-//===- ReadArchive.cpp - Code to read LLVM bytecode from .a files ---------===//
+//===-- ArchiveReader.cpp - Read LLVM archive files -------------*- C++ -*-===//
//
-// This file implements the ReadArchiveFile interface, which allows a linker to
-// read all of the LLVM bytecode files contained in a .a file. This file
-// understands the standard system .a file format. This can only handle the .a
-// variant prevalent on Linux systems so far, but may be extended. See
-// information in this source file for more information:
-// http://sources.redhat.com/cgi-bin/cvsweb.cgi/src/bfd/archive.c?cvsroot=src
+// 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 "llvm/Bytecode/Reader.h"
+#include "llvm/Bitcode/Archive.h"
+#include "ArchiveInternals.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Module.h"
-#include "Config/sys/stat.h"
-#include "Config/sys/mman.h"
-#include "Config/fcntl.h"
-
-namespace {
- struct ar_hdr {
- char name[16];
- char date[12];
- char uid[6];
- char gid[6];
- char mode[8];
- char size[10];
- char fmag[2]; // Always equal to '`\n'
- };
-
- enum ObjectType {
- UserObject, // A user .o/.bc file
- Unknown, // Unknown file, just ignore it
- SVR4LongFilename, // a "//" section used for long file names
- };
+#include "llvm/Support/MemoryBuffer.h"
+#include <cstdio>
+#include <cstdlib>
+#include <memory>
+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;
+}
+
+// Completely parse the Archive's symbol table and populate symTab member var.
+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 == 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.
+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. The special name
+ // __LLVM_SYM_TAB__ identifies the symbol table for LLVM bitcode.
+ // 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;
+ }
+ } 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
+ // systems. LLVM uses it similarly. In this format, the
+ // remainder of the name field (after #1/) specifies the
+ // length of the file name which occupy the first bytes of
+ // the member's data. The pathname already has the #1/ stripped.
+ pathname.assign(ARFILE_LLVM_SYMTAB_NAME);
+ flags |= ArchiveMember::LLVMSymbolTableFlag;
+ }
+ 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 termiantor 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;
+ }
-// getObjectType - Determine the type of object that this header represents.
-// This is capable of parsing the variety of special sections used for various
-// purposes.
-static enum ObjectType getObjectType(ar_hdr *H, unsigned Size) {
- // Check for sections with special names...
- if (!memcmp(H->name, "// ", 16))
- return SVR4LongFilename;
+ // Determine if this is a bitcode file
+ switch (sys::IdentifyFileType(At, 4)) {
+ case sys::Bitcode_FileType:
+ flags |= ArchiveMember::BitcodeFlag;
+ break;
+ default:
+ flags &= ~ArchiveMember::BitcodeFlag;
+ break;
+ }
+
+ // Instantiate the ArchiveMember to be filled
+ ArchiveMember* member = new ArchiveMember(this);
- // Check to see if it looks like an llvm object file...
- if (Size >= 4 && !memcmp(H+1, "llvm", 4))
- return UserObject;
+ // Fill in fields of the ArchiveMember
+ member->parent = this;
+ member->path.set(pathname);
+ member->info.fileSize = MemberSize;
+ member->info.modTime.fromEpochTime(atoi(Hdr->date));
+ 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;
+ member->data = At;
- return Unknown;
+ 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();
+ symTab.clear();
+ const char *At = base;
+ const char *End = mapfile->getBufferEnd();
+
+ if (!checkSignature(error))
+ return false;
+
+ At += 8; // Skip the magic string.
-static inline bool Error(std::string *ErrorStr, const char *Message) {
- if (ErrorStr) *ErrorStr = Message;
+ bool seenSymbolTable = false;
+ bool foundFirstFile = false;
+ while (At < End) {
+ // parse the member header
+ const char* Save = At;
+ ArchiveMember* mbr = parseMemberHeader(At, End, error);
+ if (!mbr)
+ return false;
+
+ // check if this is the foreign symbol table
+ if (mbr->isSVR4SymbolTable() || mbr->isBSD4SymbolTable()) {
+ // We just save this but don't do anything special
+ // with it. It doesn't count as the "first file".
