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Add DEBUG_WITH_TYPE as a clean alternative to tweaking DEBUG_TYPE.

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This:
--
#undef DEBUG_TYPE
#define DEBUG_TYPE "foo"
DEBUG(...)
#undef DEBUG_TYPE
#define DEBUG_TYPE ""
--
becomes this:
--
DEBUG_WITH_TYPE("foo", ...)
--


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78435 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2009-08-07 23:48:59 +00:00
parent e9ce5d5ef9
commit c3c9239d76
2 changed files with 34 additions and 7 deletions
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15
docs/ProgrammersManual.html
View File

@ -646,6 +646,21 @@ on when the name is specified. This allows, for example, all debug information
for instruction scheduling to be enabled with <tt>-debug-type=InstrSched</tt>,
even if the source lives in multiple files.</p>
<p>The <tt>DEBUG_WITH_TYPE</tt> macro is also available for situations where you
would like to set <tt>DEBUG_TYPE</tt>, but only for one specific <tt>DEBUG</tt>
statement. It takes an additional first parameter, which is the type to use. For
example, the preceeding example could be written as:</p>
<div class="doc_code">
<pre>
DEBUG_WITH_TYPE("", errs() &lt;&lt; "No debug type\n");
DEBUG_WITH_TYPE("foo", errs() &lt;&lt; "'foo' debug type\n");
DEBUG_WITH_TYPE("bar", errs() &lt;&lt; "'bar' debug type\n"));
DEBUG_WITH_TYPE("", errs() &lt;&lt; "No debug type (2)\n");
</pre>
</div>
</div>
<!-- ======================================================================= -->

26
include/llvm/Support/Debug.h
View File

@ -42,24 +42,36 @@ extern bool DebugFlag;
//
bool isCurrentDebugType(const char *Type);
// 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", errs() << "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".
#ifdef NDEBUG
#define DEBUG_WITH_TYPE(TYPE, X) do { } while (0)
#else
#define DEBUG_WITH_TYPE(TYPE, X) \
do { if (DebugFlag && isCurrentDebugType(TYPE)) { X; } } while (0)
#endif
// 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:
//
// DEBUG(cerr << "Bitset contains: " << Bitset << "\n");
// DEBUG(errs() << "Bitset contains: " << Bitset << "\n");
//
#ifndef DEBUG_TYPE
#define DEBUG_TYPE ""
#endif
#ifdef NDEBUG
#define DEBUG(X)
#else
#define DEBUG(X) \
do { if (DebugFlag && isCurrentDebugType(DEBUG_TYPE)) { X; } } while (0)
#endif
#define DEBUG(X) DEBUG_WITH_TYPE(DEBUG_TYPE, X)
/// getNullOutputStream - Return a null string that does not output
/// anything. This hides the static variable from other modules.