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Object/llvm-objdump: allow dumping of mach-o exports trie

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MachOObjectFile in lib/Object currently has no support for parsing the rebase, 
binding, and export information from the LC_DYLD_INFO load command in final 
linked mach-o images. This patch adds support for parsing the exports trie data
structure. It also adds an option to llvm-objdump to dump that export info.

I did the exports parsing first because it is the hardest. The information is 
encoded in a trie structure, but the standard ObjectFile way to inspect content 
is through iterators. So I needed to make an iterator that would do a 
non-recursive walk through the trie and maintain the concatenation of edges 
needed for the current string prefix.

I plan to add similar support in MachOObjectFile and llvm-objdump to 
parse/display the rebasing and binding info too.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216808 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Kledzik
2014-08-30 00:20:14 +00:00
parent 4e92383b67
commit aa4d2acf37
8 changed files with 397 additions and 7 deletions
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60
tools/llvm-objdump/MachODump.cpp
View File

@ -1783,3 +1783,63 @@ void llvm::printMachOFileHeader(const object::ObjectFile *Obj) {
getAndPrintMachHeader(file, ncmds, filetype, cputype, true);
PrintLoadCommands(file, ncmds, filetype, cputype, true);
}
//===----------------------------------------------------------------------===//
// export trie dumping
//===----------------------------------------------------------------------===//
void llvm::printMachOExportsTrie(const object::MachOObjectFile *Obj) {
for (const llvm::object::ExportEntry &entry : Obj->exports()) {
uint64_t Flags = entry.flags();
bool ReExport = (Flags & MachO::EXPORT_SYMBOL_FLAGS_REEXPORT);
bool WeakDef = (Flags & MachO::EXPORT_SYMBOL_FLAGS_WEAK_DEFINITION);
bool ThreadLocal = ((Flags & MachO::EXPORT_SYMBOL_FLAGS_KIND_MASK) ==
MachO::EXPORT_SYMBOL_FLAGS_KIND_THREAD_LOCAL);
bool Abs = ((Flags & MachO::EXPORT_SYMBOL_FLAGS_KIND_MASK) ==
MachO::EXPORT_SYMBOL_FLAGS_KIND_ABSOLUTE);
bool Resolver = (Flags & MachO::EXPORT_SYMBOL_FLAGS_STUB_AND_RESOLVER);
if (ReExport)
outs() << "[re-export] ";
else
outs()
<< format("0x%08llX ", entry.address()); // FIXME:add in base address
outs() << entry.name();
if (WeakDef || ThreadLocal || Resolver || Abs) {
bool needComma = false;
printf(" [");
if (WeakDef) {
outs() << "weak_def";
needComma = true;
}
if (ThreadLocal) {
if (needComma)
outs() << ", ";
outs() << "per-thread";
needComma = true;
}
if (Abs) {
if (needComma)
outs() << ", ";
outs() << "absolute";
needComma = true;
}
if (Resolver) {
if (needComma)
outs() << ", ";
outs() << format("resolver=0x%08llX", entry.other());
needComma = true;
}
outs() << "]";
}
if (ReExport) {
StringRef DylibName = "unknown";
int ordinal = entry.other() - 1;
Obj->getLibraryShortNameByIndex(ordinal, DylibName);
if (entry.otherName().empty())
outs() << " (from " << DylibName << ")";
else
outs() << " (" << entry.otherName() << " from " << DylibName << ")";
}
outs() << "\n";
}
}