/* SSA operands management for trees.
- Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
+ Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
+the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to
-the Free Software Foundation, 51 Franklin Street, Fifth Floor,
-Boston, MA 02110-1301, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "flags.h"
#include "function.h"
#include "diagnostic.h"
+#include "tree-pretty-print.h"
+#include "gimple-pretty-print.h"
#include "tree-flow.h"
#include "tree-inline.h"
#include "tree-pass.h"
#include "langhooks.h"
#include "ipa-reference.h"
-/* This file contains the code required to manage the operands cache of the
- SSA optimizer. For every stmt, we maintain an operand cache in the stmt
- annotation. This cache contains operands that will be of interest to
- optimizers and other passes wishing to manipulate the IL.
+/* This file contains the code required to manage the operands cache of the
+ SSA optimizer. For every stmt, we maintain an operand cache in the stmt
+ annotation. This cache contains operands that will be of interest to
+ optimizers and other passes wishing to manipulate the IL.
- The operand type are broken up into REAL and VIRTUAL operands. The real
- operands are represented as pointers into the stmt's operand tree. Thus
+ The operand type are broken up into REAL and VIRTUAL operands. The real
+ operands are represented as pointers into the stmt's operand tree. Thus
any manipulation of the real operands will be reflected in the actual tree.
- Virtual operands are represented solely in the cache, although the base
- variable for the SSA_NAME may, or may not occur in the stmt's tree.
+ Virtual operands are represented solely in the cache, although the base
+ variable for the SSA_NAME may, or may not occur in the stmt's tree.
Manipulation of the virtual operands will not be reflected in the stmt tree.
- The routines in this file are concerned with creating this operand cache
+ The routines in this file are concerned with creating this operand cache
from a stmt tree.
- The operand tree is the parsed by the various get_* routines which look
- through the stmt tree for the occurrence of operands which may be of
- interest, and calls are made to the append_* routines whenever one is
- found. There are 5 of these routines, each representing one of the
- 5 types of operands. Defs, Uses, Virtual Uses, Virtual May Defs, and
- Virtual Must Defs.
+ The operand tree is the parsed by the various get_* routines which look
+ through the stmt tree for the occurrence of operands which may be of
+ interest, and calls are made to the append_* routines whenever one is
+ found. There are 4 of these routines, each representing one of the
+ 4 types of operands. Defs, Uses, Virtual Uses, and Virtual May Defs.
- The append_* routines check for duplication, and simply keep a list of
+ The append_* routines check for duplication, and simply keep a list of
unique objects for each operand type in the build_* extendable vectors.
- Once the stmt tree is completely parsed, the finalize_ssa_operands()
- routine is called, which proceeds to perform the finalization routine
- on each of the 5 operand vectors which have been built up.
+ Once the stmt tree is completely parsed, the finalize_ssa_operands()
+ routine is called, which proceeds to perform the finalization routine
+ on each of the 4 operand vectors which have been built up.
- If the stmt had a previous operand cache, the finalization routines
- attempt to match up the new operands with the old ones. If it's a perfect
- match, the old vector is simply reused. If it isn't a perfect match, then
- a new vector is created and the new operands are placed there. For
- virtual operands, if the previous cache had SSA_NAME version of a
- variable, and that same variable occurs in the same operands cache, then
+ If the stmt had a previous operand cache, the finalization routines
+ attempt to match up the new operands with the old ones. If it's a perfect
+ match, the old vector is simply reused. If it isn't a perfect match, then
+ a new vector is created and the new operands are placed there. For
+ virtual operands, if the previous cache had SSA_NAME version of a
+ variable, and that same variable occurs in the same operands cache, then
the new cache vector will also get the same SSA_NAME.
- i.e., if a stmt had a VUSE of 'a_5', and 'a' occurs in the new operand
- vector for VUSE, then the new vector will also be modified such that
- it contains 'a_5' rather than 'a'. */
+ i.e., if a stmt had a VUSE of 'a_5', and 'a' occurs in the new
+ operand vector for VUSE, then the new vector will also be modified
+ such that it contains 'a_5' rather than 'a'. */
+
+/* Structure storing statistics on how many call clobbers we have, and
+ how many where avoided. */
+
+static struct
+{
+ /* Number of call-clobbered ops we attempt to add to calls in
+ add_call_clobbered_mem_symbols. */
+ unsigned int clobbered_vars;
+
+ /* Number of write-clobbers (VDEFs) avoided by using
+ not_written information. */
+ unsigned int static_write_clobbers_avoided;
+
+ /* Number of reads (VUSEs) avoided by using not_read information. */
+ unsigned int static_read_clobbers_avoided;
+
+ /* Number of write-clobbers avoided because the variable can't escape to
+ this call. */
+ unsigned int unescapable_clobbers_avoided;
+
+ /* Number of read-only uses we attempt to add to calls in
+ add_call_read_mem_symbols. */
+ unsigned int readonly_clobbers;
+
+ /* Number of read-only uses we avoid using not_read information. */
+ unsigned int static_readonly_clobbers_avoided;
+} clobber_stats;
+
/* Flags to describe operand properties in helpers. */
/* By default, operands are loaded. */
-#define opf_none 0
+#define opf_use 0
-/* Operand is the target of an assignment expression or a
+/* Operand is the target of an assignment expression or a
call-clobbered variable. */
-#define opf_is_def (1 << 0)
-
-/* Operand is the target of an assignment expression. */
-#define opf_kill_def (1 << 1)
+#define opf_def (1 << 0)
/* No virtual operands should be created in the expression. This is used
when traversing ADDR_EXPR nodes which have different semantics than
need to consider are indices into arrays. For instance, &a.b[i] should
generate a USE of 'i' but it should not generate a VUSE for 'a' nor a
VUSE for 'b'. */
-#define opf_no_vops (1 << 2)
+#define opf_no_vops (1 << 1)
-/* Operand is a "non-specific" kill for call-clobbers and such. This
- is used to distinguish "reset the world" events from explicit
- GIMPLE_MODIFY_STMTs. */
-#define opf_non_specific (1 << 3)
+/* Operand is an implicit reference. This is used to distinguish
+ explicit assignments in the form of MODIFY_EXPR from
+ clobbering sites like function calls or ASM_EXPRs. */
+#define opf_implicit (1 << 2)
/* Array for building all the def operands. */
static VEC(tree,heap) *build_defs;
/* Array for building all the use operands. */
static VEC(tree,heap) *build_uses;
-/* Array for building all the V_MAY_DEF operands. */
-static VEC(tree,heap) *build_v_may_defs;
+/* The built VDEF operand. */
+static tree build_vdef;
-/* Array for building all the VUSE operands. */
-static VEC(tree,heap) *build_vuses;
+/* The built VUSE operand. */
+static tree build_vuse;
-/* Array for building all the V_MUST_DEF operands. */
-static VEC(tree,heap) *build_v_must_defs;
+/* Bitmap obstack for our datastructures that needs to survive across
+ compilations of multiple functions. */
+static bitmap_obstack operands_bitmap_obstack;
-static void get_expr_operands (tree, tree *, int);
+static void get_expr_operands (gimple, tree *, int);
/* Number of functions with initialized ssa_operands. */
static int n_initialized = 0;
-/* Allocates operand OP of given TYPE from the appropriate free list,
- or of the new value if the list is empty. */
-
-#define ALLOC_OPTYPE(OP, TYPE) \
- do \
- { \
- TYPE##_optype_p ret \
- = gimple_ssa_operands (cfun)->free_##TYPE##s; \
- if (ret) \
- gimple_ssa_operands (cfun)->free_##TYPE##s \
- = ret->next; \
- else \
- ret = ssa_operand_alloc (sizeof (*ret)); \
- (OP) = ret; \
- } while (0)
-
/* Return the DECL_UID of the base variable of T. */
static inline unsigned
-get_name_decl (tree t)
+get_name_decl (const_tree t)
{
if (TREE_CODE (t) != SSA_NAME)
return DECL_UID (t);
}
-/* Comparison function for qsort used in operand_build_sort_virtual. */
-
-static int
-operand_build_cmp (const void *p, const void *q)
-{
- tree e1 = *((const tree *)p);
- tree e2 = *((const tree *)q);
- unsigned int u1,u2;
-
- u1 = get_name_decl (e1);
- u2 = get_name_decl (e2);
-
- /* We want to sort in ascending order. They can never be equal. */
-#ifdef ENABLE_CHECKING
- gcc_assert (u1 != u2);
-#endif
- return (u1 > u2 ? 1 : -1);
-}
-
-
-/* Sort the virtual operands in LIST from lowest DECL_UID to highest. */
-
-static inline void
-operand_build_sort_virtual (VEC(tree,heap) *list)
-{
- int num = VEC_length (tree, list);
-
- if (num < 2)
- return;
-
- if (num == 2)
- {
- if (get_name_decl (VEC_index (tree, list, 0))
- > get_name_decl (VEC_index (tree, list, 1)))
- {
- /* Swap elements if in the wrong order. */
- tree tmp = VEC_index (tree, list, 0);
- VEC_replace (tree, list, 0, VEC_index (tree, list, 1));
- VEC_replace (tree, list, 1, tmp);
- }
- return;
- }
-
- /* There are 3 or more elements, call qsort. */
- qsort (VEC_address (tree, list),
- VEC_length (tree, list),
- sizeof (tree),
- operand_build_cmp);
-}
-
-
/* Return true if the SSA operands cache is active. */
bool
ssa_operands_active (void)
{
+ /* This function may be invoked from contexts where CFUN is NULL
+ (IPA passes), return false for now. FIXME: operands may be
+ active in each individual function, maybe this function should
+ take CFUN as a parameter. */
+ if (cfun == NULL)
+ return false;
+
return cfun->gimple_df && gimple_ssa_operands (cfun)->ops_active;
}
-/* Structure storing statistics on how many call clobbers we have, and
- how many where avoided. */
+/* Create the VOP variable, an artificial global variable to act as a
+ representative of all of the virtual operands FUD chain. */
-static struct
+static void
+create_vop_var (void)
{
- /* Number of call-clobbered ops we attempt to add to calls in
- add_call_clobber_ops. */
- unsigned int clobbered_vars;
-
- /* Number of write-clobbers (V_MAY_DEFs) avoided by using
- not_written information. */
- unsigned int static_write_clobbers_avoided;
-
- /* Number of reads (VUSEs) avoided by using not_read information. */
- unsigned int static_read_clobbers_avoided;
-
- /* Number of write-clobbers avoided because the variable can't escape to
- this call. */
- unsigned int unescapable_clobbers_avoided;
+ tree global_var;
+
+ gcc_assert (cfun->gimple_df->vop == NULL_TREE);
+
+ global_var = build_decl (BUILTINS_LOCATION, VAR_DECL,
+ get_identifier (".MEM"),
+ void_type_node);
+ DECL_ARTIFICIAL (global_var) = 1;
+ TREE_READONLY (global_var) = 0;
+ DECL_EXTERNAL (global_var) = 1;
+ TREE_STATIC (global_var) = 1;
+ TREE_USED (global_var) = 1;
+ DECL_CONTEXT (global_var) = NULL_TREE;
+ TREE_THIS_VOLATILE (global_var) = 0;
+ TREE_ADDRESSABLE (global_var) = 0;
+
+ create_var_ann (global_var);
+ add_referenced_var (global_var);
+ cfun->gimple_df->vop = global_var;
+}
- /* Number of read-only uses we attempt to add to calls in
- add_call_read_ops. */
- unsigned int readonly_clobbers;
+/* These are the sizes of the operand memory buffer in bytes which gets
+ allocated each time more operands space is required. The final value is
+ the amount that is allocated every time after that.
