/* Callgraph based intraprocedural optimizations.
- Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
Contributed by Jan Hubicka
This file is part of GCC.
mark_referenced call in assemble_variable functions referenced by
static variables are noticed too.
- The intra-procedural information is produced and it's existence
+ The intra-procedural information is produced and its existence
indicated by global_info_ready. Once this flag is set it is impossible
to change function from !reachable to reachable and thus
assemble_variable no longer call mark_referenced.
decision on whether function is needed is made more conservative so
uninlininable static functions are needed too. During the call-graph
construction the edge destinations are not marked as reachable and it
- is completely relied upn assemble_variable to mark them.
-
- Inlining decision heuristics
- ??? Move this to separate file after tree-ssa merge.
-
- We separate inlining decisions from the inliner itself and store it
- inside callgraph as so called inline plan. Refer to cgraph.c
- documentation about particular representation of inline plans in the
- callgraph
-
- The implementation of particular heuristics is separated from
- the rest of code to make it easier to replace it with more complicated
- implementation in the future. The rest of inlining code acts as a
- library aimed to modify the callgraph and verify that the parameters
- on code size growth fits.
-
- To mark given call inline, use cgraph_mark_inline function, the
- verification is performed by cgraph_default_inline_p and
- cgraph_check_inline_limits.
-
- The heuristics implements simple knapsack style algorithm ordering
- all functions by their "profitability" (estimated by code size growth)
- and inlining them in priority order.
-
- cgraph_decide_inlining implements heuristics taking whole callgraph
- into account, while cgraph_decide_inlining_incrementally considers
- only one function at a time and is used in non-unit-at-a-time mode. */
-
-
-/* Additionally this file gathers information about how local statics
- are used. This is done in cgraph_characterize_statics. After the
- call graph has been built, each function is analyzed to determine
- which local static variables are either read or written or have
- their address taken. Any local static that has its address taken
- is removed from consideration. Once the local read and writes
- are determined, a transitive closure of this information is
- performed over the call graph to determine the worst case set of
- side effects of each call. In a later part of the compiler, these
- local and global sets are examined to make the call clobbering less
- traumatic both with respect to aliasing and to code generation. */
+ is completely relied upn assemble_variable to mark them. */
+
#include "config.h"
#include "system.h"
#include "tree-flow.h"
#include "tree-inline.h"
#include "langhooks.h"
-#include "hashtab.h"
+#include "pointer-set.h"
#include "toplev.h"
#include "flags.h"
#include "ggc.h"
#include "intl.h"
#include "function.h"
#include "tree-gimple.h"
-
-#define INSNS_PER_CALL 10
+#include "tree-pass.h"
+#include "output.h"
static void cgraph_expand_all_functions (void);
static void cgraph_mark_functions_to_output (void);
static void cgraph_expand_function (struct cgraph_node *);
-static tree record_call_1 (tree *, int *, void *);
-static void cgraph_mark_local_and_external_functions (void);
-static bool cgraph_default_inline_p (struct cgraph_node *n);
+static tree record_reference (tree *, int *, void *);
static void cgraph_analyze_function (struct cgraph_node *node);
-static void cgraph_decide_inlining_incrementally (struct cgraph_node *);
-/* Statistics we collect about inlining algorithm. */
-static int ncalls_inlined;
-static int nfunctions_inlined;
-static int initial_insns;
-static int overall_insns;
-
-/* Records tree nodes seen in cgraph_create_edges. Simply using
+/* Records tree nodes seen in record_reference. Simply using
walk_tree_without_duplicates doesn't guarantee each node is visited
once because it gets a new htab upon each recursive call from
- record_calls_1. */
-static htab_t visited_nodes;
+ record_reference itself. */
+static struct pointer_set_t *visited_nodes;
static FILE *cgraph_dump_file;
-/* These splay trees contain all of the static variables that are
- being considered by the compilation level alias analysis. For
- module_at_a_time compilation, this is the set of static but not
- public variables. Any variables that either have their address
- taken or participate in otherwise unsavory operations are deleted
- from this list. */
-static GTY((param1_is(tree), param2_is(tree)))
- splay_tree static_vars_to_consider_by_tree;
-
-/* FIXME -- PROFILE-RESTRUCTURE: change comment from DECL_UID to var-ann. */
-/* same as above but indexed by DECL_UID */
-static GTY((param1_is(int), param2_is(tree)))
- splay_tree static_vars_to_consider_by_uid;
-
-/* This bitmap is used to knock out the module static variables whose
- addresses have been taken and passed around. This is indexed by
- uid. */
-static bitmap module_statics_escape;
-
-/* FIXME -- PROFILE-RESTRUCTURE: change comment from DECL_UID to var-ann. */
-/* A bit is set for every module static we are considering and is
- indexed by DECL_UID. This is ored into the local info when asm
- code is found that clobbers all memory. */
-static GTY(()) bitmap all_module_statics;
-
-/* Holds the value of "memory". */
-static tree memory_identifier;
-
/* Determine if function DECL is needed. That is, visible to something
either outside this translation unit, something magic in the system
configury, or (if not doing unit-at-a-time) to something we havn't
{
tree origin;
+ /* If the user told us it is used, then it must be so. */
+ if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
+ return true;
+
+ /* ??? If the assembler name is set by hand, it is possible to assemble
+ the name later after finalizing the function and the fact is noticed
+ in assemble_name then. This is arguably a bug. */
+ if (DECL_ASSEMBLER_NAME_SET_P (decl)
+ && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
+ return true;
+
/* If we decided it was needed before, but at the time we didn't have
the body of the function available, then it's still needed. We have
to go back and re-check its dependencies now. */
if (DECL_STATIC_CONSTRUCTOR (decl) || DECL_STATIC_DESTRUCTOR (decl))
return true;
- /* If the user told us it is used, then it must be so. */
- if (lookup_attribute ("used", DECL_ATTRIBUTES (decl)))
- return true;
-
- /* ??? If the assembler name is set by hand, it is possible to assemble
- the name later after finalizing the function and the fact is noticed
- in assemble_name then. This is arguably a bug. */
- if (DECL_ASSEMBLER_NAME_SET_P (decl)
- && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
- return true;
-
if (flag_unit_at_a_time)
return false;
return false;
}
-/* Debugging function for postorder and inorder code. NOTE is a string
- that is printed before the nodes are printed. ORDER is an array of
- cgraph_nodes that has COUNT useful nodes in it. */
-
-static void
-print_order (const char * note, struct cgraph_node** order, int count)
+/* Walk the decls we marked as necessary and see if they reference new
+ variables or functions and add them into the worklists. */
+static bool
+cgraph_varpool_analyze_pending_decls (void)
{
- int i;
- fprintf (cgraph_dump_file, "\n\n ordered call graph: %s\n", note);
-
- for (i = count - 1; i >= 0; i--)
- {
- struct cgraph_edge *edge;
-
- fprintf (cgraph_dump_file, "\n %s<-(", cgraph_node_name (order[i]));
+ bool changed = false;
+ timevar_push (TV_CGRAPH);
- for (edge = order[i]->callers; edge; edge = edge->next_caller)
- fprintf (cgraph_dump_file, " %s", cgraph_node_name (edge->caller));
- fprintf (cgraph_dump_file, ")");
- }
- fprintf (cgraph_dump_file, "\n");
-}
+ while (cgraph_varpool_first_unanalyzed_node)
+ {
+ tree decl = cgraph_varpool_first_unanalyzed_node->decl;
-/* FIXME -- PROFILE-RESTRUCTURE: Remove this function, it becomes a nop. */
-/* Convert IN_DECL bitmap which is indexed by DECL_UID to IN_ANN, a
- bitmap indexed by var_ann (VAR_DECL)->uid. */
+ cgraph_varpool_first_unanalyzed_node->analyzed = true;
-static void
-convert_UIDs_in_bitmap (bitmap in_ann, bitmap in_decl)
-{
- int index;
- bitmap_iterator bi;
+ cgraph_varpool_first_unanalyzed_node = cgraph_varpool_first_unanalyzed_node->next_needed;
- EXECUTE_IF_SET_IN_BITMAP(in_decl, 0, index, bi)
- {
- splay_tree_node n =
- splay_tree_lookup (static_vars_to_consider_by_uid, index);
- if (n != NULL)
+ if (DECL_INITIAL (decl))
{
- tree t = (tree)n->value;
- var_ann_t va = var_ann (t);
- if (va)
- bitmap_set_bit(in_ann, va->uid);
+ visited_nodes = pointer_set_create ();
+ walk_tree (&DECL_INITIAL (decl), record_reference, NULL, visited_nodes);
+ pointer_set_destroy (visited_nodes);
+ visited_nodes = NULL;
}
+ changed = true;
}
+ timevar_pop (TV_CGRAPH);
+ return changed;
}
-/* FIXME -- PROFILE-RESTRUCTURE: Delete all stmts initing *_decl_uid
- variables. Add code to create a var_ann for tree node within the
- cgraph_node and have it point to the newly created
- static_vars_info. */
-/* Create a new static_vars_info structure and place it into
- cgraph_node, NODE. INIT_GLOBAL causes the global part of the
- structure to be initialized. */
-static static_vars_info_t
-new_static_vars_info(struct cgraph_node* node,
- bool init_global)
-{
- static_vars_info_t info = ggc_calloc (1, sizeof (struct static_vars_info_d));
- local_static_vars_info_t l
- = ggc_calloc (1, sizeof (struct local_static_vars_info_d));
-
- /* Add the info to the tree's annotation. */
- var_ann_t var_ann = get_var_ann(node->decl);
- node->static_vars_info = info;
- var_ann->static_vars_info = info;
-
- info->local = l;
- l->statics_read_by_decl_uid = BITMAP_GGC_ALLOC ();
- l->statics_written_by_decl_uid = BITMAP_GGC_ALLOC ();
-
- if (init_global)
- {
- global_static_vars_info_t g
- = ggc_calloc (1, sizeof (struct global_static_vars_info_d));
- info->global = g;
- g->statics_read_by_decl_uid = BITMAP_GGC_ALLOC ();
- g->statics_written_by_decl_uid = BITMAP_GGC_ALLOC ();
- g->statics_read_by_ann_uid = BITMAP_GGC_ALLOC ();
- g->statics_written_by_ann_uid = BITMAP_GGC_ALLOC ();
- g->statics_not_read_by_decl_uid = BITMAP_GGC_ALLOC ();
- g->statics_not_written_by_decl_uid = BITMAP_GGC_ALLOC ();
- g->statics_not_read_by_ann_uid = BITMAP_GGC_ALLOC ();
- g->statics_not_written_by_ann_uid = BITMAP_GGC_ALLOC ();
- }
- return info;
-}
-
+/* Optimization of function bodies might've rendered some variables as
+ unnecessary so we want to avoid these from being compiled.
