/* Callgraph based analysis of static variables.
- Copyright (C) 2004, 2005, 2007, 2008 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2005, 2007, 2008, 2009, 2010
+ Free Software Foundation, Inc.
Contributed by Kenneth Zadeck <zadeck@naturalbridge.com>
This file is part of GCC.
<http://www.gnu.org/licenses/>. */
/* This file gathers information about how variables whose scope is
- confined to the compilation unit are used.
+ confined to the compilation unit are used.
There are two categories of information produced by this pass:
local and global sets are examined to make the call clobbering less
traumatic, promote some statics to registers, and improve aliasing
information.
-
+
Currently must be run after inlining decisions have been made since
otherwise, the local sets will not contain information that is
consistent with post inlined state. The global sets are not prone
#include "tree-pass.h"
#include "langhooks.h"
#include "pointer-set.h"
+#include "splay-tree.h"
#include "ggc.h"
#include "ipa-utils.h"
#include "ipa-reference.h"
-#include "c-common.h"
#include "gimple.h"
#include "cgraph.h"
#include "output.h"
#include "timevar.h"
#include "diagnostic.h"
#include "langhooks.h"
+#include "lto-streamer.h"
+
+static void remove_node_data (struct cgraph_node *node,
+ void *data ATTRIBUTE_UNUSED);
+static void duplicate_node_data (struct cgraph_node *src,
+ struct cgraph_node *dst,
+ void *data ATTRIBUTE_UNUSED);
/* The static variables defined within the compilation unit that are
- loaded or stored directly by function that owns this structure. */
+ loaded or stored directly by function that owns this structure. */
-struct ipa_reference_local_vars_info_d
+struct ipa_reference_local_vars_info_d
{
bitmap statics_read;
bitmap statics_written;
strongly connected component will have the same information. This
sharing saves both time and space in the computation of the vectors
as well as their translation from decl_uid form to ann_uid
- form. */
+ form. */
struct ipa_reference_global_vars_info_d
{
typedef struct ipa_reference_local_vars_info_d *ipa_reference_local_vars_info_t;
typedef struct ipa_reference_global_vars_info_d *ipa_reference_global_vars_info_t;
-struct ipa_reference_vars_info_d
+struct ipa_reference_vars_info_d
{
ipa_reference_local_vars_info_t local;
ipa_reference_global_vars_info_t global;
memory. */
static bitmap all_module_statics;
-static struct pointer_set_t *visited_nodes;
-
/* Obstack holding bitmaps of local analysis (live from analysis to
propagation) */
static bitmap_obstack local_info_obstack;
static bitmap_obstack global_info_obstack;
/* Holders of ipa cgraph hooks: */
-static struct cgraph_node_hook_list *function_insertion_hook_holder;
static struct cgraph_2node_hook_list *node_duplication_hook_holder;
static struct cgraph_node_hook_list *node_removal_hook_holder;
VEC_replace (ipa_reference_vars_info_t, ipa_reference_vars_vector, node->uid, info);
}
-/* Get a bitmap that contains all of the locally referenced static
- variables for function FN. */
-static ipa_reference_local_vars_info_t
-get_local_reference_vars_info (struct cgraph_node *fn)
-{
- ipa_reference_vars_info_t info = get_reference_vars_info (fn);
-
- if (info)
- return info->local;
- else
- /* This phase was not run. */
- return NULL;
-}
-
/* Get a bitmap that contains all of the globally referenced static
variables for function FN. */
-
+
static ipa_reference_global_vars_info_t
-get_global_reference_vars_info (struct cgraph_node *fn)
+get_global_reference_vars_info (struct cgraph_node *fn)
{
ipa_reference_vars_info_t info = get_reference_vars_info (fn);
if (info)
return info->global;
else
- /* This phase was not run. */
+ /* This phase was not run. */
return NULL;
}
that are read during the execution of the function FN. Returns
NULL if no data is available. */
-bitmap
-ipa_reference_get_read_global (struct cgraph_node *fn)
+bitmap
+ipa_reference_get_read_global (struct cgraph_node *fn)
{
ipa_reference_global_vars_info_t g = get_global_reference_vars_info (fn);
- if (g)
+ if (g)
return g->statics_read;
else
return NULL;
that variables written may or may not be read during the function
call. Returns NULL if no data is available. */
-bitmap
-ipa_reference_get_written_global (struct cgraph_node *fn)
+bitmap
+ipa_reference_get_written_global (struct cgraph_node *fn)
{
ipa_reference_global_vars_info_t g = get_global_reference_vars_info (fn);
- if (g)
+ if (g)
return g->statics_written;
