1 files changed, 284 insertions, 0 deletions
diff --git a/tools/perf/util/debug.c b/tools/perf/util/debug.c
new file mode 100644
index 000000000..3d6459626
--- /dev/null
+++ b/tools/perf/util/debug.c
@@ -0,0 +1,284 @@
+// SPDX-License-Identifier: GPL-2.0
+/* For general debugging purposes */
+
+#include "../perf.h"
+
+#include <inttypes.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <sys/wait.h>
+#include <api/debug.h>
+#include <linux/time64.h>
+#ifdef HAVE_BACKTRACE_SUPPORT
+#include <execinfo.h>
+#endif
+#include "cache.h"
+#include "color.h"
+#include "event.h"
+#include "debug.h"
+#include "print_binary.h"
+#include "util.h"
+#include "target.h"
+
+#include "sane_ctype.h"
+
+int verbose;
+bool dump_trace = false, quiet = false;
+int debug_ordered_events;
+static int redirect_to_stderr;
+int debug_data_convert;
+
+int veprintf(int level, int var, const char *fmt, va_list args)
+{
+	int ret = 0;
+
+	if (var >= level) {
+		if (use_browser >= 1 && !redirect_to_stderr)
+			ui_helpline__vshow(fmt, args);
+		else
+			ret = vfprintf(stderr, fmt, args);
+	}
+
+	return ret;
+}
+
+int eprintf(int level, int var, const char *fmt, ...)
+{
+	va_list args;
+	int ret;
+
+	va_start(args, fmt);
+	ret = veprintf(level, var, fmt, args);
+	va_end(args);
+
+	return ret;
+}
+
+static int veprintf_time(u64 t, const char *fmt, va_list args)
+{
+	int ret = 0;
+	u64 secs, usecs, nsecs = t;
+
+	secs   = nsecs / NSEC_PER_SEC;
+	nsecs -= secs  * NSEC_PER_SEC;
+	usecs  = nsecs / NSEC_PER_USEC;
+
+	ret = fprintf(stderr, "[%13" PRIu64 ".%06" PRIu64 "] ",
+		      secs, usecs);
+	ret += vfprintf(stderr, fmt, args);
+	return ret;
+}
+
+int eprintf_time(int level, int var, u64 t, const char *fmt, ...)
+{
+	int ret = 0;
+	va_list args;
+
+	if (var >= level) {
+		va_start(args, fmt);
+		ret = veprintf_time(t, fmt, args);
+		va_end(args);
+	}
+
+	return ret;
+}
+
+/*
+ * Overloading libtraceevent standard info print
+ * function, display with -v in perf.
+ */
+void pr_stat(const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	veprintf(1, verbose, fmt, args);
+	va_end(args);
+	eprintf(1, verbose, "\n");
+}
+
+int dump_printf(const char *fmt, ...)
+{
+	va_list args;
+	int ret = 0;
+
+	if (dump_trace) {
+		va_start(args, fmt);
+		ret = vprintf(fmt, args);
+		va_end(args);
+	}
+
+	return ret;
+}
+
+static int trace_event_printer(enum binary_printer_ops op,
+			       unsigned int val, void *extra, FILE *fp)
+{
+	const char *color = PERF_COLOR_BLUE;
+	union perf_event *event = (union perf_event *)extra;
+	unsigned char ch = (unsigned char)val;
+	int printed = 0;
+
+	switch (op) {
+	case BINARY_PRINT_DATA_BEGIN:
+		printed += fprintf(fp, ".");
+		printed += color_fprintf(fp, color, "\n. ... raw event: size %d bytes\n",
+					 event->header.size);
+		break;
+	case BINARY_PRINT_LINE_BEGIN:
+		printed += fprintf(fp, ".");
+		break;
+	case BINARY_PRINT_ADDR:
+		printed += color_fprintf(fp, color, "  %04x: ", val);
+		break;
+	case BINARY_PRINT_NUM_DATA:
