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gimple.h: Move some prototypes to gimple-expr.h and add to include list. 

* gimple.h: Move some prototypes to gimple-expr.h and add to include
	list.
	(extract_ops_from_tree, gimple_call_addr_fndecl, is_gimple_reg_type):
	Move to gimple-expr.h.
	* gimple-expr.h: New file.  Relocate some prototypes from gimple.h.
	(types_compatible_p, is_gimple_reg_type, is_gimple_variable,
	is_gimple_id, virtual_operand_p, is_gimple_addressable,
	is_gimple_constant, extract_ops_from_tree, gimple_call_addr_fndecl):
	Relocate here.
	* gimple.c (extract_ops_from_tree_1, gimple_cond_get_ops_from_tree,
	gimple_set_body, gimple_body, gimple_has_body_p, is_gimple_lvalue,
	is_gimple_condexpr, is_gimple_addressable, is_gimple_constant,
	is_gimple_address, is_gimple_invariant_address,
	is_gimple_ip_invariant_address, is_gimple_min_invariant,
	is_gimple_ip_invariant, is_gimple_variable, is_gimple_id,
	virtual_operand_p, is_gimple_reg, is_gimple_val, is_gimple_asm_val,
	is_gimple_min_lval, is_gimple_call_addr, is_gimple_mem_ref_addr,
	gimple_decl_printable_name, useless_type_conversion_p,
	types_compatible_p, gimple_can_coalesce_p, copy_var_decl): Move to 
	gimple-expr.[ch].
	* gimple-expr.c: New File.
	(useless_type_conversion_p, gimple_set_body, gimple_body,
	gimple_has_body_p, gimple_decl_printable_name, copy_var_decl,
	gimple_can_coalesce_p, extract_ops_from_tree_1, 
	gimple_cond_get_ops_from_tree, is_gimple_lvalue, is_gimple_condexpr,
	is_gimple_address, is_gimple_invariant_address,
	is_gimple_ip_invariant_address, is_gimple_min_invariant,
	is_gimple_ip_invariant, is_gimple_reg, is_gimple_val,
	is_gimple_asm_val, is_gimple_min_lval, is_gimple_call_addr,
	is_gimple_mem_ref_addr): Relocate here.
	* Makefile.in (OBJS): Add gimple-expr.o.

From-SVN: r204412
This commit is contained in:
Andrew MacLeod 2013-11-05 19:26:07 +00:00 committed by Andrew Macleod
parent c180e49596
commit 2a0603f189
6 changed files with 928 additions and 867 deletions
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34
gcc/ChangeLog
View File

@ -1,3 +1,37 @@
2013-11-05 Andrew MacLeod <amacleod@redhat.com>
* gimple.h: Move some prototypes to gimple-expr.h and add to include
list.
(extract_ops_from_tree, gimple_call_addr_fndecl, is_gimple_reg_type):
Move to gimple-expr.h.
* gimple-expr.h: New file. Relocate some prototypes from gimple.h.
(types_compatible_p, is_gimple_reg_type, is_gimple_variable,
is_gimple_id, virtual_operand_p, is_gimple_addressable,
is_gimple_constant, extract_ops_from_tree, gimple_call_addr_fndecl):
Relocate here.
* gimple.c (extract_ops_from_tree_1, gimple_cond_get_ops_from_tree,
gimple_set_body, gimple_body, gimple_has_body_p, is_gimple_lvalue,
is_gimple_condexpr, is_gimple_addressable, is_gimple_constant,
is_gimple_address, is_gimple_invariant_address,
is_gimple_ip_invariant_address, is_gimple_min_invariant,
is_gimple_ip_invariant, is_gimple_variable, is_gimple_id,
virtual_operand_p, is_gimple_reg, is_gimple_val, is_gimple_asm_val,
is_gimple_min_lval, is_gimple_call_addr, is_gimple_mem_ref_addr,
gimple_decl_printable_name, useless_type_conversion_p,
types_compatible_p, gimple_can_coalesce_p, copy_var_decl): Move to
gimple-expr.[ch].
* gimple-expr.c: New File.
(useless_type_conversion_p, gimple_set_body, gimple_body,
gimple_has_body_p, gimple_decl_printable_name, copy_var_decl,
gimple_can_coalesce_p, extract_ops_from_tree_1,
gimple_cond_get_ops_from_tree, is_gimple_lvalue, is_gimple_condexpr,
is_gimple_address, is_gimple_invariant_address,
is_gimple_ip_invariant_address, is_gimple_min_invariant,
is_gimple_ip_invariant, is_gimple_reg, is_gimple_val,
is_gimple_asm_val, is_gimple_min_lval, is_gimple_call_addr,
is_gimple_mem_ref_addr): Relocate here.
* Makefile.in (OBJS): Add gimple-expr.o.
2013-11-05 David Malcolm <dmalcolm@redhat.com>
* gengtype-parse.c (struct_field_seq): Support empty structs.

1
gcc/Makefile.in
View File

@ -1230,6 +1230,7 @@ OBJS = \
ggc-common.o \
gimple.o \
gimple-builder.o \
gimple-expr.o \
gimple-iterator.o \
gimple-fold.o \
gimple-low.o \

721
gcc/gimple-expr.c Normal file
View File

@ -0,0 +1,721 @@
/* Gimple decl, type, and expression support functions.
Copyright (C) 2007-2013 Free Software Foundation, Inc.
Contributed by Aldy Hernandez <aldyh@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 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/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "tree.h"
#include "gimple.h"
#include "demangle.h"
/* ----- Type related ----- */
/* Return true if the conversion from INNER_TYPE to OUTER_TYPE is a
useless type conversion, otherwise return false.
This function implicitly defines the middle-end type system. With
the notion of 'a < b' meaning that useless_type_conversion_p (a, b)
holds and 'a > b' meaning that useless_type_conversion_p (b, a) holds,
the following invariants shall be fulfilled:
1) useless_type_conversion_p is transitive.
If a < b and b < c then a < c.
2) useless_type_conversion_p is not symmetric.
From a < b does not follow a > b.
3) Types define the available set of operations applicable to values.