else
return NULL;
that are not read during the execution of the function FN. Returns
NULL if no data is available. */
-bitmap
-ipa_reference_get_not_read_global (struct cgraph_node *fn)
+bitmap
+ipa_reference_get_not_read_global (struct cgraph_node *fn)
{
ipa_reference_global_vars_info_t g = get_global_reference_vars_info (fn);
- if (g)
+ if (g)
return g->statics_not_read;
else
return NULL;
that variables written may or may not be read during the function
call. Returns NULL if no data is available. */
-bitmap
-ipa_reference_get_not_written_global (struct cgraph_node *fn)
+bitmap
+ipa_reference_get_not_written_global (struct cgraph_node *fn)
{
ipa_reference_global_vars_info_t g = get_global_reference_vars_info (fn);
- if (g)
+ if (g)
return g->statics_not_written;
else
return NULL;
/* Add VAR to all_module_statics and the two
reference_vars_to_consider* sets. */
-static inline void
-add_static_var (tree var)
+static inline void
+add_static_var (tree var)
{
int uid = DECL_UID (var);
gcc_assert (TREE_CODE (var) == VAR_DECL);
/* 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)
+static inline bool
+is_proper_for_analysis (tree t)
{
/* If the variable has the "used" attribute, treat it as if it had a
been touched by the devil. */
- if (lookup_attribute ("used", DECL_ATTRIBUTES (t)))
+ if (DECL_PRESERVE_P (t))
return false;
/* Do not want to do anything with volatile except mark any
function that uses one to be not const or pure. */
- if (TREE_THIS_VOLATILE (t))
- return false;
-
- /* Do not care about a local automatic that is not static. */
- if (!TREE_STATIC (t) && !DECL_EXTERNAL (t))
- return false;
-
- if (DECL_EXTERNAL (t) || TREE_PUBLIC (t))
+ if (TREE_THIS_VOLATILE (t))
return false;
/* We cannot touch decls where the type needs constructing. */
return true;
}
-/* Mark tree T as having address taken. */
-
-static void
-mark_address_taken (tree x)
-{
- if (TREE_CODE (x) == VAR_DECL
- && module_statics_escape && has_proper_scope_for_analysis (x))
- bitmap_set_bit (module_statics_escape, DECL_UID (x));
-}
-
-/* Wrapper around mark_address_taken for the stmt walker. */
-
-static bool
-mark_address (gimple stmt ATTRIBUTE_UNUSED, tree addr,
- void *data ATTRIBUTE_UNUSED)
-{
- while (handled_component_p (addr))
- addr = TREE_OPERAND (addr, 0);
- mark_address_taken (addr);
- return false;
-}
-
-/* Mark load of T. */
-
-static bool
-mark_load (gimple stmt ATTRIBUTE_UNUSED, tree t, void *data)
-{
- ipa_reference_local_vars_info_t local = (ipa_reference_local_vars_info_t)data;
- if (TREE_CODE (t) == VAR_DECL
- && has_proper_scope_for_analysis (t))
- bitmap_set_bit (local->statics_read, DECL_UID (t));
- return false;
-}
-
-/* Mark store of T. */
-
-static bool
-mark_store (gimple stmt ATTRIBUTE_UNUSED, tree t, void *data)
-{
- ipa_reference_local_vars_info_t local = (ipa_reference_local_vars_info_t)data;
- if (TREE_CODE (t) == VAR_DECL
- && has_proper_scope_for_analysis (t))
- {
- if (local)
- bitmap_set_bit (local->statics_written, DECL_UID (t));
- /* Mark the write so we can tell which statics are
- readonly. */
- if (module_statics_written)
- bitmap_set_bit (module_statics_written, DECL_UID (t));
- }
- return false;
-}
-
-/* Look for memory clobber and set read_all/write_all if present. */
-
-static void
-check_asm_memory_clobber (ipa_reference_local_vars_info_t local, gimple stmt)
-{
- size_t i;
- tree op;
-
- for (i = 0; i < gimple_asm_nclobbers (stmt); i++)
- {
- op = gimple_asm_clobber_op (stmt, i);
- if (simple_cst_equal(TREE_VALUE (op), memory_identifier_string) == 1)
- {
- /* Abandon all hope, ye who enter here. */
- local->calls_read_all = true;
- local->calls_write_all = true;
- }
- }
-}
-
-/* Look for external calls and set read_all/write_all correspondingly. */
-
-static void
-check_call (ipa_reference_local_vars_info_t local, gimple stmt)
-{
- int flags = gimple_call_flags (stmt);
- tree callee_t = gimple_call_fndecl (stmt);
- enum availability avail = AVAIL_NOT_AVAILABLE;
-
- if (callee_t)
- {
- struct cgraph_node* callee = cgraph_node(callee_t);
- avail = cgraph_function_body_availability (callee);
- }
-
- if (avail <= AVAIL_OVERWRITABLE)
- if (local)
- {
- if (flags & ECF_CONST)
- ;
- else if (flags & ECF_PURE)
- local->calls_read_all = true;
- else
- {
- local->calls_read_all = true;
- local->calls_write_all = true;
- }
- }
- /* TODO: To be able to produce sane results, we should also handle
- common builtins, in particular throw.