+ In 1k we can fit 25 use operands (or 63 def operands) on a host with
+ 8 byte pointers, that would be 10 statements each with 1 def and 2
+ uses. */
- /* Number of read-only uses we avoid using not_read information. */
- unsigned int static_readonly_clobbers_avoided;
-} clobber_stats;
-
+#define OP_SIZE_INIT 0
+#define OP_SIZE_1 (1024 - sizeof (void *))
+#define OP_SIZE_2 (1024 * 4 - sizeof (void *))
+#define OP_SIZE_3 (1024 * 16 - sizeof (void *))
/* Initialize the operand cache routines. */
{
build_defs = VEC_alloc (tree, heap, 5);
build_uses = VEC_alloc (tree, heap, 10);
- build_vuses = VEC_alloc (tree, heap, 25);
- build_v_may_defs = VEC_alloc (tree, heap, 25);
- build_v_must_defs = VEC_alloc (tree, heap, 25);
+ build_vuse = NULL_TREE;
+ build_vdef = NULL_TREE;
+ bitmap_obstack_initialize (&operands_bitmap_obstack);
}
gcc_assert (gimple_ssa_operands (cfun)->operand_memory == NULL);
- gimple_ssa_operands (cfun)->operand_memory_index = SSA_OPERAND_MEMORY_SIZE;
+ gimple_ssa_operands (cfun)->operand_memory_index
+ = gimple_ssa_operands (cfun)->ssa_operand_mem_size;
gimple_ssa_operands (cfun)->ops_active = true;
memset (&clobber_stats, 0, sizeof (clobber_stats));
+ gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_INIT;
+ create_vop_var ();
}
fini_ssa_operands (void)
{
struct ssa_operand_memory_d *ptr;
+
if (!--n_initialized)
{
VEC_free (tree, heap, build_defs);
VEC_free (tree, heap, build_uses);
- VEC_free (tree, heap, build_v_must_defs);
- VEC_free (tree, heap, build_v_may_defs);
- VEC_free (tree, heap, build_vuses);
+ build_vdef = NULL_TREE;
+ build_vuse = NULL_TREE;
}
+
gimple_ssa_operands (cfun)->free_defs = NULL;
gimple_ssa_operands (cfun)->free_uses = NULL;
- gimple_ssa_operands (cfun)->free_vuses = NULL;
- gimple_ssa_operands (cfun)->free_maydefs = NULL;
- gimple_ssa_operands (cfun)->free_mustdefs = NULL;
+
while ((ptr = gimple_ssa_operands (cfun)->operand_memory) != NULL)
{
gimple_ssa_operands (cfun)->operand_memory
}
gimple_ssa_operands (cfun)->ops_active = false;
-
+
+ if (!n_initialized)
+ bitmap_obstack_release (&operands_bitmap_obstack);
+
+ cfun->gimple_df->vop = NULL_TREE;
+
if (dump_file && (dump_flags & TDF_STATS))
{
- fprintf (dump_file, "Original clobbered vars:%d\n",
+ fprintf (dump_file, "Original clobbered vars: %d\n",
clobber_stats.clobbered_vars);
- fprintf (dump_file, "Static write clobbers avoided:%d\n",
+ fprintf (dump_file, "Static write clobbers avoided: %d\n",
clobber_stats.static_write_clobbers_avoided);
- fprintf (dump_file, "Static read clobbers avoided:%d\n",
+ fprintf (dump_file, "Static read clobbers avoided: %d\n",
clobber_stats.static_read_clobbers_avoided);
- fprintf (dump_file, "Unescapable clobbers avoided:%d\n",
+ fprintf (dump_file, "Unescapable clobbers avoided: %d\n",
clobber_stats.unescapable_clobbers_avoided);
- fprintf (dump_file, "Original read-only clobbers:%d\n",
+ fprintf (dump_file, "Original read-only clobbers: %d\n",
clobber_stats.readonly_clobbers);
- fprintf (dump_file, "Static read-only clobbers avoided:%d\n",
+ fprintf (dump_file, "Static read-only clobbers avoided: %d\n",
clobber_stats.static_readonly_clobbers_avoided);
}
}
-/* Return memory for operands of SIZE chunks. */
-
+/* Return memory for an operand of size SIZE. */
+
static inline void *
ssa_operand_alloc (unsigned size)
{
char *ptr;
+
+ gcc_assert (size == sizeof (struct use_optype_d)
+ || size == sizeof (struct def_optype_d));
+
if (gimple_ssa_operands (cfun)->operand_memory_index + size
- >= SSA_OPERAND_MEMORY_SIZE)
+ >= gimple_ssa_operands (cfun)->ssa_operand_mem_size)
{
struct ssa_operand_memory_d *ptr;
- ptr = GGC_NEW (struct ssa_operand_memory_d);
+
+ switch (gimple_ssa_operands (cfun)->ssa_operand_mem_size)
+ {
+ case OP_SIZE_INIT:
+ gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_1;
+ break;
+ case OP_SIZE_1:
+ gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_2;
+ break;
+ case OP_SIZE_2:
+ case OP_SIZE_3:
+ gimple_ssa_operands (cfun)->ssa_operand_mem_size = OP_SIZE_3;
+ break;
+ default:
+ gcc_unreachable ();
+ }
+
+ ptr = (struct ssa_operand_memory_d *)
+ ggc_alloc (sizeof (void *)
+ + gimple_ssa_operands (cfun)->ssa_operand_mem_size);
ptr->next = gimple_ssa_operands (cfun)->operand_memory;
gimple_ssa_operands (cfun)->operand_memory = ptr;
gimple_ssa_operands (cfun)->operand_memory_index = 0;
}
+
ptr = &(gimple_ssa_operands (cfun)->operand_memory
->mem[gimple_ssa_operands (cfun)->operand_memory_index]);
gimple_ssa_operands (cfun)->operand_memory_index += size;
}
+/* Allocate a DEF operand. */
-/* This routine makes sure that PTR is in an immediate use list, and makes
- sure the stmt pointer is set to the current stmt. */
-
-static inline void
-set_virtual_use_link (use_operand_p ptr, tree stmt)
+static inline struct def_optype_d *
+alloc_def (void)
{
- /* fold_stmt may have changed the stmt pointers. */
- if (ptr->stmt != stmt)
- ptr->stmt = stmt;
-
- /* If this use isn't in a list, add it to the correct list. */
- if (!ptr->prev)
- link_imm_use (ptr, *(ptr->use));
+ struct def_optype_d *ret;
+ if (gimple_ssa_operands (cfun)->free_defs)
+ {
+ ret = gimple_ssa_operands (cfun)->free_defs;
+ gimple_ssa_operands (cfun)->free_defs
+ = gimple_ssa_operands (cfun)->free_defs->next;
+ }
+ else
+ ret = (struct def_optype_d *)
+ ssa_operand_alloc (sizeof (struct def_optype_d));
+ return ret;
}
-/* Appends ELT after TO, and moves the TO pointer to ELT. */
-
-#define APPEND_OP_AFTER(ELT, TO) \
- do \
- { \
- (TO)->next = (ELT); \
- (TO) = (ELT); \
- } while (0)
-
-/* Appends head of list FROM after TO, and move both pointers
- to their successors. */
-
-#define MOVE_HEAD_AFTER(FROM, TO) \
- do \
- { \
- APPEND_OP_AFTER (FROM, TO); \
- (FROM) = (FROM)->next; \
- } while (0)
-
-/* Moves OP to appropriate freelist. OP is set to its successor. */
-
-#define MOVE_HEAD_TO_FREELIST(OP, TYPE) \
- do \
- { \
- TYPE##_optype_p next = (OP)->next; \
- (OP)->next \
- = gimple_ssa_operands (cfun)->free_##TYPE##s; \
- gimple_ssa_operands (cfun)->free_##TYPE##s = (OP);\
- (OP) = next; \
- } while (0)
-
-/* Initializes immediate use at USE_PTR to value VAL, and links it to the list
- of immediate uses. STMT is the current statement. */
-
-#define INITIALIZE_USE(USE_PTR, VAL, STMT) \
- do \
- { \
- (USE_PTR)->use = (VAL); \
- link_imm_use_stmt ((USE_PTR), *(VAL), (STMT)); \
- } while (0)
-
-/* Adds OP to the list of defs after LAST, and moves
- LAST to the new element. */
-
-static inline void
-add_def_op (tree *op, def_optype_p *last)
-{
- def_optype_p new;
-
- ALLOC_OPTYPE (new, def);
- DEF_OP_PTR (new) = op;
- APPEND_OP_AFTER (new, *last);
-}
-/* Adds OP to the list of uses of statement STMT after LAST, and moves
- LAST to the new element. */
+/* Allocate a USE operand. */
-static inline void
-add_use_op (tree stmt, tree *op, use_optype_p *last)
+static inline struct use_optype_d *
+alloc_use (void)
{
- use_optype_p new;
-
- ALLOC_OPTYPE (new, use);
- INITIALIZE_USE (USE_OP_PTR (new), op, stmt);
- APPEND_OP_AFTER (new, *last);
+ struct use_optype_d *ret;
+ if (gimple_ssa_operands (cfun)->free_uses)
+ {
+ ret = gimple_ssa_operands (cfun)->free_uses;
+ gimple_ssa_operands (cfun)->free_uses
+ = gimple_ssa_operands (cfun)->free_uses->next;
+ }
+ else
+ ret = (struct use_optype_d *)
+ ssa_operand_alloc (sizeof (struct use_optype_d));
+ return ret;
}
-/* Adds OP to the list of vuses of statement STMT after LAST, and moves
- LAST to the new element. */
-static inline void
-add_vuse_op (tree stmt, tree op, vuse_optype_p *last)
+/* Adds OP to the list of defs after LAST. */
+
+static inline def_optype_p
+add_def_op (tree *op, def_optype_p last)
{
- vuse_optype_p new;
+ def_optype_p new_def;
- ALLOC_OPTYPE (new, vuse);
- VUSE_OP (new) = op;
- INITIALIZE_USE (VUSE_OP_PTR (new), &VUSE_OP (new), stmt);
- APPEND_OP_AFTER (new, *last);
+ new_def = alloc_def ();
+ DEF_OP_PTR (new_def) = op;
+ last->next = new_def;
+ new_def->next = NULL;
+ return new_def;
}
-/* Adds OP to the list of maydefs of statement STMT after LAST, and moves
- LAST to the new element. */
-static inline void
-add_maydef_op (tree stmt, tree op, maydef_optype_p *last)
-{
- maydef_optype_p new;
+/* Adds OP to the list of uses of statement STMT after LAST. */
- ALLOC_OPTYPE (new, maydef);
- MAYDEF_RESULT (new) = op;
- MAYDEF_OP (new) = op;
- INITIALIZE_USE (MAYDEF_OP_PTR (new), &MAYDEF_OP (new), stmt);
- APPEND_OP_AFTER (new, *last);
+static inline use_optype_p
+add_use_op (gimple stmt, tree *op, use_optype_p last)
+{
+ use_optype_p new_use;
+
+ new_use = alloc_use ();
+ USE_OP_PTR (new_use)->use = op;
+ link_imm_use_stmt (USE_OP_PTR (new_use), *op, stmt);
+ last->next = new_use;
+ new_use->next = NULL;
+ return new_use;
}
-/* Adds OP to the list of mustdefs of statement STMT after LAST, and moves
- LAST to the new element. */
-static inline void
-add_mustdef_op (tree stmt, tree op, mustdef_optype_p *last)
-{
- mustdef_optype_p new;
-
- ALLOC_OPTYPE (new, mustdef);
- MUSTDEF_RESULT (new) = op;
- MUSTDEF_KILL (new) = op;
- INITIALIZE_USE (MUSTDEF_KILL_PTR (new), &MUSTDEF_KILL (new), stmt);
- APPEND_OP_AFTER (new, *last);
-}
/* Takes elements from build_defs and turns them into def operands of STMT.
- TODO -- Given that def operands list is not necessarily sorted, merging
- the operands this way does not make much sense.
