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/* PRU target specific passes
Copyright (C) 2017-2021 Free Software Foundation, Inc.
Dimitar Dimitrov <dimitar@dinux.eu>
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 3, or (at your
option) any later version.
GCC is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#define IN_TARGET_CODE 1
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "context.h"
#include "tm.h"
#include "alias.h"
#include "symtab.h"
#include "tree.h"
#include "diagnostic-core.h"
#include "function.h"
#include "gimple.h"
#include "gimple-iterator.h"
#include "gimple-walk.h"
#include "gimple-expr.h"
#include "tree-pass.h"
#include "pru-protos.h"
namespace {
/* Scan the tree to ensure that the compiled code by GCC
conforms to the TI ABI specification. If GCC cannot
output a conforming code, raise an error. */
const pass_data pass_data_tiabi_check =
{
GIMPLE_PASS, /* type */
"*tiabi_check", /* name */
OPTGROUP_NONE, /* optinfo_flags */
TV_NONE, /* tv_id */
PROP_gimple_any, /* properties_required */
0, /* properties_provided */
0, /* properties_destroyed */
0, /* todo_flags_start */
0, /* todo_flags_finish */
};
/* Implementation class for the TI ABI compliance-check pass. */
class pass_tiabi_check : public gimple_opt_pass
{
public:
pass_tiabi_check (gcc::context *ctxt)
: gimple_opt_pass (pass_data_tiabi_check, ctxt)
{}
/* opt_pass methods: */
virtual unsigned int execute (function *);
virtual bool gate (function *fun ATTRIBUTE_UNUSED)
{
return pru_current_abi == PRU_ABI_TI;
}
}; // class pass_tiabi_check
/* Return 1 if type TYPE is a pointer to function type or a
structure having a pointer to function type as one of its fields.
Otherwise return 0. */
static bool
chkp_type_has_function_pointer (const_tree type)
{
bool res = false;
if (POINTER_TYPE_P (type) && FUNC_OR_METHOD_TYPE_P (TREE_TYPE (type)))
res = true;
else if (RECORD_OR_UNION_TYPE_P (type))
{
tree field;
for (field = TYPE_FIELDS (type); field; field = DECL_CHAIN (field))
if (TREE_CODE (field) == FIELD_DECL)
res = res || chkp_type_has_function_pointer (TREE_TYPE (field));
}
else if (TREE_CODE (type) == ARRAY_TYPE)
res = chkp_type_has_function_pointer (TREE_TYPE (type));
return res;
}
/* Check the function declaration FNTYPE for TI ABI compatibility. */
static void
chk_function_decl (const_tree fntype, location_t call_location)
{
/* GCC does not check if the RETURN VALUE pointer is NULL,
so do not allow GCC functions with large return values. */
if (!VOID_TYPE_P (TREE_TYPE (fntype))
&& pru_return_in_memory (TREE_TYPE (fntype), fntype))
error_at (call_location,
"large return values not supported with %<-mabi=ti%> option");
/* Check this function's arguments. */
for (tree p = TYPE_ARG_TYPES (fntype); p; p = TREE_CHAIN (p))
{
tree arg_type = TREE_VALUE (p);
if (chkp_type_has_function_pointer (arg_type))
error_at (call_location,
"function pointers not supported with %<-mabi=ti%> option");
}
}
/* Callback for walk_gimple_seq that checks TP tree for TI ABI compliance. */
static tree
check_op_callback (tree *tp, int *walk_subtrees, void *data)
{
struct walk_stmt_info *wi = (struct walk_stmt_info *) data;
if (RECORD_OR_UNION_TYPE_P (*tp) || TREE_CODE (*tp) == ENUMERAL_TYPE)
{
/* Forward declarations have NULL tree type. Skip them. */
if (TREE_TYPE (*tp) == NULL)
return NULL;
}
/* TODO - why C++ leaves INTEGER_TYPE forward declarations around? */
if (TREE_TYPE (*tp) == NULL)
return NULL;
const tree type = TREE_TYPE (*tp);
/* Direct function calls are allowed, obviously. */
gcall *call = dyn_cast <gcall *> (gsi_stmt (wi->gsi));
if (call
&& tp == gimple_call_fn_ptr (call)
&& gimple_call_fndecl (call))
return NULL;
switch (TREE_CODE (type))
{
case FUNCTION_TYPE:
case METHOD_TYPE:
{
/* Note: Do not enforce a small return value. It is safe to
call any TI ABI function from GCC, since GCC will
never pass NULL. */
/* Check arguments for function pointers. */
for (tree p = TYPE_ARG_TYPES (type); p; p = TREE_CHAIN (p))
{
tree arg_type = TREE_VALUE (p);
if (chkp_type_has_function_pointer (arg_type))
error_at (gimple_location (wi->stmt), "function pointers "
"not supported with %<-mabi=ti%> option");
}
break;
}
case RECORD_TYPE:
case UNION_TYPE:
case QUAL_UNION_TYPE:
case POINTER_TYPE:
{
if (chkp_type_has_function_pointer (type))
{
error_at (gimple_location (wi->stmt),
"function pointers not supported with "
"%<-mabi=ti%> option");
*walk_subtrees = false;
}
break;
}
default:
break;
}
return NULL;
}
/* Pass implementation. */
unsigned
pass_tiabi_check::execute (function *fun)
{
struct walk_stmt_info wi;
const_tree fntype = TREE_TYPE (fun->decl);
gimple_seq body = gimple_body (current_function_decl);
memset (&wi, 0, sizeof (wi));
wi.info = NULL;
wi.want_locations = true;
/* Check the function body. */
walk_gimple_seq (body, NULL, check_op_callback, &wi);
/* Check the function declaration. */
chk_function_decl (fntype, fun->function_start_locus);
return 0;
}
} // anon namespace
gimple_opt_pass *
make_pass_tiabi_check (gcc::context *ctxt)
{
return new pass_tiabi_check (ctxt);
}
/* Register as early as possible. */
void
pru_register_abicheck_pass (void)
{
opt_pass *tiabi_check = make_pass_tiabi_check (g);
struct register_pass_info tiabi_check_info
= { tiabi_check, "*warn_unused_result",
1, PASS_POS_INSERT_AFTER
};
register_pass (&tiabi_check_info);
}
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