llvm-6502/lib/Support/Debug.cpp
Chandler Carruth d04a8d4b33 Use the new script to sort the includes of every file under lib.
Sooooo many of these had incorrect or strange main module includes.
I have manually inspected all of these, and fixed the main module
include to be the nearest plausible thing I could find. If you own or
care about any of these source files, I encourage you to take some time
and check that these edits were sensible. I can't have broken anything
(I strictly added headers, and reordered them, never removed), but they
may not be the headers you'd really like to identify as containing the
API being implemented.

Many forward declarations and missing includes were added to a header
files to allow them to parse cleanly when included first. The main
module rule does in fact have its merits. =]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169131 91177308-0d34-0410-b5e6-96231b3b80d8
2012-12-03 16:50:05 +00:00

135 lines
4.6 KiB
C++

//===-- Debug.cpp - An easy way to add debug output to your code ----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// 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 DEBUG() macro, and it will be
// enabled automatically if you specify '-debug' on the command-line.
// Alternatively, you can also use the SET_DEBUG_TYPE("foo") macro to specify
// that your debug code belongs to class "foo". 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
// DEBUG() statements disappears, so it does not affect the runtime of the code.
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/Debug.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Signals.h"
#include "llvm/Support/circular_raw_ostream.h"
using namespace llvm;
// All Debug.h functionality is a no-op in NDEBUG mode.
#ifndef NDEBUG
bool llvm::DebugFlag; // DebugFlag - Exported boolean set by the -debug option
// -debug - Command line option to enable the DEBUG statements in the passes.
// This flag may only be enabled in debug builds.
static cl::opt<bool, true>
Debug("debug", cl::desc("Enable debug output"), cl::Hidden,
cl::location(DebugFlag));
// -debug-buffer-size - Buffer the last N characters of debug output
//until program termination.
static cl::opt<unsigned>
DebugBufferSize("debug-buffer-size",
cl::desc("Buffer the last N characters of debug output"
"until program termination. "
"[default 0 -- immediate print-out]"),
cl::Hidden,
cl::init(0));
static std::string CurrentDebugType;
namespace {
struct DebugOnlyOpt {
void operator=(const std::string &Val) const {
DebugFlag |= !Val.empty();
CurrentDebugType = Val;
}
};
}
static DebugOnlyOpt DebugOnlyOptLoc;
static cl::opt<DebugOnlyOpt, true, cl::parser<std::string> >
DebugOnly("debug-only", cl::desc("Enable a specific type of debug output"),
cl::Hidden, cl::value_desc("debug string"),
cl::location(DebugOnlyOptLoc), cl::ValueRequired);
// Signal handlers - dump debug output on termination.
static void debug_user_sig_handler(void *Cookie) {
// This is a bit sneaky. Since this is under #ifndef NDEBUG, we
// know that debug mode is enabled and dbgs() really is a
// circular_raw_ostream. If NDEBUG is defined, then dbgs() ==
// errs() but this will never be invoked.
llvm::circular_raw_ostream *dbgout =
static_cast<llvm::circular_raw_ostream *>(&llvm::dbgs());
dbgout->flushBufferWithBanner();
}
// 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 llvm::isCurrentDebugType(const char *DebugType) {
return CurrentDebugType.empty() || DebugType == CurrentDebugType;
}
/// 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 llvm::setCurrentDebugType(const char *Type) {
CurrentDebugType = Type;
}
/// dbgs - Return a circular-buffered debug stream.
raw_ostream &llvm::dbgs() {
// Do one-time initialization in a thread-safe way.
static struct dbgstream {
circular_raw_ostream strm;
dbgstream() :
strm(errs(), "*** Debug Log Output ***\n",
(!EnableDebugBuffering || !DebugFlag) ? 0 : DebugBufferSize) {
if (EnableDebugBuffering && DebugFlag && DebugBufferSize != 0)
// TODO: Add a handler for SIGUSER1-type signals so the user can
// force a debug dump.
sys::AddSignalHandler(&debug_user_sig_handler, 0);
// Otherwise we've already set the debug stream buffer size to
// zero, disabling buffering so it will output directly to errs().
}
} thestrm;
return thestrm.strm;
}
#else
// Avoid "has no symbols" warning.
namespace llvm {
/// dbgs - Return errs().
raw_ostream &dbgs() {
return errs();
}
}
#endif
/// EnableDebugBuffering - Turn on signal handler installation.
///
bool llvm::EnableDebugBuffering = false;