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authorBen Cheng <bccheng@google.com>2014-03-26 05:37:19 (GMT)
committerBen Cheng <bccheng@google.com>2014-03-26 05:37:19 (GMT)
commit1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch)
treec607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/gcc/ssa-iterators.h
parent283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff)
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Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
Diffstat (limited to 'gcc-4.9/gcc/ssa-iterators.h')
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diff --git a/gcc-4.9/gcc/ssa-iterators.h b/gcc-4.9/gcc/ssa-iterators.h
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+/* Header file for SSA iterators.
+ Copyright (C) 2013-2014 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 3, or (at your option) any later
+version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the 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 COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+#ifndef GCC_SSA_ITERATORS_H
+#define GCC_SSA_ITERATORS_H
+
+/* Immediate use lists are used to directly access all uses for an SSA
+ name and get pointers to the statement for each use.
+
+ The structure ssa_use_operand_t consists of PREV and NEXT pointers
+ to maintain the list. A USE pointer, which points to address where
+ the use is located and a LOC pointer which can point to the
+ statement where the use is located, or, in the case of the root
+ node, it points to the SSA name itself.
+
+ The list is anchored by an occurrence of ssa_operand_d *in* the
+ ssa_name node itself (named 'imm_uses'). This node is uniquely
+ identified by having a NULL USE pointer. and the LOC pointer
+ pointing back to the ssa_name node itself. This node forms the
+ base for a circular list, and initially this is the only node in
+ the list.
+
+ Fast iteration allows each use to be examined, but does not allow
+ any modifications to the uses or stmts.
+
+ Normal iteration allows insertion, deletion, and modification. the
+ iterator manages this by inserting a marker node into the list
+ immediately before the node currently being examined in the list.
+ this marker node is uniquely identified by having null stmt *and* a
+ null use pointer.
+
+ When iterating to the next use, the iteration routines check to see
+ if the node after the marker has changed. if it has, then the node
+ following the marker is now the next one to be visited. if not, the
+ marker node is moved past that node in the list (visualize it as
+ bumping the marker node through the list). this continues until
+ the marker node is moved to the original anchor position. the
+ marker node is then removed from the list.
+
+ If iteration is halted early, the marker node must be removed from
+ the list before continuing. */
+struct imm_use_iterator
+{
+ /* This is the current use the iterator is processing. */
+ ssa_use_operand_t *imm_use;
+ /* This marks the last use in the list (use node from SSA_NAME) */
+ ssa_use_operand_t *end_p;
+ /* This node is inserted and used to mark the end of the uses for a stmt. */
+ ssa_use_operand_t iter_node;
+ /* This is the next ssa_name to visit. IMM_USE may get removed before
+ the next one is traversed to, so it must be cached early. */
+ ssa_use_operand_t *next_imm_name;
+};
+
+
+/* Use this iterator when simply looking at stmts. Adding, deleting or
+ modifying stmts will cause this iterator to malfunction. */
+
+#define FOR_EACH_IMM_USE_FAST(DEST, ITER, SSAVAR) \
+ for ((DEST) = first_readonly_imm_use (&(ITER), (SSAVAR)); \