- Indirect calls hsould be only counted and as inliner is replacing them
- by direct calls, we can conclude if any indirect calls are left in body */
-}
-
-/* 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_stmt_for_static_refs (gimple_stmt_iterator *gsip,
- struct cgraph_node *fn)
-{
- gimple stmt = gsi_stmt (*gsip);
- ipa_reference_local_vars_info_t local = NULL;
-
- if (fn)
- local = get_reference_vars_info (fn)->local;
-
- /* Look for direct loads and stores. */
- walk_stmt_load_store_addr_ops (stmt, local, mark_load, mark_store,
- mark_address);
-
- if (is_gimple_call (stmt))
- check_call (local, stmt);
- else if (gimple_code (stmt) == GIMPLE_ASM)
- check_asm_memory_clobber (local, stmt);
-
- return NULL;
-}
-
-/* Call-back to scan variable initializers for static references.
- Called using walk_tree. */
-
-static tree
-scan_initializer_for_static_refs (tree *tp, int *walk_subtrees,
- void *data ATTRIBUTE_UNUSED)
-{
- tree t = *tp;
-
- if (TREE_CODE (t) == ADDR_EXPR)
- {
- mark_address_taken (get_base_var (t));
- *walk_subtrees = 0;
- }
- /* Save some cycles by not walking types and declaration as we
- won't find anything useful there anyway. */
- else if (IS_TYPE_OR_DECL_P (*tp))
- *walk_subtrees = 0;
-
- return NULL;
-}
-
/* Lookup the tree node for the static variable that has UID. */
static tree
get_static_decl (int index)
{
- splay_tree_node stn =
+ splay_tree_node stn =
splay_tree_lookup (reference_vars_to_consider, index);
if (stn)
return (tree)stn->value;
static const char *
get_static_name (int index)
{
- splay_tree_node stn =
+ splay_tree_node stn =
splay_tree_lookup (reference_vars_to_consider, index);
if (stn)
return lang_hooks.decl_printable_name ((tree)(stn->value), 2);
propagate_bits (ipa_reference_global_vars_info_t x_global, struct cgraph_node *x)
{
struct cgraph_edge *e;
- for (e = x->callees; e; e = e->next_callee)
+ for (e = x->callees; e; e = e->next_callee)
{
struct cgraph_node *y = e->callee;
- /* Only look at the master nodes and skip external nodes. */
+ /* Only look into nodes we can propagate something. */
if (cgraph_function_body_availability (e->callee) > AVAIL_OVERWRITABLE)
{
if (get_reference_vars_info (y))
{
- ipa_reference_vars_info_t y_info
+ ipa_reference_vars_info_t y_info
= get_reference_vars_info (y);
ipa_reference_global_vars_info_t y_global = y_info->global;
/* Calls in current cycle do not have global computed yet. */
if (!y_info->global)
continue;
-
+
if (x_global->statics_read
!= all_module_statics)
{
- if (y_global->statics_read
+ if (y_global->statics_read
== all_module_statics)
{
BITMAP_FREE (x_global->statics_read);
- x_global->statics_read
+ x_global->statics_read
= 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
+ else if (x_global->statics_read
!= y_global->statics_read)
bitmap_ior_into (x_global->statics_read,
y_global->statics_read);
}
-
- if (x_global->statics_written
+
+ if (x_global->statics_written
!= all_module_statics)
{
- if (y_global->statics_written
+ if (y_global->statics_written
== all_module_statics)
{
BITMAP_FREE (x_global->statics_written);
- x_global->statics_written
+ x_global->statics_written
= 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
+ else if (x_global->statics_written
!= y_global->statics_written)
bitmap_ior_into (x_global->statics_written,
y_global->statics_written);
}
}
- else
+ else
gcc_unreachable ();
}
}
/* The init routine for analyzing global static variable usage. See
comments at top for description. */
-static void
-ipa_init (void)
+static void
+ipa_init (void)
{
+ static bool init_p = false;
+
+ if (init_p)
+ return;
+
+ init_p = true;
+
memory_identifier_string = build_string(7, "memory");
reference_vars_to_consider =
module_statics_written = BITMAP_ALLOC (&local_info_obstack);
all_module_statics = BITMAP_ALLOC (&global_info_obstack);
- /* There are some shared nodes, in particular the initializers on
- static declarations. We do not need to scan them more than once
- since all we would be interested in are the addressof
- operations. */
- visited_nodes = pointer_set_create ();
+ node_removal_hook_holder =
