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. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
#include "config.h"
#include "system.h"
#include "tm.h"
#include "tree.h"
#include "rtl.h"
-#include "errors.h"
#include "varray.h"
#include "tree-gimple.h"
#include "tree-inline.h"
#include "output.h"
#include "expr.h"
#include "ggc.h"
+#include "toplev.h"
#include "target.h"
static struct gimplify_ctx
tree conditional_cleanups;
tree exit_label;
tree return_temp;
- varray_type case_labels;
+ VEC(tree,heap) *case_labels;
/* The formal temporary table. Should this be persistent? */
htab_t temp_htab;
int conditions;
tsi_link_after (&i, t, TSI_CONTINUE_LINKING);
}
-/* Add T to the end of the list container pointed by LIST_P.
+/* Add T to the end of the list container pointed to by LIST_P.
If T is an expression with no effects, it is ignored. */
void
return lab;
}
+/* Subroutine for find_single_pointer_decl. */
+
+static tree
+find_single_pointer_decl_1 (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
+ void *data)
+{
+ tree *pdecl = (tree *) data;
+
+ if (DECL_P (*tp) && POINTER_TYPE_P (TREE_TYPE (*tp)))
+ {
+ if (*pdecl)
+ {
+ /* We already found a pointer decl; return anything other
+ than NULL_TREE to unwind from walk_tree signalling that
+ we have a duplicate. */
+ return *tp;
+ }
+ *pdecl = *tp;
+ }
+
+ return NULL_TREE;
+}
+
+/* Find the single DECL of pointer type in the tree T and return it.
+ If there are zero or more than one such DECLs, return NULL. */
+
+static tree
+find_single_pointer_decl (tree t)
+{
+ tree decl = NULL_TREE;
+
+ if (walk_tree (&t, find_single_pointer_decl_1, &decl, NULL))
+ {
+ /* find_single_pointer_decl_1 returns a non-zero value, causing
+ walk_tree to return a non-zero value, to indicate that it
+ found more than one pointer DECL. */
+ return NULL_TREE;
+ }
+
+ return decl;
+}
+
/* Create a new temporary name with PREFIX. Returns an identifier. */
static GTY(()) unsigned int tmp_var_id_num;
static inline tree
create_tmp_from_val (tree val)
{
- return create_tmp_var (TREE_TYPE (val), get_name (val));
+ return create_tmp_var (TYPE_MAIN_VARIANT (TREE_TYPE (val)), get_name (val));
}
/* Create a temporary to hold the value of VAL. If IS_FORMAL, try to reuse
t = lookup_tmp_var (val, is_formal);
+ if (is_formal)
+ {
+ tree u = find_single_pointer_decl (val);
+
+ if (u && TREE_CODE (u) == VAR_DECL && DECL_BASED_ON_RESTRICT_P (u))
+ u = DECL_GET_RESTRICT_BASE (u);
+ if (u && TYPE_RESTRICT (TREE_TYPE (u)))
+ {
+ if (DECL_BASED_ON_RESTRICT_P (t))
+ gcc_assert (u == DECL_GET_RESTRICT_BASE (t));
+ else
+ {
+ DECL_BASED_ON_RESTRICT_P (t) = 1;
+ SET_DECL_RESTRICT_BASE (t, u);
+ }
+ }
+ }
+
+ if (TREE_CODE (TREE_TYPE (t)) == COMPLEX_TYPE)
+ DECL_COMPLEX_GIMPLE_REG_P (t) = 1;
+
mod = build (MODIFY_EXPR, TREE_TYPE (t), t, val);
if (EXPR_HAS_LOCATION (val))
|| TREE_CODE_CLASS (code) == tcc_constant
|| code == SAVE_EXPR || code == TARGET_EXPR
/* We can't do anything sensible with a BLOCK used as an expression,
- but we also can't abort when we see it because of non-expression
+ but we also can't just die when we see it because of non-expression
uses. So just avert our eyes and cross our fingers. Silly Java. */
|| code == BLOCK)
*walk_subtrees = 0;
/* Mark variables seen in this bind expr. */
for (t = BIND_EXPR_VARS (bind_expr); t ; t = TREE_CHAIN (t))
- DECL_SEEN_IN_BIND_EXPR_P (t) = 1;
+ {
+ if (TREE_CODE (t) == VAR_DECL)
+ DECL_SEEN_IN_BIND_EXPR_P (t) = 1;
+
+ /* Preliminarily mark non-addressed complex variables as eligible
+ for promotion to gimple registers. We'll transform their uses
+ as we find them. */
+ if (TREE_CODE (TREE_TYPE (t)) == COMPLEX_TYPE
+ && !TREE_THIS_VOLATILE (t)
+ && (TREE_CODE (t) == VAR_DECL && !DECL_HARD_REGISTER (t))
+ && !needs_to_live_in_memory (t))
+ DECL_COMPLEX_GIMPLE_REG_P (t) = 1;
+ }
gimple_push_bind_expr (bind_expr);
gimplify_ctxp->save_stack = false;
returned in registers. If we're returning values in registers, then
we don't want to extend the lifetime of the RESULT_DECL, particularly
across another call. In addition, for those aggregates for which
- hard_function_value generates a PARALLEL, we'll abort during normal
+ hard_function_value generates a PARALLEL, we'll die during normal
expansion of structure assignments; there's special code in expand_return
to handle this case that does not exist in expand_expr. */
if (!result_decl
if (TREE_TYPE (decl) == error_mark_node)
return GS_ERROR;
- else if (TREE_CODE (decl) == TYPE_DECL)
+ if ((TREE_CODE (decl) == TYPE_DECL
+ || TREE_CODE (decl) == VAR_DECL)
+ && !TYPE_SIZES_GIMPLIFIED (TREE_TYPE (decl)))
gimplify_type_sizes (TREE_TYPE (decl), stmt_p);
- else if (TREE_CODE (decl) == VAR_DECL && !DECL_EXTERNAL (decl))
+ if (TREE_CODE (decl) == VAR_DECL && !DECL_EXTERNAL (decl))
{
tree init = DECL_INITIAL (decl);
