1 //===-- Debug.cpp - An easy way to add debug output to your code ----------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file implements a handle way of adding debugging information to your
11 // code, without it being enabled all of the time, and without having to add
12 // command line options to enable it.
14 // In particular, just wrap your code with the DEBUG() macro, and it will be
15 // enabled automatically if you specify '-debug' on the command-line.
16 // Alternatively, you can also use the SET_DEBUG_TYPE("foo") macro to specify
17 // that your debug code belongs to class "foo". Then, on the command line, you
18 // can specify '-debug-only=foo' to enable JUST the debug information for the
21 // When compiling in release mode, the -debug-* options and all code in DEBUG()
22 // statements disappears, so it does not effect the runtime of the code.
24 //===----------------------------------------------------------------------===//
26 #include "Support/Statistic.h"
27 #include "Support/CommandLine.h"
29 bool DebugFlag; // DebugFlag - Exported boolean set by the -debug option
33 // -debug - Command line option to enable the DEBUG statements in the passes.
34 // This flag may only be enabled in debug builds.
36 Debug("debug", cl::desc("Enable debug output"), cl::Hidden,
37 cl::location(DebugFlag));
39 std::string CurrentDebugType;
41 void operator=(const std::string &Val) const {
42 DebugFlag |= !Val.empty();
43 CurrentDebugType = Val;
47 cl::opt<DebugOnlyOpt, true, cl::parser<std::string> >
48 DebugOnly("debug-only", cl::desc("Enable a specific type of debug output"),
49 cl::Hidden, cl::value_desc("debug string"),
50 cl::location(DebugOnlyOptLoc), cl::ValueRequired);
54 // isCurrentDebugType - Return true if the specified string is the debug type
55 // specified on the command line, or if none was specified on the command line
56 // with the -debug-only=X option.
58 bool isCurrentDebugType(const char *DebugType) {
60 return CurrentDebugType.empty() || DebugType == CurrentDebugType;