blob: 63abda3a9df0e8983f9096333b865c3a56460fed [file] [log] [blame]
/* Tree lowering pass. This pass converts the GENERIC functions-as-trees
tree representation into the GIMPLE form.
Copyright (C) 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
Major work done by Sebastian Pop <s.pop@laposte.net>,
Diego Novillo <dnovillo@redhat.com> and Jason Merrill <jason@redhat.com>.
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) 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 COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA. */
#include "config.h"
#include "system.h"
#include "coretypes.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 "diagnostic.h"
#include "langhooks.h"
#include "langhooks-def.h"
#include "tree-flow.h"
#include "cgraph.h"
#include "timevar.h"
#include "except.h"
#include "hashtab.h"
#include "flags.h"
#include "real.h"
#include "function.h"
#include "output.h"
#include "expr.h"
#include "ggc.h"
#include "target.h"
static struct gimplify_ctx
{
tree current_bind_expr;
tree temps;
tree conditional_cleanups;
tree exit_label;
tree return_temp;
varray_type case_labels;
/* The formal temporary table. Should this be persistent? */
htab_t temp_htab;
int conditions;
bool save_stack;
bool into_ssa;
} *gimplify_ctxp;
/* Formal (expression) temporary table handling: Multiple occurrences of
the same scalar expression are evaluated into the same temporary. */
typedef struct gimple_temp_hash_elt
{
tree val; /* Key */
tree temp; /* Value */
} elt_t;
/* Forward declarations. */
static enum gimplify_status gimplify_compound_expr (tree *, tree *, bool);
#ifdef ENABLE_CHECKING
static bool cpt_same_type (tree a, tree b);
#endif
/* Return a hash value for a formal temporary table entry. */
static hashval_t
gimple_tree_hash (const void *p)
{
tree t = ((const elt_t *) p)->val;
return iterative_hash_expr (t, 0);
}
/* Compare two formal temporary table entries. */
static int
gimple_tree_eq (const void *p1, const void *p2)
{
tree t1 = ((const elt_t *) p1)->val;
tree t2 = ((const elt_t *) p2)->val;
enum tree_code code = TREE_CODE (t1);
if (TREE_CODE (t2) != code
|| TREE_TYPE (t1) != TREE_TYPE (t2))
return 0;
if (!operand_equal_p (t1, t2, 0))
return 0;
/* Only allow them to compare equal if they also hash equal; otherwise
results are nondeterminate, and we fail bootstrap comparison. */
gcc_assert (gimple_tree_hash (p1) == gimple_tree_hash (p2));
return 1;
}
/* Set up a context for the gimplifier. */
void
push_gimplify_context (void)
{
gcc_assert (!gimplify_ctxp);
gimplify_ctxp
= (struct gimplify_ctx *) xcalloc (1, sizeof (struct gimplify_ctx));
if (optimize)
gimplify_ctxp->temp_htab
= htab_create (1000, gimple_tree_hash, gimple_tree_eq, free);
else
gimplify_ctxp->temp_htab = NULL;
}
/* Tear down a context for the gimplifier. If BODY is non-null, then
put the temporaries into the outer BIND_EXPR. Otherwise, put them
in the unexpanded_var_list. */
void
pop_gimplify_context (tree body)
{
tree t;
gcc_assert (gimplify_ctxp && !gimplify_ctxp->current_bind_expr);
/* APPLE LOCAL begin LLVM */
#ifndef ENABLE_LLVM
/* LLVM wants to know about gimple formal temps. */
for (t = gimplify_ctxp->temps; t ; t = TREE_CHAIN (t))
DECL_GIMPLE_FORMAL_TEMP_P (t) = 0;
#else
t = 0;
#endif
/* APPLE LOCAL end LLVM */
if (body)
declare_tmp_vars (gimplify_ctxp->temps, body);
else
record_vars (gimplify_ctxp->temps);
#if 0
if (!quiet_flag && optimize)
fprintf (stderr, " collisions: %f ",
htab_collisions (gimplify_ctxp->temp_htab));
#endif
if (optimize)
htab_delete (gimplify_ctxp->temp_htab);
free (gimplify_ctxp);
gimplify_ctxp = NULL;
}
void
gimple_push_bind_expr (tree bind)
{
TREE_CHAIN (bind) = gimplify_ctxp->current_bind_expr;
gimplify_ctxp->current_bind_expr = bind;
}
void
gimple_pop_bind_expr (void)
{
gimplify_ctxp->current_bind_expr
= TREE_CHAIN (gimplify_ctxp->current_bind_expr);
}
tree
gimple_current_bind_expr (void)
{
return gimplify_ctxp->current_bind_expr;
}
/* Returns true iff there is a COND_EXPR between us and the innermost
CLEANUP_POINT_EXPR. This info is used by gimple_push_cleanup. */
static bool
gimple_conditional_context (void)
{
return gimplify_ctxp->conditions > 0;
}
/* Note that we've entered a COND_EXPR. */
static void
gimple_push_condition (void)
{
#ifdef ENABLE_CHECKING
if (gimplify_ctxp->conditions == 0)
gcc_assert (!gimplify_ctxp->conditional_cleanups);
#endif
++(gimplify_ctxp->conditions);
}
/* Note that we've left a COND_EXPR. If we're back at unconditional scope
now, add any conditional cleanups we've seen to the prequeue. */
static void
gimple_pop_condition (tree *pre_p)
{
int conds = --(gimplify_ctxp->conditions);
gcc_assert (conds >= 0);
if (conds == 0)
{
append_to_statement_list (gimplify_ctxp->conditional_cleanups, pre_p);
gimplify_ctxp->conditional_cleanups = NULL_TREE;
}
}
/* A subroutine of append_to_statement_list{,_force}. T is not NULL. */
static void
append_to_statement_list_1 (tree t, tree *list_p)
{
tree list = *list_p;
tree_stmt_iterator i;
if (!list)
{
if (t && TREE_CODE (t) == STATEMENT_LIST)
{
*list_p = t;
return;
}
*list_p = list = alloc_stmt_list ();
}
i = tsi_last (list);
tsi_link_after (&i, t, TSI_CONTINUE_LINKING);
}
/* Add T to the end of the list container pointed by LIST_P.
If T is an expression with no effects, it is ignored. */
void
append_to_statement_list (tree t, tree *list_p)
{
if (t && TREE_SIDE_EFFECTS (t))
append_to_statement_list_1 (t, list_p);
}
/* Similar, but the statement is always added, regardless of side effects. */
void
append_to_statement_list_force (tree t, tree *list_p)
{
if (t != NULL_TREE)
append_to_statement_list_1 (t, list_p);
}
/* Both gimplify the statement T and append it to LIST_P. */
void
gimplify_and_add (tree t, tree *list_p)
{
gimplify_stmt (&t);
append_to_statement_list (t, list_p);
}
/* Strip off a legitimate source ending from the input string NAME of
length LEN. Rather than having to know the names used by all of
our front ends, we strip off an ending of a period followed by
up to five characters. (Java uses ".class".) */
static inline void
remove_suffix (char *name, int len)
{
int i;
for (i = 2; i < 8 && len > i; i++)
{
if (name[len - i] == '.')
{
name[len - i] = '\0';
break;
}
}
}
/* Create a nameless artificial label and put it in the current function
context. Returns the newly created label. */
tree
create_artificial_label (void)
{
tree lab = build_decl (LABEL_DECL, NULL_TREE, void_type_node);
DECL_ARTIFICIAL (lab) = 1;
DECL_IGNORED_P (lab) = 1;
DECL_CONTEXT (lab) = current_function_decl;
return lab;
}
/* Create a new temporary name with PREFIX. Returns an identifier. */
static GTY(()) unsigned int tmp_var_id_num;
tree
create_tmp_var_name (const char *prefix)
{
char *tmp_name;
if (prefix)
{
char *preftmp = ASTRDUP (prefix);
remove_suffix (preftmp, strlen (preftmp));
prefix = preftmp;
}
ASM_FORMAT_PRIVATE_NAME (tmp_name, prefix ? prefix : "T", tmp_var_id_num++);
return get_identifier (tmp_name);
}
/* Create a new temporary variable declaration of type TYPE.
Does NOT push it into the current binding. */
tree
create_tmp_var_raw (tree type, const char *prefix)
{
tree tmp_var;
tree new_type;
/* Make the type of the variable writable. */
new_type = build_type_variant (type, 0, 0);
TYPE_ATTRIBUTES (new_type) = TYPE_ATTRIBUTES (type);
tmp_var = build_decl (VAR_DECL, prefix ? create_tmp_var_name (prefix) : NULL,
type);
/* The variable was declared by the compiler. */
DECL_ARTIFICIAL (tmp_var) = 1;
/* And we don't want debug info for it. */
DECL_IGNORED_P (tmp_var) = 1;
/* Make the variable writable. */
TREE_READONLY (tmp_var) = 0;
DECL_EXTERNAL (tmp_var) = 0;
TREE_STATIC (tmp_var) = 0;
TREE_USED (tmp_var) = 1;
return tmp_var;
}
/* Create a new temporary variable declaration of type TYPE. DOES push the
variable into the current binding. Further, assume that this is called
only from gimplification or optimization, at which point the creation of
certain types are bugs. */
tree
create_tmp_var (tree type, const char *prefix)
{
tree tmp_var;
/* We don't allow types that are addressable (meaning we can't make copies),
incomplete, or of variable size. */
gcc_assert (!TREE_ADDRESSABLE (type)
&& COMPLETE_TYPE_P (type)
&& TREE_CODE (TYPE_SIZE_UNIT (type)) == INTEGER_CST);
tmp_var = create_tmp_var_raw (type, prefix);
gimple_add_tmp_var (tmp_var);
return tmp_var;
}
/* Given a tree, try to return a useful variable name that we can use
to prefix a temporary that is being assigned the value of the tree.
I.E. given <temp> = &A, return A. */
const char *
get_name (tree t)
{
tree stripped_decl;
stripped_decl = t;
STRIP_NOPS (stripped_decl);
if (DECL_P (stripped_decl) && DECL_NAME (stripped_decl))
return IDENTIFIER_POINTER (DECL_NAME (stripped_decl));
else
{
switch (TREE_CODE (stripped_decl))
{
case ADDR_EXPR:
return get_name (TREE_OPERAND (stripped_decl, 0));
break;
default:
return NULL;
}
}
}
/* Create a temporary with a name derived from VAL. Subroutine of
lookup_tmp_var; nobody else should call this function. */
static inline tree
create_tmp_from_val (tree val)
{
return create_tmp_var (TREE_TYPE (val), get_name (val));
}
/* Create a temporary to hold the value of VAL. If IS_FORMAL, try to reuse
an existing expression temporary. */
static tree
lookup_tmp_var (tree val, bool is_formal)
{
tree ret;
/* If not optimizing, never really reuse a temporary. local-alloc
won't allocate any variable that is used in more than one basic
block, which means it will go into memory, causing much extra
work in reload and final and poorer code generation, outweighing
the extra memory allocation here. */
/* APPLE LOCAL begin LLVM */
#ifdef ENABLE_LLVM
if (1) /* LLVM wants temporaries created in SSA form, never reuse one. */
#else
if (!optimize || !is_formal || TREE_SIDE_EFFECTS (val))
#endif
/* APPLE LOCAL end LLVM */
ret = create_tmp_from_val (val);
else
{
elt_t elt, *elt_p;
void **slot;
elt.val = val;
slot = htab_find_slot (gimplify_ctxp->temp_htab, (void *)&elt, INSERT);
if (*slot == NULL)
{
elt_p = xmalloc (sizeof (*elt_p));
elt_p->val = val;
elt_p->temp = ret = create_tmp_from_val (val);
*slot = (void *) elt_p;
}
else
{
elt_p = (elt_t *) *slot;
ret = elt_p->temp;
}
}
if (is_formal)
DECL_GIMPLE_FORMAL_TEMP_P (ret) = 1;
return ret;
}
/* Returns a formal temporary variable initialized with VAL. PRE_P is as
in gimplify_expr. Only use this function if:
1) The value of the unfactored expression represented by VAL will not
change between the initialization and use of the temporary, and
2) The temporary will not be otherwise modified.
For instance, #1 means that this is inappropriate for SAVE_EXPR temps,
and #2 means it is inappropriate for && temps.