+ cgraph_add_node_removal_hook (&remove_node_data, NULL);
+ node_duplication_hook_holder =
+ cgraph_add_node_duplication_hook (&duplicate_node_data, NULL);
}
/* Check out the rhs of a static or global initialization VNODE to see
compilation unit but their right hand sides may contain references
to variables defined within this unit. */
-static void
+static void
analyze_variable (struct varpool_node *vnode)
{
- struct walk_stmt_info wi;
- tree global = vnode->decl;
-
- memset (&wi, 0, sizeof (wi));
- wi.pset = visited_nodes;
- walk_tree (&DECL_INITIAL (global), scan_initializer_for_static_refs,
- &wi, wi.pset);
+ int i;
+ struct ipa_ref *ref;
+ for (i = 0; ipa_ref_list_reference_iterate (&vnode->ref_list, i, ref); i++)
+ {
+ tree var;
+ if (ref->refered_type != IPA_REF_VARPOOL)
+ continue;
+ var = ipa_ref_varpool_node (ref)->decl;
+ if (ipa_ref_varpool_node (ref)->externally_visible
+ || !ipa_ref_varpool_node (ref)->analyzed
+ || !is_proper_for_analysis (var))
+ continue;
+ switch (ref->use)
+ {
+ case IPA_REF_LOAD:
+ case IPA_REF_STORE:
+ gcc_unreachable ();
+ break;
+ case IPA_REF_ADDR:
+ bitmap_set_bit (module_statics_escape, DECL_UID (var));
+ break;
+ }
+ }
}
+
/* Set up the persistent info for FN. */
static ipa_reference_local_vars_info_t
init_function_info (struct cgraph_node *fn)
{
- ipa_reference_vars_info_t info
+ ipa_reference_vars_info_t info
= XCNEW (struct ipa_reference_vars_info_d);
ipa_reference_local_vars_info_t l
= XCNEW (struct ipa_reference_local_vars_info_d);
return l;
}
+
/* This is the main routine for finding the reference patterns for
global variables within a function FN. */
-
+
static void
analyze_function (struct cgraph_node *fn)
{
- tree decl = fn->decl;
- struct function *this_cfun = DECL_STRUCT_FUNCTION (decl);
- basic_block this_block;
-#ifdef ENABLE_CHECKING
- tree step;
-#endif
-
- if (dump_file)
- fprintf (dump_file, "\n local analysis of %s\n", cgraph_node_name (fn));
-
- push_cfun (DECL_STRUCT_FUNCTION (decl));
- current_function_decl = decl;
-
- init_function_info (fn);
- FOR_EACH_BB_FN (this_block, this_cfun)
+ ipa_reference_local_vars_info_t local;
+ struct ipa_ref *ref;
+ int i;
+ tree var;
+ struct cgraph_edge *ie;
+
+ local = init_function_info (fn);
+ /* Process indirect calls. All direct calles are handled at propagation
+ time. */
+ for (ie = fn->indirect_calls; ie; ie = ie->next_callee)
+ if (!(ie->indirect_info->ecf_flags & ECF_CONST))
+ {
+ local->calls_read_all = true;
+ if (!(ie->indirect_info->ecf_flags & ECF_PURE)
+ && ((ie->indirect_info->ecf_flags & (ECF_NOTHROW | ECF_NORETURN))
+ != (ECF_NOTHROW | ECF_NORETURN)))
+ local->calls_write_all = true;
+ }
+ for (i = 0; ipa_ref_list_reference_iterate (&fn->ref_list, i, ref); i++)
{
- gimple_stmt_iterator gsi;
- gimple phi;
- tree op;
- use_operand_p use;
- ssa_op_iter iter;
-
- /* Find the addresses taken in phi node arguments. */
- for (gsi = gsi_start_phis (this_block);
- !gsi_end_p (gsi);
- gsi_next (&gsi))
+ if (ref->refered_type != IPA_REF_VARPOOL)
+ continue;
+ var = ipa_ref_varpool_node (ref)->decl;
+ if (ipa_ref_varpool_node (ref)->externally_visible
+ || !ipa_ref_varpool_node (ref)->analyzed
+ || !is_proper_for_analysis (var))
+ continue;
+ switch (ref->use)
{
- phi = gsi_stmt (gsi);
- FOR_EACH_PHI_ARG (use, phi, iter, SSA_OP_USE)
- {
- op = USE_FROM_PTR (use);
- if (TREE_CODE (op) == ADDR_EXPR)
- mark_address_taken (get_base_var (op));
- }
+ case IPA_REF_LOAD:
+ bitmap_set_bit (local->statics_read, DECL_UID (var));
+ break;
+ case IPA_REF_STORE:
+ bitmap_set_bit (local->statics_written, DECL_UID (var));
+ bitmap_set_bit (module_statics_written, DECL_UID (var));
+ break;
+ case IPA_REF_ADDR:
+ bitmap_set_bit (module_statics_escape, DECL_UID (var));
+ break;
}
-
- for (gsi = gsi_start_bb (this_block); !gsi_end_p (gsi); gsi_next (&gsi))
- scan_stmt_for_static_refs (&gsi, fn);
}
-#ifdef ENABLE_CHECKING
- /* Verify that all local initializers was expanded by gimplifier. */
- for (step = DECL_STRUCT_FUNCTION (decl)->local_decls;
- step;
- step = TREE_CHAIN (step))
+ if ((flags_from_decl_or_type (fn->decl) & (ECF_NOTHROW | ECF_NORETURN))
