#include "llvm/Object/Archive.h"
#include "llvm/ADT/APInt.h"
+#include "llvm/Support/Endian.h"
#include "llvm/Support/MemoryBuffer.h"
using namespace llvm;
using namespace object;
-static const StringRef Magic = "!<arch>\n";
-
-namespace {
-struct ArchiveMemberHeader {
- char Name[16];
- char LastModified[12];
- char UID[6];
- char GID[6];
- char AccessMode[8];
- char Size[10]; //< Size of data, not including header or padding.
- char Terminator[2];
-
- ///! Get the name without looking up long names.
- StringRef getName() const {
- char EndCond;
- if (Name[0] == '/' || Name[0] == '#')
- EndCond = ' ';
- else
- EndCond = '/';
- StringRef::size_type end = StringRef(Name, sizeof(Name)).find(EndCond);
- if (end == StringRef::npos)
- end = sizeof(Name);
- assert(end <= sizeof(Name) && end > 0);
- // Don't include the EndCond if there is one.
- return StringRef(Name, end);
- }
-
- uint64_t getSize() const {
- APInt ret;
- StringRef(Size, sizeof(Size)).getAsInteger(10, ret);
- return ret.getZExtValue();
- }
-};
-}
-
-static const ArchiveMemberHeader *ToHeader(const char *base) {
- return reinterpret_cast<const ArchiveMemberHeader *>(base);
-}
-
+static const char *Magic = "!<arch>\n";
static bool isInternalMember(const ArchiveMemberHeader &amh) {
- const char *internals[] = {
+ static const char *const internals[] = {
"/",
"//",
"#_LLVM_SYM_TAB_#"
- };
+ };
StringRef name = amh.getName();
for (std::size_t i = 0; i < sizeof(internals) / sizeof(*internals); ++i) {
return false;
}
-Archive::Child Archive::Child::getNext() const {
- size_t SpaceToSkip = sizeof(ArchiveMemberHeader) +
- ToHeader(Data.data())->getSize();
- // If it's odd, add 1 to make it even.
- if (SpaceToSkip & 1)
- ++SpaceToSkip;
-
- const char *NextLoc = Data.data() + SpaceToSkip;
-
- // Check to see if this is past the end of the archive.
- if (NextLoc >= Parent->Data->getBufferEnd())
- return Child(Parent, StringRef(0, 0));
-
- size_t NextSize = sizeof(ArchiveMemberHeader) +
- ToHeader(NextLoc)->getSize();
-
- return Child(Parent, StringRef(NextLoc, NextSize));
-}
+void Archive::anchor() { }
error_code Archive::Child::getName(StringRef &Result) const {
StringRef name = ToHeader(Data.data())->getName();
}
// It's a long name.
// Get the offset.
- APInt offset;
- name.substr(1).getAsInteger(10, offset);
+ std::size_t offset;
+ if (name.substr(1).rtrim(" ").getAsInteger(10, offset))
+ llvm_unreachable("Long name offset is not an integer");
const char *addr = Parent->StringTable->Data.begin()
+ sizeof(ArchiveMemberHeader)
- + offset.getZExtValue();
+ + offset;
// Verify it.
if (Parent->StringTable == Parent->end_children()
|| addr < (Parent->StringTable->Data.begin()
+ sizeof(ArchiveMemberHeader)
+ Parent->StringTable->getSize()))
return object_error::parse_failed;
- Result = addr;
+
+ // GNU long file names end with a /.
+ if (Parent->kind() == K_GNU) {
+ StringRef::size_type End = StringRef(addr).find('/');
+ Result = StringRef(addr, End);
+ } else {
+ Result = addr;
+ }
return object_error::success;
} else if (name.startswith("#1/")) {
- APInt name_size;
- name.substr(3).getAsInteger(10, name_size);
- Result = Data.substr(0, name_size.getZExtValue());
+ uint64_t name_size;
+ if (name.substr(3).rtrim(" ").getAsInteger(10, name_size))
+ llvm_unreachable("Long name length is not an ingeter");
+ Result = Data.substr(sizeof(ArchiveMemberHeader), name_size);
return object_error::success;
}
// It's a simple name.
return object_error::success;
}
-uint64_t Archive::Child::getSize() const {
- uint64_t size = ToHeader(Data.data())->getSize();
- // Don't include attached name.
