/* SSA operands management for trees.
- Copyright (C) 2003, 2004, 2005 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, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, 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 "errors.h"
+#include "tree-pretty-print.h"
+#include "gimple-pretty-print.h"
#include "tree-flow.h"
#include "tree-inline.h"
#include "tree-pass.h"
#include "ggc.h"
#include "timevar.h"
-
+#include "toplev.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
- call-clobbered variable */
-#define opf_is_def (1 << 0)
-
-/* Operand is the target of an assignment expression. */
-#define opf_kill_def (1 << 1)
+/* Operand is the target of an assignment expression or a
+ call-clobbered variable. */
+#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)
-/* This structure maintain a sorted list of operands which is created by
- parse_ssa_operand. */
-struct opbuild_list_d GTY (())
-{
- varray_type vars; /* The VAR_DECLS tree. */
- varray_type uid; /* The sort value for virtaul symbols. */
- varray_type next; /* The next index in the sorted list. */
- int first; /* First element in list. */
- unsigned num; /* Number of elements. */
-};
-
-#define OPBUILD_LAST -1
-
+/* 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 GTY (()) struct opbuild_list_d build_defs;
+static VEC(tree,heap) *build_defs;
/* Array for building all the use operands. */
-static GTY (()) struct opbuild_list_d build_uses;
-
-/* Array for building all the v_may_def operands. */
-static GTY (()) struct opbuild_list_d build_v_may_defs;
-
-/* Array for building all the vuse operands. */
-static GTY (()) struct opbuild_list_d build_vuses;
-
-/* Array for building all the v_must_def operands. */
-static GTY (()) struct opbuild_list_d build_v_must_defs;
-
-/* True if the operands for call clobbered vars are cached and valid. */
-bool ssa_call_clobbered_cache_valid;
-bool ssa_ro_call_cache_valid;
-
-/* These arrays are the cached operand vectors for call clobbered calls. */
-static GTY (()) varray_type clobbered_v_may_defs;
-static GTY (()) varray_type clobbered_vuses;
-static GTY (()) varray_type ro_call_vuses;
-static bool clobbered_aliased_loads;
-static bool clobbered_aliased_stores;
-static bool ro_call_aliased_loads;
-static bool ops_active = false;
-
-static GTY (()) struct ssa_operand_memory_d *operand_memory = NULL;
-static unsigned operand_memory_index;
-
-static void note_addressable (tree, stmt_ann_t);
-static void get_expr_operands (tree, tree *, int);
-static void get_asm_expr_operands (tree);
-static void get_indirect_ref_operands (tree, tree, int);
-static void get_call_expr_operands (tree, tree);
-static inline void append_def (tree *);
-static inline void append_use (tree *);
-static void append_v_may_def (tree);
-static void append_v_must_def (tree);
-static void add_call_clobber_ops (tree);
-static void add_call_read_ops (tree);
-static void add_stmt_operand (tree *, stmt_ann_t, int);
-static void build_ssa_operands (tree stmt);
-
-static def_optype_p free_defs = NULL;
-static use_optype_p free_uses = NULL;
-static vuse_optype_p free_vuses = NULL;
-static maydef_optype_p free_maydefs = NULL;
-static mustdef_optype_p free_mustdefs = NULL;
-
-/* Initialize a virtual operand build LIST called NAME with NUM elements. */
+static VEC(tree,heap) *build_uses;
-static inline void
-opbuild_initialize_virtual (struct opbuild_list_d *list, int num,
- const char *name)
-{
- list->first = OPBUILD_LAST;
- list->num = 0;
- VARRAY_TREE_INIT (list->vars, num, name);
- VARRAY_UINT_INIT (list->uid, num, "List UID");
- VARRAY_INT_INIT (list->next, num, "List NEXT");
-}
+/* The built VDEF operand. */
+static tree build_vdef;
+/* The built VUSE operand. */
+static tree build_vuse;
-/* Initialize a real operand build LIST called NAME with NUM elements. */
+/* Bitmap obstack for our datastructures that needs to survive across
+ compilations of multiple functions. */
+static bitmap_obstack operands_bitmap_obstack;
-static inline void
-opbuild_initialize_real (struct opbuild_list_d *list, int num, const char *name)
+static void get_expr_operands (gimple, tree *, int);
+
+/* Number of functions with initialized ssa_operands. */
+static int n_initialized = 0;
+
+/* Return the DECL_UID of the base variable of T. */
+
+static inline unsigned
+get_name_decl (const_tree t)
{
- list->first = OPBUILD_LAST;
- list->num = 0;
- VARRAY_TREE_PTR_INIT (list->vars, num, name);
- VARRAY_INT_INIT (list->next, num, "List NEXT");
- /* The UID field is not needed since we sort based on the pointer value. */
- list->uid = NULL;
+ if (TREE_CODE (t) != SSA_NAME)
+ return DECL_UID (t);
+ else
+ return DECL_UID (SSA_NAME_VAR (t));
}
-/* Free memory used in virtual operand build object LIST. */
+/* Return true if the SSA operands cache is active. */
-static inline void
-opbuild_free (struct opbuild_list_d *list)
+bool
+ssa_operands_active (void)
{
- list->vars = NULL;
- list->uid = NULL;
- list->next = NULL;
+ /* 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;
}
-/* Number of elements in an opbuild list. */
+/* Create the VOP variable, an artificial global variable to act as a
+ representative of all of the virtual operands FUD chain. */
-static inline unsigned
-opbuild_num_elems (struct opbuild_list_d *list)
+static void
+create_vop_var (void)
{
- return list->num;
+ 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;
}
+/* 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. */
-/* Add VAR to the real operand list LIST, keeping it sorted and avoiding
- duplicates. The actual sort value is the tree pointer value. */
+#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 *))
-static inline void
-opbuild_append_real (struct opbuild_list_d *list, tree *var)
-{
- int index;
+/* Initialize the operand cache routines. */
-#ifdef ENABLE_CHECKING
- /* Ensure the real operand doesn't exist already. */
- for (index = list->first;
- index != OPBUILD_LAST;
- index = VARRAY_INT (list->next, index))
- gcc_assert (VARRAY_TREE_PTR (list->vars, index) != var);
-#endif
+void
+init_ssa_operands (void)
+{
+ if (!n_initialized++)
+ {
+ build_defs = VEC_alloc (tree, heap, 5);
+ build_uses = VEC_alloc (tree, heap, 10);
+ build_vuse = NULL_TREE;
+ build_vdef = NULL_TREE;
+ bitmap_obstack_initialize (&operands_bitmap_obstack);
+ }
- /* First item in the list. */
- index = VARRAY_ACTIVE_SIZE (list->vars);
- if (index == 0)
- list->first = index;
- else
- VARRAY_INT (list->next, index - 1) = index;
- VARRAY_PUSH_INT (list->next, OPBUILD_LAST);
- VARRAY_PUSH_TREE_PTR (list->vars, var);
- list->num++;
+ gcc_assert (gimple_ssa_operands (cfun)->operand_memory == NULL);
+ 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 ();
}
-/* Add VAR to the virtual operand list LIST, keeping it sorted and avoiding
- duplicates. The actual sort value is the DECL UID of the base variable. */
+/* Dispose of anything required by the operand routines. */
-static inline void
-opbuild_append_virtual (struct opbuild_list_d *list, tree var)
+void
+fini_ssa_operands (void)
{
- int index, curr, last;
- unsigned int var_uid;
-
- if (TREE_CODE (var) != SSA_NAME)
- var_uid = DECL_UID (var);
- else
- var_uid = DECL_UID (SSA_NAME_VAR (var));
-
- index = VARRAY_ACTIVE_SIZE (list->vars);
+ struct ssa_operand_memory_d *ptr;
- if (index == 0)
+ if (!--n_initialized)
{
- VARRAY_PUSH_TREE (list->vars, var);
- VARRAY_PUSH_UINT (list->uid, var_uid);
- VARRAY_PUSH_INT (list->next, OPBUILD_LAST);
- list->first = 0;
- list->num = 1;
- return;
+ VEC_free (tree, heap, build_defs);
+ VEC_free (tree, heap, build_uses);
+ build_vdef = NULL_TREE;
+ build_vuse = NULL_TREE;
}
- last = OPBUILD_LAST;