+ !end_readonly_imm_use_p (&(ITER)); \
+ (void) ((DEST) = next_readonly_imm_use (&(ITER))))
+
+/* Use this iterator to visit each stmt which has a use of SSAVAR. */
+
+#define FOR_EACH_IMM_USE_STMT(STMT, ITER, SSAVAR) \
+ for ((STMT) = first_imm_use_stmt (&(ITER), (SSAVAR)); \
+ !end_imm_use_stmt_p (&(ITER)); \
+ (void) ((STMT) = next_imm_use_stmt (&(ITER))))
+
+/* Use this to terminate the FOR_EACH_IMM_USE_STMT loop early. Failure to
+ do so will result in leaving a iterator marker node in the immediate
+ use list, and nothing good will come from that. */
+#define BREAK_FROM_IMM_USE_STMT(ITER) \
+ { \
+ end_imm_use_stmt_traverse (&(ITER)); \
+ break; \
+ }
+
+
+/* Use this iterator in combination with FOR_EACH_IMM_USE_STMT to
+ get access to each occurrence of ssavar on the stmt returned by
+ that iterator.. for instance:
+
+ FOR_EACH_IMM_USE_STMT (stmt, iter, ssavar)
+ {
+ FOR_EACH_IMM_USE_ON_STMT (use_p, iter)
+ {
+ SET_USE (use_p, blah);
+ }
+ update_stmt (stmt);
+ } */
+
+#define FOR_EACH_IMM_USE_ON_STMT(DEST, ITER) \
+ for ((DEST) = first_imm_use_on_stmt (&(ITER)); \
+ !end_imm_use_on_stmt_p (&(ITER)); \
+ (void) ((DEST) = next_imm_use_on_stmt (&(ITER))))
+
+
+
+extern bool has_zero_uses_1 (const ssa_use_operand_t *head);
+extern bool single_imm_use_1 (const ssa_use_operand_t *head,
+ use_operand_p *use_p, gimple *stmt);
+
+
+enum ssa_op_iter_type {
+ ssa_op_iter_none = 0,
+ ssa_op_iter_tree,
+ ssa_op_iter_use,
+ ssa_op_iter_def
+};
+
+/* This structure is used in the operand iterator loops. It contains the
+ items required to determine which operand is retrieved next. During
+ optimization, this structure is scalarized, and any unused fields are
+ optimized away, resulting in little overhead. */
+
+struct ssa_op_iter
+{
+ enum ssa_op_iter_type iter_type;
+ bool done;
+ int flags;
+ unsigned i;
+ unsigned numops;
+ use_optype_p uses;
+ gimple stmt;
+};
+
+/* NOTE: Keep these in sync with doc/tree-ssa.texi. */
+/* These flags are used to determine which operands are returned during
+ execution of the loop. */
+#define SSA_OP_USE 0x01 /* Real USE operands. */
+#define SSA_OP_DEF 0x02 /* Real DEF operands. */
+#define SSA_OP_VUSE 0x04 /* VUSE operands. */
+#define SSA_OP_VDEF 0x08 /* VDEF operands. */
+/* These are commonly grouped operand flags. */
+#define SSA_OP_VIRTUAL_USES (SSA_OP_VUSE)
+#define SSA_OP_VIRTUAL_DEFS (SSA_OP_VDEF)
+#define SSA_OP_ALL_VIRTUALS (SSA_OP_VIRTUAL_USES | SSA_OP_VIRTUAL_DEFS)
+#define SSA_OP_ALL_USES (SSA_OP_VIRTUAL_USES | SSA_OP_USE)
+#define SSA_OP_ALL_DEFS (SSA_OP_VIRTUAL_DEFS | SSA_OP_DEF)
+#define SSA_OP_ALL_OPERANDS (SSA_OP_ALL_USES | SSA_OP_ALL_DEFS)
+
+/* This macro executes a loop over the operands of STMT specified in FLAG,
+ returning each operand as a 'tree' in the variable TREEVAR. ITER is an
+ ssa_op_iter structure used to control the loop. */
+#define FOR_EACH_SSA_TREE_OPERAND(TREEVAR, STMT, ITER, FLAGS) \
+ for (TREEVAR = op_iter_init_tree (&(ITER), STMT, FLAGS); \
+ !op_iter_done (&(ITER)); \
+ (void) (TREEVAR = op_iter_next_tree (&(ITER))))
+
+/* This macro executes a loop over the operands of STMT specified in FLAG,
+ returning each operand as a 'use_operand_p' in the variable USEVAR.
+ ITER is an ssa_op_iter structure used to control the loop. */
+#define FOR_EACH_SSA_USE_OPERAND(USEVAR, STMT, ITER, FLAGS) \
+ for (USEVAR = op_iter_init_use (&(ITER), STMT, FLAGS); \
+ !op_iter_done (&(ITER)); \
+ USEVAR = op_iter_next_use (&(ITER)))
+
+/* This macro executes a loop over the operands of STMT specified in FLAG,
+ returning each operand as a 'def_operand_p' in the variable DEFVAR.