- StringRef name = ToHeader(Data.data())->getName();
- if (name.startswith("#1/")) {
- APInt name_size;
- name.substr(3).getAsInteger(10, name_size);
- size -= name_size.getZExtValue();
- }
- return size;
-}
-
-MemoryBuffer *Archive::Child::getBuffer() const {
- StringRef name;
- if (getName(name)) return NULL;
- int size = sizeof(ArchiveMemberHeader);
- if (name.startswith("#1/")) {
- APInt name_size;
- name.substr(3).getAsInteger(10, name_size);
- size += name_size.getZExtValue();
- }
- return MemoryBuffer::getMemBuffer(Data.substr(size, getSize()),
- name,
- false);
-}
-
error_code Archive::Child::getAsBinary(OwningPtr<Binary> &Result) const {
OwningPtr<Binary> ret;
- if (error_code ec =
- createBinary(getBuffer(), ret))
+ OwningPtr<MemoryBuffer> Buff;
+ if (error_code ec = getMemoryBuffer(Buff))
+ return ec;
+ if (error_code ec = createBinary(Buff.take(), ret))
return ec;
Result.swap(ret);
return object_error::success;
}
Archive::Archive(MemoryBuffer *source, error_code &ec)
- : Binary(Binary::isArchive, source)
- , StringTable(Child(this, StringRef(0, 0))) {
+ : Binary(Binary::ID_Archive, source) {
// Check for sufficient magic.
if (!source || source->getBufferSize()
< (8 + sizeof(ArchiveMemberHeader) + 2) // Smallest archive.
return;
}
- // Get the string table. It's the 3rd member.
- child_iterator StrTable = begin_children(false);
+ // Get the special members.
+ child_iterator i = begin_children(false);
child_iterator e = end_children();
- for (int i = 0; StrTable != e && i < 2; ++StrTable, ++i) {}
- // Check to see if there were 3 members, or the 3rd member wasn't named "//".
StringRef name;
- if (StrTable != e && !StrTable->getName(name) && name == "//")
- StringTable = StrTable;
+ if ((ec = i->getName(name)))
+ return;
+ // Below is the pattern that is used to figure out the archive format
+ // GNU archive format
+ // First member : / (points to the symbol table )
+ // Second member : // (may exist, if it exists, points to the string table)
+ // Note : The string table is used if the filename exceeds 15 characters
+ // BSD archive format
+ // First member : __.SYMDEF (points to the symbol table)
+ // There is no string table, if the filename exceeds 15 characters or has a
+ // embedded space, the filename has #1/<size>, The size represents the size
+ // of the filename that needs to be read after the archive header
+ // COFF archive format
+ // First member : /
+ // Second member : / (provides a directory of symbols)
+ // Third member : // contains the string table, this is present even if the
+ // string table is empty
+ if (name == "/") {
+ SymbolTable = i;
+ StringTable = e;
+ if (i != e) ++i;
+ if (i == e) {
+ ec = object_error::parse_failed;
+ return;
+ }
+ if ((ec = i->getName(name)))
+ return;
+ if (name[0] != '/') {
+ Format = K_GNU;
+ } else if ((name.size() > 1) && (name == "//")) {
+ Format = K_GNU;
+ StringTable = i;
+ ++i;
+ } else {
+ Format = K_COFF;
+ if (i != e) {
+ SymbolTable = i;
+ ++i;
+ }
+ if (i != e) {
+ StringTable = i;
+ }
+ }
+ } else if (name == "__.SYMDEF") {
+ Format = K_BSD;
+ SymbolTable = i;
+ StringTable = e;
+ }
ec = object_error::success;
}
Archive::child_iterator Archive::begin_children(bool skip_internal) const {
- const char *Loc = Data->getBufferStart() + Magic.size();
+ const char *Loc = Data->getBufferStart() + strlen(Magic);
size_t Size = sizeof(ArchiveMemberHeader) +
ToHeader(Loc)->getSize();
Child c(this, StringRef(Loc, Size));
Archive::child_iterator Archive::end_children() const {
return Child(this, StringRef(0, 0));
}
+
+error_code Archive::Symbol::getName(StringRef &Result) const {
+ Result = StringRef(Parent->SymbolTable->getBuffer().begin() + StringIndex);
+ return object_error::success;
+}
+
+error_code Archive::Symbol::getMember(child_iterator &Result) const {
+ const char *Buf = Parent->SymbolTable->getBuffer().begin();
+ const char *Offsets = Buf + 4;
+ uint32_t Offset = 0;
+ if (Parent->kind() == K_GNU) {
+ Offset = *(reinterpret_cast<const support::ubig32_t*>(Offsets)
+ + SymbolIndex);
+ } else if (Parent->kind() == K_BSD) {
+ llvm_unreachable("BSD format is not supported");
+ } else {
+ uint32_t MemberCount = *reinterpret_cast<const support::ulittle32_t*>(Buf);
+
+ // Skip offsets.