A type conversion is useless if the operations for the target type
is a subset of the operations for the source type. For example
casts to void* are useless, casts from void* are not (void* can't
be dereferenced or offsetted, but copied, hence its set of operations
is a strict subset of that of all other data pointer types). Casts
to const T* are useless (can't be written to), casts from const T*
to T* are not. */
bool
useless_type_conversion_p (tree outer_type, tree inner_type)
{
/* Do the following before stripping toplevel qualifiers. */
if (POINTER_TYPE_P (inner_type)
&& POINTER_TYPE_P (outer_type))
{
/* Do not lose casts between pointers to different address spaces. */
if (TYPE_ADDR_SPACE (TREE_TYPE (outer_type))
!= TYPE_ADDR_SPACE (TREE_TYPE (inner_type)))
return false;
}
/* From now on qualifiers on value types do not matter. */
inner_type = TYPE_MAIN_VARIANT (inner_type);
outer_type = TYPE_MAIN_VARIANT (outer_type);
if (inner_type == outer_type)
return true;
/* If we know the canonical types, compare them. */
if (TYPE_CANONICAL (inner_type)
&& TYPE_CANONICAL (inner_type) == TYPE_CANONICAL (outer_type))
return true;
/* Changes in machine mode are never useless conversions unless we
deal with aggregate types in which case we defer to later checks. */
if (TYPE_MODE (inner_type) != TYPE_MODE (outer_type)
&& !AGGREGATE_TYPE_P (inner_type))
return false;
/* If both the inner and outer types are integral types, then the
conversion is not necessary if they have the same mode and
signedness and precision, and both or neither are boolean. */
if (INTEGRAL_TYPE_P (inner_type)
&& INTEGRAL_TYPE_P (outer_type))
{
/* Preserve changes in signedness or precision. */
if (TYPE_UNSIGNED (inner_type) != TYPE_UNSIGNED (outer_type)
|| TYPE_PRECISION (inner_type) != TYPE_PRECISION (outer_type))
return false;
/* Preserve conversions to/from BOOLEAN_TYPE if types are not
of precision one. */
if (((TREE_CODE (inner_type) == BOOLEAN_TYPE)
!= (TREE_CODE (outer_type) == BOOLEAN_TYPE))
&& TYPE_PRECISION (outer_type) != 1)
return false;
/* We don't need to preserve changes in the types minimum or
maximum value in general as these do not generate code
unless the types precisions are different. */
return true;
}
/* Scalar floating point types with the same mode are compatible. */
else if (SCALAR_FLOAT_TYPE_P (inner_type)
&& SCALAR_FLOAT_TYPE_P (outer_type))
return true;
/* Fixed point types with the same mode are compatible. */
else if (FIXED_POINT_TYPE_P (inner_type)
&& FIXED_POINT_TYPE_P (outer_type))
return true;
/* We need to take special care recursing to pointed-to types. */
else if (POINTER_TYPE_P (inner_type)
&& POINTER_TYPE_P (outer_type))
{
/* Do not lose casts to function pointer types. */
if ((TREE_CODE (TREE_TYPE (outer_type)) == FUNCTION_TYPE
|| TREE_CODE (TREE_TYPE (outer_type)) == METHOD_TYPE)
&& !(TREE_CODE (TREE_TYPE (inner_type)) == FUNCTION_TYPE
|| TREE_CODE (TREE_TYPE (inner_type)) == METHOD_TYPE))
return false;
/* We do not care for const qualification of the pointed-to types
as const qualification has no semantic value to the middle-end. */
/* Otherwise pointers/references are equivalent. */
return true;
}
/* Recurse for complex types. */
else if (TREE_CODE (inner_type) == COMPLEX_TYPE
&& TREE_CODE (outer_type) == COMPLEX_TYPE)
return useless_type_conversion_p (TREE_TYPE (outer_type),
TREE_TYPE (inner_type));
/* Recurse for vector types with the same number of subparts. */
else if (TREE_CODE (inner_type) == VECTOR_TYPE
&& TREE_CODE (outer_type) == VECTOR_TYPE
&& TYPE_PRECISION (inner_type) == TYPE_PRECISION (outer_type))
return useless_type_conversion_p (TREE_TYPE (outer_type),
TREE_TYPE (inner_type));
else if (TREE_CODE (inner_type) == ARRAY_TYPE
&& TREE_CODE (outer_type) == ARRAY_TYPE)
{
/* Preserve string attributes. */
if (TYPE_STRING_FLAG (inner_type) != TYPE_STRING_FLAG (outer_type))
return false;
/* Conversions from array types with unknown extent to
array types with known extent are not useless. */
if (!TYPE_DOMAIN (inner_type)
&& TYPE_DOMAIN (outer_type))
return false;
/* Nor are conversions from array types with non-constant size to
array types with constant size or to different size. */
if (TYPE_SIZE (outer_type)
&& TREE_CODE (TYPE_SIZE (outer_type)) == INTEGER_CST
&& (!TYPE_SIZE (inner_type)
|| TREE_CODE (TYPE_SIZE (inner_type)) != INTEGER_CST
|| !tree_int_cst_equal (TYPE_SIZE (outer_type),
TYPE_SIZE (inner_type))))
return false;
/* Check conversions between arrays with partially known extents.
If the array min/max values are constant they have to match.
Otherwise allow conversions to unknown and variable extents.
In particular this declares conversions that may change the
mode to BLKmode as useless. */
if (TYPE_DOMAIN (inner_type)
&& TYPE_DOMAIN (outer_type)
&& TYPE_DOMAIN (inner_type) != TYPE_DOMAIN (outer_type))
{
tree inner_min = TYPE_MIN_VALUE (TYPE_DOMAIN (inner_type));
tree outer_min = TYPE_MIN_VALUE (TYPE_DOMAIN (outer_type));
tree inner_max = TYPE_MAX_VALUE (TYPE_DOMAIN (inner_type));
tree outer_max = TYPE_MAX_VALUE (TYPE_DOMAIN (outer_type));
/* After gimplification a variable min/max value carries no
additional information compared to a NULL value. All that
matters has been lowered to be part of the IL. */
if (inner_min && TREE_CODE (inner_min) != INTEGER_CST)
inner_min = NULL_TREE;
if (outer_min && TREE_CODE (outer_min) != INTEGER_CST)
outer_min = NULL_TREE;
if (inner_max && TREE_CODE (inner_max) != INTEGER_CST)
inner_max = NULL_TREE;
if (outer_max && TREE_CODE (outer_max) != INTEGER_CST)
outer_max = NULL_TREE;
/* Conversions NULL / variable <- cst are useless, but not
the other way around. */
if (outer_min
&& (!inner_min
|| !tree_int_cst_equal (inner_min, outer_min)))
return false;
if (outer_max
&& (!inner_max
|| !tree_int_cst_equal (inner_max, outer_max)))
return false;
}
/* Recurse on the element check. */
return useless_type_conversion_p (TREE_TYPE (outer_type),
TREE_TYPE (inner_type));
}
else if ((TREE_CODE (inner_type) == FUNCTION_TYPE
|| TREE_CODE (inner_type) == METHOD_TYPE)
&& TREE_CODE (inner_type) == TREE_CODE (outer_type))
{
tree outer_parm, inner_parm;
/* If the return types are not compatible bail out. */