- /* Find the correct spot in the sorted list. */
- for (curr = list->first;
- curr != OPBUILD_LAST;
- last = curr, curr = VARRAY_INT (list->next, curr))
- {
- if (VARRAY_UINT (list->uid, curr) > var_uid)
- break;
- }
+ gimple_ssa_operands (cfun)->free_defs = NULL;
+ gimple_ssa_operands (cfun)->free_uses = NULL;
- if (last == OPBUILD_LAST)
- {
- /* First item in the list. */
- VARRAY_PUSH_INT (list->next, list->first);
- list->first = index;
- }
- else
+ while ((ptr = gimple_ssa_operands (cfun)->operand_memory) != NULL)
{
- /* Dont enter duplicates at all. */
- if (VARRAY_UINT (list->uid, last) == var_uid)
- return;
-
- VARRAY_PUSH_INT (list->next, VARRAY_INT (list->next, last));
- VARRAY_INT (list->next, last) = index;
+ gimple_ssa_operands (cfun)->operand_memory
+ = gimple_ssa_operands (cfun)->operand_memory->next;
+ ggc_free (ptr);
}
- VARRAY_PUSH_TREE (list->vars, var);
- VARRAY_PUSH_UINT (list->uid, var_uid);
- list->num++;
-}
+ gimple_ssa_operands (cfun)->ops_active = false;
-/* Return the first element index in LIST. OPBUILD_LAST means there are no
- more elements. */
-
-static inline int
-opbuild_first (struct opbuild_list_d *list)
-{
- if (list->num > 0)
- return list->first;
- else
- return OPBUILD_LAST;
-}
-
+ if (!n_initialized)
+ bitmap_obstack_release (&operands_bitmap_obstack);
-/* Return the next element after PREV in LIST. */
+ cfun->gimple_df->vop = NULL_TREE;
-static inline int
-opbuild_next (struct opbuild_list_d *list, int prev)
-{
- return VARRAY_INT (list->next, prev);
+ if (dump_file && (dump_flags & TDF_STATS))
+ {
+ fprintf (dump_file, "Original clobbered vars: %d\n",
+ clobber_stats.clobbered_vars);
+ fprintf (dump_file, "Static write clobbers avoided: %d\n",
+ clobber_stats.static_write_clobbers_avoided);
+ fprintf (dump_file, "Static read clobbers avoided: %d\n",
+ clobber_stats.static_read_clobbers_avoided);
+ fprintf (dump_file, "Unescapable clobbers avoided: %d\n",
+ clobber_stats.unescapable_clobbers_avoided);
+ fprintf (dump_file, "Original read-only clobbers: %d\n",
+ clobber_stats.readonly_clobbers);
+ fprintf (dump_file, "Static read-only clobbers avoided: %d\n",
+ clobber_stats.static_readonly_clobbers_avoided);
+ }
}
-/* Return the real element at index ELEM in LIST. */
+/* Return memory for an operand of size SIZE. */
-static inline tree *
-opbuild_elem_real (struct opbuild_list_d *list, int elem)
+static inline void *
+ssa_operand_alloc (unsigned size)
{
- return VARRAY_TREE_PTR (list->vars, elem);
-}
+ char *ptr;
+ gcc_assert (size == sizeof (struct use_optype_d)
+ || size == sizeof (struct def_optype_d));
-/* Return the virtual element at index ELEM in LIST. */
+ if (gimple_ssa_operands (cfun)->operand_memory_index + size
+ >= gimple_ssa_operands (cfun)->ssa_operand_mem_size)
+ {
+ struct ssa_operand_memory_d *ptr;
-static inline tree
-opbuild_elem_virtual (struct opbuild_list_d *list, int elem)
-{
- return VARRAY_TREE (list->vars, elem);
-}
+ 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;
+ }
-/* Return the virtual element uid at index ELEM in LIST. */
-static inline unsigned int
-opbuild_elem_uid (struct opbuild_list_d *list, int elem)
-{
- return VARRAY_UINT (list->uid, elem);
+ ptr = &(gimple_ssa_operands (cfun)->operand_memory
+ ->mem[gimple_ssa_operands (cfun)->operand_memory_index]);
+ gimple_ssa_operands (cfun)->operand_memory_index += size;
+ return ptr;
}
-/* Reset an operand build list. */
+/* Allocate a DEF operand. */
-static inline void
-opbuild_clear (struct opbuild_list_d *list)
+static inline struct def_optype_d *
+alloc_def (void)
{
- list->first = OPBUILD_LAST;
- VARRAY_POP_ALL (list->vars);
- VARRAY_POP_ALL (list->next);
- if (list->uid)
- VARRAY_POP_ALL (list->uid);
- list->num = 0;
+ 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;
}
-/* Remove ELEM from LIST where PREV is the rpevious element. Return the next
- element. */
+/* Allocate a USE operand. */
-static inline int
-opbuild_remove_elem (struct opbuild_list_d *list, int elem, int prev)
+static inline struct use_optype_d *
+alloc_use (void)
{
- int ret;
- if (prev != OPBUILD_LAST)
+ struct use_optype_d *ret;
+ if (gimple_ssa_operands (cfun)->free_uses)
{
- gcc_assert (VARRAY_INT (list->next, prev) == elem);
- ret = VARRAY_INT (list->next, prev) = VARRAY_INT (list->next, elem);
+ ret = gimple_ssa_operands (cfun)->free_uses;
+ gimple_ssa_operands (cfun)->free_uses
+ = gimple_ssa_operands (cfun)->free_uses->next;
}
else
- {
- gcc_assert (list->first == elem);
- ret = list->first = VARRAY_INT (list->next, elem);
- }
- list->num--;
+ ret = (struct use_optype_d *)
+ ssa_operand_alloc (sizeof (struct use_optype_d));
return ret;
}
-/* Return true if the ssa operands cache is active. */
+/* Adds OP to the list of defs after LAST. */
-bool
-ssa_operands_active (void)
+static inline def_optype_p
+add_def_op (tree *op, def_optype_p last)
{
- return ops_active;
+ def_optype_p new_def;
+
+ new_def = alloc_def ();
+ DEF_OP_PTR (new_def) = op;
+ last->next = new_def;
+ new_def->next = NULL;
+ return new_def;
}
-/* Initialize the operand cache routines. */
+/* Adds OP to the list of uses of statement STMT after LAST. */
-void
-init_ssa_operands (void)
+static inline use_optype_p
+add_use_op (gimple stmt, tree *op, use_optype_p last)
{
- opbuild_initialize_real (&build_defs, 5, "build defs");
- opbuild_initialize_real (&build_uses, 10, "build uses");
- opbuild_initialize_virtual (&build_vuses, 25, "build_vuses");
- opbuild_initialize_virtual (&build_v_may_defs, 25, "build_v_may_defs");
- opbuild_initialize_virtual (&build_v_must_defs, 25, "build_v_must_defs");
- gcc_assert (operand_memory == NULL);
- operand_memory_index = SSA_OPERAND_MEMORY_SIZE;
- ops_active = true;
+ 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;
}
-/* Dispose of anything required by the operand routines. */
-void
-fini_ssa_operands (void)
-{
- struct ssa_operand_memory_d *ptr;
- opbuild_free (&build_defs);
- opbuild_free (&build_uses);
- opbuild_free (&build_v_must_defs);
- opbuild_free (&build_v_may_defs);
- opbuild_free (&build_vuses);
- free_defs = NULL;
- free_uses = NULL;
- free_vuses = NULL;
- free_maydefs = NULL;
- free_mustdefs = NULL;
- while ((ptr = operand_memory) != NULL)
- {
- operand_memory = operand_memory->next;
- ggc_free (ptr);
- }
+/* Takes elements from build_defs and turns them into def operands of STMT.
+ TODO -- Make build_defs VEC of tree *. */
- if (clobbered_v_may_defs)
- {
- ggc_free (clobbered_v_may_defs);
- ggc_free (clobbered_vuses);
- clobbered_v_may_defs = NULL;
- clobbered_vuses = NULL;
- }
- if (ro_call_vuses)
- {
- ggc_free (ro_call_vuses);
- ro_call_vuses = NULL;
- }
- ops_active = false;
-}
+static inline void
+finalize_ssa_defs (gimple stmt)
+{
+ unsigned new_i;
+ struct def_optype_d new_list;
+ def_optype_p old_ops, last;
+ 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);
-/* Return memory for operands of SIZE chunks. */
-
-static inline void *
-ssa_operand_alloc (unsigned size)
-{
- char *ptr;
- if (operand_memory_index + size >= SSA_OPERAND_MEMORY_SIZE)
+ /* Pre-pend the vdef we may have built. */
+ if (build_vdef != NULL_TREE)
{
- struct ssa_operand_memory_d *ptr;
- ptr = ggc_alloc (sizeof (struct ssa_operand_memory_d));
- ptr->next = operand_memory;
- operand_memory = ptr;
- operand_memory_index = 0;
+ 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;
}
- ptr = &(operand_memory->mem[operand_memory_index]);
- operand_memory_index += size;
- return ptr;
-}
-
-/* Make sure PTR is inn the correct immediate use list. Since uses are simply
- pointers into the stmt TREE, there is no way of telling if anyone has
- changed what this pointer points to via TREE_OPERANDS (exp, 0) = <...>.
