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102 lines
3.9 KiB
C++
102 lines
3.9 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 is distributed under the University of Illinois Open Source
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// 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 handy 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 without assertions, the -debug-* options and all code in
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// DEBUG() 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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namespace llvm {
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class raw_ostream;
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/// DEBUG_TYPE macro - Files can specify a DEBUG_TYPE as a string, which causes
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/// all of their DEBUG statements to be activatable with -debug-only=thatstring.
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#ifndef DEBUG_TYPE
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#define DEBUG_TYPE ""
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#endif
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#ifndef NDEBUG
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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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/// SetCurrentDebugType - Set the current debug type, as if the -debug-only=X
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/// option were specified. Note that DebugFlag also needs to be set to true for
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/// debug output to be produced.
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///
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void SetCurrentDebugType(const char *Type);
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/// DEBUG_WITH_TYPE macro - This macro should be used by passes to emit debug
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/// information. In the '-debug' option is specified on the commandline, and if
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/// this is a debug build, then the code specified as the option to the macro
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/// will be executed. Otherwise it will not be. Example:
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///
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/// DEBUG_WITH_TYPE("bitset", dbgs() << "Bitset contains: " << Bitset << "\n");
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///
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/// This will emit the debug information if -debug is present, and -debug-only
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/// is not specified, or is specified as "bitset".
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#define DEBUG_WITH_TYPE(TYPE, X) \
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do { if (::llvm::DebugFlag && ::llvm::isCurrentDebugType(TYPE)) { X; } \
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} while (0)
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#else
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#define isCurrentDebugType(X) (false)
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#define SetCurrentDebugType(X)
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#define DEBUG_WITH_TYPE(TYPE, X) do { } while (0)
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#endif
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/// EnableDebugBuffering - This defaults to false. If true, the debug
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/// stream will install signal handlers to dump any buffered debug
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/// output. It allows clients to selectively allow the debug stream
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/// to install signal handlers if they are certain there will be no
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/// conflict.
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///
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extern bool EnableDebugBuffering;
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/// dbgs() - This returns a reference to a raw_ostream for debugging
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/// messages. If debugging is disabled it returns errs(). Use it
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/// like: dbgs() << "foo" << "bar";
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raw_ostream &dbgs();
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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(dbgs() << "Bitset contains: " << Bitset << "\n");
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//
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#define DEBUG(X) DEBUG_WITH_TYPE(DEBUG_TYPE, X)
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} // End llvm namespace
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#endif
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