-/* FIXME -- PROFILE-RESTRUCTURE: Remove this function, it becomes a
- nop. */
-/* The bitmaps used to represent the static global variables are
- indexed by DECL_UID however, this is not used inside of functions
- to index the ssa variables. The denser var_ann (VAR_DECL)->uid is
- used there. This function is called from
- tree_dfa:find_referenced_vars after the denser representation is
- built. This function invalidates any cached indexes. */
-
-void
-cgraph_reset_static_var_maps (void)
+ This is done by pruning the queue and keeping only the variables that
+ really appear needed (ie they are either externally visible or referenced
+ by compiled function). Re-doing the reachability analysis on variables
+ brings back the remaining variables referenced by these. */
+static void
+cgraph_varpool_remove_unreferenced_decls (void)
{
- struct cgraph_node *node;
-
- for (node = cgraph_nodes; node; node = node->next)
- {
- static_vars_info_t info = node->static_vars_info;
- if (info)
- {
- global_static_vars_info_t g = info->global;
- if (g->var_anns_valid)
- {
- bitmap_clear (g->statics_read_by_ann_uid);
- bitmap_clear (g->statics_written_by_ann_uid);
- bitmap_clear (g->statics_not_read_by_ann_uid);
- bitmap_clear (g->statics_not_written_by_ann_uid);
- g->var_anns_valid = false;
- }
- }
- else
- /* Handle the case where a cgraph node has been inserted
- after the analysis. We know nothing. */
- new_static_vars_info(node, true);
- }
-}
+ struct cgraph_varpool_node *next, *node = cgraph_varpool_nodes_queue;
-/* Get the global static_vars_info structure for the function FN and
- make sure the ann_uid's bitmaps are properly converted. */
-
-static global_static_vars_info_t
-get_global_static_vars_info (tree fn)
-{
- global_static_vars_info_t g;
+ cgraph_varpool_reset_queue ();
- /* Was not compiled -O2 or higher. */
- static_vars_info_t info = get_var_ann(fn)->static_vars_info;
- if (!info)
- return NULL;
+ if (errorcount || sorrycount)
+ return;
- g = info->global;
- if (!g->var_anns_valid)
+ while (node)
{
- convert_UIDs_in_bitmap (g->statics_read_by_ann_uid,
- g->statics_read_by_decl_uid);
- convert_UIDs_in_bitmap (g->statics_written_by_ann_uid,
- g->statics_written_by_decl_uid);
- convert_UIDs_in_bitmap (g->statics_not_read_by_ann_uid,
- g->statics_not_read_by_decl_uid);
- convert_UIDs_in_bitmap (g->statics_not_written_by_ann_uid,
- g->statics_not_written_by_decl_uid);
- g->var_anns_valid = true;
- }
- return g;
-}
+ tree decl = node->decl;
+ next = node->next_needed;
+ node->needed = 0;
-/* Return a bitmap indexed by var_ann (VAR_DECL)->uid for the static
- variables that are not read during the execution of the function
- FN. Returns NULL if no data is available, such as it was not
- compiled with -O2 or higher. */
+ if (node->finalized
+ && ((DECL_ASSEMBLER_NAME_SET_P (decl)
+ && TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl)))
+ || node->force_output
+ || decide_is_variable_needed (node, decl)))
+ cgraph_varpool_mark_needed_node (node);
-bitmap
-get_global_statics_not_read (tree fn)
-{
- global_static_vars_info_t g = get_global_static_vars_info (fn);
- if (g)
- return g->statics_not_read_by_ann_uid;
- else
- return NULL;
+ node = next;
+ }
+ cgraph_varpool_analyze_pending_decls ();
}
-/* Return a bitmap indexed by var_ann (VAR_DECL)->uid for the static
- variables that are not written during the execution of the function
- FN. Note that variables written may or may not be read during the
- function call. Returns NULL if no data is available, such as it
- was not compiled with -O2 or higher. */
-
-bitmap
-get_global_statics_not_written (tree fn)
-{
- global_static_vars_info_t g = get_global_static_vars_info (fn);
- if (g)
- return g->statics_not_written_by_ann_uid;
- else
- return NULL;
-}
/* When not doing unit-at-a-time, output all functions enqueued.
Return true when such a functions were found. */
cgraph_nodes_queue = cgraph_nodes_queue->next_needed;
n->next_needed = NULL;
- if (!n->global.inlined_to && !DECL_EXTERNAL (n->decl))
+ if (!n->global.inlined_to
+ && !n->alias
+ && !DECL_EXTERNAL (n->decl))
{
cgraph_expand_function (n);
output = true;
return output;
}
+/* As an GCC extension we allow redefinition of the function. The
+ semantics when both copies of bodies differ is not well defined.
+ We replace the old body with new body so in unit at a time mode
+ we always use new body, while in normal mode we may end up with
+ old body inlined into some functions and new body expanded and
+ inlined in others.
+
+ ??? It may make more sense to use one body for inlining and other
+ body for expanding the function but this is difficult to do. */
+
+static void
+cgraph_reset_node (struct cgraph_node *node)
+{
+ /* If node->output is set, then this is a unit-at-a-time compilation
+ and we have already begun whole-unit analysis. This is *not*
+ testing for whether we've already emitted the function. That
+ case can be sort-of legitimately seen with real function
+ redefinition errors. I would argue that the front end should
+ never present us with such a case, but don't enforce that for now. */
+ gcc_assert (!node->output);
+
+ /* Reset our data structures so we can analyze the function again. */
+ memset (&node->local, 0, sizeof (node->local));
+ memset (&node->global, 0, sizeof (node->global));
+ memset (&node->rtl, 0, sizeof (node->rtl));
+ node->analyzed = false;
+ node->local.redefined_extern_inline = true;
+ node->local.finalized = false;
+
+ if (!flag_unit_at_a_time)
+ {
+ struct cgraph_node *n;
+
+ for (n = cgraph_nodes; n; n = n->next)
+ if (n->global.inlined_to == node)
+ cgraph_remove_node (n);
+ }
+
+ cgraph_node_remove_callees (node);
+
+ /* We may need to re-queue the node for assembling in case
+ we already proceeded it and ignored as not needed. */
+ if (node->reachable && !flag_unit_at_a_time)
+ {
+ struct cgraph_node *n;
+
+ for (n = cgraph_nodes_queue; n; n = n->next_needed)
+ if (n == node)
+ break;
+ if (!n)
+ node->reachable = 0;
+ }
+}
/* DECL has been parsed. Take it, queue it, compile it at the whim of the
logic in effect. If NESTED is true, then our caller cannot stand to have
struct cgraph_node *node = cgraph_node (decl);
if (node->local.finalized)
- {
- /* As an GCC extension we allow redefinition of the function. The
- semantics when both copies of bodies differ is not well defined.
- We replace the old body with new body so in unit at a time mode
- we always use new body, while in normal mode we may end up with
- old body inlined into some functions and new body expanded and
- inlined in others.
-
- ??? It may make more sense to use one body for inlining and other
- body for expanding the function but this is difficult to do. */
-
- /* If node->output is set, then this is a unit-at-a-time compilation
- and we have already begun whole-unit analysis. This is *not*
- testing for whether we've already emitted the function. That
- case can be sort-of legitimately seen with real function
- redefinition errors. I would argue that the front end should
- never present us with such a case, but don't enforce that for now. */
- gcc_assert (!node->output);
-
- /* Reset our data structures so we can analyze the function again. */
- memset (&node->local, 0, sizeof (node->local));
- memset (&node->global, 0, sizeof (node->global));
- memset (&node->rtl, 0, sizeof (node->rtl));
- node->analyzed = false;
- node->local.redefined_extern_inline = true;
- while (node->callees)
- cgraph_remove_edge (node->callees);
-
- /* We may need to re-queue the node for assembling in case
- we already proceeded it and ignored as not needed. */
- if (node->reachable && !flag_unit_at_a_time)
- {
- struct cgraph_node *n;
-
- for (n = cgraph_nodes_queue; n; n = n->next_needed)
- if (n == node)
- break;
- if (!n)
- node->reachable = 0;
- }
- }
+ cgraph_reset_node (node);
notice_global_symbol (decl);
node->decl = decl;
node->local.finalized = true;
+ node->lowered = DECL_STRUCT_FUNCTION (decl)->cfg != NULL;
if (node->nested)
lower_nested_functions (decl);
gcc_assert (!node->nested);
if (decide_is_function_needed (node, decl))
cgraph_mark_needed_node (node);
+ /* Since we reclaim unreachable nodes at the end of every language
+ level unit, we need to be conservative about possible entry points
+ there. */
+ if (TREE_PUBLIC (decl) && !DECL_COMDAT (decl) && !DECL_EXTERNAL (decl))
+ cgraph_mark_reachable_node (node);
+
/* If not unit at a time, go ahead and emit everything we've found
to be reachable at this time. */
if (!nested)
do_warn_unused_parameter (decl);
}
+void
+cgraph_lower_function (struct cgraph_node *node)
+{
+ if (node->lowered)
+ return;
+ tree_lowering_passes (node->decl);
+ node->lowered = true;
+}
+
/* Walk tree and record all calls. Called via walk_tree. */
static tree
-record_call_1 (tree *tp, int *walk_subtrees, void *data)
+record_reference (tree *tp, int *walk_subtrees, void *data)
{
tree t = *tp;
/* ??? Really, we should mark this decl as *potentially* referenced
by this function and re-examine whether the decl is actually used
after rtl has been generated. */
- if (TREE_STATIC (t))
+ if (TREE_STATIC (t) || DECL_EXTERNAL (t))
{
cgraph_varpool_mark_needed_node (cgraph_varpool_node (t));
if (lang_hooks.callgraph.analyze_expr)
}
break;
+ case FDESC_EXPR:
case ADDR_EXPR:
if (flag_unit_at_a_time)
{
}
break;
- case CALL_EXPR:
- {
- tree decl = get_callee_fndecl (*tp);
- if (decl && TREE_CODE (decl) == FUNCTION_DECL)
- {
- cgraph_create_edge (data, cgraph_node (decl), *tp);
-
- /* When we see a function call, we don't want to look at the
- function reference in the ADDR_EXPR that is hanging from
- the CALL_EXPR we're examining here, because we would
- conclude incorrectly that the function's address could be
- taken by something that is not a function call. So only
- walk the function parameter list, skip the other subtrees. */
-
- walk_tree (&TREE_OPERAND (*tp, 1), record_call_1, data,
- visited_nodes);
- *walk_subtrees = 0;
- }
- break;
- }
-
default:
/* Save some cycles by not walking types and declaration as we
won't find anything useful there anyway. */
/* Create cgraph edges for function calls inside BODY from NODE. */
-void
+static void
cgraph_create_edges (struct cgraph_node *node, tree body)
{
- /* The nodes we're interested in are never shared, so walk
- the tree ignoring duplicates. */
- visited_nodes = htab_create (37, htab_hash_pointer,
- htab_eq_pointer, NULL);
- walk_tree (&body, record_call_1, node, visited_nodes);
- htab_delete (visited_nodes);
- visited_nodes = NULL;
-}
-
-static bool error_found;
+ basic_block bb;
-/* Callbrack of verify_cgraph_node. Check that all call_exprs have cgraph
- nodes. */
-
-static tree
-verify_cgraph_node_1 (tree *tp, int *walk_subtrees, void *data)
-{
- tree t = *tp;
- tree decl;
+ struct function *this_cfun = DECL_STRUCT_FUNCTION (body);
+ block_stmt_iterator bsi;
+ tree step;
+ visited_nodes = pointer_set_create ();
- if (TREE_CODE (t) == CALL_EXPR && (decl = get_callee_fndecl (t)))
- {
- struct cgraph_edge *e = cgraph_edge (data, t);
- if (e)
- {
- if (e->aux)
- {
- error ("Shared call_expr:");
- debug_tree (t);
- error_found = true;
- }
- if (e->callee->decl != cgraph_node (decl)->decl)
- {
- error ("Edge points to wrong declaration:");
- debug_tree (e->callee->decl);
- fprintf (stderr," Instead of:");
- debug_tree (decl);
- }
- e->aux = (void *)1;
- }
- else
- {
- error ("Missing callgraph edge for call expr:");