+ if (foreignST) {
+ // What? Multiple foreign symbol tables? Just chuck it
+ // and retain the last one found.
+ delete foreignST;
+ }
+ foreignST = mbr;
+ 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++;
+ delete mbr;
+ } 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) {
+ 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++;
+ delete mbr; // We don't need this member in the list of members.
+ } 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;
+ }
+ members.push_back(mbr);
+ At += mbr->getSize();
+ if ((intptr_t(At) & 1) == 1)
+ At++;
+ }
+ }
return true;
}
-static bool ParseLongFilenameSection(unsigned char *Buffer, unsigned Size,
- std::vector<std::string> &LongFilenames,
- std::string *S) {
- if (!LongFilenames.empty())
- return Error(S, "archive file contains multiple long filename entries");
-
- while (Size) {
- // Long filename entries are newline delimited to keep the archive readable.
- unsigned char *Ptr = (unsigned char*)memchr(Buffer, '\n', Size);
- if (Ptr == 0)
- return Error(S, "archive long filename entry doesn't end with newline!");
- assert(*Ptr == '\n');
-
- if (Ptr == Buffer) break; // Last entry contains just a newline.
-
- unsigned char *End = Ptr;
- if (End[-1] == '/') --End; // Remove trailing / from name
-
- LongFilenames.push_back(std::string(Buffer, End));
- Size -= Ptr-Buffer+1;
- Buffer = Ptr+1;
+// Open and completely load the archive file.
+Archive*
+Archive::OpenAndLoad(const sys::Path& file, LLVMContext& C,
+ std::string* ErrorMessage) {
+ std::auto_ptr<Archive> result ( new Archive(file, C));
+ if (result->mapToMemory(ErrorMessage))
+ return 0;
+ if (!result->loadArchive(ErrorMessage))
+ return 0;
+ return result.release();
+}
+
+// Get all the bitcode modules from the archive
+bool
+Archive::getAllModules(std::vector<Module*>& Modules,
+ std::string* ErrMessage) {
+
+ for (iterator I=begin(), E=end(); I != E; ++I) {
+ if (I->isBitcode()) {
+ std::string FullMemberName = archPath.str() +
+ "(" + I->getPath().str() + ")";
+ MemoryBuffer *Buffer =
+ MemoryBuffer::getMemBufferCopy(StringRef(I->getData(), I->getSize()),
+ FullMemberName.c_str());
+
+ Module *M = ParseBitcodeFile(Buffer, Context, ErrMessage);
+ delete Buffer;
+ if (!M)
+ return true;
+
+ Modules.push_back(M);
+ }
}
-
return false;
}
+// Load just the symbol table from the archive file
+bool
+Archive::loadSymbolTable(std::string* ErrorMsg) {
-static bool ReadArchiveBuffer(const std::string &Filename,
- unsigned char *Buffer, unsigned Length,
- std::vector<Module*> &Objects,
- std::string *ErrorStr) {
- if (Length < 8 || memcmp(Buffer, "!<arch>\n", 8))
- return Error(ErrorStr, "signature incorrect for an archive file!");
- Buffer += 8; Length -= 8; // Skip the magic string.
-
- std::vector<std::string> LongFilenames;
-
- while (Length >= sizeof(ar_hdr)) {
- ar_hdr *Hdr = (ar_hdr*)Buffer;
- unsigned Size = atoi(Hdr->size);
- if (Size+sizeof(ar_hdr) > Length)
- return Error(ErrorStr, "invalid record length in archive file!");
-
- switch (getObjectType(Hdr, Size)) {
- case SVR4LongFilename:
- // If this is a long filename section, read all of the file names into the
- // LongFilenames vector.
- //
- if (ParseLongFilenameSection(Buffer+sizeof(ar_hdr), Size,
- LongFilenames, ErrorStr))
- return true;
- break;
- case UserObject: {
- Module *M = ParseBytecodeBuffer(Buffer+sizeof(ar_hdr), Size,
- Filename+":somefile", ErrorStr);
- if (!M) return true;
- Objects.push_back(M);
- break;
+ // Set up parsing
+ members.clear();
+ symTab.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;
+ 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++;
+ delete mbr;
+
+ // Read the next one
+ FirstFile = At;
+ mbr = parseMemberHeader(At, End, ErrorMsg);
+ if (!mbr) {
+ delete mbr;
+ return false;
}
- case Unknown:
- std::cerr << "ReadArchiveBuffer: WARNING: Skipping unknown file: ";
- std::cerr << std::string(Hdr->name, Hdr->name+sizeof(Hdr->name+1)) <<"\n";
- break; // Just ignore unknown files.