of the emitted code: see mx_register_decls(). */
tree t, args, addr, ptr_type;
- /* ??? We really shouldn't need to gimplify the type of the variable
- since it already should have been done. But leave this here
- for now to avoid disrupting too many things at once. */
- if (!TYPE_SIZES_GIMPLIFIED (TREE_TYPE (decl)))
- gimplify_type_sizes (TREE_TYPE (decl), stmt_p);
-
gimplify_one_sizepos (&DECL_SIZE (decl), stmt_p);
gimplify_one_sizepos (&DECL_SIZE_UNIT (decl), stmt_p);
addr = create_tmp_var (ptr_type, get_name (decl));
DECL_IGNORED_P (addr) = 0;
t = build_fold_indirect_ref (addr);
- DECL_VALUE_EXPR (decl) = t;
+ SET_DECL_VALUE_EXPR (decl, t);
+ DECL_HAS_VALUE_EXPR_P (decl) = 1;
args = tree_cons (NULL, DECL_SIZE_UNIT (decl), NULL);
t = built_in_decls[BUILT_IN_ALLOCA];
if (SWITCH_BODY (switch_expr))
{
- varray_type labels, saved_labels;
+ VEC(tree,heap) *labels, *saved_labels;
tree label_vec, default_case = NULL_TREE;
size_t i, len;
gcc_assert (!SWITCH_LABELS (switch_expr));
saved_labels = gimplify_ctxp->case_labels;
- VARRAY_TREE_INIT (gimplify_ctxp->case_labels, 8, "case_labels");
+ gimplify_ctxp->case_labels = VEC_alloc (tree, heap, 8);
gimplify_to_stmt_list (&SWITCH_BODY (switch_expr));
labels = gimplify_ctxp->case_labels;
gimplify_ctxp->case_labels = saved_labels;
- len = VARRAY_ACTIVE_SIZE (labels);
+ len = VEC_length (tree, labels);
for (i = 0; i < len; ++i)
{
- tree t = VARRAY_TREE (labels, i);
+ tree t = VEC_index (tree, labels, i);
if (!CASE_LOW (t))
{
/* The default case must be the last label in the list. */
default_case = t;
- VARRAY_TREE (labels, i) = VARRAY_TREE (labels, len - 1);
+ VEC_replace (tree, labels, i, VEC_index (tree, labels, len - 1));
len--;
break;
}
*expr_p = SWITCH_BODY (switch_expr);
for (i = 0; i < len; ++i)
- TREE_VEC_ELT (label_vec, i) = VARRAY_TREE (labels, i);
+ TREE_VEC_ELT (label_vec, i) = VEC_index (tree, labels, i);
TREE_VEC_ELT (label_vec, len) = default_case;
+ VEC_free (tree, heap, labels);
+
sort_case_labels (label_vec);
SWITCH_BODY (switch_expr) = NULL;
tree expr = *expr_p;
gcc_assert (gimplify_ctxp->case_labels);
- VARRAY_PUSH_TREE (gimplify_ctxp->case_labels, expr);
+ VEC_safe_push (tree, heap, gimplify_ctxp->case_labels, expr);
*expr_p = build (LABEL_EXPR, void_type_node, CASE_LABEL (expr));
return GS_ALL_DONE;
}
return GS_OK;
}
+/* Gimplify a VAR_DECL or PARM_DECL. Returns GS_OK if we expanded a
+ DECL_VALUE_EXPR, and it's worth re-examining things. */
+
+static enum gimplify_status
+gimplify_var_or_parm_decl (tree *expr_p)
+{
+ tree decl = *expr_p;
+
+ /* ??? If this is a local variable, and it has not been seen in any
+ outer BIND_EXPR, then it's probably the result of a duplicate
+ declaration, for which we've already issued an error. It would
+ be really nice if the front end wouldn't leak these at all.
+ Currently the only known culprit is C++ destructors, as seen
+ in g++.old-deja/g++.jason/binding.C. */
+ if (TREE_CODE (decl) == VAR_DECL
+ && !DECL_SEEN_IN_BIND_EXPR_P (decl)
+ && !TREE_STATIC (decl) && !DECL_EXTERNAL (decl)
+ && decl_function_context (decl) == current_function_decl)
+ {
+ gcc_assert (errorcount || sorrycount);
+ return GS_ERROR;
+ }
+
+ /* If the decl is an alias for another expression, substitute it now. */
+ if (DECL_HAS_VALUE_EXPR_P (decl))
+ {
+ *expr_p = unshare_expr (DECL_VALUE_EXPR (decl));
+ return GS_OK;
+ }
+
+ return GS_ALL_DONE;
+}
+
+
/* Gimplify the COMPONENT_REF, ARRAY_REF, REALPART_EXPR or IMAGPART_EXPR
- node pointed by EXPR_P.
+ node pointed to by EXPR_P.
compound_lval
: min_lval '[' val ']'
tree *post_p, fallback_t fallback)
{
tree *p;
- varray_type stack;
+ VEC(tree,heap) *stack;
enum gimplify_status ret = GS_OK, tret;
int i;
/* Create a stack of the subexpressions so later we can walk them in
- order from inner to outer.
-
- This array is very memory consuming. Don't even think of making
- it VARRAY_TREE. */
- VARRAY_GENERIC_PTR_NOGC_INIT (stack, 10, "stack");
+ order from inner to outer. */
+ stack = VEC_alloc (tree, heap, 10);
/* We can handle anything that get_inner_reference can deal with. */
for (p = expr_p; ; p = &TREE_OPERAND (*p, 0))
{
+ restart:
/* Fold INDIRECT_REFs now to turn them into ARRAY_REFs. */
if (TREE_CODE (*p) == INDIRECT_REF)
*p = fold_indirect_ref (*p);
- if (!handled_component_p (*p))
+
+ if (handled_component_p (*p))
+ ;
+ /* Expand DECL_VALUE_EXPR now. In some cases that may expose
+ additional COMPONENT_REFs. */
+ else if ((TREE_CODE (*p) == VAR_DECL || TREE_CODE (*p) == PARM_DECL)
+ && gimplify_var_or_parm_decl (p) == GS_OK)
+ goto restart;
+ else
break;
- VARRAY_PUSH_GENERIC_PTR_NOGC (stack, *p);
+
+ VEC_safe_push (tree, heap, stack, *p);
}
- gcc_assert (VARRAY_ACTIVE_SIZE (stack));
+ gcc_assert (VEC_length (tree, stack));
/* Now STACK is a stack of pointers to all the refs we've walked through
and P points to the innermost expression.
