llvm-6502/include/llvm/Support/Debug.h
Chris Lattner 70197a3a04 add a new 'SetCurrentDebugType' API (requested by Andrew Haley for JIT
stuff) to programmatically control the current debug flavor.  While 
I'm at it, doxygenate Debug.h and clean it up.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85395 91177308-0d34-0410-b5e6-96231b3b80d8
2009-10-28 15:32:19 +00:00

86 lines
3.3 KiB
C++

//===- llvm/Support/Debug.h - Easy way to add debug output ------*- C++ -*-===//
//
// 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 handy 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 without assertions, the -debug-* options and all code in
// DEBUG() statements disappears, so it does not effect the runtime of the code.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_DEBUG_H
#define LLVM_SUPPORT_DEBUG_H
namespace llvm {
/// DEBUG_TYPE macro - Files can specify a DEBUG_TYPE as a string, which causes
/// all of their DEBUG statements to be activatable with -debug-only=thatstring.
#ifndef DEBUG_TYPE
#define DEBUG_TYPE ""
#endif
#ifndef NDEBUG
/// DebugFlag - This boolean is set to true if the '-debug' command line option
/// is specified. This should probably not be referenced directly, instead, use
/// the DEBUG macro below.
///
extern bool DebugFlag;
/// 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 isCurrentDebugType(const char *Type);
/// SetCurrentDebugType - Set the current debug type, as if the -debug-only=X
/// option were specified. Note that DebugFlag also needs to be set to true for
/// debug output to be produced.
///
void SetCurrentDebugType(const char *Type);
/// DEBUG_WITH_TYPE macro - This macro should be used by passes to emit debug
/// information. In the '-debug' option is specified on the commandline, and if
/// this is a debug build, then the code specified as the option to the macro
/// will be executed. Otherwise it will not be. Example:
///
/// DEBUG_WITH_TYPE("bitset", errs() << "Bitset contains: " << Bitset << "\n");
///
/// This will emit the debug information if -debug is present, and -debug-only
/// is not specified, or is specified as "bitset".
#define DEBUG_WITH_TYPE(TYPE, X) \
do { if (DebugFlag && isCurrentDebugType(TYPE)) { X; } } while (0)
#else
#define isCurrentDebugType(X) (false)
#define SetCurrentDebugType(X)
#define DEBUG_WITH_TYPE(TYPE, X) do { } while (0)
#endif
// DEBUG macro - This macro should be used by passes to emit debug information.
// In the '-debug' option is specified on the commandline, and if this is a
// debug build, then the code specified as the option to the macro will be
// executed. Otherwise it will not be. Example:
//
// DEBUG(errs() << "Bitset contains: " << Bitset << "\n");
//
#define DEBUG(X) DEBUG_WITH_TYPE(DEBUG_TYPE, X)
} // End llvm namespace
#endif