extern int rtx_equal_function_value_matters;
extern tree sequence_rtl_expr;
+
+/* The currently compiled function. */
+struct function *current_function = 0;
+
+/* Global list of all compiled functions. */
+struct function *all_functions = 0;
\f
/* In order to evaluate some expressions, such as function calls returning
structures in memory, we need to temporarily allocate stack locations.
push_function_context_to (context)
tree context;
{
- struct function *p = (struct function *) xmalloc (sizeof (struct function));
+ struct function *p;
+
+ if (current_function == 0)
+ init_dummy_function_start ();
+ p = current_function;
p->next = outer_function_chain;
outer_function_chain = p;
save_varasm_status (p, context);
if (save_machine_status)
(*save_machine_status) (p);
+
+ current_function = 0;
}
void
struct function *p = outer_function_chain;
struct var_refs_queue *queue;
+ current_function = p;
outer_function_chain = p->next;
current_function_contains_functions
fixup_var_refs (queue->modified, queue->promoted_mode,
queue->unsignedp, 0);
- free (p);
-
/* Reset variables that have known state during rtx generation. */
rtx_equal_function_value_matters = 1;
virtuals_instantiated = 0;
return n_blocks;
}
\f
-/* Generate RTL for the start of the function SUBR (a FUNCTION_DECL tree node)
- and initialize static variables for generating RTL for the statements
- of the function. */
-
-void
-init_function_start (subr, filename, line)
- tree subr;
- char *filename;
- int line;
+/* Allocate a function structure and reset its contents to the defaults. */
+static void
+prepare_function_start ()
{
+ current_function = (struct function *) xcalloc (1, sizeof (struct function));
+
init_stmt_for_function ();
cse_not_expected = ! optimize;
/* No stack slots have been made yet. */
stack_slot_list = 0;
+ current_function_has_nonlocal_label = 0;
+ current_function_has_nonlocal_goto = 0;
+
/* There is no stack slot for handling nonlocal gotos. */
nonlocal_goto_handler_slots = 0;
nonlocal_goto_stack_level = 0;
/* Initialize the queue of pending postincrement and postdecrements,
and some other info in expr.c. */
init_expr ();
-
+
/* We haven't done register allocation yet. */
reg_renumber = 0;
init_const_rtx_hash_table ();
- current_function_name = (*decl_printable_name) (subr, 2);
-
- /* Nonzero if this is a nested function that uses a static chain. */
-
- current_function_needs_context
- = (decl_function_context (current_function_decl) != 0
- && ! DECL_NO_STATIC_CHAIN (current_function_decl));
-
/* Set if a call to setjmp is seen. */
current_function_calls_setjmp = 0;
current_function_calls_longjmp = 0;
current_function_calls_alloca = 0;
- current_function_has_nonlocal_label = 0;
- current_function_has_nonlocal_goto = 0;
current_function_contains_functions = 0;
current_function_is_leaf = 0;
current_function_sp_is_unchanging = 0;
tail_recursion_label = 0;
/* We haven't had a need to make a save area for ap yet. */
-
arg_pointer_save_area = 0;
/* No stack slots allocated yet. */
/* Set up to allocate temporaries. */
init_temp_slots ();
- /* Within function body, compute a type's size as soon it is laid out. */
- immediate_size_expand++;
+ /* Indicate that we need to distinguish between the return value of the
+ present function and the return value of a function being called. */
+ rtx_equal_function_value_matters = 1;
+
+ /* Indicate that we have not instantiated virtual registers yet. */
+ virtuals_instantiated = 0;
+
+ /* Indicate we have no need of a frame pointer yet. */
+ frame_pointer_needed = 0;
+
+ /* By default assume not varargs or stdarg. */
+ current_function_varargs = 0;
+ current_function_stdarg = 0;
/* We haven't made any trampolines for this function yet. */
trampoline_list = 0;
inhibit_defer_pop = 0;
current_function_outgoing_args_size = 0;
+}
+
+/* Initialize the rtl expansion mechanism so that we can do simple things
+ like generate sequences. This is used to provide a context during global
+ initialization of some passes. */
+void
+init_dummy_function_start ()
+{
+ prepare_function_start ();
+}
+
+/* Generate RTL for the start of the function SUBR (a FUNCTION_DECL tree node)
+ and initialize static variables for generating RTL for the statements
+ of the function. */
+
+void
+init_function_start (subr, filename, line)
+ tree subr;
+ char *filename;
+ int line;
+{
+ prepare_function_start ();
+
+ /* Remember this function for later. */
+ current_function->next_global = all_functions;
+ all_functions = current_function;
+
+ current_function_name = (*decl_printable_name) (subr, 2);
+
+ /* Nonzero if this is a nested function that uses a static chain. */
+
+ current_function_needs_context
+ = (decl_function_context (current_function_decl) != 0
+ && ! DECL_NO_STATIC_CHAIN (current_function_decl));
+
+ /* Within function body, compute a type's size as soon it is laid out. */
+ immediate_size_expand++;
/* Prevent ever trying to delete the first instruction of a function.
Also tell final how to output a linenum before the function prologue.
current_function_returns_pointer
= POINTER_TYPE_P (TREE_TYPE (DECL_RESULT (subr)));
-
- /* Indicate that we need to distinguish between the return value of the
- present function and the return value of a function being called. */
- rtx_equal_function_value_matters = 1;
-
- /* Indicate that we have not instantiated virtual registers yet. */
- virtuals_instantiated = 0;
-
- /* Indicate we have no need of a frame pointer yet. */
- frame_pointer_needed = 0;
-
- /* By default assume not varargs or stdarg. */
- current_function_varargs = 0;
- current_function_stdarg = 0;
}
/* Indicate that the current function uses extra args
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