+ ITER is an ssa_op_iter structure used to control the loop. */
+#define FOR_EACH_SSA_DEF_OPERAND(DEFVAR, STMT, ITER, FLAGS) \
+ for (DEFVAR = op_iter_init_def (&(ITER), STMT, FLAGS); \
+ !op_iter_done (&(ITER)); \
+ DEFVAR = op_iter_next_def (&(ITER)))
+
+/* This macro will execute a loop over all the arguments of a PHI which
+ match FLAGS. A use_operand_p is always returned via USEVAR. FLAGS
+ can be either SSA_OP_USE or SSA_OP_VIRTUAL_USES or SSA_OP_ALL_USES. */
+#define FOR_EACH_PHI_ARG(USEVAR, STMT, ITER, FLAGS) \
+ for ((USEVAR) = op_iter_init_phiuse (&(ITER), STMT, FLAGS); \
+ !op_iter_done (&(ITER)); \
+ (USEVAR) = op_iter_next_use (&(ITER)))
+
+
+/* This macro will execute a loop over a stmt, regardless of whether it is
+ a real stmt or a PHI node, looking at the USE nodes matching FLAGS. */
+#define FOR_EACH_PHI_OR_STMT_USE(USEVAR, STMT, ITER, FLAGS) \
+ for ((USEVAR) = (gimple_code (STMT) == GIMPLE_PHI \
+ ? op_iter_init_phiuse (&(ITER), STMT, FLAGS) \
+ : op_iter_init_use (&(ITER), STMT, FLAGS)); \
+ !op_iter_done (&(ITER)); \
+ (USEVAR) = op_iter_next_use (&(ITER)))
+
+/* This macro will execute a loop over a stmt, regardless of whether it is
+ a real stmt or a PHI node, looking at the DEF nodes matching FLAGS. */
+#define FOR_EACH_PHI_OR_STMT_DEF(DEFVAR, STMT, ITER, FLAGS) \
+ for ((DEFVAR) = (gimple_code (STMT) == GIMPLE_PHI \
+ ? op_iter_init_phidef (&(ITER), STMT, FLAGS) \
+ : op_iter_init_def (&(ITER), STMT, FLAGS)); \
+ !op_iter_done (&(ITER)); \
+ (DEFVAR) = op_iter_next_def (&(ITER)))
+
+/* This macro returns an operand in STMT as a tree if it is the ONLY
+ operand matching FLAGS. If there are 0 or more than 1 operand matching
+ FLAGS, then NULL_TREE is returned. */
+#define SINGLE_SSA_TREE_OPERAND(STMT, FLAGS) \
+ single_ssa_tree_operand (STMT, FLAGS)
+
+/* This macro returns an operand in STMT as a use_operand_p if it is the ONLY
+ operand matching FLAGS. If there are 0 or more than 1 operand matching
+ FLAGS, then NULL_USE_OPERAND_P is returned. */
+#define SINGLE_SSA_USE_OPERAND(STMT, FLAGS) \
+ single_ssa_use_operand (STMT, FLAGS)
+
+/* This macro returns an operand in STMT as a def_operand_p if it is the ONLY
+ operand matching FLAGS. If there are 0 or more than 1 operand matching
+ FLAGS, then NULL_DEF_OPERAND_P is returned. */
+#define SINGLE_SSA_DEF_OPERAND(STMT, FLAGS) \
+ single_ssa_def_operand (STMT, FLAGS)
+
+/* This macro returns TRUE if there are no operands matching FLAGS in STMT. */
+#define ZERO_SSA_OPERANDS(STMT, FLAGS) zero_ssa_operands (STMT, FLAGS)
+
+/* This macro counts the number of operands in STMT matching FLAGS. */
+#define NUM_SSA_OPERANDS(STMT, FLAGS) num_ssa_operands (STMT, FLAGS)
+
+
+/* Delink an immediate_uses node from its chain. */
+static inline void
+delink_imm_use (ssa_use_operand_t *linknode)
+{
+ /* Return if this node is not in a list. */
+ if (linknode->prev == NULL)
+ return;
+
+ linknode->prev->next = linknode->next;
+ linknode->next->prev = linknode->prev;
+ linknode->prev = NULL;
+ linknode->next = NULL;
+}
+
+/* Link ssa_imm_use node LINKNODE into the chain for LIST. */
+static inline void
+link_imm_use_to_list (ssa_use_operand_t *linknode, ssa_use_operand_t *list)
+{
+ /* Link the new node at the head of the list. If we are in the process of
+ traversing the list, we won't visit any new nodes added to it. */
+ linknode->prev = list;
+ linknode->next = list->next;
+ list->next->prev = linknode;
+ list->next = linknode;
+}
+
+/* Link ssa_imm_use node LINKNODE into the chain for DEF. */
+static inline void
+link_imm_use (ssa_use_operand_t *linknode, tree def)
+{
+ ssa_use_operand_t *root;
+
+ if (!def || TREE_CODE (def) != SSA_NAME)
+ linknode->prev = NULL;
+ else
+ {
+ root = &(SSA_NAME_IMM_USE_NODE (def));
+ if (linknode->use)
+ gcc_checking_assert (*(linknode->use) == def);
+ link_imm_use_to_list (linknode, root);
+ }
+}
+
+/* Set the value of a use pointed to by USE to VAL. */