- -- Make build_defs VEC of tree *. */
+ TODO -- Make build_defs VEC of tree *. */
static inline void
-finalize_ssa_def_ops (tree stmt)
+finalize_ssa_defs (gimple stmt)
{
unsigned new_i;
struct def_optype_d new_list;
def_optype_p old_ops, last;
- tree *old_base;
+ unsigned int num = VEC_length (tree, build_defs);
+
+ /* There should only be a single real definition per assignment. */
+ gcc_assert ((stmt && gimple_code (stmt) != GIMPLE_ASSIGN) || num <= 1);
+
+ /* Pre-pend the vdef we may have built. */
+ if (build_vdef != NULL_TREE)
+ {
+ tree oldvdef = gimple_vdef (stmt);
+ if (oldvdef
+ && TREE_CODE (oldvdef) == SSA_NAME)
+ oldvdef = SSA_NAME_VAR (oldvdef);
+ if (oldvdef != build_vdef)
+ gimple_set_vdef (stmt, build_vdef);
+ VEC_safe_insert (tree, heap, build_defs, 0, (tree)gimple_vdef_ptr (stmt));
+ ++num;
+ }
new_list.next = NULL;
last = &new_list;
- old_ops = DEF_OPS (stmt);
+ old_ops = gimple_def_ops (stmt);
new_i = 0;
- while (old_ops && new_i < VEC_length (tree, build_defs))
- {
- tree *new_base = (tree *) VEC_index (tree, build_defs, new_i);
- old_base = DEF_OP_PTR (old_ops);
- if (old_base == new_base)
- {
- /* if variables are the same, reuse this node. */
- MOVE_HEAD_AFTER (old_ops, last);
- new_i++;
- }
- else if (old_base < new_base)
- {
- /* if old is less than new, old goes to the free list. */
- MOVE_HEAD_TO_FREELIST (old_ops, def);
- }
- else
+ /* Clear and unlink a no longer necessary VDEF. */
+ if (build_vdef == NULL_TREE
+ && gimple_vdef (stmt) != NULL_TREE)
+ {
+ if (TREE_CODE (gimple_vdef (stmt)) == SSA_NAME)
{
- /* This is a new operand. */
- add_def_op (new_base, &last);
- new_i++;
+ unlink_stmt_vdef (stmt);
+ release_ssa_name (gimple_vdef (stmt));
}
+ gimple_set_vdef (stmt, NULL_TREE);
}
- /* If there is anything remaining in the build_defs list, simply emit it. */
- for ( ; new_i < VEC_length (tree, build_defs); new_i++)
- add_def_op ((tree *) VEC_index (tree, build_defs, new_i), &last);
+ /* If we have a non-SSA_NAME VDEF, mark it for renaming. */
+ if (gimple_vdef (stmt)
+ && TREE_CODE (gimple_vdef (stmt)) != SSA_NAME)
+ mark_sym_for_renaming (gimple_vdef (stmt));
- last->next = NULL;
+ /* Check for the common case of 1 def that hasn't changed. */
+ if (old_ops && old_ops->next == NULL && num == 1
+ && (tree *) VEC_index (tree, build_defs, 0) == DEF_OP_PTR (old_ops))
+ return;
/* If there is anything in the old list, free it. */
if (old_ops)
gimple_ssa_operands (cfun)->free_defs = old_ops;
}
- /* Now set the stmt's operands. */
- DEF_OPS (stmt) = new_list.next;
+ /* If there is anything remaining in the build_defs list, simply emit it. */
+ for ( ; new_i < num; new_i++)
+ last = add_def_op ((tree *) VEC_index (tree, build_defs, new_i), last);
-#ifdef ENABLE_CHECKING
- {
- def_optype_p ptr;
- unsigned x = 0;
- for (ptr = DEF_OPS (stmt); ptr; ptr = ptr->next)
- x++;
-
- gcc_assert (x == VEC_length (tree, build_defs));
- }
-#endif
+ /* Now set the stmt's operands. */
+ gimple_set_def_ops (stmt, new_list.next);
}
-/* This routine will create stmt operands for STMT from the def build list. */
-
-static void
-finalize_ssa_defs (tree stmt)
-{
- unsigned int num = VEC_length (tree, build_defs);
-
- /* There should only be a single real definition per assignment. */
- gcc_assert ((stmt && TREE_CODE (stmt) != GIMPLE_MODIFY_STMT) || num <= 1);
-
- /* If there is an old list, often the new list is identical, or close, so
- find the elements at the beginning that are the same as the vector. */
- finalize_ssa_def_ops (stmt);
- VEC_truncate (tree, build_defs, 0);
-}
/* Takes elements from build_uses and turns them into use operands of STMT.
TODO -- Make build_uses VEC of tree *. */
static inline void
-finalize_ssa_use_ops (tree stmt)
+finalize_ssa_uses (gimple stmt)
{
unsigned new_i;
struct use_optype_d new_list;
use_optype_p old_ops, ptr, last;
- new_list.next = NULL;
- last = &new_list;
-
- old_ops = USE_OPS (stmt);
-
- /* If there is anything in the old list, free it. */
- if (old_ops)
+ /* Pre-pend the VUSE we may have built. */
+ if (build_vuse != NULL_TREE)
{
- for (ptr = old_ops; ptr; ptr = ptr->next)
- delink_imm_use (USE_OP_PTR (ptr));
- old_ops->next = gimple_ssa_operands (cfun)->free_uses;
- gimple_ssa_operands (cfun)->free_uses = old_ops;
+ tree oldvuse = gimple_vuse (stmt);
+ if (oldvuse
+ && TREE_CODE (oldvuse) == SSA_NAME)
+ oldvuse = SSA_NAME_VAR (oldvuse);
+ if (oldvuse != (build_vuse != NULL_TREE
+ ? build_vuse : build_vdef))
+ gimple_set_vuse (stmt, NULL_TREE);
+ VEC_safe_insert (tree, heap, build_uses, 0, (tree)gimple_vuse_ptr (stmt));
}
- /* Now create nodes for all the new nodes. */
- for (new_i = 0; new_i < VEC_length (tree, build_uses); new_i++)
- add_use_op (stmt, (tree *) VEC_index (tree, build_uses, new_i), &last);
-
- last->next = NULL;
-
- /* Now set the stmt's operands. */
- USE_OPS (stmt) = new_list.next;
-
-#ifdef ENABLE_CHECKING
- {
- unsigned x = 0;
- for (ptr = USE_OPS (stmt); ptr; ptr = ptr->next)
- x++;
-
- gcc_assert (x == VEC_length (tree, build_uses));
- }
-#endif
-}
-
-/* Return a new use operand vector for STMT, comparing to OLD_OPS_P. */
-
-static void
-finalize_ssa_uses (tree stmt)
-{
-#ifdef ENABLE_CHECKING
- {
- unsigned x;
- unsigned num = VEC_length (tree, build_uses);
-
- /* If the pointer to the operand is the statement itself, something is
- wrong. It means that we are pointing to a local variable (the
- initial call to update_stmt_operands does not pass a pointer to a
- statement). */
- for (x = 0; x < num; x++)
- gcc_assert (*((tree *)VEC_index (tree, build_uses, x)) != stmt);
- }
-#endif
- finalize_ssa_use_ops (stmt);
- VEC_truncate (tree, build_uses, 0);
-}
-
-
-/* Takes elements from build_v_may_defs and turns them into maydef operands of
- STMT. */
-
-static inline void
-finalize_ssa_v_may_def_ops (tree stmt)
-{
- unsigned new_i;
- struct maydef_optype_d new_list;
- maydef_optype_p old_ops, ptr, last;
- tree act;
- unsigned old_base, new_base;
-
new_list.next = NULL;
last = &new_list;
- old_ops = MAYDEF_OPS (stmt);
-
- new_i = 0;
- while (old_ops && new_i < VEC_length (tree, build_v_may_defs))
- {
- act = VEC_index (tree, build_v_may_defs, new_i);
- new_base = get_name_decl (act);
- old_base = get_name_decl (MAYDEF_OP (old_ops));
-
- if (old_base == new_base)
- {
- /* if variables are the same, reuse this node. */
- MOVE_HEAD_AFTER (old_ops, last);
- set_virtual_use_link (MAYDEF_OP_PTR (last), stmt);
- new_i++;
- }
- else if (old_base < new_base)
- {
- /* if old is less than new, old goes to the free list. */
- delink_imm_use (MAYDEF_OP_PTR (old_ops));
- MOVE_HEAD_TO_FREELIST (old_ops, maydef);
- }
- else
- {
- /* This is a new operand. */
- add_maydef_op (stmt, act, &last);
- new_i++;
- }
- }
-
- /* If there is anything remaining in the build_v_may_defs list, simply emit it. */
- for ( ; new_i < VEC_length (tree, build_v_may_defs); new_i++)
- add_maydef_op (stmt, VEC_index (tree, build_v_may_defs, new_i), &last);
+ old_ops = gimple_use_ops (stmt);
- last->next = NULL;
+ /* Clear a no longer necessary VUSE. */
+ if (build_vuse == NULL_TREE
+ && gimple_vuse (stmt) != NULL_TREE)
+ gimple_set_vuse (stmt, NULL_TREE);
/* If there is anything in the old list, free it. */
if (old_ops)
{
for (ptr = old_ops; ptr; ptr = ptr->next)
- delink_imm_use (MAYDEF_OP_PTR (ptr));
- old_ops->next = gimple_ssa_operands (cfun)->free_maydefs;
- gimple_ssa_operands (cfun)->free_maydefs = old_ops;
+ delink_imm_use (USE_OP_PTR (ptr));
+ old_ops->next = gimple_ssa_operands (cfun)->free_uses;
+ gimple_ssa_operands (cfun)->free_uses = old_ops;
}
- /* Now set the stmt's operands. */
- MAYDEF_OPS (stmt) = new_list.next;
-
-#ifdef ENABLE_CHECKING
- {
- unsigned x = 0;
- for (ptr = MAYDEF_OPS (stmt); ptr; ptr = ptr->next)
- x++;
-
- gcc_assert (x == VEC_length (tree, build_v_may_defs));
- }
-#endif
-}
-
-static void
-finalize_ssa_v_may_defs (tree stmt)
-{
- finalize_ssa_v_may_def_ops (stmt);
-}
-
-
-/* Clear the in_list bits and empty the build array for V_MAY_DEFs. */
-
-static inline void
-cleanup_v_may_defs (void)
-{
- unsigned x, num;
- num = VEC_length (tree, build_v_may_defs);
-
- for (x = 0; x < num; x++)
+ /* If we added a VUSE, make sure to set the operand if it is not already
+ present and mark it for renaming. */
+ if (build_vuse != NULL_TREE
+ && gimple_vuse (stmt) == NULL_TREE)
{
- tree t = VEC_index (tree, build_v_may_defs, x);
- if (TREE_CODE (t) != SSA_NAME)
- {
- var_ann_t ann = var_ann (t);
- ann->in_v_may_def_list = 0;
- }
+ gimple_set_vuse (stmt, gimple_vop (cfun));
+ mark_sym_for_renaming (gimple_vop (cfun));
}
- VEC_truncate (tree, build_v_may_defs, 0);
-}
-
-
-/* Takes elements from build_vuses and turns them into vuse operands of
- STMT. */
-static inline void
-finalize_ssa_vuse_ops (tree stmt)
-{
- unsigned new_i;
- struct vuse_optype_d new_list;
- vuse_optype_p old_ops, ptr, last;
- tree act;
- unsigned old_base, new_base;
-
- new_list.next = NULL;
- last = &new_list;
-
- old_ops = VUSE_OPS (stmt);
-
- new_i = 0;
- while (old_ops && new_i < VEC_length (tree, build_vuses))
- {
- act = VEC_index (tree, build_vuses, new_i);
- new_base = get_name_decl (act);
- old_base = get_name_decl (VUSE_OP (old_ops));
-
- if (old_base == new_base)
- {
- /* if variables are the same, reuse this node. */
- MOVE_HEAD_AFTER (old_ops, last);
- set_virtual_use_link (VUSE_OP_PTR (last), stmt);
- new_i++;
- }
- else if (old_base < new_base)
- {
- /* if old is less than new, old goes to the free list. */
- delink_imm_use (USE_OP_PTR (old_ops));
- MOVE_HEAD_TO_FREELIST (old_ops, vuse);
- }
- else
- {
- /* This is a new operand. */
- add_vuse_op (stmt, act, &last);
- new_i++;
- }
- }
-
- /* If there is anything remaining in the build_vuses list, simply emit it. */
- for ( ; new_i < VEC_length (tree, build_vuses); new_i++)
- add_vuse_op (stmt, VEC_index (tree, build_vuses, new_i), &last);
-
- last->next = NULL;
-
- /* If there is anything in the old list, free it. */
- if (old_ops)
- {
- for (ptr = old_ops; ptr; ptr = ptr->next)
- delink_imm_use (VUSE_OP_PTR (ptr));
- old_ops->next = gimple_ssa_operands (cfun)->free_vuses;
- gimple_ssa_operands (cfun)->free_vuses = old_ops;