- THe contents are different, but the the pointer is still the same. This
- routine will check to make sure PTR is in the correct list, and if it isn't
- put it in the correct list. We cannot simply check the previous node
- because all nodes in the same stmt might have be changed. */
+ new_list.next = NULL;
+ last = &new_list;
-static inline void
-correct_use_link (use_operand_p ptr, tree stmt)
-{
- use_operand_p prev;
- tree root;
+ old_ops = gimple_def_ops (stmt);
- /* Fold_stmt () may have changed the stmt pointers. */
- if (ptr->stmt != stmt)
- ptr->stmt = stmt;
+ new_i = 0;
- prev = ptr->prev;
- if (prev)
+ /* Clear and unlink a no longer necessary VDEF. */
+ if (build_vdef == NULL_TREE
+ && gimple_vdef (stmt) != NULL_TREE)
{
- bool stmt_mod = true;
- /* Find the first element which isn't a SAFE iterator, is in a different
- stmt, and is not a a modified stmt, That node is in the correct list,
- see if we are too. */
-
- while (stmt_mod)
+ if (TREE_CODE (gimple_vdef (stmt)) == SSA_NAME)
{
- while (prev->stmt == stmt || prev->stmt == NULL)
- prev = prev->prev;
- if (prev->use == NULL)
- stmt_mod = false;
- else
- if ((stmt_mod = stmt_modified_p (prev->stmt)))
- prev = prev->prev;
+ unlink_stmt_vdef (stmt);
+ release_ssa_name (gimple_vdef (stmt));
}
-
- /* Get the ssa_name of the list the node is in. */
- if (prev->use == NULL)
- root = prev->stmt;
- else
- root = *(prev->use);
- /* If it's the right list, simply return. */
- if (root == *(ptr->use))
- return;
+ gimple_set_vdef (stmt, NULL_TREE);
}
- /* Its in the wrong list if we reach here. */
- delink_imm_use (ptr);
- link_imm_use (ptr, *(ptr->use));
-}
-
-#define FINALIZE_OPBUILD build_defs
-#define FINALIZE_OPBUILD_BASE(I) opbuild_elem_real (&build_defs, (I))
-#define FINALIZE_OPBUILD_ELEM(I) opbuild_elem_real (&build_defs, (I))
-#define FINALIZE_FUNC finalize_ssa_def_ops
-#define FINALIZE_ALLOC alloc_def
-#define FINALIZE_FREE free_defs
-#define FINALIZE_TYPE struct def_optype_d
-#define FINALIZE_ELEM(PTR) ((PTR)->def_ptr)
-#define FINALIZE_OPS DEF_OPS
-#define FINALIZE_BASE(VAR) VAR
-#define FINALIZE_BASE_TYPE tree *
-#define FINALIZE_BASE_ZERO NULL
-#define FINALIZE_INITIALIZE(PTR, VAL, STMT) FINALIZE_ELEM (PTR) = (VAL)
-#include "tree-ssa-opfinalize.h"
+ /* 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));
+ /* 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;
-/* This routine will create stmt operands for STMT from the def build list. */
-
-static void
-finalize_ssa_defs (tree stmt)
-{
- unsigned int num = opbuild_num_elems (&build_defs);
- /* There should only be a single real definition per assignment. */
- gcc_assert ((stmt && TREE_CODE (stmt) != MODIFY_EXPR) || num <= 1);
+ /* If there is anything in the old list, free it. */
+ if (old_ops)
+ {
+ old_ops->next = gimple_ssa_operands (cfun)->free_defs;
+ gimple_ssa_operands (cfun)->free_defs = old_ops;
+ }
- /* 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. */
+ /* 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);
- finalize_ssa_def_ops (stmt);
- opbuild_clear (&build_defs);
+ /* Now set the stmt's operands. */
+ gimple_set_def_ops (stmt, new_list.next);
}
-#define FINALIZE_OPBUILD build_uses
-#define FINALIZE_OPBUILD_BASE(I) opbuild_elem_real (&build_uses, (I))
-#define FINALIZE_OPBUILD_ELEM(I) opbuild_elem_real (&build_uses, (I))
-#define FINALIZE_FUNC finalize_ssa_use_ops
-#define FINALIZE_ALLOC alloc_use
-#define FINALIZE_FREE free_uses
-#define FINALIZE_TYPE struct use_optype_d
-#define FINALIZE_ELEM(PTR) ((PTR)->use_ptr.use)
-#define FINALIZE_OPS USE_OPS
-#define FINALIZE_USE_PTR(PTR) USE_OP_PTR (PTR)
-#define FINALIZE_BASE(VAR) VAR
-#define FINALIZE_BASE_TYPE tree *
-#define FINALIZE_BASE_ZERO NULL
-#define FINALIZE_INITIALIZE(PTR, VAL, STMT) \
- (PTR)->use_ptr.use = (VAL); \
- link_imm_use_stmt (&((PTR)->use_ptr), \
- *(VAL), (STMT))
-#include "tree-ssa-opfinalize.h"
-
-/* 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 = opbuild_num_elems (&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 get_stmt_operands does not pass a pointer to a
- statement). */
- for (x = 0; x < num; x++)
- gcc_assert (*(opbuild_elem_real (&build_uses, x)) != stmt);
- }
-#endif
- finalize_ssa_use_ops (stmt);
- opbuild_clear (&build_uses);
-}
-
-
-/* Return a new v_may_def operand vector for STMT, comparing to OLD_OPS_P. */
-#define FINALIZE_OPBUILD build_v_may_defs
-#define FINALIZE_OPBUILD_ELEM(I) opbuild_elem_virtual (&build_v_may_defs, (I))
-#define FINALIZE_OPBUILD_BASE(I) opbuild_elem_uid (&build_v_may_defs, (I))
-#define FINALIZE_FUNC finalize_ssa_v_may_def_ops
-#define FINALIZE_ALLOC alloc_maydef
-#define FINALIZE_FREE free_maydefs
-#define FINALIZE_TYPE struct maydef_optype_d
-#define FINALIZE_ELEM(PTR) MAYDEF_RESULT (PTR)
-#define FINALIZE_OPS MAYDEF_OPS
-#define FINALIZE_USE_PTR(PTR) MAYDEF_OP_PTR (PTR)
-#define FINALIZE_BASE_ZERO 0
-#define FINALIZE_BASE(VAR) ((TREE_CODE (VAR) == SSA_NAME) \
- ? DECL_UID (SSA_NAME_VAR (VAR)) : DECL_UID ((VAR)))
-#define FINALIZE_BASE_TYPE unsigned
-#define FINALIZE_INITIALIZE(PTR, VAL, STMT) \
- (PTR)->def_var = (VAL); \
- (PTR)->use_var = (VAL); \
- (PTR)->use_ptr.use = &((PTR)->use_var); \
- link_imm_use_stmt (&((PTR)->use_ptr), \
- (VAL), (STMT))
-#include "tree-ssa-opfinalize.h"
-
-
-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. */
+/* Takes elements from build_uses and turns them into use operands of STMT.
+ TODO -- Make build_uses VEC of tree *. */
static inline void
-cleanup_v_may_defs (void)
+finalize_ssa_uses (gimple stmt)
{
- unsigned x, num;
- num = opbuild_num_elems (&build_v_may_defs);
+ unsigned new_i;
+ struct use_optype_d new_list;
+ use_optype_p old_ops, ptr, last;
- for (x = 0; x < num; x++)
+ /* Pre-pend the VUSE we may have built. */
+ if (build_vuse != NULL_TREE)
{
- tree t = opbuild_elem_virtual (&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;
- }
+ 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));
}
- opbuild_clear (&build_v_may_defs);
-}
-
-
-#define FINALIZE_OPBUILD build_vuses
-#define FINALIZE_OPBUILD_ELEM(I) opbuild_elem_virtual (&build_vuses, (I))
-#define FINALIZE_OPBUILD_BASE(I) opbuild_elem_uid (&build_vuses, (I))
-#define FINALIZE_FUNC finalize_ssa_vuse_ops
-#define FINALIZE_ALLOC alloc_vuse
-#define FINALIZE_FREE free_vuses
-#define FINALIZE_TYPE struct vuse_optype_d
-#define FINALIZE_ELEM(PTR) VUSE_OP (PTR)
-#define FINALIZE_OPS VUSE_OPS
-#define FINALIZE_USE_PTR(PTR) VUSE_OP_PTR (PTR)
-#define FINALIZE_BASE_ZERO 0
-#define FINALIZE_BASE(VAR) ((TREE_CODE (VAR) == SSA_NAME) \
- ? DECL_UID (SSA_NAME_VAR (VAR)) : DECL_UID ((VAR)))
-#define FINALIZE_BASE_TYPE unsigned
-#define FINALIZE_INITIALIZE(PTR, VAL, STMT) \
- (PTR)->use_var = (VAL); \
- (PTR)->use_ptr.use = &((PTR)->use_var); \
- link_imm_use_stmt (&((PTR)->use_ptr), \
- (VAL), (STMT))
-#include "tree-ssa-opfinalize.h"
-
-
-/* Return a new vuse operand vector, comparing to OLD_OPS_P. */
-
-static void
-finalize_ssa_vuses (tree stmt)
-{
- unsigned num, num_v_may_defs;
- int 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:
+ new_list.next = NULL;
+ last = &new_list;
- # VUSE <a_2>
- # a_3 = V_MAY_DEF <a_2>
- a = a + 1;
+ old_ops = gimple_use_ops (stmt);
- The VUSE <a_2> is superfluous because it is implied by the V_MAY_DEF
- operation. */
+ /* Clear a no longer necessary VUSE. */
+ if (build_vuse == NULL_TREE
+ && gimple_vuse (stmt) != NULL_TREE)
+ gimple_set_vuse (stmt, NULL_TREE);
- num = opbuild_num_elems (&build_vuses);
- num_v_may_defs = opbuild_num_elems (&build_v_may_defs);
+ /* If there is anything in the old list, free it. */
+ if (old_ops)
+ {
+ 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;
+ }
- if (num > 0 && num_v_may_defs > 0)
+ /* 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)
{
- int last = OPBUILD_LAST;
- vuse_index = opbuild_first (&build_vuses);
- for ( ; vuse_index != OPBUILD_LAST; )
- {
- tree vuse;
- vuse = opbuild_elem_virtual (&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)
- {
