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-rw-r--r--lib/Archive/ArchiveReader.cpp199
1 files changed, 131 insertions, 68 deletions
diff --git a/lib/Archive/ArchiveReader.cpp b/lib/Archive/ArchiveReader.cpp
index f238f59882e..c8dd17c8f11 100644
--- a/lib/Archive/ArchiveReader.cpp
+++ b/lib/Archive/ArchiveReader.cpp
@@ -18,13 +18,13 @@
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!");
+ return Result;
Result |= (unsigned)((*At++) & 0x7F) << Shift;
Shift += 7;
} while (At[-1] & 0x80);
@@ -32,36 +32,48 @@ inline unsigned readInteger(const char*&At, const char*End) {
}
// 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.
ArchiveMember*
-Archive::parseMemberHeader(const char*& At, const char* End) {
+Archive::parseMemberHeader(const char*& At, const char* End, std::string* error)
+{
assert(At + sizeof(ArchiveMemberHeader) < End && "Not enough data");
// 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
// compressed or not (negative length).
int flags = 0;
@@ -72,12 +84,18 @@ Archive::parseMemberHeader(const char*& At, const char* End) {
}
// 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
@@ -100,8 +118,11 @@ Archive::parseMemberHeader(const char*& At, const char* End) {
At += len;
MemberSize -= len;
flags |= ArchiveMember::HasLongFilenameFlag;
- } else
- throw std::string("invalid long filename");
+ } 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.
@@ -120,14 +141,18 @@ Archive::parseMemberHeader(const char*& At, const char* End) {
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]);
@@ -145,10 +170,15 @@ Archive::parseMemberHeader(const char*& At, const char* End) {
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;
@@ -184,6 +214,9 @@ Archive::parseMemberHeader(const char*& At, const char* End) {
break;
}
+ // Instantiate the ArchiveMember to be filled
+ ArchiveMember* member = new ArchiveMember(this);
+
// Fill in fields of the ArchiveMember
member->next = 0;
member->prev = 0;
@@ -202,18 +235,22 @@ Archive::parseMemberHeader(const char*& At, const char* End) {
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
// 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();
@@ -221,7 +258,9 @@ Archive::loadArchive() {
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;
@@ -229,7 +268,9 @@ Archive::loadArchive() {
while (At < End) {
// 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()) {
@@ -257,9 +298,13 @@ Archive::loadArchive() {
} 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)
@@ -278,21 +323,17 @@ Archive::loadArchive() {
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, true));
+ if (!result->loadArchive(ErrorMessage))
return 0;
- }
+ return result.release();
}
// Get all the bytecode modules from the archive
@@ -315,8 +356,8 @@ Archive::getAllModules(std::vector<Module*>& Modules, std::string* ErrMessage) {
}
// Load just the symbol table from the archive file
-void
-Archive::loadSymbolTable() {
+bool
+Archive::loadSymbolTable(std::string* ErrorMsg) {
// Set up parsing
members.clear();
@@ -325,13 +366,16 @@ Archive::loadSymbolTable() {
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
@@ -342,7 +386,11 @@ Archive::loadSymbolTable() {
// Read the next one
FirstFile = At;
- mbr = parseMemberHeader(At, End);
+ mbr = parseMemberHeader(At, End, ErrorMsg);
+ if (!mbr) {
+ delete mbr;
+ return false;
+ }
}
if (mbr->isStringTable()) {
@@ -354,12 +402,20 @@ Archive::loadSymbolTable() {
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++;
@@ -375,27 +431,23 @@ Archive::loadSymbolTable() {
}
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, true) );
+ 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) {
+Archive::findModuleDefiningSymbol(const std::string& symbol,
+ std::string* ErrMsg) {
SymTabType::iterator SI = symTab.find(symbol);
if (SI == symTab.end())
return 0;
@@ -417,7 +469,9 @@ Archive::findModuleDefiningSymbol(const std::string& symbol) {
// 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 false;
// Now, load the bytecode module to get the ModuleProvider
std::string FullMemberName = archPath.toString() + "(" +
@@ -433,9 +487,10 @@ Archive::findModuleDefiningSymbol(const std::string& symbol) {
// 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)
+ std::set<ModuleProvider*>& result,
+ std::string* error)
{
assert(mapfile && base && "Can't findModulesDefiningSymbols on new archive");
if (symTab.empty()) {
@@ -453,7 +508,9 @@ Archive::findModulesDefiningSymbols(std::set<std::string>& symbols,
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()) {
@@ -474,8 +531,11 @@ Archive::findModulesDefiningSymbols(std::set<std::string>& symbols,
// 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();
+ delete mbr;
+ return false;
}
}
@@ -492,7 +552,7 @@ Archive::findModulesDefiningSymbols(std::set<std::string>& symbols,
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
@@ -505,20 +565,23 @@ Archive::findModulesDefiningSymbols(std::set<std::string>& symbols,
++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())
- loadSymbolTable();
+ 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
- loadArchive();
+ if (!loadArchive(0))
+ return false;
std::vector<Module *> Modules;
std::string ErrorMessage;