+static inline void
+set_ssa_use_from_ptr (use_operand_p use, tree val)
+{
+ delink_imm_use (use);
+ *(use->use) = val;
+ link_imm_use (use, val);
+}
+
+/* Link ssa_imm_use node LINKNODE into the chain for DEF, with use occurring
+ in STMT. */
+static inline void
+link_imm_use_stmt (ssa_use_operand_t *linknode, tree def, gimple stmt)
+{
+ if (stmt)
+ link_imm_use (linknode, def);
+ else
+ link_imm_use (linknode, NULL);
+ linknode->loc.stmt = stmt;
+}
+
+/* Relink a new node in place of an old node in the list. */
+static inline void
+relink_imm_use (ssa_use_operand_t *node, ssa_use_operand_t *old)
+{
+ /* The node one had better be in the same list. */
+ gcc_checking_assert (*(old->use) == *(node->use));
+ node->prev = old->prev;
+ node->next = old->next;
+ if (old->prev)
+ {
+ old->prev->next = node;
+ old->next->prev = node;
+ /* Remove the old node from the list. */
+ old->prev = NULL;
+ }
+}
+
+/* Relink ssa_imm_use node LINKNODE into the chain for OLD, with use occurring
+ in STMT. */
+static inline void
+relink_imm_use_stmt (ssa_use_operand_t *linknode, ssa_use_operand_t *old,
+ gimple stmt)
+{
+ if (stmt)
+ relink_imm_use (linknode, old);
+ else
+ link_imm_use (linknode, NULL);
+ linknode->loc.stmt = stmt;
+}
+
+
+/* Return true is IMM has reached the end of the immediate use list. */
+static inline bool
+end_readonly_imm_use_p (const imm_use_iterator *imm)
+{
+ return (imm->imm_use == imm->end_p);
+}
+
+/* Initialize iterator IMM to process the list for VAR. */
+static inline use_operand_p
+first_readonly_imm_use (imm_use_iterator *imm, tree var)
+{
+ imm->end_p = &(SSA_NAME_IMM_USE_NODE (var));
+ imm->imm_use = imm->end_p->next;
+#ifdef ENABLE_CHECKING
+ imm->iter_node.next = imm->imm_use->next;
+#endif
+ if (end_readonly_imm_use_p (imm))
+ return NULL_USE_OPERAND_P;
+ return imm->imm_use;
+}
+
+/* Bump IMM to the next use in the list. */
+static inline use_operand_p
+next_readonly_imm_use (imm_use_iterator *imm)
+{
+ use_operand_p old = imm->imm_use;
+
+#ifdef ENABLE_CHECKING
+ /* If this assertion fails, it indicates the 'next' pointer has changed
+ since the last bump. This indicates that the list is being modified
+ via stmt changes, or SET_USE, or somesuch thing, and you need to be
+ using the SAFE version of the iterator. */
+ gcc_assert (imm->iter_node.next == old->next);
+ imm->iter_node.next = old->next->next;
+#endif
+
+ imm->imm_use = old->next;
+ if (end_readonly_imm_use_p (imm))
+ return NULL_USE_OPERAND_P;
+ return imm->imm_use;
+}
+
+
+/* Return true if VAR has no nondebug uses. */
+static inline bool
+has_zero_uses (const_tree var)
+{
+ const ssa_use_operand_t *const ptr = &(SSA_NAME_IMM_USE_NODE (var));
+
+ /* A single use_operand means there is no items in the list. */
+ if (ptr == ptr->next)
+ return true;
+
+ /* If there are debug stmts, we have to look at each use and see
+ whether there are any nondebug uses. */
+ if (!MAY_HAVE_DEBUG_STMTS)
+ return false;
+
+ return has_zero_uses_1 (ptr);
+}
+
+/* Return true if VAR has a single nondebug use. */
+static inline bool
+has_single_use (const_tree var)
+{
+ const ssa_use_operand_t *const ptr = &(SSA_NAME_IMM_USE_NODE (var));
+
+ /* If there aren't any uses whatsoever, we're done. */
+ if (ptr == ptr->next)
+ return false;
+
+ /* If there's a single use, check that it's not a debug stmt. */
+ if (ptr == ptr->next->next)
+ return !is_gimple_debug (USE_STMT (ptr->next));
+
+ /* If there are debug stmts, we have to look at each of them. */
+ if (!MAY_HAVE_DEBUG_STMTS)
+ return false;
+
+ return single_imm_use_1 (ptr, NULL, NULL);
+}
+
+
+/* If VAR has only a single immediate nondebug use, return true, and
+ set USE_P and STMT to the use pointer and stmt of occurrence. */
+static inline bool
+single_imm_use (const_tree var, use_operand_p *use_p, gimple *stmt)
+{
+ const ssa_use_operand_t *const ptr = &(SSA_NAME_IMM_USE_NODE (var));
