include "ArchiveInternals.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Process.h"
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#include "llvm/Support/Signals.h"
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#include "llvm/Support/system_error.h"
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#include <fstream>
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#include <iomanip>
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#include <ostream>
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using namespace llvm;
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// Write an integer using variable bit rate encoding. This saves a few bytes
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// per entry in the symbol table.
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static inline void writeInteger(unsigned num, std::ofstream& ARFile) {
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while (1) {
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if (num < 0x80) { // done?
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ARFile << (unsigned char)num;
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return;
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}
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// Nope, we are bigger than a character, output the next 7 bits and set the
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// high bit to say that there is more coming...
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ARFile << (unsigned char)(0x80 | ((unsigned char)num & 0x7F));
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num >>= 7; // Shift out 7 bits now...
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}
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}
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// Compute how many bytes are taken by a given VBR encoded value. This is needed
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// to pre-compute the size of the symbol table.
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static inline unsigned numVbrBytes(unsigned num) {
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// Note that the following nested ifs are somewhat equivalent to a binary
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// search. We split it in half by comparing against 2^14 first. This allows
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// most reasonable values to be done in 2 comparisons instead of 1 for
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// small ones and four for large ones. We expect this to access file offsets
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// in the 2^10 to 2^24 range and symbol lengths in the 2^0 to 2^8 range,
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// so this approach is reasonable.
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if (num < 1<<14) {
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if (num < 1<<7)
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return 1;
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else
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return 2;
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}
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if (num < 1<<21)
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return 3;
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if (num < 1<<28)
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return 4;
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return 5; // anything >= 2^28 takes 5 bytes
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}
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// Create an empty archive.
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Archive* Archive::CreateEmpty(StringRef FilePath, LLVMContext& C) {
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Archive* result = new Archive(FilePath, C);
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return result;
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}
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// Fill the ArchiveMemberHeader with the information from a member. If
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// TruncateNames is true, names are flattened to 15 chars or less. The sz field
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// is provided here instead of coming from the mbr because the member might be
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// stored compressed and the compressed size is not the ArchiveMember's size.
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// Furthermore compressed files have negative size fields to identify them as
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// compressed.
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bool
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Archive::fillHeader(const ArchiveMember &mbr, ArchiveMemberHeader& hdr,
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int sz, bool TruncateNames) const {
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// Set the permissions mode, uid and gid
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hdr.init();
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char buffer[32];
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sprintf(buffer, "%-8o", mbr.getMode());
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memcpy(hdr.mode,buffer,8);
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sprintf(buffer, "%-6u", mbr.getUser());
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memcpy(hdr.uid,buffer,6);
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sprintf(buffer, "%-6u", mbr.getGroup());
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memcpy(hdr.gid,buffer,6);
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// Set the last modification date
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uint64_t secondsSinceEpoch = mbr.getModTime().toEpochTime();
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sprintf(buffer,"%-12u", unsigned(secondsSinceEpoch));
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memcpy(hdr.date,buffer,12);
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std::string mbrPath = sys::path::filename(mbr.getPath());
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// Set the name field in one of its various flavors.
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bool writeLongName = false;
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if (mbr.isStringTable()) {
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memcpy(hdr.name,ARFILE_STRTAB_NAME,16);
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} else if (mbr.isSVR4SymbolTable()) {
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memcpy(hdr.name,ARFILE_SVR4_SYMTAB_NAME,16);
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} else if (mbr.isBSD4SymbolTable()) {
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memcpy(hdr.name,ARFILE_BSD4_SYMTAB_NAME,16);
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} else if (TruncateNames) {
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const char* nm = mbrPath.c_str();
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unsigned len = mbrPath.length();
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size_t slashpos = mbrPath.rfind('/');
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if (slashpos != std::string::npos) {
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nm += slashpos + 1;
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len -= slashpos +1;
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}
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if (len > 15)
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len = 15;
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memcpy(hdr.name,nm,len);
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hdr.name[len] = '/';
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} else if (mbrPath.length() < 16 && mbrPath.find('/') == std::string::npos) {
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memcpy(hdr.name,mbrPath.c_str(),mbrPath.length());
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hdr.name[mbrPath.length()] = '/';
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} else {
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std::string nm = "#1/";
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nm += utostr(mbrPath.length());
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memcpy(hdr.name,nm.data(),nm.length());
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if (sz < 0)
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sz -= mbrPath.length();
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else
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sz += mbrPath.length();
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writeLongName = true;
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}
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// Set the size field
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if (sz < 0) {
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buffer[0] = '-';
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sprintf(&buffer[1],"%-9u",(unsigned)-sz);
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} else {
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sprintf(buffer, "%-10u", (unsigned)sz);
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}
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memcpy(hdr.size,buffer,10);
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return writeLongName;
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}
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// Insert a file into the archive before some other member. This also takes care
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// of extracting the necessary flags and information from the file.
