Don't use a potentially expensive shift if all we want is one set bit.

[oota-llvm.git] / tools / llvm-rtdyld / llvm-rtdyld.cpp

diff --git a/tools/llvm-rtdyld/llvm-rtdyld.cpp b/tools/llvm-rtdyld/llvm-rtdyld.cpp
index e06d798cd517c49fc5b97fc5c3ed819c67e9875c..b68f2a08d92726d4baf7fd936f2afeb6357cacc9 100644 (file)
--- a/tools/llvm-rtdyld/llvm-rtdyld.cpp
+++ b/tools/llvm-rtdyld/llvm-rtdyld.cpp
@@ -11,12 +11,13 @@
 //
 //===----------------------------------------------------------------------===//
 
-#include "llvm/ADT/StringMap.h"
 #include "llvm/ADT/OwningPtr.h"
-#include "llvm/ExecutionEngine/RuntimeDyld.h"
-#include "llvm/ExecutionEngine/ObjectImage.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/DebugInfo/DIContext.h"
 #include "llvm/ExecutionEngine/ObjectBuffer.h"
-#include "llvm/Object/MachOObject.h"
+#include "llvm/ExecutionEngine/ObjectImage.h"
+#include "llvm/ExecutionEngine/RuntimeDyld.h"
+#include "llvm/Object/MachO.h"
 #include "llvm/Support/CommandLine.h"
 #include "llvm/Support/ManagedStatic.h"
 #include "llvm/Support/Memory.h"
@@ -31,7 +32,8 @@ InputFileList(cl::Positional, cl::ZeroOrMore,
               cl::desc("<input file>"));
 
 enum ActionType {
-  AC_Execute
+  AC_Execute,
+  AC_PrintLineInfo
 };
 
 static cl::opt<ActionType>
@@ -39,6 +41,8 @@ Action(cl::desc("Action to perform:"),
        cl::init(AC_Execute),
        cl::values(clEnumValN(AC_Execute, "execute",
                              "Load, link, and execute the inputs."),
+                  clEnumValN(AC_PrintLineInfo, "printline",
+                             "Load, link, and print line information for each function."),
                   clEnumValEnd));
 
 static cl::opt<std::string>
@@ -65,7 +69,7 @@ public:
     return 0;
   }
 
-  bool applyPermissions(std::string *ErrMsg) { return false; }
+  bool finalizeMemory(std::string *ErrMsg) { return false; }
 
   // Invalidate instruction cache for sections with execute permissions.
   // Some platforms with separate data cache and instruction cache require
@@ -114,6 +118,66 @@ static int Error(const Twine &Msg) {
 
 /* *** */
 
+static int printLineInfoForInput() {
+  // If we don't have any input files, read from stdin.
+  if (!InputFileList.size())
+    InputFileList.push_back("-");
+  for(unsigned i = 0, e = InputFileList.size(); i != e; ++i) {
+    // Instantiate a dynamic linker.
+    TrivialMemoryManager *MemMgr = new TrivialMemoryManager;
+    RuntimeDyld Dyld(MemMgr);
+
+    // Load the input memory buffer.
+    OwningPtr<MemoryBuffer> InputBuffer;
+    OwningPtr<ObjectImage>  LoadedObject;
+    if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFileList[i],
+                                                     InputBuffer))
+      return Error("unable to read input: '" + ec.message() + "'");
+
+    // Load the object file
+    LoadedObject.reset(Dyld.loadObject(new ObjectBuffer(InputBuffer.take())));
+    if (!LoadedObject) {
+      return Error(Dyld.getErrorString());
+    }
+
+    // Resolve all the relocations we can.
+    Dyld.resolveRelocations();
+
+    OwningPtr<DIContext> Context(DIContext::getDWARFContext(LoadedObject->getObjectFile()));
+
+    // Use symbol info to iterate functions in the object.
+    error_code ec;
+    for (object::symbol_iterator I = LoadedObject->begin_symbols(),
+                                 E = LoadedObject->end_symbols();
+                          I != E && !ec;
+                          I.increment(ec)) {
+      object::SymbolRef::Type SymType;
+      if (I->getType(SymType)) continue;
+      if (SymType == object::SymbolRef::ST_Function) {
+        StringRef  Name;
+        uint64_t   Addr;
+        uint64_t   Size;
+        if (I->getName(Name)) continue;
+        if (I->getAddress(Addr)) continue;
+        if (I->getSize(Size)) continue;
+
+        outs() << "Function: " << Name << ", Size = " << Size << "\n";
+
+        DILineInfoTable Lines = Context->getLineInfoForAddressRange(Addr, Size);
+        DILineInfoTable::iterator  Begin = Lines.begin();
+        DILineInfoTable::iterator  End = Lines.end();
+        for (DILineInfoTable::iterator It = Begin; It != End; ++It) {
+          outs() << "  Line info @ " << It->first - Addr << ": "
+                 << It->second.getFileName()
+                 << ", line:" << It->second.getLine() << "\n";
+        }
+      }
+    }
+  }
+
+  return 0;
+}
+
 static int executeInput() {
   // Instantiate a dynamic linker.
   TrivialMemoryManager *MemMgr = new TrivialMemoryManager;
@@ -180,5 +244,7 @@ int main(int argc, char **argv) {
   switch (Action) {
   case AC_Execute:
     return executeInput();
+  case AC_PrintLineInfo:
+    return printLineInfoForInput();
   }
 }