So we do this in three steps. First we deal with the annotations
for any variables in the components, then we gimplify the base,
then we gimplify any indices, from left to right. */
- for (i = VARRAY_ACTIVE_SIZE (stack) - 1; i >= 0; i--)
+ for (i = VEC_length (tree, stack) - 1; i >= 0; i--)
{
- tree t = VARRAY_GENERIC_PTR_NOGC (stack, i);
+ tree t = VEC_index (tree, stack, i);
if (TREE_CODE (t) == ARRAY_REF || TREE_CODE (t) == ARRAY_RANGE_REF)
{
}
}
- /* Step 2 is to gimplify the base expression. */
- tret = gimplify_expr (p, pre_p, post_p, is_gimple_min_lval, fallback);
+ /* Step 2 is to gimplify the base expression. Make sure lvalue is set
+ so as to match the min_lval predicate. Failure to do so may result
+ in the creation of large aggregate temporaries. */
+ tret = gimplify_expr (p, pre_p, post_p, is_gimple_min_lval,
+ fallback | fb_lvalue);
ret = MIN (ret, tret);
/* And finally, the indices and operands to BIT_FIELD_REF. During this
loop we also remove any useless conversions. */
- for (; VARRAY_ACTIVE_SIZE (stack) > 0; )
+ for (; VEC_length (tree, stack) > 0; )
{
- tree t = VARRAY_TOP_TREE (stack);
+ tree t = VEC_pop (tree, stack);
if (TREE_CODE (t) == ARRAY_REF || TREE_CODE (t) == ARRAY_RANGE_REF)
{
set which would have caused all the outer expressions in EXPR_P
leading to P to also have had TREE_SIDE_EFFECTS set. */
recalculate_side_effects (t);
- VARRAY_POP (stack);
}
tret = gimplify_expr (p, pre_p, post_p, is_gimple_min_lval, fallback);
ret = MIN (ret, GS_OK);
}
- VARRAY_FREE (stack);
+ VEC_free (tree, heap, stack);
return ret;
}
-/* Gimplify the self modifying expression pointed by EXPR_P (++, --, +=, -=).
+/* Gimplify the self modifying expression pointed to by EXPR_P
+ (++, --, +=, -=).
PRE_P points to the list where side effects that must happen before
*EXPR_P should be stored.
return gimplify_expr (expr_p, pre_p, NULL, test, fb);
}
-/* Gimplify the CALL_EXPR node pointed by EXPR_P. PRE_P points to the
+/* Gimplify the CALL_EXPR node pointed to by EXPR_P. PRE_P points to the
list where side effects that must happen before *EXPR_P should be stored.
WANT_VALUE is true if the result of the call is desired. */
}
}
-/* Convert the conditional expression pointed by EXPR_P '(p) ? a : b;'
+/* Convert the conditional expression pointed to by EXPR_P '(p) ? a : b;'
into
if (p) if (p)
enum gimplify_status ret;
type = TREE_TYPE (expr);
- if (!type)
- TREE_TYPE (expr) = void_type_node;
/* If this COND_EXPR has a value, copy the values into a temporary within
the arms. */
- else if (! VOID_TYPE_P (type))
+ if (! VOID_TYPE_P (type))
{
tree result;
/* Recurse for nested constructors. */
if (TREE_CODE (*expr_p) == CONSTRUCTOR)
{
- tree list;
- for (list = CONSTRUCTOR_ELTS (*expr_p); list ; list = TREE_CHAIN (list))
- gimplify_init_ctor_preeval (&TREE_VALUE (list), pre_p, post_p, data);
+ unsigned HOST_WIDE_INT ix;
+ constructor_elt *ce;
+ VEC(constructor_elt,gc) *v = CONSTRUCTOR_ELTS (*expr_p);
+
+ for (ix = 0; VEC_iterate (constructor_elt, v, ix, ce); ix++)
+ gimplify_init_ctor_preeval (&ce->value, pre_p, post_p, data);
return;
}
Note that we never have to deal with SAVE_EXPRs here, because this has
already been taken care of for us, in gimplify_init_ctor_preeval(). */
-static void gimplify_init_ctor_eval (tree, tree, tree *, bool);
+static void gimplify_init_ctor_eval (tree, VEC(constructor_elt,gc) *,
+ tree *, bool);
static void
gimplify_init_ctor_eval_range (tree object, tree lower, tree upper,
pre_p);
}
+/* Return true if FDECL is accessing a field that is zero sized. */
+
+static bool
+zero_sized_field_decl (tree fdecl)
+{
+ if (TREE_CODE (fdecl) == FIELD_DECL && DECL_SIZE (fdecl)
+ && integer_zerop (DECL_SIZE (fdecl)))
+ return true;
+ return false;
+}
+
+/* Return true if TYPE is zero sized. */
+
+static bool
+zero_sized_type (tree type)
+{
+ if (AGGREGATE_TYPE_P (type) && TYPE_SIZE (type)
+ && integer_zerop (TYPE_SIZE (type)))
+ return true;
+ return false;
+}
+
/* A subroutine of gimplify_init_constructor. Generate individual
MODIFY_EXPRs for a CONSTRUCTOR. OBJECT is the LHS against which the
- assignments should happen. LIST is the CONSTRUCTOR_ELTS of the
+ assignments should happen. ELTS is the CONSTRUCTOR_ELTS of the
CONSTRUCTOR. CLEARED is true if the entire LHS object has been
zeroed first. */
static void
-gimplify_init_ctor_eval (tree object, tree list, tree *pre_p, bool cleared)
+gimplify_init_ctor_eval (tree object, VEC(constructor_elt,gc) *elts,
+ tree *pre_p, bool cleared)
{
tree array_elt_type = NULL;
+ unsigned HOST_WIDE_INT ix;
+ tree purpose, value;
if (TREE_CODE (TREE_TYPE (object)) == ARRAY_TYPE)
array_elt_type = TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (object)));
- for (; list; list = TREE_CHAIN (list))
+ FOR_EACH_CONSTRUCTOR_ELT (elts, ix, purpose, value)
{
- tree purpose, value, cref, init;
-
- purpose = TREE_PURPOSE (list);
- value = TREE_VALUE (list);
+ tree cref, init;
