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//===- llvm/Support/Debug.h - Easy way to add debug output ------*- C++ -*-===//

//

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.

// See https://llvm.org/LICENSE.txt for license information.

// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception

//

//===----------------------------------------------------------------------===//

//

// 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 LLVM_DEBUG() macro, and it will

// be enabled automatically if you specify '-debug' on the command-line.

// LLVM_DEBUG() requires the DEBUG_TYPE macro to be defined. Set it to "foo"

// specify that your debug code belongs to class "foo". Be careful that you only

// do this after including Debug.h and not around any #include of headers.

// Headers should define and undef the macro acround the code that needs to use

// the LLVM_DEBUG() macro. 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

// LLVM_DEBUG() statements disappears, so it does not affect the runtime of the

// code.

//

//===----------------------------------------------------------------------===//

#ifndef LLVM_SUPPORT_DEBUG_H

#define LLVM_SUPPORT_DEBUG_H

namespace llvm {

class raw_ostream;

#ifndef NDEBUG

/// 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);

/// setCurrentDebugTypes - Set the current debug type, as if the

/// -debug-only=X,Y,Z option were specified. Note that DebugFlag

/// also needs to be set to true for debug output to be produced.

///

void setCurrentDebugTypes(const char **Types, unsigned Count);

/// 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", dbgs() << "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 (::llvm::DebugFlag && ::llvm::isCurrentDebugType(TYPE)) { X; } \

  } while (false)

#else

#define isCurrentDebugType(X) (false)

#define setCurrentDebugType(X) do { (void)(X); } while (false)

#define setCurrentDebugTypes(X, N) do { (void)(X); (void)(N); } while (false)

#define DEBUG_WITH_TYPE(TYPE, X) do { } while (false)

#endif

/// 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;

/// EnableDebugBuffering - This defaults to false.  If true, the debug

/// stream will install signal handlers to dump any buffered debug

/// output.  It allows clients to selectively allow the debug stream

/// to install signal handlers if they are certain there will be no

/// conflict.

///

extern bool EnableDebugBuffering;

/// dbgs() - This returns a reference to a raw_ostream for debugging

/// messages.  If debugging is disabled it returns errs().  Use it

/// like: dbgs() << "foo" << "bar";

raw_ostream &dbgs();

// 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:

//

// LLVM_DEBUG(dbgs() << "Bitset contains: " << Bitset << "\n");

//

#define LLVM_DEBUG(X) DEBUG_WITH_TYPE(DEBUG_TYPE, X)

} // end namespace llvm

#endif // LLVM_SUPPORT_DEBUG_H