- }
+ /* Now create nodes for all the new nodes. */
+ for (new_i = 0; new_i < VEC_length (tree, build_uses); new_i++)
+ last = add_use_op (stmt,
+ (tree *) VEC_index (tree, build_uses, new_i),
+ last);
/* Now set the stmt's operands. */
- VUSE_OPS (stmt) = new_list.next;
-
-#ifdef ENABLE_CHECKING
- {
- unsigned x = 0;
- for (ptr = VUSE_OPS (stmt); ptr; ptr = ptr->next)
- x++;
-
- gcc_assert (x == VEC_length (tree, build_vuses));
- }
-#endif
+ gimple_set_use_ops (stmt, new_list.next);
}
-
-/* Return a new VUSE operand vector, comparing to OLD_OPS_P. */
-
-static void
-finalize_ssa_vuses (tree stmt)
-{
- unsigned num, num_v_may_defs;
- unsigned vuse_index;
-
- /* Remove superfluous VUSE operands. If the statement already has a
- V_MAY_DEF operation for a variable 'a', then a VUSE for 'a' is
- not needed because V_MAY_DEFs imply a VUSE of the variable. For
- instance, suppose that variable 'a' is aliased:
-
- # VUSE <a_2>
- # a_3 = V_MAY_DEF <a_2>
- a = a + 1;
-
- The VUSE <a_2> is superfluous because it is implied by the
- V_MAY_DEF operation. */
- num = VEC_length (tree, build_vuses);
- num_v_may_defs = VEC_length (tree, build_v_may_defs);
-
- if (num > 0 && num_v_may_defs > 0)
- {
- for (vuse_index = 0; vuse_index < VEC_length (tree, build_vuses); )
- {
- tree vuse;
- vuse = VEC_index (tree, build_vuses, vuse_index);
- if (TREE_CODE (vuse) != SSA_NAME)
- {
- var_ann_t ann = var_ann (vuse);
- ann->in_vuse_list = 0;
- if (ann->in_v_may_def_list)
- {
- VEC_ordered_remove (tree, build_vuses, vuse_index);
- continue;
- }
- }
- vuse_index++;
- }
- }
- else
- {
- /* Clear out the in_list bits. */
- for (vuse_index = 0;
- vuse_index < VEC_length (tree, build_vuses);
- vuse_index++)
- {
- tree t = VEC_index (tree, build_vuses, vuse_index);
- if (TREE_CODE (t) != SSA_NAME)
- {
- var_ann_t ann = var_ann (t);
- ann->in_vuse_list = 0;
- }
- }
- }
-
- finalize_ssa_vuse_ops (stmt);
-
- /* The V_MAY_DEF build vector wasn't cleaned up because we needed it. */
- cleanup_v_may_defs ();
-
- /* Free the VUSEs build vector. */
- VEC_truncate (tree, build_vuses, 0);
-}
-/* Takes elements from build_v_must_defs and turns them into mustdef operands of
- STMT. */
+/* Clear the in_list bits and empty the build array for VDEFs and
+ VUSEs. */
static inline void
-finalize_ssa_v_must_def_ops (tree stmt)
+cleanup_build_arrays (void)
{
- unsigned new_i;
- struct mustdef_optype_d new_list;
- mustdef_optype_p old_ops, ptr, last;
- tree act;
- unsigned old_base, new_base;
-
- new_list.next = NULL;
- last = &new_list;
-
- old_ops = MUSTDEF_OPS (stmt);
-
- new_i = 0;
- while (old_ops && new_i < VEC_length (tree, build_v_must_defs))
- {
- act = VEC_index (tree, build_v_must_defs, new_i);
- new_base = get_name_decl (act);
- old_base = get_name_decl (MUSTDEF_KILL (old_ops));
-
- if (old_base == new_base)
- {
- /* If variables are the same, reuse this node. */
- MOVE_HEAD_AFTER (old_ops, last);
- set_virtual_use_link (MUSTDEF_KILL_PTR (last), stmt);
- new_i++;
- }
- else if (old_base < new_base)
- {
- /* If old is less than new, old goes to the free list. */
- delink_imm_use (MUSTDEF_KILL_PTR (old_ops));
- MOVE_HEAD_TO_FREELIST (old_ops, mustdef);
- }
- else
- {
- /* This is a new operand. */
- add_mustdef_op (stmt, act, &last);
- new_i++;
- }
- }
-
- /* If there is anything remaining in the build_v_must_defs list, simply emit it. */
- for ( ; new_i < VEC_length (tree, build_v_must_defs); new_i++)
- add_mustdef_op (stmt, VEC_index (tree, build_v_must_defs, new_i), &last);
-
- last->next = NULL;
-
- /* If there is anything in the old list, free it. */
- if (old_ops)
- {
- for (ptr = old_ops; ptr; ptr = ptr->next)
- delink_imm_use (MUSTDEF_KILL_PTR (ptr));
- old_ops->next = gimple_ssa_operands (cfun)->free_mustdefs;
- gimple_ssa_operands (cfun)->free_mustdefs = old_ops;
- }
-
- /* Now set the stmt's operands. */
- MUSTDEF_OPS (stmt) = new_list.next;
-
-#ifdef ENABLE_CHECKING
- {
- unsigned x = 0;
- for (ptr = MUSTDEF_OPS (stmt); ptr; ptr = ptr->next)
- x++;
-
- gcc_assert (x == VEC_length (tree, build_v_must_defs));
- }
-#endif
-}
-
-static void
-finalize_ssa_v_must_defs (tree stmt)
-{
- /* In the presence of subvars, there may be more than one V_MUST_DEF
- per statement (one for each subvar). It is a bit expensive to
- verify that all must-defs in a statement belong to subvars if
- there is more than one must-def, so we don't do it. Suffice to
- say, if you reach here without having subvars, and have num >1,
- you have hit a bug. */
- finalize_ssa_v_must_def_ops (stmt);
- VEC_truncate (tree, build_v_must_defs, 0);
+ build_vdef = NULL_TREE;
+ build_vuse = NULL_TREE;
+ VEC_truncate (tree, build_defs, 0);
+ VEC_truncate (tree, build_uses, 0);
}
/* Finalize all the build vectors, fill the new ones into INFO. */
-
+
static inline void
-finalize_ssa_stmt_operands (tree stmt)
+finalize_ssa_stmt_operands (gimple stmt)
{
finalize_ssa_defs (stmt);
finalize_ssa_uses (stmt);
- finalize_ssa_v_must_defs (stmt);
- finalize_ssa_v_may_defs (stmt);
- finalize_ssa_vuses (stmt);
+ cleanup_build_arrays ();
}
{
gcc_assert (VEC_length (tree, build_defs) == 0);
gcc_assert (VEC_length (tree, build_uses) == 0);
- gcc_assert (VEC_length (tree, build_vuses) == 0);
- gcc_assert (VEC_length (tree, build_v_may_defs) == 0);
- gcc_assert (VEC_length (tree, build_v_must_defs) == 0);
+ gcc_assert (build_vuse == NULL_TREE);
+ gcc_assert (build_vdef == NULL_TREE);
}
static inline void
append_def (tree *def_p)
{
- VEC_safe_push (tree, heap, build_defs, (tree)def_p);
+ VEC_safe_push (tree, heap, build_defs, (tree) def_p);
}
static inline void
append_use (tree *use_p)
{
- VEC_safe_push (tree, heap, build_uses, (tree)use_p);
+ VEC_safe_push (tree, heap, build_uses, (tree) use_p);
}
-/* Add a new virtual may def for variable VAR to the build array. */
+/* Add VAR to the set of variables that require a VDEF operator. */
static inline void
-append_v_may_def (tree var)
+append_vdef (tree var)
{
- if (TREE_CODE (var) != SSA_NAME)
- {
- var_ann_t ann = get_var_ann (var);
-
- /* Don't allow duplicate entries. */
- if (ann->in_v_may_def_list)
- return;
- ann->in_v_may_def_list = 1;
- }
-
- VEC_safe_push (tree, heap, build_v_may_defs, (tree)var);
-}
-
-
-/* Add VAR to the list of virtual uses. */
-
-static inline void
-append_vuse (tree var)
-{
- /* Don't allow duplicate entries. */
- if (TREE_CODE (var) != SSA_NAME)
- {
- var_ann_t ann = get_var_ann (var);
-
- if (ann->in_vuse_list || ann->in_v_may_def_list)
- return;
- ann->in_vuse_list = 1;
- }
-
- VEC_safe_push (tree, heap, build_vuses, (tree)var);
-}
-
-
-/* Add VAR to the list of virtual must definitions for INFO. */
-
-static inline void
-append_v_must_def (tree var)
-{
- unsigned i;
-
- /* Don't allow duplicate entries. */
- for (i = 0; i < VEC_length (tree, build_v_must_defs); i++)
- if (var == VEC_index (tree, build_v_must_defs, i))
- return;
-
- VEC_safe_push (tree, heap, build_v_must_defs, (tree)var);
-}
-
-
-/* REF is a tree that contains the entire pointer dereference
- expression, if available, or NULL otherwise. ALIAS is the variable
- we are asking if REF can access. OFFSET and SIZE come from the
- memory access expression that generated this virtual operand. */
-
-static bool
-access_can_touch_variable (tree ref, tree alias, HOST_WIDE_INT offset,
- HOST_WIDE_INT size)
-{
- bool offsetgtz = offset > 0;
- unsigned HOST_WIDE_INT uoffset = (unsigned HOST_WIDE_INT) offset;
- tree base = ref ? get_base_address (ref) : NULL;
-
- /* If ALIAS is .GLOBAL_VAR then the memory reference REF must be
- using a call-clobbered memory tag. By definition, call-clobbered
- memory tags can always touch .GLOBAL_VAR. */
- if (alias == gimple_global_var (cfun))
- return true;
-
- /* If ALIAS is an SFT, it can't be touched if the offset
- and size of the access is not overlapping with the SFT offset and
- size. This is only true if we are accessing through a pointer
- to a type that is the same as SFT_PARENT_VAR. Otherwise, we may
- be accessing through a pointer to some substruct of the
- structure, and if we try to prune there, we will have the wrong
- offset, and get the wrong answer.
- i.e., we can't prune without more work if we have something like
-
- struct gcc_target
- {
- struct asm_out
- {
- const char *byte_op;
- struct asm_int_op
- {
- const char *hi;
- } aligned_op;
- } asm_out;
- } targetm;
-
- foo = &targetm.asm_out.aligned_op;
- return foo->hi;
-
- SFT.1, which represents hi, will have SFT_OFFSET=32 because in
- terms of SFT_PARENT_VAR, that is where it is.
- However, the access through the foo pointer will be at offset 0. */
- if (size != -1
- && TREE_CODE (alias) == STRUCT_FIELD_TAG
- && base
- && TREE_TYPE (base) == TREE_TYPE (SFT_PARENT_VAR (alias))
- && !overlap_subvar (offset, size, alias, NULL))
- {
-#ifdef ACCESS_DEBUGGING
- fprintf (stderr, "Access to ");
- print_generic_expr (stderr, ref, 0);
- fprintf (stderr, " may not touch ");
- print_generic_expr (stderr, alias, 0);
- fprintf (stderr, " in function %s\n", get_name (current_function_decl));
-#endif
- return false;
- }
-
- /* Without strict aliasing, it is impossible for a component access
- through a pointer to touch a random variable, unless that
- variable *is* a structure or a pointer.
-
- That is, given p->c, and some random global variable b,
- there is no legal way that p->c could be an access to b.
-
- Without strict aliasing on, we consider it legal to do something
- like:
-
- struct foos { int l; };
- int foo;
- static struct foos *getfoo(void);
- int main (void)
- {
- struct foos *f = getfoo();
- f->l = 1;
- foo = 2;
- if (f->l == 1)
- abort();
- exit(0);
- }
- static struct foos *getfoo(void)
- { return (struct foos *)&foo; }
-
- (taken from 20000623-1.c)
-
- The docs also say/imply that access through union pointers
- is legal (but *not* if you take the address of the union member,
- i.e. the inverse), such that you can do
-
- typedef union {
- int d;
- } U;
-
- int rv;
- void breakme()
- {
- U *rv0;
- U *pretmp = (U*)&rv;
- rv0 = pretmp;
- rv0->d = 42;
- }
- To implement this, we just punt on accesses through union
- pointers entirely.