- vuse_index = opbuild_remove_elem (&build_vuses, vuse_index,
- last);
- continue;
- }
- }
- last = vuse_index;
- vuse_index = opbuild_next (&build_vuses, vuse_index);
- }
+ gimple_set_vuse (stmt, gimple_vop (cfun));
+ mark_sym_for_renaming (gimple_vop (cfun));
}
- else
- /* Clear out the in_list bits. */
- for (vuse_index = opbuild_first (&build_vuses);
- vuse_index != OPBUILD_LAST;
- vuse_index = opbuild_next (&build_vuses, vuse_index))
- {
- tree t = opbuild_elem_virtual (&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. */
- opbuild_clear (&build_vuses);
+ /* 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. */
+ gimple_set_use_ops (stmt, new_list.next);
}
-
-/* Return a new v_must_def operand vector for STMT, comparing to OLD_OPS_P. */
-
-#define FINALIZE_OPBUILD build_v_must_defs
-#define FINALIZE_OPBUILD_ELEM(I) opbuild_elem_virtual (&build_v_must_defs, (I))
-#define FINALIZE_OPBUILD_BASE(I) opbuild_elem_uid (&build_v_must_defs, (I))
-#define FINALIZE_FUNC finalize_ssa_v_must_def_ops
-#define FINALIZE_ALLOC alloc_mustdef
-#define FINALIZE_FREE free_mustdefs
-#define FINALIZE_TYPE struct mustdef_optype_d
-#define FINALIZE_ELEM(PTR) MUSTDEF_RESULT (PTR)
-#define FINALIZE_OPS MUSTDEF_OPS
-#define FINALIZE_USE_PTR(PTR) MUSTDEF_KILL_PTR (PTR)
-#define FINALIZE_BASE_ZERO 0
-#define FINALIZE_BASE(VAR) ((TREE_CODE (VAR) == SSA_NAME) \
- ? DECL_UID (SSA_NAME_VAR (VAR)) : DECL_UID ((VAR)))
-#define FINALIZE_BASE_TYPE unsigned
-#define FINALIZE_INITIALIZE(PTR, VAL, STMT) \
- (PTR)->def_var = (VAL); \
- (PTR)->kill_var = (VAL); \
- (PTR)->use_ptr.use = &((PTR)->kill_var);\
- link_imm_use_stmt (&((PTR)->use_ptr), \
- (VAL), (STMT))
-#include "tree-ssa-opfinalize.h"
-static void
-finalize_ssa_v_must_defs (tree stmt)
+/* Clear the in_list bits and empty the build array for VDEFs and
+ VUSEs. */
+
+static inline void
+cleanup_build_arrays (void)
{
- /* 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);
- opbuild_clear (&build_v_must_defs);
+ 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 ();
}
static inline void
start_ssa_stmt_operands (void)
{
- gcc_assert (opbuild_num_elems (&build_defs) == 0);
- gcc_assert (opbuild_num_elems (&build_uses) == 0);
- gcc_assert (opbuild_num_elems (&build_vuses) == 0);
- gcc_assert (opbuild_num_elems (&build_v_may_defs) == 0);
- gcc_assert (opbuild_num_elems (&build_v_must_defs) == 0);
+ gcc_assert (VEC_length (tree, build_defs) == 0);
+ gcc_assert (VEC_length (tree, build_uses) == 0);
+ gcc_assert (build_vuse == NULL_TREE);
+ gcc_assert (build_vdef == NULL_TREE);
}
static inline void
append_def (tree *def_p)
{
- opbuild_append_real (&build_defs, def_p);
+ VEC_safe_push (tree, heap, build_defs, (tree) def_p);
}
static inline void
append_use (tree *use_p)
{
- opbuild_append_real (&build_uses, 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);
+ if (!optimize)
+ return;
- /* Don't allow duplicate entries. */
- if (ann->in_v_may_def_list)
- return;
- ann->in_v_may_def_list = 1;
- }
+ gcc_assert ((build_vdef == NULL_TREE
+ || build_vdef == var)
+ && (build_vuse == NULL_TREE
+ || build_vuse == var));
- opbuild_append_virtual (&build_v_may_defs, var);
+ build_vdef = var;
+ build_vuse = var;
}
-/* Add VAR to the list of virtual uses. */
+/* Add VAR to the set of variables that require a VUSE operator. */
static inline void
append_vuse (tree var)
{
+ if (!optimize)
+ return;
- /* 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;
- }
+ gcc_assert (build_vuse == NULL_TREE
+ || build_vuse == var);
- opbuild_append_virtual (&build_vuses, var);
+ build_vuse = var;
}
+/* Add virtual operands for STMT. FLAGS is as in get_expr_operands. */
-/* Add VAR to the list of virtual must definitions for INFO. */
-
-static inline void
-append_v_must_def (tree var)
+static void
+add_virtual_operand (gimple stmt ATTRIBUTE_UNUSED, int flags)
{
- unsigned i;
+ /* 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;
- /* Don't allow duplicate entries. */
- for (i = 0; i < opbuild_num_elems (&build_v_must_defs); i++)
- if (var == opbuild_elem_virtual (&build_v_must_defs, i))
- return;
+ gcc_assert (!is_gimple_debug (stmt));
- opbuild_append_virtual (&build_v_must_defs, var);
+ if (flags & opf_def)
+ append_vdef (gimple_vop (cfun));
+ else
+ append_vuse (gimple_vop (cfun));
}
-/* Parse STMT looking for operands. OLD_OPS is the original stmt operand
- cache for STMT, if it existed before. When finished, the various build_*
- operand vectors will have potential operands. in them. */
-
+/* 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
-parse_ssa_operands (tree stmt)
+add_stmt_operand (tree *var_p, gimple stmt, int flags)
{
- enum tree_code code;
+ tree var, sym;
- code = TREE_CODE (stmt);
- switch (code)
- {
- case MODIFY_EXPR:
- /* First get operands from the RHS. For the LHS, we use a V_MAY_DEF if
- either only part of LHS is modified or if the RHS might throw,
- otherwise, use V_MUST_DEF.
+ gcc_assert (SSA_VAR_P (*var_p));
- ??? If it might throw, we should represent somehow that it is killed
- on the fallthrough path. */
- {
- tree lhs = TREE_OPERAND (stmt, 0);
- int lhs_flags = opf_is_def;
+ var = *var_p;
+ sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var);
- get_expr_operands (stmt, &TREE_OPERAND (stmt, 1), opf_none);
+ /* Mark statements with volatile operands. */
+ if (TREE_THIS_VOLATILE (sym))
+ gimple_set_has_volatile_ops (stmt, true);
- /* If the LHS is a VIEW_CONVERT_EXPR, it isn't changing whether
- or not the entire LHS is modified; that depends on what's
- inside the VIEW_CONVERT_EXPR. */
- if (TREE_CODE (lhs) == VIEW_CONVERT_EXPR)
- lhs = TREE_OPERAND (lhs, 0);
+ if (is_gimple_reg (sym))
+ {
+ /* The variable is a GIMPLE register. Add it to real operands. */
+ if (flags & opf_def)
+ append_def (var_p);
+ else
+ append_use (var_p);
+ }
+ else
+ add_virtual_operand (stmt, flags);
+}
- if (TREE_CODE (lhs) != ARRAY_REF && TREE_CODE (lhs) != ARRAY_RANGE_REF
- && TREE_CODE (lhs) != BIT_FIELD_REF
- && TREE_CODE (lhs) != REALPART_EXPR
- && TREE_CODE (lhs) != IMAGPART_EXPR)
- lhs_flags |= opf_kill_def;
+/* 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). */
- get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), lhs_flags);
- }
- break;
+static void
+mark_address_taken (tree ref)
+{
+ tree var;
- case COND_EXPR:
- get_expr_operands (stmt, &COND_EXPR_COND (stmt), opf_none);
- break;
+ /* 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;
+}
- case SWITCH_EXPR:
- get_expr_operands (stmt, &SWITCH_COND (stmt), opf_none);
- break;
- case ASM_EXPR:
- get_asm_expr_operands (stmt);
- break;
+/* A subroutine of get_expr_operands to handle INDIRECT_REF,
+ ALIGN_INDIRECT_REF and MISALIGNED_INDIRECT_REF.
- case RETURN_EXPR:
- get_expr_operands (stmt, &TREE_OPERAND (stmt, 0), opf_none);
- break;
+ STMT is the statement being processed, EXPR is the INDIRECT_REF
+ that got us here.
- case GOTO_EXPR:
- get_expr_operands (stmt, &GOTO_DESTINATION (stmt), opf_none);
- break;
+ FLAGS is as in get_expr_operands.
- case LABEL_EXPR:
- get_expr_operands (stmt, &LABEL_EXPR_LABEL (stmt), opf_none);
- break;
+ 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. */
- /* These nodes contain no variable references. */
- 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:
- break;
+static void
+get_indirect_ref_operands (gimple stmt, tree expr, int flags,
+ bool recurse_on_base)
+{
+ tree *pptr = &TREE_OPERAND (expr, 0);
- 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
- append_use. 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;
- }
-}
+ if (TREE_THIS_VOLATILE (expr))
+ gimple_set_has_volatile_ops (stmt, true);
-/* Create an operands cache for STMT, returning it in NEW_OPS. OLD_OPS are the
- original operands, and if ANN is non-null, appropriate stmt flags are set
- in the stmt's annotation. If ANN is NULL, this is not considered a "real"
- stmt, and none of the operands will be entered into their respective
- immediate uses tables. This is to allow stmts to be processed when they
- are not actually in the CFG.