+
+ /* If there aren't any uses whatsoever, we're done. */
+ if (ptr == ptr->next)
+ {
+ return_false:
+ *use_p = NULL_USE_OPERAND_P;
+ *stmt = NULL;
+ return false;
+ }
+
+ /* If there's a single use, check that it's not a debug stmt. */
+ if (ptr == ptr->next->next)
+ {
+ if (!is_gimple_debug (USE_STMT (ptr->next)))
+ {
+ *use_p = ptr->next;
+ *stmt = ptr->next->loc.stmt;
+ return true;
+ }
+ else
+ goto return_false;
+ }
+
+ /* If there are debug stmts, we have to look at each of them. */
+ if (!MAY_HAVE_DEBUG_STMTS)
+ goto return_false;
+
+ return single_imm_use_1 (ptr, use_p, stmt);
+}
+
+/* Return the number of nondebug immediate uses of VAR. */
+static inline unsigned int
+num_imm_uses (const_tree var)
+{
+ const ssa_use_operand_t *const start = &(SSA_NAME_IMM_USE_NODE (var));
+ const ssa_use_operand_t *ptr;
+ unsigned int num = 0;
+
+ if (!MAY_HAVE_DEBUG_STMTS)
+ for (ptr = start->next; ptr != start; ptr = ptr->next)
+ num++;
+ else
+ for (ptr = start->next; ptr != start; ptr = ptr->next)
+ if (!is_gimple_debug (USE_STMT (ptr)))
+ num++;
+
+ return num;
+}
+
+/* ----------------------------------------------------------------------- */
+
+/* The following set of routines are used to iterator over various type of
+ SSA operands. */
+
+/* Return true if PTR is finished iterating. */
+static inline bool
+op_iter_done (const ssa_op_iter *ptr)
+{
+ return ptr->done;
+}
+
+/* Get the next iterator use value for PTR. */
+static inline use_operand_p
+op_iter_next_use (ssa_op_iter *ptr)
+{
+ use_operand_p use_p;
+ gcc_checking_assert (ptr->iter_type == ssa_op_iter_use);
+ if (ptr->uses)
+ {
+ use_p = USE_OP_PTR (ptr->uses);
+ ptr->uses = ptr->uses->next;
+ return use_p;
+ }
+ if (ptr->i < ptr->numops)
+ {
+ return PHI_ARG_DEF_PTR (ptr->stmt, (ptr->i)++);
+ }
+ ptr->done = true;
+ return NULL_USE_OPERAND_P;
+}
+
+/* Get the next iterator def value for PTR. */
+static inline def_operand_p
+op_iter_next_def (ssa_op_iter *ptr)
+{
+ gcc_checking_assert (ptr->iter_type == ssa_op_iter_def);
+ if (ptr->flags & SSA_OP_VDEF)
+ {
+ tree *p;
+ ptr->flags &= ~SSA_OP_VDEF;
+ p = gimple_vdef_ptr (ptr->stmt);
+ if (p && *p)
+ return p;
+ }
+ if (ptr->flags & SSA_OP_DEF)
+ {
+ while (ptr->i < ptr->numops)
+ {
+ tree *val = gimple_op_ptr (ptr->stmt, ptr->i);
+ ptr->i++;
+ if (*val)
+ {
+ if (TREE_CODE (*val) == TREE_LIST)
+ val = &TREE_VALUE (*val);
+ if (TREE_CODE (*val) == SSA_NAME
+ || is_gimple_reg (*val))
+ return val;
+ }
+ }
+ ptr->flags &= ~SSA_OP_DEF;
+ }
+
+ ptr->done = true;
+ return NULL_DEF_OPERAND_P;
+}
+
+/* Get the next iterator tree value for PTR. */
+static inline tree
+op_iter_next_tree (ssa_op_iter *ptr)
+{
+ tree val;
+ gcc_checking_assert (ptr->iter_type == ssa_op_iter_tree);
+ if (ptr->uses)
+ {
+ val = USE_OP (ptr->uses);
+ ptr->uses = ptr->uses->next;
+ return val;
+ }
+ if (ptr->flags & SSA_OP_VDEF)
+ {
+ ptr->flags &= ~SSA_OP_VDEF;
+ if ((val = gimple_vdef (ptr->stmt)))
+ return val;
+ }
+ if (ptr->flags & SSA_OP_DEF)
+ {
+ while (ptr->i < ptr->numops)
+ {
+ val = gimple_op (ptr->stmt, ptr->i);
+ ptr->i++;
+ if (val)
+ {
+ if (TREE_CODE (val) == TREE_LIST)
+ val = TREE_VALUE (val);
+ if (TREE_CODE (val) == SSA_NAME
+ || is_gimple_reg (val))
+ return val;
+ }
+ }
+ ptr->flags &= ~SSA_OP_DEF;
+ }
+
+ ptr->done = true;
+ return NULL_TREE;
+}
+
+
+/* This functions clears the iterator PTR, and marks it done. This is normally
+ used to prevent warnings in the compile about might be uninitialized
+ components. */
+
+static inline void
+clear_and_done_ssa_iter (ssa_op_iter *ptr)
+{
+ ptr->i = 0;
+ ptr->numops = 0;
+ ptr->uses = NULL;
+ ptr->iter_type = ssa_op_iter_none;
+ ptr->stmt = NULL;
+ ptr->done = true;
+ ptr->flags = 0;
+}
+
+/* Initialize the iterator PTR to the virtual defs in STMT. */
+static inline void
+op_iter_init (ssa_op_iter *ptr, gimple stmt, int flags)
+{
+ /* PHI nodes require a different iterator initialization path. We