- */
- else if (ref
- && flag_strict_aliasing
- && TREE_CODE (ref) != INDIRECT_REF
- && !MTAG_P (alias)
- && (TREE_CODE (base) != INDIRECT_REF
- || TREE_CODE (TREE_TYPE (base)) != UNION_TYPE)
- && !AGGREGATE_TYPE_P (TREE_TYPE (alias))
- && TREE_CODE (TREE_TYPE (alias)) != COMPLEX_TYPE
- && !var_ann (alias)->is_heapvar
- /* When the struct has may_alias attached to it, we need not to
- return true. */
- && get_alias_set (base))
- {
-#ifdef ACCESS_DEBUGGING
- fprintf (stderr, "Access to ");
- print_generic_expr (stderr, ref, 0);
- fprintf (stderr, " may not touch ");
- print_generic_expr (stderr, alias, 0);
- fprintf (stderr, " in function %s\n", get_name (current_function_decl));
-#endif
- return false;
- }
-
- /* If the offset of the access is greater than the size of one of
- the possible aliases, it can't be touching that alias, because it
- would be past the end of the structure. */
- else if (ref
- && flag_strict_aliasing
- && TREE_CODE (ref) != INDIRECT_REF
- && !MTAG_P (alias)
- && !POINTER_TYPE_P (TREE_TYPE (alias))
- && offsetgtz
- && DECL_SIZE (alias)
- && TREE_CODE (DECL_SIZE (alias)) == INTEGER_CST
- && uoffset > TREE_INT_CST_LOW (DECL_SIZE (alias)))
- {
-#ifdef ACCESS_DEBUGGING
- fprintf (stderr, "Access to ");
- print_generic_expr (stderr, ref, 0);
- fprintf (stderr, " may not touch ");
- print_generic_expr (stderr, alias, 0);
- fprintf (stderr, " in function %s\n", get_name (current_function_decl));
-#endif
- return false;
- }
+ if (!optimize)
+ return;
- return true;
+ gcc_assert ((build_vdef == NULL_TREE
+ || build_vdef == var)
+ && (build_vuse == NULL_TREE
+ || build_vuse == var));
+
+ build_vdef = var;
+ build_vuse = var;
}
-/* Add VAR to the virtual operands array. FLAGS is as in
- get_expr_operands. FULL_REF is a tree that contains the entire
- pointer dereference expression, if available, or NULL otherwise.
- OFFSET and SIZE come from the memory access expression that
- generated this virtual operand. FOR_CLOBBER is true is this is
- adding a virtual operand for a call clobber. */
+/* Add VAR to the set of variables that require a VUSE operator. */
-static void
-add_virtual_operand (tree var, stmt_ann_t s_ann, int flags,
- tree full_ref, HOST_WIDE_INT offset,
- HOST_WIDE_INT size, bool for_clobber)
+static inline void
+append_vuse (tree var)
{
- VEC(tree,gc) *aliases;
- tree sym;
- var_ann_t v_ann;
-
- sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var);
- v_ann = var_ann (sym);
-
- /* Mark statements with volatile operands. Optimizers should back
- off from statements having volatile operands. */
- if (TREE_THIS_VOLATILE (sym) && s_ann)
- s_ann->has_volatile_ops = true;
-
- /* If the variable cannot be modified and this is a V_MAY_DEF change
- it into a VUSE. This happens when read-only variables are marked
- call-clobbered and/or aliased to writable variables. So we only
- check that this only happens on non-specific stores.
-
- Note that if this is a specific store, i.e. associated with a
- gimple_modify_stmt, then we can't suppress the V_MAY_DEF, lest we run
- into validation problems.
-
- This can happen when programs cast away const, leaving us with a
- store to read-only memory. If the statement is actually executed
- at runtime, then the program is ill formed. If the statement is
- not executed then all is well. At the very least, we cannot ICE. */
- if ((flags & opf_non_specific) && unmodifiable_var_p (var))
- flags &= ~(opf_is_def | opf_kill_def);
-
- /* The variable is not a GIMPLE register. Add it (or its aliases) to
- virtual operands, unless the caller has specifically requested
- not to add virtual operands (used when adding operands inside an
+ if (!optimize)
+ return;
+
+ gcc_assert (build_vuse == NULL_TREE
+ || build_vuse == var);
+
+ build_vuse = var;
+}
+
+/* Add virtual operands for STMT. FLAGS is as in get_expr_operands. */
+
+static void
+add_virtual_operand (gimple stmt ATTRIBUTE_UNUSED, int flags)
+{
+ /* Add virtual operands to the stmt, unless the caller has specifically
+ requested not to do that (used when adding operands inside an
ADDR_EXPR expression). */
if (flags & opf_no_vops)
return;
-
- aliases = v_ann->may_aliases;
- if (aliases == NULL)
- {
- /* The variable is not aliased or it is an alias tag. */
- if (flags & opf_is_def)
- {
- if (flags & opf_kill_def)
- {
- /* V_MUST_DEF for non-aliased, non-GIMPLE register
- variable definitions. */
- gcc_assert (!MTAG_P (var)
- || TREE_CODE (var) == STRUCT_FIELD_TAG);
- append_v_must_def (var);
- }
- else
- {
- /* Add a V_MAY_DEF for call-clobbered variables and
- memory tags. */
- append_v_may_def (var);
- }
- }
- else
- append_vuse (var);
- }
+
+ gcc_assert (!is_gimple_debug (stmt));
+
+ if (flags & opf_def)
+ append_vdef (gimple_vop (cfun));
else
- {
- unsigned i;
- tree al;
-
- /* The variable is aliased. Add its aliases to the virtual
- operands. */
- gcc_assert (VEC_length (tree, aliases) != 0);
-
- if (flags & opf_is_def)
- {
-
- bool none_added = true;
-
- for (i = 0; VEC_iterate (tree, aliases, i, al); i++)
- {
- if (!access_can_touch_variable (full_ref, al, offset, size))
- continue;
-
- none_added = false;
- append_v_may_def (al);
- }
-
- /* If the variable is also an alias tag, add a virtual
- operand for it, otherwise we will miss representing
- references to the members of the variable's alias set.
- This fixes the bug in gcc.c-torture/execute/20020503-1.c.
-
- It is also necessary to add bare defs on clobbers for
- SMT's, so that bare SMT uses caused by pruning all the
- aliases will link up properly with calls. In order to
- keep the number of these bare defs we add down to the
- minimum necessary, we keep track of which SMT's were used
- alone in statement vdefs or VUSEs. */
- if (v_ann->is_aliased
- || none_added
- || (TREE_CODE (var) == SYMBOL_MEMORY_TAG
- && for_clobber))
- {
- append_v_may_def (var);
- }
- }
- else
- {
- bool none_added = true;
- for (i = 0; VEC_iterate (tree, aliases, i, al); i++)
- {
- if (!access_can_touch_variable (full_ref, al, offset, size))
- continue;
- none_added = false;
- append_vuse (al);
- }
-
- /* Similarly, append a virtual uses for VAR itself, when
- it is an alias tag. */
- if (v_ann->is_aliased || none_added)
- append_vuse (var);
- }
- }
+ append_vuse (gimple_vop (cfun));
}
-/* Add *VAR_P to the appropriate operand array for S_ANN. FLAGS is as in
- get_expr_operands. If *VAR_P is a GIMPLE register, it will be added to
- the statement's real operands, otherwise it is added to virtual
- operands. */
+/* Add *VAR_P to the appropriate operand array for statement STMT.
+ FLAGS is as in get_expr_operands. If *VAR_P is a GIMPLE register,
+ it will be added to the statement's real operands, otherwise it is
+ added to virtual operands. */
static void
-add_stmt_operand (tree *var_p, stmt_ann_t s_ann, int flags)
+add_stmt_operand (tree *var_p, gimple stmt, int flags)
{
- bool is_real_op;
tree var, sym;
- var_ann_t v_ann;
-
- var = *var_p;
- gcc_assert (SSA_VAR_P (var));
-
- is_real_op = is_gimple_reg (var);
- /* If this is a real operand, the operand is either an SSA name or a
- decl. Virtual operands may only be decls. */
- gcc_assert (is_real_op || DECL_P (var));
+ gcc_assert (SSA_VAR_P (*var_p));
+ var = *var_p;
sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var);
- v_ann = var_ann (sym);
- /* Mark statements with volatile operands. Optimizers should back
- off from statements having volatile operands. */
- if (TREE_THIS_VOLATILE (sym) && s_ann)
- s_ann->has_volatile_ops = true;
+ /* Mark statements with volatile operands. */
+ if (TREE_THIS_VOLATILE (sym))
+ gimple_set_has_volatile_ops (stmt, true);
- if (is_real_op)
+ if (is_gimple_reg (sym))
{
/* The variable is a GIMPLE register. Add it to real operands. */
- if (flags & opf_is_def)
+ if (flags & opf_def)
append_def (var_p);
else
append_use (var_p);
}
else
- add_virtual_operand (var, s_ann, flags, NULL_TREE, 0, -1, false);
+ add_virtual_operand (stmt, flags);
+}
+
+/* Mark the base address of REF as having its address taken.
+ REF may be a single variable whose address has been taken or any
+ other valid GIMPLE memory reference (structure reference, array,
+ etc). */
+
+static void
+mark_address_taken (tree ref)
+{
+ tree var;
+
+ /* Note that it is *NOT OKAY* to use the target of a COMPONENT_REF
+ as the only thing we take the address of. If VAR is a structure,
+ taking the address of a field means that the whole structure may
+ be referenced using pointer arithmetic. See PR 21407 and the
+ ensuing mailing list discussion. */
+ var = get_base_address (ref);
+ if (var && DECL_P (var))
+ TREE_ADDRESSABLE (var) = 1;
}
/* A subroutine of get_expr_operands to handle INDIRECT_REF,
- ALIGN_INDIRECT_REF and MISALIGNED_INDIRECT_REF.
+ ALIGN_INDIRECT_REF and MISALIGNED_INDIRECT_REF.
STMT is the statement being processed, EXPR is the INDIRECT_REF
that got us here.
-
- FLAGS is as in get_expr_operands.
-
- FULL_REF contains the full pointer dereference expression, if we
- have it, or NULL otherwise.
- OFFSET and SIZE are the location of the access inside the
- dereferenced pointer, if known.
+ FLAGS is as in get_expr_operands.