For other cases, use get_initialized_tmp_var instead. */
static tree
internal_get_tmp_var (tree val, tree *pre_p, tree *post_p, bool is_formal)
{
tree t, mod;
gimplify_expr (&val, pre_p, post_p, is_gimple_formal_tmp_rhs, fb_rvalue);
t = lookup_tmp_var (val, is_formal);
mod = build (MODIFY_EXPR, TREE_TYPE (t), t, val);
if (EXPR_HAS_LOCATION (val))
SET_EXPR_LOCUS (mod, EXPR_LOCUS (val));
else
SET_EXPR_LOCATION (mod, input_location);
/* gimplify_modify_expr might want to reduce this further. */
gimplify_and_add (mod, pre_p);
/* If we're gimplifying into ssa, gimplify_modify_expr will have
given our temporary an ssa name. Find and return it. */
if (gimplify_ctxp->into_ssa)
t = TREE_OPERAND (mod, 0);
return t;
}
tree
get_formal_tmp_var (tree val, tree *pre_p)
{
return internal_get_tmp_var (val, pre_p, NULL, true);
}
/* Returns a temporary variable initialized with VAL. PRE_P and POST_P
are as in gimplify_expr. */
tree
get_initialized_tmp_var (tree val, tree *pre_p, tree *post_p)
{
return internal_get_tmp_var (val, pre_p, post_p, false);
}
/* Declares all the variables in VARS in SCOPE. */
void
declare_tmp_vars (tree vars, tree scope)
{
tree last = vars;
if (last)
{
tree temps;
/* C99 mode puts the default 'return 0;' for main outside the outer
braces. So drill down until we find an actual scope. */
while (TREE_CODE (scope) == COMPOUND_EXPR)
scope = TREE_OPERAND (scope, 0);
gcc_assert (TREE_CODE (scope) == BIND_EXPR);
temps = nreverse (last);
TREE_CHAIN (last) = BIND_EXPR_VARS (scope);
BIND_EXPR_VARS (scope) = temps;
}
}
void
gimple_add_tmp_var (tree tmp)
{
gcc_assert (!TREE_CHAIN (tmp) && !DECL_SEEN_IN_BIND_EXPR_P (tmp));
DECL_CONTEXT (tmp) = current_function_decl;
DECL_SEEN_IN_BIND_EXPR_P (tmp) = 1;
if (gimplify_ctxp)
{
TREE_CHAIN (tmp) = gimplify_ctxp->temps;
gimplify_ctxp->temps = tmp;
}
else if (cfun)
record_vars (tmp);
else
declare_tmp_vars (tmp, DECL_SAVED_TREE (current_function_decl));
}
/* Determines whether to assign a locus to the statement STMT. */
static bool
should_carry_locus_p (tree stmt)
{
/* Don't emit a line note for a label. We particularly don't want to
emit one for the break label, since it doesn't actually correspond
to the beginning of the loop/switch. */
if (TREE_CODE (stmt) == LABEL_EXPR)
return false;
/* Do not annotate empty statements, since it confuses gcov. */
if (!TREE_SIDE_EFFECTS (stmt))
return false;
return true;
}
static void
annotate_one_with_locus (tree t, location_t locus)
{
if (EXPR_P (t) && ! EXPR_HAS_LOCATION (t) && should_carry_locus_p (t))
SET_EXPR_LOCATION (t, locus);
}
void
annotate_all_with_locus (tree *stmt_p, location_t locus)
{
tree_stmt_iterator i;
if (!*stmt_p)
return;
for (i = tsi_start (*stmt_p); !tsi_end_p (i); tsi_next (&i))
{
tree t = tsi_stmt (i);
/* Assuming we've already been gimplified, we shouldn't
see nested chaining constructs anymore. */
gcc_assert (TREE_CODE (t) != STATEMENT_LIST
&& TREE_CODE (t) != COMPOUND_EXPR);
annotate_one_with_locus (t, locus);
}
}
/* Similar to copy_tree_r() but do not copy SAVE_EXPR or TARGET_EXPR nodes.
These nodes model computations that should only be done once. If we
were to unshare something like SAVE_EXPR(i++), the gimplification
process would create wrong code. */
static tree
mostly_copy_tree_r (tree *tp, int *walk_subtrees, void *data)
{
enum tree_code code = TREE_CODE (*tp);
/* Don't unshare types, decls, constants and SAVE_EXPR nodes. */
if (TREE_CODE_CLASS (code) == tcc_type
|| TREE_CODE_CLASS (code) == tcc_declaration
|| 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
uses. So just avert our eyes and cross our fingers. Silly Java. */
|| code == BLOCK)
*walk_subtrees = 0;
else
{
gcc_assert (code != BIND_EXPR);
copy_tree_r (tp, walk_subtrees, data);
}
return NULL_TREE;
}
/* APPLE LOCAL begin PR 14498, etc --bowdidge */
/* This routine was deleted from FSF mainline and lno-branch; however,
we're still using it in the next routine. Keep a local copy until
we can rewrite that other stuff. The FIXME on this worries me. */
/* Mark all the _DECL nodes under *TP as volatile. FIXME: This must die
after VA_ARG_EXPRs are properly lowered. */
static tree
mark_decls_volatile_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
void *data ATTRIBUTE_UNUSED)
{
if (SSA_VAR_P (*tp))
TREE_THIS_VOLATILE (*tp) = 1;
return NULL_TREE;
}
/* APPLE LOCAL end PR 14498, etc --bowdidge */
/* Callback for walk_tree to unshare most of the shared trees rooted at
*TP. If *TP has been visited already (i.e., TREE_VISITED (*TP) == 1),
then *TP is deep copied by calling copy_tree_r.
This unshares the same trees as copy_tree_r with the exception of
SAVE_EXPR nodes. These nodes model computations that should only be
done once. If we were to unshare something like SAVE_EXPR(i++), the
gimplification process would create wrong code. */
static tree
copy_if_shared_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
void *data ATTRIBUTE_UNUSED)
{
tree t = *tp;
enum tree_code code = TREE_CODE (t);
/* Skip types, decls, and constants. But we do want to look at their
types and the bounds of types. Mark them as visited so we properly
unmark their subtrees on the unmark pass. If we've already seen them,
don't look down further. */
if (TREE_CODE_CLASS (code) == tcc_type
|| TREE_CODE_CLASS (code) == tcc_declaration
|| TREE_CODE_CLASS (code) == tcc_constant)
{
if (TREE_VISITED (t))
*walk_subtrees = 0;
else
TREE_VISITED (t) = 1;
}
/* If this node has been visited already, unshare it and don't look
any deeper. */
else if (TREE_VISITED (t))
{
walk_tree (tp, mostly_copy_tree_r, NULL, NULL);
*walk_subtrees = 0;
}
/* Otherwise, mark the tree as visited and keep looking. */
else
/* APPLE LOCAL begin PR 14498, etc. --dbj */
/* History is complicated, this was in mainline prior to merge,
temporarily and erroneously removed at merge snapshot,
later put back, still later replaced by different mechanism. */
{
TREE_VISITED (t) = 1;
if (TREE_CODE (*tp) == VA_ARG_EXPR)
{
/* Mark any _DECL inside the operand as volatile to avoid
the optimizers messing around with it. We have to do this
early, otherwise we might mark a variable as volatile
after we gimplify other statements that use the variable
assuming it's not volatile. */
walk_tree (&TREE_OPERAND (*tp, 0), mark_decls_volatile_r,
NULL, NULL);
}
}
/* APPLE LOCAL end PR 14498, etc. */
return NULL_TREE;
}
static tree
unmark_visited_r (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
void *data ATTRIBUTE_UNUSED)
{
if (TREE_VISITED (*tp))
TREE_VISITED (*tp) = 0;
else
*walk_subtrees = 0;
return NULL_TREE;
}
/* Unshare all the trees in BODY_P, a pointer into the body of FNDECL, and the
bodies of any nested functions if we are unsharing the entire body of
FNDECL. */
static void
unshare_body (tree *body_p, tree fndecl)
{
struct cgraph_node *cgn = cgraph_node (fndecl);
walk_tree (body_p, copy_if_shared_r, NULL, NULL);
if (body_p == &DECL_SAVED_TREE (fndecl))
for (cgn = cgn->nested; cgn; cgn = cgn->next_nested)
unshare_body (&DECL_SAVED_TREE (cgn->decl), cgn->decl);
}
/* Likewise, but mark all trees as not visited. */
static void
unvisit_body (tree *body_p, tree fndecl)
{
struct cgraph_node *cgn = cgraph_node (fndecl);
walk_tree (body_p, unmark_visited_r, NULL, NULL);
if (body_p == &DECL_SAVED_TREE (fndecl))
for (cgn = cgn->nested; cgn; cgn = cgn->next_nested)
unvisit_body (&DECL_SAVED_TREE (cgn->decl), cgn->decl);
}
/* Unshare T and all the trees reached from T via TREE_CHAIN. */
void
unshare_all_trees (tree t)
{
walk_tree (&t, copy_if_shared_r, NULL, NULL);
walk_tree (&t, unmark_visited_r, NULL, NULL);
}
/* Unconditionally make an unshared copy of EXPR. This is used when using
stored expressions which span multiple functions, such as BINFO_VTABLE,
as the normal unsharing process can't tell that they're shared. */
tree
unshare_expr (tree expr)
{
walk_tree (&expr, mostly_copy_tree_r, NULL, NULL);
return expr;
}
/* A terser interface for building a representation of an exception
specification. */
tree
gimple_build_eh_filter (tree body, tree allowed, tree failure)
{
tree t;
/* FIXME should the allowed types go in TREE_TYPE? */
t = build (EH_FILTER_EXPR, void_type_node, allowed, NULL_TREE);
append_to_statement_list (failure, &EH_FILTER_FAILURE (t));
t = build (TRY_CATCH_EXPR, void_type_node, NULL_TREE, t);
append_to_statement_list (body, &TREE_OPERAND (t, 0));
return t;
}
/* WRAPPER is a code such as BIND_EXPR or CLEANUP_POINT_EXPR which can both
contain statements and have a value. Assign its value to a temporary
and give it void_type_node. Returns the temporary, or NULL_TREE if
WRAPPER was already void. */
tree
voidify_wrapper_expr (tree wrapper, tree temp)
{
if (!VOID_TYPE_P (TREE_TYPE (wrapper)))
{
tree *p, sub = wrapper;
restart:
/* Set p to point to the body of the wrapper. */
switch (TREE_CODE (sub))
{
case BIND_EXPR:
/* For a BIND_EXPR, the body is operand 1. */
p = &BIND_EXPR_BODY (sub);
break;
default:
p = &TREE_OPERAND (sub, 0);
break;
}
/* Advance to the last statement. Set all container types to void. */
if (TREE_CODE (*p) == STATEMENT_LIST)
{
tree_stmt_iterator i = tsi_last (*p);
p = tsi_end_p (i) ? NULL : tsi_stmt_ptr (i);
}
else
{
for (; TREE_CODE (*p) == COMPOUND_EXPR; p = &TREE_OPERAND (*p, 1))
{
TREE_SIDE_EFFECTS (*p) = 1;
TREE_TYPE (*p) = void_type_node;
}
}
if (p == NULL || IS_EMPTY_STMT (*p))
;
/* Look through exception handling. */
else if (TREE_CODE (*p) == TRY_FINALLY_EXPR
|| TREE_CODE (*p) == TRY_CATCH_EXPR)
{
sub = *p;
goto restart;
}
/* The C++ frontend already did this for us. */
else if (TREE_CODE (*p) == INIT_EXPR
|| TREE_CODE (*p) == TARGET_EXPR)
temp = TREE_OPERAND (*p, 0);
/* If we're returning a dereference, move the dereference
outside the wrapper. */
else if (TREE_CODE (*p) == INDIRECT_REF)
{
tree ptr = TREE_OPERAND (*p, 0);
temp = create_tmp_var (TREE_TYPE (ptr), "retval");
*p = build (MODIFY_EXPR, TREE_TYPE (ptr), temp, ptr);
temp = build1 (INDIRECT_REF, TREE_TYPE (TREE_TYPE (temp)), temp);
/* If this is a BIND_EXPR for a const inline function, it might not
have TREE_SIDE_EFFECTS set. That is no longer accurate. */
TREE_SIDE_EFFECTS (wrapper) = 1;
}
else
{
if (!temp)
temp = create_tmp_var (TREE_TYPE (wrapper), "retval");
*p = build (MODIFY_EXPR, TREE_TYPE (temp), temp, *p);
TREE_SIDE_EFFECTS (wrapper) = 1;
}
TREE_TYPE (wrapper) = void_type_node;
return temp;
}
return NULL_TREE;
}
/* Prepare calls to builtins to SAVE and RESTORE the stack as well as
a temporary through which they communicate. */
static void
build_stack_save_restore (tree *save, tree *restore)
{
tree save_call, tmp_var;
save_call =
build_function_call_expr (implicit_built_in_decls[BUILT_IN_STACK_SAVE],
NULL_TREE);
tmp_var = create_tmp_var (ptr_type_node, "saved_stack");
*save = build (MODIFY_EXPR, ptr_type_node, tmp_var, save_call);
*restore =
build_function_call_expr (implicit_built_in_decls[BUILT_IN_STACK_RESTORE],
tree_cons (NULL_TREE, tmp_var, NULL_TREE));
}
/* Gimplify a BIND_EXPR. Just voidify and recurse. */
static enum gimplify_status
gimplify_bind_expr (tree *expr_p, tree temp, tree *pre_p)
{
tree bind_expr = *expr_p;
bool old_save_stack = gimplify_ctxp->save_stack;
tree t;
temp = voidify_wrapper_expr (bind_expr, temp);
/* 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;
gimple_push_bind_expr (bind_expr);
gimplify_ctxp->save_stack = false;
gimplify_to_stmt_list (&BIND_EXPR_BODY (bind_expr));
if (gimplify_ctxp->save_stack)
{
tree stack_save, stack_restore;
/* Save stack on entry and restore it on exit. Add a try_finally
block to achieve this. Note that mudflap depends on the
format of the emitted code: see mx_register_decls(). */
build_stack_save_restore (&stack_save, &stack_restore);
t = build (TRY_FINALLY_EXPR, void_type_node,
BIND_EXPR_BODY (bind_expr), NULL_TREE);
append_to_statement_list (stack_restore, &TREE_OPERAND (t, 1));
BIND_EXPR_BODY (bind_expr) = NULL_TREE;
append_to_statement_list (stack_save, &BIND_EXPR_BODY (bind_expr));
append_to_statement_list (t, &BIND_EXPR_BODY (bind_expr));
}
gimplify_ctxp->save_stack = old_save_stack;
gimple_pop_bind_expr ();
if (temp)
{
*expr_p = temp;
append_to_statement_list (bind_expr, pre_p);
return GS_OK;
}
else
return GS_ALL_DONE;
}
/* Gimplify a RETURN_EXPR. If the expression to be returned is not a
GIMPLE value, it is assigned to a new temporary and the statement is
re-written to return the temporary.