+ == (ECF_NOTHROW | ECF_NORETURN))
{
- tree var = TREE_VALUE (step);
- if (TREE_CODE (var) == VAR_DECL
- && DECL_INITIAL (var)
- && !TREE_STATIC (var))
- gcc_unreachable ();
+ local->calls_write_all = false;
+ bitmap_clear (local->statics_written);
}
-#endif
- pop_cfun ();
- current_function_decl = NULL;
+
+ /* Free bitmaps of direct references if we can not use them anyway. */
+ if (local->calls_write_all)
+ BITMAP_FREE (local->statics_written);
+ if (local->calls_read_all)
+ BITMAP_FREE (local->statics_read);
}
/* Remove local data associated with function FN. */
{
ipa_reference_vars_info_t info = get_reference_vars_info (fn);
ipa_reference_global_vars_info_t g = info->global;
-
+
clean_function_local_data (fn);
if (g)
{
if (g->statics_read
&& g->statics_read != all_module_statics)
BITMAP_FREE (g->statics_read);
-
+
if (g->statics_written
&& g->statics_written != all_module_statics)
BITMAP_FREE (g->statics_written);
-
+
if (g->statics_not_read
&& g->statics_not_read != all_module_statics)
BITMAP_FREE (g->statics_not_read);
-
+
if (g->statics_not_written
&& g->statics_not_written != all_module_statics)
BITMAP_FREE (g->statics_not_written);
free (g);
info->global = NULL;
}
-
+
free (get_reference_vars_info (fn));
set_reference_vars_info (fn, NULL);
}
-/* Called when new function is inserted to callgraph late. */
-static void
-add_new_function (struct cgraph_node *node, void *data ATTRIBUTE_UNUSED)
-{
- /* There are some shared nodes, in particular the initializers on
- static declarations. We do not need to scan them more than once
- since all we would be interested in are the addressof
- operations. */
- analyze_function (node);
- visited_nodes = NULL;
-}
-
-static bitmap
-copy_local_bitmap (bitmap src)
-{
- bitmap dst;
- if (!src)
- return NULL;
- if (src == all_module_statics)
- return all_module_statics;
- dst = BITMAP_ALLOC (&local_info_obstack);
- bitmap_copy (dst, src);
- return dst;
-}
-
static bitmap
copy_global_bitmap (bitmap src)
{
return dst;
}
+
/* Called when new clone is inserted to callgraph late. */
static void
void *data ATTRIBUTE_UNUSED)
{
ipa_reference_global_vars_info_t ginfo;
- ipa_reference_local_vars_info_t linfo;
ipa_reference_global_vars_info_t dst_ginfo;
- ipa_reference_local_vars_info_t dst_linfo;
ginfo = get_global_reference_vars_info (src);
- linfo = get_local_reference_vars_info (src);
- if (!linfo && !ginfo)
+ if (!ginfo)
return;
init_function_info (dst);
- if (linfo)
- {
- dst_linfo = get_local_reference_vars_info (dst);
- dst_linfo->statics_read = copy_local_bitmap (linfo->statics_read);
- dst_linfo->statics_written = copy_local_bitmap (linfo->statics_written);
- dst_linfo->calls_read_all = linfo->calls_read_all;
- dst_linfo->calls_write_all = linfo->calls_write_all;
- }
if (ginfo)
{
get_reference_vars_info (dst)->global = XCNEW (struct ipa_reference_global_vars_info_d);
/* Analyze each function in the cgraph to see which global or statics
are read or written. */
-static void
+static void
generate_summary (void)
{
struct cgraph_node *node;
bitmap_iterator bi;
bitmap module_statics_readonly;
bitmap bm_temp;
-
- function_insertion_hook_holder =
- cgraph_add_function_insertion_hook (&add_new_function, NULL);
- node_removal_hook_holder =
- cgraph_add_node_removal_hook (&remove_node_data, NULL);
- node_duplication_hook_holder =
- cgraph_add_node_duplication_hook (&duplicate_node_data, NULL);
+
ipa_init ();
module_statics_readonly = BITMAP_ALLOC (&local_info_obstack);
bm_temp = BITMAP_ALLOC (&local_info_obstack);
FOR_EACH_STATIC_INITIALIZER (vnode)
analyze_variable (vnode);
- /* Process all of the functions next.
-
- We do not want to process any of the clones so we check that this
- is a master clone. However, we do need to process any
- AVAIL_OVERWRITABLE functions (these are never clones) because
- they may cause a static variable to escape. The code that can
- overwrite such a function cannot access the statics because it
- would not be in the same compilation unit. When the analysis is
- finished, the computed information of these AVAIL_OVERWRITABLE is
- replaced with worst case info.