/* NULL values are created above for gimplification errors. */
if (value == NULL)
so we don't have to figure out what's missing ourselves. */
gcc_assert (purpose);
+ /* Skip zero-sized fields, unless value has side-effects. This can
+ happen with calls to functions returning a zero-sized type, which
+ we shouldn't discard. As a number of downstream passes don't
+ expect sets of zero-sized fields, we rely on the gimplification of
+ the MODIFY_EXPR we make below to drop the assignment statement. */
+ if (! TREE_SIDE_EFFECTS (value) && zero_sized_field_decl (purpose))
+ continue;
+
/* If we have a RANGE_EXPR, we have to build a loop to assign the
whole range. */
if (TREE_CODE (purpose) == RANGE_EXPR)
purpose, NULL_TREE, NULL_TREE);
}
else
- cref = build (COMPONENT_REF, TREE_TYPE (purpose),
- unshare_expr (object), purpose, NULL_TREE);
+ {
+ gcc_assert (TREE_CODE (purpose) == FIELD_DECL);
+ cref = build (COMPONENT_REF, TREE_TYPE (purpose),
+ unshare_expr (object), purpose, NULL_TREE);
+ }
- if (TREE_CODE (value) == CONSTRUCTOR)
+ if (TREE_CODE (value) == CONSTRUCTOR
+ && TREE_CODE (TREE_TYPE (value)) != VECTOR_TYPE)
gimplify_init_ctor_eval (cref, CONSTRUCTOR_ELTS (value),
pre_p, cleared);
else
tree ctor = TREE_OPERAND (*expr_p, 1);
tree type = TREE_TYPE (ctor);
enum gimplify_status ret;
- tree elt_list;
+ VEC(constructor_elt,gc) *elts;
if (TREE_CODE (ctor) != CONSTRUCTOR)
return GS_UNHANDLED;
return ret;
object = TREE_OPERAND (*expr_p, 0);
- elt_list = CONSTRUCTOR_ELTS (ctor);
+ elts = CONSTRUCTOR_ELTS (ctor);
ret = GS_ALL_DONE;
switch (TREE_CODE (type))
/* Aggregate types must lower constructors to initialization of
individual elements. The exception is that a CONSTRUCTOR node
with no elements indicates zero-initialization of the whole. */
- if (elt_list == NULL)
+ if (VEC_empty (constructor_elt, elts))
break;
categorize_ctor_elements (ctor, &num_nonzero_elements,
break;
}
+ /* If there are "lots" of initialized elements, even discounting
+ those that are not address constants (and thus *must* be
+ computed at runtime), then partition the constructor into
+ constant and non-constant parts. Block copy the constant
+ parts in, then generate code for the non-constant parts. */
+ /* TODO. There's code in cp/typeck.c to do this. */
+
+ num_type_elements = count_type_elements (type, true);
+
+ /* If count_type_elements could not determine number of type elements
+ for a constant-sized object, assume clearing is needed.
+ Don't do this for variable-sized objects, as store_constructor
+ will ignore the clearing of variable-sized objects. */
+ if (num_type_elements < 0 && int_size_in_bytes (type) >= 0)
+ cleared = true;
+ /* If there are "lots" of zeros, then block clear the object first. */
+ else if (num_type_elements - num_nonzero_elements > CLEAR_RATIO
+ && num_nonzero_elements < num_type_elements/4)
+ cleared = true;
+ /* ??? This bit ought not be needed. For any element not present
+ in the initializer, we should simply set them to zero. Except
+ we'd need to *find* the elements that are not present, and that
+ requires trickery to avoid quadratic compile-time behavior in
+ large cases or excessive memory use in small cases. */
+ else if (num_ctor_elements < num_type_elements)
+ cleared = true;
+
/* If there are "lots" of initialized elements, and all of them
are valid address constants, then the entire initializer can
- be dropped to memory, and then memcpy'd out. */
- if (num_nonconstant_elements == 0)
+ be dropped to memory, and then memcpy'd out. Don't do this
+ for sparse arrays, though, as it's more efficient to follow
+ the standard CONSTRUCTOR behavior of memset followed by
+ individual element initialization. */
+ if (num_nonconstant_elements == 0 && !cleared)
{
HOST_WIDE_INT size = int_size_in_bytes (type);
unsigned int align;
}
}
- /* If there are "lots" of initialized elements, even discounting
- those that are not address constants (and thus *must* be
- computed at runtime), then partition the constructor into
- constant and non-constant parts. Block copy the constant
- parts in, then generate code for the non-constant parts. */
- /* TODO. There's code in cp/typeck.c to do this. */
-
- num_type_elements = count_type_elements (TREE_TYPE (ctor));
-
- /* If there are "lots" of zeros, then block clear the object first. */
- if (num_type_elements - num_nonzero_elements > CLEAR_RATIO
- && num_nonzero_elements < num_type_elements/4)
- cleared = true;
-
- /* ??? This bit ought not be needed. For any element not present
- in the initializer, we should simply set them to zero. Except
- we'd need to *find* the elements that are not present, and that
- requires trickery to avoid quadratic compile-time behavior in
- large cases or excessive memory use in small cases. */
- else if (num_ctor_elements < num_type_elements)
- cleared = true;
-
if (cleared)
{
/* Zap the CONSTRUCTOR element list, which simplifies this case.