+ }
+
+ 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++;
+ delete mbr;
+ // Get the next one
+ FirstFile = At;
+ mbr = parseMemberHeader(At, End, ErrorMsg);
+ if (!mbr) {
+ delete mbr;
+ return false;
+ }
+ }
+
+ // See if its the symbol table
+ if (mbr->isLLVMSymbolTable()) {
+ if (!parseSymbolTable(mbr->getData(), mbr->getSize(), ErrorMsg)) {
+ delete mbr;
+ return false;
}
- // Round Size up to an even number...
- Size = (Size+1)/2*2;
- Buffer += sizeof(ar_hdr)+Size; // Move to the next entry
- Length -= sizeof(ar_hdr)+Size;
+ 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.
+ // Add the member to the members list
+ members.push_back(mbr);
}
- return Length != 0;
+ firstFileOffset = FirstFile - base;
+ return true;
+}
+
+// Open the archive and load just the symbol tables
+Archive* Archive::OpenAndLoadSymbols(const sys::Path& file,
+ LLVMContext& C,
+ std::string* ErrorMessage) {
+ std::auto_ptr<Archive> result ( new Archive(file, C) );
+ 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 the module that defines
+// that symbol.
+Module*
+Archive::findModuleDefiningSymbol(const std::string& symbol,
+ std::string* ErrMsg) {
+ SymTabType::iterator SI = symTab.find(symbol);
+ if (SI == symTab.end())
+ return 0;
-// ReadArchiveFile - Read bytecode files from the specified .a file, returning
-// true on error, or false on success. This does not support reading files from
-// standard input.
-//
-bool ReadArchiveFile(const std::string &Filename, std::vector<Module*> &Objects,
- std::string *ErrorStr) {
- int FD = open(Filename.c_str(), O_RDONLY);
- if (FD == -1)
- return Error(ErrorStr, "Error opening file!");
-
- // Stat the file to get its length...
- struct stat StatBuf;
- if (fstat(FD, &StatBuf) == -1 || StatBuf.st_size == 0)
- return Error(ErrorStr, "Error stat'ing file!");
-
- // mmap in the file all at once...
- int Length = StatBuf.st_size;
- unsigned char *Buffer = (unsigned char*)mmap(0, Length, PROT_READ,
- MAP_PRIVATE, FD, 0);
- if (Buffer == (unsigned char*)MAP_FAILED)
- return Error(ErrorStr, "Error mmapping file!");
-
- // Parse the archive files we mmap'ped in
- bool Result = ReadArchiveBuffer(Filename, Buffer, Length, Objects, ErrorStr);
+ // 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
+ // symbol table and its header.
+ unsigned fileOffset =
+ SI->second + // offset in symbol-table-less file
+ firstFileOffset; // add offset to first "real" file in archive
+
+ // See if the module is already loaded
+ ModuleMap::iterator MI = modules.find(fileOffset);
+ if (MI != modules.end())
+ return MI->second.first;
+
+ // Module hasn't been loaded yet, we need to load it
+ const char* modptr = base + fileOffset;
+ ArchiveMember* mbr = parseMemberHeader(modptr, mapfile->getBufferEnd(),
+ ErrMsg);
+ if (!mbr)
+ return 0;
+
+ // Now, load the bitcode module to get the Module.
+ std::string FullMemberName = archPath.str() + "(" +
+ mbr->getPath().str() + ")";
+ MemoryBuffer *Buffer =
+ MemoryBuffer::getMemBufferCopy(StringRef(mbr->getData(), mbr->getSize()),
+ FullMemberName.c_str());
- // Unmmap the archive...