if (!useless_type_conversion_p (TREE_TYPE (outer_type),
TREE_TYPE (inner_type)))
return false;
/* Method types should belong to a compatible base class. */
if (TREE_CODE (inner_type) == METHOD_TYPE
&& !useless_type_conversion_p (TYPE_METHOD_BASETYPE (outer_type),
TYPE_METHOD_BASETYPE (inner_type)))
return false;
/* A conversion to an unprototyped argument list is ok. */
if (!prototype_p (outer_type))
return true;
/* If the unqualified argument types are compatible the conversion
is useless. */
if (TYPE_ARG_TYPES (outer_type) == TYPE_ARG_TYPES (inner_type))
return true;
for (outer_parm = TYPE_ARG_TYPES (outer_type),
inner_parm = TYPE_ARG_TYPES (inner_type);
outer_parm && inner_parm;
outer_parm = TREE_CHAIN (outer_parm),
inner_parm = TREE_CHAIN (inner_parm))
if (!useless_type_conversion_p
(TYPE_MAIN_VARIANT (TREE_VALUE (outer_parm)),
TYPE_MAIN_VARIANT (TREE_VALUE (inner_parm))))
return false;
/* If there is a mismatch in the number of arguments the functions
are not compatible. */
if (outer_parm || inner_parm)
return false;
/* Defer to the target if necessary. */
if (TYPE_ATTRIBUTES (inner_type) || TYPE_ATTRIBUTES (outer_type))
return comp_type_attributes (outer_type, inner_type) != 0;
return true;
}
/* For aggregates we rely on TYPE_CANONICAL exclusively and require
explicit conversions for types involving to be structurally
compared types. */
else if (AGGREGATE_TYPE_P (inner_type)
&& TREE_CODE (inner_type) == TREE_CODE (outer_type))
return false;
return false;
}
/* ----- Decl related ----- */
/* Set sequence SEQ to be the GIMPLE body for function FN. */
void
gimple_set_body (tree fndecl, gimple_seq seq)
{
struct function *fn = DECL_STRUCT_FUNCTION (fndecl);
if (fn == NULL)
{
/* If FNDECL still does not have a function structure associated
with it, then it does not make sense for it to receive a
GIMPLE body. */
gcc_assert (seq == NULL);
}
else
fn->gimple_body = seq;
}
/* Return the body of GIMPLE statements for function FN. After the
CFG pass, the function body doesn't exist anymore because it has
been split up into basic blocks. In this case, it returns
NULL. */
gimple_seq
gimple_body (tree fndecl)
{
struct function *fn = DECL_STRUCT_FUNCTION (fndecl);
return fn ? fn->gimple_body : NULL;
}
/* Return true when FNDECL has Gimple body either in unlowered
or CFG form. */
bool
gimple_has_body_p (tree fndecl)
{
struct function *fn = DECL_STRUCT_FUNCTION (fndecl);
return (gimple_body (fndecl) || (fn && fn->cfg));
}
/* Return a printable name for symbol DECL. */
const char *
gimple_decl_printable_name (tree decl, int verbosity)
{
if (!DECL_NAME (decl))
return NULL;
if (DECL_ASSEMBLER_NAME_SET_P (decl))
{
const char *str, *mangled_str;
int dmgl_opts = DMGL_NO_OPTS;
if (verbosity >= 2)
{
dmgl_opts = DMGL_VERBOSE
| DMGL_ANSI
| DMGL_GNU_V3
| DMGL_RET_POSTFIX;
if (TREE_CODE (decl) == FUNCTION_DECL)
dmgl_opts |= DMGL_PARAMS;
}
mangled_str = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
str = cplus_demangle_v3 (mangled_str, dmgl_opts);
return (str) ? str : mangled_str;
}
return IDENTIFIER_POINTER (DECL_NAME (decl));
}
/* Create a new VAR_DECL and copy information from VAR to it. */
tree
copy_var_decl (tree var, tree name, tree type)
{
tree copy = build_decl (DECL_SOURCE_LOCATION (var), VAR_DECL, name, type);
TREE_ADDRESSABLE (copy) = TREE_ADDRESSABLE (var);
TREE_THIS_VOLATILE (copy) = TREE_THIS_VOLATILE (var);
DECL_GIMPLE_REG_P (copy) = DECL_GIMPLE_REG_P (var);
DECL_ARTIFICIAL (copy) = DECL_ARTIFICIAL (var);
DECL_IGNORED_P (copy) = DECL_IGNORED_P (var);
DECL_CONTEXT (copy) = DECL_CONTEXT (var);
TREE_NO_WARNING (copy) = TREE_NO_WARNING (var);
TREE_USED (copy) = 1;
DECL_SEEN_IN_BIND_EXPR_P (copy) = 1;
DECL_ATTRIBUTES (copy) = DECL_ATTRIBUTES (var);
return copy;
}
/* Given SSA_NAMEs NAME1 and NAME2, return true if they are candidates for
coalescing together, false otherwise.
This must stay consistent with var_map_base_init in tree-ssa-live.c. */
bool
gimple_can_coalesce_p (tree name1, tree name2)
{
/* First check the SSA_NAME's associated DECL. We only want to
coalesce if they have the same DECL or both have no associated DECL. */
tree var1 = SSA_NAME_VAR (name1);
tree var2 = SSA_NAME_VAR (name2);
var1 = (var1 && (!VAR_P (var1) || !DECL_IGNORED_P (var1))) ? var1 : NULL_TREE;
var2 = (var2 && (!VAR_P (var2) || !DECL_IGNORED_P (var2))) ? var2 : NULL_TREE;
if (var1 != var2)
return false;
/* Now check the types. If the types are the same, then we should
try to coalesce V1 and V2. */
tree t1 = TREE_TYPE (name1);
tree t2 = TREE_TYPE (name2);
if (t1 == t2)
return true;
/* If the types are not the same, check for a canonical type match. This
(for example) allows coalescing when the types are fundamentally the
same, but just have different names.
Note pointer types with different address spaces may have the same
canonical type. Those are rejected for coalescing by the
types_compatible_p check. */
if (TYPE_CANONICAL (t1)
&& TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2)
&& types_compatible_p (t1, t2))
return true;
return false;
}
/* ----- Expression related ----- */
/* Extract the operands and code for expression EXPR into *SUBCODE_P,
*OP1_P, *OP2_P and *OP3_P respectively. */
void
extract_ops_from_tree_1 (tree expr, enum tree_code *subcode_p, tree *op1_p,
tree *op2_p, tree *op3_p)
{
enum gimple_rhs_class grhs_class;
*subcode_p = TREE_CODE (expr);
grhs_class = get_gimple_rhs_class (*subcode_p);
if (grhs_class == GIMPLE_TERNARY_RHS)
{
*op1_p = TREE_OPERAND (expr, 0);
*op2_p = TREE_OPERAND (expr, 1);
*op3_p = TREE_OPERAND (expr, 2);
}
else if (grhs_class == GIMPLE_BINARY_RHS)
{
*op1_p = TREE_OPERAND (expr, 0);
*op2_p = TREE_OPERAND (expr, 1);
*op3_p = NULL_TREE;
}
else if (grhs_class == GIMPLE_UNARY_RHS)
{
*op1_p = TREE_OPERAND (expr, 0);
*op2_p = NULL_TREE;
*op3_p = NULL_TREE;
}
else if (grhs_class == GIMPLE_SINGLE_RHS)
{
*op1_p = expr;
*op2_p = NULL_TREE;
*op3_p = NULL_TREE;
}
else
gcc_unreachable ();
}
/* Extract operands for a GIMPLE_COND statement out of COND_EXPR tree COND. */
void
gimple_cond_get_ops_from_tree (tree cond, enum tree_code *code_p,
tree *lhs_p, tree *rhs_p)
{
gcc_assert (TREE_CODE_CLASS (TREE_CODE (cond)) == tcc_comparison
|| TREE_CODE (cond) == TRUTH_NOT_EXPR