+ /* Add the VOP. */
+ add_virtual_operand (stmt, flags);
- Note that some fields in old_ops may change to NULL, although none of the
- memory they originally pointed to will be destroyed. It is appropriate
- to call free_stmt_operands() on the value returned in old_ops.
+ /* If requested, add a USE operand for the base pointer. */
+ if (recurse_on_base)
+ get_expr_operands (stmt, pptr,
+ opf_use | (flags & opf_no_vops));
+}
- The rationale for this: Certain optimizations wish to examine the difference
- between new_ops and old_ops after processing. If a set of operands don't
- change, new_ops will simply assume the pointer in old_ops, and the old_ops
- pointer will be set to NULL, indicating no memory needs to be cleared.
- Usage might appear something like:
- old_ops_copy = old_ops = stmt_ann(stmt)->operands;
- build_ssa_operands (stmt, NULL, &old_ops, &new_ops);
- <* compare old_ops_copy and new_ops *>
- free_ssa_operands (old_ops); */
+/* A subroutine of get_expr_operands to handle TARGET_MEM_REF. */
static void
-build_ssa_operands (tree stmt)
+get_tmr_operands (gimple stmt, tree expr, int flags)
{
- stmt_ann_t ann = get_stmt_ann (stmt);
-
- /* Initially assume that the statement has no volatile operands, nor
- makes aliased loads or stores. */
- if (ann)
- {
- ann->has_volatile_ops = false;
- ann->makes_aliased_stores = false;
- ann->makes_aliased_loads = false;
- }
+ if (TREE_THIS_VOLATILE (expr))
+ gimple_set_has_volatile_ops (stmt, true);
- start_ssa_stmt_operands ();
+ /* First record the real operands. */
+ 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));
- parse_ssa_operands (stmt);
+ if (TMR_SYMBOL (expr))
+ mark_address_taken (TMR_SYMBOL (expr));
- finalize_ssa_stmt_operands (stmt);
+ add_virtual_operand (stmt, flags);
}
-/* Free any operands vectors in OPS. */
-#if 0
-static void
-free_ssa_operands (stmt_operands_p ops)
+/* 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
+maybe_add_call_vops (gimple stmt)
{
- ops->def_ops = NULL;
- ops->use_ops = NULL;
- ops->maydef_ops = NULL;
- ops->mustdef_ops = NULL;
- ops->vuse_ops = NULL;
- while (ops->memory.next != NULL)
+ int call_flags = gimple_call_flags (stmt);
+
+ /* If aliases have been computed already, add VDEF or VUSE
+ operands for all the symbols that have been found to be
+ call-clobbered. */
+ if (!(call_flags & ECF_NOVOPS))
{
- operand_memory_p tmp = ops->memory.next;
- ops->memory.next = tmp->next;
- ggc_free (tmp);
+ /* 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_virtual_operand (stmt, opf_use);
}
}
-#endif
-/* Get the operands of statement STMT. Note that repeated calls to
- get_stmt_operands for the same statement will do nothing until the
- statement is marked modified by a call to mark_stmt_modified(). */
+/* Scan operands in the ASM_EXPR stmt referred to in INFO. */
-void
-update_stmt_operands (tree stmt)
+static void
+get_asm_expr_operands (gimple stmt)
{
- stmt_ann_t ann = get_stmt_ann (stmt);
- /* If get_stmt_operands is called before SSA is initialized, dont
- do anything. */
- 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. Subsequent calls to
- get_stmt_operands for this statement will do nothing until the
- statement is marked modified by a call to mark_stmt_modified(). */
- ann->modified = 0;
-
- timevar_pop (TV_TREE_OPS);
-}
+ size_t i, noutputs;
+ const char **oconstraints;
+ const char *constraint;
+ bool allows_mem, allows_reg, is_inout;
-
-/* Copies virtual operands from SRC to DST. */
+ noutputs = gimple_asm_noutputs (stmt);
+ oconstraints = (const char **) alloca ((noutputs) * sizeof (const char *));
-void
-copy_virtual_operands (tree dest, tree src)
-{
- 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 virtuial 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 (opbuild_num_elems (&build_vuses) == 0
- && opbuild_num_elems (&build_v_may_defs) == 0
- && opbuild_num_elems (&build_v_must_defs) == 0)
- return;
+ /* 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,
+ &allows_reg, &is_inout);
- /* Now commit the virtual operands to this stmt. */
- finalize_ssa_v_must_defs (dest);
- finalize_ssa_v_may_defs (dest);
- finalize_ssa_vuses (dest);
+ /* This should have been split in gimplify_asm_expr. */
+ gcc_assert (!allows_reg || !is_inout);
- /* Finally, set the field to the same values as then originals. */
+ /* Memory operands are addressable. Note that STMT needs the
+ address of this operand. */
+ if (!allows_reg && allows_mem)
+ mark_address_taken (TREE_VALUE (link));
-
- t = op_iter_init_tree (&old_iter, src, SSA_OP_VUSE);
- FOR_EACH_SSA_USE_OPERAND (use_p, dest, iter, SSA_OP_VUSE)
- {
- gcc_assert (!op_iter_done (&old_iter));
- SET_USE (use_p, t);
- t = op_iter_next_tree (&old_iter);
+ get_expr_operands (stmt, &TREE_VALUE (link), opf_def);
}
- 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)
+ /* Gather all input operands. */
+ for (i = 0; i < gimple_asm_ninputs (stmt); i++)
{
- 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);
+ 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);
+
+ /* Memory operands are addressable. Note that STMT needs the
+ address of this operand. */
+ if (!allows_reg && allows_mem)
+ mark_address_taken (TREE_VALUE (link));
+
+ get_expr_operands (stmt, &TREE_VALUE (link), 0);
}
- 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)
+ /* Clobber all memory and addressable symbols for asm ("" : : : "memory"); */
+ for (i = 0; i < gimple_asm_nclobbers (stmt); i++)
{
- 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);
+ 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;
+ }
}
- 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. */
+/* Recursively scan the expression pointed to by EXPR_P in statement
+ STMT. FLAGS is one of the OPF_* constants modifying how to
+ interpret the operands found. */
-void
-create_ssa_artficial_load_stmt (tree new_stmt, tree old_stmt)
+static void
+get_expr_operands (gimple stmt, tree *expr_p, int flags)
{
- stmt_ann_t ann;
- tree op;
- ssa_op_iter iter;
- use_operand_p use_p;
- unsigned x;
+ enum tree_code code;
+ enum tree_code_class codeclass;
+ tree expr = *expr_p;
+ int uflags = opf_use;
+
+ if (expr == NULL)
+ return;
- ann = get_stmt_ann (new_stmt);
+ if (is_gimple_debug (stmt))
+ uflags |= (flags & opf_no_vops);
- /* process the stmt looking for operands. */
- start_ssa_stmt_operands ();
- parse_ssa_operands (new_stmt);
+ code = TREE_CODE (expr);
+ codeclass = TREE_CODE_CLASS (code);
- for (x = 0; x < opbuild_num_elems (&build_vuses); x++)
- {
- tree t = opbuild_elem_virtual (&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 < opbuild_num_elems (&build_v_may_defs); x++)
- {
- tree t = opbuild_elem_virtual (&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;
- }
- }
- /* Remove any virtual operands that were found. */
- opbuild_clear (&build_v_may_defs);
- opbuild_clear (&build_v_must_defs);
- opbuild_clear (&build_vuses);
-
- /* 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);
-}
-
-static void
-swap_tree_operands (tree stmt, tree *exp0, tree *exp1)
-{
- tree op0, op1;
- op0 = *exp0;
- op1 = *exp1;
-
- /* If the operand cache is active, attempt to preserve the relative positions
- of these two operands in their respective immediate use lists. */
- if (ssa_operands_active () && op0 != op1)
- {
- use_optype_p use0, use1, ptr;
- use0 = use1 = NULL;
- /* Find the 2 operands in the cache, if they are there. */
- for (ptr = 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)
- if (USE_OP_PTR (ptr)->use == exp1)
- {
- use1 = ptr;
- break;
- }
- /* If both uses don't have operand entries, there isn't much we can do
- at this point. Presumably we dont need to worry about it. */
- if (use0 && use1)
- {
- tree *tmp = USE_OP_PTR (use1)->use;
- USE_OP_PTR (use1)->use = USE_OP_PTR (use0)->use;
- USE_OP_PTR (use0)->use = tmp;
- }
- }
-
- /* Now swap the data. */
- *exp0 = op1;
- *exp1 = op0;
-}
-
-
-/* Recursively scan the expression pointed by EXPR_P in statement referred to
- by INFO. FLAGS is one of the OPF_* constants modifying how to interpret the
- operands found. */
-
-static void
-get_expr_operands (tree stmt, tree *expr_p, int flags)
-{
- enum tree_code code;
- enum tree_code_class class;
- tree expr = *expr_p;
- stmt_ann_t s_ann = stmt_ann (stmt);
-
- if (expr == NULL)
- return;
-
- code = TREE_CODE (expr);
- class = TREE_CODE_CLASS (code);
-
- switch (code)
+ switch (code)
{
case ADDR_EXPR:
- /* We could have the address of a component, array member,
- etc which has interesting variable references. */
/* Taking the address of a variable does not represent a
- reference to it, but the fact that the stmt takes its address will be
- of interest to some passes (e.g. alias resolution). */
- add_stmt_operand (expr_p, s_ann, 0);
-
- /* If the address is invariant, there may be no interesting variable
- references inside. */
+ reference to it, but the fact that the statement takes its
+ address will be of interest to some passes (e.g. alias
+ resolution). */
+ 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. */