PRE_P points to the list where side effects that must happen before
STMT should be stored. */
static enum gimplify_status
gimplify_return_expr (tree stmt, tree *pre_p)
{
tree ret_expr = TREE_OPERAND (stmt, 0);
tree result_decl, result;
if (!ret_expr || TREE_CODE (ret_expr) == RESULT_DECL
|| ret_expr == error_mark_node)
return GS_ALL_DONE;
if (VOID_TYPE_P (TREE_TYPE (TREE_TYPE (current_function_decl))))
result_decl = NULL_TREE;
else
{
result_decl = TREE_OPERAND (ret_expr, 0);
if (TREE_CODE (result_decl) == INDIRECT_REF)
/* See through a return by reference. */
result_decl = TREE_OPERAND (result_decl, 0);
gcc_assert ((TREE_CODE (ret_expr) == MODIFY_EXPR
|| TREE_CODE (ret_expr) == INIT_EXPR)
&& TREE_CODE (result_decl) == RESULT_DECL);
}
/* If aggregate_value_p is true, then we can return the bare RESULT_DECL.
Recall that aggregate_value_p is FALSE for any aggregate type that is
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
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
|| aggregate_value_p (result_decl, TREE_TYPE (current_function_decl)))
result = result_decl;
else if (gimplify_ctxp->return_temp)
result = gimplify_ctxp->return_temp;
else
{
result = create_tmp_var (TREE_TYPE (result_decl), NULL);
/* ??? With complex control flow (usually involving abnormal edges),
we can wind up warning about an uninitialized value for this. Due
to how this variable is constructed and initialized, this is never
true. Give up and never warn. */
TREE_NO_WARNING (result) = 1;
gimplify_ctxp->return_temp = result;
}
/* Smash the lhs of the MODIFY_EXPR to the temporary we plan to use.
Then gimplify the whole thing. */
if (result != result_decl)
TREE_OPERAND (ret_expr, 0) = result;
gimplify_and_add (TREE_OPERAND (stmt, 0), pre_p);
/* If we didn't use a temporary, then the result is just the result_decl.
Otherwise we need a simple copy. This should already be gimple. */
if (result == result_decl)
ret_expr = result;
else
ret_expr = build (MODIFY_EXPR, TREE_TYPE (result), result_decl, result);
TREE_OPERAND (stmt, 0) = ret_expr;
return GS_ALL_DONE;
}
/* Gimplifies a DECL_EXPR node *STMT_P by making any necessary allocation
and initialization explicit. */
static enum gimplify_status
gimplify_decl_expr (tree *stmt_p)
{
tree stmt = *stmt_p;
tree decl = DECL_EXPR_DECL (stmt);
*stmt_p = NULL_TREE;
if (TREE_TYPE (decl) == error_mark_node)
return GS_ERROR;
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);
if (TREE_CODE (decl) == VAR_DECL && !DECL_EXTERNAL (decl))
{
tree init = DECL_INITIAL (decl);
if (!TREE_CONSTANT (DECL_SIZE (decl)))
{
/* This is a variable-sized decl. Simplify its size and mark it
for deferred expansion. Note that mudflap depends on the format
of the emitted code: see mx_register_decls(). */
tree t, args, addr, ptr_type;
gimplify_one_sizepos (&DECL_SIZE (decl), stmt_p);
gimplify_one_sizepos (&DECL_SIZE_UNIT (decl), stmt_p);
/* All occurrences of this decl in final gimplified code will be
replaced by indirection. Setting DECL_VALUE_EXPR does two
things: First, it lets the rest of the gimplifier know what
replacement to use. Second, it lets the debug info know
where to find the value. */
ptr_type = build_pointer_type (TREE_TYPE (decl));
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;
args = tree_cons (NULL, DECL_SIZE_UNIT (decl), NULL);
t = built_in_decls[BUILT_IN_ALLOCA];
t = build_function_call_expr (t, args);
t = fold_convert (ptr_type, t);
t = build2 (MODIFY_EXPR, void_type_node, addr, t);
gimplify_and_add (t, stmt_p);
/* Indicate that we need to restore the stack level when the
enclosing BIND_EXPR is exited. */
gimplify_ctxp->save_stack = true;
}
if (init && init != error_mark_node)
{
if (!TREE_STATIC (decl))
{
DECL_INITIAL (decl) = NULL_TREE;
init = build (MODIFY_EXPR, void_type_node, decl, init);
gimplify_and_add (init, stmt_p);
}
else
/* We must still examine initializers for static variables
as they may contain a label address. */
walk_tree (&init, force_labels_r, NULL, NULL);
}
/* This decl isn't mentioned in the enclosing block, so add it to the
list of temps. FIXME it seems a bit of a kludge to say that
anonymous artificial vars aren't pushed, but everything else is. */
if (DECL_ARTIFICIAL (decl) && DECL_NAME (decl) == NULL_TREE)
gimple_add_tmp_var (decl);
}
return GS_ALL_DONE;
}
/* Gimplify a LOOP_EXPR. Normally this just involves gimplifying the body
and replacing the LOOP_EXPR with goto, but if the loop contains an
EXIT_EXPR, we need to append a label for it to jump to. */
static enum gimplify_status
gimplify_loop_expr (tree *expr_p, tree *pre_p)
{
tree saved_label = gimplify_ctxp->exit_label;
tree start_label = build1 (LABEL_EXPR, void_type_node, NULL_TREE);
tree jump_stmt = build_and_jump (&LABEL_EXPR_LABEL (start_label));
append_to_statement_list (start_label, pre_p);
gimplify_ctxp->exit_label = NULL_TREE;
gimplify_and_add (LOOP_EXPR_BODY (*expr_p), pre_p);
if (gimplify_ctxp->exit_label)
{
append_to_statement_list (jump_stmt, pre_p);
*expr_p = build1 (LABEL_EXPR, void_type_node, gimplify_ctxp->exit_label);
}
else
*expr_p = jump_stmt;
gimplify_ctxp->exit_label = saved_label;
return GS_ALL_DONE;
}
/* Compare two case labels. Because the front end should already have
made sure that case ranges do not overlap, it is enough to only compare
the CASE_LOW values of each case label. */
static int
compare_case_labels (const void *p1, const void *p2)
{
tree case1 = *(tree *)p1;
tree case2 = *(tree *)p2;
return tree_int_cst_compare (CASE_LOW (case1), CASE_LOW (case2));
}
/* Sort the case labels in LABEL_VEC in place in ascending order. */
void
sort_case_labels (tree label_vec)
{
size_t len = TREE_VEC_LENGTH (label_vec);
tree default_case = TREE_VEC_ELT (label_vec, len - 1);
if (CASE_LOW (default_case))
{
size_t i;
/* The last label in the vector should be the default case
but it is not. */
for (i = 0; i < len; ++i)
{
tree t = TREE_VEC_ELT (label_vec, i);
if (!CASE_LOW (t))
{
default_case = t;
TREE_VEC_ELT (label_vec, i) = TREE_VEC_ELT (label_vec, len - 1);
TREE_VEC_ELT (label_vec, len - 1) = default_case;
break;
}
}
}
qsort (&TREE_VEC_ELT (label_vec, 0), len - 1, sizeof (tree),
compare_case_labels);
}
/* Gimplify a SWITCH_EXPR, and collect a TREE_VEC of the labels it can
branch to. */
static enum gimplify_status
gimplify_switch_expr (tree *expr_p, tree *pre_p)
{
tree switch_expr = *expr_p;
enum gimplify_status ret;
ret = gimplify_expr (&SWITCH_COND (switch_expr), pre_p, NULL,
is_gimple_val, fb_rvalue);
if (SWITCH_BODY (switch_expr))
{
varray_type labels, saved_labels;
tree label_vec, default_case = NULL_TREE;
size_t i, len;
/* If someone can be bothered to fill in the labels, they can
be bothered to null out the body too. */
gcc_assert (!SWITCH_LABELS (switch_expr));
saved_labels = gimplify_ctxp->case_labels;
VARRAY_TREE_INIT (gimplify_ctxp->case_labels, 8, "case_labels");
gimplify_to_stmt_list (&SWITCH_BODY (switch_expr));
labels = gimplify_ctxp->case_labels;
gimplify_ctxp->case_labels = saved_labels;
len = VARRAY_ACTIVE_SIZE (labels);
for (i = 0; i < len; ++i)
{
tree t = VARRAY_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);
len--;
break;
}
}
label_vec = make_tree_vec (len + 1);
SWITCH_LABELS (*expr_p) = label_vec;
append_to_statement_list (switch_expr, pre_p);
if (! default_case)
{
/* If the switch has no default label, add one, so that we jump
around the switch body. */
default_case = build (CASE_LABEL_EXPR, void_type_node, NULL_TREE,
NULL_TREE, create_artificial_label ());
append_to_statement_list (SWITCH_BODY (switch_expr), pre_p);
*expr_p = build (LABEL_EXPR, void_type_node,
CASE_LABEL (default_case));
}
else
*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, len) = default_case;
sort_case_labels (label_vec);
SWITCH_BODY (switch_expr) = NULL;
}
else
gcc_assert (SWITCH_LABELS (switch_expr));
return ret;
}
static enum gimplify_status
gimplify_case_label_expr (tree *expr_p)
{
tree expr = *expr_p;
gcc_assert (gimplify_ctxp->case_labels);
VARRAY_PUSH_TREE (gimplify_ctxp->case_labels, expr);
*expr_p = build (LABEL_EXPR, void_type_node, CASE_LABEL (expr));
return GS_ALL_DONE;
}
/* Build a GOTO to the LABEL_DECL pointed to by LABEL_P, building it first
if necessary. */
tree
build_and_jump (tree *label_p)
{
if (label_p == NULL)
/* If there's nowhere to jump, just fall through. */
return NULL_TREE;
if (*label_p == NULL_TREE)
{
tree label = create_artificial_label ();
*label_p = label;
}
return build1 (GOTO_EXPR, void_type_node, *label_p);
}
/* Gimplify an EXIT_EXPR by converting to a GOTO_EXPR inside a COND_EXPR.