+ do not support iterating over virtual defs or uses without
+ iterating over defs or uses at the same time. */
+ gcc_checking_assert (gimple_code (stmt) != GIMPLE_PHI
+ && (!(flags & SSA_OP_VDEF) || (flags & SSA_OP_DEF))
+ && (!(flags & SSA_OP_VUSE) || (flags & SSA_OP_USE)));
+ ptr->numops = 0;
+ if (flags & (SSA_OP_DEF | SSA_OP_VDEF))
+ {
+ switch (gimple_code (stmt))
+ {
+ case GIMPLE_ASSIGN:
+ case GIMPLE_CALL:
+ ptr->numops = 1;
+ break;
+ case GIMPLE_ASM:
+ ptr->numops = gimple_asm_noutputs (stmt);
+ break;
+ default:
+ ptr->numops = 0;
+ flags &= ~(SSA_OP_DEF | SSA_OP_VDEF);
+ break;
+ }
+ }
+ ptr->uses = (flags & (SSA_OP_USE|SSA_OP_VUSE)) ? gimple_use_ops (stmt) : NULL;
+ if (!(flags & SSA_OP_VUSE)
+ && ptr->uses
+ && gimple_vuse (stmt) != NULL_TREE)
+ ptr->uses = ptr->uses->next;
+ ptr->done = false;
+ ptr->i = 0;
+
+ ptr->stmt = stmt;
+ ptr->flags = flags;
+}
+
+/* Initialize iterator PTR to the use operands in STMT based on FLAGS. Return
+ the first use. */
+static inline use_operand_p
+op_iter_init_use (ssa_op_iter *ptr, gimple stmt, int flags)
+{
+ gcc_checking_assert ((flags & SSA_OP_ALL_DEFS) == 0
+ && (flags & SSA_OP_USE));
+ op_iter_init (ptr, stmt, flags);
+ ptr->iter_type = ssa_op_iter_use;
+ return op_iter_next_use (ptr);
+}
+
+/* Initialize iterator PTR to the def operands in STMT based on FLAGS. Return
+ the first def. */
+static inline def_operand_p
+op_iter_init_def (ssa_op_iter *ptr, gimple stmt, int flags)
+{
+ gcc_checking_assert ((flags & SSA_OP_ALL_USES) == 0
+ && (flags & SSA_OP_DEF));
+ op_iter_init (ptr, stmt, flags);
+ ptr->iter_type = ssa_op_iter_def;
+ return op_iter_next_def (ptr);
+}
+
+/* Initialize iterator PTR to the operands in STMT based on FLAGS. Return
+ the first operand as a tree. */
+static inline tree
+op_iter_init_tree (ssa_op_iter *ptr, gimple stmt, int flags)
+{
+ op_iter_init (ptr, stmt, flags);
+ ptr->iter_type = ssa_op_iter_tree;
+ return op_iter_next_tree (ptr);
+}
+
+
+/* If there is a single operand in STMT matching FLAGS, return it. Otherwise
+ return NULL. */
+static inline tree
+single_ssa_tree_operand (gimple stmt, int flags)
+{
+ tree var;
+ ssa_op_iter iter;
+
+ var = op_iter_init_tree (&iter, stmt, flags);
+ if (op_iter_done (&iter))
+ return NULL_TREE;
+ op_iter_next_tree (&iter);
+ if (op_iter_done (&iter))
+ return var;
+ return NULL_TREE;
+}
+
+
+/* If there is a single operand in STMT matching FLAGS, return it. Otherwise
+ return NULL. */
+static inline use_operand_p
+single_ssa_use_operand (gimple stmt, int flags)
+{
+ use_operand_p var;
+ ssa_op_iter iter;
+
+ var = op_iter_init_use (&iter, stmt, flags);
+ if (op_iter_done (&iter))
+ return NULL_USE_OPERAND_P;
+ op_iter_next_use (&iter);
+ if (op_iter_done (&iter))
+ return var;
+ return NULL_USE_OPERAND_P;
+}
+
+
+
+/* If there is a single operand in STMT matching FLAGS, return it. Otherwise
+ return NULL. */
+static inline def_operand_p
+single_ssa_def_operand (gimple stmt, int flags)
+{
+ def_operand_p var;
+ ssa_op_iter iter;
+
+ var = op_iter_init_def (&iter, stmt, flags);
+ if (op_iter_done (&iter))
+ return NULL_DEF_OPERAND_P;
+ op_iter_next_def (&iter);
+ if (op_iter_done (&iter))
+ return var;
+ return NULL_DEF_OPERAND_P;
+}
+
+
+/* Return true if there are zero operands in STMT matching the type
+ given in FLAGS. */
+static inline bool
+zero_ssa_operands (gimple stmt, int flags)
+{
+ ssa_op_iter iter;
+
+ op_iter_init_tree (&iter, stmt, flags);
+ return op_iter_done (&iter);
+}
+
+
+/* Return the number of operands matching FLAGS in STMT. */
+static inline int
+num_ssa_operands (gimple stmt, int flags)
+{
+ ssa_op_iter iter;
+ tree t;
+ int num = 0;
+
+ gcc_checking_assert (gimple_code (stmt) != GIMPLE_PHI);
+ FOR_EACH_SSA_TREE_OPERAND (t, stmt, iter, flags)
+ num++;
+ return num;
+}
+
+/* If there is a single DEF in the PHI node which matches FLAG, return it.