|| is_gimple_min_invariant (cond)
|| SSA_VAR_P (cond));
extract_ops_from_tree (cond, code_p, lhs_p, rhs_p);
/* Canonicalize conditionals of the form 'if (!VAL)'. */
if (*code_p == TRUTH_NOT_EXPR)
{
*code_p = EQ_EXPR;
gcc_assert (*lhs_p && *rhs_p == NULL_TREE);
*rhs_p = build_zero_cst (TREE_TYPE (*lhs_p));
}
/* Canonicalize conditionals of the form 'if (VAL)' */
else if (TREE_CODE_CLASS (*code_p) != tcc_comparison)
{
*code_p = NE_EXPR;
gcc_assert (*lhs_p && *rhs_p == NULL_TREE);
*rhs_p = build_zero_cst (TREE_TYPE (*lhs_p));
}
}
/* Return true if T is a valid LHS for a GIMPLE assignment expression. */
bool
is_gimple_lvalue (tree t)
{
return (is_gimple_addressable (t)
|| TREE_CODE (t) == WITH_SIZE_EXPR
/* These are complex lvalues, but don't have addresses, so they
go here. */
|| TREE_CODE (t) == BIT_FIELD_REF);
}
/* Return true if T is a GIMPLE condition. */
bool
is_gimple_condexpr (tree t)
{
return (is_gimple_val (t) || (COMPARISON_CLASS_P (t)
&& !tree_could_throw_p (t)
&& is_gimple_val (TREE_OPERAND (t, 0))
&& is_gimple_val (TREE_OPERAND (t, 1))));
}
/* Return true if T is a gimple address. */
bool
is_gimple_address (const_tree t)
{
tree op;
if (TREE_CODE (t) != ADDR_EXPR)
return false;
op = TREE_OPERAND (t, 0);
while (handled_component_p (op))
{
if ((TREE_CODE (op) == ARRAY_REF
|| TREE_CODE (op) == ARRAY_RANGE_REF)
&& !is_gimple_val (TREE_OPERAND (op, 1)))
return false;
op = TREE_OPERAND (op, 0);
}
if (CONSTANT_CLASS_P (op) || TREE_CODE (op) == MEM_REF)
return true;
switch (TREE_CODE (op))
{
case PARM_DECL:
case RESULT_DECL:
case LABEL_DECL:
case FUNCTION_DECL:
case VAR_DECL:
case CONST_DECL:
return true;
default:
return false;
}
}
/* Return true if T is a gimple invariant address. */
bool
is_gimple_invariant_address (const_tree t)
{
const_tree op;
if (TREE_CODE (t) != ADDR_EXPR)
return false;
op = strip_invariant_refs (TREE_OPERAND (t, 0));
if (!op)
return false;
if (TREE_CODE (op) == MEM_REF)
{
const_tree op0 = TREE_OPERAND (op, 0);
return (TREE_CODE (op0) == ADDR_EXPR
&& (CONSTANT_CLASS_P (TREE_OPERAND (op0, 0))
|| decl_address_invariant_p (TREE_OPERAND (op0, 0))));
}
return CONSTANT_CLASS_P (op) || decl_address_invariant_p (op);
}
/* Return true if T is a gimple invariant address at IPA level
(so addresses of variables on stack are not allowed). */
bool
is_gimple_ip_invariant_address (const_tree t)
{
const_tree op;
if (TREE_CODE (t) != ADDR_EXPR)
return false;
op = strip_invariant_refs (TREE_OPERAND (t, 0));
if (!op)
return false;
if (TREE_CODE (op) == MEM_REF)
{
const_tree op0 = TREE_OPERAND (op, 0);
return (TREE_CODE (op0) == ADDR_EXPR
&& (CONSTANT_CLASS_P (TREE_OPERAND (op0, 0))
|| decl_address_ip_invariant_p (TREE_OPERAND (op0, 0))));
}
return CONSTANT_CLASS_P (op) || decl_address_ip_invariant_p (op);
}
/* Return true if T is a GIMPLE minimal invariant. It's a restricted
form of function invariant. */
bool
is_gimple_min_invariant (const_tree t)
{
if (TREE_CODE (t) == ADDR_EXPR)
return is_gimple_invariant_address (t);
return is_gimple_constant (t);
}
/* Return true if T is a GIMPLE interprocedural invariant. It's a restricted
form of gimple minimal invariant. */
bool
is_gimple_ip_invariant (const_tree t)
{
if (TREE_CODE (t) == ADDR_EXPR)
return is_gimple_ip_invariant_address (t);
return is_gimple_constant (t);
}
/* Return true if T is a non-aggregate register variable. */
bool
is_gimple_reg (tree t)
{
if (virtual_operand_p (t))
return false;
if (TREE_CODE (t) == SSA_NAME)
return true;
if (!is_gimple_variable (t))
return false;
if (!is_gimple_reg_type (TREE_TYPE (t)))
return false;
/* A volatile decl is not acceptable because we can't reuse it as
needed. We need to copy it into a temp first. */
if (TREE_THIS_VOLATILE (t))
return false;
/* We define "registers" as things that can be renamed as needed,
which with our infrastructure does not apply to memory. */
if (needs_to_live_in_memory (t))
return false;
/* Hard register variables are an interesting case. For those that
are call-clobbered, we don't know where all the calls are, since
we don't (want to) take into account which operations will turn
into libcalls at the rtl level. For those that are call-saved,
we don't currently model the fact that calls may in fact change
global hard registers, nor do we examine ASM_CLOBBERS at the tree
level, and so miss variable changes that might imply. All around,
it seems safest to not do too much optimization with these at the
tree level at all. We'll have to rely on the rtl optimizers to
clean this up, as there we've got all the appropriate bits exposed. */
if (TREE_CODE (t) == VAR_DECL && DECL_HARD_REGISTER (t))
return false;
/* Complex and vector values must have been put into SSA-like form.
That is, no assignments to the individual components. */
if (TREE_CODE (TREE_TYPE (t)) == COMPLEX_TYPE
|| TREE_CODE (TREE_TYPE (t)) == VECTOR_TYPE)
return DECL_GIMPLE_REG_P (t);
return true;
}
/* Return true if T is a GIMPLE rvalue, i.e. an identifier or a constant. */
bool
is_gimple_val (tree t)
{
/* Make loads from volatiles and memory vars explicit. */
if (is_gimple_variable (t)
&& is_gimple_reg_type (TREE_TYPE (t))
&& !is_gimple_reg (t))
return false;
return (is_gimple_variable (t) || is_gimple_min_invariant (t));
}
/* Similarly, but accept hard registers as inputs to asm statements. */
bool
is_gimple_asm_val (tree t)
{
if (TREE_CODE (t) == VAR_DECL && DECL_HARD_REGISTER (t))
return true;
return is_gimple_val (t);
}
/* Return true if T is a GIMPLE minimal lvalue. */
bool
is_gimple_min_lval (tree t)
{
if (!(t = CONST_CAST_TREE (strip_invariant_refs (t))))
return false;
return (is_gimple_id (t) || TREE_CODE (t) == MEM_REF);
}
/* Return true if T is a valid function operand of a CALL_EXPR. */
bool
is_gimple_call_addr (tree t)
{
return (TREE_CODE (t) == OBJ_TYPE_REF || is_gimple_val (t));
}
/* Return true if T is a valid address operand of a MEM_REF. */
bool
is_gimple_mem_ref_addr (tree t)
{
return (is_gimple_reg (t)
|| TREE_CODE (t) == INTEGER_CST
|| (TREE_CODE (t) == ADDR_EXPR
&& (CONSTANT_CLASS_P (TREE_OPERAND (t, 0))
|| decl_address_invariant_p (TREE_OPERAND (t, 0)))));
}

171
gcc/gimple-expr.h Normal file
View File

@ -0,0 +1,171 @@
/* Header file for gimple decl, type and expressions.