Note that we still have to gimplify, in order to handle the
case of variable sized types. Avoid shared tree structures. */
- CONSTRUCTOR_ELTS (ctor) = NULL_TREE;
+ CONSTRUCTOR_ELTS (ctor) = NULL;
object = unshare_expr (object);
gimplify_stmt (expr_p);
append_to_statement_list (*expr_p, pre_p);
gimplify_init_ctor_preeval (&TREE_OPERAND (*expr_p, 1),
pre_p, post_p, &preeval_data);
- gimplify_init_ctor_eval (object, elt_list, pre_p, cleared);
+ gimplify_init_ctor_eval (object, elts, pre_p, cleared);
}
*expr_p = NULL_TREE;
tree r, i;
/* Extract the real and imaginary parts out of the ctor. */
- r = i = NULL_TREE;
- if (elt_list)
- {
- r = TREE_VALUE (elt_list);
- elt_list = TREE_CHAIN (elt_list);
- if (elt_list)
- {
- i = TREE_VALUE (elt_list);
- gcc_assert (!TREE_CHAIN (elt_list));
- }
- }
+ gcc_assert (VEC_length (constructor_elt, elts) == 2);
+ r = VEC_index (constructor_elt, elts, 0)->value;
+ i = VEC_index (constructor_elt, elts, 1)->value;
if (r == NULL || i == NULL)
{
tree zero = convert (TREE_TYPE (type), integer_zero_node);
break;
case VECTOR_TYPE:
- /* Go ahead and simplify constant constructors to VECTOR_CST. */
- if (TREE_CONSTANT (ctor))
- {
- tree tem;
+ {
+ unsigned HOST_WIDE_INT ix;
+ constructor_elt *ce;
- /* Even when ctor is constant, it might contain non-*_CST
- elements (e.g. { 1.0/0.0 - 1.0/0.0, 0.0 }) and those don't
- belong into VECTOR_CST nodes. */
- for (tem = elt_list; tem; tem = TREE_CHAIN (tem))
- if (! CONSTANT_CLASS_P (TREE_VALUE (tem)))
- break;
+ /* Go ahead and simplify constant constructors to VECTOR_CST. */
+ if (TREE_CONSTANT (ctor))
+ {
+ bool constant_p = true;
+ tree value;
+
+ /* Even when ctor is constant, it might contain non-*_CST
+ elements (e.g. { 1.0/0.0 - 1.0/0.0, 0.0 }) and those don't
+ belong into VECTOR_CST nodes. */
+ FOR_EACH_CONSTRUCTOR_VALUE (elts, ix, value)
+ if (!CONSTANT_CLASS_P (value))
+ {
+ constant_p = false;
+ break;
+ }
- if (! tem)
- {
- TREE_OPERAND (*expr_p, 1) = build_vector (type, elt_list);
- break;
- }
- }
+ if (constant_p)
+ {
+ TREE_OPERAND (*expr_p, 1) = build_vector_from_ctor (type, elts);
+ break;
+ }
+ }
- /* Vector types use CONSTRUCTOR all the way through gimple
- compilation as a general initializer. */
- for (; elt_list; elt_list = TREE_CHAIN (elt_list))
- {
- enum gimplify_status tret;
- tret = gimplify_expr (&TREE_VALUE (elt_list), pre_p, post_p,
- is_gimple_val, fb_rvalue);
- if (tret == GS_ERROR)
- ret = GS_ERROR;
- }
+ /* Vector types use CONSTRUCTOR all the way through gimple
+ compilation as a general initializer. */
+ for (ix = 0; VEC_iterate (constructor_elt, elts, ix, ce); ix++)
+ {
+ enum gimplify_status tret;
+ tret = gimplify_expr (&ce->value, pre_p, post_p,
+ is_gimple_val, fb_rvalue);
+ if (tret == GS_ERROR)
+ ret = GS_ERROR;
+ }
+ }
break;
default:
return GS_ALL_DONE;
}
+/* Given a pointer value OP0, return a simplified version of an
+ indirection through OP0, or NULL_TREE if no simplification is
+ possible. This may only be applied to a rhs of an expression.
+ Note that the resulting type may be different from the type pointed
+ to in the sense that it is still compatible from the langhooks
+ point of view. */
+
+static tree
+fold_indirect_ref_rhs (tree t)
+{
+ tree type = TREE_TYPE (TREE_TYPE (t));
+ tree sub = t;
+ tree subtype;
+
+ STRIP_NOPS (sub);
+ subtype = TREE_TYPE (sub);
+ if (!POINTER_TYPE_P (subtype))
+ return NULL_TREE;
+
+ if (TREE_CODE (sub) == ADDR_EXPR)
+ {
+ tree op = TREE_OPERAND (sub, 0);
+ tree optype = TREE_TYPE (op);
+ /* *&p => p */
+ if (lang_hooks.types_compatible_p (type, optype))
+ return op;
+ /* *(foo *)&fooarray => fooarray[0] */
+ else if (TREE_CODE (optype) == ARRAY_TYPE
+ && lang_hooks.types_compatible_p (type, TREE_TYPE (optype)))
+ {
+ tree type_domain = TYPE_DOMAIN (optype);
+ tree min_val = size_zero_node;
+ if (type_domain && TYPE_MIN_VALUE (type_domain))
+ min_val = TYPE_MIN_VALUE (type_domain);
+ return build4 (ARRAY_REF, type, op, min_val, NULL_TREE, NULL_TREE);
+ }
+ }
+
+ /* *(foo *)fooarrptr => (*fooarrptr)[0] */
+ if (TREE_CODE (TREE_TYPE (subtype)) == ARRAY_TYPE
+ && lang_hooks.types_compatible_p (type, TREE_TYPE (TREE_TYPE (subtype))))
+ {
+ tree type_domain;
+ tree min_val = size_zero_node;
+ tree osub = sub;
+ sub = fold_indirect_ref_rhs (sub);
+ if (! sub)
+ sub = build1 (INDIRECT_REF, TREE_TYPE (subtype), osub);
+ type_domain = TYPE_DOMAIN (TREE_TYPE (sub));
+ if (type_domain && TYPE_MIN_VALUE (type_domain))
+ min_val = TYPE_MIN_VALUE (type_domain);
+ return build4 (ARRAY_REF, type, sub, min_val, NULL_TREE, NULL_TREE);
+ }
+
+ return NULL_TREE;
+}
+
/* Subroutine of gimplify_modify_expr to do simplifications of MODIFY_EXPRs
based on the code of the RHS. We loop for as long as something changes. */
This kind of code arises in C++ when an object is bound
to a const reference, and if "x" is a TARGET_EXPR we want
to take advantage of the optimization below. */
- tree t = fold_indirect_ref (*from_p);
- if (t != *from_p)
+ tree t = fold_indirect_ref_rhs (TREE_OPERAND (*from_p, 0));
+ if (t)
{
*from_p = t;
ret = GS_OK;
??? What about code that pulls out the temp and uses it
elsewhere? I think that such code never uses the TARGET_EXPR as
- an initializer. If I'm wrong, we'll abort because the temp won't
+ an initializer. If I'm wrong, we'll die because the temp won't
have any RTL. In that case, I guess we'll need to replace
references somehow. */
tree init = TARGET_EXPR_INITIAL (*from_p);
ret = GS_UNHANDLED;
break;
+ case CALL_EXPR:
+ /* For calls that return in memory, give *to_p as the CALL_EXPR's
+ return slot so that we don't generate a temporary. */
+ if (!CALL_EXPR_RETURN_SLOT_OPT (*from_p)
+ && aggregate_value_p (*from_p, *from_p))
+ {
+ bool use_target;
+
+ if (TREE_CODE (*to_p) == RESULT_DECL
+ && needs_to_live_in_memory (*to_p))
+ /* It's always OK to use the return slot directly. */
+ use_target = true;
+ else if (!is_gimple_non_addressable (*to_p))
+ /* Don't use the original target if it's already addressable;
+ if its address escapes, and the called function uses the
+ NRV optimization, a conforming program could see *to_p
+ change before the called function returns; see c++/19317.
