//===-- ArchiveReader.cpp - Read LLVM archive files -------------*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by Reid Spencer and is distributed under the
+// This file was developed by Reid Spencer and is distributed under the
// University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// Builds up standard unix archive files (.a) containing LLVM bytecode.
#include "ArchiveInternals.h"
#include "llvm/Bytecode/Reader.h"
-
+#include "llvm/Support/Compressor.h"
+#include <memory>
using namespace llvm;
/// Read a variable-bit-rate encoded unsigned integer
-inline unsigned readInteger(const char*&At, const char*End) {
+inline unsigned readInteger(const char*&At, const char*End){
unsigned Shift = 0;
unsigned Result = 0;
-
+
do {
- if (At == End)
- throw std::string("Ran out of data reading vbr_uint!");
+ if (At == End)
+ return Result;
Result |= (unsigned)((*At++) & 0x7F) << Shift;
Shift += 7;
} while (At[-1] & 0x80);
}
// Completely parse the Archive's symbol table and populate symTab member var.
-void
-Archive::parseSymbolTable(const void* data, unsigned size) {
+bool
+Archive::parseSymbolTable(const void* data, unsigned size, std::string* error) {
const char* At = (const char*) data;
const char* End = At + size;
while (At < End) {
unsigned offset = readInteger(At, End);
+ if (At == End) {
+ if (error)
+ *error = "Ran out of data reading vbr_uint for symtab offset!";
+ return false;
+ }
unsigned length = readInteger(At, End);
- if (At + length > End)
- throw std::string("malformed symbol table");
+ if (At == End) {
+ if (error)
+ *error = "Ran out of data reading vbr_uint for symtab length!";
+ return false;
+ }
+ if (At + length > End) {
+ if (error)
+ *error = "Malformed symbol table: length not consistent with size";
+ return false;
+ }
// we don't care if it can't be inserted (duplicate entry)
symTab.insert(std::make_pair(std::string(At, length), offset));
At += length;
}
symTabSize = size;
+ return true;
}
// 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.
+// can be variable in size.
ArchiveMember*
-Archive::parseMemberHeader(const char*& At, const char* End) {
- assert(At + sizeof(ArchiveMemberHeader) < End && "Not enough data");
+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
ArchiveMemberHeader* Hdr = (ArchiveMemberHeader*)At;
At += sizeof(ArchiveMemberHeader);
- // Instantiate the ArchiveMember to be filled
- ArchiveMember* member = new ArchiveMember(this);
-
- // Extract the size and determine if the file is
+ // Extract the size and determine if the file is
// compressed or not (negative length).
int flags = 0;
int MemberSize = atoi(Hdr->size);
}
// Check the size of the member for sanity
- if (At + MemberSize > End)
- throw std::string("invalid member length in archive file");
+ if (At + MemberSize > End) {
+ if (error)
+ *error = "invalid member length in archive file";
+ return 0;
+ }
// Check the member signature
- if (!Hdr->checkSignature())
- throw std::string("invalid file 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
+ // 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. The special name
- // __LLVM_SYM_TAB__ identifies the symbol table for LLVM bytecode.
- // Anything else is a regular, short filename that is terminated with
+ // 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. The special name
+ // __LLVM_SYM_TAB__ identifies the symbol table for LLVM bytecode.
+ // Anything else is a regular, short filename that is terminated with
// a '/' and blanks.
std::string pathname;
At += len;
MemberSize -= len;
flags |= ArchiveMember::HasLongFilenameFlag;
- } else
- throw std::string("invalid long filename");
- } else if (Hdr->name[1] == '_' &&
+ } else {
+ if (error)
+ *error = "invalid long filename";
+ return 0;
+ }
+ } else if (Hdr->name[1] == '_' &&
(0 == memcmp(Hdr->name, ARFILE_LLVM_SYMTAB_NAME, 16))) {
// The member is using a long file name (>15 chars) format.