Copyright (C) 2013 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#ifndef GCC_GIMPLE_EXPR_H
#define GCC_GIMPLE_EXPR_H
extern bool useless_type_conversion_p (tree, tree);
extern void gimple_set_body (tree, gimple_seq);
extern gimple_seq gimple_body (tree);
extern bool gimple_has_body_p (tree);
extern const char *gimple_decl_printable_name (tree, int);
extern tree copy_var_decl (tree, tree, tree);
extern bool gimple_can_coalesce_p (tree, tree);
extern void extract_ops_from_tree_1 (tree, enum tree_code *, tree *, tree *,
tree *);
extern void gimple_cond_get_ops_from_tree (tree, enum tree_code *, tree *,
tree *);
extern bool is_gimple_lvalue (tree);
extern bool is_gimple_condexpr (tree);
extern bool is_gimple_address (const_tree);
extern bool is_gimple_invariant_address (const_tree);
extern bool is_gimple_ip_invariant_address (const_tree);
extern bool is_gimple_min_invariant (const_tree);
extern bool is_gimple_ip_invariant (const_tree);
extern bool is_gimple_reg (tree);
extern bool is_gimple_val (tree);
extern bool is_gimple_asm_val (tree);
extern bool is_gimple_min_lval (tree);
extern bool is_gimple_call_addr (tree);
extern bool is_gimple_mem_ref_addr (tree);
/* Return true if a conversion from either type of TYPE1 and TYPE2
to the other is not required. Otherwise return false. */
static inline bool
types_compatible_p (tree type1, tree type2)
{
return (type1 == type2
|| (useless_type_conversion_p (type1, type2)
&& useless_type_conversion_p (type2, type1)));
}
/* Return true if TYPE is a suitable type for a scalar register variable. */
static inline bool
is_gimple_reg_type (tree type)
{
return !AGGREGATE_TYPE_P (type);
}
/* Return true if T is a variable. */
static inline bool
is_gimple_variable (tree t)
{
return (TREE_CODE (t) == VAR_DECL
|| TREE_CODE (t) == PARM_DECL
|| TREE_CODE (t) == RESULT_DECL
|| TREE_CODE (t) == SSA_NAME);
}
/* Return true if T is a GIMPLE identifier (something with an address). */
static inline bool
is_gimple_id (tree t)
{
return (is_gimple_variable (t)
|| TREE_CODE (t) == FUNCTION_DECL
|| TREE_CODE (t) == LABEL_DECL
|| TREE_CODE (t) == CONST_DECL
/* Allow string constants, since they are addressable. */
|| TREE_CODE (t) == STRING_CST);
}
/* Return true if OP, an SSA name or a DECL is a virtual operand. */
static inline bool
virtual_operand_p (tree op)
{
if (TREE_CODE (op) == SSA_NAME)
{
op = SSA_NAME_VAR (op);
if (!op)
return false;
}
if (TREE_CODE (op) == VAR_DECL)
return VAR_DECL_IS_VIRTUAL_OPERAND (op);
return false;
}
/* Return true if T is something whose address can be taken. */
static inline bool
is_gimple_addressable (tree t)
{
return (is_gimple_id (t) || handled_component_p (t)
|| TREE_CODE (t) == MEM_REF);
}
/* Return true if T is a valid gimple constant. */
static inline bool
is_gimple_constant (const_tree t)
{
switch (TREE_CODE (t))
{
case INTEGER_CST:
case REAL_CST:
case FIXED_CST:
case STRING_CST:
case COMPLEX_CST:
case VECTOR_CST:
return true;
default:
return false;
}
}
/* A wrapper around extract_ops_from_tree_1, for callers which expect
to see only a maximum of two operands. */
static inline void
extract_ops_from_tree (tree expr, enum tree_code *code, tree *op0,
tree *op1)
{
tree op2;
extract_ops_from_tree_1 (expr, code, op0, op1, &op2);
gcc_assert (op2 == NULL_TREE);
}
/* Given a valid GIMPLE_CALL function address return the FUNCTION_DECL
associated with the callee if known. Otherwise return NULL_TREE. */
static inline tree
gimple_call_addr_fndecl (const_tree fn)
{
if (fn && TREE_CODE (fn) == ADDR_EXPR)
{
tree fndecl = TREE_OPERAND (fn, 0);
if (TREE_CODE (fndecl) == MEM_REF
&& TREE_CODE (TREE_OPERAND (fndecl, 0)) == ADDR_EXPR
&& integer_zerop (TREE_OPERAND (fndecl, 1)))
fndecl = TREE_OPERAND (TREE_OPERAND (fndecl, 0), 0);
if (TREE_CODE (fndecl) == FUNCTION_DECL)
return fndecl;
}
return NULL_TREE;
}
#endif /* GCC_GIMPLE_EXPR_H */

776
gcc/gimple.c
View File

@ -386,47 +386,6 @@ gimple_call_get_nobnd_arg_index (const_gimple gs, unsigned index)
}
/* Extract the operands and code for expression EXPR into *SUBCODE_P,
*OP1_P, *OP2_P and *OP3_P respectively. */
void
extract_ops_from_tree_1 (tree expr, enum tree_code *subcode_p, tree *op1_p,
tree *op2_p, tree *op3_p)
{
enum gimple_rhs_class grhs_class;
*subcode_p = TREE_CODE (expr);
grhs_class = get_gimple_rhs_class (*subcode_p);
if (grhs_class == GIMPLE_TERNARY_RHS)
{
*op1_p = TREE_OPERAND (expr, 0);
*op2_p = TREE_OPERAND (expr, 1);
*op3_p = TREE_OPERAND (expr, 2);
}
else if (grhs_class == GIMPLE_BINARY_RHS)
{
*op1_p = TREE_OPERAND (expr, 0);
*op2_p = TREE_OPERAND (expr, 1);
*op3_p = NULL_TREE;
}
else if (grhs_class == GIMPLE_UNARY_RHS)
{
*op1_p = TREE_OPERAND (expr, 0);
*op2_p = NULL_TREE;
*op3_p = NULL_TREE;
}
else if (grhs_class == GIMPLE_SINGLE_RHS)
{
*op1_p = expr;
*op2_p = NULL_TREE;
*op3_p = NULL_TREE;
}
else
gcc_unreachable ();
}
/* Build a GIMPLE_ASSIGN statement.
LHS of the assignment.