This also involves building a label to jump to and communicating it to
gimplify_loop_expr through gimplify_ctxp->exit_label. */
static enum gimplify_status
gimplify_exit_expr (tree *expr_p)
{
tree cond = TREE_OPERAND (*expr_p, 0);
tree expr;
expr = build_and_jump (&gimplify_ctxp->exit_label);
expr = build (COND_EXPR, void_type_node, cond, expr, NULL_TREE);
*expr_p = expr;
return GS_OK;
}
/* A helper function to be called via walk_tree. Mark all labels under *TP
as being forced. To be called for DECL_INITIAL of static variables. */
tree
force_labels_r (tree *tp, int *walk_subtrees, void *data ATTRIBUTE_UNUSED)
{
if (TYPE_P (*tp))
*walk_subtrees = 0;
if (TREE_CODE (*tp) == LABEL_DECL)
FORCED_LABEL (*tp) = 1;
return NULL_TREE;
}
/* *EXPR_P is a COMPONENT_REF being used as an rvalue. If its type is
different from its canonical type, wrap the whole thing inside a
NOP_EXPR and force the type of the COMPONENT_REF to be the canonical
type.
The canonical type of a COMPONENT_REF is the type of the field being
referenced--unless the field is a bit-field which can be read directly
in a smaller mode, in which case the canonical type is the
sign-appropriate type corresponding to that mode. */
static void
canonicalize_component_ref (tree *expr_p)
{
tree expr = *expr_p;
tree type;
gcc_assert (TREE_CODE (expr) == COMPONENT_REF);
if (INTEGRAL_TYPE_P (TREE_TYPE (expr)))
type = TREE_TYPE (get_unwidened (expr, NULL_TREE));
else
type = TREE_TYPE (TREE_OPERAND (expr, 1));
if (TREE_TYPE (expr) != type)
{
tree old_type = TREE_TYPE (expr);
/* Set the type of the COMPONENT_REF to the underlying type. */
TREE_TYPE (expr) = type;
/* And wrap the whole thing inside a NOP_EXPR. */
expr = build1 (NOP_EXPR, old_type, expr);
*expr_p = expr;
}
}
/* If a NOP conversion is changing a pointer to array of foo to a pointer
to foo, embed that change in the ADDR_EXPR by converting
T array[U];
(T *)&array
==>
&array[L]
where L is the lower bound. For simplicity, only do this for constant
lower bound. */
static void
canonicalize_addr_expr (tree *expr_p)
{
tree expr = *expr_p;
tree ctype = TREE_TYPE (expr);
tree addr_expr = TREE_OPERAND (expr, 0);
tree atype = TREE_TYPE (addr_expr);
tree dctype, datype, ddatype, otype, obj_expr;
/* Both cast and addr_expr types should be pointers. */
if (!POINTER_TYPE_P (ctype) || !POINTER_TYPE_P (atype))
return;
/* The addr_expr type should be a pointer to an array. */
datype = TREE_TYPE (atype);
if (TREE_CODE (datype) != ARRAY_TYPE)
return;
/* Both cast and addr_expr types should address the same object type. */
dctype = TREE_TYPE (ctype);
ddatype = TREE_TYPE (datype);
if (!lang_hooks.types_compatible_p (ddatype, dctype))
return;
/* The addr_expr and the object type should match. */
obj_expr = TREE_OPERAND (addr_expr, 0);
otype = TREE_TYPE (obj_expr);
if (!lang_hooks.types_compatible_p (otype, datype))
return;
/* The lower bound and element sizes must be constant. */
if (!TYPE_SIZE_UNIT (dctype)
|| TREE_CODE (TYPE_SIZE_UNIT (dctype)) != INTEGER_CST
|| !TYPE_DOMAIN (datype) || !TYPE_MIN_VALUE (TYPE_DOMAIN (datype))
|| TREE_CODE (TYPE_MIN_VALUE (TYPE_DOMAIN (datype))) != INTEGER_CST)
return;
/* All checks succeeded. Build a new node to merge the cast. */
*expr_p = build4 (ARRAY_REF, dctype, obj_expr,
TYPE_MIN_VALUE (TYPE_DOMAIN (datype)),
TYPE_MIN_VALUE (TYPE_DOMAIN (datype)),
size_binop (EXACT_DIV_EXPR, TYPE_SIZE_UNIT (dctype),
size_int (TYPE_ALIGN_UNIT (dctype))));
*expr_p = build1 (ADDR_EXPR, ctype, *expr_p);
}
/* *EXPR_P is a NOP_EXPR or CONVERT_EXPR. Remove it and/or other conversions
underneath as appropriate. */
static enum gimplify_status
gimplify_conversion (tree *expr_p)
{
gcc_assert (TREE_CODE (*expr_p) == NOP_EXPR
|| TREE_CODE (*expr_p) == CONVERT_EXPR);
/* Then strip away all but the outermost conversion. */
STRIP_SIGN_NOPS (TREE_OPERAND (*expr_p, 0));
/* And remove the outermost conversion if it's useless. */
if (tree_ssa_useless_type_conversion (*expr_p))
*expr_p = TREE_OPERAND (*expr_p, 0);
/* If we still have a conversion at the toplevel,
then canonicalize some constructs. */
if (TREE_CODE (*expr_p) == NOP_EXPR || TREE_CODE (*expr_p) == CONVERT_EXPR)
{
tree sub = TREE_OPERAND (*expr_p, 0);
/* If a NOP conversion is changing the type of a COMPONENT_REF
expression, then canonicalize its type now in order to expose more
redundant conversions. */
if (TREE_CODE (sub) == COMPONENT_REF)
canonicalize_component_ref (&TREE_OPERAND (*expr_p, 0));
/* If a NOP conversion is changing a pointer to array of foo
to a pointer to foo, embed that change in the ADDR_EXPR. */
else if (TREE_CODE (sub) == ADDR_EXPR)
canonicalize_addr_expr (expr_p);
}
return GS_OK;
}
/* Gimplify the COMPONENT_REF, ARRAY_REF, REALPART_EXPR or IMAGPART_EXPR
node pointed by EXPR_P.
compound_lval
: min_lval '[' val ']'
| min_lval '.' ID
| compound_lval '[' val ']'
| compound_lval '.' ID
This is not part of the original SIMPLE definition, which separates
array and member references, but it seems reasonable to handle them
together. Also, this way we don't run into problems with union
aliasing; gcc requires that for accesses through a union to alias, the
union reference must be explicit, which was not always the case when we
were splitting up array and member refs.
PRE_P points to the list where side effects that must happen before
*EXPR_P should be stored.
POST_P points to the list where side effects that must happen after
*EXPR_P should be stored. */
static enum gimplify_status
gimplify_compound_lval (tree *expr_p, tree *pre_p,
tree *post_p, fallback_t fallback)
{
tree *p;
varray_type 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");
/* We can handle anything that get_inner_reference can deal with. */
for (p = expr_p; ; p = &TREE_OPERAND (*p, 0))
{
/* 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))
break;
VARRAY_PUSH_GENERIC_PTR_NOGC (stack, *p);
}
gcc_assert (VARRAY_ACTIVE_SIZE (stack));
/* Now STACK is a stack of pointers to all the refs we've walked through
and P points to the innermost expression.
Java requires that we elaborated nodes in source order. That
means we must gimplify the inner expression followed by each of
the indices, in order. But we can't gimplify the inner
expression until we deal with any variable bounds, sizes, or
positions in order to deal with PLACEHOLDER_EXPRs.
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--)
{
tree t = VARRAY_GENERIC_PTR_NOGC (stack, i);
if (TREE_CODE (t) == ARRAY_REF || TREE_CODE (t) == ARRAY_RANGE_REF)
{
/* Gimplify the low bound and element type size and put them into
the ARRAY_REF. If these values are set, they have already been
gimplified. */
/* APPLE LOCAL begin LLVM */
/* Handle the LLVM extension that allows: (ARRAY_REF ptr, idx) */
if (!TREE_OPERAND (t, 2) &&
TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == ARRAY_TYPE)
/* APPLE LOCAL end LLVM */
{
tree low = unshare_expr (array_ref_low_bound (t));
if (!is_gimple_min_invariant (low))
{
TREE_OPERAND (t, 2) = low;
tret = gimplify_expr (&TREE_OPERAND (t, 2), pre_p, post_p,
is_gimple_formal_tmp_reg, fb_rvalue);
ret = MIN (ret, tret);
}
}
/* APPLE LOCAL begin LLVM */
/* Handle the LLVM extension that allows: (ARRAY_REF ptr, idx) */
if (!TREE_OPERAND (t, 3) &&
TREE_CODE (TREE_TYPE (TREE_OPERAND (t, 0))) == ARRAY_TYPE)
/* APPLE LOCAL end LLVM */
{
tree elmt_type = TREE_TYPE (TREE_TYPE (TREE_OPERAND (t, 0)));
tree elmt_size = unshare_expr (array_ref_element_size (t));
tree factor = size_int (TYPE_ALIGN_UNIT (elmt_type));
/* Divide the element size by the alignment of the element
type (above). */
elmt_size = size_binop (EXACT_DIV_EXPR, elmt_size, factor);
if (!is_gimple_min_invariant (elmt_size))
{
TREE_OPERAND (t, 3) = elmt_size;
tret = gimplify_expr (&TREE_OPERAND (t, 3), pre_p, post_p,
is_gimple_formal_tmp_reg, fb_rvalue);
ret = MIN (ret, tret);
}
}
}
else if (TREE_CODE (t) == COMPONENT_REF)
{
/* Set the field offset into T and gimplify it. */
if (!TREE_OPERAND (t, 2))
{
tree offset = unshare_expr (component_ref_field_offset (t));
tree field = TREE_OPERAND (t, 1);
tree factor
= size_int (DECL_OFFSET_ALIGN (field) / BITS_PER_UNIT);
/* Divide the offset by its alignment. */
offset = size_binop (EXACT_DIV_EXPR, offset, factor);
if (!is_gimple_min_invariant (offset))
{
TREE_OPERAND (t, 2) = offset;
tret = gimplify_expr (&TREE_OPERAND (t, 2), pre_p, post_p,
is_gimple_formal_tmp_reg, fb_rvalue);
ret = MIN (ret, tret);
}
}
}
}
/* APPLE LOCAL begin mainline LLVM */
/* 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);
/* APPLE LOCAL end mainline LLVM */
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; )
{
tree t = VARRAY_TOP_TREE (stack);
if (TREE_CODE (t) == ARRAY_REF || TREE_CODE (t) == ARRAY_RANGE_REF)
{
/* Gimplify the dimension.
Temporary fix for gcc.c-torture/execute/20040313-1.c.
Gimplify non-constant array indices into a temporary
variable.
FIXME - The real fix is to gimplify post-modify
expressions into a minimal gimple lvalue. However, that
exposes bugs in alias analysis. The alias analyzer does
not handle &PTR->FIELD very well. Will fix after the
branch is merged into mainline (dnovillo 2004-05-03). */
if (!is_gimple_min_invariant (TREE_OPERAND (t, 1)))
{
tret = gimplify_expr (&TREE_OPERAND (t, 1), pre_p, post_p,
is_gimple_formal_tmp_reg, fb_rvalue);
ret = MIN (ret, tret);
}
}
else if (TREE_CODE (t) == BIT_FIELD_REF)
{
tret = gimplify_expr (&TREE_OPERAND (t, 1), pre_p, post_p,
is_gimple_val, fb_rvalue);
ret = MIN (ret, tret);
tret = gimplify_expr (&TREE_OPERAND (t, 2), pre_p, post_p,
is_gimple_val, fb_rvalue);
ret = MIN (ret, tret);
}
STRIP_USELESS_TYPE_CONVERSION (TREE_OPERAND (t, 0));
/* The innermost expression P may have originally had TREE_SIDE_EFFECTS
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, tret);
/* If the outermost expression is a COMPONENT_REF, canonicalize its type. */
if ((fallback & fb_rvalue) && TREE_CODE (*expr_p) == COMPONENT_REF)
{
canonicalize_component_ref (expr_p);
ret = MIN (ret, GS_OK);
}
VARRAY_FREE (stack);
return ret;
}
/* Gimplify the self modifying expression pointed by EXPR_P (++, --, +=, -=).