- */
+ /* Process all of the functions next. */
for (node = cgraph_nodes; node; node = node->next)
- if (cgraph_function_body_availability (node) >= AVAIL_OVERWRITABLE)
+ if (node->analyzed)
analyze_function (node);
- pointer_set_destroy (visited_nodes);
- visited_nodes = NULL;
-
/* Prune out the variables that were found to behave badly
(i.e. have their address taken). */
EXECUTE_IF_SET_IN_BITMAP (module_statics_escape, 0, index, bi)
{
splay_tree_remove (reference_vars_to_consider, index);
}
-
- bitmap_and_compl_into (all_module_statics,
+
+ bitmap_and_compl_into (all_module_statics,
module_statics_escape);
-
+
bitmap_and_compl (module_statics_readonly, all_module_statics,
module_statics_written);
-
+
/* If the address is not taken, we can unset the addressable bit
on this variable. */
EXECUTE_IF_SET_IN_BITMAP (all_module_statics, 0, index, bi)
{
tree var = get_static_decl (index);
TREE_ADDRESSABLE (var) = 0;
- if (dump_file)
+ if (dump_file)
fprintf (dump_file, "Not TREE_ADDRESSABLE var %s\n",
get_static_name (index));
}
-
+
/* If the variable is never written, we can set the TREE_READONLY
flag. Additionally if it has a DECL_INITIAL that is made up of
constants we can treat the entire global as a constant. */
-
+
bitmap_and_compl (module_statics_readonly, all_module_statics,
module_statics_written);
EXECUTE_IF_SET_IN_BITMAP (module_statics_readonly, 0, index, bi)
{
tree var = get_static_decl (index);
-
+
/* Ignore variables in named sections - changing TREE_READONLY
changes the section flags, potentially causing conflicts with
other variables in the same named section. */
{
TREE_READONLY (var) = 1;
if (dump_file)
- fprintf (dump_file, "read-only var %s\n",
+ fprintf (dump_file, "read-only var %s\n",
get_static_name (index));
}
}
-
+
BITMAP_FREE(module_statics_escape);
BITMAP_FREE(module_statics_written);
module_statics_escape = NULL;
module_statics_written = NULL;
-
+
if (dump_file)
EXECUTE_IF_SET_IN_BITMAP (all_module_statics, 0, index, bi)
{
fprintf (dump_file, "\nPromotable global:%s",
get_static_name (index));
}
-
+
for (node = cgraph_nodes; node; node = node->next)
if (cgraph_function_body_availability (node) >= AVAIL_OVERWRITABLE)
{
ipa_reference_local_vars_info_t l;
l = get_reference_vars_info (node)->local;
-
+
/* Any variables that are not in all_module_statics are
removed from the local maps. This will include all of the
variables that were found to escape in the function
scanning. */
- bitmap_and_into (l->statics_read,
- all_module_statics);
- bitmap_and_into (l->statics_written,
- all_module_statics);
+ if (l->statics_read)
+ bitmap_and_into (l->statics_read,
+ all_module_statics);
+ if (l->statics_written)
+ bitmap_and_into (l->statics_written,
+ all_module_statics);
}
-
+
BITMAP_FREE(module_statics_readonly);
BITMAP_FREE(bm_temp);
-
+
if (dump_file)
for (node = cgraph_nodes; node; node = node->next)
if (cgraph_function_body_availability (node) >= AVAIL_OVERWRITABLE)
ipa_reference_local_vars_info_t l;
unsigned int index;
bitmap_iterator bi;
-
+
l = get_reference_vars_info (node)->local;
- fprintf (dump_file,
- "\nFunction name:%s/%i:",
+ fprintf (dump_file,
+ "\nFunction name:%s/%i:",
cgraph_node_name (node), node->uid);
fprintf (dump_file, "\n locals read: ");
- EXECUTE_IF_SET_IN_BITMAP (l->statics_read,
- 0, index, bi)
- {
- fprintf (dump_file, "%s ",
- get_static_name (index));
- }
+ if (l->statics_read)
+ EXECUTE_IF_SET_IN_BITMAP (l->statics_read,
+ 0, index, bi)
+ {
+ fprintf (dump_file, "%s ",
+ get_static_name (index));
+ }
fprintf (dump_file, "\n locals written: ");
- EXECUTE_IF_SET_IN_BITMAP (l->statics_written,
- 0, index, bi)
- {
- fprintf(dump_file, "%s ",
- get_static_name (index));
- }
+ if (l->statics_written)
+ EXECUTE_IF_SET_IN_BITMAP (l->statics_written,
+ 0, index, bi)
+ {
+ fprintf(dump_file, "%s ",
+ get_static_name (index));
+ }
if (l->calls_read_all)
fprintf (dump_file, "\n calls read all: ");
if (l->calls_write_all)
}
}
\f
+/* Set READ_ALL/WRITE_ALL based on DECL flags. */
+static void
+read_write_all_from_decl (tree decl, bool * read_all, bool * write_all)
+{
+ int flags = flags_from_decl_or_type (decl);
+ if (flags & ECF_CONST)
+ ;
+ else if (flags & ECF_PURE)
+ *read_all = true;
+ else
+ {
+ /* TODO: To be able to produce sane results, we should also handle
+ common builtins, in particular throw.