if (is_gimple_min_invariant (expr))
return;
- /* There should be no VUSEs created, since the referenced objects are
- not really accessed. The only operands that we should find here
- are ARRAY_REF indices which will always be real operands (GIMPLE
- does not allow non-registers as array indices). */
+ /* Otherwise, there may be variables referenced inside but there
+ should be no VUSEs created, since the referenced objects are
+ not really accessed. The only operands that we should find
+ here are ARRAY_REF indices which will always be real operands
+ (GIMPLE does not allow non-registers as array indices). */
flags |= opf_no_vops;
-
get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
return;
case SSA_NAME:
+ add_stmt_operand (expr_p, stmt, flags);
+ return;
+
case VAR_DECL:
case PARM_DECL:
case RESULT_DECL:
- case CONST_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);
- }
- return;
- }
+ add_stmt_operand (expr_p, stmt, flags);
+ 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);
/* fall through */
case ALIGN_INDIRECT_REF:
case INDIRECT_REF:
- get_indirect_ref_operands (stmt, expr, flags);
+ get_indirect_ref_operands (stmt, expr, flags, true);
return;
- case ARRAY_REF:
- case ARRAY_RANGE_REF:
- /* Treat array references as references to the virtual variable
- representing the array. The virtual variable for an ARRAY_REF
- is the VAR_DECL for the array. */
-
- /* Add the virtual variable for the ARRAY_REF to VDEFS or VUSES
- according to the value of IS_DEF. Recurse if the LHS of the
- ARRAY_REF node is not a regular variable. */
- if (SSA_VAR_P (TREE_OPERAND (expr, 0)))
- add_stmt_operand (expr_p, s_ann, flags);
- else
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
-
- 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);
+ case TARGET_MEM_REF:
+ get_tmr_operands (stmt, expr, flags);
return;
+ case ARRAY_REF:
+ case ARRAY_RANGE_REF:
case COMPONENT_REF:
case REALPART_EXPR:
case IMAGPART_EXPR:
{
- tree ref;
- HOST_WIDE_INT offset, size;
- /* This component ref 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 = okay_component_ref_for_subvars (expr, &offset, &size);
- if (ref)
- {
- subvar_t svars = get_subvars_for_var (ref);
- subvar_t sv;
- for (sv = svars; sv; sv = sv->next)
- {
- bool exact;
- if (overlap_subvar (offset, size, sv, &exact))
- {
- if (exact)
- flags &= ~opf_kill_def;
- add_stmt_operand (&sv->var, s_ann, flags);
- }
- }
- }
- else
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0),
- flags & ~opf_kill_def);
-
+ if (TREE_THIS_VOLATILE (expr))
+ gimple_set_has_volatile_ops (stmt, true);
+
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
+
if (code == COMPONENT_REF)
- 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), 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);
+ 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 MODIFY_EXPR:
- {
- int subflags;
- tree op;
-
- get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none);
-
- op = TREE_OPERAND (expr, 0);
- if (TREE_CODE (op) == WITH_SIZE_EXPR)
- op = TREE_OPERAND (expr, 0);
- if (TREE_CODE (op) == ARRAY_REF
- || TREE_CODE (op) == ARRAY_RANGE_REF
- || TREE_CODE (op) == REALPART_EXPR
- || TREE_CODE (op) == IMAGPART_EXPR)
- subflags = opf_is_def;
- else
- subflags = opf_is_def | opf_kill_def;
-
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), subflags);
- return;
- }
-
case CONSTRUCTOR:
{
/* General aggregate CONSTRUCTORs have been decomposed, but they
are still in use as the COMPLEX_EXPR equivalent for vectors. */
+ constructor_elt *ce;
+ unsigned HOST_WIDE_INT idx;
- tree t;
- for (t = TREE_OPERAND (expr, 0); t ; t = TREE_CHAIN (t))
- get_expr_operands (stmt, &TREE_VALUE (t), opf_none);
+ for (idx = 0;
+ VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (expr), idx, ce);
+ idx++)
+ get_expr_operands (stmt, &ce->value, uflags);
return;
}
- case TRUTH_NOT_EXPR:
case BIT_FIELD_REF:
+ if (TREE_THIS_VOLATILE (expr))
+ gimple_set_has_volatile_ops (stmt, true);
+ /* FALLTHRU */
+
+ case TRUTH_NOT_EXPR:
case VIEW_CONVERT_EXPR:
do_unary:
get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
case ASSERT_EXPR:
do_binary:
{
- tree op0 = TREE_OPERAND (expr, 0);
- tree op1 = TREE_OPERAND (expr, 1);
-
- /* If it would be profitable to swap the operands, then do so to
- canonicalize the statement, enabling better optimization.
-
- By placing canonicalization of such expressions here we
- transparently keep statements in canonical form, even
- when the statement is modified. */
- if (tree_swap_operands_p (op0, op1, false))
- {
- /* For relationals we need to swap the operands
- and change the code. */
- if (code == LT_EXPR
- || code == GT_EXPR
- || code == LE_EXPR
- || code == GE_EXPR)
- {
- TREE_SET_CODE (expr, swap_tree_comparison (code));
- swap_tree_operands (stmt,
- &TREE_OPERAND (expr, 0),
- &TREE_OPERAND (expr, 1));
- }
-
- /* For a commutative operator we can just swap the operands. */
- else if (commutative_tree_code (code))
- {
- swap_tree_operands (stmt,
- &TREE_OPERAND (expr, 0),
- &TREE_OPERAND (expr, 1));
- }
- }
-
get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags);
return;
}
+ case DOT_PROD_EXPR:
case REALIGN_LOAD_EXPR:
{
get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags);
return;
}
- case BLOCK:
case FUNCTION_DECL:
- case EXC_PTR_EXPR:
- case FILTER_EXPR:
case LABEL_DECL:
+ case CONST_DECL:
+ 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;
}
fprintf (stderr, "unhandled expression in get_expr_operands():\n");
debug_tree (expr);
fputs ("\n", stderr);
- internal_error ("internal error");
#endif
gcc_unreachable ();
}
-/* Scan operands in the ASM_EXPR stmt referred to in INFO. */
+/* Parse STMT looking for operands. When finished, the various
+ build_* operand vectors will have potential operands in them. */
static void
-get_asm_expr_operands (tree stmt)
+parse_ssa_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;
- const char *constraint;
- bool allows_mem, allows_reg, is_inout;
+ enum gimple_code code = gimple_code (stmt);
- for (i=0, link = ASM_OUTPUTS (stmt); link; ++i, link = TREE_CHAIN (link))
+ if (code == GIMPLE_ASM)
+ get_asm_expr_operands (stmt);
+ else if (is_gimple_debug (stmt))
{
- oconstraints[i] = constraint
- = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
- parse_output_constraint (&constraint, i, 0, 0,
- &allows_mem, &allows_reg, &is_inout);
-
- /* This should have been split in gimplify_asm_expr. */
- gcc_assert (!allows_reg || !is_inout);
-
- /* 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))
- note_addressable (t, s_ann);
- }
-
- get_expr_operands (stmt, &TREE_VALUE (link), opf_is_def);
- }
-
- for (link = ASM_INPUTS (stmt); link; link = TREE_CHAIN (link))
- {
- constraint
- = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (link)));
- parse_input_constraint (&constraint, 0, 0, noutputs, 0,
- oconstraints, &allows_mem, &allows_reg);
-
- /* Memory operands are addressable. Note that STMT needs the
- address of this operand. */
- if (!allows_reg && allows_mem)
- {
- tree t = get_base_address (TREE_VALUE (link));
- if (t && DECL_P (t))
- note_addressable (t, s_ann);
- }
-
- get_expr_operands (stmt, &TREE_VALUE (link), 0);
+ 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);
}
-
-
- /* 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 (global_var)
- add_stmt_operand (&global_var, s_ann, opf_is_def);
- else
- EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, i, bi)
- {
- tree var = referenced_var (i);
- add_stmt_operand (&var, s_ann, opf_is_def);
- }
-
- /* Now clobber all addressables. */
- EXECUTE_IF_SET_IN_BITMAP (addressable_vars, 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);
- }
-
- break;
- }
-}
-
-/* A subroutine of get_expr_operands to handle INDIRECT_REF,
- ALIGN_INDIRECT_REF and MISALIGNED_INDIRECT_REF. */
-
-static void
-get_indirect_ref_operands (tree stmt, tree expr, int flags)
-{
- 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))
+ else
{
- struct ptr_info_def *pi = NULL;
+ size_t i, start = 0;
- /* 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)
+ if (code == GIMPLE_ASSIGN || code == GIMPLE_CALL)
{
- /* PTR has its own memory tag. Use it. */
- add_stmt_operand (&pi->name_mem_tag, s_ann, flags);
+ get_expr_operands (stmt, gimple_op_ptr (stmt, 0), opf_def);
+ start = 1;
}
- else
- {
- /* If PTR is not an SSA_NAME or it doesn't have a name
- tag, use its type 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->type_mem_tag)
- add_stmt_operand (&v_ann->type_mem_tag, s_ann, flags);
- }
- }
- /* 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. */
- else if (TREE_CODE (ptr) == INTEGER_CST)
- {
- if (s_ann)
- s_ann->has_volatile_ops = true;
- return;
- }
+ for (i = start; i < gimple_num_ops (stmt); i++)
+ get_expr_operands (stmt, gimple_op_ptr (stmt, i), opf_use);
- /* Everything else *should* have been folded elsewhere, but users
- are smarter than we in finding ways to write invalid code. We
- cannot just assert here. If we were absolutely certain that we
- do handle all valid cases, then we could just do nothing here.