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bool Archive::addFileBefore(StringRef filePath, iterator where,
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std::string *ErrMsg) {
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if (!sys::fs::exists(filePath)) {
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if (ErrMsg)
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*ErrMsg = "Can not add a non-existent file to archive";
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return true;
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}
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ArchiveMember* mbr = new ArchiveMember(this);
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mbr->data = 0;
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mbr->path = filePath;
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sys::fs::file_status Status;
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error_code EC = sys::fs::status(filePath, Status);
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if (EC) {
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delete mbr;
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return true;
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}
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mbr->User = Status.getUser();
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mbr->Group = Status.getGroup();
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mbr->Mode = Status.permissions();
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mbr->ModTime = Status.getLastModificationTime();
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// FIXME: On posix this is a second stat.
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EC = sys::fs::file_size(filePath, mbr->Size);
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if (EC) {
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delete mbr;
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return true;
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}
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unsigned flags = 0;
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if (sys::path::filename(filePath).size() > 15)
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flags |= ArchiveMember::HasLongFilenameFlag;
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sys::fs::file_magic type;
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if (sys::fs::identify_magic(mbr->path, type))
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type = sys::fs::file_magic::unknown;
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switch (type) {
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case sys::fs::file_magic::bitcode:
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flags |= ArchiveMember::BitcodeFlag;
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break;
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default:
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break;
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}
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mbr->flags = flags;
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members.insert(where,mbr);
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return false;
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}
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// Write one member out to the file.
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bool
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Archive::writeMember(
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const ArchiveMember& member,
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raw_fd_ostream& ARFile,
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bool TruncateNames,
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std::string* ErrMsg
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) {
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uint64_t filepos = ARFile.tell();
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filepos -= 8;
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// Get the data and its size either from the
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// member's in-memory data or directly from the file.
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size_t fSize = member.getSize();
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const char *data = (const char*)member.getData();
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MemoryBuffer *mFile = 0;
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if (!data) {
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OwningPtr<MemoryBuffer> File;
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if (error_code ec = MemoryBuffer::getFile(member.getPath(), File)) {
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if (ErrMsg)
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*ErrMsg = ec.message();
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return true;
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}
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mFile = File.take();
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data = mFile->getBufferStart();
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fSize = mFile->getBufferSize();
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}
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int hdrSize = fSize;
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// Compute the fields of the header
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ArchiveMemberHeader Hdr;
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bool writeLongName = fillHeader(member,Hdr,hdrSize,TruncateNames);
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// Write header to archive file
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ARFile.write((char*)&Hdr, sizeof(Hdr));
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// Write the long filename if its long
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if (writeLongName) {
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StringRef Name = sys::path::filename(member.getPath());
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ARFile.write(Name.data(), Name.size());
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}
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// Write the (possibly compressed) member's content to the file.
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ARFile.write(data,fSize);
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// Make sure the member is an even length
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if ((ARFile.tell() & 1) == 1)
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ARFile << ARFILE_PAD;
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// Close the mapped file if it was opened
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delete mFile;
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return false;
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}
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// Write the entire archive to the file specified when the archive was created.
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// This writes to a temporary file first. Options are for creating a symbol
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// table, flattening the file names (no directories, 15 chars max) and
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// compressing each archive member.
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bool Archive::writeToDisk(bool TruncateNames, std::string *ErrMsg) {
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// Make sure they haven't opened up the file, not loaded it,
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// but are now trying to write it which would wipe out the file.
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if (members.empty() && mapfile && mapfile->getBufferSize() > 8) {
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if (ErrMsg)
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*ErrMsg = "Can't write an archive not opened for writing";
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return true;
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}
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// Create a temporary file to store the archive in
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int TmpArchiveFD;
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SmallString<128> TmpArchive;
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error_code EC = sys::fs::unique_file("temp-archive-%%%%%%%.a", TmpArchiveFD,
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TmpArchive, true, 0666);
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if (EC)
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return true;
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// Make sure the temporary gets removed if we crash
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sys::RemoveFileOnSignal(TmpArchive);
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// Create archive file for output.
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raw_fd_ostream ArchiveFile(TmpArchiveFD, true);
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// Write magic string to archive.
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ArchiveFile << ARFILE_MAGIC;
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// Loop over all member files, and write them out. Note that this also
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// builds the symbol table, symTab.
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for (MembersList::iterator I = begin(), E = end(); I != E; ++I) {
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if (writeMember(*I, ArchiveFile, TruncateNames, ErrMsg)) {
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sys::fs::remove(Twine(TmpArchive));
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ArchiveFile.close();
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return true;
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}
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}
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// Close archive file.
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ArchiveFile.close();
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// Before we replace the actual archive, we need to forget all the
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// members, since they point to data in that old archive. We need to do
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// this because we cannot replace an open file on Windows.
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cleanUpMemory();
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if (sys::fs::rename(Twine(TmpArchive), archPath)) {
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*ErrMsg = EC.message();
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return true;
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}
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return false;
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}
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