/* * Copyright (C) 2009, 2010 Red Hat Inc, Steven Rostedt <srostedt@redhat.com> * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License (not later!) * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the * GNU Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this program; if not,  see <http://www.gnu.org/licenses> * * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */#include <stdio.h>#include <stdlib.h>#include <string.h> #include "event-parse.h"#include "event-utils.h" static struct func_stack {	int size;	char **stack;} *fstack; static int cpus = -1; #define STK_BLK 10 struct pevent_plugin_option plugin_options[] ={	{		.name = "parent",		.plugin_alias = "ftrace",		.description =		"Print parent of functions for function events",	},	{		.name = "indent",		.plugin_alias = "ftrace",		.description =		"Try to show function call indents, based on parents",		.set = 1,	},	{		.name = NULL,	}}; static struct pevent_plugin_option *ftrace_parent = &plugin_options[0];static struct pevent_plugin_option *ftrace_indent = &plugin_options[1]; static void add_child(struct func_stack *stack, const char *child, int pos){	int i; 	if (!child)		return; 	if (pos < stack->size)		free(stack->stack[pos]);	else {		char **ptr; 		ptr = realloc(stack->stack, sizeof(char *) *			      (stack->size + STK_BLK));		if (!ptr) {			warning("could not allocate plugin memory\n");			return;		} 		stack->stack = ptr; 		for (i = stack->size; i < stack->size + STK_BLK; i++)			stack->stack[i] = NULL;		stack->size += STK_BLK;	} 	stack->stack[pos] = strdup(child);} static int add_and_get_index(const char *parent, const char *child, int cpu){	int i; 	if (cpu < 0)		return 0; 	if (cpu > cpus) {		struct func_stack *ptr; 		ptr = realloc(fstack, sizeof(*fstack) * (cpu + 1));		if (!ptr) {			warning("could not allocate plugin memory\n");			return 0;		} 		fstack = ptr; 		/* Account for holes in the cpu count */		for (i = cpus + 1; i <= cpu; i++)			memset(&fstack[i], 0, sizeof(fstack[i]));		cpus = cpu;	} 	for (i = 0; i < fstack[cpu].size && fstack[cpu].stack[i]; i++) {		if (strcmp(parent, fstack[cpu].stack[i]) == 0) {			add_child(&fstack[cpu], child, i+1);			return i;		}	} 	/* Not found */	add_child(&fstack[cpu], parent, 0);	add_child(&fstack[cpu], child, 1);	return 0;} static int function_handler(struct trace_seq *s, struct pevent_record *record,			    struct event_format *event, void *context){	struct pevent *pevent = event->pevent;	unsigned long long function;	unsigned long long pfunction;	const char *func;	const char *parent;	int index = 0; 	if (pevent_get_field_val(s, event, "ip", record, &function, 1))		return trace_seq_putc(s, '!'); 	func = pevent_find_function(pevent, function); 	if (pevent_get_field_val(s, event, "parent_ip", record, &pfunction, 1))		return trace_seq_putc(s, '!'); 	parent = pevent_find_function(pevent, pfunction); 	if (parent && ftrace_indent->set)		index = add_and_get_index(parent, func, record->cpu); 	trace_seq_printf(s, "%*s", index*3, ""); 	if (func)		trace_seq_printf(s, "%s", func);	else		trace_seq_printf(s, "0x%llx", function); 	if (ftrace_parent->set) {		trace_seq_printf(s, " <-- ");		if (parent)			trace_seq_printf(s, "%s", parent);		else			trace_seq_printf(s, "0x%llx", pfunction);	} 	return 0;} int PEVENT_PLUGIN_LOADER(struct pevent *pevent){	pevent_register_event_handler(pevent, -1, "ftrace", "function",				      function_handler, NULL); 	traceevent_plugin_add_options("ftrace", plugin_options); 	return 0;} void PEVENT_PLUGIN_UNLOADER(struct pevent *pevent){	int i, x; 	pevent_unregister_event_handler(pevent, -1, "ftrace", "function",					function_handler, NULL); 	for (i = 0; i <= cpus; i++) {		for (x = 0; x < fstack[i].size && fstack[i].stack[x]; x++)			free(fstack[i].stack[x]);		free(fstack[i].stack);	} 	traceevent_plugin_remove_options(plugin_options); 	free(fstack);	fstack = NULL;	cpus = -1;}