- That seems optimistic, so attempt to do something logical... */
- else if ((TREE_CODE (ptr) == PLUS_EXPR || TREE_CODE (ptr) == MINUS_EXPR)
- && TREE_CODE (TREE_OPERAND (ptr, 0)) == ADDR_EXPR
- && TREE_CODE (TREE_OPERAND (ptr, 1)) == INTEGER_CST)
- {
- /* Make sure we know the object is addressable. */
- pptr = &TREE_OPERAND (ptr, 0);
- add_stmt_operand (pptr, s_ann, 0);
-
- /* Mark the object itself with a VUSE. */
- pptr = &TREE_OPERAND (*pptr, 0);
- get_expr_operands (stmt, pptr, flags);
- return;
+ /* Add call-clobbered operands, if needed. */
+ if (code == GIMPLE_CALL)
+ maybe_add_call_vops (stmt);
}
-
- /* Ok, this isn't even is_gimple_min_invariant. Something's broke. */
- else
- gcc_unreachable ();
-
- /* Add a USE operand for the base pointer. */
- get_expr_operands (stmt, pptr, opf_none);
}
-/* A subroutine of get_expr_operands to handle CALL_EXPR. */
+
+/* Create an operands cache for STMT. */
static void
-get_call_expr_operands (tree stmt, tree expr)
+build_ssa_operands (gimple stmt)
{
- tree op;
- int call_flags = call_expr_flags (expr);
-
- /* If aliases have been computed already, add V_MAY_DEF or V_USE
- 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 (aliases_computed_p
- && !bitmap_empty_p (call_clobbered_vars)
- && !(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);
- else if (!(call_flags & ECF_CONST))
- add_call_read_ops (stmt);
- }
-
- /* 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);
+ /* Initially assume that the statement has no volatile operands. */
+ gimple_set_has_volatile_ops (stmt, false);
+ start_ssa_stmt_operands ();
+ parse_ssa_operands (stmt);
+ finalize_ssa_stmt_operands (stmt);
}
-/* Add *VAR_P to the appropriate operand array for INFO. 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. */
+/* Releases the operands of STMT back to their freelists, and clears
+ the stmt operand lists. */
-static void
-add_stmt_operand (tree *var_p, stmt_ann_t s_ann, int flags)
+void
+free_stmt_operands (gimple stmt)
{
- bool is_real_op;
- tree var, sym;
- var_ann_t v_ann;
+ def_optype_p defs = gimple_def_ops (stmt), last_def;
+ use_optype_p uses = gimple_use_ops (stmt), last_use;
- var = *var_p;
- STRIP_NOPS (var);
-
- /* If the operand is an ADDR_EXPR, add its operand to the list of
- variables that have had their address taken in this statement. */
- if (TREE_CODE (var) == ADDR_EXPR)
+ if (defs)
{
- note_addressable (TREE_OPERAND (var, 0), s_ann);
- return;
+ 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);
}
- /* If the original variable is not a scalar, it will be added to the list
- of virtual operands. In that case, use its base symbol as the virtual
- variable representing it. */
- is_real_op = is_gimple_reg (var);
- if (!is_real_op && !DECL_P (var))
- var = get_virtual_var (var);
-
- /* If VAR is not a variable that we care to optimize, do nothing. */
- if (var == NULL_TREE || !SSA_VAR_P (var))
- return;
-
- 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 writeable variables. So we only
- check that this only happens on stores, and not writes to GIMPLE
- registers.
-
- FIXME: The C++ FE is emitting assignments in the IL stream for
- read-only globals. This is wrong, but for the time being disable
- this transformation on V_MUST_DEF operands (otherwise, we
- mis-optimize SPEC2000's eon). */
- if ((flags & opf_is_def)
- && !(flags & opf_kill_def)
- && unmodifiable_var_p (var))
+ if (uses)
{
- gcc_assert (!is_real_op);
- flags &= ~opf_is_def;
+ 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);
}
- if (is_real_op)
- {
- /* The variable is a GIMPLE register. Add it to real operands. */
- if (flags & opf_is_def)
- append_def (var_p);
- else
- append_use (var_p);
- }
- else
+ if (gimple_has_mem_ops (stmt))
{
- varray_type aliases;
-
- /* 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
- 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)
- {
- /* Only regular variables or struct fields may get a
- V_MUST_DEF operand. */
- gcc_assert (v_ann->mem_tag_kind == NOT_A_TAG
- || v_ann->mem_tag_kind == STRUCT_FIELD);
- /* V_MUST_DEF for non-aliased, non-GIMPLE register
- variable definitions. */
- 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);
- if (s_ann && v_ann->is_alias_tag)
- s_ann->makes_aliased_loads = 1;
- }
- }
- else
- {
- size_t i;
-
- /* The variable is aliased. Add its aliases to the virtual
- operands. */
- gcc_assert (VARRAY_ACTIVE_SIZE (aliases) != 0);
-
- if (flags & opf_is_def)
- {
- bool added_may_defs_p = false;
-
- /* 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. */
- if (v_ann->is_alias_tag)
- {
- added_may_defs_p = true;
- append_v_may_def (var);
- }
-
- for (i = 0; i < VARRAY_ACTIVE_SIZE (aliases); i++)
- {
- /* While VAR may be modifiable, some of its aliases
- may not be. If that's the case, we don't really
- need to add them a V_MAY_DEF for them. */
- tree alias = VARRAY_TREE (aliases, i);
-
- if (unmodifiable_var_p (alias))
- append_vuse (alias);
- else
- {
- append_v_may_def (alias);
- added_may_defs_p = true;
- }
- }
-
- if (s_ann && added_may_defs_p)
- s_ann->makes_aliased_stores = 1;
- }
- else
- {
- /* Similarly, append a virtual uses for VAR itself, when
- it is an alias tag. */
- if (v_ann->is_alias_tag)
- append_vuse (var);
-
- for (i = 0; i < VARRAY_ACTIVE_SIZE (aliases); i++)
- append_vuse (VARRAY_TREE (aliases, i));
-
- if (s_ann)
- s_ann->makes_aliased_loads = 1;
- }
- }
+ gimple_set_vuse (stmt, NULL_TREE);
+ gimple_set_vdef (stmt, NULL_TREE);
}
}
-
-/* Record that VAR had its address taken in the statement with annotations
- S_ANN. */
-static void
-note_addressable (tree var, stmt_ann_t s_ann)
-{
- tree ref;
- subvar_t svars;
- HOST_WIDE_INT offset;
- HOST_WIDE_INT size;
-
- if (!s_ann)
- return;
-
- /* If this is a COMPONENT_REF, and we know exactly what it touches, we only
- take the address of the subvariables it will touch.