- debug_tree (t);
- error_found = true;
- }
- }
+ /* Reach the trees by walking over the CFG, and note the
+ enclosing basic-blocks in the call edges. */
+ FOR_EACH_BB_FN (bb, this_cfun)
+ for (bsi = bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
+ {
+ tree stmt = bsi_stmt (bsi);
+ tree call = get_call_expr_in (stmt);
+ tree decl;
- /* Save some cycles by not walking types and declaration as we
- won't find anything useful there anyway. */
- if (IS_TYPE_OR_DECL_P (*tp))
- *walk_subtrees = 0;
+ if (call && (decl = get_callee_fndecl (call)))
+ {
+ cgraph_create_edge (node, cgraph_node (decl), stmt,
+ bb->count,
+ bb->loop_depth);
+ walk_tree (&TREE_OPERAND (call, 1),
+ record_reference, node, visited_nodes);
+ if (TREE_CODE (stmt) == MODIFY_EXPR)
+ walk_tree (&TREE_OPERAND (stmt, 0),
+ record_reference, node, visited_nodes);
+ }
+ else
+ walk_tree (bsi_stmt_ptr (bsi), record_reference, node, visited_nodes);
+ }
- return NULL_TREE;
+ /* Look for initializers of constant variables and private statics. */
+ for (step = DECL_STRUCT_FUNCTION (body)->unexpanded_var_list;
+ step;
+ step = TREE_CHAIN (step))
+ {
+ tree decl = TREE_VALUE (step);
+ if (TREE_CODE (decl) == VAR_DECL
+ && (TREE_STATIC (decl) && !DECL_EXTERNAL (decl))
+ && flag_unit_at_a_time)
+ cgraph_varpool_finalize_decl (decl);
+ else if (TREE_CODE (decl) == VAR_DECL && DECL_INITIAL (decl))
+ walk_tree (&DECL_INITIAL (decl), record_reference, node, visited_nodes);
+ }
+
+ pointer_set_destroy (visited_nodes);
+ visited_nodes = NULL;
}
+
/* Verify cgraph nodes of given cgraph node. */
void
verify_cgraph_node (struct cgraph_node *node)
{
struct cgraph_edge *e;
struct cgraph_node *main_clone;
+ struct function *this_cfun = DECL_STRUCT_FUNCTION (node->decl);
+ basic_block this_block;
+ block_stmt_iterator bsi;
+ bool error_found = false;
timevar_push (TV_CGRAPH_VERIFY);
- error_found = false;
for (e = node->callees; e; e = e->next_callee)
if (e->aux)
{
}
if (node->global.inlined_to == node)
{
- error ("Inlined_to pointer reffers to itself");
+ error ("Inlined_to pointer refers to itself");
error_found = true;
}
&& DECL_SAVED_TREE (node->decl) && !TREE_ASM_WRITTEN (node->decl)
&& (!DECL_EXTERNAL (node->decl) || node->global.inlined_to))
{
- walk_tree_without_duplicates (&DECL_SAVED_TREE (node->decl),
- verify_cgraph_node_1, node);
+ if (this_cfun->cfg)
+ {
+ /* The nodes we're interested in are never shared, so walk
+ the tree ignoring duplicates. */
+ visited_nodes = pointer_set_create ();
+ /* Reach the trees by walking over the CFG, and note the
+ enclosing basic-blocks in the call edges. */
+ FOR_EACH_BB_FN (this_block, this_cfun)
+ for (bsi = bsi_start (this_block); !bsi_end_p (bsi); bsi_next (&bsi))
+ {
+ tree stmt = bsi_stmt (bsi);
+ tree call = get_call_expr_in (stmt);
+ tree decl;
+ if (call && (decl = get_callee_fndecl (call)))
+ {
+ struct cgraph_edge *e = cgraph_edge (node, stmt);
+ if (e)
+ {
+ if (e->aux)
+ {
+ error ("Shared call_stmt:");
+ debug_generic_stmt (stmt);
+ error_found = true;
+ }
+ if (e->callee->decl != cgraph_node (decl)->decl)
+ {
+ error ("Edge points to wrong declaration:");
+ debug_tree (e->callee->decl);
+ fprintf (stderr," Instead of:");
+ debug_tree (decl);
+ }
+ e->aux = (void *)1;
+ }
+ else
+ {
+ error ("Missing callgraph edge for call stmt:");
+ debug_generic_stmt (stmt);
+ error_found = true;
+ }
+ }
+ }
+ pointer_set_destroy (visited_nodes);
+ visited_nodes = NULL;
+ }
+ else
+ /* No CFG available?! */
+ gcc_unreachable ();
+
for (e = node->callees; e; e = e->next_callee)
{
if (!e->aux)
{
- error ("Edge %s->%s has no corresponding call_expr",
+ error ("Edge %s->%s has no corresponding call_stmt",
cgraph_node_name (e->caller),
cgraph_node_name (e->callee));
+ debug_generic_stmt (e->call_stmt);
error_found = true;
}
e->aux = 0;
verify_cgraph_node (node);
}
+
+/* Output all variables enqueued to be assembled. */
+bool
+cgraph_varpool_assemble_pending_decls (void)
+{
+ bool changed = false;
+
+ if (errorcount || sorrycount)
+ return false;
+
+ /* EH might mark decls as needed during expansion. This should be safe since
+ we don't create references to new function, but it should not be used
+ elsewhere. */
+ cgraph_varpool_analyze_pending_decls ();
+
+ while (cgraph_varpool_nodes_queue)
+ {
+ tree decl = cgraph_varpool_nodes_queue->decl;
+ struct cgraph_varpool_node *node = cgraph_varpool_nodes_queue;
+
+ cgraph_varpool_nodes_queue = cgraph_varpool_nodes_queue->next_needed;
+ if (!TREE_ASM_WRITTEN (decl) && !node->alias && !DECL_EXTERNAL (decl))
+ {
+ assemble_variable (decl, 0, 1, 0);
+ /* Local static variables are never seen by check_global_declarations
+ so we need to output debug info by hand. */
+ if (decl_function_context (decl) && errorcount == 0 && sorrycount == 0)
+ {
+ timevar_push (TV_SYMOUT);
+ (*debug_hooks->global_decl) (decl);
+ timevar_pop (TV_SYMOUT);
+ }
+ changed = true;
+ }
+ node->next_needed = NULL;
+ }
+ return changed;
+}
+
/* Analyze the function scheduled to be output. */
static void
cgraph_analyze_function (struct cgraph_node *node)
struct cgraph_edge *e;
current_function_decl = decl;
+ push_cfun (DECL_STRUCT_FUNCTION (decl));
+ cgraph_lower_function (node);
/* First kill forward declaration so reverse inlining works properly. */
- cgraph_create_edges (node, DECL_SAVED_TREE (decl));
+ cgraph_create_edges (node, decl);
node->local.inlinable = tree_inlinable_function_p (decl);
- node->local.self_insns = estimate_num_insns (DECL_SAVED_TREE (decl));
+ node->local.self_insns = estimate_num_insns (decl);
if (node->local.inlinable)
node->local.disregard_inline_limits
= lang_hooks.tree_inlining.disregard_inline_limits (decl);
node->global.insns = node->local.self_insns;
node->analyzed = true;
+ pop_cfun ();
current_function_decl = NULL;
}
cgraph_finalize_compilation_unit (void)
{
struct cgraph_node *node;
+ /* Keep track of already processed nodes when called multiple times for
+ intermodule optimization. */
+ static struct cgraph_node *first_analyzed;
+
+ finish_aliases_1 ();
if (!flag_unit_at_a_time)
{
return;
}
- cgraph_varpool_assemble_pending_decls ();
if (!quiet_flag)
- fprintf (stderr, "\nAnalyzing compilation unit\n");
+ {
+ fprintf (stderr, "\nAnalyzing compilation unit");
+ fflush (stderr);
+ }
timevar_push (TV_CGRAPH);
+ cgraph_varpool_analyze_pending_decls ();
if (cgraph_dump_file)
{
fprintf (cgraph_dump_file, "Initial entry points:");
- for (node = cgraph_nodes; node; node = node->next)
+ for (node = cgraph_nodes; node != first_analyzed; node = node->next)
if (node->needed && DECL_SAVED_TREE (node->decl))
fprintf (cgraph_dump_file, " %s", cgraph_node_name (node));
fprintf (cgraph_dump_file, "\n");
node->next_needed = NULL;
/* ??? It is possible to create extern inline function and later using
- weak alas attribute to kill its body. See
+ weak alias attribute to kill its body. See
gcc.c-torture/compile/20011119-1.c */
if (!DECL_SAVED_TREE (decl))
- continue;
+ {
+ cgraph_reset_node (node);
+ continue;
+ }
gcc_assert (!node->analyzed && node->reachable);
gcc_assert (DECL_SAVED_TREE (decl));
if (!edge->callee->reachable)
cgraph_mark_reachable_node (edge->callee);
- cgraph_varpool_assemble_pending_decls ();
+ cgraph_varpool_analyze_pending_decls ();
}
/* Collect entry points to the unit. */
if (cgraph_dump_file)
{
fprintf (cgraph_dump_file, "Unit entry points:");
- for (node = cgraph_nodes; node; node = node->next)
+ for (node = cgraph_nodes; node != first_analyzed; node = node->next)
if (node->needed && DECL_SAVED_TREE (node->decl))
fprintf (cgraph_dump_file, " %s", cgraph_node_name (node));
fprintf (cgraph_dump_file, "\n\nInitial ");
if (cgraph_dump_file)
fprintf (cgraph_dump_file, "\nReclaiming functions:");
- for (node = cgraph_nodes; node; node = node->next)
+ for (node = cgraph_nodes; node != first_analyzed; node = node->next)
{
tree decl = node->decl;
+ if (node->local.finalized && !DECL_SAVED_TREE (decl))
+ cgraph_reset_node (node);
+
if (!node->reachable && DECL_SAVED_TREE (decl))
{
if (cgraph_dump_file)
fprintf (cgraph_dump_file, " %s", cgraph_node_name (node));
cgraph_remove_node (node);
+ continue;
}
else
node->next_needed = NULL;
+ gcc_assert (!node->local.finalized || DECL_SAVED_TREE (decl));
+ gcc_assert (node->analyzed == node->local.finalized);
}
if (cgraph_dump_file)
{
fprintf (cgraph_dump_file, "\n\nReclaimed ");
dump_cgraph (cgraph_dump_file);
}
+ first_analyzed = cgraph_nodes;
ggc_collect ();
timevar_pop (TV_CGRAPH);
}
if (flag_unit_at_a_time)
announce_function (decl);
+ cgraph_lower_function (node);
+
/* Generate RTL for the body of DECL. */
lang_hooks.callgraph.expand_function (decl);
DECL_INITIAL (node->decl) = error_mark_node;
/* Eliminate all call edges. This is important so the call_expr no longer
points to the dead function body. */
- while (node->callees)
- cgraph_remove_edge (node->callees);
+ cgraph_node_remove_callees (node);
}
+
+ cgraph_function_flags_ready = true;
}
-/* Fill array order with all nodes with output flag set in the reverse
- topological order. */
+/* Return true when CALLER_DECL should be inlined into CALLEE_DECL. */
-static int
-cgraph_postorder (struct cgraph_node **order)
+bool
+cgraph_inline_p (struct cgraph_edge *e, const char **reason)
{
- struct cgraph_node *node, *node2;
- int stack_size = 0;
- int order_pos = 0;
- struct cgraph_edge *edge, last;
+ *reason = e->inline_failed;
+ return !e->inline_failed;
+}
- struct cgraph_node **stack =
- xcalloc (cgraph_n_nodes, sizeof (struct cgraph_node *));
- /* We have to deal with cycles nicely, so use a depth first traversal
- output algorithm. Ignore the fact that some functions won't need
- to be output and put them into order as well, so we get dependencies
- right through intline functions. */
- for (node = cgraph_nodes; node; node = node->next)
- node->aux = NULL;
- for (node = cgraph_nodes; node; node = node->next)
- if (!node->aux)
- {
- node2 = node;
- if (!node->callers)
- node->aux = &last;
- else
- node->aux = node->callers;
- while (node2)
- {
- while (node2->aux != &last)
- {
- edge = node2->aux;
- if (edge->next_caller)
- node2->aux = edge->next_caller;
- else
- node2->aux = &last;
- if (!edge->caller->aux)
- {
- if (!edge->caller->callers)
- edge->caller->aux = &last;
- else
- edge->caller->aux = edge->caller->callers;
- stack[stack_size++] = node2;
- node2 = edge->caller;
- break;
- }
- }
- if (node2->aux == &last)
- {
- order[order_pos++] = node2;
- if (stack_size)
- node2 = stack[--stack_size];
- else
- node2 = NULL;
- }
- }
- }
- free (stack);
- return order_pos;
-}
-struct searchc_env {
- struct cgraph_node **stack;
- int stack_size;
- struct cgraph_node **result;
- int order_pos;
- splay_tree nodes_marked_new;
- bool reduce;
- int count;
-};
-
-struct dfs_info {
- int dfn_number;
- int low_link;
- bool new;
- bool on_stack;
-};
-
-/* This is an implementation of Tarjan's strongly connected region
- finder as reprinted in Aho Hopcraft and Ullman's The Design and
- Analysis of Computer Programs (1975) pages 192-193. This version
- has been customized for cgraph_nodes. The env parameter is because
- it is recursive and there are no nested functions here. This
- function should only be called from itself or
- cgraph_reduced_inorder. ENV is a stack env and would be
- unnecessary if C had nested functions. V is the node to start
- searching from. */
+/* Expand all functions that must be output.
