* generic/tclCompile.h: add support for debug logging of DTrace

	* generic/tclBasic.c:		'proc', 'cmd' and 'inst' probes (does
					_not_ require a platform with DTrace).

1 files changed, 111 insertions, 2 deletions

diff --git a/generic/tclCompile.h b/generic/tclCompile.h
index ce82f8c..69b0c82 100644
--- a/generic/tclCompile.h
+++ b/generic/tclCompile.h
@@ -9,7 +9,7 @@
  * See the file "license.terms" for information on usage and redistribution
  * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
  *
- * RCS: @(#) $Id: tclCompile.h,v 1.33.2.5 2008/07/22 22:30:05 andreas_kupries Exp $
+ * RCS: @(#) $Id: tclCompile.h,v 1.33.2.6 2008/08/14 02:12:27 das Exp $
  */
 
 #ifndef _TCLCOMPILATION
@@ -1090,11 +1090,32 @@ EXTERN int		TclCompileVariableCmd _ANSI_ARGS_((
  * DTrace probe macros (NOPs if DTrace support is not enabled).
  */
 
+/*
+ * Define the following macros to enable debug logging of the DTrace proc,
+ * cmd, and inst probes. Note that this does _not_ require a platform with
+ * DTrace, it simply logs all probe output to /tmp/tclDTraceDebug-[pid].log.
+ *
+ * If the second macro is defined, logging to file starts immediately,
+ * otherwise only after the first call to [tcl::dtrace]. Note that the debug
+ * probe data is always computed, even when it is not logged to file.
+ * 
+ * Defining the third macro enables debug logging of inst probes (disabled
+ * by default due to the significant performance impact).
+ */
+
+/*
+#define TCL_DTRACE_DEBUG 1
+#define TCL_DTRACE_DEBUG_LOG_ENABLED 1
+#define TCL_DTRACE_DEBUG_INST_PROBES 1
+*/
+
+#if !(defined(TCL_DTRACE_DEBUG) && defined(__GNUC__))
+
 #ifdef USE_DTRACE
 
 #include "tclDTrace.h"
 
-#if defined(__GNUC__ ) && __GNUC__ > 2
+#if defined(__GNUC__) && __GNUC__ > 2
 /* Use gcc branch prediction hint to minimize cost of DTrace ENABLED checks. */
 #define unlikely(x) (__builtin_expect((x), 0))
 #else
@@ -1130,6 +1151,8 @@ EXTERN int		TclCompileVariableCmd _ANSI_ARGS_((
 #define TCL_DTRACE_TCL_PROBE(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9) \
 	TCL_TCL_PROBE(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9)
 
+#define TCL_DTRACE_DEBUG_LOG()
+
 #else /* USE_DTRACE */
 
 #define TCL_DTRACE_PROC_ENTRY_ENABLED()	    0
@@ -1160,6 +1183,92 @@ EXTERN int		TclCompileVariableCmd _ANSI_ARGS_((
 