- Otherwise, we take the address of all the subvariables, plus the real
- ones. */
-
- if (var && TREE_CODE (var) == COMPONENT_REF
- && (ref = okay_component_ref_for_subvars (var, &offset, &size)))
- {
- subvar_t sv;
- svars = get_subvars_for_var (ref);
-
- if (s_ann->addresses_taken == NULL)
- s_ann->addresses_taken = BITMAP_GGC_ALLOC ();
-
- for (sv = svars; sv; sv = sv->next)
- {
- if (overlap_subvar (offset, size, sv, NULL))
- bitmap_set_bit (s_ann->addresses_taken, var_ann (sv->var)->uid);
- }
- return;
- }
-
- var = get_base_address (var);
- if (var && SSA_VAR_P (var))
- {
- if (s_ann->addresses_taken == NULL)
- s_ann->addresses_taken = BITMAP_GGC_ALLOC ();
-
+/* Get the operands of statement STMT. */
- 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 (s_ann->addresses_taken, var_ann (sv->var)->uid);
- }
- else
- bitmap_set_bit (s_ann->addresses_taken, var_ann (var)->uid);
- }
-}
-
-/* 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)
+void
+update_stmt_operands (gimple stmt)
{
- int i;
- unsigned u;
- tree t;
- bitmap_iterator bi;
- stmt_ann_t s_ann = stmt_ann (stmt);
- struct stmt_ann_d empty_ann;
-
- /* 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 (global_var)
- {
- add_stmt_operand (&global_var, s_ann, opf_is_def);
- return;
- }
-
- /* If cache is valid, copy the elements into the build vectors. */
- if (ssa_call_clobbered_cache_valid)
- {
- /* Process the caches in reverse order so we are always inserting at
- the head of the list. */
- for (i = VARRAY_ACTIVE_SIZE (clobbered_vuses) - 1; i >=0; i--)
- {
- t = VARRAY_TREE (clobbered_vuses, i);
- gcc_assert (TREE_CODE (t) != SSA_NAME);
- var_ann (t)->in_vuse_list = 1;
- opbuild_append_virtual (&build_vuses, t);
- }
- for (i = VARRAY_ACTIVE_SIZE (clobbered_v_may_defs) - 1; i >= 0; i--)
- {
- t = VARRAY_TREE (clobbered_v_may_defs, i);
- gcc_assert (TREE_CODE (t) != SSA_NAME);
- var_ann (t)->in_v_may_def_list = 1;
- opbuild_append_virtual (&build_v_may_defs, t);
- }
- if (s_ann)
- {
- s_ann->makes_aliased_loads = clobbered_aliased_loads;
- s_ann->makes_aliased_stores = clobbered_aliased_stores;
- }
- return;
- }
-
- memset (&empty_ann, 0, sizeof (struct stmt_ann_d));
-
- /* Add a V_MAY_DEF operand for every call clobbered variable. */
- EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, u, bi)
- {
- tree var = referenced_var (u);
- if (unmodifiable_var_p (var))
- add_stmt_operand (&var, &empty_ann, opf_none);
- else
- add_stmt_operand (&var, &empty_ann, opf_is_def);
- }
-
- clobbered_aliased_loads = empty_ann.makes_aliased_loads;
- clobbered_aliased_stores = empty_ann.makes_aliased_stores;
-
- /* Set the flags for a stmt's annotation. */
- if (s_ann)
- {
- s_ann->makes_aliased_loads = empty_ann.makes_aliased_loads;
- s_ann->makes_aliased_stores = empty_ann.makes_aliased_stores;
- }
-
- /* Prepare empty cache vectors. */
- if (clobbered_v_may_defs)
- {
- VARRAY_POP_ALL (clobbered_vuses);
- VARRAY_POP_ALL (clobbered_v_may_defs);
- }
- else
- {
- VARRAY_TREE_INIT (clobbered_v_may_defs, 10, "clobbered_v_may_defs");
- VARRAY_TREE_INIT (clobbered_vuses, 10, "clobbered_vuses");
- }
-
- /* Now fill the clobbered cache with the values that have been found. */
- for (i = opbuild_first (&build_vuses);
- i != OPBUILD_LAST;
- i = opbuild_next (&build_vuses, i))
- VARRAY_PUSH_TREE (clobbered_vuses, opbuild_elem_virtual (&build_vuses, i));
-
- gcc_assert (opbuild_num_elems (&build_vuses)
- == VARRAY_ACTIVE_SIZE (clobbered_vuses));
+ /* If update_stmt_operands is called before SSA is initialized, do
+ nothing. */
+ if (!ssa_operands_active ())
+ return;
- for (i = opbuild_first (&build_v_may_defs);
- i != OPBUILD_LAST;
- i = opbuild_next (&build_v_may_defs, i))
- VARRAY_PUSH_TREE (clobbered_v_may_defs,
- opbuild_elem_virtual (&build_v_may_defs, i));
+ timevar_push (TV_TREE_OPS);
- gcc_assert (opbuild_num_elems (&build_v_may_defs)
- == VARRAY_ACTIVE_SIZE (clobbered_v_may_defs));
+ gcc_assert (gimple_modified_p (stmt));
+ build_ssa_operands (stmt);
+ gimple_set_modified (stmt, false);
- ssa_call_clobbered_cache_valid = true;
+ timevar_pop (TV_TREE_OPS);
}
-/* Add VUSE operands for .GLOBAL_VAR or all call clobbered variables in the
- function. */
+/* Swap operands EXP0 and EXP1 in statement STMT. No attempt is done
+ to test the validity of the swap operation. */
-static void
-add_call_read_ops (tree stmt)
+void
+swap_tree_operands (gimple stmt, tree *exp0, tree *exp1)
{
- int i;
- unsigned u;
- tree t;
- bitmap_iterator bi;
- stmt_ann_t s_ann = stmt_ann (stmt);
- struct stmt_ann_d empty_ann;
-
- /* 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 (global_var)
- {
- add_stmt_operand (&global_var, s_ann, opf_none);
- return;
- }
-
- /* If cache is valid, copy the elements into the build vector. */
- if (ssa_ro_call_cache_valid)
- {
- for (i = VARRAY_ACTIVE_SIZE (ro_call_vuses) - 1; i >=0 ; i--)
- {
- /* Process the caches in reverse order so we are always inserting at
- the head of the list. */
- t = VARRAY_TREE (ro_call_vuses, i);
- gcc_assert (TREE_CODE (t) != SSA_NAME);
- var_ann (t)->in_vuse_list = 1;
- opbuild_append_virtual (&build_vuses, t);
- }
- if (s_ann)
- s_ann->makes_aliased_loads = ro_call_aliased_loads;
- return;
- }
-
- memset (&empty_ann, 0, sizeof (struct stmt_ann_d));
+ tree op0, op1;
+ op0 = *exp0;
+ op1 = *exp1;
- /* Add a VUSE for each call-clobbered variable. */
- EXECUTE_IF_SET_IN_BITMAP (call_clobbered_vars, 0, u, bi)
+ /* If the operand cache is active, attempt to preserve the relative
+ positions of these two operands in their respective immediate use
+ lists. */
+ if (ssa_operands_active () && op0 != op1)
{
- tree var = referenced_var (u);
- add_stmt_operand (&var, &empty_ann, opf_none);
- }
-
- ro_call_aliased_loads = empty_ann.makes_aliased_loads;
- if (s_ann)
- s_ann->makes_aliased_loads = empty_ann.makes_aliased_loads;
-
- /* Prepare empty cache vectors. */
- if (ro_call_vuses)
- VARRAY_POP_ALL (ro_call_vuses);
- else
- VARRAY_TREE_INIT (ro_call_vuses, 10, "ro_call_vuses");
+ use_optype_p use0, use1, ptr;
+ use0 = use1 = NULL;
+ /* Find the 2 operands in the cache, if they are there. */
+ for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next)
+ if (USE_OP_PTR (ptr)->use == exp0)
+ {
+ use0 = ptr;
+ break;
+ }
- /* Now fill the clobbered cache with the values that have been found. */
- for (i = opbuild_first (&build_vuses);
- i != OPBUILD_LAST;
- i = opbuild_next (&build_vuses, i))
- VARRAY_PUSH_TREE (ro_call_vuses, opbuild_elem_virtual (&build_vuses, i));
+ for (ptr = gimple_use_ops (stmt); ptr; ptr = ptr->next)
+ if (USE_OP_PTR (ptr)->use == exp1)
+ {
+ use1 = ptr;
+ break;
+ }
- gcc_assert (opbuild_num_elems (&build_vuses)
- == VARRAY_ACTIVE_SIZE (ro_call_vuses));
+ /* If both uses don't have operand entries, there isn't much we can do
+ at this point. Presumably we don't need to worry about it. */
+ if (use0 && use1)
+ {
+ tree *tmp = USE_OP_PTR (use1)->use;
+ USE_OP_PTR (use1)->use = USE_OP_PTR (use0)->use;
+ USE_OP_PTR (use0)->use = tmp;
+ }
+ }
- ssa_ro_call_cache_valid = true;
+ /* Now swap the data. */
+ *exp0 = op1;
+ *exp1 = op0;
}
/* Scan the immediate_use list for VAR making sure its linked properly.
- return RTUE iof there is a problem. */
+ Return TRUE if there is a problem and emit an error message to F. */
bool
verify_imm_links (FILE *f, tree var)
{
if (prev != ptr->prev)
goto error;
-
+
if (ptr->use == NULL)
goto error; /* 2 roots, or SAFE guard node. */
else if (*(ptr->use) != var)
prev = ptr;
ptr = ptr->next;
- /* Avoid infinite loops. */
- if (count++ > 30000)
+
+ /* Avoid infinite loops. 50,000,000 uses probably indicates a
+ problem. */
+ if (count++ > 50000000)
goto error;
}
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 (!is_gimple_reg (USE_FROM_PTR (use_p)))
- print_generic_stmt (file, USE_STMT (use_p), TDF_VOPS);
+ if (use_p->loc.stmt == NULL && use_p->use == NULL)
+ fprintf (file, "***end of stmt iterator marker***\n");
else
- print_generic_stmt (file, USE_STMT (use_p), TDF_SLIM);
+ if (!is_gimple_reg (USE_FROM_PTR (use_p)))
+ print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_VOPS|TDF_MEMSYMS);
+ else
+ print_gimple_stmt (file, USE_STMT (use_p), 0, TDF_SLIM);
}
fprintf(file, "\n");
}
+
/* Dump all the immediate uses to FILE. */
void
dump_immediate_uses (stderr);
}
+
/* Dump def-use edges on stderr. */
void
{
dump_immediate_uses_for (stderr, var);
}
-#include "gt-tree-ssa-operands.h"
+
+
+/* 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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