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-rw-r--r--tools/llvm-ar/ArchiveReader.cpp317
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diff --git a/tools/llvm-ar/ArchiveReader.cpp b/tools/llvm-ar/ArchiveReader.cpp
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-//===-- ArchiveReader.cpp - Read LLVM archive files -------------*- C++ -*-===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// Builds up standard unix archive files (.a) containing LLVM bitcode.
-//
-//===----------------------------------------------------------------------===//
-
-#include "Archive.h"
-#include "ArchiveInternals.h"
-#include "llvm/ADT/OwningPtr.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/Bitcode/ReaderWriter.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Support/FileSystem.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include <cstdio>
-#include <cstdlib>
-using namespace llvm;
-
-/// Read a variable-bit-rate encoded unsigned integer
-static inline unsigned readInteger(const char*&At, const char*End) {
- unsigned Shift = 0;
- unsigned Result = 0;
-
- do {
- if (At == End)
- return Result;
- Result |= (unsigned)((*At++) & 0x7F) << Shift;
- Shift += 7;
- } while (At[-1] & 0x80);
- return Result;
-}
-
-// This member parses an ArchiveMemberHeader that is presumed to be pointed to
-// by At. The At pointer is updated to the byte just after the header, which
-// can be variable in size.
-ArchiveMember*
-Archive::parseMemberHeader(const char*& At, const char* End, std::string* error)
-{
- if (At + sizeof(ArchiveMemberHeader) >= End) {
- if (error)
- *error = "Unexpected end of file";
- return 0;
- }
-
- // Cast archive member header
- const ArchiveMemberHeader* Hdr = (const ArchiveMemberHeader*)At;
- At += sizeof(ArchiveMemberHeader);
-
- int flags = 0;
- int MemberSize = atoi(Hdr->size);
- assert(MemberSize >= 0);
-
- // Check the size of the member for sanity
- if (At + MemberSize > End) {
- if (error)
- *error = "invalid member length in archive file";
- return 0;
- }
-
- // Check the member signature
- if (!Hdr->checkSignature()) {
- if (error)
- *error = "invalid file member signature";
- return 0;
- }
-
- // Convert and check the member name
- // The empty name ( '/' and 15 blanks) is for a foreign (non-LLVM) symbol
- // table. The special name "//" and 14 blanks is for a string table, used
- // for long file names. This library doesn't generate either of those but
- // it will accept them. If the name starts with #1/ and the remainder is
- // digits, then those digits specify the length of the name that is
- // stored immediately following the header. Anything else is a regular, short
- // filename that is terminated with a '/' and blanks.
-
- std::string pathname;
- switch (Hdr->name[0]) {
- case '#':
- if (Hdr->name[1] == '1' && Hdr->name[2] == '/') {
- if (isdigit(Hdr->name[3])) {
- unsigned len = atoi(&Hdr->name[3]);
- const char *nulp = (const char *)memchr(At, '\0', len);
- pathname.assign(At, nulp != 0 ? (uintptr_t)(nulp - At) : len);
- At += len;
- MemberSize -= len;
- flags |= ArchiveMember::HasLongFilenameFlag;
- } else {
- if (error)
- *error = "invalid long filename";
- return 0;
- }
- }
- break;
- case '/':
- if (Hdr->name[1]== '/') {
- if (0 == memcmp(Hdr->name, ARFILE_STRTAB_NAME, 16)) {
- pathname.assign(ARFILE_STRTAB_NAME);
- flags |= ArchiveMember::StringTableFlag;
- } else {
- if (error)
- *error = "invalid string table name";
- return 0;
- }
- } else if (Hdr->name[1] == ' ') {
- if (0 == memcmp(Hdr->name, ARFILE_SVR4_SYMTAB_NAME, 16)) {
- pathname.assign(ARFILE_SVR4_SYMTAB_NAME);
- flags |= ArchiveMember::SVR4SymbolTableFlag;
- } else {
- if (error)
- *error = "invalid SVR4 symbol table name";
- return 0;
- }
- } else if (isdigit(Hdr->name[1])) {
- unsigned index = atoi(&Hdr->name[1]);
- if (index < strtab.length()) {
- const char* namep = strtab.c_str() + index;
- const char* endp = strtab.c_str() + strtab.length();
- const char* p = namep;
- const char* last_p = p;
- while (p < endp) {
- if (*p == '\n' && *last_p == '/') {
- pathname.assign(namep, last_p - namep);
- flags |= ArchiveMember::HasLongFilenameFlag;
- break;
- }
- last_p = p;
- p++;
- }
- if (p >= endp) {
- if (error)
- *error = "missing name terminator in string table";
- return 0;
- }
- } else {
- if (error)
- *error = "name index beyond string table";
- return 0;
- }
- }
- break;
- case '_':
- if (Hdr->name[1] == '_' &&
- (0 == memcmp(Hdr->name, ARFILE_BSD4_SYMTAB_NAME, 16))) {
- pathname.assign(ARFILE_BSD4_SYMTAB_NAME);
- flags |= ArchiveMember::BSD4SymbolTableFlag;
- break;
- }
- /* FALL THROUGH */
-
- default:
- const char* slash = (const char*) memchr(Hdr->name, '/', 16);
- if (slash == 0)
- slash = Hdr->name + 16;
- pathname.assign(Hdr->name, slash - Hdr->name);
- break;
- }
-
- // Instantiate the ArchiveMember to be filled
- ArchiveMember* member = new ArchiveMember(this);
-
- // Fill in fields of the ArchiveMember
- member->parent = this;
- member->path = pathname;
- member->Size = MemberSize;
- member->ModTime.fromEpochTime(atoi(Hdr->date));
- unsigned int mode;
- sscanf(Hdr->mode, "%o", &mode);
- member->Mode = mode;
- member->User = atoi(Hdr->uid);
- member->Group = atoi(Hdr->gid);
- member->flags = flags;
- member->data = At;
-
- return member;
-}
-
-bool
-Archive::checkSignature(std::string* error) {
- // Check the magic string at file's header
- if (mapfile->getBufferSize() < 8 || memcmp(base, ARFILE_MAGIC, 8)) {
- if (error)
- *error = "invalid signature for an archive file";
- return false;
- }
- return true;
-}
-
-// This function loads the entire archive and fully populates its ilist with
-// the members of the archive file. This is typically used in preparation for
-// editing the contents of the archive.