 #endif /* USE_DTRACE */
 
+#else /* TCL_DTRACE_DEBUG */
+
+#define USE_DTRACE 1
+
+#if !defined(TCL_DTRACE_DEBUG_LOG_ENABLED) || !(TCL_DTRACE_DEBUG_LOG_ENABLED)
+#undef TCL_DTRACE_DEBUG_LOG_ENABLED
+#define TCL_DTRACE_DEBUG_LOG_ENABLED 0
+#endif
+
+#if !defined(TCL_DTRACE_DEBUG_INST_PROBES) || !(TCL_DTRACE_DEBUG_INST_PROBES)
+#undef TCL_DTRACE_DEBUG_INST_PROBES
+#define TCL_DTRACE_DEBUG_INST_PROBES 0
+#endif
+
+MODULE_SCOPE int tclDTraceDebugEnabled, tclDTraceDebugIndent;
+MODULE_SCOPE FILE *tclDTraceDebugLog;
+MODULE_SCOPE void TclDTraceOpenDebugLog(void);
+MODULE_SCOPE void TclDTraceInfo(Tcl_Obj *info, char **args, int *argsi);
+
+#define TCL_DTRACE_DEBUG_LOG() \
+	int tclDTraceDebugEnabled = TCL_DTRACE_DEBUG_LOG_ENABLED;\
+	int tclDTraceDebugIndent = 0; \
+	FILE *tclDTraceDebugLog = NULL; \
+	void TclDTraceOpenDebugLog(void) { char n[35]; \
+	sprintf(n, "/tmp/tclDTraceDebug-%lu.log", (unsigned long) getpid()); \
+	tclDTraceDebugLog = fopen(n, "a"); } \
+
+#define TclDTraceDbgMsg(p, m, ...) do { if (tclDTraceDebugEnabled) { \
+	int _l, _t = 0; if (!tclDTraceDebugLog) { TclDTraceOpenDebugLog(); } \
+	fprintf(tclDTraceDebugLog, "%.12s:%.4d:%n", strrchr(__FILE__, '/') + \
+		1, __LINE__, &_l); _t += _l; \
+	fprintf(tclDTraceDebugLog, " %.*s():%n", (_t < 18 ? 18 - _t : 0) + \
+		18, __func__, &_l); _t += _l; \
+	fprintf(tclDTraceDebugLog, "%*s" p "%n", (_t < 40 ? 40 - _t : 0) + \
+		2 * tclDTraceDebugIndent, "", &_l); _t += _l; \
+	fprintf(tclDTraceDebugLog, "%*s" m "\n", (_t < 64 ? 64 - _t : 1), "", \
+		##__VA_ARGS__); fflush(tclDTraceDebugLog); \
+	} } while (0)
+
+#define TCL_DTRACE_PROC_ENTRY_ENABLED()	    1
+#define TCL_DTRACE_PROC_RETURN_ENABLED()    1
+#define TCL_DTRACE_PROC_RESULT_ENABLED()    1
+#define TCL_DTRACE_PROC_ARGS_ENABLED()	    1
+#define TCL_DTRACE_PROC_ENTRY(a0, a1, a2) \
+	tclDTraceDebugIndent++; \
+	TclDTraceDbgMsg("-> proc-entry", "%s %d %p", a0, a1, a2)
+#define TCL_DTRACE_PROC_RETURN(a0, a1) \
+	TclDTraceDbgMsg("<- proc-return", "%s %d", a0, a1); \
+	tclDTraceDebugIndent--
+#define TCL_DTRACE_PROC_RESULT(a0, a1, a2, a3) \
+	TclDTraceDbgMsg(" | proc-result", "%s %d %s %p", a0, a1, a2, a3)
+#define TCL_DTRACE_PROC_ARGS(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9) \
+	TclDTraceDbgMsg(" | proc-args", "%s %s %s %s %s %s %s %s %s %s", a0, \
+		a1, a2, a3, a4, a5, a6, a7, a8, a9)
+
+#define TCL_DTRACE_CMD_ENTRY_ENABLED()	    1
+#define TCL_DTRACE_CMD_RETURN_ENABLED()	    1
+#define TCL_DTRACE_CMD_RESULT_ENABLED()	    1
+#define TCL_DTRACE_CMD_ARGS_ENABLED()	    1
+#define TCL_DTRACE_CMD_ENTRY(a0, a1, a2) \
+	tclDTraceDebugIndent++; \
+	TclDTraceDbgMsg("-> cmd-entry", "%s %d %p", a0, a1, a2)
+#define TCL_DTRACE_CMD_RETURN(a0, a1) \
+	TclDTraceDbgMsg("<- cmd-return", "%s %d", a0, a1); \
+	tclDTraceDebugIndent--
+#define TCL_DTRACE_CMD_RESULT(a0, a1, a2, a3) \
+	TclDTraceDbgMsg(" | cmd-result", "%s %d %s %p", a0, a1, a2, a3)
+#define TCL_DTRACE_CMD_ARGS(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9) \
+	TclDTraceDbgMsg(" | cmd-args", "%s %s %s %s %s %s %s %s %s %s", a0, \
+		a1, a2, a3, a4, a5, a6, a7, a8, a9)
+
+#define TCL_DTRACE_INST_START_ENABLED()	    TCL_DTRACE_DEBUG_INST_PROBES
+#define TCL_DTRACE_INST_DONE_ENABLED()	    TCL_DTRACE_DEBUG_INST_PROBES
+#define TCL_DTRACE_INST_START(a0, a1, a2) \
+	TclDTraceDbgMsg(" | inst-start", "%s %d %p", a0, a1, a2)
+#define TCL_DTRACE_INST_DONE(a0, a1, a2) \
+	TclDTraceDbgMsg(" | inst-end", "%s %d %p", a0, a1, a2)
+
+#define TCL_DTRACE_TCL_PROBE_ENABLED()	    1
+#define TCL_DTRACE_TCL_PROBE(a0, a1, a2, a3, a4, a5, a6, a7, a8, a9) \
+	tclDTraceDebugEnabled = 1; \
+	TclDTraceDbgMsg(" | tcl-probe", "%s %s %s %s %s %s %s %s %s %s", a0, \
+		a1, a2, a3, a4, a5, a6, a7, a8, a9)
+
+#endif /* TCL_DTRACE_DEBUG */
+
 # undef TCL_STORAGE_CLASS
 # define TCL_STORAGE_CLASS DLLIMPORT