PRE_P points to the list where side effects that must happen before
*EXPR_P should be stored.
POST_P points to the list where side effects that must happen after
*EXPR_P should be stored.
WANT_VALUE is nonzero iff we want to use the value of this expression
in another expression. */
static enum gimplify_status
gimplify_self_mod_expr (tree *expr_p, tree *pre_p, tree *post_p,
bool want_value)
{
enum tree_code code;
tree lhs, lvalue, rhs, t1;
bool postfix;
enum tree_code arith_code;
enum gimplify_status ret;
code = TREE_CODE (*expr_p);
gcc_assert (code == POSTINCREMENT_EXPR || code == POSTDECREMENT_EXPR
|| code == PREINCREMENT_EXPR || code == PREDECREMENT_EXPR);
/* Prefix or postfix? */
if (code == POSTINCREMENT_EXPR || code == POSTDECREMENT_EXPR)
/* Faster to treat as prefix if result is not used. */
postfix = want_value;
else
postfix = false;
/* Add or subtract? */
if (code == PREINCREMENT_EXPR || code == POSTINCREMENT_EXPR)
arith_code = PLUS_EXPR;
else
arith_code = MINUS_EXPR;
/* Gimplify the LHS into a GIMPLE lvalue. */
lvalue = TREE_OPERAND (*expr_p, 0);
ret = gimplify_expr (&lvalue, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
if (ret == GS_ERROR)
return ret;
/* Extract the operands to the arithmetic operation. */
lhs = lvalue;
rhs = TREE_OPERAND (*expr_p, 1);
/* For postfix operator, we evaluate the LHS to an rvalue and then use
that as the result value and in the postqueue operation. */
if (postfix)
{
ret = gimplify_expr (&lhs, pre_p, post_p, is_gimple_val, fb_rvalue);
if (ret == GS_ERROR)
return ret;
}
t1 = build (arith_code, TREE_TYPE (*expr_p), lhs, rhs);
t1 = build (MODIFY_EXPR, TREE_TYPE (lvalue), lvalue, t1);
if (postfix)
{
gimplify_and_add (t1, post_p);
*expr_p = lhs;
return GS_ALL_DONE;
}
else
{
*expr_p = t1;
return GS_OK;
}
}
/* If *EXPR_P has a variable sized type, wrap it in a WITH_SIZE_EXPR. */
static void
maybe_with_size_expr (tree *expr_p)
{
tree expr = *expr_p;
tree type = TREE_TYPE (expr);
tree size;
/* If we've already wrapped this or the type is error_mark_node, we can't do
anything. */
if (TREE_CODE (expr) == WITH_SIZE_EXPR
|| type == error_mark_node)
return;
/* If the size isn't known or is a constant, we have nothing to do. */
size = TYPE_SIZE_UNIT (type);
if (!size || TREE_CODE (size) == INTEGER_CST)
return;
/* Otherwise, make a WITH_SIZE_EXPR. */
size = unshare_expr (size);
size = SUBSTITUTE_PLACEHOLDER_IN_EXPR (size, expr);
*expr_p = build2 (WITH_SIZE_EXPR, type, expr, size);
}
/* Subroutine of gimplify_call_expr: Gimplify a single argument. */
static enum gimplify_status
gimplify_arg (tree *expr_p, tree *pre_p)
{
bool (*test) (tree);
fallback_t fb;
/* In general, we allow lvalues for function arguments to avoid
extra overhead of copying large aggregates out of even larger
aggregates into temporaries only to copy the temporaries to
the argument list. Make optimizers happy by pulling out to
temporaries those types that fit in registers. */
if (is_gimple_reg_type (TREE_TYPE (*expr_p)))
test = is_gimple_val, fb = fb_rvalue;
else
test = is_gimple_lvalue, fb = fb_either;
/* If this is a variable sized type, we must remember the size. */
maybe_with_size_expr (expr_p);
/* There is a sequence point before a function call. Side effects in
the argument list must occur before the actual call. So, when
gimplifying arguments, force gimplify_expr to use an internal
post queue which is then appended to the end of PRE_P. */
return gimplify_expr (expr_p, pre_p, NULL, test, fb);
}
/* Gimplify the CALL_EXPR node pointed 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. */
static enum gimplify_status
gimplify_call_expr (tree *expr_p, tree *pre_p, bool want_value)
{
tree decl;
tree arglist;
enum gimplify_status ret;
gcc_assert (TREE_CODE (*expr_p) == CALL_EXPR);
/* For reliable diagnostics during inlining, it is necessary that
every call_expr be annotated with file and line. */
if (! EXPR_HAS_LOCATION (*expr_p))
SET_EXPR_LOCATION (*expr_p, input_location);
/* This may be a call to a builtin function.
Builtin function calls may be transformed into different
(and more efficient) builtin function calls under certain
circumstances. Unfortunately, gimplification can muck things
up enough that the builtin expanders are not aware that certain
transformations are still valid.
So we attempt transformation/gimplification of the call before
we gimplify the CALL_EXPR. At this time we do not manage to
transform all calls in the same manner as the expanders do, but
we do transform most of them. */
decl = get_callee_fndecl (*expr_p);
if (decl && DECL_BUILT_IN (decl))
{
tree new = fold_builtin (*expr_p, !want_value);
if (new && new != *expr_p)
{
/* There was a transformation of this call which computes the
same value, but in a more efficient way. Return and try
again. */
*expr_p = new;
return GS_OK;
}
if (DECL_BUILT_IN_CLASS (decl) == BUILT_IN_NORMAL
&& DECL_FUNCTION_CODE (decl) == BUILT_IN_VA_START)
{
tree arglist = TREE_OPERAND (*expr_p, 1);
if (!arglist || !TREE_CHAIN (arglist))
{
error ("too few arguments to function %<va_start%>");
*expr_p = build_empty_stmt ();
return GS_OK;
}
if (fold_builtin_next_arg (TREE_CHAIN (arglist)))
{
*expr_p = build_empty_stmt ();
return GS_OK;
}
/* Avoid gimplifying the second argument to va_start, which needs
to be the plain PARM_DECL. */
return gimplify_arg (&TREE_VALUE (TREE_OPERAND (*expr_p, 1)), pre_p);
}
}
/* There is a sequence point before the call, so any side effects in
the calling expression must occur before the actual call. Force
gimplify_expr to use an internal post queue. */
ret = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, NULL,
is_gimple_call_addr, fb_rvalue);
if (PUSH_ARGS_REVERSED)
TREE_OPERAND (*expr_p, 1) = nreverse (TREE_OPERAND (*expr_p, 1));
for (arglist = TREE_OPERAND (*expr_p, 1); arglist;
arglist = TREE_CHAIN (arglist))
{
enum gimplify_status t;
t = gimplify_arg (&TREE_VALUE (arglist), pre_p);
if (t == GS_ERROR)
ret = GS_ERROR;
}
if (PUSH_ARGS_REVERSED)
TREE_OPERAND (*expr_p, 1) = nreverse (TREE_OPERAND (*expr_p, 1));
/* Try this again in case gimplification exposed something. */
if (ret != GS_ERROR && decl && DECL_BUILT_IN (decl))
{
tree new = fold_builtin (*expr_p, !want_value);
if (new && new != *expr_p)
{
/* There was a transformation of this call which computes the
same value, but in a more efficient way. Return and try
again. */
*expr_p = new;
return GS_OK;
}
}
/* If the function is "const" or "pure", then clear TREE_SIDE_EFFECTS on its
decl. This allows us to eliminate redundant or useless
calls to "const" functions. */
if (TREE_CODE (*expr_p) == CALL_EXPR
&& (call_expr_flags (*expr_p) & (ECF_CONST | ECF_PURE)))
TREE_SIDE_EFFECTS (*expr_p) = 0;
return ret;
}
/* Handle shortcut semantics in the predicate operand of a COND_EXPR by
rewriting it into multiple COND_EXPRs, and possibly GOTO_EXPRs.
TRUE_LABEL_P and FALSE_LABEL_P point to the labels to jump to if the
condition is true or false, respectively. If null, we should generate
our own to skip over the evaluation of this specific expression.
This function is the tree equivalent of do_jump.