-bool
-Archive::loadArchive(std::string* error) {
-
- // Set up parsing
- members.clear();
- const char *At = base;
- const char *End = mapfile->getBufferEnd();
-
- if (!checkSignature(error))
- return false;
-
- At += 8; // Skip the magic string.
-
- bool foundFirstFile = false;
- while (At < End) {
- // parse the member header
- const char* Save = At;
- OwningPtr<ArchiveMember> mbr(parseMemberHeader(At, End, error));
- if (!mbr)
- return false;
-
- // check if this is the foreign symbol table
- if (mbr->isSVR4SymbolTable() || mbr->isBSD4SymbolTable()) {
- At += mbr->getSize();
- if ((intptr_t(At) & 1) == 1)
- At++;
- } else if (mbr->isStringTable()) {
- // Simply suck the entire string table into a string
- // variable. This will be used to get the names of the
- // members that use the "/ddd" format for their names
- // (SVR4 style long names).
- strtab.assign(At, mbr->getSize());
- At += mbr->getSize();
- if ((intptr_t(At) & 1) == 1)
- At++;
- } else {
- // This is just a regular file. If its the first one, save its offset.
- // Otherwise just push it on the list and move on to the next file.
- if (!foundFirstFile) {
- firstFileOffset = Save - base;
- foundFirstFile = true;
- }
- At += mbr->getSize();
- members.push_back(mbr.take());
- if ((intptr_t(At) & 1) == 1)
- At++;
- }
- }
- return true;
-}
-
-// Open and completely load the archive file.
-Archive*
-Archive::OpenAndLoad(StringRef File, LLVMContext& C,
- std::string* ErrorMessage) {
- OwningPtr<Archive> result(new Archive(File, C));
- if (result->mapToMemory(ErrorMessage))
- return NULL;
- if (!result->loadArchive(ErrorMessage))
- return NULL;
- return result.take();
-}
-
-// Load just the symbol table from the archive file
-bool
-Archive::loadSymbolTable(std::string* ErrorMsg) {
-
- // Set up parsing
- members.clear();
- const char *At = base;
- const char *End = mapfile->getBufferEnd();
-
- // Make sure we're dealing with an archive
- if (!checkSignature(ErrorMsg))
- return false;
-
- At += 8; // Skip signature
-
- // Parse the first file member header
- const char* FirstFile = At;
- OwningPtr<ArchiveMember> mbr(parseMemberHeader(At, End, ErrorMsg));
- if (!mbr)
- return false;
-
- if (mbr->isSVR4SymbolTable() || mbr->isBSD4SymbolTable()) {
- // Skip the foreign symbol table, we don't do anything with it
- At += mbr->getSize();
- if ((intptr_t(At) & 1) == 1)
- At++;
-
- // Read the next one
- FirstFile = At;
- mbr.reset(parseMemberHeader(At, End, ErrorMsg));
- if (!mbr)
- return false;
- }
-
- if (mbr->isStringTable()) {
- // Process the string table entry
- strtab.assign((const char*)mbr->getData(), mbr->getSize());
- At += mbr->getSize();
- if ((intptr_t(At) & 1) == 1)
- At++;
-
- // Get the next one
- FirstFile = At;
- mbr.reset(parseMemberHeader(At, End, ErrorMsg));
- if (!mbr)
- return false;
- }
-
- // There's no symbol table in the file. We have to rebuild it from scratch
- // because the intent of this method is to get the symbol table loaded so
- // it can be searched efficiently.
- // Add the member to the members list
- members.push_back(mbr.take());
-
- firstFileOffset = FirstFile - base;
- return true;
-}
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