// This format is standard for 4.4BSD and Mac OSX operating
pathname.assign(ARFILE_STRTAB_NAME);
flags |= ArchiveMember::StringTableFlag;
} else {
- throw std::string("invalid string table name");
+ 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 {
- throw std::string("invalid SVR4 symbol table name");
+ if (error)
+ *error = "invalid SVR4 symbol table name";
+ return 0;
}
} else if (isdigit(Hdr->name[1])) {
unsigned index = atoi(&Hdr->name[1]);
last_p = p;
p++;
}
- if (p >= endp)
- throw std::string("missing name termiantor in string table");
+ if (p >= endp) {
+ if (error)
+ *error = "missing name termiantor in string table";
+ return 0;
+ }
} else {
- throw std::string("name index beyond string table");
+ if (error)
+ *error = "name index beyond string table";
+ return 0;
}
}
break;
case '_':
- if (Hdr->name[1] == '_' &&
+ if (Hdr->name[1] == '_' &&
(0 == memcmp(Hdr->name, ARFILE_BSD4_SYMTAB_NAME, 16))) {
pathname.assign(ARFILE_BSD4_SYMTAB_NAME);
flags |= ArchiveMember::BSD4SymbolTableFlag;
break;
}
+ // Instantiate the ArchiveMember to be filled
+ ArchiveMember* member = new ArchiveMember(this);
+
// Fill in fields of the ArchiveMember
member->next = 0;
member->prev = 0;
member->parent = this;
- member->path.setFile(pathname);
+ member->path.set(pathname);
member->info.fileSize = MemberSize;
member->info.modTime.fromEpochTime(atoi(Hdr->date));
- sscanf(Hdr->mode, "%o", &(member->info.mode));
+ unsigned int mode;
+ sscanf(Hdr->mode, "%o", &mode);
+ member->info.mode = mode;
member->info.user = atoi(Hdr->uid);
member->info.group = atoi(Hdr->gid);
member->flags = flags;
return member;
}
-void
-Archive::checkSignature() {
+bool
+Archive::checkSignature(std::string* error) {
// Check the magic string at file's header
- if (mapfile->size() < 8 || memcmp(base, ARFILE_MAGIC, 8))
- throw std::string("invalid signature for an archive file");
+ if (mapfile->size() < 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
+// 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.
-void
-Archive::loadArchive() {
+bool
+Archive::loadArchive(std::string* error) {
// Set up parsing
members.clear();
const char *At = base;
const char *End = base + mapfile->size();
- checkSignature();
+ if (!checkSignature(error))
+ return false;
+
At += 8; // Skip the magic string.
bool seenSymbolTable = false;
bool foundFirstFile = false;
while (At < End) {
- // parse the member header
+ // parse the member header
const char* Save = At;
- ArchiveMember* mbr = parseMemberHeader(At, End);
+ ArchiveMember* mbr = parseMemberHeader(At, End, error);
+ if (!mbr)
+ return false;
// check if this is the foreign symbol table
if (mbr->isSVR4SymbolTable() || mbr->isBSD4SymbolTable()) {
if ((intptr_t(At) & 1) == 1)
At++;
delete mbr;
- } else if (mbr->isLLVMSymbolTable()) {
+ } else if (mbr->isLLVMSymbolTable()) {
// This is the LLVM symbol table for the archive. If we've seen it
// already, its an error. Otherwise, parse the symbol table and move on.
- if (seenSymbolTable)
- throw std::string("invalid archive: multiple symbol tables");
- parseSymbolTable(mbr->getData(), mbr->getSize());
+ if (seenSymbolTable) {
+ if (error)
+ *error = "invalid archive: multiple symbol tables";
+ return false;
+ }
+ if (!parseSymbolTable(mbr->getData(), mbr->getSize(), error))
+ return false;
seenSymbolTable = true;
At += mbr->getSize();
if ((intptr_t(At) & 1) == 1)
At++;
}
}
+ return true;
}
// Open and completely load the archive file.
