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e81561909d
now cerr, cout, and NullStream resp. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32298 91177308-0d34-0410-b5e6-96231b3b80d8
79 lines
2.7 KiB
C++
79 lines
2.7 KiB
C++
//===- llvm/Support/Debug.h - Easy way to add debug output ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a handle way of adding debugging information to your
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// code, without it being enabled all of the time, and without having to add
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// command line options to enable it.
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//
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// In particular, just wrap your code with the DEBUG() macro, and it will be
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// enabled automatically if you specify '-debug' on the command-line.
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// Alternatively, you can also use the SET_DEBUG_TYPE("foo") macro to specify
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// that your debug code belongs to class "foo". Then, on the command line, you
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// can specify '-debug-only=foo' to enable JUST the debug information for the
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// foo class.
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//
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// When compiling in release mode, the -debug-* options and all code in DEBUG()
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// statements disappears, so it does not effect the runtime of the code.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_DEBUG_H
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#define LLVM_SUPPORT_DEBUG_H
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#include "llvm/Support/Streams.h"
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namespace llvm {
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// DebugFlag - This boolean is set to true if the '-debug' command line option
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// is specified. This should probably not be referenced directly, instead, use
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// the DEBUG macro below.
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//
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extern bool DebugFlag;
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// isCurrentDebugType - Return true if the specified string is the debug type
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// specified on the command line, or if none was specified on the command line
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// with the -debug-only=X option.
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//
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bool isCurrentDebugType(const char *Type);
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// DEBUG macro - This macro should be used by passes to emit debug information.
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// In the '-debug' option is specified on the commandline, and if this is a
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// debug build, then the code specified as the option to the macro will be
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// executed. Otherwise it will not be. Example:
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//
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// DEBUG(cerr << "Bitset contains: " << Bitset << "\n");
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//
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#ifndef DEBUG_TYPE
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#define DEBUG_TYPE ""
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#endif
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#ifdef NDEBUG
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#define DEBUG(X)
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#else
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#define DEBUG(X) \
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do { if (DebugFlag && isCurrentDebugType(DEBUG_TYPE)) { X; } } while (0)
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#endif
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/// getErrorOutputStream - Returns the error output stream (std::cerr). This
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/// places the std::c* I/O streams into one .cpp file and relieves the whole
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/// program from having to have hundreds of static c'tor/d'tors for them.
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///
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OStream getErrorOutputStream(const char *DebugType);
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#ifdef NDEBUG
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#define DOUT NullStream
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#else
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#define DOUT getErrorOutputStream(DEBUG_TYPE)
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#endif
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} // End llvm namespace
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#endif
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