+
+ Attempt to topologically sort the nodes so function is output when
+ all called functions are already assembled to allow data to be
+ propagated across the callgraph. Use a stack to get smaller distance
+ between a function and its callees (later we may choose to use a more
+ sophisticated algorithm for function reordering; we will likely want
+ to use subsections to make the output functions appear in top-down
+ order). */
static void
-searchc (struct searchc_env* env, struct cgraph_node *v)
+cgraph_expand_all_functions (void)
{
- struct cgraph_edge *edge;
- struct dfs_info *v_info = v->aux;
-
- /* mark node as old */
- v_info->new = false;
- splay_tree_remove (env->nodes_marked_new, v->uid);
-
- v_info->dfn_number = env->count;
- v_info->low_link = env->count;
- env->count++;
- env->stack[(env->stack_size)++] = v;
- v_info->on_stack = true;
-
- for (edge = v->callers; edge; edge = edge->next_caller)
- {
- struct dfs_info * w_info;
- struct cgraph_node *w = edge->caller;
- /* skip the nodes that we are supposed to ignore */
- if (w->aux)
- {
- w_info = w->aux;
- if (w_info->new)
- {
- searchc (env, w);
- v_info->low_link =
- (v_info->low_link < w_info->low_link) ?
- v_info->low_link : w_info->low_link;
- }
- else
- if ((w_info->dfn_number < v_info->dfn_number)
- && (w_info->on_stack))
- v_info->low_link =
- (w_info->dfn_number < v_info->low_link) ?
- w_info->dfn_number : v_info->low_link;
- }
- }
+ struct cgraph_node *node;
+ struct cgraph_node **order =
+ xcalloc (cgraph_n_nodes, sizeof (struct cgraph_node *));
+ int order_pos = 0, new_order_pos = 0;
+ int i;
+
+ order_pos = cgraph_postorder (order);
+ gcc_assert (order_pos == cgraph_n_nodes);
+ /* Garbage collector may remove inline clones we eliminate during
+ optimization. So we must be sure to not reference them. */
+ for (i = 0; i < order_pos; i++)
+ if (order[i]->output)
+ order[new_order_pos++] = order[i];
- if (v_info->low_link == v_info->dfn_number)
+ for (i = new_order_pos - 1; i >= 0; i--)
{
- struct cgraph_node *last = NULL;
- struct cgraph_node *x;
- struct dfs_info *x_info;
- do {
- x = env->stack[--(env->stack_size)];
- x_info = x->aux;
- x_info->on_stack = false;
-
- if (env->reduce)
- {
- x->next_cycle = last;
- last = x;
- }
- else
- env->result[env->order_pos++] = x;
- }
- while (v != x);
- if (env->reduce)
- env->result[env->order_pos++] = v;
+ node = order[i];
+ if (node->output)
+ {
+ gcc_assert (node->reachable);
+ node->output = 0;
+ cgraph_expand_function (node);
+ }
}
+ free (order);
}
-/* Topsort the call graph by caller relation. Put the result in ORDER.
+/* Mark visibility of all functions.
+
+ A local function is one whose calls can occur only in the current
+ compilation unit and all its calls are explicit, so we can change
+ its calling convention. We simply mark all static functions whose
+ address is not taken as local.
- The REDUCE flag is true if you want the cycles reduced to single
- nodes. Only consider nodes that have the output bit set. */
+ We also change the TREE_PUBLIC flag of all declarations that are public
+ in language point of view but we want to overwrite this default
+ via visibilities for the backend point of view. */
-static int
-cgraph_reduced_inorder (struct cgraph_node **order, bool reduce)
+static void
+cgraph_function_and_variable_visibility (void)
{
struct cgraph_node *node;
- struct searchc_env env;
- splay_tree_node result;
- env.stack = xcalloc (cgraph_n_nodes, sizeof (struct cgraph_node *));
- env.stack_size = 0;
- env.result = order;
- env.order_pos = 0;
- env.nodes_marked_new = splay_tree_new (splay_tree_compare_ints, 0, 0);
- env.count = 1;
- env.reduce = reduce;
-
+ struct cgraph_varpool_node *vnode;
+
for (node = cgraph_nodes; node; node = node->next)
- if (node->output)
- {
- struct dfs_info *info = xcalloc (1, sizeof (struct dfs_info));
- info->new = true;
- info->on_stack = false;
- node->aux = info;
- node->next_cycle = NULL;
-
- splay_tree_insert (env.nodes_marked_new,
- node->uid, (splay_tree_value)node);
- }
- else
- node->aux = NULL;
- result = splay_tree_min (env.nodes_marked_new);
- while (result)
{
- node = (struct cgraph_node *)result->value;
- searchc (&env, node);
- result = splay_tree_min (env.nodes_marked_new);
- }
- splay_tree_delete (env.nodes_marked_new);
- free (env.stack);
-
- for (node = cgraph_nodes; node; node = node->next)
- if (node->aux)
- {
- free (node->aux);
- node->aux = NULL;
- }
- return env.order_pos;
-}
-
-/* Perform reachability analysis and reclaim all unreachable nodes.
- This function also remove unneeded bodies of extern inline functions
- and thus needs to be done only after inlining decisions has been made. */
-static bool
-cgraph_remove_unreachable_nodes (void)
-{
- struct cgraph_node *first = (void *) 1;
- struct cgraph_node *node;
- bool changed = false;
- int insns = 0;
-
-#ifdef ENABLE_CHECKING
- verify_cgraph ();
-#endif
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, "\nReclaiming functions:");
-#ifdef ENABLE_CHECKING
- for (node = cgraph_nodes; node; node = node->next)
- gcc_assert (!node->aux);
-#endif
- for (node = cgraph_nodes; node; node = node->next)
- if (node->needed && !node->global.inlined_to
- && (!DECL_EXTERNAL (node->decl) || !node->analyzed))
- {
- node->aux = first;
- first = node;
- }
- else
- gcc_assert (!node->aux);
-
- /* Perform reachability analysis. As a special case do not consider
- extern inline functions not inlined as live because we won't output
- them at all. */
- while (first != (void *) 1)
- {
- struct cgraph_edge *e;
- node = first;
- first = first->aux;
-
- for (e = node->callees; e; e = e->next_callee)
- if (!e->callee->aux
- && node->analyzed
- && (!e->inline_failed || !e->callee->analyzed
- || !DECL_EXTERNAL (e->callee->decl)))
- {
- e->callee->aux = first;
- first = e->callee;
- }
- }
-
- /* Remove unreachable nodes. Extern inline functions need special care;
- Unreachable extern inline functions shall be removed.
- Reachable extern inline functions we never inlined shall get their bodies
- eliminated.
- Reachable extern inline functions we sometimes inlined will be turned into
- unanalyzed nodes so they look like for true extern functions to the rest
- of code. Body of such functions is released via remove_node once the
- inline clones are eliminated. */
- for (node = cgraph_nodes; node; node = node->next)
- {
- if (!node->aux)
- {
- int local_insns;
- tree decl = node->decl;
-
- node->global.inlined_to = NULL;
- if (DECL_STRUCT_FUNCTION (decl))
- local_insns = node->local.self_insns;
- else
- local_insns = 0;
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, " %s", cgraph_node_name (node));
- if (!node->analyzed || !DECL_EXTERNAL (node->decl))
- cgraph_remove_node (node);
- else
- {
- struct cgraph_edge *e;
-
- for (e = node->callers; e; e = e->next_caller)
- if (e->caller->aux)
- break;
- if (e || node->needed)
- {
- struct cgraph_node *clone;
-
- for (clone = node->next_clone; clone;
- clone = clone->next_clone)
- if (clone->aux)
- break;
- if (!clone)
- {
- DECL_SAVED_TREE (node->decl) = NULL;
- DECL_STRUCT_FUNCTION (node->decl) = NULL;
- DECL_INITIAL (node->decl) = error_mark_node;
- }
- while (node->callees)
- cgraph_remove_edge (node->callees);
- node->analyzed = false;
- }
- else
- cgraph_remove_node (node);
- }
- if (!DECL_SAVED_TREE (decl))
- insns += local_insns;
- changed = true;
- }
- }
- for (node = cgraph_nodes; node; node = node->next)
- node->aux = NULL;
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, "\nReclaimed %i insns", insns);
- return changed;
-}
-
-/* Estimate size of the function after inlining WHAT into TO. */
-
-static int
-cgraph_estimate_size_after_inlining (int times, struct cgraph_node *to,
- struct cgraph_node *what)
-{
- return (what->global.insns - INSNS_PER_CALL) * times + to->global.insns;
-}
-
-/* Estimate the growth caused by inlining NODE into all callees. */
-
-static int
-cgraph_estimate_growth (struct cgraph_node *node)
-{
- int growth = 0;
- struct cgraph_edge *e;
-
- for (e = node->callers; e; e = e->next_caller)
- if (e->inline_failed)
- growth += (cgraph_estimate_size_after_inlining (1, e->caller, node)
- - e->caller->global.insns);
-
- /* ??? Wrong for self recursive functions or cases where we decide to not
- inline for different reasons, but it is not big deal as in that case
- we will keep the body around, but we will also avoid some inlining. */
- if (!node->needed && !DECL_EXTERNAL (node->decl))
- growth -= node->global.insns;
-
- return growth;
-}
-
-/* E is expected to be an edge being inlined. Clone destination node of
- the edge and redirect it to the new clone.
- DUPLICATE is used for bookkeeping on whether we are actually creating new
- clones or re-using node originally representing out-of-line function call.