@ -526,37 +485,6 @@ gimple_build_cond (enum tree_code pred_code, tree lhs, tree rhs,
return p;
}
/* Extract operands for a GIMPLE_COND statement out of COND_EXPR tree COND. */
void
gimple_cond_get_ops_from_tree (tree cond, enum tree_code *code_p,
tree *lhs_p, tree *rhs_p)
{
gcc_assert (TREE_CODE_CLASS (TREE_CODE (cond)) == tcc_comparison
|| TREE_CODE (cond) == TRUTH_NOT_EXPR
|| is_gimple_min_invariant (cond)
|| SSA_VAR_P (cond));
extract_ops_from_tree (cond, code_p, lhs_p, rhs_p);
/* Canonicalize conditionals of the form 'if (!VAL)'. */
if (*code_p == TRUTH_NOT_EXPR)
{
*code_p = EQ_EXPR;
gcc_assert (*lhs_p && *rhs_p == NULL_TREE);
*rhs_p = build_zero_cst (TREE_TYPE (*lhs_p));
}
/* Canonicalize conditionals of the form 'if (VAL)' */
else if (TREE_CODE_CLASS (*code_p) != tcc_comparison)
{
*code_p = NE_EXPR;
gcc_assert (*lhs_p && *rhs_p == NULL_TREE);
*rhs_p = build_zero_cst (TREE_TYPE (*lhs_p));
}
}
/* Build a GIMPLE_COND statement from the conditional expression tree
COND. T_LABEL and F_LABEL are as in gimple_build_cond. */
@ -1906,45 +1834,6 @@ walk_gimple_stmt (gimple_stmt_iterator *gsi, walk_stmt_fn callback_stmt,
}
/* Set sequence SEQ to be the GIMPLE body for function FN. */
void
gimple_set_body (tree fndecl, gimple_seq seq)
{
struct function *fn = DECL_STRUCT_FUNCTION (fndecl);
if (fn == NULL)
{
/* If FNDECL still does not have a function structure associated
with it, then it does not make sense for it to receive a
GIMPLE body. */
gcc_assert (seq == NULL);
}
else
fn->gimple_body = seq;
}
/* Return the body of GIMPLE statements for function FN. After the
CFG pass, the function body doesn't exist anymore because it has
been split up into basic blocks. In this case, it returns
NULL. */
gimple_seq
gimple_body (tree fndecl)
{
struct function *fn = DECL_STRUCT_FUNCTION (fndecl);
return fn ? fn->gimple_body : NULL;
}
/* Return true when FNDECL has Gimple body either in unlowered
or CFG form. */
bool
gimple_has_body_p (tree fndecl)
{
struct function *fn = DECL_STRUCT_FUNCTION (fndecl);
return (gimple_body (fndecl) || (fn && fn->cfg));
}
/* Return true if calls C1 and C2 are known to go to the same function. */
bool
@ -2602,325 +2491,6 @@ const unsigned char gimple_rhs_class_table[] = {
#undef DEFTREECODE
#undef END_OF_BASE_TREE_CODES
/* For the definitive definition of GIMPLE, see doc/tree-ssa.texi. */
/* Validation of GIMPLE expressions. */
/* Return true if T is a valid LHS for a GIMPLE assignment expression. */
bool
is_gimple_lvalue (tree t)
{
return (is_gimple_addressable (t)
|| TREE_CODE (t) == WITH_SIZE_EXPR
/* These are complex lvalues, but don't have addresses, so they
go here. */
|| TREE_CODE (t) == BIT_FIELD_REF);
}
/* Return true if T is a GIMPLE condition. */
bool
is_gimple_condexpr (tree t)
{
return (is_gimple_val (t) || (COMPARISON_CLASS_P (t)
&& !tree_could_throw_p (t)
&& is_gimple_val (TREE_OPERAND (t, 0))
&& is_gimple_val (TREE_OPERAND (t, 1))));
}
/* Return true if T is something whose address can be taken. */
bool
is_gimple_addressable (tree t)
{
return (is_gimple_id (t) || handled_component_p (t)
|| TREE_CODE (t) == MEM_REF);
}
/* Return true if T is a valid gimple constant. */
bool
is_gimple_constant (const_tree t)
{
switch (TREE_CODE (t))
{
case INTEGER_CST:
case REAL_CST:
case FIXED_CST:
case STRING_CST:
case COMPLEX_CST:
case VECTOR_CST:
return true;
default:
return false;
}
}
/* Return true if T is a gimple address. */
bool
is_gimple_address (const_tree t)
{
tree op;
if (TREE_CODE (t) != ADDR_EXPR)
return false;
op = TREE_OPERAND (t, 0);
while (handled_component_p (op))
{
if ((TREE_CODE (op) == ARRAY_REF
|| TREE_CODE (op) == ARRAY_RANGE_REF)
&& !is_gimple_val (TREE_OPERAND (op, 1)))
return false;
op = TREE_OPERAND (op, 0);
}
if (CONSTANT_CLASS_P (op) || TREE_CODE (op) == MEM_REF)
return true;
switch (TREE_CODE (op))
{
case PARM_DECL:
case RESULT_DECL:
case LABEL_DECL:
case FUNCTION_DECL:
case VAR_DECL:
case CONST_DECL:
return true;
default:
return false;
}
}
/* Return true if T is a gimple invariant address. */
bool
is_gimple_invariant_address (const_tree t)
{
const_tree op;
if (TREE_CODE (t) != ADDR_EXPR)
return false;
op = strip_invariant_refs (TREE_OPERAND (t, 0));
if (!op)
return false;
if (TREE_CODE (op) == MEM_REF)
{
const_tree op0 = TREE_OPERAND (op, 0);
return (TREE_CODE (op0) == ADDR_EXPR
&& (CONSTANT_CLASS_P (TREE_OPERAND (op0, 0))
|| decl_address_invariant_p (TREE_OPERAND (op0, 0))));
}
return CONSTANT_CLASS_P (op) || decl_address_invariant_p (op);
}
/* Return true if T is a gimple invariant address at IPA level
(so addresses of variables on stack are not allowed). */
bool
is_gimple_ip_invariant_address (const_tree t)
{
const_tree op;
if (TREE_CODE (t) != ADDR_EXPR)
return false;
op = strip_invariant_refs (TREE_OPERAND (t, 0));
if (!op)
return false;
if (TREE_CODE (op) == MEM_REF)
{
const_tree op0 = TREE_OPERAND (op, 0);
return (TREE_CODE (op0) == ADDR_EXPR
&& (CONSTANT_CLASS_P (TREE_OPERAND (op0, 0))
|| decl_address_ip_invariant_p (TREE_OPERAND (op0, 0))));
}
return CONSTANT_CLASS_P (op) || decl_address_ip_invariant_p (op);
}
/* Return true if T is a GIMPLE minimal invariant. It's a restricted
form of function invariant. */
bool
is_gimple_min_invariant (const_tree t)
{
if (TREE_CODE (t) == ADDR_EXPR)
return is_gimple_invariant_address (t);
return is_gimple_constant (t);
}
/* Return true if T is a GIMPLE interprocedural invariant. It's a restricted
form of gimple minimal invariant. */
bool
is_gimple_ip_invariant (const_tree t)
{
if (TREE_CODE (t) == ADDR_EXPR)
return is_gimple_ip_invariant_address (t);
return is_gimple_constant (t);
}
/* Return true if T is a variable. */
bool
is_gimple_variable (tree t)
{
return (TREE_CODE (t) == VAR_DECL
|| TREE_CODE (t) == PARM_DECL
|| TREE_CODE (t) == RESULT_DECL
|| TREE_CODE (t) == SSA_NAME);
}
/* Return true if T is a GIMPLE identifier (something with an address). */
bool
is_gimple_id (tree t)
{
return (is_gimple_variable (t)
|| TREE_CODE (t) == FUNCTION_DECL
|| TREE_CODE (t) == LABEL_DECL
|| TREE_CODE (t) == CONST_DECL
/* Allow string constants, since they are addressable. */
|| TREE_CODE (t) == STRING_CST);
}
/* Return true if OP, an SSA name or a DECL is a virtual operand. */
bool
virtual_operand_p (tree op)
{
if (TREE_CODE (op) == SSA_NAME)
{
op = SSA_NAME_VAR (op);
if (!op)
return false;
}
if (TREE_CODE (op) == VAR_DECL)
return VAR_DECL_IS_VIRTUAL_OPERAND (op);
return false;
}
/* Return true if T is a non-aggregate register variable. */
bool
is_gimple_reg (tree t)
{
if (virtual_operand_p (t))
return false;
if (TREE_CODE (t) == SSA_NAME)
return true;
if (!is_gimple_variable (t))
return false;
if (!is_gimple_reg_type (TREE_TYPE (t)))
return false;
/* A volatile decl is not acceptable because we can't reuse it as
needed. We need to copy it into a temp first. */
if (TREE_THIS_VOLATILE (t))
return false;
/* We define "registers" as things that can be renamed as needed,
which with our infrastructure does not apply to memory. */
if (needs_to_live_in_memory (t))
return false;
/* Hard register variables are an interesting case. For those that
are call-clobbered, we don't know where all the calls are, since
we don't (want to) take into account which operations will turn
into libcalls at the rtl level. For those that are call-saved,
we don't currently model the fact that calls may in fact change
global hard registers, nor do we examine ASM_CLOBBERS at the tree
level, and so miss variable changes that might imply. All around,
it seems safest to not do too much optimization with these at the
tree level at all. We'll have to rely on the rtl optimizers to
clean this up, as there we've got all the appropriate bits exposed. */
if (TREE_CODE (t) == VAR_DECL && DECL_HARD_REGISTER (t))
return false;
/* Complex and vector values must have been put into SSA-like form.