RECURSE_ON_BASE should be set to true if we want to continue
calling get_expr_operands on the base pointer, and false if
something else will do it for us. */
static void
-get_indirect_ref_operands (tree stmt, tree expr, int flags,
- tree full_ref,
- HOST_WIDE_INT offset, HOST_WIDE_INT size,
+get_indirect_ref_operands (gimple stmt, tree expr, int flags,
bool recurse_on_base)
{
tree *pptr = &TREE_OPERAND (expr, 0);
- tree ptr = *pptr;
- stmt_ann_t s_ann = stmt_ann (stmt);
-
- /* Stores into INDIRECT_REF operands are never killing definitions. */
- flags &= ~opf_kill_def;
- if (SSA_VAR_P (ptr))
- {
- struct ptr_info_def *pi = NULL;
+ if (TREE_THIS_VOLATILE (expr))
+ gimple_set_has_volatile_ops (stmt, true);
- /* If PTR has flow-sensitive points-to information, use it. */
- if (TREE_CODE (ptr) == SSA_NAME
- && (pi = SSA_NAME_PTR_INFO (ptr)) != NULL
- && pi->name_mem_tag)
- {
- /* PTR has its own memory tag. Use it. */
- add_virtual_operand (pi->name_mem_tag, s_ann, flags,
- full_ref, offset, size, false);
- }
- else
- {
- /* If PTR is not an SSA_NAME or it doesn't have a name
- tag, use its symbol memory tag. */
- var_ann_t v_ann;
-
- /* If we are emitting debugging dumps, display a warning if
- PTR is an SSA_NAME with no flow-sensitive alias
- information. That means that we may need to compute
- aliasing again. */
- if (dump_file
- && TREE_CODE (ptr) == SSA_NAME
- && pi == NULL)
- {
- fprintf (dump_file,
- "NOTE: no flow-sensitive alias info for ");
- print_generic_expr (dump_file, ptr, dump_flags);
- fprintf (dump_file, " in ");
- print_generic_stmt (dump_file, stmt, dump_flags);
- }
-
- if (TREE_CODE (ptr) == SSA_NAME)
- ptr = SSA_NAME_VAR (ptr);
- v_ann = var_ann (ptr);
-
- if (v_ann->symbol_mem_tag)
- add_virtual_operand (v_ann->symbol_mem_tag, s_ann, flags,
- full_ref, offset, size, false);
- }
- }
- else if (TREE_CODE (ptr) == INTEGER_CST)
- {
- /* If a constant is used as a pointer, we can't generate a real
- operand for it but we mark the statement volatile to prevent
- optimizations from messing things up. */
- if (s_ann)
- s_ann->has_volatile_ops = true;
- return;
- }
- else
- {
- /* Ok, this isn't even is_gimple_min_invariant. Something's broke. */
- gcc_unreachable ();
- }
+ /* Add the VOP. */
+ add_virtual_operand (stmt, flags);
/* If requested, add a USE operand for the base pointer. */
if (recurse_on_base)
- get_expr_operands (stmt, pptr, opf_none);
+ get_expr_operands (stmt, pptr,
+ opf_use | (flags & opf_no_vops));
}
/* A subroutine of get_expr_operands to handle TARGET_MEM_REF. */
static void
-get_tmr_operands (tree stmt, tree expr, int flags)
+get_tmr_operands (gimple stmt, tree expr, int flags)
{
- tree tag = TMR_TAG (expr), ref;
- HOST_WIDE_INT offset, size, maxsize;
- subvar_t svars, sv;
- stmt_ann_t s_ann = stmt_ann (stmt);
+ if (TREE_THIS_VOLATILE (expr))
+ gimple_set_has_volatile_ops (stmt, true);
/* First record the real operands. */
- get_expr_operands (stmt, &TMR_BASE (expr), opf_none);
- get_expr_operands (stmt, &TMR_INDEX (expr), opf_none);
-
- /* MEM_REFs should never be killing. */
- flags &= ~opf_kill_def;
+ get_expr_operands (stmt, &TMR_BASE (expr), opf_use | (flags & opf_no_vops));
+ get_expr_operands (stmt, &TMR_INDEX (expr), opf_use | (flags & opf_no_vops));
if (TMR_SYMBOL (expr))
- {
- stmt_ann_t ann = stmt_ann (stmt);
- add_to_addressable_set (TMR_SYMBOL (expr), &ann->addresses_taken);
- }
+ mark_address_taken (TMR_SYMBOL (expr));
- if (!tag)
- {
- /* Something weird, so ensure that we will be careful. */
- stmt_ann (stmt)->has_volatile_ops = true;
- return;
- }
-
- if (DECL_P (tag))
- {
- get_expr_operands (stmt, &tag, flags);
- return;
- }
-
- ref = get_ref_base_and_extent (tag, &offset, &size, &maxsize);
- gcc_assert (ref != NULL_TREE);
- svars = get_subvars_for_var (ref);
- for (sv = svars; sv; sv = sv->next)
- {
- bool exact;
- if (overlap_subvar (offset, maxsize, sv->var, &exact))
- {
- int subvar_flags = flags;
- if (!exact || size != maxsize)
- subvar_flags &= ~opf_kill_def;
- add_stmt_operand (&sv->var, s_ann, subvar_flags);
- }
- }
-}
-
-
-/* Add clobbering definitions for .GLOBAL_VAR or for each of the call
- clobbered variables in the function. */
-
-static void
-add_call_clobber_ops (tree stmt, tree callee)
-{
- unsigned u;
- bitmap_iterator bi;
- stmt_ann_t s_ann = stmt_ann (stmt);
- bitmap not_read_b, not_written_b;
-
- /* Functions that are not const, pure or never return may clobber
- call-clobbered variables. */
- if (s_ann)
- s_ann->makes_clobbering_call = true;
-
- /* If we created .GLOBAL_VAR earlier, just use it. See compute_may_aliases
- for the heuristic used to decide whether to create .GLOBAL_VAR or not. */
- if (gimple_global_var (cfun))
- {
- tree var = gimple_global_var (cfun);
- add_stmt_operand (&var, s_ann, opf_is_def);
- return;
- }
-
- /* Get info for local and module level statics. There is a bit
- set for each static if the call being processed does not read
- or write that variable. */
- not_read_b = callee ? ipa_reference_get_not_read_global (callee) : NULL;
- not_written_b = callee ? ipa_reference_get_not_written_global (callee) : NULL;
- /* Add a V_MAY_DEF operand for every call clobbered variable. */
- EXECUTE_IF_SET_IN_BITMAP (gimple_call_clobbered_vars (cfun), 0, u, bi)
- {
- tree var = referenced_var_lookup (u);
- unsigned int escape_mask = var_ann (var)->escape_mask;
- tree real_var = var;
- bool not_read;
- bool not_written;
-
- /* Not read and not written are computed on regular vars, not
- subvars, so look at the parent var if this is an SFT. */
- if (TREE_CODE (var) == STRUCT_FIELD_TAG)
- real_var = SFT_PARENT_VAR (var);
-
- not_read = not_read_b ? bitmap_bit_p (not_read_b,
- DECL_UID (real_var)) : false;
- not_written = not_written_b ? bitmap_bit_p (not_written_b,
- DECL_UID (real_var)) : false;
- gcc_assert (!unmodifiable_var_p (var));
-
- clobber_stats.clobbered_vars++;
-
- /* See if this variable is really clobbered by this function. */
-
- /* Trivial case: Things escaping only to pure/const are not
- clobbered by non-pure-const, and only read by pure/const. */
- if ((escape_mask & ~(ESCAPE_TO_PURE_CONST)) == 0)
- {
- tree call = get_call_expr_in (stmt);
- if (call_expr_flags (call) & (ECF_CONST | ECF_PURE))
- {
- add_stmt_operand (&var, s_ann, opf_none);
- clobber_stats.unescapable_clobbers_avoided++;
- continue;
- }
- else
- {
- clobber_stats.unescapable_clobbers_avoided++;
- continue;
- }
- }
-
- if (not_written)
- {
- clobber_stats.static_write_clobbers_avoided++;
- if (!not_read)
- add_stmt_operand (&var, s_ann, opf_none);
- else
- clobber_stats.static_read_clobbers_avoided++;
- }
- else
- add_virtual_operand (var, s_ann, opf_is_def, NULL, 0, -1, true);
- }
-}
-
-
-/* Add VUSE operands for .GLOBAL_VAR or all call clobbered variables in the
- function. */
-
-static void
-add_call_read_ops (tree stmt, tree callee)
-{
- unsigned u;
- bitmap_iterator bi;
- stmt_ann_t s_ann = stmt_ann (stmt);
- bitmap not_read_b;
-
- /* if the function is not pure, it may reference memory. Add
- a VUSE for .GLOBAL_VAR if it has been created. See add_referenced_var
- for the heuristic used to decide whether to create .GLOBAL_VAR. */
- if (gimple_global_var (cfun))
- {
- tree var = gimple_global_var (cfun);
- add_stmt_operand (&var, s_ann, opf_none);
- return;
- }
-
- not_read_b = callee ? ipa_reference_get_not_read_global (callee) : NULL;
-
- /* Add a VUSE for each call-clobbered variable. */
- EXECUTE_IF_SET_IN_BITMAP (gimple_call_clobbered_vars (cfun), 0, u, bi)
- {
- tree var = referenced_var (u);
- tree real_var = var;
- bool not_read;
-
- clobber_stats.readonly_clobbers++;
-
- /* Not read and not written are computed on regular vars, not
- subvars, so look at the parent var if this is an SFT. */
-
- if (TREE_CODE (var) == STRUCT_FIELD_TAG)
- real_var = SFT_PARENT_VAR (var);
-
- not_read = not_read_b ? bitmap_bit_p (not_read_b, DECL_UID (real_var))
- : false;
-
- if (not_read)
- {
- clobber_stats.static_readonly_clobbers_avoided++;
- continue;
- }
-
- add_stmt_operand (&var, s_ann, opf_none | opf_non_specific);
- }
+ add_virtual_operand (stmt, flags);
}
-/* A subroutine of get_expr_operands to handle CALL_EXPR. */
+/* If STMT is a call that may clobber globals and other symbols that
+ escape, add them to the VDEF/VUSE lists for it. */
static void
-get_call_expr_operands (tree stmt, tree expr)
+maybe_add_call_vops (gimple stmt)
{
- tree op;
- int call_flags = call_expr_flags (expr);
+ int call_flags = gimple_call_flags (stmt);
- /* If aliases have been computed already, add V_MAY_DEF or V_USE
+ /* If aliases have been computed already, add VDEF or VUSE
operands for all the symbols that have been found to be
- call-clobbered.
-
- Note that if aliases have not been computed, the global effects
- of calls will not be included in the SSA web. This is fine
- because no optimizer should run before aliases have been
- computed. By not bothering with virtual operands for CALL_EXPRs
- we avoid adding superfluous virtual operands, which can be a
- significant compile time sink (See PR 15855). */
- if (gimple_aliases_computed_p (cfun)
- && !bitmap_empty_p (gimple_call_clobbered_vars (cfun))
- && !(call_flags & ECF_NOVOPS))
+ call-clobbered. */
+ if (!(call_flags & ECF_NOVOPS))
{
- /* A 'pure' or a 'const' function never call-clobbers anything.
- A 'noreturn' function might, but since we don't return anyway
- there is no point in recording that. */
- if (TREE_SIDE_EFFECTS (expr)
- && !(call_flags & (ECF_PURE | ECF_CONST | ECF_NORETURN)))
- add_call_clobber_ops (stmt, get_callee_fndecl (expr));
+ /* A 'pure' or a 'const' function never call-clobbers anything.
+ A 'noreturn' function might, but since we don't return anyway
+ there is no point in recording that. */
+ if (!(call_flags & (ECF_PURE | ECF_CONST | ECF_NORETURN)))
+ add_virtual_operand (stmt, opf_def);
else if (!(call_flags & ECF_CONST))
- add_call_read_ops (stmt, get_callee_fndecl (expr));
+ add_virtual_operand (stmt, opf_use);
}
-
- /* Find uses in the called function. */
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_none);
-
- for (op = TREE_OPERAND (expr, 1); op; op = TREE_CHAIN (op))
- get_expr_operands (stmt, &TREE_VALUE (op), opf_none);
-
- get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none);
}
/* Scan operands in the ASM_EXPR stmt referred to in INFO. */
static void
-get_asm_expr_operands (tree stmt)
+get_asm_expr_operands (gimple stmt)
{
- stmt_ann_t s_ann = stmt_ann (stmt);
- int noutputs = list_length (ASM_OUTPUTS (stmt));
- const char **oconstraints
- = (const char **) alloca ((noutputs) * sizeof (const char *));
- int i;
- tree link;
+ size_t i, noutputs;
+ const char **oconstraints;
const char *constraint;
bool allows_mem, allows_reg, is_inout;
- for (i=0, link = ASM_OUTPUTS (stmt); link; ++i, link = TREE_CHAIN (link))
+ noutputs = gimple_asm_noutputs (stmt);
+ oconstraints = (const char **) alloca ((noutputs) * sizeof (const char *));
+
+ /* Gather all output operands. */
+ for (i = 0; i < gimple_asm_noutputs (stmt); i++)
{
+ tree link = gimple_asm_output_op (stmt, i);
constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
oconstraints[i] = constraint;
parse_output_constraint (&constraint, i, 0, 0, &allows_mem,
/* Memory operands are addressable. Note that STMT needs the
address of this operand. */
if (!allows_reg && allows_mem)
- {
- tree t = get_base_address (TREE_VALUE (link));
- if (t && DECL_P (t) && s_ann)
- add_to_addressable_set (t, &s_ann->addresses_taken);
- }
+ mark_address_taken (TREE_VALUE (link));
- get_expr_operands (stmt, &TREE_VALUE (link), opf_is_def);
+ get_expr_operands (stmt, &TREE_VALUE (link), opf_def);
}
- for (link = ASM_INPUTS (stmt); link; link = TREE_CHAIN (link))
+ /* Gather all input operands. */
+ for (i = 0; i < gimple_asm_ninputs (stmt); i++)
{
+ tree link = gimple_asm_input_op (stmt, i);
constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
- parse_input_constraint (&constraint, 0, 0, noutputs, 0,
- oconstraints, &allows_mem, &allows_reg);
+ 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)
- {
- tree t = get_base_address (TREE_VALUE (link));
- if (t && DECL_P (t) && s_ann)
- add_to_addressable_set (t, &s_ann->addresses_taken);
- }
+ mark_address_taken (TREE_VALUE (link));
get_expr_operands (stmt, &TREE_VALUE (link), 0);
}
-
- /* Clobber memory for asm ("" : : : "memory"); */
- for (link = ASM_CLOBBERS (stmt); link; link = TREE_CHAIN (link))
- if (strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory") == 0)
- {
- unsigned i;
- bitmap_iterator bi;
-
- /* Clobber all call-clobbered variables (or .GLOBAL_VAR if we
- decided to group them). */
- if (gimple_global_var (cfun))
- {
- tree var = gimple_global_var (cfun);
- add_stmt_operand (&var, s_ann, opf_is_def);
- }
- else
- EXECUTE_IF_SET_IN_BITMAP (gimple_call_clobbered_vars (cfun), 0, i, bi)
- {
- tree var = referenced_var (i);
- add_stmt_operand (&var, s_ann, opf_is_def | opf_non_specific);
- }
-
- /* Now clobber all addressables. */
- EXECUTE_IF_SET_IN_BITMAP (gimple_addressable_vars (cfun), 0, i, bi)
- {
- tree var = referenced_var (i);
-
- /* Subvars are explicitly represented in this list, so
- we don't need the original to be added to the clobber
- ops, but the original *will* be in this list because
- we keep the addressability of the original
- variable up-to-date so we don't screw up the rest of
- the backend. */
- if (var_can_have_subvars (var)
- && get_subvars_for_var (var) != NULL)
- continue;
-
- add_stmt_operand (&var, s_ann, opf_is_def | opf_non_specific);
- }
-
- break;
- }
-}
-
-
-/* Scan operands for the assignment expression EXPR in statement STMT. */
-
-static void
-get_modify_stmt_operands (tree stmt, tree expr)
-{
- /* First get operands from the RHS. */
- get_expr_operands (stmt, &GIMPLE_STMT_OPERAND (expr, 1), opf_none);
-
- /* For the LHS, use a regular definition (OPF_IS_DEF) for GIMPLE
- registers. If the LHS is a store to memory, we will either need
- a preserving definition (V_MAY_DEF) or a killing definition
- (V_MUST_DEF).
