PR 9940. Rearchitected task_finder.c a bit.

PR 9940.  Rearchitected task_finder.c a bit.
2009-04-07  David Smith  <dsmith@redhat.com>

	PR 9940.
	* tapsets.cxx (emit_vma_callback_probe_decl): Initialized new
	callbacks.
	(utrace_derived_probe_group::emit_probe_decl): Ditto.
	(uprobe_derived_probe_group::emit_module_decls): Uses new
	callback.  Makes sure mapping is executable before trying to set a
	probe in it.
	(itrace_derived_probe_group::emit_module_init): Calls
	_stp_sym_init().
	(utrace_derived_probe_group::emit_module_init): Ditto.
	(uprobe_derived_probe_group::emit_module_init): Ditto.
	* runtime/sym.c: Moved task_finder_vma.c inclusion here from
	task_finder.c.
	(_stp_sym_init): New function.
	(_stp_tf_mmap_cb): New function that replaces _stp_tf_vm_cb.
	(_stp_tf_munmap_cb): Ditto.
	* runtime/task_finder.c: Removed task_finder_vma.c inclusion.
	Split vm_callback into 3 callbacks: mmap_callback,
	munmap_callback, and mprotect_callback.
	(stap_register_task_finder_target): Initializes new events
	variables for the new callbacks.
	(__STP_TASK_VM_BASE_EVENTS): No longer specifies syscall entry
	events.
	(__stp_call_mmap_callbacks): New function.
	(__stp_call_mmap_callbacks_with_vma): Ditto.
	(__stp_call_munmap_callbacks): Ditto.
	(__stp_call_mprotect_callbacks): Ditto.
	(__stp_call_vm_callbacks): Removed.
	(__stp_utrace_task_finder_target_quiesce): Calls
	__stp_call_mmap_callbacks() instead of __stp_call_vm_callbacks().
	(__stp_utrace_task_finder_target_syscall_entry): Removed
	function.
	(__stp_utrace_task_finder_target_syscall_exit): Reports raw
	mmap()/mprotect()/munmap() events.