Archive*
-Archive::OpenAndLoad(const sys::Path& file, std::string* ErrorMessage) {
- try {
- std::auto_ptr<Archive> result ( new Archive(file, true));
- result->loadArchive();
- return result.release();
- } catch (const std::string& msg) {
- if (ErrorMessage) {
- *ErrorMessage = msg;
- }
+Archive::OpenAndLoad(const sys::Path& file, std::string* ErrorMessage)
+{
+ std::auto_ptr<Archive> result ( new Archive(file));
+ if (result->mapToMemory(ErrorMessage))
return 0;
- }
+ if (!result->loadArchive(ErrorMessage))
+ return 0;
+ return result.release();
}
// Get all the bytecode modules from the archive
for (iterator I=begin(), E=end(); I != E; ++I) {
if (I->isBytecode() || I->isCompressedBytecode()) {
- std::string FullMemberName = archPath.toString() +
+ std::string FullMemberName = archPath.toString() +
"(" + I->getPath().toString() + ")";
- Module* M = ParseBytecodeBuffer((const unsigned char*)I->getData(),
- I->getSize(), FullMemberName, ErrMessage);
+ Module* M = ParseBytecodeBuffer((const unsigned char*)I->getData(),
+ I->getSize(), FullMemberName,
+ Compressor::decompressToNewBuffer,
+ ErrMessage);
if (!M)
return true;
}
// Load just the symbol table from the archive file
-void
-Archive::loadSymbolTable() {
+bool
+Archive::loadSymbolTable(std::string* ErrorMsg) {
// Set up parsing
members.clear();
const char *End = base + mapfile->size();
// Make sure we're dealing with an archive
- checkSignature();
+ if (!checkSignature(ErrorMsg))
+ return false;
At += 8; // Skip signature
// Parse the first file member header
const char* FirstFile = At;
- ArchiveMember* mbr = parseMemberHeader(At, End);
+ 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
// Read the next one
FirstFile = At;
- mbr = parseMemberHeader(At, End);
+ mbr = parseMemberHeader(At, End, ErrorMsg);
+ if (!mbr) {
+ delete mbr;
+ return false;
+ }
}
if (mbr->isStringTable()) {
delete mbr;
// Get the next one
FirstFile = At;
- mbr = parseMemberHeader(At, End);
+ mbr = parseMemberHeader(At, End, ErrorMsg);
+ if (!mbr) {
+ delete mbr;
+ return false;
+ }
}
// See if its the symbol table
if (mbr->isLLVMSymbolTable()) {
- parseSymbolTable(mbr->getData(), mbr->getSize());
+ if (!parseSymbolTable(mbr->getData(), mbr->getSize(), ErrorMsg)) {
+ delete mbr;
+ return false;
+ }
+
At += mbr->getSize();
if ((intptr_t(At) & 1) == 1)
At++;
+ delete mbr;
+ // Can't be any more symtab headers so just advance
FirstFile = At;
} else {
// 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.
+ // 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);
}
firstFileOffset = FirstFile - base;
+ return true;
}
// Open the archive and load just the symbol tables
Archive*
Archive::OpenAndLoadSymbols(const sys::Path& file, std::string* ErrorMessage) {
- try {
- std::auto_ptr<Archive> result ( new Archive(file, true) );
- result->loadSymbolTable();
- return result.release();
- } catch (const std::string& msg) {
- if (ErrorMessage) {
- *ErrorMessage = msg;
- }
+ std::auto_ptr<Archive> result ( new Archive(file) );
+ if (result->mapToMemory(ErrorMessage))
return 0;
- }
+ if (!result->loadSymbolTable(ErrorMessage))
+ return 0;
+ return result.release();
}
// Look up one symbol in the symbol table and return a ModuleProvider for the
// module that defines that symbol.
-ModuleProvider*
-Archive::findModuleDefiningSymbol(const std::string& symbol) {
+ModuleProvider*
+Archive::findModuleDefiningSymbol(const std::string& symbol,
+ std::string* ErrMsg) {
SymTabType::iterator SI = symTab.find(symbol);
if (SI == symTab.end())
return 0;
- // The symbol table was previously constructed assuming that the members were
+ // The symbol table was previously constructed assuming that the members were
// written without the symbol table header. Because VBR encoding is used, the
// values could not be adjusted to account for the offset of the symbol table
// because that could affect the size of the symbol table due to VBR encoding.
- // We now have to account for this by adjusting the offset by the size of the
+ // We now have to account for this by adjusting the offset by the size of the
// symbol table and its header.
- unsigned fileOffset =
+ unsigned fileOffset =
SI->second + // offset in symbol-table-less file
firstFileOffset; // add offset to first "real" file in archive
// Module hasn't been loaded yet, we need to load it
const char* modptr = base + fileOffset;
- ArchiveMember* mbr = parseMemberHeader(modptr, base + mapfile->size());
+ ArchiveMember* mbr = parseMemberHeader(modptr, base + mapfile->size(),ErrMsg);
+ if (!mbr)
+ return 0;
// Now, load the bytecode module to get the ModuleProvider
- std::string FullMemberName = archPath.toString() + "(" +
+ std::string FullMemberName = archPath.toString() + "(" +
mbr->getPath().toString() + ")";
ModuleProvider* mp = getBytecodeBufferModuleProvider(
- (const unsigned char*) mbr->getData(), mbr->getSize(),
- FullMemberName, 0);
+ (const unsigned char*) mbr->getData(), mbr->getSize(),
+ FullMemberName, Decompressor, ErrMsg, 0);
+ if (!mp)
+ return 0;
modules.insert(std::make_pair(fileOffset, std::make_pair(mp, mbr)));
return mp;
}
-// Look up multiple symbols in the symbol table and return a set of
+// Look up multiple symbols in the symbol table and return a set of
// ModuleProviders that define those symbols.
