[Object]

* Add begin_dynamic_table() / end_dynamic_table() private interface to ELFObjectFile.
* Add begin_libraries_needed() / end_libraries_needed() interface to ObjectFile, for grabbing the list of needed libraries for a shared object or dynamic executable.
* Implement this new interface completely for ELF, leave stubs for COFF and MachO.
* Add 'llvm-readobj' tool for dumping ObjectFile information.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@151785 91177308-0d34-0410-b5e6-96231b3b80d8

tools/llvm-readobj/llvm-readobj.cpp

@@ -0,0 +1,188 @@
+/*===- pso-stub.c - Stub executable to run llvm bitcode files -------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//===----------------------------------------------------------------------===*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "llvm/Object/ObjectFile.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Support/Format.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/FormattedStream.h"
+
+using namespace llvm;
+using namespace llvm::object;
+
+static cl::opt<std::string>
+InputFilename(cl::Positional, cl::desc("<input object>"), cl::init(""));
+
+void DumpSymbolHeader() {
+  outs() << format("  %-32s", (const char*)"Name")
+         << format("  %-4s", (const char*)"Type")
+         << format("  %-16s", (const char*)"Address")
+         << format("  %-16s", (const char*)"Size")
+         << format("  %-16s", (const char*)"FileOffset")
+         << format("  %-26s", (const char*)"Flags")
+         << "\n";
+}
+
+const char *GetTypeStr(SymbolRef::Type Type) {
+  switch (Type) {
+  case SymbolRef::ST_Unknown: return "?";
+  case SymbolRef::ST_Data: return "DATA";
+  case SymbolRef::ST_Debug: return "DBG";
+  case SymbolRef::ST_File: return "FILE";
+  case SymbolRef::ST_Function: return "FUNC";
+  case SymbolRef::ST_Other: return "-";
+  }
+  return "INV";
+}
+
+std::string GetFlagStr(uint32_t Flags) {
+  std::string result;
+  if (Flags & SymbolRef::SF_Undefined)
+    result += "undef,";
+  if (Flags & SymbolRef::SF_Global)
+    result += "global,";
+  if (Flags & SymbolRef::SF_Weak)
+    result += "weak,";
+  if (Flags & SymbolRef::SF_Absolute)
+    result += "absolute,";
+  if (Flags & SymbolRef::SF_ThreadLocal)
+    result += "threadlocal,";
+  if (Flags & SymbolRef::SF_Common)
+    result += "common,";
+  if (Flags & SymbolRef::SF_FormatSpecific)
+    result += "formatspecific,";
+
+  // Remove trailing comma
+  if (result.size() > 0) {
+    result.erase(result.size() - 1);
+  }
+  return result;
+}
+
+void DumpSymbol(const SymbolRef &sym) {
+    StringRef Name;
+    SymbolRef::Type Type;
+    uint32_t Flags;
+    uint64_t Address;
+    uint64_t Size;
+    uint64_t FileOffset;
+    sym.getName(Name);
+    sym.getAddress(Address);
+    sym.getSize(Size);
+    sym.getFileOffset(FileOffset);
+    sym.getType(Type);
+    sym.getFlags(Flags);
+
+    // format() can't handle StringRefs
+    outs() << format("  %-32s", Name.str().c_str())
+           << format("  %-4s", GetTypeStr(Type))
+           << format("  %16"PRIx64, Address)
+           << format("  %16"PRIx64, Size)
+           << format("  %16"PRIx64, FileOffset)
+           << "  " << GetFlagStr(Flags)
+           << "\n";
+}
+
+
+// Iterate through the normal symbols in the ObjectFile
+void DumpSymbols(const ObjectFile *obj) {
+  error_code ec;
+  uint32_t count = 0;
+  outs() << "Symbols:\n";
+  symbol_iterator it = obj->begin_symbols();
+  symbol_iterator ie = obj->end_symbols();
+  while (it != ie) {
+    DumpSymbol(*it);
+    it.increment(ec);
+    if (ec)
+      report_fatal_error("Symbol iteration failed");
+    ++count;
+  }
+  outs() << "  Total: " << count << "\n\n";
+}
+
+// Iterate through the dynamic symbols in the ObjectFile.
+void DumpDynamicSymbols(const ObjectFile *obj) {
+  error_code ec;
+  uint32_t count = 0;
+  outs() << "Dynamic Symbols:\n";
+  symbol_iterator it = obj->begin_dynamic_symbols();
+  symbol_iterator ie = obj->end_dynamic_symbols();
+  while (it != ie) {
+    DumpSymbol(*it);
+    it.increment(ec);
+    if (ec)
+      report_fatal_error("Symbol iteration failed");
+    ++count;
+  }
+  outs() << "  Total: " << count << "\n\n";
+}
+
+void DumpLibrary(const LibraryRef &lib) {
+  StringRef path;
+  lib.getPath(path);
+  outs() << "  " << path << "\n";
+}
+
+// Iterate through needed libraries
+void DumpLibrariesNeeded(const ObjectFile *obj) {
+  error_code ec;
+  uint32_t count = 0;
+  library_iterator it = obj->begin_libraries_needed();
+  library_iterator ie = obj->end_libraries_needed();
+  outs() << "Libraries needed:\n";
+  while (it != ie) {
+    DumpLibrary(*it);
+    it.increment(ec);
+    if (ec)
+      report_fatal_error("Needed libraries iteration failed");
+    ++count;
+  }
+  outs() << "  Total: " << count << "\n\n";
+}
+
+int main(int argc, char** argv) {
+  error_code ec;
+  sys::PrintStackTraceOnErrorSignal();
+  PrettyStackTraceProgram X(argc, argv);
+
+  cl::ParseCommandLineOptions(argc, argv,
+                              "LLVM Object Reader\n");
+
+  if (InputFilename.empty()) {
+    errs() << "Please specify an input filename\n";
+    return 1;
+  }
+
+  // Open the object file
+  OwningPtr<MemoryBuffer> File;
+  if (MemoryBuffer::getFile(InputFilename, File)) {
+    errs() << InputFilename << ": Open failed\n";
+    return 1;
+  }
+
+  ObjectFile *obj = ObjectFile::createObjectFile(File.take());
+  if (!obj) {
+    errs() << InputFilename << ": Object type not recognized\n";
+  }
+
+  DumpSymbols(obj);
+  DumpDynamicSymbols(obj);
+  DumpLibrariesNeeded(obj);
+  return 0;
+}
+