+ When optimizing, the return_slot pass marks more functions
+ as safe after we have escape info. */
+ use_target = false;
+ else if (TREE_CODE (*to_p) != PARM_DECL
+ && DECL_GIMPLE_FORMAL_TEMP_P (*to_p))
+ /* Don't use the original target if it's a formal temp; we
+ don't want to take their addresses. */
+ use_target = false;
+ else if (is_gimple_reg_type (TREE_TYPE (*to_p)))
+ /* Also don't force regs into memory. */
+ use_target = false;
+ else
+ use_target = true;
+
+ if (use_target)
+ {
+ CALL_EXPR_RETURN_SLOT_OPT (*from_p) = 1;
+ lang_hooks.mark_addressable (*to_p);
+ }
+ }
+
+ ret = GS_UNHANDLED;
+ break;
+
default:
ret = GS_UNHANDLED;
break;
return ret;
}
-/* Gimplify the MODIFY_EXPR node pointed by EXPR_P.
+/* Promote partial stores to COMPLEX variables to total stores. *EXPR_P is
+ a MODIFY_EXPR with a lhs of a REAL/IMAGPART_EXPR of a variable with
+ DECL_COMPLEX_GIMPLE_REG_P set. */
+
+static enum gimplify_status
+gimplify_modify_expr_complex_part (tree *expr_p, tree *pre_p, bool want_value)
+{
+ enum tree_code code, ocode;
+ tree lhs, rhs, new_rhs, other, realpart, imagpart;
+
+ lhs = TREE_OPERAND (*expr_p, 0);
+ rhs = TREE_OPERAND (*expr_p, 1);
+ code = TREE_CODE (lhs);
+ lhs = TREE_OPERAND (lhs, 0);
+
+ ocode = code == REALPART_EXPR ? IMAGPART_EXPR : REALPART_EXPR;
+ other = build1 (ocode, TREE_TYPE (rhs), lhs);
+ other = get_formal_tmp_var (other, pre_p);
+
+ realpart = code == REALPART_EXPR ? rhs : other;
+ imagpart = code == REALPART_EXPR ? other : rhs;
+
+ if (TREE_CONSTANT (realpart) && TREE_CONSTANT (imagpart))
+ new_rhs = build_complex (TREE_TYPE (lhs), realpart, imagpart);
+ else
+ new_rhs = build2 (COMPLEX_EXPR, TREE_TYPE (lhs), realpart, imagpart);
+
+ TREE_OPERAND (*expr_p, 0) = lhs;
+ TREE_OPERAND (*expr_p, 1) = new_rhs;
+
+ if (want_value)
+ {
+ append_to_statement_list (*expr_p, pre_p);
+ *expr_p = rhs;
+ }
+
+ return GS_ALL_DONE;
+}
+
+/* Gimplify the MODIFY_EXPR node pointed to by EXPR_P.
modify_expr
: varname '=' rhs
/* The distinction between MODIFY_EXPR and INIT_EXPR is no longer useful. */
if (TREE_CODE (*expr_p) == INIT_EXPR)
TREE_SET_CODE (*expr_p, MODIFY_EXPR);
+
+ /* For zero sized types only gimplify the left hand side and right hand side
+ as statements and throw away the assignment. */
+ if (zero_sized_type (TREE_TYPE (*from_p)))
+ {
+ gimplify_stmt (from_p);
+ gimplify_stmt (to_p);
+ append_to_statement_list (*from_p, pre_p);
+ append_to_statement_list (*to_p, pre_p);
+ *expr_p = NULL_TREE;
+ return GS_ALL_DONE;
+ }
/* See if any simplifications can be done based on what the RHS is. */
ret = gimplify_modify_expr_rhs (expr_p, from_p, to_p, pre_p, post_p,
}
}
+ /* Transform partial stores to non-addressable complex variables into
+ total stores. This allows us to use real instead of virtual operands
+ for these variables, which improves optimization. */
+ if ((TREE_CODE (*to_p) == REALPART_EXPR
+ || TREE_CODE (*to_p) == IMAGPART_EXPR)
+ && is_gimple_reg (TREE_OPERAND (*to_p, 0)))
+ return gimplify_modify_expr_complex_part (expr_p, pre_p, want_value);
+
if (gimplify_ctxp->into_ssa && is_gimple_reg (*to_p))
{
/* If we've somehow already got an SSA_NAME on the LHS, then
- we're probably modifying it twice. Not good. */
+ we're probably modified it twice. Not good. */
gcc_assert (TREE_CODE (*to_p) != SSA_NAME);
*to_p = make_ssa_name (*to_p, *expr_p);
}
return ret;
}
-/* Re-write the ADDR_EXPR node pointed by EXPR_P
+/* Re-write the ADDR_EXPR node pointed to by EXPR_P
unary_expr
: ...
builtins like __builtin_va_end). */
/* Caution: the silent array decomposition semantics we allow for
ADDR_EXPR means we can't always discard the pair. */
+ /* Gimplification of the ADDR_EXPR operand may drop
+ cv-qualification conversions, so make sure we add them if
+ needed. */
{
tree op00 = TREE_OPERAND (op0, 0);
tree t_expr = TREE_TYPE (expr);
{
#ifdef ENABLE_CHECKING
tree t_op0 = TREE_TYPE (op0);
- gcc_assert (TREE_CODE (t_op0) == ARRAY_TYPE
- && POINTER_TYPE_P (t_expr)
- && cpt_same_type (TREE_TYPE (t_op0),
+ gcc_assert (POINTER_TYPE_P (t_expr)
+ && cpt_same_type (TREE_CODE (t_op0) == ARRAY_TYPE
+ ? TREE_TYPE (t_op0) : t_op0,
TREE_TYPE (t_expr))
&& POINTER_TYPE_P (t_op00)
&& cpt_same_type (t_op0, TREE_TYPE (t_op00)));
}
-/* Gimplifies the expression tree pointed by EXPR_P. Return 0 if
+/* Gimplifies the expression tree pointed to by EXPR_P. Return 0 if
gimplification failed.
