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/*
  Copyright (C) 2008, 2009, 2010 Jiri Olsa <olsajiri@gmail.com>

  This file is part of the latrace.

  The latrace is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.

  The latrace 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 General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with the latrace (file COPYING).  If not, see 
  <http://www.gnu.org/licenses/>.
*/


#include <link.h>
#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <bits/wordsize.h>
#include <gnu/lib-names.h>
#include <stdlib.h>

#include "config.h"


extern struct lt_config_audit cfg;

__thread int pipe_fd = 0;
static __thread int flow_below_stack = 0;
static __thread int indent_depth = 0;


static int check_names(char *name, char **ptr)
{
	char *n;

	for(n = *ptr; n; n = *(++ptr)) {
		if ((n[0] == '*' && strstr(name, n + 1)) ||
		    strcmp(name, n) == 0) {
			PRINT_VERBOSE(&cfg, 2,
				"return %d for name %s\n", 1, name);
			return 1;
		}
	}

	PRINT_VERBOSE(&cfg, 2, "return %d for name %s\n",
			0, name);
	return 0;
}

static int check_flow_below(const char *symname, int in)
{
	int ret = flow_below_stack;

	if (check_names((char*) symname, cfg.flow_below))
		in ? ret = ++flow_below_stack : flow_below_stack--;

	return ret;
}

static void free_argbuf(int argret, char *argbuf, char *argdbuf)
{
	if (argret)
		return;

	free(argbuf);
	if (lt_sh(&cfg, args_detailed) && (*argdbuf))
		free(argdbuf);
}

static int sym_entry(const char *symname, void *ptr,
		     struct link_map *lr, struct link_map *ld,
		     La_regs *regs)
{
	char *lib_to = ld ? ld->l_name : NULL;
	int   argret = -1;
	char *argbuf = "", *argdbuf = "";
	struct timeval tv;
	struct lt_symbol *sym = NULL;

	PRINT_VERBOSE(&cfg, 2, "%s@%s\n", symname, lib_to);

	if (cfg.flow_below_cnt && !check_flow_below(symname, 1))
		return 0;

	if (lt_sh(&cfg, timestamp) || lt_sh(&cfg, counts))
		gettimeofday(&tv, NULL);

	if (lt_sh(&cfg, global_symbols))
		sym = lt_symbol_get(&cfg, ptr, symname);

#ifdef CONFIG_ARCH_HAVE_ARGS
	argret = lt_sh(&cfg, args_enabled) ?
		lt_args_sym_entry(cfg.sh, sym, regs, &argbuf, &argdbuf) : -1;
#endif

	if (lt_sh(&cfg, pipe)) {
		char buf[LT_FIFO_MSG_MAXLEN];
		int len;

		if (!pipe_fd)
			pipe_fd = lt_fifo_create(cfg.sh, cfg.dir);

		len = lt_fifo_msym_get(cfg.sh, buf, LT_FIFO_MTYPE_ENTRY, &tv,
				(char*) symname, lib_to, argbuf, argdbuf, 0);

		free_argbuf(argret, argbuf, argdbuf);
		return lt_fifo_send(cfg.sh, pipe_fd, buf, len);
	}

	indent_depth++;

	lt_out_entry(cfg.sh, &tv, syscall(SYS_gettid),
			indent_depth,
			symname, lib_to,
			argbuf, argdbuf);

	free_argbuf(argret, argbuf, argdbuf);
	return 0;
}

static int sym_exit(const char *symname, void *ptr,
		    struct link_map *lr, struct link_map *ld,
		    const La_regs *inregs, La_retval *outregs)
{
	char *lib_from = lr ? lr->l_name : NULL;
	char *lib_to   = ld ? ld->l_name : NULL;
	int   argret = -1;
	char *argbuf = "", *argdbuf = "";
	struct timeval tv;
	struct lt_symbol *sym = NULL;
	long info = -1;

	PRINT_VERBOSE(&cfg, 2, "%s@%s\n", symname, lib_to);

	if (cfg.flow_below_cnt && !check_flow_below(symname, 0))
		return 0;

	if (lt_sh(&cfg, timestamp) || lt_sh(&cfg, counts))
		gettimeofday(&tv, NULL);

	if (lt_sh(&cfg, global_symbols))
		sym = lt_symbol_get(&cfg, ptr, symname);

#ifdef CONFIG_ARCH_HAVE_ERROR_SIM
	if (lt_sh(&cfg, error_sim))
		lt_error_sym_exit(&cfg, symname, sym, &tv, lr, inregs, outregs, &info);
#endif

#ifdef CONFIG_ARCH_HAVE_ARGS
	argret = lt_sh(&cfg, args_enabled) ?
		lt_args_sym_exit(cfg.sh, sym,
			(La_regs*) inregs, outregs, &argbuf, &argdbuf) : -1;
#endif

	if (lt_sh(&cfg, pipe)) {
		char buf[LT_FIFO_MSG_MAXLEN];
		int len;

		len = lt_fifo_msym_get(cfg.sh, buf, LT_FIFO_MTYPE_EXIT, &tv,
				(char*) symname, lib_to, argbuf, argdbuf, info);

		free_argbuf(argret, argbuf, argdbuf);
		return lt_fifo_send(cfg.sh, pipe_fd, buf, len);
	}