-
- Preserving definitions are those that modify a part of an
- aggregate object for which no subvars have been computed (or the
- reference does not correspond exactly to one of them). Stores
- through a pointer are also represented with V_MAY_DEF operators.
-
- The determination of whether to use a preserving or a killing
- definition is done while scanning the LHS of the assignment. By
- default, assume that we will emit a V_MUST_DEF. */
- get_expr_operands (stmt, &GIMPLE_STMT_OPERAND (expr, 0),
- opf_is_def|opf_kill_def);
+ /* Clobber all memory and addressable symbols for asm ("" : : : "memory"); */
+ for (i = 0; i < gimple_asm_nclobbers (stmt); i++)
+ {
+ tree link = gimple_asm_clobber_op (stmt, i);
+ if (strcmp (TREE_STRING_POINTER (TREE_VALUE (link)), "memory") == 0)
+ {
+ add_virtual_operand (stmt, opf_def);
+ break;
+ }
+ }
}
interpret the operands found. */
static void
-get_expr_operands (tree stmt, tree *expr_p, int flags)
+get_expr_operands (gimple stmt, tree *expr_p, int flags)
{
enum tree_code code;
- enum tree_code_class class;
+ enum tree_code_class codeclass;
tree expr = *expr_p;
- stmt_ann_t s_ann = stmt_ann (stmt);
+ int uflags = opf_use;
if (expr == NULL)
return;
+ if (is_gimple_debug (stmt))
+ uflags |= (flags & opf_no_vops);
+
code = TREE_CODE (expr);
- class = TREE_CODE_CLASS (code);
+ codeclass = TREE_CODE_CLASS (code);
switch (code)
{
reference to it, but the fact that the statement takes its
address will be of interest to some passes (e.g. alias
resolution). */
- add_to_addressable_set (TREE_OPERAND (expr, 0), &s_ann->addresses_taken);
+ if (!is_gimple_debug (stmt))
+ mark_address_taken (TREE_OPERAND (expr, 0));
/* If the address is invariant, there may be no interesting
variable references inside. */
return;
case SSA_NAME:
- case STRUCT_FIELD_TAG:
- case SYMBOL_MEMORY_TAG:
- case NAME_MEMORY_TAG:
- add_stmt_operand (expr_p, s_ann, flags);
+ add_stmt_operand (expr_p, stmt, flags);
return;
case VAR_DECL:
case PARM_DECL:
case RESULT_DECL:
- {
- subvar_t svars;
-
- /* Add the subvars for a variable, if it has subvars, to DEFS
- or USES. Otherwise, add the variable itself. Whether it
- goes to USES or DEFS depends on the operand flags. */
- if (var_can_have_subvars (expr)
- && (svars = get_subvars_for_var (expr)))
- {
- subvar_t sv;
- for (sv = svars; sv; sv = sv->next)
- add_stmt_operand (&sv->var, s_ann, flags);
- }
- else
- add_stmt_operand (expr_p, s_ann, flags);
+ add_stmt_operand (expr_p, stmt, flags);
+ return;
- return;
- }
+ case DEBUG_EXPR_DECL:
+ gcc_assert (gimple_debug_bind_p (stmt));
+ return;
case MISALIGNED_INDIRECT_REF:
get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags);
case ALIGN_INDIRECT_REF:
case INDIRECT_REF:
- get_indirect_ref_operands (stmt, expr, flags, NULL_TREE, 0, -1, true);
+ get_indirect_ref_operands (stmt, expr, flags, true);
return;
case TARGET_MEM_REF:
case REALPART_EXPR:
case IMAGPART_EXPR:
{
- tree ref;
- HOST_WIDE_INT offset, size, maxsize;
- bool none = true;
-
- /* This component reference becomes an access to all of the
- subvariables it can touch, if we can determine that, but
- *NOT* the real one. If we can't determine which fields we
- could touch, the recursion will eventually get to a
- variable and add *all* of its subvars, or whatever is the
- minimum correct subset. */
- ref = get_ref_base_and_extent (expr, &offset, &size, &maxsize);
- if (SSA_VAR_P (ref) && get_subvars_for_var (ref))
- {
- subvar_t sv;
- subvar_t svars = get_subvars_for_var (ref);
-
- for (sv = svars; sv; sv = sv->next)
- {
- bool exact;
-
- if (overlap_subvar (offset, maxsize, sv->var, &exact))
- {
- int subvar_flags = flags;
- none = false;
- if (!exact || size != maxsize)
- subvar_flags &= ~opf_kill_def;
- add_stmt_operand (&sv->var, s_ann, subvar_flags);
- }
- }
-
- if (!none)
- flags |= opf_no_vops;
- }
- else if (TREE_CODE (ref) == INDIRECT_REF)
- {
- get_indirect_ref_operands (stmt, ref, flags, expr, offset,
- maxsize, false);
- flags |= opf_no_vops;
- }
+ if (TREE_THIS_VOLATILE (expr))
+ gimple_set_has_volatile_ops (stmt, true);
+
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
- /* Even if we found subvars above we need to ensure to see
- immediate uses for d in s.a[d]. In case of s.a having
- a subvar or we would miss it otherwise. */
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0),
- flags & ~opf_kill_def);
-
if (code == COMPONENT_REF)
{
- if (s_ann && TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1)))
- s_ann->has_volatile_ops = true;
- get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none);
+ if (TREE_THIS_VOLATILE (TREE_OPERAND (expr, 1)))
+ gimple_set_has_volatile_ops (stmt, true);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags);
}
else if (code == ARRAY_REF || code == ARRAY_RANGE_REF)
{
- get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none);
- get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none);
- get_expr_operands (stmt, &TREE_OPERAND (expr, 3), opf_none);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 3), uflags);
}
return;
case WITH_SIZE_EXPR:
/* WITH_SIZE_EXPR is a pass-through reference to its first argument,
and an rvalue reference to its second argument. */
- get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags);
get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
return;
- case CALL_EXPR:
- get_call_expr_operands (stmt, expr);
- return;
-
case COND_EXPR:
case VEC_COND_EXPR:
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_none);
- get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none);
- get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none);
- return;
-
- case GIMPLE_MODIFY_STMT:
- get_modify_stmt_operands (stmt, expr);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), uflags);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), uflags);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), uflags);
return;
case CONSTRUCTOR:
for (idx = 0;
VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (expr), idx, ce);
idx++)
- get_expr_operands (stmt, &ce->value, opf_none);
+ get_expr_operands (stmt, &ce->value, uflags);
return;
}
case BIT_FIELD_REF:
- /* Stores using BIT_FIELD_REF are always preserving definitions. */
- flags &= ~opf_kill_def;
-
- /* Fallthru */
+ if (TREE_THIS_VOLATILE (expr))
+ gimple_set_has_volatile_ops (stmt, true);
+ /* FALLTHRU */
case TRUTH_NOT_EXPR:
case VIEW_CONVERT_EXPR:
return;
}
- case BLOCK:
case FUNCTION_DECL:
- case EXC_PTR_EXPR:
- case FILTER_EXPR:
case LABEL_DECL:
case CONST_DECL:
- case OMP_PARALLEL:
- case OMP_SECTIONS:
- case OMP_FOR:
- case OMP_SINGLE:
- case OMP_MASTER:
- case OMP_ORDERED:
- case OMP_CRITICAL:
- case OMP_RETURN:
- case OMP_CONTINUE:
+ case CASE_LABEL_EXPR:
/* Expressions that make no memory references. */
return;
default:
- if (class == tcc_unary)
+ if (codeclass == tcc_unary)
goto do_unary;
- if (class == tcc_binary || class == tcc_comparison)
+ if (codeclass == tcc_binary || codeclass == tcc_comparison)
goto do_binary;
- if (class == tcc_constant || class == tcc_type)
+ if (codeclass == tcc_constant || codeclass == tcc_type)
return;
}
build_* operand vectors will have potential operands in them. */
static void
-parse_ssa_operands (tree stmt)
+parse_ssa_operands (gimple stmt)
{
- enum tree_code code;
+ enum gimple_code code = gimple_code (stmt);
- code = TREE_CODE (stmt);
- switch (code)
+ if (code == GIMPLE_ASM)
+ get_asm_expr_operands (stmt);
+ else if (is_gimple_debug (stmt))
{
- case GIMPLE_MODIFY_STMT:
- get_modify_stmt_operands (stmt, stmt);
- break;
-
- case COND_EXPR:
- get_expr_operands (stmt, &COND_EXPR_COND (stmt), opf_none);
- break;
-
- case SWITCH_EXPR:
- get_expr_operands (stmt, &SWITCH_COND (stmt), opf_none);
- break;
-
- case ASM_EXPR:
- get_asm_expr_operands (stmt);
- break;
-
- case RETURN_EXPR:
- get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), opf_none);
- break;
-
- case GOTO_EXPR:
- get_expr_operands (stmt, &GOTO_DESTINATION (stmt), opf_none);
- break;
+ if (gimple_debug_bind_p (stmt)
+ && gimple_debug_bind_has_value_p (stmt))
+ get_expr_operands (stmt, gimple_debug_bind_get_value_ptr (stmt),
+ opf_use | opf_no_vops);
+ }
+ else
+ {
+ size_t i, start = 0;
- case LABEL_EXPR:
- get_expr_operands (stmt, &LABEL_EXPR_LABEL (stmt), opf_none);
- break;
+ if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL)
+ {
+ get_expr_operands (stmt, gimple_op_ptr (stmt, 0), opf_def);
+ start = 1;
+ }
- case BIND_EXPR:
- case CASE_LABEL_EXPR:
- case TRY_CATCH_EXPR:
- case TRY_FINALLY_EXPR:
- case EH_FILTER_EXPR:
- case CATCH_EXPR:
- case RESX_EXPR:
- /* These nodes contain no variable references. */
- break;
+ for (i = start; i < gimple_num_ops (stmt); i++)
+ get_expr_operands (stmt, gimple_op_ptr (stmt, i), opf_use);
- default:
- /* Notice that if get_expr_operands tries to use &STMT as the
- operand pointer (which may only happen for USE operands), we
- will fail in add_stmt_operand. This default will handle
- statements like empty statements, or CALL_EXPRs that may
- appear on the RHS of a statement or as statements themselves. */
- get_expr_operands (stmt, &stmt, opf_none);
- break;
+ /* Add call-clobbered operands, if needed. */
+ if (code == GIMPLE_CALL)
+ maybe_add_call_vops (stmt);
}
}
/* Create an operands cache for STMT. */
static void
-build_ssa_operands (tree stmt)
+build_ssa_operands (gimple stmt)
{
- stmt_ann_t ann = get_stmt_ann (stmt);
-
/* Initially assume that the statement has no volatile operands. */
- if (ann)
- ann->has_volatile_ops = false;
+ gimple_set_has_volatile_ops (stmt, false);
start_ssa_stmt_operands ();
-
parse_ssa_operands (stmt);
- operand_build_sort_virtual (build_vuses);
- operand_build_sort_virtual (build_v_may_defs);