PRE_P points to the list where side effects that must happen before
gimplify any element that has side-effects. */
if (fallback == fb_none)
{
- for (tmp = CONSTRUCTOR_ELTS (*expr_p); tmp;
- tmp = TREE_CHAIN (tmp))
- if (TREE_SIDE_EFFECTS (TREE_VALUE (tmp)))
- gimplify_expr (&TREE_VALUE (tmp), pre_p, post_p,
- gimple_test_f, fallback);
-
- *expr_p = NULL_TREE;
+ unsigned HOST_WIDE_INT ix;
+ constructor_elt *ce;
+ tree temp = NULL_TREE;
+ for (ix = 0;
+ VEC_iterate (constructor_elt, CONSTRUCTOR_ELTS (*expr_p),
+ ix, ce);
+ ix++)
+ if (TREE_SIDE_EFFECTS (ce->value))
+ append_to_statement_list (ce->value, &temp);
+
+ *expr_p = temp;
+ ret = GS_OK;
}
-
- ret = GS_ALL_DONE;
+ /* C99 code may assign to an array in a constructed
+ structure or union, and this has undefined behavior only
+ on execution, so create a temporary if an lvalue is
+ required. */
+ else if (fallback == fb_lvalue)
+ {
+ *expr_p = get_initialized_tmp_var (*expr_p, pre_p, post_p);
+ lang_hooks.mark_addressable (*expr_p);
+ }
+ else
+ ret = GS_ALL_DONE;
break;
/* The following are special cases that are not handled by the
break;
case VAR_DECL:
- /* ??? If this is a local variable, and it has not been seen in any
- outer BIND_EXPR, then it's probably the result of a duplicate
- declaration, for which we've already issued an error. It would
- be really nice if the front end wouldn't leak these at all.
- Currently the only known culprit is C++ destructors, as seen
- in g++.old-deja/g++.jason/binding.C. */
- tmp = *expr_p;
- if (!TREE_STATIC (tmp) && !DECL_EXTERNAL (tmp)
- && decl_function_context (tmp) == current_function_decl
- && !DECL_SEEN_IN_BIND_EXPR_P (tmp))
- {
- gcc_assert (errorcount || sorrycount);
- ret = GS_ERROR;
- break;
- }
- /* FALLTHRU */
-
case PARM_DECL:
- tmp = *expr_p;
-
- /* If this is a local variable sized decl, it must be accessed
- indirectly. Perform that substitution. */
- if (DECL_VALUE_EXPR (tmp))
- {
- *expr_p = unshare_expr (DECL_VALUE_EXPR (tmp));
- ret = GS_OK;
- break;
- }
-
- ret = GS_ALL_DONE;
+ ret = gimplify_var_or_parm_decl (expr_p);
break;
case SSA_NAME:
{
/* Historically, the compiler has treated a bare
reference to a volatile lvalue as forcing a load. */
- tree tmp = create_tmp_var (TREE_TYPE (*expr_p), "vol");
- *expr_p = build (MODIFY_EXPR, TREE_TYPE (tmp), tmp, *expr_p);
+ tree type = TYPE_MAIN_VARIANT (TREE_TYPE (*expr_p));
+ /* Normally, we do want to create a temporary for a
+ TREE_ADDRESSABLE type because such a type should not be
+ copied by bitwise-assignment. However, we make an
+ exception here, as all we are doing here is ensuring that
+ we read the bytes that make up the type. We use
+ create_tmp_var_raw because create_tmp_var will abort when
+ given a TREE_ADDRESSABLE type. */
+ tree tmp = create_tmp_var_raw (type, "vol");
+ gimple_add_tmp_var (tmp);
+ *expr_p = build (MODIFY_EXPR, type, tmp, *expr_p);
}
else
/* We can't do anything useful with a volatile reference to
#endif
gcc_assert (fallback & fb_mayfail);
/* If this is an asm statement, and the user asked for the
- impossible, don't abort. Fail and let gimplify_asm_expr
+ impossible, don't die. Fail and let gimplify_asm_expr
issue an error. */
ret = GS_ERROR;
goto out;
{
tree field, t;
- /* Note that we do not check for TYPE_SIZES_GIMPLIFIED already set because
- that's not supposed to happen on types where gimplification does anything.