+ Buf += sizeof(support::ulittle32_t)
+ + (MemberCount * sizeof(support::ulittle32_t));
+
+ uint32_t SymbolCount = *reinterpret_cast<const support::ulittle32_t*>(Buf);
+
+ if (SymbolIndex >= SymbolCount)
+ return object_error::parse_failed;
+
+ // Skip SymbolCount to get to the indices table.
+ const char *Indices = Buf + sizeof(support::ulittle32_t);
+
+ // Get the index of the offset in the file member offset table for this
+ // symbol.
+ uint16_t OffsetIndex =
+ *(reinterpret_cast<const support::ulittle16_t*>(Indices)
+ + SymbolIndex);
+ // Subtract 1 since OffsetIndex is 1 based.
+ --OffsetIndex;
+
+ if (OffsetIndex >= MemberCount)
+ return object_error::parse_failed;
+
+ Offset = *(reinterpret_cast<const support::ulittle32_t*>(Offsets)
+ + OffsetIndex);
+ }
+
+ const char *Loc = Parent->getData().begin() + Offset;
+ size_t Size = sizeof(ArchiveMemberHeader) +
+ ToHeader(Loc)->getSize();
+ Result = Child(Parent, StringRef(Loc, Size));
+
+ return object_error::success;
+}
+
+Archive::Symbol Archive::Symbol::getNext() const {
+ Symbol t(*this);
+ // Go to one past next null.
+ t.StringIndex =
+ Parent->SymbolTable->getBuffer().find('\0', t.StringIndex) + 1;
+ ++t.SymbolIndex;
+ return t;
+}
+
+Archive::symbol_iterator Archive::begin_symbols() const {
+ const char *buf = SymbolTable->getBuffer().begin();
+ if (kind() == K_GNU) {
+ uint32_t symbol_count = 0;
+ symbol_count = *reinterpret_cast<const support::ubig32_t*>(buf);
+ buf += sizeof(uint32_t) + (symbol_count * (sizeof(uint32_t)));
+ } else if (kind() == K_BSD) {
+ llvm_unreachable("BSD archive format is not supported");
+ } else {
+ uint32_t member_count = 0;
+ uint32_t symbol_count = 0;
+ member_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
+ buf += 4 + (member_count * 4); // Skip offsets.
+ symbol_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
+ buf += 4 + (symbol_count * 2); // Skip indices.
+ }
+ uint32_t string_start_offset = buf - SymbolTable->getBuffer().begin();
+ return symbol_iterator(Symbol(this, 0, string_start_offset));
+}
+
+Archive::symbol_iterator Archive::end_symbols() const {
+ const char *buf = SymbolTable->getBuffer().begin();
+ uint32_t symbol_count = 0;
+ if (kind() == K_GNU) {
+ symbol_count = *reinterpret_cast<const support::ubig32_t*>(buf);
+ buf += sizeof(uint32_t) + (symbol_count * (sizeof(uint32_t)));
+ } else if (kind() == K_BSD) {
+ llvm_unreachable("BSD archive format is not supported");
+ } else {
+ uint32_t member_count = 0;
+ member_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
+ buf += 4 + (member_count * 4); // Skip offsets.
+ symbol_count = *reinterpret_cast<const support::ulittle32_t*>(buf);
+ }
+ return symbol_iterator(
+ Symbol(this, symbol_count, 0));
+}
+
+Archive::child_iterator Archive::findSym(StringRef name) const {
+ Archive::symbol_iterator bs = begin_symbols();
+ Archive::symbol_iterator es = end_symbols();
+ Archive::child_iterator result;
+
+ StringRef symname;
+ for (; bs != es; ++bs) {
+ if (bs->getName(symname))
+ return end_children();
+ if (symname == name) {
+ if (bs->getMember(result))
+ return end_children();
+ return result;
+ }
+ }
+ return end_children();
+}
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