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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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67
include/llvm/Object/MachO.h
View File

@ -49,6 +49,57 @@ public:
};
typedef content_iterator<DiceRef> dice_iterator;
/// ExportEntry encapsulates the current-state-of-the-walk used when doing a
/// non-recursive walk of the trie data structure. This allows you to iterate
/// across all exported symbols using:
/// for (const llvm::object::ExportEntry &AnExport : Obj->exports()) {
/// }
class ExportEntry {
public:
ExportEntry(ArrayRef<uint8_t> Trie);
StringRef name() const;
uint64_t flags() const;
uint64_t address() const;
uint64_t other() const;
StringRef otherName() const;
uint32_t nodeOffset() const;
bool operator==(const ExportEntry &) const;
void moveNext();
private:
friend class MachOObjectFile;
void moveToFirst();
void moveToEnd();
uint64_t readULEB128(const uint8_t *&p);
void pushDownUntilBottom();
void pushNode(uint64_t Offset);
// Represents a node in the mach-o exports trie.
struct NodeState {
NodeState(const uint8_t *Ptr);
const uint8_t *Start;
const uint8_t *Current;
uint64_t Flags;
uint64_t Address;
uint64_t Other;
const char *ImportName;
unsigned ChildCount;
unsigned NextChildIndex;
unsigned ParentStringLength;
bool IsExportNode;
};
ArrayRef<uint8_t> Trie;
SmallString<256> CumulativeString;
SmallVector<NodeState, 16> Stack;
bool Malformed;
bool Done;
};
typedef content_iterator<ExportEntry> export_iterator;
class MachOObjectFile : public ObjectFile {
public:
struct LoadCommandInfo {
@ -119,7 +170,7 @@ public:
bool &Result) const override;
// MachO specific.
std::error_code getLibraryShortNameByIndex(unsigned Index, StringRef &Res);
std::error_code getLibraryShortNameByIndex(unsigned Index, StringRef &) const;
// TODO: Would be useful to have an iterator based version
// of the load command interface too.
@ -144,6 +195,12 @@ public:
dice_iterator begin_dices() const;
dice_iterator end_dices() const;
/// For use iterating over all exported symbols.
iterator_range<export_iterator> exports() const;
/// For use examining a trie not in a MachOObjectFile.
static iterator_range<export_iterator> exports(ArrayRef<uint8_t> Trie);
// In a MachO file, sections have a segment name. This is used in the .o
// files. They have a single segment, but this field specifies which segment
@ -207,6 +264,11 @@ public:
MachO::symtab_command getSymtabLoadCommand() const;
MachO::dysymtab_command getDysymtabLoadCommand() const;
MachO::linkedit_data_command getDataInCodeLoadCommand() const;
ArrayRef<uint8_t> getDyldInfoRebaseOpcodes() const;
ArrayRef<uint8_t> getDyldInfoBindOpcodes() const;
ArrayRef<uint8_t> getDyldInfoWeakBindOpcodes() const;
ArrayRef<uint8_t> getDyldInfoLazyBindOpcodes() const;
ArrayRef<uint8_t> getDyldInfoExportsTrie() const;
StringRef getStringTableData() const;
bool is64Bit() const;
@ -237,10 +299,11 @@ private:
typedef SmallVector<const char*, 1> LibraryList;
LibraryList Libraries;
typedef SmallVector<StringRef, 1> LibraryShortName;
LibraryShortName LibrariesShortNames;
mutable LibraryShortName LibrariesShortNames;
const char *SymtabLoadCmd;
const char *DysymtabLoadCmd;
const char *DataInCodeLoadCmd;
const char *DyldInfoLoadCmd;
};
/// DiceRef