+ Indirect calls hsould be only counted and as inliner is replacing them
+ by direct calls, we can conclude if any indirect calls are left in body */
+ *read_all = true;
+ /* When function does not reutrn, it is safe to ignore anythign it writes
+ to, because the effect will never happen. */
+ if ((flags & (ECF_NOTHROW | ECF_NORETURN))
+ != (ECF_NOTHROW | ECF_NORETURN))
+ *write_all = true;
+ }
+}
+
/* Produce the global information by preforming a transitive closure
on the local information that was produced by ipa_analyze_function
and ipa_analyze_variable. */
int order_pos = ipa_utils_reduced_inorder (order, false, true, NULL);
int i;
- cgraph_remove_function_insertion_hook (function_insertion_hook_holder);
- if (dump_file)
+ if (dump_file)
dump_cgraph (dump_file);
+ generate_summary ();
+
/* 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
for (i = 0; i < order_pos; i++ )
{
ipa_reference_vars_info_t node_info;
- ipa_reference_global_vars_info_t node_g =
+ ipa_reference_global_vars_info_t node_g =
XCNEW (struct ipa_reference_global_vars_info_d);
ipa_reference_local_vars_info_t node_l;
-
+ struct cgraph_edge *e;
+
bool read_all;
bool write_all;
struct ipa_dfs_info * w_info;
node = order[i];
node_info = get_reference_vars_info (node);
- if (!node_info)
+ if (!node_info)
{
dump_cgraph_node (stderr, node);
dump_cgraph (stderr);
read_all = node_l->calls_read_all;
write_all = node_l->calls_write_all;
+ /* When function is overwrittable, we can not assume anything. */
+ if (cgraph_function_body_availability (node) <= AVAIL_OVERWRITABLE)
+ read_write_all_from_decl (node->decl, &read_all, &write_all);
+
+ for (e = node->callees; e; e = e->next_callee)
+ if (cgraph_function_body_availability (e->callee) <= AVAIL_OVERWRITABLE)
+ read_write_all_from_decl (e->callee->decl, &read_all, &write_all);
+
+
/* If any node in a cycle is calls_read_all or calls_write_all
they all are. */
w_info = (struct ipa_dfs_info *) node->aux;
w = w_info->next_cycle;
while (w)
{
- ipa_reference_local_vars_info_t w_l =
+ ipa_reference_local_vars_info_t w_l =
get_reference_vars_info (w)->local;
+
+ /* When function is overwrittable, we can not assume anything. */
+ if (cgraph_function_body_availability (w) <= AVAIL_OVERWRITABLE)
+ read_write_all_from_decl (w->decl, &read_all, &write_all);
+
+ for (e = w->callees; e; e = e->next_callee)
+ if (cgraph_function_body_availability (e->callee) <= AVAIL_OVERWRITABLE)
+ read_write_all_from_decl (e->callee->decl, &read_all, &write_all);
+
read_all |= w_l->calls_read_all;
write_all |= w_l->calls_write_all;
w = w_info->next_cycle;
}
+
/* Initialized the bitmaps for the reduced nodes */
- if (read_all)
+ if (read_all)
node_g->statics_read = all_module_statics;
- else
+ else
{
node_g->statics_read = BITMAP_ALLOC (&global_info_obstack);
- bitmap_copy (node_g->statics_read,
+ bitmap_copy (node_g->statics_read,
node_l->statics_read);
}
-
- if (write_all)
+ if (write_all)
node_g->statics_written = all_module_statics;
else
{
node_g->statics_written = BITMAP_ALLOC (&global_info_obstack);
- bitmap_copy (node_g->statics_written,
+ bitmap_copy (node_g->statics_written,
node_l->statics_written);
}
w = w_info->next_cycle;
while (w)
{
- ipa_reference_vars_info_t w_ri =
+ ipa_reference_vars_info_t w_ri =
get_reference_vars_info (w);
ipa_reference_local_vars_info_t w_l = w_ri->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
w = w_info->next_cycle;
while (w)
{
- ipa_reference_vars_info_t w_ri =
+ ipa_reference_vars_info_t w_ri =
get_reference_vars_info (w);
gcc_assert (!w_ri->global);
node_info = get_reference_vars_info (node);
node_g = node_info->global;
node_l = node_info->local;
- fprintf (dump_file,
- "\nFunction name:%s/%i:",
+ fprintf (dump_file,
+ "\nFunction name:%s/%i:",
cgraph_node_name (node), node->uid);
fprintf (dump_file, "\n locals read: ");
- EXECUTE_IF_SET_IN_BITMAP (node_l->statics_read,
- 0, index, bi)
- {
- fprintf (dump_file, "%s ",
- get_static_name (index));
- }
+ if (node_l->statics_read)
+ EXECUTE_IF_SET_IN_BITMAP (node_l->statics_read,