- We should assert that it isn't set, but we can indeed be called multiple
- times on pointers. Unfortunately, this includes fat pointers which we
- can't easily test for. We could pass TYPE down to gimplify_one_sizepos
- and test there, but it doesn't seem worth it. */
+ if (type == NULL || type == error_mark_node)
+ return;
/* We first do the main variant, then copy into any other variants. */
type = TYPE_MAIN_VARIANT (type);
+ /* Avoid infinite recursion. */
+ if (TYPE_SIZES_GIMPLIFIED (type))
+ return;
+
+ TYPE_SIZES_GIMPLIFIED (type) = 1;
+
switch (TREE_CODE (type))
{
- case ERROR_MARK:
- return;
-
case INTEGER_TYPE:
case ENUMERAL_TYPE:
case BOOLEAN_TYPE:
{
TYPE_MIN_VALUE (t) = TYPE_MIN_VALUE (type);
TYPE_MAX_VALUE (t) = TYPE_MAX_VALUE (type);
- TYPE_SIZES_GIMPLIFIED (t) = 1;
}
break;
case ARRAY_TYPE:
/* These types may not have declarations, so handle them here. */
- if (!TYPE_SIZES_GIMPLIFIED (TREE_TYPE (type)))
- gimplify_type_sizes (TREE_TYPE (type), list_p);
-
- if (!TYPE_SIZES_GIMPLIFIED (TYPE_DOMAIN (type)))
- gimplify_type_sizes (TYPE_DOMAIN (type), list_p);
+ gimplify_type_sizes (TREE_TYPE (type), list_p);
+ gimplify_type_sizes (TYPE_DOMAIN (type), list_p);
break;
case RECORD_TYPE:
case QUAL_UNION_TYPE:
for (field = TYPE_FIELDS (type); field; field = TREE_CHAIN (field))
if (TREE_CODE (field) == FIELD_DECL)
- gimplify_one_sizepos (&DECL_FIELD_OFFSET (field), list_p);
+ {
+ gimplify_one_sizepos (&DECL_FIELD_OFFSET (field), list_p);
+ gimplify_type_sizes (TREE_TYPE (field), list_p);
+ }
+ break;
+
+ case POINTER_TYPE:
+ case REFERENCE_TYPE:
+ gimplify_type_sizes (TREE_TYPE (type), list_p);
break;
default:
TYPE_SIZE_UNIT (t) = TYPE_SIZE_UNIT (type);
TYPE_SIZES_GIMPLIFIED (t) = 1;
}
-
- TYPE_SIZES_GIMPLIFIED (type) = 1;
}
/* A subroutine of gimplify_type_sizes to make sure that *EXPR_P,
void
gimplify_one_sizepos (tree *expr_p, tree *stmt_p)
{
+ tree type, expr = *expr_p;
+
/* We don't do anything if the value isn't there, is constant, or contains
A PLACEHOLDER_EXPR. We also don't want to do anything if it's already
- a VAR_DECL. If it's a VAR_DECL from another function, the gimplfier
+ a VAR_DECL. If it's a VAR_DECL from another function, the gimplifier
will want to replace it with a new variable, but that will cause problems
if this type is from outside the function. It's OK to have that here. */
- if (*expr_p == NULL_TREE || TREE_CONSTANT (*expr_p)
- || TREE_CODE (*expr_p) == VAR_DECL
- || CONTAINS_PLACEHOLDER_P (*expr_p))
+ if (expr == NULL_TREE || TREE_CONSTANT (expr)
+ || TREE_CODE (expr) == VAR_DECL
+ || CONTAINS_PLACEHOLDER_P (expr))
return;
- *expr_p = unshare_expr (*expr_p);
+ type = TREE_TYPE (expr);
+ *expr_p = unshare_expr (expr);
+
gimplify_expr (expr_p, stmt_p, NULL, is_gimple_val, fb_rvalue);
+ expr = *expr_p;
+
+ /* Verify that we've an exact type match with the original expression.
+ In particular, we do not wish to drop a "sizetype" in favour of a
+ type of similar dimensions. We don't want to pollute the generic
+ type-stripping code with this knowledge because it doesn't matter
+ for the bulk of GENERIC/GIMPLE. It only matters that TYPE_SIZE_UNIT
+ and friends retain their "sizetype-ness". */
+ if (TREE_TYPE (expr) != type
+ && TREE_CODE (type) == INTEGER_TYPE
+ && TYPE_IS_SIZETYPE (type))
+ {
+ tree tmp;
+
+ *expr_p = create_tmp_var (type, NULL);
+ tmp = build1 (NOP_EXPR, type, expr);
+ tmp = build2 (MODIFY_EXPR, type, *expr_p, expr);
+ if (EXPR_HAS_LOCATION (expr))
+ SET_EXPR_LOCUS (tmp, EXPR_LOCUS (expr));
+ else
+ SET_EXPR_LOCATION (tmp, input_location);
+
+ gimplify_and_add (tmp, stmt_p);
+ }
}
\f
#ifdef ENABLE_CHECKING
}
#endif
-/* Gimplify the body of statements pointed by BODY_P. FNDECL is the
+/* Gimplify the body of statements pointed to by BODY_P. FNDECL is the
function decl containing BODY. */
void
void
gimplify_function_tree (tree fndecl)
{
- tree oldfn;
+ tree oldfn, parm, ret;
oldfn = current_function_decl;
current_function_decl = fndecl;
if (cfun == NULL)
allocate_struct_function (fndecl);
+ for (parm = DECL_ARGUMENTS (fndecl); parm ; parm = TREE_CHAIN (parm))
+ {
+ /* Preliminarily mark non-addressed complex variables as eligible
+ for promotion to gimple registers. We'll transform their uses
+ as we find them. */
+ if (TREE_CODE (TREE_TYPE (parm)) == COMPLEX_TYPE
+ && !TREE_THIS_VOLATILE (parm)
+ && !needs_to_live_in_memory (parm))
+ DECL_COMPLEX_GIMPLE_REG_P (parm) = 1;
+ }
+
+ ret = DECL_RESULT (fndecl);
+ if (TREE_CODE (TREE_TYPE (ret)) == COMPLEX_TYPE
+ && !needs_to_live_in_memory (ret))
+ DECL_COMPLEX_GIMPLE_REG_P (ret) = 1;
+
gimplify_body (&DECL_SAVED_TREE (fndecl), fndecl, true);
/* If we're instrumenting function entry/exit, then prepend the call to
gimple_test_f = simple ? is_gimple_val : is_gimple_reg_rhs;
push_gimplify_context ();
- gimplify_ctxp->into_ssa = true;
+ gimplify_ctxp->into_ssa = in_ssa_p;
if (var)
expr = build (MODIFY_EXPR, TREE_TYPE (var), var, expr);
gimple_test_f, fb_rvalue);
gcc_assert (ret != GS_ERROR);
- for (t = gimplify_ctxp->temps; t ; t = TREE_CHAIN (t))
- add_referenced_tmp_var (t);
+ if (referenced_vars)
+ {
+ for (t = gimplify_ctxp->temps; t ; t = TREE_CHAIN (t))
+ add_referenced_tmp_var (t);
+ }
pop_gimplify_context (NULL);
return expr;
}
+/* Invokes force_gimple_operand for EXPR with parameters SIMPLE_P and VAR. If
+ some statements are produced, emits them before BSI. */
+
+tree
+force_gimple_operand_bsi (block_stmt_iterator *bsi, tree expr,
+ bool simple_p, tree var)
+{
+ tree stmts;
+
+ expr = force_gimple_operand (expr, &stmts, simple_p, var);
+ if (stmts)
+ bsi_insert_before (bsi, stmts, BSI_SAME_STMT);
+
+ return expr;
+}
+
#include "gt-gimplify.h"
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