- */
-void
-cgraph_clone_inlined_nodes (struct cgraph_edge *e, bool duplicate)
-{
- struct cgraph_node *n;
-
- /* We may eliminate the need for out-of-line copy to be output. In that
- case just go ahead and re-use it. */
- if (!e->callee->callers->next_caller
- && (!e->callee->needed || DECL_EXTERNAL (e->callee->decl))
- && duplicate
- && flag_unit_at_a_time)
- {
- gcc_assert (!e->callee->global.inlined_to);
- if (!DECL_EXTERNAL (e->callee->decl))
- overall_insns -= e->callee->global.insns, nfunctions_inlined++;
- duplicate = 0;
- }
- else if (duplicate)
- {
- n = cgraph_clone_node (e->callee);
- cgraph_redirect_edge_callee (e, n);
- }
-
- if (e->caller->global.inlined_to)
- e->callee->global.inlined_to = e->caller->global.inlined_to;
- else
- e->callee->global.inlined_to = e->caller;
-
- /* Recursively clone all bodies. */
- for (e = e->callee->callees; e; e = e->next_callee)
- if (!e->inline_failed)
- cgraph_clone_inlined_nodes (e, duplicate);
-}
-
-/* Mark edge E as inlined and update callgraph accordingly. */
-
-void
-cgraph_mark_inline_edge (struct cgraph_edge *e)
-{
- int old_insns = 0, new_insns = 0;
- struct cgraph_node *to = NULL, *what;
-
- gcc_assert (e->inline_failed);
- e->inline_failed = NULL;
-
- if (!e->callee->global.inlined && flag_unit_at_a_time)
- DECL_POSSIBLY_INLINED (e->callee->decl) = true;
- e->callee->global.inlined = true;
-
- cgraph_clone_inlined_nodes (e, true);
-
- what = e->callee;
-
- /* Now update size of caller and all functions caller is inlined into. */
- for (;e && !e->inline_failed; e = e->caller->callers)
- {
- old_insns = e->caller->global.insns;
- new_insns = cgraph_estimate_size_after_inlining (1, e->caller,
- what);
- gcc_assert (new_insns >= 0);
- to = e->caller;
- to->global.insns = new_insns;
- }
- gcc_assert (what->global.inlined_to == to);
- overall_insns += new_insns - old_insns;
- ncalls_inlined++;
-}
-
-/* Mark all calls of EDGE->CALLEE inlined into EDGE->CALLER.
- Return following unredirected edge in the list of callers
- of EDGE->CALLEE */
-
-static struct cgraph_edge *
-cgraph_mark_inline (struct cgraph_edge *edge)
-{
- struct cgraph_node *to = edge->caller;
- struct cgraph_node *what = edge->callee;
- struct cgraph_edge *e, *next;
- int times = 0;
-
- /* Look for all calls, mark them inline and clone recursively
- all inlined functions. */
- for (e = what->callers; e; e = next)
- {
- next = e->next_caller;
- if (e->caller == to && e->inline_failed)
- {
- cgraph_mark_inline_edge (e);
- if (e == edge)
- edge = next;
- times++;
- }
- }
- gcc_assert (times);
- return edge;
-}
-
-/* Return false when inlining WHAT into TO is not good idea
- as it would cause too large growth of function bodies. */
-
-static bool
-cgraph_check_inline_limits (struct cgraph_node *to, struct cgraph_node *what,
- const char **reason)
-{
- int times = 0;
- struct cgraph_edge *e;
- int newsize;
- int limit;
-
- if (to->global.inlined_to)
- to = to->global.inlined_to;
-
- for (e = to->callees; e; e = e->next_callee)
- if (e->callee == what)
- times++;
-
- /* When inlining large function body called once into small function,
- take the inlined function as base for limiting the growth. */
- if (to->local.self_insns > what->local.self_insns)
- limit = to->local.self_insns;
- else
- limit = what->local.self_insns;
-
- limit += limit * PARAM_VALUE (PARAM_LARGE_FUNCTION_GROWTH) / 100;
-
- newsize = cgraph_estimate_size_after_inlining (times, to, what);
- if (newsize > PARAM_VALUE (PARAM_LARGE_FUNCTION_INSNS)
- && newsize > limit)
- {
- if (reason)
- *reason = N_("--param large-function-growth limit reached");
- return false;
- }
- return true;
-}
-
-/* Return true when function N is small enough to be inlined. */
-
-static bool
-cgraph_default_inline_p (struct cgraph_node *n)
-{
- if (!DECL_INLINE (n->decl) || !DECL_SAVED_TREE (n->decl))
- return false;
- if (DECL_DECLARED_INLINE_P (n->decl))
- return n->global.insns < MAX_INLINE_INSNS_SINGLE;
- else
- return n->global.insns < MAX_INLINE_INSNS_AUTO;
-}
-
-/* Return true when inlining WHAT would create recursive inlining.
- We call recursive inlining all cases where same function appears more than
- once in the single recursion nest path in the inline graph. */
-
-static bool
-cgraph_recursive_inlining_p (struct cgraph_node *to,
- struct cgraph_node *what,
- const char **reason)
-{
- bool recursive;
- if (to->global.inlined_to)
- recursive = what->decl == to->global.inlined_to->decl;
- else
- recursive = what->decl == to->decl;
- /* Marking recursive function inline has sane semantic and thus we should
- not warn on it. */
- if (recursive && reason)
- *reason = (what->local.disregard_inline_limits
- ? N_("recursive inlining") : "");
- return recursive;
-}
-
-/* Recompute heap nodes for each of callees. */
-static void
-update_callee_keys (fibheap_t heap, struct fibnode **heap_node,
- struct cgraph_node *node)
-{
- struct cgraph_edge *e;
-
- for (e = node->callees; e; e = e->next_callee)
- if (e->inline_failed && heap_node[e->callee->uid])
- fibheap_replace_key (heap, heap_node[e->callee->uid],
- cgraph_estimate_growth (e->callee));
- else if (!e->inline_failed)
- update_callee_keys (heap, heap_node, e->callee);
-}
-
-/* Enqueue all recursive calls from NODE into queue linked via aux pointers
- in between FIRST and LAST. WHERE is used for bookkeeping while looking
- int calls inlined within NODE. */
-static void
-lookup_recursive_calls (struct cgraph_node *node, struct cgraph_node *where,
- struct cgraph_edge **first, struct cgraph_edge **last)
-{
- struct cgraph_edge *e;
- for (e = where->callees; e; e = e->next_callee)
- if (e->callee == node)
- {
- if (!*first)
- *first = e;
- else
- (*last)->aux = e;
- *last = e;
- }
- for (e = where->callees; e; e = e->next_callee)
- if (!e->inline_failed)
- lookup_recursive_calls (node, e->callee, first, last);
-}
-
-/* Decide on recursive inlining: in the case function has recursive calls,
- inline until body size reaches given argument. */
-static void
-cgraph_decide_recursive_inlining (struct cgraph_node *node)
-{
- int limit = PARAM_VALUE (PARAM_MAX_INLINE_INSNS_RECURSIVE_AUTO);
- int max_depth = PARAM_VALUE (PARAM_MAX_INLINE_RECURSIVE_DEPTH_AUTO);
- struct cgraph_edge *first_call = NULL, *last_call = NULL;
- struct cgraph_edge *last_in_current_depth;
- struct cgraph_edge *e;
- struct cgraph_node *master_clone;
- int depth = 0;
- int n = 0;
-
- if (DECL_DECLARED_INLINE_P (node->decl))
- {
- limit = PARAM_VALUE (PARAM_MAX_INLINE_INSNS_RECURSIVE);
- max_depth = PARAM_VALUE (PARAM_MAX_INLINE_RECURSIVE_DEPTH);
- }
-
- /* Make sure that function is small enough to be considered for inlining. */
- if (!max_depth
- || cgraph_estimate_size_after_inlining (1, node, node) >= limit)
- return;
- lookup_recursive_calls (node, node, &first_call, &last_call);
- if (!first_call)
- return;
-
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- "\nPerforming recursive inlining on %s\n",
- cgraph_node_name (node));
-
- /* We need original clone to copy around. */
- master_clone = cgraph_clone_node (node);
- master_clone->needed = true;
- for (e = master_clone->callees; e; e = e->next_callee)
- if (!e->inline_failed)
- cgraph_clone_inlined_nodes (e, true);
-
- /* Do the inlining and update list of recursive call during process. */
- last_in_current_depth = last_call;
- while (first_call
- && cgraph_estimate_size_after_inlining (1, node, master_clone) <= limit)
- {
- struct cgraph_edge *curr = first_call;
-
- first_call = first_call->aux;
- curr->aux = NULL;
-
- cgraph_redirect_edge_callee (curr, master_clone);
- cgraph_mark_inline_edge (curr);
- lookup_recursive_calls (node, curr->callee, &first_call, &last_call);
-
- if (last_in_current_depth
- && ++depth >= max_depth)
- break;
- n++;
- }
-
- /* Cleanup queue pointers. */
- while (first_call)
- {
- struct cgraph_edge *next = first_call->aux;
- first_call->aux = NULL;
- first_call = next;
- }
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- "\n Inlined %i times, body grown from %i to %i insns\n", n,
- master_clone->global.insns, node->global.insns);
-
- /* Remove master clone we used for inlining. We rely that clones inlined
- into master clone gets queued just before master clone so we don't
- need recursion. */
- for (node = cgraph_nodes; node != master_clone;
- node = node->next)
- if (node->global.inlined_to == master_clone)
- cgraph_remove_node (node);
- cgraph_remove_node (master_clone);
-}
-
-/* Set inline_failed for all callers of given function to REASON. */
-
-static void
-cgraph_set_inline_failed (struct cgraph_node *node, const char *reason)
-{
- struct cgraph_edge *e;
-
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, "Inlining failed: %s\n", reason);
- for (e = node->callers; e; e = e->next_caller)
- if (e->inline_failed)
- e->inline_failed = reason;
-}
-
-/* We use greedy algorithm for inlining of small functions:
- All inline candidates are put into prioritized heap based on estimated
- growth of the overall number of instructions and then update the estimates.