shortcut_cond_r should only be called by shortcut_cond_expr. */
static tree
shortcut_cond_r (tree pred, tree *true_label_p, tree *false_label_p)
{
tree local_label = NULL_TREE;
tree t, expr = NULL;
/* OK, it's not a simple case; we need to pull apart the COND_EXPR to
retain the shortcut semantics. Just insert the gotos here;
shortcut_cond_expr will append the real blocks later. */
if (TREE_CODE (pred) == TRUTH_ANDIF_EXPR)
{
/* Turn if (a && b) into
if (a); else goto no;
if (b) goto yes; else goto no;
(no:) */
if (false_label_p == NULL)
false_label_p = &local_label;
t = shortcut_cond_r (TREE_OPERAND (pred, 0), NULL, false_label_p);
append_to_statement_list (t, &expr);
t = shortcut_cond_r (TREE_OPERAND (pred, 1), true_label_p,
false_label_p);
append_to_statement_list (t, &expr);
}
else if (TREE_CODE (pred) == TRUTH_ORIF_EXPR)
{
/* Turn if (a || b) into
if (a) goto yes;
if (b) goto yes; else goto no;
(yes:) */
if (true_label_p == NULL)
true_label_p = &local_label;
t = shortcut_cond_r (TREE_OPERAND (pred, 0), true_label_p, NULL);
append_to_statement_list (t, &expr);
t = shortcut_cond_r (TREE_OPERAND (pred, 1), true_label_p,
false_label_p);
append_to_statement_list (t, &expr);
}
else if (TREE_CODE (pred) == COND_EXPR)
{
/* As long as we're messing with gotos, turn if (a ? b : c) into
if (a)
if (b) goto yes; else goto no;
else
if (c) goto yes; else goto no; */
expr = build (COND_EXPR, void_type_node, TREE_OPERAND (pred, 0),
shortcut_cond_r (TREE_OPERAND (pred, 1), true_label_p,
false_label_p),
shortcut_cond_r (TREE_OPERAND (pred, 2), true_label_p,
false_label_p));
}
else
{
expr = build (COND_EXPR, void_type_node, pred,
build_and_jump (true_label_p),
build_and_jump (false_label_p));
}
if (local_label)
{
t = build1 (LABEL_EXPR, void_type_node, local_label);
append_to_statement_list (t, &expr);
}
return expr;
}
static tree
shortcut_cond_expr (tree expr)
{
tree pred = TREE_OPERAND (expr, 0);
tree then_ = TREE_OPERAND (expr, 1);
tree else_ = TREE_OPERAND (expr, 2);
tree true_label, false_label, end_label, t;
tree *true_label_p;
tree *false_label_p;
bool emit_end, emit_false, jump_over_else;
bool then_se = then_ && TREE_SIDE_EFFECTS (then_);
bool else_se = else_ && TREE_SIDE_EFFECTS (else_);
/* First do simple transformations. */
if (!else_se)
{
/* If there is no 'else', turn (a && b) into if (a) if (b). */
while (TREE_CODE (pred) == TRUTH_ANDIF_EXPR)
{
TREE_OPERAND (expr, 0) = TREE_OPERAND (pred, 1);
then_ = shortcut_cond_expr (expr);
then_se = then_ && TREE_SIDE_EFFECTS (then_);
pred = TREE_OPERAND (pred, 0);
expr = build (COND_EXPR, void_type_node, pred, then_, NULL_TREE);
}
}
if (!then_se)
{
/* If there is no 'then', turn
if (a || b); else d
into
if (a); else if (b); else d. */
while (TREE_CODE (pred) == TRUTH_ORIF_EXPR)
{
TREE_OPERAND (expr, 0) = TREE_OPERAND (pred, 1);
else_ = shortcut_cond_expr (expr);
else_se = else_ && TREE_SIDE_EFFECTS (else_);
pred = TREE_OPERAND (pred, 0);
expr = build (COND_EXPR, void_type_node, pred, NULL_TREE, else_);
}
}
/* If we're done, great. */
if (TREE_CODE (pred) != TRUTH_ANDIF_EXPR
&& TREE_CODE (pred) != TRUTH_ORIF_EXPR)
return expr;
/* Otherwise we need to mess with gotos. Change
if (a) c; else d;
to
if (a); else goto no;
c; goto end;
no: d; end:
and recursively gimplify the condition. */
true_label = false_label = end_label = NULL_TREE;
/* If our arms just jump somewhere, hijack those labels so we don't
generate jumps to jumps. */
if (then_
&& TREE_CODE (then_) == GOTO_EXPR
&& TREE_CODE (GOTO_DESTINATION (then_)) == LABEL_DECL)
{
true_label = GOTO_DESTINATION (then_);
then_ = NULL;
then_se = false;
}
if (else_
&& TREE_CODE (else_) == GOTO_EXPR
&& TREE_CODE (GOTO_DESTINATION (else_)) == LABEL_DECL)
{
false_label = GOTO_DESTINATION (else_);
else_ = NULL;
else_se = false;
}
/* If we aren't hijacking a label for the 'then' branch, it falls through. */
if (true_label)
true_label_p = &true_label;
else
true_label_p = NULL;
/* The 'else' branch also needs a label if it contains interesting code. */
if (false_label || else_se)
false_label_p = &false_label;
else
false_label_p = NULL;
/* If there was nothing else in our arms, just forward the label(s). */
if (!then_se && !else_se)
return shortcut_cond_r (pred, true_label_p, false_label_p);
/* If our last subexpression already has a terminal label, reuse it. */
if (else_se)
expr = expr_last (else_);
else if (then_se)
expr = expr_last (then_);
else
expr = NULL;
if (expr && TREE_CODE (expr) == LABEL_EXPR)
end_label = LABEL_EXPR_LABEL (expr);
/* If we don't care about jumping to the 'else' branch, jump to the end
if the condition is false. */
if (!false_label_p)
false_label_p = &end_label;
/* We only want to emit these labels if we aren't hijacking them. */
emit_end = (end_label == NULL_TREE);
emit_false = (false_label == NULL_TREE);
/* We only emit the jump over the else clause if we have to--if the
then clause may fall through. Otherwise we can wind up with a
useless jump and a useless label at the end of gimplified code,
which will cause us to think that this conditional as a whole
falls through even if it doesn't. If we then inline a function
which ends with such a condition, that can cause us to issue an
inappropriate warning about control reaching the end of a
non-void function. */
jump_over_else = block_may_fallthru (then_);
pred = shortcut_cond_r (pred, true_label_p, false_label_p);
expr = NULL;
append_to_statement_list (pred, &expr);
append_to_statement_list (then_, &expr);
if (else_se)
{
if (jump_over_else)
{
t = build_and_jump (&end_label);
append_to_statement_list (t, &expr);
}
if (emit_false)
{
t = build1 (LABEL_EXPR, void_type_node, false_label);
append_to_statement_list (t, &expr);
}
append_to_statement_list (else_, &expr);
}
if (emit_end && end_label)
{
t = build1 (LABEL_EXPR, void_type_node, end_label);
append_to_statement_list (t, &expr);
}
return expr;
}
/* EXPR is used in a boolean context; make sure it has BOOLEAN_TYPE. */
static tree
gimple_boolify (tree expr)
{
tree type = TREE_TYPE (expr);
if (TREE_CODE (type) == BOOLEAN_TYPE)
return expr;
/* If this is the predicate of a COND_EXPR, it might not even be a
truthvalue yet. */
expr = lang_hooks.truthvalue_conversion (expr);
switch (TREE_CODE (expr))
{
case TRUTH_AND_EXPR:
case TRUTH_OR_EXPR:
case TRUTH_XOR_EXPR:
case TRUTH_ANDIF_EXPR:
case TRUTH_ORIF_EXPR:
/* Also boolify the arguments of truth exprs. */
TREE_OPERAND (expr, 1) = gimple_boolify (TREE_OPERAND (expr, 1));
/* FALLTHRU */
case TRUTH_NOT_EXPR:
TREE_OPERAND (expr, 0) = gimple_boolify (TREE_OPERAND (expr, 0));
/* FALLTHRU */
case EQ_EXPR: case NE_EXPR:
case LE_EXPR: case GE_EXPR: case LT_EXPR: case GT_EXPR:
/* These expressions always produce boolean results. */
TREE_TYPE (expr) = boolean_type_node;
return expr;
default:
/* Other expressions that get here must have boolean values, but
might need to be converted to the appropriate mode. */
return convert (boolean_type_node, expr);
}
}
/* Convert the conditional expression pointed by EXPR_P '(p) ? a : b;'
into
if (p) if (p)
t1 = a; a;
else or else
t1 = b; b;
t1;
The second form is used when *EXPR_P is of type void.
TARGET is the tree for T1 above.
PRE_P points to the list where side effects that must happen before
*EXPR_P should be stored.
POST_P points to the list where side effects that must happen after
*EXPR_P should be stored. */
static enum gimplify_status
gimplify_cond_expr (tree *expr_p, tree *pre_p, tree *post_p, tree target,
fallback_t fallback)
{
tree expr = *expr_p;
tree tmp, tmp2, type;
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))
{
tree result;
if (target)
{
ret = gimplify_expr (&target, pre_p, post_p,
is_gimple_min_lval, fb_lvalue);
if (ret != GS_ERROR)
ret = GS_OK;
result = tmp = target;
tmp2 = unshare_expr (target);
}
else if ((fallback & fb_lvalue) == 0)
{
result = tmp2 = tmp = create_tmp_var (TREE_TYPE (expr), "iftmp");
ret = GS_ALL_DONE;
}
else
{
tree type = build_pointer_type (TREE_TYPE (expr));
if (TREE_TYPE (TREE_OPERAND (expr, 1)) != void_type_node)
TREE_OPERAND (expr, 1) =
build_fold_addr_expr (TREE_OPERAND (expr, 1));
if (TREE_TYPE (TREE_OPERAND (expr, 2)) != void_type_node)
TREE_OPERAND (expr, 2) =
build_fold_addr_expr (TREE_OPERAND (expr, 2));
tmp2 = tmp = create_tmp_var (type, "iftmp");
expr = build (COND_EXPR, void_type_node, TREE_OPERAND (expr, 0),
TREE_OPERAND (expr, 1), TREE_OPERAND (expr, 2));
result = build_fold_indirect_ref (tmp);
ret = GS_ALL_DONE;
}
/* Build the then clause, 't1 = a;'. But don't build an assignment
if this branch is void; in C++ it can be, if it's a throw. */
if (TREE_TYPE (TREE_OPERAND (expr, 1)) != void_type_node)
TREE_OPERAND (expr, 1)
= build (MODIFY_EXPR, void_type_node, tmp, TREE_OPERAND (expr, 1));
/* Build the else clause, 't1 = b;'. */
if (TREE_TYPE (TREE_OPERAND (expr, 2)) != void_type_node)
TREE_OPERAND (expr, 2)
= build (MODIFY_EXPR, void_type_node, tmp2, TREE_OPERAND (expr, 2));
TREE_TYPE (expr) = void_type_node;
recalculate_side_effects (expr);
/* Move the COND_EXPR to the prequeue. */
gimplify_and_add (expr, pre_p);
*expr_p = result;
return ret;
}
/* Make sure the condition has BOOLEAN_TYPE. */
TREE_OPERAND (expr, 0) = gimple_boolify (TREE_OPERAND (expr, 0));
/* Break apart && and || conditions. */
if (TREE_CODE (TREE_OPERAND (expr, 0)) == TRUTH_ANDIF_EXPR
|| TREE_CODE (TREE_OPERAND (expr, 0)) == TRUTH_ORIF_EXPR)
{
expr = shortcut_cond_expr (expr);
if (expr != *expr_p)
{
*expr_p = expr;
/* We can't rely on gimplify_expr to re-gimplify the expanded
form properly, as cleanups might cause the target labels to be
wrapped in a TRY_FINALLY_EXPR. To prevent that, we need to
set up a conditional context. */
gimple_push_condition ();
gimplify_stmt (expr_p);
gimple_pop_condition (pre_p);
return GS_ALL_DONE;
}
}
/* Now do the normal gimplification. */
ret = gimplify_expr (&TREE_OPERAND (expr, 0), pre_p, NULL,
is_gimple_condexpr, fb_rvalue);
gimple_push_condition ();
gimplify_to_stmt_list (&TREE_OPERAND (expr, 1));
gimplify_to_stmt_list (&TREE_OPERAND (expr, 2));
recalculate_side_effects (expr);
gimple_pop_condition (pre_p);
if (ret == GS_ERROR)
;
else if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 1)))
ret = GS_ALL_DONE;
else if (TREE_SIDE_EFFECTS (TREE_OPERAND (expr, 2)))
/* Rewrite "if (a); else b" to "if (!a) b" */
{
TREE_OPERAND (expr, 0) = invert_truthvalue (TREE_OPERAND (expr, 0));
ret = gimplify_expr (&TREE_OPERAND (expr, 0), pre_p, NULL,
is_gimple_condexpr, fb_rvalue);
tmp = TREE_OPERAND (expr, 1);
TREE_OPERAND (expr, 1) = TREE_OPERAND (expr, 2);
TREE_OPERAND (expr, 2) = tmp;
}
else
/* Both arms are empty; replace the COND_EXPR with its predicate. */
expr = TREE_OPERAND (expr, 0);
*expr_p = expr;
return ret;
}
/* A subroutine of gimplify_modify_expr. Replace a MODIFY_EXPR with
a call to __builtin_memcpy. */
static enum gimplify_status
gimplify_modify_expr_to_memcpy (tree *expr_p, tree size, bool want_value)
{
tree args, t, to, to_ptr, from;
to = TREE_OPERAND (*expr_p, 0);
from = TREE_OPERAND (*expr_p, 1);
args = tree_cons (NULL, size, NULL);
t = build_fold_addr_expr (from);
args = tree_cons (NULL, t, args);
to_ptr = build_fold_addr_expr (to);
args = tree_cons (NULL, to_ptr, args);
t = implicit_built_in_decls[BUILT_IN_MEMCPY];
t = build_function_call_expr (t, args);
if (want_value)
{
t = build1 (NOP_EXPR, TREE_TYPE (to_ptr), t);
t = build1 (INDIRECT_REF, TREE_TYPE (to), t);
}
*expr_p = t;
return GS_OK;
}
/* A subroutine of gimplify_modify_expr. Replace a MODIFY_EXPR with
a call to __builtin_memset. In this case we know that the RHS is
a CONSTRUCTOR with an empty element list. */
static enum gimplify_status
gimplify_modify_expr_to_memset (tree *expr_p, tree size, bool want_value)
{
tree args, t, to, to_ptr;
to = TREE_OPERAND (*expr_p, 0);
args = tree_cons (NULL, size, NULL);
args = tree_cons (NULL, integer_zero_node, args);
to_ptr = build_fold_addr_expr (to);
args = tree_cons (NULL, to_ptr, args);
t = implicit_built_in_decls[BUILT_IN_MEMSET];
t = build_function_call_expr (t, args);
if (want_value)
{
t = build1 (NOP_EXPR, TREE_TYPE (to_ptr), t);
t = build1 (INDIRECT_REF, TREE_TYPE (to), t);
}
*expr_p = t;
return GS_OK;
}
/* A subroutine of gimplify_init_ctor_preeval. Called via walk_tree,
determine, cautiously, if a CONSTRUCTOR overlaps the lhs of an
assignment. Returns non-null if we detect a potential overlap. */
struct gimplify_init_ctor_preeval_data
{
/* The base decl of the lhs object. May be NULL, in which case we
have to assume the lhs is indirect. */
tree lhs_base_decl;
/* The alias set of the lhs object. */
int lhs_alias_set;
};
static tree
gimplify_init_ctor_preeval_1 (tree *tp, int *walk_subtrees, void *xdata)
{
struct gimplify_init_ctor_preeval_data *data
= (struct gimplify_init_ctor_preeval_data *) xdata;
tree t = *tp;
/* If we find the base object, obviously we have overlap. */
if (data->lhs_base_decl == t)
return t;
/* If the constructor component is indirect, determine if we have a
potential overlap with the lhs. The only bits of information we
have to go on at this point are addressability and alias sets. */
if (TREE_CODE (t) == INDIRECT_REF
&& (!data->lhs_base_decl || TREE_ADDRESSABLE (data->lhs_base_decl))
&& alias_sets_conflict_p (data->lhs_alias_set, get_alias_set (t)))
return t;
if (IS_TYPE_OR_DECL_P (t))
*walk_subtrees = 0;
return NULL;
}
/* A subroutine of gimplify_init_constructor. Pre-evaluate *EXPR_P,
force values that overlap with the lhs (as described by *DATA)
into temporaries. */
static void
gimplify_init_ctor_preeval (tree *expr_p, tree *pre_p, tree *post_p,
struct gimplify_init_ctor_preeval_data *data)
{
enum gimplify_status one;
/* If the value is invariant, then there's nothing to pre-evaluate.