+ Otherwise return NULL_DEF_OPERAND_P. */
+static inline tree
+single_phi_def (gimple stmt, int flags)
+{
+ tree def = PHI_RESULT (stmt);
+ if ((flags & SSA_OP_DEF) && is_gimple_reg (def))
+ return def;
+ if ((flags & SSA_OP_VIRTUAL_DEFS) && !is_gimple_reg (def))
+ return def;
+ return NULL_TREE;
+}
+
+/* Initialize the iterator PTR for uses matching FLAGS in PHI. FLAGS should
+ be either SSA_OP_USES or SSA_OP_VIRTUAL_USES. */
+static inline use_operand_p
+op_iter_init_phiuse (ssa_op_iter *ptr, gimple phi, int flags)
+{
+ tree phi_def = gimple_phi_result (phi);
+ int comp;
+
+ clear_and_done_ssa_iter (ptr);
+ ptr->done = false;
+
+ gcc_checking_assert ((flags & (SSA_OP_USE | SSA_OP_VIRTUAL_USES)) != 0);
+
+ comp = (is_gimple_reg (phi_def) ? SSA_OP_USE : SSA_OP_VIRTUAL_USES);
+
+ /* If the PHI node doesn't the operand type we care about, we're done. */
+ if ((flags & comp) == 0)
+ {
+ ptr->done = true;
+ return NULL_USE_OPERAND_P;
+ }
+
+ ptr->stmt = phi;
+ ptr->numops = gimple_phi_num_args (phi);
+ ptr->iter_type = ssa_op_iter_use;
+ ptr->flags = flags;
+ return op_iter_next_use (ptr);
+}
+
+
+/* Start an iterator for a PHI definition. */
+
+static inline def_operand_p
+op_iter_init_phidef (ssa_op_iter *ptr, gimple phi, int flags)
+{
+ tree phi_def = PHI_RESULT (phi);
+ int comp;
+
+ clear_and_done_ssa_iter (ptr);
+ ptr->done = false;
+
+ gcc_checking_assert ((flags & (SSA_OP_DEF | SSA_OP_VIRTUAL_DEFS)) != 0);
+
+ comp = (is_gimple_reg (phi_def) ? SSA_OP_DEF : SSA_OP_VIRTUAL_DEFS);
+
+ /* If the PHI node doesn't have the operand type we care about,
+ we're done. */
+ if ((flags & comp) == 0)
+ {
+ ptr->done = true;
+ return NULL_DEF_OPERAND_P;
+ }
+
+ ptr->iter_type = ssa_op_iter_def;
+ /* The first call to op_iter_next_def will terminate the iterator since
+ all the fields are NULL. Simply return the result here as the first and
+ therefore only result. */
+ return PHI_RESULT_PTR (phi);
+}
+
+/* Return true is IMM has reached the end of the immediate use stmt list. */
+
+static inline bool
+end_imm_use_stmt_p (const imm_use_iterator *imm)
+{
+ return (imm->imm_use == imm->end_p);
+}
+
+/* Finished the traverse of an immediate use stmt list IMM by removing the
+ placeholder node from the list. */
+
+static inline void
+end_imm_use_stmt_traverse (imm_use_iterator *imm)
+{
+ delink_imm_use (&(imm->iter_node));
+}
+
+/* Immediate use traversal of uses within a stmt require that all the
+ uses on a stmt be sequentially listed. This routine is used to build up
+ this sequential list by adding USE_P to the end of the current list
+ currently delimited by HEAD and LAST_P. The new LAST_P value is
+ returned. */
+
+static inline use_operand_p
+move_use_after_head (use_operand_p use_p, use_operand_p head,
+ use_operand_p last_p)
+{
+ gcc_checking_assert (USE_FROM_PTR (use_p) == USE_FROM_PTR (head));
+ /* Skip head when we find it. */
+ if (use_p != head)
+ {
+ /* If use_p is already linked in after last_p, continue. */
+ if (last_p->next == use_p)
+ last_p = use_p;
+ else
+ {
+ /* Delink from current location, and link in at last_p. */
+ delink_imm_use (use_p);
+ link_imm_use_to_list (use_p, last_p);
+ last_p = use_p;
+ }
+ }
+ return last_p;
+}
+
+
+/* This routine will relink all uses with the same stmt as HEAD into the list
+ immediately following HEAD for iterator IMM. */
+
+static inline void
