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016-07-21 Bernd Edlinger <bernd.edlinger@hotmail.de> 

PR middle-end/71876
        * calls.c (gimple_maybe_alloca_call_p): New function.  Return true
        if STMT may be an alloca call.
        (gimple_alloca_call_p, alloca_call_p): Return only true for the
        builtin alloca call.
        * calls.h (gimple_maybe_alloca_call_p): New function.
        * tree-inline.c (inline_forbidden_p_stmt): Use
        gimple_maybe_alloca_call_p here.

From-SVN: r238605
This commit is contained in:
Bernd Edlinger 2016-07-21 19:06:02 +00:00 committed by Bernd Edlinger
parent df26a50d0d
commit 159e8ef0c6
4 changed files with 50 additions and 6 deletions
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11
gcc/ChangeLog
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@ -1,3 +1,14 @@
2016-07-21 Bernd Edlinger <bernd.edlinger@hotmail.de>
PR middle-end/71876
* calls.c (gimple_maybe_alloca_call_p): New function. Return true
if STMT may be an alloca call.
(gimple_alloca_call_p, alloca_call_p): Return only true for the
builtin alloca call.
* calls.h (gimple_maybe_alloca_call_p): New function.
* tree-inline.c (inline_forbidden_p_stmt): Use
gimple_maybe_alloca_call_p here.
2016-07-21 David Malcolm <dmalcolm@redhat.com>
* spellcheck-tree.c (best_macro_match::best_macro_match):

42
gcc/calls.c
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@ -617,10 +617,10 @@ setjmp_call_p (const_tree fndecl)
}
/* Return true if STMT is an alloca call. */
/* Return true if STMT may be an alloca call. */
bool
gimple_alloca_call_p (const gimple *stmt)
gimple_maybe_alloca_call_p (const gimple *stmt)
{
tree fndecl;
@ -634,7 +634,31 @@ gimple_alloca_call_p (const gimple *stmt)
return false;
}
/* Return true when exp contains alloca call. */
/* Return true if STMT is a builtin alloca call. */
bool
gimple_alloca_call_p (const gimple *stmt)
{
tree fndecl;
if (!is_gimple_call (stmt))
return false;
fndecl = gimple_call_fndecl (stmt);
if (fndecl && DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL)
switch (DECL_FUNCTION_CODE (fndecl))
{
case BUILT_IN_ALLOCA:
case BUILT_IN_ALLOCA_WITH_ALIGN:
return true;
default:
break;
}
return false;
}
/* Return true when exp contains a builtin alloca call. */
bool
alloca_call_p (const_tree exp)
@ -642,8 +666,16 @@ alloca_call_p (const_tree exp)
tree fndecl;
if (TREE_CODE (exp) == CALL_EXPR
&& (fndecl = get_callee_fndecl (exp))
&& (special_function_p (fndecl, 0) & ECF_MAY_BE_ALLOCA))
return true;
&& DECL_BUILT_IN_CLASS (fndecl) == BUILT_IN_NORMAL)
switch (DECL_FUNCTION_CODE (fndecl))
{
case BUILT_IN_ALLOCA:
case BUILT_IN_ALLOCA_WITH_ALIGN:
return true;
default:
break;
}
return false;
}

1
gcc/calls.h
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@ -23,6 +23,7 @@ along with GCC; see the file COPYING3. If not see
extern int flags_from_decl_or_type (const_tree);
extern int call_expr_flags (const_tree);
extern int setjmp_call_p (const_tree);
extern bool gimple_maybe_alloca_call_p (const gimple *);
extern bool gimple_alloca_call_p (const gimple *);
extern bool alloca_call_p (const_tree);
extern bool must_pass_in_stack_var_size (machine_mode, const_tree);

2
gcc/tree-inline.c
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@ -3577,7 +3577,7 @@ inline_forbidden_p_stmt (gimple_stmt_iterator *gsi, bool *handled_ops_p,
RAM instead of 256MB. Don't do so for alloca calls emitted for
VLA objects as those can't cause unbounded growth (they're always
wrapped inside stack_save/stack_restore regions. */
if (gimple_alloca_call_p (stmt)
if (gimple_maybe_alloca_call_p (stmt)
&& !gimple_call_alloca_for_var_p (as_a <gcall *> (stmt))
&& !lookup_attribute ("always_inline", DECL_ATTRIBUTES (fn)))
{