-
- INLINED and INLINED_CALEES are just pointers to arrays large enough
- to be passed to cgraph_inlined_into and cgraph_inlined_callees. */
-
-static void
-cgraph_decide_inlining_of_small_functions (void)
-{
- struct cgraph_node *node;
- fibheap_t heap = fibheap_new ();
- struct fibnode **heap_node =
- xcalloc (cgraph_max_uid, sizeof (struct fibnode *));
- int max_insns = ((HOST_WIDEST_INT) initial_insns
- * (100 + PARAM_VALUE (PARAM_INLINE_UNIT_GROWTH)) / 100);
-
- /* Put all inline candidates into the heap. */
-
- for (node = cgraph_nodes; node; node = node->next)
- {
- if (!node->local.inlinable || !node->callers
- || node->local.disregard_inline_limits)
- continue;
-
- if (!cgraph_default_inline_p (node))
- {
- cgraph_set_inline_failed (node,
- N_("--param max-inline-insns-single limit reached"));
- continue;
- }
- heap_node[node->uid] =
- fibheap_insert (heap, cgraph_estimate_growth (node), node);
- }
-
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, "\nDeciding on smaller functions:\n");
- while (overall_insns <= max_insns && (node = fibheap_extract_min (heap)))
- {
- struct cgraph_edge *e, *next;
- int old_insns = overall_insns;
-
- heap_node[node->uid] = NULL;
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- "\nConsidering %s with %i insns\n"
- " Estimated growth is %+i insns.\n",
- cgraph_node_name (node), node->global.insns,
- cgraph_estimate_growth (node));
- if (!cgraph_default_inline_p (node))
- {
- cgraph_set_inline_failed (node,
- N_("--param max-inline-insns-single limit reached after inlining into the callee"));
- continue;
- }
- for (e = node->callers; e; e = next)
- {
- next = e->next_caller;
- if (e->inline_failed)
- {
- struct cgraph_node *where;
-
- if (cgraph_recursive_inlining_p (e->caller, e->callee,
- &e->inline_failed)
- || !cgraph_check_inline_limits (e->caller, e->callee,
- &e->inline_failed))
- {
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, " Not inlining into %s:%s.\n",
- cgraph_node_name (e->caller), e->inline_failed);
- continue;
- }
- next = cgraph_mark_inline (e);
- where = e->caller;
- if (where->global.inlined_to)
- where = where->global.inlined_to;
-
- if (heap_node[where->uid])
- fibheap_replace_key (heap, heap_node[where->uid],
- cgraph_estimate_growth (where));
-
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- " Inlined into %s which now has %i insns.\n",
- cgraph_node_name (e->caller),
- e->caller->global.insns);
- }
- }
-
- cgraph_decide_recursive_inlining (node);
-
- /* Similarly all functions called by the function we just inlined
- are now called more times; update keys. */
- update_callee_keys (heap, heap_node, node);
-
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- " Inlined for a net change of %+i insns.\n",
- overall_insns - old_insns);
- }
- while ((node = fibheap_extract_min (heap)) != NULL)
- if (!node->local.disregard_inline_limits)
- cgraph_set_inline_failed (node, N_("--param inline-unit-growth limit reached"));
- fibheap_delete (heap);
- free (heap_node);
-}
-
-/* Decide on the inlining. We do so in the topological order to avoid
- expenses on updating data structures. */
-
-static void
-cgraph_decide_inlining (void)
-{
- struct cgraph_node *node;
- int nnodes;
- struct cgraph_node **order =
- xcalloc (cgraph_n_nodes, sizeof (struct cgraph_node *));
- int old_insns = 0;
- int i;
-
- for (node = cgraph_nodes; node; node = node->next)
- initial_insns += node->local.self_insns;
- overall_insns = initial_insns;
-
- nnodes = cgraph_postorder (order);
-
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- "\nDeciding on inlining. Starting with %i insns.\n",
- initial_insns);
-
- for (node = cgraph_nodes; node; node = node->next)
- node->aux = 0;
-
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, "\nInlining always_inline functions:\n");
-
- /* In the first pass mark all always_inline edges. Do this with a priority
- so none of our later choices will make this impossible. */
- for (i = nnodes - 1; i >= 0; i--)
- {
- struct cgraph_edge *e, *next;
-
- node = order[i];
-
- if (!node->local.disregard_inline_limits)
- continue;
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- "\nConsidering %s %i insns (always inline)\n",
- cgraph_node_name (node), node->global.insns);
- old_insns = overall_insns;
- for (e = node->callers; e; e = next)
- {
- next = e->next_caller;
- if (!e->inline_failed)
- continue;
- if (cgraph_recursive_inlining_p (e->caller, e->callee,
- &e->inline_failed))
- continue;
- cgraph_mark_inline_edge (e);
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- " Inlined into %s which now has %i insns.\n",
- cgraph_node_name (e->caller),
- e->caller->global.insns);
- }
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- " Inlined for a net change of %+i insns.\n",
- overall_insns - old_insns);
- }
-
- if (!flag_really_no_inline)
- {
- cgraph_decide_inlining_of_small_functions ();
-
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, "\nDeciding on functions called once:\n");
-
- /* And finally decide what functions are called once. */
-
- for (i = nnodes - 1; i >= 0; i--)
- {
- node = order[i];
-
- if (node->callers && !node->callers->next_caller && !node->needed
- && node->local.inlinable && node->callers->inline_failed
- && !DECL_EXTERNAL (node->decl) && !DECL_COMDAT (node->decl))
- {
- bool ok = true;
- struct cgraph_node *node1;
-
- /* Verify that we won't duplicate the caller. */
- for (node1 = node->callers->caller;
- node1->callers && !node1->callers->inline_failed
- && ok; node1 = node1->callers->caller)
- if (node1->callers->next_caller || node1->needed)
- ok = false;
- if (ok)
- {
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- "\nConsidering %s %i insns.\n"
- " Called once from %s %i insns.\n",
- cgraph_node_name (node), node->global.insns,
- cgraph_node_name (node->callers->caller),
- node->callers->caller->global.insns);
-
- old_insns = overall_insns;
-
- if (cgraph_check_inline_limits (node->callers->caller, node,
- NULL))
- {
- cgraph_mark_inline (node->callers);
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- " Inlined into %s which now has %i insns"
- " for a net change of %+i insns.\n",
- cgraph_node_name (node->callers->caller),
- node->callers->caller->global.insns,
- overall_insns - old_insns);
- }
- else
- {
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- " Inline limit reached, not inlined.\n");
- }
- }
- }
- }
- }
-
- /* We will never output extern functions we didn't inline.
- ??? Perhaps we can prevent accounting of growth of external
- inline functions. */
- cgraph_remove_unreachable_nodes ();
-
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file,
- "\nInlined %i calls, eliminated %i functions, "
- "%i insns turned to %i insns.\n\n",
- ncalls_inlined, nfunctions_inlined, initial_insns,
- overall_insns);
- free (order);
-}
-
-/* Decide on the inlining. We do so in the topological order to avoid
- expenses on updating data structures. */
-
-static void
-cgraph_decide_inlining_incrementally (struct cgraph_node *node)
-{
- struct cgraph_edge *e;
-
- /* First of all look for always inline functions. */
- for (e = node->callees; e; e = e->next_callee)
- if (e->callee->local.disregard_inline_limits
- && e->inline_failed
- && !cgraph_recursive_inlining_p (node, e->callee, &e->inline_failed)
- /* ??? It is possible that renaming variable removed the function body
- in duplicate_decls. See gcc.c-torture/compile/20011119-2.c */
- && DECL_SAVED_TREE (e->callee->decl))
- cgraph_mark_inline (e);
-
- /* Now do the automatic inlining. */
- if (!flag_really_no_inline)
- for (e = node->callees; e; e = e->next_callee)
- if (e->callee->local.inlinable
- && e->inline_failed
- && !e->callee->local.disregard_inline_limits
- && !cgraph_recursive_inlining_p (node, e->callee, &e->inline_failed)
- && cgraph_check_inline_limits (node, e->callee, &e->inline_failed)
- && DECL_SAVED_TREE (e->callee->decl))
- {
- if (cgraph_default_inline_p (e->callee))
- cgraph_mark_inline (e);
- else
- e->inline_failed
- = N_("--param max-inline-insns-single limit reached");
- }
-}
-
-
-/* Return true when CALLER_DECL should be inlined into CALLEE_DECL. */
-
-bool
-cgraph_inline_p (struct cgraph_edge *e, const char **reason)
-{
- *reason = e->inline_failed;
- return !e->inline_failed;
-}
-
-/* FIXME this needs to be enhanced. If we are compiling a single
- module this returns true if the variable is a module level static,
- but if we are doing whole program compilation, this could return
- true if TREE_PUBLIC is true. */
-/* Return true if the variable T is the right kind of static variable to
- perform compilation unit scope escape analysis. */
-
-static inline
-bool has_proper_scope_for_analysis (tree t)
-{
- return (TREE_STATIC(t)) && !(TREE_PUBLIC(t)) && !(TREE_THIS_VOLATILE(t));
-}
-
-/* Check to see if T is a read or address of operation on a static var
- we are interested in analyzing. FN is passed in to get access to
- its bit vectors. */
-
-static void
-check_rhs_var (struct cgraph_node *fn, tree t)
-{
- if (TREE_CODE (t) == ADDR_EXPR)
- {
- tree x = TREE_OPERAND (t, 0);
- if ((TREE_CODE (x) == VAR_DECL) && has_proper_scope_for_analysis (x))
- {
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, "\nadding address:%s",
- lang_hooks.decl_printable_name (x, 2));
-
- /* FIXME -- PROFILE-RESTRUCTURE: Change the call from
- DECL_UID to get the uid from the var_ann field. */
- bitmap_set_bit (module_statics_escape, DECL_UID (x));
- }
- }
- t = get_base_address (t);
- if (!t) return;
- if ((TREE_CODE (t) == VAR_DECL) && has_proper_scope_for_analysis (t))
- {
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, "\nadding rhs:%s",
- lang_hooks.decl_printable_name (t, 2));
- /* FIXME -- PROFILE-RESTRUCTURE: Change the call from
- DECL_UID to get the uid from the var_ann field. */
- bitmap_set_bit (fn->static_vars_info->local->statics_read_by_decl_uid,
- DECL_UID (t));
- }
-}
-
-/* Check to see if T is an assignment to a static var we are
- interrested in analyzing. FN is passed in to get access to its bit
- vectors.