That is, no assignments to the individual components. */
if (TREE_CODE (TREE_TYPE (t)) == COMPLEX_TYPE
|| TREE_CODE (TREE_TYPE (t)) == VECTOR_TYPE)
return DECL_GIMPLE_REG_P (t);
return true;
}
/* Return true if T is a GIMPLE rvalue, i.e. an identifier or a constant. */
bool
is_gimple_val (tree t)
{
/* Make loads from volatiles and memory vars explicit. */
if (is_gimple_variable (t)
&& is_gimple_reg_type (TREE_TYPE (t))
&& !is_gimple_reg (t))
return false;
return (is_gimple_variable (t) || is_gimple_min_invariant (t));
}
/* Similarly, but accept hard registers as inputs to asm statements. */
bool
is_gimple_asm_val (tree t)
{
if (TREE_CODE (t) == VAR_DECL && DECL_HARD_REGISTER (t))
return true;
return is_gimple_val (t);
}
/* Return true if T is a GIMPLE minimal lvalue. */
bool
is_gimple_min_lval (tree t)
{
if (!(t = CONST_CAST_TREE (strip_invariant_refs (t))))
return false;
return (is_gimple_id (t) || TREE_CODE (t) == MEM_REF);
}
/* Return true if T is a valid function operand of a CALL_EXPR. */
bool
is_gimple_call_addr (tree t)
{
return (TREE_CODE (t) == OBJ_TYPE_REF || is_gimple_val (t));
}
/* Return true if T is a valid address operand of a MEM_REF. */
bool
is_gimple_mem_ref_addr (tree t)
{
return (is_gimple_reg (t)
|| TREE_CODE (t) == INTEGER_CST
|| (TREE_CODE (t) == ADDR_EXPR
&& (CONSTANT_CLASS_P (TREE_OPERAND (t, 0))
|| decl_address_invariant_p (TREE_OPERAND (t, 0)))));
}
/* Given a memory reference expression T, return its base address.
The base address of a memory reference expression is the main
object being referenced. For instance, the base address for
@ -3642,37 +3212,6 @@ gimple_ior_addresses_taken (bitmap addresses_taken, gimple stmt)
}
/* Return a printable name for symbol DECL. */
const char *
gimple_decl_printable_name (tree decl, int verbosity)
{
if (!DECL_NAME (decl))
return NULL;
if (DECL_ASSEMBLER_NAME_SET_P (decl))
{
const char *str, *mangled_str;
int dmgl_opts = DMGL_NO_OPTS;
if (verbosity >= 2)
{
dmgl_opts = DMGL_VERBOSE
| DMGL_ANSI
| DMGL_GNU_V3
| DMGL_RET_POSTFIX;
if (TREE_CODE (decl) == FUNCTION_DECL)
dmgl_opts |= DMGL_PARAMS;
}
mangled_str = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
str = cplus_demangle_v3 (mangled_str, dmgl_opts);
return (str) ? str : mangled_str;
}
return IDENTIFIER_POINTER (DECL_NAME (decl));
}
/* Return TRUE iff stmt is a call to a built-in function. */
bool
@ -3763,261 +3302,6 @@ gimple_asm_clobbers_memory_p (const_gimple stmt)
return false;
}
/* Return true if the conversion from INNER_TYPE to OUTER_TYPE is a
useless type conversion, otherwise return false.
This function implicitly defines the middle-end type system. With
the notion of 'a < b' meaning that useless_type_conversion_p (a, b)
holds and 'a > b' meaning that useless_type_conversion_p (b, a) holds,
the following invariants shall be fulfilled:
1) useless_type_conversion_p is transitive.
If a < b and b < c then a < c.
2) useless_type_conversion_p is not symmetric.
From a < b does not follow a > b.
3) Types define the available set of operations applicable to values.
A type conversion is useless if the operations for the target type
is a subset of the operations for the source type. For example
casts to void* are useless, casts from void* are not (void* can't
be dereferenced or offsetted, but copied, hence its set of operations
is a strict subset of that of all other data pointer types). Casts
to const T* are useless (can't be written to), casts from const T*
to T* are not. */
bool
useless_type_conversion_p (tree outer_type, tree inner_type)
{
/* Do the following before stripping toplevel qualifiers. */
if (POINTER_TYPE_P (inner_type)
&& POINTER_TYPE_P (outer_type))
{
/* Do not lose casts between pointers to different address spaces. */
if (TYPE_ADDR_SPACE (TREE_TYPE (outer_type))
!= TYPE_ADDR_SPACE (TREE_TYPE (inner_type)))
return false;
}
/* From now on qualifiers on value types do not matter. */
inner_type = TYPE_MAIN_VARIANT (inner_type);
outer_type = TYPE_MAIN_VARIANT (outer_type);
if (inner_type == outer_type)
return true;
/* If we know the canonical types, compare them. */
if (TYPE_CANONICAL (inner_type)
&& TYPE_CANONICAL (inner_type) == TYPE_CANONICAL (outer_type))
return true;
/* Changes in machine mode are never useless conversions unless we
deal with aggregate types in which case we defer to later checks. */
if (TYPE_MODE (inner_type) != TYPE_MODE (outer_type)
&& !AGGREGATE_TYPE_P (inner_type))
return false;
/* If both the inner and outer types are integral types, then the
conversion is not necessary if they have the same mode and
signedness and precision, and both or neither are boolean. */
if (INTEGRAL_TYPE_P (inner_type)
&& INTEGRAL_TYPE_P (outer_type))
{
/* Preserve changes in signedness or precision. */
if (TYPE_UNSIGNED (inner_type) != TYPE_UNSIGNED (outer_type)
|| TYPE_PRECISION (inner_type) != TYPE_PRECISION (outer_type))
return false;
/* Preserve conversions to/from BOOLEAN_TYPE if types are not
of precision one. */
if (((TREE_CODE (inner_type) == BOOLEAN_TYPE)
!= (TREE_CODE (outer_type) == BOOLEAN_TYPE))
&& TYPE_PRECISION (outer_type) != 1)
return false;
/* We don't need to preserve changes in the types minimum or
maximum value in general as these do not generate code
unless the types precisions are different. */
return true;
}
/* Scalar floating point types with the same mode are compatible. */
else if (SCALAR_FLOAT_TYPE_P (inner_type)
&& SCALAR_FLOAT_TYPE_P (outer_type))
return true;
/* Fixed point types with the same mode are compatible. */
else if (FIXED_POINT_TYPE_P (inner_type)
&& FIXED_POINT_TYPE_P (outer_type))
return true;
/* We need to take special care recursing to pointed-to types. */
else if (POINTER_TYPE_P (inner_type)
&& POINTER_TYPE_P (outer_type))
{
/* Do not lose casts to function pointer types. */
if ((TREE_CODE (TREE_TYPE (outer_type)) == FUNCTION_TYPE
|| TREE_CODE (TREE_TYPE (outer_type)) == METHOD_TYPE)
&& !(TREE_CODE (TREE_TYPE (inner_type)) == FUNCTION_TYPE
|| TREE_CODE (TREE_TYPE (inner_type)) == METHOD_TYPE))
return false;
/* We do not care for const qualification of the pointed-to types
as const qualification has no semantic value to the middle-end. */
/* Otherwise pointers/references are equivalent. */
return true;
}
/* Recurse for complex types. */
else if (TREE_CODE (inner_type) == COMPLEX_TYPE
&& TREE_CODE (outer_type) == COMPLEX_TYPE)
return useless_type_conversion_p (TREE_TYPE (outer_type),
TREE_TYPE (inner_type));
/* Recurse for vector types with the same number of subparts. */
else if (TREE_CODE (inner_type) == VECTOR_TYPE
&& TREE_CODE (outer_type) == VECTOR_TYPE
&& TYPE_PRECISION (inner_type) == TYPE_PRECISION (outer_type))
return useless_type_conversion_p (TREE_TYPE (outer_type),
TREE_TYPE (inner_type));
else if (TREE_CODE (inner_type) == ARRAY_TYPE
&& TREE_CODE (outer_type) == ARRAY_TYPE)
{
/* Preserve string attributes. */
if (TYPE_STRING_FLAG (inner_type) != TYPE_STRING_FLAG (outer_type))
return false;
/* Conversions from array types with unknown extent to
array types with known extent are not useless. */
if (!TYPE_DOMAIN (inner_type)
&& TYPE_DOMAIN (outer_type))
return false;
/* Nor are conversions from array types with non-constant size to
array types with constant size or to different size. */
if (TYPE_SIZE (outer_type)
&& TREE_CODE (TYPE_SIZE (outer_type)) == INTEGER_CST
&& (!TYPE_SIZE (inner_type)
|| TREE_CODE (TYPE_SIZE (inner_type)) != INTEGER_CST
|| !tree_int_cst_equal (TYPE_SIZE (outer_type),
TYPE_SIZE (inner_type))))
return false;
/* Check conversions between arrays with partially known extents.