+ 0, index, bi)
+ {
+ fprintf (dump_file, "%s ",
+ get_static_name (index));
+ }
fprintf (dump_file, "\n locals written: ");
- EXECUTE_IF_SET_IN_BITMAP (node_l->statics_written,
- 0, index, bi)
- {
- fprintf(dump_file, "%s ",
- get_static_name (index));
- }
+ if (node_l->statics_written)
+ EXECUTE_IF_SET_IN_BITMAP (node_l->statics_written,
+ 0, index, bi)
+ {
+ fprintf(dump_file, "%s ",
+ get_static_name (index));
+ }
w_info = (struct ipa_dfs_info *) node->aux;
w = w_info->next_cycle;
- while (w)
+ while (w)
{
- ipa_reference_vars_info_t w_ri =
+ ipa_reference_vars_info_t w_ri =
get_reference_vars_info (w);
ipa_reference_local_vars_info_t w_l = w_ri->local;
fprintf (dump_file, "\n next cycle: %s/%i ",
cgraph_node_name (w), w->uid);
- fprintf (dump_file, "\n locals read: ");
- EXECUTE_IF_SET_IN_BITMAP (w_l->statics_read,
- 0, index, bi)
- {
- fprintf (dump_file, "%s ",
- get_static_name (index));
- }
+ fprintf (dump_file, "\n locals read: ");
+ if (w_l->statics_read)
+ EXECUTE_IF_SET_IN_BITMAP (w_l->statics_read,
+ 0, index, bi)
+ {
+ fprintf (dump_file, "%s ",
+ get_static_name (index));
+ }
fprintf (dump_file, "\n locals written: ");
- EXECUTE_IF_SET_IN_BITMAP (w_l->statics_written,
- 0, index, bi)
- {
- fprintf(dump_file, "%s ",
- get_static_name (index));
- }
-
+ if (w_l->statics_written)
+ EXECUTE_IF_SET_IN_BITMAP (w_l->statics_written,
+ 0, index, bi)
+ {
+ fprintf (dump_file, "%s ",
+ get_static_name (index));
+ }
w_info = (struct ipa_dfs_info *) w->aux;
w = w_info->next_cycle;
}
fprintf (dump_file, "\n globals read: ");
- EXECUTE_IF_SET_IN_BITMAP (node_g->statics_read,
- 0, index, bi)
- {
- fprintf (dump_file, "%s ",
- get_static_name (index));
- }
+ if (node_g->statics_read == all_module_statics)
+ fprintf (dump_file, "ALL");
+ else
+ EXECUTE_IF_SET_IN_BITMAP (node_g->statics_read,
+ 0, index, bi)
+ {
+ fprintf (dump_file, "%s ",
+ get_static_name (index));
+ }
fprintf (dump_file, "\n globals written: ");
- EXECUTE_IF_SET_IN_BITMAP (node_g->statics_written,
- 0, index, bi)
- {
- fprintf (dump_file, "%s ",
- get_static_name (index));
- }
+ if (node_g->statics_written == all_module_statics)
+ fprintf (dump_file, "ALL");
+ else
+ EXECUTE_IF_SET_IN_BITMAP (node_g->statics_written,
+ 0, index, bi)
+ {
+ fprintf (dump_file, "%s ",
+ get_static_name (index));
+ }
}
}
node = order[i];
node_info = get_reference_vars_info (node);
node_g = node_info->global;
-
+
/* Create the complimentary sets. These are more useful for
certain apis. */
node_g->statics_not_read = BITMAP_ALLOC (&global_info_obstack);
node_g->statics_not_written = BITMAP_ALLOC (&global_info_obstack);
- if (node_g->statics_read != all_module_statics)
- bitmap_and_compl (node_g->statics_not_read,
+ if (node_g->statics_read != all_module_statics)
+ bitmap_and_compl (node_g->statics_not_read,
all_module_statics,
node_g->statics_read);
- if (node_g->statics_written
- != all_module_statics)
- bitmap_and_compl (node_g->statics_not_written,
+ if (node_g->statics_written
+ != all_module_statics)
+ bitmap_and_compl (node_g->statics_not_written,
all_module_statics,
node_g->statics_written);
}
ipa_reference_vars_info_t node_info;
node_info = get_reference_vars_info (node);
/* Get rid of the aux information. */
-
+
if (node->aux)
{
free (node->aux);
node->aux = NULL;
}
-
+
if (cgraph_function_body_availability (node) == AVAIL_OVERWRITABLE)
clean_function (node);
else if (node_info)
&& !(errorcount || sorrycount));
}
-struct ipa_opt_pass pass_ipa_reference =
+struct ipa_opt_pass_d pass_ipa_reference =
{
{
IPA_PASS,
0, /* todo_flags_start */
0 /* todo_flags_finish */
},
- generate_summary, /* generate_summary */
+ NULL, /* generate_summary */
NULL, /* write_summary */
- NULL, /* read_summary */
- NULL, /* function_read_summary */
+ NULL, /* read_summary */
+ NULL, /* write_optimization_summary */
+ NULL, /* read_optimization_summary */
+ NULL, /* stmt_fixup */
0, /* TODOs */
NULL, /* function_transform */
NULL /* variable_transform */
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