+link_use_stmts_after (use_operand_p head, imm_use_iterator *imm)
+{
+ use_operand_p use_p;
+ use_operand_p last_p = head;
+ gimple head_stmt = USE_STMT (head);
+ tree use = USE_FROM_PTR (head);
+ ssa_op_iter op_iter;
+ int flag;
+
+ /* Only look at virtual or real uses, depending on the type of HEAD. */
+ flag = (is_gimple_reg (use) ? SSA_OP_USE : SSA_OP_VIRTUAL_USES);
+
+ if (gimple_code (head_stmt) == GIMPLE_PHI)
+ {
+ FOR_EACH_PHI_ARG (use_p, head_stmt, op_iter, flag)
+ if (USE_FROM_PTR (use_p) == use)
+ last_p = move_use_after_head (use_p, head, last_p);
+ }
+ else
+ {
+ if (flag == SSA_OP_USE)
+ {
+ FOR_EACH_SSA_USE_OPERAND (use_p, head_stmt, op_iter, flag)
+ if (USE_FROM_PTR (use_p) == use)
+ last_p = move_use_after_head (use_p, head, last_p);
+ }
+ else if ((use_p = gimple_vuse_op (head_stmt)) != NULL_USE_OPERAND_P)
+ {
+ if (USE_FROM_PTR (use_p) == use)
+ last_p = move_use_after_head (use_p, head, last_p);
+ }
+ }
+ /* Link iter node in after last_p. */
+ if (imm->iter_node.prev != NULL)
+ delink_imm_use (&imm->iter_node);
+ link_imm_use_to_list (&(imm->iter_node), last_p);
+}
+
+/* Initialize IMM to traverse over uses of VAR. Return the first statement. */
+static inline gimple
+first_imm_use_stmt (imm_use_iterator *imm, tree var)
+{
+ imm->end_p = &(SSA_NAME_IMM_USE_NODE (var));
+ imm->imm_use = imm->end_p->next;
+ imm->next_imm_name = NULL_USE_OPERAND_P;
+
+ /* iter_node is used as a marker within the immediate use list to indicate
+ where the end of the current stmt's uses are. Initialize it to NULL
+ stmt and use, which indicates a marker node. */
+ imm->iter_node.prev = NULL_USE_OPERAND_P;
+ imm->iter_node.next = NULL_USE_OPERAND_P;
+ imm->iter_node.loc.stmt = NULL;
+ imm->iter_node.use = NULL;
+
+ if (end_imm_use_stmt_p (imm))
+ return NULL;
+
+ link_use_stmts_after (imm->imm_use, imm);
+
+ return USE_STMT (imm->imm_use);
+}
+
+/* Bump IMM to the next stmt which has a use of var. */
+
+static inline gimple
+next_imm_use_stmt (imm_use_iterator *imm)
+{
+ imm->imm_use = imm->iter_node.next;
+ if (end_imm_use_stmt_p (imm))
+ {
+ if (imm->iter_node.prev != NULL)
+ delink_imm_use (&imm->iter_node);
+ return NULL;
+ }
+
+ link_use_stmts_after (imm->imm_use, imm);
+ return USE_STMT (imm->imm_use);
+}
+
+/* This routine will return the first use on the stmt IMM currently refers
+ to. */
+
+static inline use_operand_p
+first_imm_use_on_stmt (imm_use_iterator *imm)
+{
+ imm->next_imm_name = imm->imm_use->next;
+ return imm->imm_use;
+}
+
+/* Return TRUE if the last use on the stmt IMM refers to has been visited. */
+
+static inline bool
+end_imm_use_on_stmt_p (const imm_use_iterator *imm)
+{
+ return (imm->imm_use == &(imm->iter_node));
+}
+
+/* Bump to the next use on the stmt IMM refers to, return NULL if done. */
+
+static inline use_operand_p
+next_imm_use_on_stmt (imm_use_iterator *imm)
+{
+ imm->imm_use = imm->next_imm_name;
+ if (end_imm_use_on_stmt_p (imm))
+ return NULL_USE_OPERAND_P;
+ else
+ {
+ imm->next_imm_name = imm->imm_use->next;
+ return imm->imm_use;
+ }
+}
+
+/* Delink all immediate_use information for STMT. */
+static inline void
+delink_stmt_imm_use (gimple stmt)
+{
+ ssa_op_iter iter;
+ use_operand_p use_p;
+
+ if (ssa_operands_active (cfun))
+ FOR_EACH_PHI_OR_STMT_USE (use_p, stmt, iter, SSA_OP_ALL_USES)
+ delink_imm_use (use_p);
+}
+
+#endif /* GCC_TREE_SSA_ITERATORS_H */