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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
127 lines
4.7 KiB
C++
127 lines
4.7 KiB
C++
//===- llvm/Support/Debug.h - Easy way to add debug output ------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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 LLVM_DEBUG() macro, and it will
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// be enabled automatically if you specify '-debug' on the command-line.
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// LLVM_DEBUG() requires the DEBUG_TYPE macro to be defined. Set it to "foo"
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// specify that your debug code belongs to class "foo". Be careful that you only
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// do this after including Debug.h and not around any #include of headers.
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// Headers should define and undef the macro acround the code that needs to use
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// the LLVM_DEBUG() macro. Then, on the command line, you can specify
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// '-debug-only=foo' to enable JUST the debug information for the 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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// LLVM_DEBUG() statements disappears, so it does not affect the runtime of the
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// 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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#ifndef NDEBUG
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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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/// setCurrentDebugTypes - Set the current debug type, as if the
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/// -debug-only=X,Y,Z option were specified. Note that DebugFlag
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/// also needs to be set to true for debug output to be produced.
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///
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void setCurrentDebugTypes(const char **Types, unsigned Count);
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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 (false)
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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 setCurrentDebugTypes(X, N)
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#define DEBUG_WITH_TYPE(TYPE, X) do { } while (false)
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#endif
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/// 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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/// \name Verification flags.
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///
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/// These flags turns on/off that are expensive and are turned off by default,
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/// unless macro EXPENSIVE_CHECKS is defined. The flags allow selectively
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/// turning the checks on without need to recompile.
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/// \{
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/// Enables verification of dominator trees.
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///
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extern bool VerifyDomInfo;
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/// Enables verification of loop info.
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///
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extern bool VerifyLoopInfo;
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/// Enables verification of MemorySSA.
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///
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extern bool VerifyMemorySSA;
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///\}
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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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// LLVM_DEBUG(dbgs() << "Bitset contains: " << Bitset << "\n");
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//
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#define LLVM_DEBUG(X) DEBUG_WITH_TYPE(DEBUG_TYPE, X)
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} // end namespace llvm
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#endif // LLVM_SUPPORT_DEBUG_H
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