But ensure it doesn't have any side-effects since a SAVE_EXPR is
invariant but has side effects and might contain a reference to
the object we're initializing. */
if (TREE_INVARIANT (*expr_p) && !TREE_SIDE_EFFECTS (*expr_p))
return;
/* If the type has non-trivial constructors, we can't pre-evaluate. */
if (TREE_ADDRESSABLE (TREE_TYPE (*expr_p)))
return;
/* 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);
return;
}
/* We can't preevaluate if the type contains a placeholder. */
if (type_contains_placeholder_p (TREE_TYPE (*expr_p)))
return;
/* Gimplify the constructor element to something appropriate for the rhs
of a MODIFY_EXPR. Given that we know the lhs is an aggregate, we know
the gimplifier will consider this a store to memory. Doing this
gimplification now means that we won't have to deal with complicated
language-specific trees, nor trees like SAVE_EXPR that can induce
exponential search behavior. */
one = gimplify_expr (expr_p, pre_p, post_p, is_gimple_mem_rhs, fb_rvalue);
if (one == GS_ERROR)
{
*expr_p = NULL;
return;
}
/* If we gimplified to a bare decl, we can be sure that it doesn't overlap
with the lhs, since "a = { .x=a }" doesn't make sense. This will
always be true for all scalars, since is_gimple_mem_rhs insists on a
temporary variable for them. */
if (DECL_P (*expr_p))
return;
/* If this is of variable size, we have no choice but to assume it doesn't
overlap since we can't make a temporary for it. */
if (!TREE_CONSTANT (TYPE_SIZE (TREE_TYPE (*expr_p))))
return;
/* Otherwise, we must search for overlap ... */
if (!walk_tree (expr_p, gimplify_init_ctor_preeval_1, data, NULL))
return;
/* ... and if found, force the value into a temporary. */
*expr_p = get_formal_tmp_var (*expr_p, pre_p);
}
/* A subroutine of gimplify_init_ctor_eval. Create a loop for
a RANGE_EXPR in a CONSTRUCTOR for an array.
var = lower;
loop_entry:
object[var] = value;
if (var == upper)
goto loop_exit;
var = var + 1;
goto loop_entry;
loop_exit:
We increment var _after_ the loop exit check because we might otherwise
fail if upper == TYPE_MAX_VALUE (type for upper).
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_range (tree object, tree lower, tree upper,
tree value, tree array_elt_type,
tree *pre_p, bool cleared)
{
tree loop_entry_label, loop_exit_label;
tree var, var_type, cref;
loop_entry_label = create_artificial_label ();
loop_exit_label = create_artificial_label ();
/* Create and initialize the index variable. */
var_type = TREE_TYPE (upper);
var = create_tmp_var (var_type, NULL);
append_to_statement_list (build2 (MODIFY_EXPR, var_type, var, lower), pre_p);
/* Add the loop entry label. */
append_to_statement_list (build1 (LABEL_EXPR,
void_type_node,
loop_entry_label),
pre_p);
/* Build the reference. */
cref = build4 (ARRAY_REF, array_elt_type, unshare_expr (object),
var, NULL_TREE, NULL_TREE);
/* If we are a constructor, just call gimplify_init_ctor_eval to do
the store. Otherwise just assign value to the reference. */
if (TREE_CODE (value) == CONSTRUCTOR)
/* NB we might have to call ourself recursively through
gimplify_init_ctor_eval if the value is a constructor. */
gimplify_init_ctor_eval (cref, CONSTRUCTOR_ELTS (value),
pre_p, cleared);
else
append_to_statement_list (build2 (MODIFY_EXPR, TREE_TYPE (cref),
cref, value),
pre_p);
/* We exit the loop when the index var is equal to the upper bound. */
gimplify_and_add (build3 (COND_EXPR, void_type_node,
build2 (EQ_EXPR, boolean_type_node,
var, upper),
build1 (GOTO_EXPR,
void_type_node,
loop_exit_label),
NULL_TREE),
pre_p);
/* Otherwise, increment the index var... */
append_to_statement_list (build2 (MODIFY_EXPR, var_type, var,
build2 (PLUS_EXPR, var_type, var,
fold_convert (var_type,
integer_one_node))),
pre_p);
/* ...and jump back to the loop entry. */
append_to_statement_list (build1 (GOTO_EXPR,
void_type_node,
loop_entry_label),
pre_p);
/* Add the loop exit label. */
append_to_statement_list (build1 (LABEL_EXPR,
void_type_node,
loop_exit_label),
pre_p);
}
/* 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
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)
{
tree array_elt_type = NULL;
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))
{
tree purpose, value, cref, init;
purpose = TREE_PURPOSE (list);
value = TREE_VALUE (list);
/* NULL values are created above for gimplification errors. */
if (value == NULL)
continue;
if (cleared && initializer_zerop (value))
continue;
/* ??? Here's to hoping the front end fills in all of the indices,
so we don't have to figure out what's missing ourselves. */
gcc_assert (purpose);
/* If we have a RANGE_EXPR, we have to build a loop to assign the
whole range. */
if (TREE_CODE (purpose) == RANGE_EXPR)
{
tree lower = TREE_OPERAND (purpose, 0);
tree upper = TREE_OPERAND (purpose, 1);
/* If the lower bound is equal to upper, just treat it as if
upper was the index. */
if (simple_cst_equal (lower, upper))
purpose = upper;
else
{
gimplify_init_ctor_eval_range (object, lower, upper, value,
array_elt_type, pre_p, cleared);
continue;
}
}
if (array_elt_type)
{
cref = build (ARRAY_REF, array_elt_type, unshare_expr (object),
purpose, NULL_TREE, NULL_TREE);
}
else
cref = build (COMPONENT_REF, TREE_TYPE (purpose),
unshare_expr (object), purpose, NULL_TREE);
/* APPLE LOCAL begin mainline 5119788 */
if (TREE_CODE (value) == CONSTRUCTOR
&& TREE_CODE (TREE_TYPE (value)) != VECTOR_TYPE)
/* APPLE LOCAL end mainline 5119788 */
gimplify_init_ctor_eval (cref, CONSTRUCTOR_ELTS (value),
pre_p, cleared);
else
{
init = build (MODIFY_EXPR, TREE_TYPE (cref), cref, value);
gimplify_and_add (init, pre_p);
}
}
}
/* A subroutine of gimplify_modify_expr. Break out elements of a
CONSTRUCTOR used as an initializer into separate MODIFY_EXPRs.
Note that we still need to clear any elements that don't have explicit
initializers, so if not all elements are initialized we keep the
original MODIFY_EXPR, we just remove all of the constructor elements. */
static enum gimplify_status
gimplify_init_constructor (tree *expr_p, tree *pre_p,
tree *post_p, bool want_value)
{
tree object;
tree ctor = TREE_OPERAND (*expr_p, 1);
tree type = TREE_TYPE (ctor);
enum gimplify_status ret;
tree elt_list;
if (TREE_CODE (ctor) != CONSTRUCTOR)
return GS_UNHANDLED;
ret = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
is_gimple_lvalue, fb_lvalue);
if (ret == GS_ERROR)
return ret;
object = TREE_OPERAND (*expr_p, 0);
elt_list = CONSTRUCTOR_ELTS (ctor);
ret = GS_ALL_DONE;
switch (TREE_CODE (type))
{
case RECORD_TYPE:
case UNION_TYPE:
case QUAL_UNION_TYPE:
case ARRAY_TYPE:
{
struct gimplify_init_ctor_preeval_data preeval_data;
HOST_WIDE_INT num_type_elements, num_ctor_elements;
HOST_WIDE_INT num_nonzero_elements, num_nonconstant_elements;
bool cleared;
/* 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)
break;
categorize_ctor_elements (ctor, &num_nonzero_elements,
&num_nonconstant_elements,
&num_ctor_elements, &cleared);
/* If a const aggregate variable is being initialized, then it
should never be a lose to promote the variable to be static. */
if (num_nonconstant_elements == 0
&& num_nonzero_elements > 1
&& TREE_READONLY (object)
/* APPLE LOCAL begin CW asm blocks */
&& TREE_CODE (object) == VAR_DECL
&& !DECL_IASM_DONT_PROMOTE_TO_STATIC (object))
/* APPLE LOCAL end CW asm blocks */
{
DECL_INITIAL (object) = ctor;
TREE_STATIC (object) = 1;
if (!DECL_NAME (object))
DECL_NAME (object) = create_tmp_var_name ("C");
walk_tree (&DECL_INITIAL (object), force_labels_r, NULL, NULL);
/* ??? C++ doesn't automatically append a .<number> to the
assembler name, and even when it does, it looks a FE private
data structures to figure out what that number should be,
which are not set for this variable. I suppose this is
important for local statics for inline functions, which aren't
"local" in the object file sense. So in order to get a unique
TU-local symbol, we must invoke the lhd version now. */
lhd_set_decl_assembler_name (object);
*expr_p = NULL_TREE;
break;
}
/* 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)
{
HOST_WIDE_INT size = int_size_in_bytes (type);
unsigned int align;
/* ??? We can still get unbounded array types, at least
from the C++ front end. This seems wrong, but attempt
to work around it for now. */
if (size < 0)
{
size = int_size_in_bytes (TREE_TYPE (object));
if (size >= 0)
TREE_TYPE (ctor) = type = TREE_TYPE (object);
}
/* Find the maximum alignment we can assume for the object. */
/* ??? Make use of DECL_OFFSET_ALIGN. */
if (DECL_P (object))
align = DECL_ALIGN (object);
else
align = TYPE_ALIGN (type);
if (size > 0 && !can_move_by_pieces (size, align))
{
tree new = create_tmp_var_raw (type, "C");
gimple_add_tmp_var (new);
TREE_STATIC (new) = 1;
TREE_READONLY (new) = 1;
DECL_INITIAL (new) = ctor;
if (align > DECL_ALIGN (new))
{
DECL_ALIGN (new) = align;
DECL_USER_ALIGN (new) = 1;
}
walk_tree (&DECL_INITIAL (new), force_labels_r, NULL, NULL);
TREE_OPERAND (*expr_p, 1) = new;
/* This is no longer an assignment of a CONSTRUCTOR, but
we still may have processing to do on the LHS. So
pretend we didn't do anything here to let that happen. */
return GS_UNHANDLED;
}
}
/* 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);
/* 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 (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;
object = unshare_expr (object);
gimplify_stmt (expr_p);
append_to_statement_list (*expr_p, pre_p);
}
/* If we have not block cleared the object, or if there are nonzero
elements in the constructor, add assignments to the individual
scalar fields of the object. */
if (!cleared || num_nonzero_elements > 0)
{
preeval_data.lhs_base_decl = get_base_address (object);
if (!DECL_P (preeval_data.lhs_base_decl))
preeval_data.lhs_base_decl = NULL;
preeval_data.lhs_alias_set = get_alias_set (object);
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);
}
*expr_p = NULL_TREE;
}
break;
case COMPLEX_TYPE:
{
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));
}
}
if (r == NULL || i == NULL)
{
tree zero = convert (TREE_TYPE (type), integer_zero_node);
if (r == NULL)
r = zero;
if (i == NULL)
i = zero;
}
/* Complex types have either COMPLEX_CST or COMPLEX_EXPR to
represent creation of a complex value. */
if (TREE_CONSTANT (r) && TREE_CONSTANT (i))
{
ctor = build_complex (type, r, i);
TREE_OPERAND (*expr_p, 1) = ctor;
}
else
{
ctor = build (COMPLEX_EXPR, type, r, i);
TREE_OPERAND (*expr_p, 1) = ctor;
ret = gimplify_expr (&TREE_OPERAND (*expr_p, 1), pre_p, post_p,
rhs_predicate_for (TREE_OPERAND (*expr_p, 0)),
fb_rvalue);
}
}
break;
case VECTOR_TYPE:
/* Go ahead and simplify constant constructors to VECTOR_CST. */
if (TREE_CONSTANT (ctor))
{
tree tem;
/* 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;
if (! tem)
{
TREE_OPERAND (*expr_p, 1) = build_vector (type, elt_list);
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;
}
break;
default:
/* So how did we get a CONSTRUCTOR for a scalar type? */
gcc_unreachable ();
}
if (ret == GS_ERROR)
return GS_ERROR;
else if (want_value)
{
append_to_statement_list (*expr_p, pre_p);
*expr_p = object;
return GS_OK;
}
else
return GS_ALL_DONE;
}
/* 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. */
static enum gimplify_status
gimplify_modify_expr_rhs (tree *expr_p, tree *from_p, tree *to_p, tree *pre_p,
tree *post_p, bool want_value)
{
enum gimplify_status ret = GS_OK;
while (ret != GS_UNHANDLED)
switch (TREE_CODE (*from_p))
{
case INDIRECT_REF:
{
/* If we have code like
*(const A*)(A*)&x
where the type of "x" is a (possibly cv-qualified variant
of "A"), treat the entire expression as identical to "x".