-*/
-
-static void
-check_lhs_var (struct cgraph_node *fn, tree t)
-{
- t = get_base_address (t);
- if (!t) return;
- if ((TREE_CODE (t) == VAR_DECL) && has_proper_scope_for_analysis (t))
- {
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, "\nadding lhs:%s",
- lang_hooks.decl_printable_name (t, 2));
-
- /* FIXME -- PROFILE-RESTRUCTURE: Change the call from
- DECL_UID to get the uid from the var_ann field. */
- bitmap_set_bit (fn->static_vars_info->local->statics_written_by_decl_uid,
- DECL_UID (t));
- }
-}
-
-/* This is a scaled down version of get_asm_expr_operands from
- tree_ssa_operands.c. The version there runs much later and assumes
- that aliasing information is already available. Here we are just
- trying to find if the set of inputs and outputs contain references
- or address of operations to local static variables. FN is the
- function being analyzed and STMT is the actual asm statement. */
-
-static void
-get_asm_expr_operands (struct cgraph_node * fn, tree stmt)
-{
- int noutputs = list_length (ASM_OUTPUTS (stmt));
- const char **oconstraints
- = (const char **) alloca ((noutputs) * sizeof (const char *));
- int i;
- tree link;
- const char *constraint;
- bool allows_mem, allows_reg, is_inout;
-
- for (i=0, link = ASM_OUTPUTS (stmt); link; ++i, link = TREE_CHAIN (link))
- {
- oconstraints[i] = constraint
- = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
- parse_output_constraint (&constraint, i, 0, 0,
- &allows_mem, &allows_reg, &is_inout);
-
- /* Memory operands are addressable. Note that STMT needs the
- address of this operand. */
- if (!allows_reg && allows_mem)
- {
- check_lhs_var (fn, TREE_VALUE (link));
- }
- }
-
- for (link = ASM_INPUTS (stmt); link; link = TREE_CHAIN (link))
- {
- constraint
- = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
- parse_input_constraint (&constraint, 0, 0, noutputs, 0,
- oconstraints, &allows_mem, &allows_reg);
-
- /* Memory operands are addressable. Note that STMT needs the
- address of this operand. */
- if (!allows_reg && allows_mem)
- {
- check_rhs_var (fn, TREE_VALUE (link));
- }
- }
-
- for (link = ASM_CLOBBERS (stmt); link; link = TREE_CHAIN (link))
- if (TREE_VALUE (link) == memory_identifier)
- {
- /* Abandon all hope, ye who enter here. */
- local_static_vars_info_t l = fn->static_vars_info->local;
- bitmap_a_or_b (l->statics_read_by_decl_uid,
- l->statics_read_by_decl_uid,
- all_module_statics);
- bitmap_a_or_b (l->statics_written_by_decl_uid,
- l->statics_written_by_decl_uid,
- all_module_statics);
-
- }
-}
-
-/* Check the parameters of a function call from CALLER to CALL_EXPR to
- see if any of them are static vars. Also check to see if this is
- either an indirect call, a call outside the compilation unit, or
- has special attributes that effect the clobbers. The caller
- parameter is the tree node for the caller and the second operand is
- the tree node for the entire call expression. */
-static void
-process_call_for_static_vars(struct cgraph_node * caller, tree call_expr)
-{
- int flags = call_expr_flags(call_expr);
- tree operandList = TREE_OPERAND (call_expr, 1);
- tree operand;
-
- for (operand = operandList;
- operand != NULL_TREE;
- operand = TREE_CHAIN (operand))
- {
- tree argument = TREE_VALUE (operand);
- check_rhs_var (caller, argument);
- }
-
- /* Const and pure functions have less clobber effects than other
- functions so we process these first. Otherwise if it is a call
- outside the compilation unit or an indirect call we punt. This
- leaves local calls which will be processed by following the call
- graph. */
- if (flags & ECF_CONST)
- return;
- else if (flags & ECF_PURE)
- caller->local.calls_write_all = true;
- else
- {
- tree callee_t = get_callee_fndecl (call_expr);
- if (callee_t == NULL)
- {
- /* Indirect call. */
- caller->local.calls_read_all = true;
- caller->local.calls_write_all = true;
- }
- else
- {
- struct cgraph_node* callee = cgraph_node(callee_t);
-
- if (callee->local.external)
- {
- caller->local.calls_read_all = true;
- caller->local.calls_write_all = true;
- }
- }
- }
-}
-
-/* FIXME -- PROFILE-RESTRUCTURE: Change to walk by explicitly walking
- the basic blocks rather than calling walktree. */
-
-/* Walk tree and record all calls. Called via walk_tree. FIXME When
- this is moved into the tree-profiling-branch, and is dealing with
- low GIMPLE, this routine should be changed to use tree iterators
- rather than being a walk_tree callback. The data is the function
- that is being scanned. */
-/* TP is the part of the tree currently under the
- microscope. WALK_SUBTREES is part of the walk_tree api but is
- unused here. DATA is cgraph_node of the function being walked. */
-
-static tree
-scan_for_static_refs (tree *tp,
- int *walk_subtrees ATTRIBUTE_UNUSED,
- void *data)
-{
- struct cgraph_node *fn = data;
- tree t = *tp;
-
- switch (TREE_CODE (t))
- {
- case MODIFY_EXPR:
- {
- /* First look on the lhs and see what variable is stored to */
- tree rhs = TREE_OPERAND (t, 1);
- check_lhs_var (fn, TREE_OPERAND (t, 0));
- /* Next check the operands on the rhs to see if they are ok. */
- switch (TREE_CODE_CLASS (TREE_CODE (rhs))) {
- case tcc_binary:
- check_rhs_var (fn, TREE_OPERAND (rhs, 0));
- check_rhs_var (fn, TREE_OPERAND (rhs, 1));
- break;
- case tcc_unary:
- case tcc_reference:
- check_rhs_var (fn, TREE_OPERAND (rhs, 0));
- break;
- case tcc_declaration:
- check_rhs_var (fn, rhs);
- break;
- case tcc_expression:
- switch (TREE_CODE (rhs)) {
- case ADDR_EXPR:
- check_rhs_var (fn, rhs);
- break;
- case CALL_EXPR:
- process_call_for_static_vars (fn, rhs);
- break;
- default:
- break;
- }
- break;
- default:
- break;
- }
- }
- break;
-
-
- case CALL_EXPR:
- process_call_for_static_vars (fn, t);
- break;
-
- case ASM_EXPR:
- get_asm_expr_operands (fn, t);
- break;
-
- default:
- break;
- }
- return NULL;
-}
-
-
-/* This is the main routine for finding the reference patterns for
- global variables within a function FN */
- static void
-cgraph_characterize_statics_local (struct cgraph_node *fn)
-{
- tree decl = fn->decl;
- static_vars_info_t info = new_static_vars_info(fn, false);
- local_static_vars_info_t l = info->local;
-
-
- /* The nodes we're interested in are never shared, so walk
- the tree ignoring duplicates. */
- visited_nodes = htab_create (37, htab_hash_pointer,
- htab_eq_pointer, NULL);
-
- /* FIXME -- PROFILE-RESTRUCTURE: Remove creation of _decl_uid vars. */
- l->statics_read_by_decl_uid = BITMAP_GGC_ALLOC ();
- l->statics_written_by_decl_uid = BITMAP_GGC_ALLOC ();
-
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, "\n local analysis of %s", cgraph_node_name (fn));
-
- walk_tree (&DECL_SAVED_TREE (decl), scan_for_static_refs, fn, visited_nodes);
- htab_delete (visited_nodes);
- visited_nodes = NULL;
-}
-
-/* Lookup the tree node for the static variable that has UID and
- conver the name to a string for debugging. */
-static const char *
-cgraph_get_static_name_by_uid (int index)
-{
- splay_tree_node stn = splay_tree_lookup (static_vars_to_consider_by_uid, index);
- if (stn)
- return lang_hooks.decl_printable_name ((tree)(stn->value), 2);
- return NULL;
-}
-
-/* Clear out any the static variable with uid INDEX from further
- consideration because it escapes (i.e. has had its address
- taken). */
-static void
-clear_static_vars_maps (int index)
-{
- splay_tree_node stn = splay_tree_lookup (static_vars_to_consider_by_uid, index);
- if (stn)
- {
- splay_tree_remove (static_vars_to_consider_by_tree, stn->value);
- splay_tree_remove (static_vars_to_consider_by_uid, index);
- }
-}
-
-/* FIXME -- PROFILE-RESTRUCTURE: Change all *_decl_uid to *_ann_uid. */
-
-/* Or in all of the bits from every callee into X, the caller's, bit
- vector. There are several cases to check to avoid the sparse
- bitmap oring. */
-static void
-cgraph_propagate_bits (struct cgraph_node *x)
-{
- static_vars_info_t x_info = x->static_vars_info;
- global_static_vars_info_t x_global = x_info->global;
-
- struct cgraph_edge *e;
- for (e = x->callees; e; e = e->next_callee)
- {
- struct cgraph_node *y = e->callee;
-
- /* We are only going to look at edges that point to nodes that
- have their output bit set. */
- if (y->output)
- {
- static_vars_info_t y_info;
- global_static_vars_info_t y_global;
- y_info = y->static_vars_info;
- y_global = y_info->global;
-
- if (x_global->statics_read_by_decl_uid != all_module_statics)
- {
- if (y_global->statics_read_by_decl_uid == all_module_statics)
- x_global->statics_read_by_decl_uid = all_module_statics;
- /* Skip bitmaps that are pointer equal to node's bitmap
- (no reason to spin within the cycle). */
- else if (x_global->statics_read_by_decl_uid != y_global->statics_read_by_decl_uid)
- bitmap_a_or_b (x_global->statics_read_by_decl_uid,
- x_global->statics_read_by_decl_uid,
- y_global->statics_read_by_decl_uid);
- }
-
- if (x_global->statics_written_by_decl_uid != all_module_statics)
- {
- if (y_global->statics_written_by_decl_uid == all_module_statics)
- x_global->statics_written_by_decl_uid = all_module_statics;
- /* Skip bitmaps that are pointer equal to node's bitmap
- (no reason to spin within the cycle). */
- else if (x_global->statics_written_by_decl_uid != y_global->statics_written_by_decl_uid)
- bitmap_a_or_b (x_global->statics_written_by_decl_uid,
- x_global->statics_written_by_decl_uid,
- y_global->statics_written_by_decl_uid);
- }
- }
- }
-}
-
-/* FIXME -- PROFILE-RESTRUCTURE: Change all *_decl_uid to *_ann_uid
- except where noted below. */
-
-/* The main routine for analyzing global static variable usage. See
- comments at top for description. */
-
-static void
-cgraph_characterize_statics (void)
-{
- struct cgraph_node *node;
- struct cgraph_node *w;
- struct cgraph_node **order =
- xcalloc (cgraph_n_nodes, sizeof (struct cgraph_node *));
- int order_pos = 0;
- int i;
-
- struct cgraph_varpool_node *vnode;
- tree global;
-
- /* get rid of the splay trees from the previous compilation unit. */
-
- static_vars_to_consider_by_tree =
- splay_tree_new_ggc (splay_tree_compare_pointers);
- static_vars_to_consider_by_uid =
- splay_tree_new_ggc (splay_tree_compare_ints);
-
- if (module_statics_escape)
- {
- bitmap_clear (module_statics_escape);
- bitmap_clear (all_module_statics);
- }
- else
- {
- module_statics_escape = BITMAP_XMALLOC ();
- all_module_statics = BITMAP_GGC_ALLOC ();
+ if (node->reachable
+ && (DECL_COMDAT (node->decl)
+ || (TREE_PUBLIC (node->decl) && !DECL_EXTERNAL (node->decl))))
+ node->local.externally_visible = 1;
+ node->local.local = (!node->needed
+ && node->analyzed
+ && !DECL_EXTERNAL (node->decl)
+ && !node->local.externally_visible);
}
-
- /* Find all of the global variables that we wish to analyze. */
for (vnode = cgraph_varpool_nodes_queue; vnode; vnode = vnode->next_needed)
{
- global = vnode->decl;
- if ((TREE_CODE (global) == VAR_DECL) &&
- has_proper_scope_for_analysis (global))
- {
- splay_tree_insert (static_vars_to_consider_by_tree,
- (splay_tree_key) global,
- (splay_tree_value) global);
- /* FIXME -- PROFILE-RESTRUCTURE: Change the call from
- DECL_UID to get the uid from the var_ann field. */
- splay_tree_insert (static_vars_to_consider_by_uid,
- DECL_UID (global), (splay_tree_value)global);
-
- if (cgraph_dump_file)
- fprintf (cgraph_dump_file, "\nConsidering global:%s",
- lang_hooks.decl_printable_name (global, 2));
- /* FIXME -- PROFILE-RESTRUCTURE: Change the call from
- DECL_UID to get the uid from the var_ann field. */
- bitmap_set_bit (all_module_statics, DECL_UID (global));
- }
- }
-
- order_pos = cgraph_reduced_inorder (order, false);
- if (cgraph_dump_file)