+		printed += color_fprintf(fp, color, " %02x", val);
+		break;
+	case BINARY_PRINT_NUM_PAD:
+		printed += color_fprintf(fp, color, "   ");
+		break;
+	case BINARY_PRINT_SEP:
+		printed += color_fprintf(fp, color, "  ");
+		break;
+	case BINARY_PRINT_CHAR_DATA:
+		printed += color_fprintf(fp, color, "%c",
+			      isprint(ch) ? ch : '.');
+		break;
+	case BINARY_PRINT_CHAR_PAD:
+		printed += color_fprintf(fp, color, " ");
+		break;
+	case BINARY_PRINT_LINE_END:
+		printed += color_fprintf(fp, color, "\n");
+		break;
+	case BINARY_PRINT_DATA_END:
+		printed += fprintf(fp, "\n");
+		break;
+	default:
+		break;
+	}
+
+	return printed;
+}
+
+void trace_event(union perf_event *event)
+{
+	unsigned char *raw_event = (void *)event;
+
+	if (!dump_trace)
+		return;
+
+	print_binary(raw_event, event->header.size, 16,
+		     trace_event_printer, event);
+}
+
+static struct debug_variable {
+	const char *name;
+	int *ptr;
+} debug_variables[] = {
+	{ .name = "verbose",		.ptr = &verbose },
+	{ .name = "ordered-events",	.ptr = &debug_ordered_events},
+	{ .name = "stderr",		.ptr = &redirect_to_stderr},
+	{ .name = "data-convert",	.ptr = &debug_data_convert },
+	{ .name = NULL, }
+};
+
+int perf_debug_option(const char *str)
+{
+	struct debug_variable *var = &debug_variables[0];
+	char *vstr, *s = strdup(str);
+	int v = 1;
+
+	vstr = strchr(s, '=');
+	if (vstr)
+		*vstr++ = 0;
+
+	while (var->name) {
+		if (!strcmp(s, var->name))
+			break;
+		var++;
+	}
+
+	if (!var->name) {
+		pr_err("Unknown debug variable name '%s'\n", s);
+		free(s);
+		return -1;
+	}
+
+	if (vstr) {
+		v = atoi(vstr);
+		/*
+		 * Allow only values in range (0, 10),
+		 * otherwise set 0.
+		 */
+		v = (v < 0) || (v > 10) ? 0 : v;
+	}
+
+	if (quiet)
+		v = -1;
+
+	*var->ptr = v;
+	free(s);
+	return 0;
+}
+
+int perf_quiet_option(void)
+{
+	struct debug_variable *var = &debug_variables[0];
+
+	/* disable all debug messages */
+	while (var->name) {
+		*var->ptr = -1;
+		var++;
+	}
+
+	return 0;
+}
+
+#define DEBUG_WRAPPER(__n, __l)				\
+static int pr_ ## __n ## _wrapper(const char *fmt, ...)	\
+{							\
+	va_list args;					\
+	int ret;					\
+							\
+	va_start(args, fmt);				\
+	ret = veprintf(__l, verbose, fmt, args);	\
+	va_end(args);					\
+	return ret;					\
+}
+
+DEBUG_WRAPPER(warning, 0);
+DEBUG_WRAPPER(debug, 1);
+
+void perf_debug_setup(void)
+{
+	libapi_set_print(pr_warning_wrapper, pr_warning_wrapper, pr_debug_wrapper);
+}
+
+/* Obtain a backtrace and print it to stdout. */
+#ifdef HAVE_BACKTRACE_SUPPORT
+void dump_stack(void)
+{
+	void *array[16];
+	size_t size = backtrace(array, ARRAY_SIZE(array));
+	char **strings = backtrace_symbols(array, size);
+	size_t i;
+
+	printf("Obtained %zd stack frames.\n", size);
+
+	for (i = 0; i < size; i++)
+		printf("%s\n", strings[i]);
+
+	free(strings);
+}
+#else
+void dump_stack(void) {}
+#endif
+
+void sighandler_dump_stack(int sig)
+{
+	psignal(sig, "perf");
+	dump_stack();
+	signal(sig, SIG_DFL);
+	raise(sig);
+}