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)
{
*from_p = t;
ret = GS_OK;
}
else
ret = GS_UNHANDLED;
break;
}
case TARGET_EXPR:
{
/* If we are initializing something from a TARGET_EXPR, strip the
TARGET_EXPR and initialize it directly, if possible. This can't
be done if the initializer is void, since that implies that the
temporary is set in some non-trivial way.
??? 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
have any RTL. In that case, I guess we'll need to replace
references somehow. */
tree init = TARGET_EXPR_INITIAL (*from_p);
if (!VOID_TYPE_P (TREE_TYPE (init)))
{
*from_p = init;
ret = GS_OK;
}
else
ret = GS_UNHANDLED;
}
break;
case COMPOUND_EXPR:
/* Remove any COMPOUND_EXPR in the RHS so the following cases will be
caught. */
gimplify_compound_expr (from_p, pre_p, true);
ret = GS_OK;
break;
case CONSTRUCTOR:
/* If we're initializing from a CONSTRUCTOR, break this into
individual MODIFY_EXPRs. */
return gimplify_init_constructor (expr_p, pre_p, post_p, want_value);
case COND_EXPR:
/* If we're assigning to a non-register type, push the assignment
down into the branches. This is mandatory for ADDRESSABLE types,
since we cannot generate temporaries for such, but it saves a
copy in other cases as well. */
if (!is_gimple_reg_type (TREE_TYPE (*from_p)))
{
*expr_p = *from_p;
return gimplify_cond_expr (expr_p, pre_p, post_p, *to_p,
fb_rvalue);
}
else
ret = GS_UNHANDLED;
break;
default:
ret = GS_UNHANDLED;
break;
}
return ret;
}
/* Gimplify the MODIFY_EXPR node pointed by EXPR_P.
modify_expr
: varname '=' rhs
| '*' ID '=' rhs
PRE_P points to the list where side effects that must happen before
*EXPR_P should be stored.
POST_P points to the list where side effects that must happen after
*EXPR_P should be stored.
WANT_VALUE is nonzero iff we want to use the value of this expression
in another expression. */
static enum gimplify_status
gimplify_modify_expr (tree *expr_p, tree *pre_p, tree *post_p, bool want_value)
{
tree *from_p = &TREE_OPERAND (*expr_p, 1);
tree *to_p = &TREE_OPERAND (*expr_p, 0);
enum gimplify_status ret = GS_UNHANDLED;
gcc_assert (TREE_CODE (*expr_p) == MODIFY_EXPR
|| TREE_CODE (*expr_p) == INIT_EXPR);
/* 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);
/* 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,
want_value);
if (ret != GS_UNHANDLED)
return ret;
/* If the value being copied is of variable width, compute the length
of the copy into a WITH_SIZE_EXPR. Note that we need to do this
before gimplifying any of the operands so that we can resolve any
PLACEHOLDER_EXPRs in the size. Also note that the RTL expander uses
the size of the expression to be copied, not of the destination, so
that is what we must here. */
maybe_with_size_expr (from_p);
/* APPLE LOCAL begin 4228828 */
/* For stores to a pointer, keep computation of the address close to the
pointer. Later optimizations should do this; the 'sink' pass in 4.2
does it, but that's not in 4.0. Temporary. */
if (TREE_CODE (*to_p) != INDIRECT_REF)
{
ret = gimplify_expr (to_p, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
if (ret == GS_ERROR)
return ret;
}
/* APPLE LOCAL end 4228828 */
ret = gimplify_expr (from_p, pre_p, post_p,
rhs_predicate_for (*to_p), fb_rvalue);
if (ret == GS_ERROR)
return ret;
/* Now see if the above changed *from_p to something we handle specially. */
ret = gimplify_modify_expr_rhs (expr_p, from_p, to_p, pre_p, post_p,
want_value);
if (ret != GS_UNHANDLED)
return ret;
/* APPLE LOCAL begin 4228828 */
if (TREE_CODE (*to_p) == INDIRECT_REF)
{
ret = gimplify_expr (to_p, pre_p, post_p, is_gimple_lvalue, fb_lvalue);
if (ret == GS_ERROR)
return ret;
}
/* APPLE LOCAL end 4228828 */
/* If we've got a variable sized assignment between two lvalues (i.e. does
not involve a call), then we can make things a bit more straightforward
by converting the assignment to memcpy or memset. */
if (TREE_CODE (*from_p) == WITH_SIZE_EXPR)
{
tree from = TREE_OPERAND (*from_p, 0);
tree size = TREE_OPERAND (*from_p, 1);
if (TREE_CODE (from) == CONSTRUCTOR)
return gimplify_modify_expr_to_memset (expr_p, size, want_value);
if (is_gimple_addressable (from))
{
*from_p = from;
return gimplify_modify_expr_to_memcpy (expr_p, size, 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. */
gcc_assert (TREE_CODE (*to_p) != SSA_NAME);
*to_p = make_ssa_name (*to_p, *expr_p);
}
if (want_value)
{
append_to_statement_list (*expr_p, pre_p);
*expr_p = *to_p;
return GS_OK;
}
return GS_ALL_DONE;
}
/* Gimplify a comparison between two variable-sized objects. Do this
with a call to BUILT_IN_MEMCMP. */
static enum gimplify_status
gimplify_variable_sized_compare (tree *expr_p)
{
tree op0 = TREE_OPERAND (*expr_p, 0);
tree op1 = TREE_OPERAND (*expr_p, 1);
tree args, t, dest;
t = TYPE_SIZE_UNIT (TREE_TYPE (op0));
t = unshare_expr (t);
t = SUBSTITUTE_PLACEHOLDER_IN_EXPR (t, op0);
args = tree_cons (NULL, t, NULL);
t = build_fold_addr_expr (op1);
args = tree_cons (NULL, t, args);
dest = build_fold_addr_expr (op0);
args = tree_cons (NULL, dest, args);
t = implicit_built_in_decls[BUILT_IN_MEMCMP];
t = build_function_call_expr (t, args);
*expr_p
= build (TREE_CODE (*expr_p), TREE_TYPE (*expr_p), t, integer_zero_node);
return GS_OK;
}
/* Gimplify TRUTH_ANDIF_EXPR and TRUTH_ORIF_EXPR expressions. EXPR_P
points to the expression to gimplify.
Expressions of the form 'a && b' are gimplified to:
a && b ? true : false
gimplify_cond_expr will do the rest.
PRE_P points to the list where side effects that must happen before
*EXPR_P should be stored. */
static enum gimplify_status
gimplify_boolean_expr (tree *expr_p)
{
/* Preserve the original type of the expression. */
tree type = TREE_TYPE (*expr_p);
*expr_p = build (COND_EXPR, type, *expr_p,
convert (type, boolean_true_node),
convert (type, boolean_false_node));
return GS_OK;
}
/* Gimplifies an expression sequence. This function gimplifies each
expression and re-writes the original expression with the last
expression of the sequence in GIMPLE form.
PRE_P points to the list where the side effects for all the
expressions in the sequence will be emitted.
WANT_VALUE is true when the result of the last COMPOUND_EXPR is used. */
/* ??? Should rearrange to share the pre-queue with all the indirect
invocations of gimplify_expr. Would probably save on creations
of statement_list nodes. */
static enum gimplify_status
gimplify_compound_expr (tree *expr_p, tree *pre_p, bool want_value)
{
tree t = *expr_p;
do
{
tree *sub_p = &TREE_OPERAND (t, 0);
if (TREE_CODE (*sub_p) == COMPOUND_EXPR)
gimplify_compound_expr (sub_p, pre_p, false);
else
gimplify_stmt (sub_p);
append_to_statement_list (*sub_p, pre_p);
t = TREE_OPERAND (t, 1);
}
while (TREE_CODE (t) == COMPOUND_EXPR);
*expr_p = t;
if (want_value)
return GS_OK;
else
{
gimplify_stmt (expr_p);
return GS_ALL_DONE;
}
}
/* Gimplifies a statement list. These may be created either by an
enlightened front-end, or by shortcut_cond_expr. */
static enum gimplify_status
gimplify_statement_list (tree *expr_p)
{
tree_stmt_iterator i = tsi_start (*expr_p);
while (!tsi_end_p (i))
{
tree t;
gimplify_stmt (tsi_stmt_ptr (i));
t = tsi_stmt (i);
if (t == NULL)
tsi_delink (&i);
else if (TREE_CODE (t) == STATEMENT_LIST)
{
tsi_link_before (&i, t, TSI_SAME_STMT);
tsi_delink (&i);
}
else
tsi_next (&i);
}
return GS_ALL_DONE;
}
/* Gimplify a SAVE_EXPR node. EXPR_P points to the expression to
gimplify. After gimplification, EXPR_P will point to a new temporary
that holds the original value of the SAVE_EXPR node.
PRE_P points to the list where side effects that must happen before
*EXPR_P should be stored. */
static enum gimplify_status
gimplify_save_expr (tree *expr_p, tree *pre_p, tree *post_p)
{
enum gimplify_status ret = GS_ALL_DONE;
tree val;
gcc_assert (TREE_CODE (*expr_p) == SAVE_EXPR);
val = TREE_OPERAND (*expr_p, 0);
/* If the SAVE_EXPR has not been resolved, then evaluate it once. */
if (!SAVE_EXPR_RESOLVED_P (*expr_p))
{
/* The operand may be a void-valued expression such as SAVE_EXPRs
generated by the Java frontend for class initialization. It is
being executed only for its side-effects. */
if (TREE_TYPE (val) == void_type_node)
{
ret = gimplify_expr (&TREE_OPERAND (*expr_p, 0), pre_p, post_p,
is_gimple_stmt, fb_none);
append_to_statement_list (TREE_OPERAND (*expr_p, 0), pre_p);
val = NULL;
}
else
val = get_initialized_tmp_var (val, pre_p, post_p);
TREE_OPERAND (*expr_p, 0) = val;
SAVE_EXPR_RESOLVED_P (*expr_p) = 1;
}
*expr_p = val;
return ret;
}
/* Re-write the ADDR_EXPR node pointed by EXPR_P
unary_expr
: ...
| '&' varname
...
PRE_P points to the list where side effects that must happen before
*EXPR_P should be stored.
POST_P points to the list where side effects that must happen after
*EXPR_P should be stored. */
static enum gimplify_status
gimplify_addr_expr (tree *expr_p, tree *pre_p, tree *post_p)