- operand_build_sort_virtual (build_v_must_defs);
-
finalize_ssa_stmt_operands (stmt);
}
-/* Free any operands vectors in OPS. */
-
-void
-free_ssa_operands (stmt_operands_p ops)
-{
- ops->def_ops = NULL;
- ops->use_ops = NULL;
- ops->maydef_ops = NULL;
- ops->mustdef_ops = NULL;
- ops->vuse_ops = NULL;
-}
-
-
-/* Get the operands of statement STMT. */
-
-void
-update_stmt_operands (tree stmt)
-{
- stmt_ann_t ann = get_stmt_ann (stmt);
-
- /* If update_stmt_operands is called before SSA is initialized, do
- nothing. */
- if (!ssa_operands_active ())
- return;
-
- /* The optimizers cannot handle statements that are nothing but a
- _DECL. This indicates a bug in the gimplifier. */
- gcc_assert (!SSA_VAR_P (stmt));
-
- gcc_assert (ann->modified);
-
- timevar_push (TV_TREE_OPS);
-
- build_ssa_operands (stmt);
-
- /* Clear the modified bit for STMT. */
- ann->modified = 0;
-
- timevar_pop (TV_TREE_OPS);
-}
-
-
-/* Copies virtual operands from SRC to DST. */
+/* Releases the operands of STMT back to their freelists, and clears
+ the stmt operand lists. */
void
-copy_virtual_operands (tree dest, tree src)
+free_stmt_operands (gimple stmt)
{
- tree t;
- ssa_op_iter iter, old_iter;
- use_operand_p use_p, u2;
- def_operand_p def_p, d2;
-
- build_ssa_operands (dest);
-
- /* Copy all the virtual fields. */
- FOR_EACH_SSA_TREE_OPERAND (t, src, iter, SSA_OP_VUSE)
- append_vuse (t);
- FOR_EACH_SSA_TREE_OPERAND (t, src, iter, SSA_OP_VMAYDEF)
- append_v_may_def (t);
- FOR_EACH_SSA_TREE_OPERAND (t, src, iter, SSA_OP_VMUSTDEF)
- append_v_must_def (t);
-
- if (VEC_length (tree, build_vuses) == 0
- && VEC_length (tree, build_v_may_defs) == 0
- && VEC_length (tree, build_v_must_defs) == 0)
- return;
-
- /* Now commit the virtual operands to this stmt. */
- finalize_ssa_v_must_defs (dest);
- finalize_ssa_v_may_defs (dest);
- finalize_ssa_vuses (dest);
+ def_optype_p defs = gimple_def_ops (stmt), last_def;
+ use_optype_p uses = gimple_use_ops (stmt), last_use;
- /* Finally, set the field to the same values as then originals. */
- t = op_iter_init_tree (&old_iter, src, SSA_OP_VUSE);
- FOR_EACH_SSA_USE_OPERAND (use_p, dest, iter, SSA_OP_VUSE)
+ if (defs)
{
- gcc_assert (!op_iter_done (&old_iter));
- SET_USE (use_p, t);
- t = op_iter_next_tree (&old_iter);
+ for (last_def = defs; last_def->next; last_def = last_def->next)
+ continue;
+ last_def->next = gimple_ssa_operands (cfun)->free_defs;
+ gimple_ssa_operands (cfun)->free_defs = defs;
+ gimple_set_def_ops (stmt, NULL);
}
- gcc_assert (op_iter_done (&old_iter));
- op_iter_init_maydef (&old_iter, src, &u2, &d2);
- FOR_EACH_SSA_MAYDEF_OPERAND (def_p, use_p, dest, iter)
+ if (uses)
{
- gcc_assert (!op_iter_done (&old_iter));
- SET_USE (use_p, USE_FROM_PTR (u2));
- SET_DEF (def_p, DEF_FROM_PTR (d2));
- op_iter_next_maymustdef (&u2, &d2, &old_iter);
+ for (last_use = uses; last_use->next; last_use = last_use->next)
+ delink_imm_use (USE_OP_PTR (last_use));
+ delink_imm_use (USE_OP_PTR (last_use));
+ last_use->next = gimple_ssa_operands (cfun)->free_uses;
+ gimple_ssa_operands (cfun)->free_uses = uses;
+ gimple_set_use_ops (stmt, NULL);
}
- gcc_assert (op_iter_done (&old_iter));
- op_iter_init_mustdef (&old_iter, src, &u2, &d2);
- FOR_EACH_SSA_MUSTDEF_OPERAND (def_p, use_p, dest, iter)
+ if (gimple_has_mem_ops (stmt))
{
- gcc_assert (!op_iter_done (&old_iter));
- SET_USE (use_p, USE_FROM_PTR (u2));
- SET_DEF (def_p, DEF_FROM_PTR (d2));
- op_iter_next_maymustdef (&u2, &d2, &old_iter);
+ gimple_set_vuse (stmt, NULL_TREE);
+ gimple_set_vdef (stmt, NULL_TREE);
}
- gcc_assert (op_iter_done (&old_iter));
-
}
-/* Specifically for use in DOM's expression analysis. Given a store, we
- create an artificial stmt which looks like a load from the store, this can
- be used to eliminate redundant loads. OLD_OPS are the operands from the
- store stmt, and NEW_STMT is the new load which represents a load of the
- values stored. */
+/* Get the operands of statement STMT. */
void
-create_ssa_artficial_load_stmt (tree new_stmt, tree old_stmt)
+update_stmt_operands (gimple stmt)
{
- stmt_ann_t ann;
- tree op;
- ssa_op_iter iter;
- use_operand_p use_p;
- unsigned x;
-
- ann = get_stmt_ann (new_stmt);
+ /* If update_stmt_operands is called before SSA is initialized, do
+ nothing. */
+ if (!ssa_operands_active ())
+ return;
- /* Process the stmt looking for operands. */
- start_ssa_stmt_operands ();
- parse_ssa_operands (new_stmt);
+ timevar_push (TV_TREE_OPS);
- for (x = 0; x < VEC_length (tree, build_vuses); x++)
- {
- tree t = VEC_index (tree, build_vuses, x);
- if (TREE_CODE (t) != SSA_NAME)
- {
- var_ann_t ann = var_ann (t);
- ann->in_vuse_list = 0;
- }
- }
-
- for (x = 0; x < VEC_length (tree, build_v_may_defs); x++)
- {
- tree t = VEC_index (tree, build_v_may_defs, x);
- if (TREE_CODE (t) != SSA_NAME)
- {
- var_ann_t ann = var_ann (t);
- ann->in_v_may_def_list = 0;
- }
- }
+ gcc_assert (gimple_modified_p (stmt));
+ build_ssa_operands (stmt);
+ gimple_set_modified (stmt, false);
- /* Remove any virtual operands that were found. */
- VEC_truncate (tree, build_v_may_defs, 0);
- VEC_truncate (tree, build_v_must_defs, 0);
- VEC_truncate (tree, build_vuses, 0);
-
- /* For each VDEF on the original statement, we want to create a
- VUSE of the V_MAY_DEF result or V_MUST_DEF op on the new
- statement. */
- FOR_EACH_SSA_TREE_OPERAND (op, old_stmt, iter,
- (SSA_OP_VMAYDEF | SSA_OP_VMUSTDEF))
- append_vuse (op);
-
- /* Now build the operands for this new stmt. */
- finalize_ssa_stmt_operands (new_stmt);
-
- /* All uses in this fake stmt must not be in the immediate use lists. */
- FOR_EACH_SSA_USE_OPERAND (use_p, new_stmt, iter, SSA_OP_ALL_USES)
- delink_imm_use (use_p);
+ timevar_pop (TV_TREE_OPS);
}
to test the validity of the swap operation. */
void
-swap_tree_operands (tree stmt, tree *exp0, tree *exp1)
+swap_tree_operands (gimple stmt, tree *exp0, tree *exp1)
{
tree op0, op1;
op0 = *exp0;
use0 = use1 = NULL;
/* Find the 2 operands in the cache, if they are there. */
- for (ptr = USE_OPS (stmt); ptr; ptr = ptr->next)
+ for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next)
if (USE_OP_PTR (ptr)->use == exp0)
{
use0 = ptr;
break;
}
- for (ptr = USE_OPS (stmt); ptr; ptr = ptr->next)
+ for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next)
if (USE_OP_PTR (ptr)->use == exp1)
{
use1 = ptr;
}
-/* Add the base address of REF to the set *ADDRESSES_TAKEN. If
- *ADDRESSES_TAKEN is NULL, a new set is created. REF may be
- a single variable whose address has been taken or any other valid
- GIMPLE memory reference (structure reference, array, etc). If the
- base address of REF is a decl that has sub-variables, also add all
- of its sub-variables. */
-
-void
-add_to_addressable_set (tree ref, bitmap *addresses_taken)
-{
- tree var;
- subvar_t svars;
-
- gcc_assert (addresses_taken);
-
- /* Note that it is *NOT OKAY* to use the target of a COMPONENT_REF
- as the only thing we take the address of. If VAR is a structure,
- taking the address of a field means that the whole structure may
- be referenced using pointer arithmetic. See PR 21407 and the
- ensuing mailing list discussion. */
- var = get_base_address (ref);
- if (var && SSA_VAR_P (var))
- {
- if (*addresses_taken == NULL)
- *addresses_taken = BITMAP_GGC_ALLOC ();
-
- if (var_can_have_subvars (var)
- && (svars = get_subvars_for_var (var)))
- {
- subvar_t sv;
- for (sv = svars; sv; sv = sv->next)
- {
- bitmap_set_bit (*addresses_taken, DECL_UID (sv->var));
- TREE_ADDRESSABLE (sv->var) = 1;
- }
- }
- else
- {
- bitmap_set_bit (*addresses_taken, DECL_UID (var));
- TREE_ADDRESSABLE (var) = 1;
- }
- }
-}
-
-
/* Scan the immediate_use list for VAR making sure its linked properly.
Return TRUE if there is a problem and emit an error message to F. */
{
if (prev != ptr->prev)
goto error;
-
+
if (ptr->use == NULL)
goto error; /* 2 roots, or SAFE guard node. */
else if (*(ptr->use) != var)
return false;
error:
- if (ptr->stmt && stmt_modified_p (ptr->stmt))
+ if (ptr->loc.stmt && gimple_modified_p (ptr->loc.stmt))
{
- fprintf (f, " STMT MODIFIED. - <%p> ", (void *)ptr->stmt);
- print_generic_stmt (f, ptr->stmt, TDF_SLIM);
+ fprintf (f, " STMT MODIFIED. - <%p> ", (void *)ptr->loc.stmt);
+ print_gimple_stmt (f, ptr->loc.stmt, 0, TDF_SLIM);
}
- fprintf (f, " IMM ERROR : (use_p : tree - %p:%p)", (void *)ptr,
+ fprintf (f, " IMM ERROR : (use_p : tree - %p:%p)", (void *)ptr,
(void *)ptr->use);
print_generic_expr (f, USE_FROM_PTR (ptr), TDF_SLIM);
fprintf(f, "\n");
FOR_EACH_IMM_USE_FAST (use_p, iter, var)
{
- if (use_p->stmt == NULL && use_p->use == NULL)
+ if (use_p->loc.stmt == NULL && use_p->use == NULL)
fprintf (file, "***end of stmt iterator marker***\n");
else
if (!is_gimple_reg (USE_FROM_PTR (use_p)))
- print_generic_stmt (file, USE_STMT (use_p), TDF_VOPS);
+ print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_VOPS|TDF_MEMSYMS);
else
- print_generic_stmt (file, USE_STMT (use_p), TDF_SLIM);
+ print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_SLIM);
}
fprintf(file, "\n");
}
{
dump_immediate_uses_for (stderr, var);
}
+
+
+/* Unlink STMTs virtual definition from the IL by propagating its use. */
+
+void
+unlink_stmt_vdef (gimple stmt)
+{
+ use_operand_p use_p;
+ imm_use_iterator iter;
+ gimple use_stmt;
+ tree vdef = gimple_vdef (stmt);
+
+ if (!vdef
+ || TREE_CODE (vdef) != SSA_NAME)
+ return;
+
+ FOR_EACH_IMM_USE_STMT (use_stmt, iter, gimple_vdef (stmt))
+ {
+ FOR_EACH_IMM_USE_ON_STMT (use_p, iter)
+ SET_USE (use_p, gimple_vuse (stmt));
+ }
+
+ if (SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_vdef (stmt)))
+ SSA_NAME_OCCURS_IN_ABNORMAL_PHI (gimple_vuse (stmt)) = 1;
+}
+
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