- print_order("new", order, order_pos);
-
- for (i = order_pos - 1; i >= 0; i--)
- {
- node = order[i];
-
- /* Scan each function to determine the variable usage
- patterns. */
- cgraph_characterize_statics_local (node);
- }
-
- /* Prune out the variables that were found to behave badly
- (i.e. have there address taken). */
- {
- int index;
- bitmap_iterator bi;
-
- EXECUTE_IF_SET_IN_BITMAP (module_statics_escape, 0, index, bi)
- {
- clear_static_vars_maps (index);
- }
- bitmap_operation (all_module_statics, all_module_statics,
- module_statics_escape, BITMAP_AND_COMPL);
-
- for (i = order_pos - 1; i >= 0; i--)
- {
- local_static_vars_info_t l;
- node = order[i];
- l = node->static_vars_info->local;
-
- bitmap_operation (l->statics_read_by_decl_uid,
- l->statics_read_by_decl_uid,
- module_statics_escape,
- BITMAP_AND_COMPL);
- bitmap_operation (l->statics_written_by_decl_uid,
- l->statics_written_by_decl_uid,
- module_statics_escape,
- BITMAP_AND_COMPL);
- }
- }
-
- if (cgraph_dump_file)
- {
- for (i = order_pos - 1; i >= 0; i--)
- {
- int index;
- local_static_vars_info_t l;
- bitmap_iterator bi;
-
- node = order[i];
- l = node->static_vars_info->local;
- fprintf (cgraph_dump_file,
- "\nFunction name:%s/%i:",
- cgraph_node_name (node), node->uid);
- fprintf (cgraph_dump_file, "\n locals read: ");
- EXECUTE_IF_SET_IN_BITMAP (l->statics_read_by_decl_uid,
- 0, index, bi)
- {
- fprintf (cgraph_dump_file, "%s ",
- cgraph_get_static_name_by_uid (index));
- }
- fprintf (cgraph_dump_file, "\n locals written: ");
- EXECUTE_IF_SET_IN_BITMAP (l->statics_written_by_decl_uid,
- 0, index, bi)
- {
- fprintf(cgraph_dump_file, "%s ",
- cgraph_get_static_name_by_uid (index));
- }
- }
- }
-
- /* Propagate the local information thru the call graph to produce
- the global information. All the nodes within a cycle will have
- the same info so we collapse cycles first. Then we can do the
- propagation in one pass from the leaves to the roots. */
- order_pos = cgraph_reduced_inorder (order, true);
- for (i = order_pos - 1; i >= 0; i--)
- {
- static_vars_info_t node_info;
- global_static_vars_info_t node_g =
- ggc_calloc (1, sizeof (struct global_static_vars_info_d));
- local_static_vars_info_t node_l;
-
-
- bool read_all;
- bool write_all;
-
- node = order[i];
- node_info = node->static_vars_info;
- node_info->global = node_g;
- node_l = node_info->local;
-
- read_all = node->local.calls_read_all;
- write_all = node->local.calls_write_all;
-
- /* If any node in a cycle is calls_read_all or calls_write_all
- they all are. */
- w = node->next_cycle;
- while (w)
- {
- read_all |= w->local.calls_read_all;
- write_all |= w->local.calls_write_all;
- w = w->next_cycle;
- }
-
- /* Initialized the bitmaps for the reduced nodes */
- if (read_all)
- node_g->statics_read_by_decl_uid = all_module_statics;
- else
- {
- node_g->statics_read_by_decl_uid = BITMAP_GGC_ALLOC ();
- bitmap_copy (node_g->statics_read_by_decl_uid,
- node_l->statics_read_by_decl_uid);
- }
-
- if (write_all)
- node_g->statics_written_by_decl_uid = all_module_statics;
- else
- {
- node_g->statics_written_by_decl_uid = BITMAP_GGC_ALLOC ();
- bitmap_copy (node_g->statics_written_by_decl_uid,
- node_l->statics_written_by_decl_uid);
- }
-
- w = node->next_cycle;
- while (w)
- {
- /* All nodes within a cycle share the same global info bitmaps. */
- static_vars_info_t w_info = w->static_vars_info;
- local_static_vars_info_t w_l;
-
- w_info->global = node_g;
- w_l = w_info->local;
-
- /* These global bitmaps are initialized from the local info
- of all of the nodes in the region. However there is no
- need to do any work if the bitmaps were set to
- all_module_statics. */
- if (!read_all)
- bitmap_a_or_b (node_g->statics_read_by_decl_uid,
- node_g->statics_read_by_decl_uid,
- w_l->statics_read_by_decl_uid);
- if (!write_all)
- bitmap_a_or_b (node_g->statics_written_by_decl_uid,
- node_g->statics_written_by_decl_uid,
- w_l->statics_written_by_decl_uid);
- w = w->next_cycle;
- }
-
- cgraph_propagate_bits (node);
-
- w = node->next_cycle;
- while (w)
- {
- cgraph_propagate_bits (w);
- w = w->next_cycle;
- }
- }
-
- if (cgraph_dump_file)
- {
- for (i = order_pos - 1; i >= 0; i--)
- {
- static_vars_info_t node_info;
- global_static_vars_info_t node_g;
- int index;
- bitmap_iterator bi;
-
- node = order[i];
- node_info = node->static_vars_info;
- node_g = node_info->global;
- fprintf (cgraph_dump_file,
- "\nFunction name:%s/%i:",
- cgraph_node_name (node), node->uid);
- w = node->next_cycle;
- while (w)
- {
- fprintf (cgraph_dump_file, "\n next cycle: %s/%i ",
- cgraph_node_name (w), w->uid);
- w = w->next_cycle;
- }
- fprintf (cgraph_dump_file, "\n globals read: ");
- EXECUTE_IF_SET_IN_BITMAP (node_g->statics_read_by_decl_uid,
- 0, index, bi)
- {
- fprintf (cgraph_dump_file, "%s ",
- cgraph_get_static_name_by_uid (index));
- }
- fprintf (cgraph_dump_file, "\n globals written: ");
- EXECUTE_IF_SET_IN_BITMAP (node_g->statics_written_by_decl_uid,
- 0, index, bi)
- {
- fprintf (cgraph_dump_file, "%s ",
- cgraph_get_static_name_by_uid (index));
- }
- }
- }
-
- /* Cleanup. */
- for (i = order_pos - 1; i >= 0; i--)
- {
- static_vars_info_t node_info;
- global_static_vars_info_t node_g;
- node = order[i];
- node_info = node->static_vars_info;
- node_g = node_info->global;
-
- node_g->var_anns_valid = false;
-
- /* Create the complimentary sets. These are more useful for
- certain apis. */
- node_g->statics_not_read_by_decl_uid = BITMAP_GGC_ALLOC ();
- node_g->statics_not_written_by_decl_uid = BITMAP_GGC_ALLOC ();
-
- /* FIXME -- PROFILE-RESTRUCTURE: Delete next 4 assignments. */
- node_g->statics_read_by_ann_uid = BITMAP_GGC_ALLOC ();
- node_g->statics_written_by_ann_uid = BITMAP_GGC_ALLOC ();
- node_g->statics_not_read_by_ann_uid = BITMAP_GGC_ALLOC ();
- node_g->statics_not_written_by_ann_uid = BITMAP_GGC_ALLOC ();
-
- if (node_g->statics_read_by_decl_uid != all_module_statics)
- {
- bitmap_operation (node_g->statics_not_read_by_decl_uid,
- all_module_statics,
- node_g->statics_read_by_decl_uid,
- BITMAP_AND_COMPL);
- }
-
- if (node_g->statics_written_by_decl_uid != all_module_statics)
- bitmap_operation (node_g->statics_not_written_by_decl_uid,
- all_module_statics,
- node_g->statics_written_by_decl_uid,
- BITMAP_AND_COMPL);
-
- w = node->next_cycle;
-
- while (w)
- {
- struct cgraph_node * last = w;
- w = w->next_cycle;
- last->next_cycle = NULL;
- }
- }
-
- free (order);
-}
-
-/* Expand all functions that must be output.
-
- Attempt to topologically sort the nodes so function is output when
- all called functions are already assembled to allow data to be
- propagated across the callgraph. Use a stack to get smaller distance
- between a function and its callees (later we may choose to use a more
- sophisticated algorithm for function reordering; we will likely want
- to use subsections to make the output functions appear in top-down
- order). */
-
-static void
-cgraph_expand_all_functions (void)
-{
- struct cgraph_node *node;
- struct cgraph_node **order =
- xcalloc (cgraph_n_nodes, sizeof (struct cgraph_node *));
- int order_pos = 0, new_order_pos = 0;
- int i;
-
- order_pos = cgraph_postorder (order);
- gcc_assert (order_pos == cgraph_n_nodes);
-
- /* Garbage collector may remove inline clones we eliminate during
- optimization. So we must be sure to not reference them. */
- for (i = 0; i < order_pos; i++)
- if (order[i]->output)
- order[new_order_pos++] = order[i];
-
- for (i = new_order_pos - 1; i >= 0; i--)
- {
- node = order[i];
- if (node->output)
- {
- gcc_assert (node->reachable);
- node->output = 0;
- cgraph_expand_function (node);
- }
+ if (vnode->needed
+ && (DECL_COMDAT (vnode->decl) || TREE_PUBLIC (vnode->decl)))
+ vnode->externally_visible = 1;
+ gcc_assert (TREE_STATIC (vnode->decl));
}
- free (order);
-}
-
-/* Mark all local and external functions.
-
- A local function is one whose calls can occur only in the current
- compilation unit and all its calls are explicit, so we can change
- its calling convention. We simply mark all static functions whose
- address is not taken as local.
-
- An external function is one whose body is outside the current
- compilation unit. */
-
-static void
-cgraph_mark_local_and_external_functions (void)
-{
- struct cgraph_node *node;
- /* Figure out functions we want to assemble. */
- for (node = cgraph_nodes; node; node = node->next)
- {
- node->local.local = (!node->needed
- && DECL_SAVED_TREE (node->decl)
- && !TREE_PUBLIC (node->decl));
- node->local.external = (!DECL_SAVED_TREE (node->decl)
- && TREE_PUBLIC (node->decl));
- }
+ /* Because we have to be conservative on the boundaries of source
+ level units, it is possible that we marked some functions in
+ reachable just because they might be used later via external
+ linkage, but after making them local they are really unreachable
+ now. */
+ cgraph_remove_unreachable_nodes (true, cgraph_dump_file);
if (cgraph_dump_file)
{
if (node->local.local)
fprintf (cgraph_dump_file, " %s", cgraph_node_name (node));
fprintf (cgraph_dump_file, "\n\n");
-
- fprintf (cgraph_dump_file, "\nMarking external functions:");
+ fprintf (cgraph_dump_file, "\nMarking externally visible functions:");
for (node = cgraph_nodes; node; node = node->next)
- if (node->local.external)
+ if (node->local.externally_visible)
fprintf (cgraph_dump_file, " %s", cgraph_node_name (node));
- fprintf (cgraph_dump_file, "\n\n");
-}
+ fprintf (cgraph_dump_file, "\n\n");
+ }
+ cgraph_function_flags_ready = true;
}
/* Return true when function body of DECL still needs to be kept around
verify_cgraph ();
#endif
if (!flag_unit_at_a_time)
- return;
+ {
+ cgraph_varpool_assemble_pending_decls ();
+ return;
+ }
+
+ process_pending_assemble_externals ();
+
+ /* Frontend may output common variables after the unit has been finalized.
+ It is safe to deal with them here as they are always zero initialized. */
+ cgraph_varpool_analyze_pending_decls ();
+
timevar_push (TV_CGRAPHOPT);
if (!quiet_flag)
fprintf (stderr, "Performing intraprocedural optimizations\n");
- cgraph_mark_local_and_external_functions ();
+ cgraph_function_and_variable_visibility ();
if (cgraph_dump_file)
{
fprintf (cgraph_dump_file, "Marked ");
dump_cgraph (cgraph_dump_file);
}
-
- if (flag_inline_trees)
- cgraph_decide_inlining ();
+ ipa_passes ();
+ /* This pass remove bodies of extern inline functions we never inlined.
+ Do this later so other IPA passes see what is really going on. */
+ cgraph_remove_unreachable_nodes (false, dump_file);
cgraph_global_info_ready = true;
if (cgraph_dump_file)
{
fprintf (cgraph_dump_file, "Optimized ");
dump_cgraph (cgraph_dump_file);
+ dump_varpool (cgraph_dump_file);
}
timevar_pop (TV_CGRAPHOPT);
verify_cgraph ();
#endif
- /* This call was moved here from cgraph_expand_all_functions so that
- cgraph_characterize_statics could use the output flag of the cgraph
- node. */
-
cgraph_mark_functions_to_output ();
-
- cgraph_characterize_statics ();
-
cgraph_expand_all_functions ();
+ cgraph_varpool_remove_unreferenced_decls ();
+
+ cgraph_varpool_assemble_pending_decls ();
+
if (cgraph_dump_file)
{
fprintf (cgraph_dump_file, "\nFinal ");
/* ??? We will get called LATE in the compilation process. */
if (cgraph_global_info_ready)
- tree_rest_of_compilation (decl);
+ {
+ tree_lowering_passes (decl);
+ tree_rest_of_compilation (decl);
+ }
else
cgraph_finalize_function (decl, 0);
init_cgraph (void)
{
cgraph_dump_file = dump_begin (TDI_cgraph, NULL);
- memory_identifier = get_identifier("memory");
}
-#include "gt-cgraphunit.h"
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