Moved to lib/Bytecode/Archive in preparation for re-write.
llvm-svn: 17742
diff --git a/llvm/lib/Bytecode/Archive/ArchiveReader.cpp b/llvm/lib/Bytecode/Archive/ArchiveReader.cpp
new file mode 100644
index 0000000..b39dd7e
--- /dev/null
+++ b/llvm/lib/Bytecode/Archive/ArchiveReader.cpp
@@ -0,0 +1,194 @@
+//===- lib/Archive/ArchiveReader.cpp - Read LLVM archive files ------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Bytecode/Reader.h"
+#include "llvm/Module.h"
+#include "llvm/Support/FileUtilities.h"
+#include <cstdlib>
+#include <iostream>
+using namespace llvm;
+
+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
+ ArchiveSymbolTable, // Symbol table produced by ranlib.
+ };
+}
+
+/// 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, std::string MemberName,
+ unsigned char *MemberData, unsigned Size) {
+ // Check for sections with special names...
+ if (MemberName == "__.SYMDEF " || MemberName == "__.SYMDEF SORTED")
+ return ArchiveSymbolTable;
+ else if (MemberName == "// ")
+ return SVR4LongFilename;
+
+ // Check to see if it looks like an llvm object file...
+ if (Size >= 4 && !memcmp(MemberData, "llvm", 4))
+ return UserObject;
+
+ if (Size >= 4 && !memcmp(MemberData, "llvc", 4))
+ return UserObject;
+
+ return Unknown;
+}
+
+static inline bool Error(std::string *ErrorStr, const char *Message) {
+ if (ErrorStr) *ErrorStr = Message;
+ return true;
+}
+
+static bool ParseSymbolTableSection(unsigned char *Buffer, unsigned Size,
+ std::string *S) {
+ // Currently not supported (succeeds without doing anything)
+ return false;
+}
+
+static bool ReadArchiveBuffer(const std::string &ArchiveName,
+ 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<char> LongFilenames;
+
+ while (Length >= sizeof(ar_hdr)) {
+ ar_hdr *Hdr = (ar_hdr*)Buffer;
+ unsigned SizeFromHeader = atoi(Hdr->size);
+ if (SizeFromHeader + sizeof(ar_hdr) > Length)
+ return Error(ErrorStr, "invalid record length in archive file!");
+
+ unsigned char *MemberData = Buffer + sizeof(ar_hdr);
+ unsigned MemberSize = SizeFromHeader;
+ // Get name of archive member.
+ char *startp = Hdr->name;
+ char *endp = (char *) memchr (startp, '/', sizeof(ar_hdr));
+ if (memcmp (Hdr->name, "#1/", 3) == 0) {
+ // 4.4BSD/MacOSX long filenames are abbreviated as "#1/L", where L is an
+ // ASCII-coded decimal number representing the length of the name buffer,
+ // which is prepended to the archive member's contents.
+ unsigned NameLength = atoi (&Hdr->name[3]);
+ startp = (char *) MemberData;
+ endp = startp + NameLength;
+ MemberData += NameLength;
+ MemberSize -= NameLength;
+ } else if (startp == endp && isdigit (Hdr->name[1])) {
+ // SVR4 long filenames are abbreviated as "/I", where I is
+ // an ASCII-coded decimal index into the LongFilenames vector.
+ unsigned NameIndex = atoi (&Hdr->name[1]);
+ assert (LongFilenames.size () > NameIndex
+ && "SVR4-style long filename for archive member not found");
+ startp = &LongFilenames[NameIndex];
+ endp = strchr (startp, '/');
+ } else if (startp == endp && Hdr->name[1] == '/') {
+ // This is for the SVR4 long filename table (there might be other
+ // names starting with // but I don't know about them). Make sure that
+ // getObjectType sees it.
+ endp = &Hdr->name[sizeof (Hdr->name)];
+ }
+ if (!endp) {
+ // 4.4BSD/MacOSX *short* filenames are not guaranteed to have a
+ // terminator. Start at the end of the field and backtrack over spaces.
+ endp = startp + sizeof(Hdr->name);
+ while (endp[-1] == ' ')
+ --endp;
+ }
+ std::string MemberName (startp, endp);
+ std::string FullMemberName = ArchiveName + "(" + MemberName + ")";
+
+ switch (getObjectType(Hdr, MemberName, MemberData, MemberSize)) {
+ case SVR4LongFilename:
+ // If this is a long filename section, read all of the file names into the
+ // LongFilenames vector.
+ LongFilenames.assign (MemberData, MemberData + MemberSize);
+ break;
+ case UserObject: {
+ Module *M = ParseBytecodeBuffer(MemberData, MemberSize,
+ FullMemberName, ErrorStr);
+ if (!M) return true;
+ Objects.push_back(M);
+ break;
+ }
+ case ArchiveSymbolTable:
+ if (ParseSymbolTableSection(MemberData, MemberSize, ErrorStr))
+ return true;
+ break;
+ default:
+ std::cerr << "ReadArchiveBuffer: WARNING: Skipping unknown file: "
+ << FullMemberName << "\n";
+ break; // Just ignore unknown files.
+ }
+
+ // Round SizeFromHeader up to an even number...
+ SizeFromHeader = (SizeFromHeader+1)/2*2;
+ Buffer += sizeof(ar_hdr)+SizeFromHeader; // Move to the next entry
+ Length -= sizeof(ar_hdr)+SizeFromHeader;
+ }
+
+ return Length != 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 llvm::ReadArchiveFile(const std::string &Filename,
+ std::vector<Module*> &Objects,std::string *ErrorStr){
+ unsigned Length;
+
+ // mmap in the file all at once...
+ unsigned char *Buffer =
+ (unsigned char*)ReadFileIntoAddressSpace(Filename, Length);
+ if (Buffer == 0) {
+ if (ErrorStr) *ErrorStr = "Error reading file '" + Filename + "'!";
+ return true;
+ }
+
+ // Parse the archive files we mmap'ped in
+ bool Result = ReadArchiveBuffer(Filename, Buffer, Length, Objects, ErrorStr);
+
+ // Unmmap the archive...
+ UnmapFileFromAddressSpace(Buffer, Length);
+
+ if (Result) // Free any loaded objects
+ while (!Objects.empty()) {
+ delete Objects.back();
+ Objects.pop_back();
+ }
+
+ return Result;
+}