- munmap((char*)Buffer, Length);
+ Module *m = getLazyBitcodeModule(Buffer, Context, ErrMsg);
+ if (!m)
+ return 0;
+
+ modules.insert(std::make_pair(fileOffset, std::make_pair(m, mbr)));
+
+ return m;
+}
+
+// Look up multiple symbols in the symbol table and return a set of
+// Modules that define those symbols.
+bool
+Archive::findModulesDefiningSymbols(std::set<std::string>& symbols,
+ SmallVectorImpl<Module*>& result,
+ std::string* error) {
+ if (!mapfile || !base) {
+ if (error)
+ *error = "Empty archive invalid for finding modules defining symbols";
+ return false;
+ }
- if (Result) // Free any loaded objects
- while (!Objects.empty()) {
- delete Objects.back();
- Objects.pop_back();
+ 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
+ // that we don't load them twice when findModuleDefiningSymbol is called
+ // below.
+
+ // Get a pointer to the first file
+ const char* At = base + firstFileOffset;
+ const char* End = mapfile->getBufferEnd();
+
+ while ( At < End) {
+ // Compute the offset to be put in the symbol table
+ unsigned offset = At - base - firstFileOffset;
+
+ // Parse the file's header
+ ArchiveMember* mbr = parseMemberHeader(At, End, error);
+ if (!mbr)
+ return false;
+
+ // If it contains symbols
+ if (mbr->isBitcode()) {
+ // Get the symbols
+ std::vector<std::string> symbols;
+ std::string FullMemberName = archPath.str() + "(" +
+ mbr->getPath().str() + ")";
+ Module* M =
+ GetBitcodeSymbols(At, mbr->getSize(), FullMemberName, Context,
+ symbols, error);
+
+ if (M) {
+ // Insert the module's symbols into the symbol table
+ for (std::vector<std::string>::iterator I = symbols.begin(),
+ E=symbols.end(); I != E; ++I ) {
+ symTab.insert(std::make_pair(*I, offset));
+ }
+ // Insert the Module and the ArchiveMember into the table of
+ // modules.
+ modules.insert(std::make_pair(offset, std::make_pair(M, mbr)));
+ } else {
+ if (error)
+ *error = "Can't parse bitcode member: " +
+ mbr->getPath().str() + ": " + *error;
+ delete mbr;
+ return false;
+ }
+ }
+
+ // Go to the next file location
+ At += mbr->getSize();
+ if ((intptr_t(At) & 1) == 1)
+ At++;
}
+ }
+
+ // At this point we have a valid symbol table (one way or another) so we
+ // just use it to quickly find the symbols requested.
+
+ SmallPtrSet<Module*, 16> Added;
+ for (std::set<std::string>::iterator I=symbols.begin(),
+ Next = I,
+ E=symbols.end(); I != E; I = Next) {
+ // Increment Next before we invalidate it.
+ ++Next;
+
+ // See if this symbol exists
+ Module* m = findModuleDefiningSymbol(*I,error);
+ if (!m)
+ continue;
+ bool NewMember = Added.insert(m);
+ if (!NewMember)
+ continue;
+
+ // The symbol exists, insert the Module into our result.
+ result.push_back(m);
+
+ // Remove the symbol now that its been resolved.
+ symbols.erase(I);
+ }
+ return true;
+}
+
+bool Archive::isBitcodeArchive() {
+ // 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.empty())
+ 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 bitcode archive
+ if (!loadArchive(0))
+ return false;
+
+ std::vector<Module *> Modules;
+ std::string ErrorMessage;
+
+ // Scan the archive, trying to load a bitcode member. We only load one to
+ // see if this works.
+ for (iterator I = begin(), E = end(); I != E; ++I) {
+ if (!I->isBitcode())
+ continue;
+
+ std::string FullMemberName =
+ archPath.str() + "(" + I->getPath().str() + ")";
+
+ MemoryBuffer *Buffer =
+ MemoryBuffer::getMemBufferCopy(StringRef(I->getData(), I->getSize()),
+ FullMemberName.c_str());
+ Module *M = ParseBitcodeFile(Buffer, Context);
+ delete Buffer;
+ if (!M)
+ return false; // Couldn't parse bitcode, not a bitcode archive.
+ delete M;
+ return true;
+ }
- return Result;
+ return false;
}
projects / oota-llvm.git / blobdiff