Import LLVM, at r72732.

1 files changed, 77 insertions, 0 deletions

diff --git a/lib/Support/Debug.cpp b/lib/Support/Debug.cpp
new file mode 100644
index 0000000..a09cddf
--- /dev/null
+++ b/lib/Support/Debug.cpp
@@ -0,0 +1,77 @@
+//===-- Debug.cpp - An easy way to add debug output to your code ----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements a handle way of adding debugging information to your
+// code, without it being enabled all of the time, and without having to add
+// command line options to enable it.
+//
+// In particular, just wrap your code with the DEBUG() macro, and it will be
+// enabled automatically if you specify '-debug' on the command-line.
+// Alternatively, you can also use the SET_DEBUG_TYPE("foo") macro to specify
+// that your debug code belongs to class "foo".  Then, on the command line, you
+// can specify '-debug-only=foo' to enable JUST the debug information for the
+// foo class.
+//
+// When compiling in release mode, the -debug-* options and all code in DEBUG()
+// statements disappears, so it does not effect the runtime of the code.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Debug.h"
+using namespace llvm;
+
+bool llvm::DebugFlag;  // DebugFlag - Exported boolean set by the -debug option
+
+namespace {
+#ifndef NDEBUG
+  // -debug - Command line option to enable the DEBUG statements in the passes.
+  // This flag may only be enabled in debug builds.
+  static cl::opt<bool, true>
+  Debug("debug", cl::desc("Enable debug output"), cl::Hidden,
+        cl::location(DebugFlag));
+
+  static std::string CurrentDebugType;
+  static struct DebugOnlyOpt {
+    void operator=(const std::string &Val) const {
+      DebugFlag |= !Val.empty();
+      CurrentDebugType = Val;
+    }
+  } DebugOnlyOptLoc;
+
+  static cl::opt<DebugOnlyOpt, true, cl::parser<std::string> >
+  DebugOnly("debug-only", cl::desc("Enable a specific type of debug output"),
+            cl::Hidden, cl::value_desc("debug string"),
+            cl::location(DebugOnlyOptLoc), cl::ValueRequired);
+#endif
+}
+
+// isCurrentDebugType - Return true if the specified string is the debug type
+// specified on the command line, or if none was specified on the command line
+// with the -debug-only=X option.
+//
+bool llvm::isCurrentDebugType(const char *DebugType) {
+#ifndef NDEBUG
+  return CurrentDebugType.empty() || DebugType == CurrentDebugType;
+#else
+  return false;
+#endif
+}
+
+// getErrorOutputStream - Returns the error output stream (std::cerr). This
+// places the std::c* I/O streams into one .cpp file and relieves the whole
+// program from having to have hundreds of static c'tor/d'tors for them.
+// 
+OStream &llvm::getErrorOutputStream(const char *DebugType) {
+  static OStream cnoout(0);
+  if (DebugFlag && isCurrentDebugType(DebugType))
+    return cerr;
+  else
+    return cnoout;
+}