-void
+bool
Archive::findModulesDefiningSymbols(std::set<std::string>& symbols,
- std::set<ModuleProvider*>& result)
-{
- assert(mapfile && base && "Can't findModulesDefiningSymbols on new archive");
+ std::set<ModuleProvider*>& result,
+ std::string* error) {
+ if (!mapfile || !base) {
+ if (error)
+ *error = "Empty archive invalid for finding modules defining symbols";
+ return false;
+ }
+
if (symTab.empty()) {
// We don't have a symbol table, so we must build it now but lets also
// make sure that we populate the modules table as we do this to ensure
unsigned offset = At - base - firstFileOffset;
// Parse the file's header
- ArchiveMember* mbr = parseMemberHeader(At, End);
+ ArchiveMember* mbr = parseMemberHeader(At, End, error);
+ if (!mbr)
+ return false;
// If it contains symbols
if (mbr->isBytecode() || mbr->isCompressedBytecode()) {
- // Get the symbols
+ // Get the symbols
std::vector<std::string> symbols;
- std::string FullMemberName = archPath.toString() + "(" +
+ std::string FullMemberName = archPath.toString() + "(" +
mbr->getPath().toString() + ")";
- ModuleProvider* MP = GetBytecodeSymbols((const unsigned char*)At,
- mbr->getSize(), FullMemberName, symbols);
+ ModuleProvider* MP =
+ GetBytecodeSymbols((const unsigned char*)At, mbr->getSize(),
+ FullMemberName, symbols,
+ Compressor::decompressToNewBuffer, error);
if (MP) {
// Insert the module's symbols into the symbol table
- for (std::vector<std::string>::iterator I = symbols.begin(),
+ for (std::vector<std::string>::iterator I = symbols.begin(),
E=symbols.end(); I != E; ++I ) {
symTab.insert(std::make_pair(*I, offset));
}
// modules.
modules.insert(std::make_pair(offset, std::make_pair(MP, mbr)));
} else {
- throw std::string("Can't parse bytecode member: ") +
- mbr->getPath().toString();
+ if (error)
+ *error = "Can't parse bytecode member: " +
+ mbr->getPath().toString() + ": " + *error;
+ delete mbr;
+ return false;
}
}
}
}
- // At this point we have a valid symbol table (one way or another) so we
+ // At this point we have a valid symbol table (one way or another) so we
// just use it to quickly find the symbols requested.
- for (std::set<std::string>::iterator I=symbols.begin(),
+ for (std::set<std::string>::iterator I=symbols.begin(),
E=symbols.end(); I != E;) {
// See if this symbol exists
- ModuleProvider* mp = findModuleDefiningSymbol(*I);
+ ModuleProvider* mp = findModuleDefiningSymbol(*I,error);
if (mp) {
// The symbol exists, insert the ModuleProvider into our result,
// duplicates wil be ignored
result.insert(mp);
- // Remove the symbol now that its been resolved, being careful to
+ // Remove the symbol now that its been resolved, being careful to
// post-increment the iterator.
symbols.erase(I++);
} else {
++I;
}
}
+ return true;
+}
+
+bool Archive::isBytecodeArchive() {
+ // Make sure the symTab has been loaded. In most cases this should have been
+ // done when the archive was constructed, but still, this is just in case.
+ if (!symTab.size())
+ if (!loadSymbolTable(0))
+ return false;
+
+ // Now that we know it's been loaded, return true
+ // if it has a size
+ if (symTab.size()) return true;
+
+ //We still can't be sure it isn't a bytecode archive
+ if (!loadArchive(0))
+ return false;
+
+ std::vector<Module *> Modules;
+ std::string ErrorMessage;
+
+ // Scan the archive, trying to load a bytecode member. We only load one to
+ // see if this works.
+ for (iterator I = begin(), E = end(); I != E; ++I) {
+ if (!I->isBytecode() && !I->isCompressedBytecode())
+ continue;
+
+ std::string FullMemberName =
+ archPath.toString() + "(" + I->getPath().toString() + ")";
+ Module* M = ParseBytecodeBuffer((const unsigned char*)I->getData(),
+ I->getSize(), FullMemberName);
+ if (!M)
+ return false; // Couldn't parse bytecode, not a bytecode archive.
+ delete M;
+ return true;
+ }
+
+ return false;
}
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