If the array min/max values are constant they have to match.
Otherwise allow conversions to unknown and variable extents.
In particular this declares conversions that may change the
mode to BLKmode as useless. */
if (TYPE_DOMAIN (inner_type)
&& TYPE_DOMAIN (outer_type)
&& TYPE_DOMAIN (inner_type) != TYPE_DOMAIN (outer_type))
{
tree inner_min = TYPE_MIN_VALUE (TYPE_DOMAIN (inner_type));
tree outer_min = TYPE_MIN_VALUE (TYPE_DOMAIN (outer_type));
tree inner_max = TYPE_MAX_VALUE (TYPE_DOMAIN (inner_type));
tree outer_max = TYPE_MAX_VALUE (TYPE_DOMAIN (outer_type));
/* After gimplification a variable min/max value carries no
additional information compared to a NULL value. All that
matters has been lowered to be part of the IL. */
if (inner_min && TREE_CODE (inner_min) != INTEGER_CST)
inner_min = NULL_TREE;
if (outer_min && TREE_CODE (outer_min) != INTEGER_CST)
outer_min = NULL_TREE;
if (inner_max && TREE_CODE (inner_max) != INTEGER_CST)
inner_max = NULL_TREE;
if (outer_max && TREE_CODE (outer_max) != INTEGER_CST)
outer_max = NULL_TREE;
/* Conversions NULL / variable <- cst are useless, but not
the other way around. */
if (outer_min
&& (!inner_min
|| !tree_int_cst_equal (inner_min, outer_min)))
return false;
if (outer_max
&& (!inner_max
|| !tree_int_cst_equal (inner_max, outer_max)))
return false;
}
/* Recurse on the element check. */
return useless_type_conversion_p (TREE_TYPE (outer_type),
TREE_TYPE (inner_type));
}
else if ((TREE_CODE (inner_type) == FUNCTION_TYPE
|| TREE_CODE (inner_type) == METHOD_TYPE)
&& TREE_CODE (inner_type) == TREE_CODE (outer_type))
{
tree outer_parm, inner_parm;
/* If the return types are not compatible bail out. */
if (!useless_type_conversion_p (TREE_TYPE (outer_type),
TREE_TYPE (inner_type)))
return false;
/* Method types should belong to a compatible base class. */
if (TREE_CODE (inner_type) == METHOD_TYPE
&& !useless_type_conversion_p (TYPE_METHOD_BASETYPE (outer_type),
TYPE_METHOD_BASETYPE (inner_type)))
return false;
/* A conversion to an unprototyped argument list is ok. */
if (!prototype_p (outer_type))
return true;
/* If the unqualified argument types are compatible the conversion
is useless. */
if (TYPE_ARG_TYPES (outer_type) == TYPE_ARG_TYPES (inner_type))
return true;
for (outer_parm = TYPE_ARG_TYPES (outer_type),
inner_parm = TYPE_ARG_TYPES (inner_type);
outer_parm && inner_parm;
outer_parm = TREE_CHAIN (outer_parm),
inner_parm = TREE_CHAIN (inner_parm))
if (!useless_type_conversion_p
(TYPE_MAIN_VARIANT (TREE_VALUE (outer_parm)),
TYPE_MAIN_VARIANT (TREE_VALUE (inner_parm))))
return false;
/* If there is a mismatch in the number of arguments the functions
are not compatible. */
if (outer_parm || inner_parm)
return false;
/* Defer to the target if necessary. */
if (TYPE_ATTRIBUTES (inner_type) || TYPE_ATTRIBUTES (outer_type))
return comp_type_attributes (outer_type, inner_type) != 0;
return true;
}
/* For aggregates we rely on TYPE_CANONICAL exclusively and require
explicit conversions for types involving to be structurally
compared types. */
else if (AGGREGATE_TYPE_P (inner_type)
&& TREE_CODE (inner_type) == TREE_CODE (outer_type))
return false;
return false;
}
/* Return true if a conversion from either type of TYPE1 and TYPE2
to the other is not required. Otherwise return false. */
bool
types_compatible_p (tree type1, tree type2)
{
return (type1 == type2
|| (useless_type_conversion_p (type1, type2)
&& useless_type_conversion_p (type2, type1)));
}
/* Dump bitmap SET (assumed to contain VAR_DECLs) to FILE. */
void
@ -4042,45 +3326,6 @@ dump_decl_set (FILE *file, bitmap set)
fprintf (file, "NIL");
}
/* Given SSA_NAMEs NAME1 and NAME2, return true if they are candidates for
coalescing together, false otherwise.
This must stay consistent with var_map_base_init in tree-ssa-live.c. */
bool
gimple_can_coalesce_p (tree name1, tree name2)
{
/* First check the SSA_NAME's associated DECL. We only want to
coalesce if they have the same DECL or both have no associated DECL. */
tree var1 = SSA_NAME_VAR (name1);
tree var2 = SSA_NAME_VAR (name2);
var1 = (var1 && (!VAR_P (var1) || !DECL_IGNORED_P (var1))) ? var1 : NULL_TREE;
var2 = (var2 && (!VAR_P (var2) || !DECL_IGNORED_P (var2))) ? var2 : NULL_TREE;
if (var1 != var2)
return false;
/* Now check the types. If the types are the same, then we should
try to coalesce V1 and V2. */
tree t1 = TREE_TYPE (name1);
tree t2 = TREE_TYPE (name2);
if (t1 == t2)
return true;
/* If the types are not the same, check for a canonical type match. This
(for example) allows coalescing when the types are fundamentally the
same, but just have different names.
Note pointer types with different address spaces may have the same
canonical type. Those are rejected for coalescing by the
types_compatible_p check. */
if (TYPE_CANONICAL (t1)
&& TYPE_CANONICAL (t1) == TYPE_CANONICAL (t2)
&& types_compatible_p (t1, t2))
return true;
return false;
}
/* Return true when CALL is a call stmt that definitely doesn't
free any memory or makes it unavailable otherwise. */
bool
@ -4102,24 +3347,3 @@ nonfreeing_call_p (gimple call)
return false;
}
/* Create a new VAR_DECL and copy information from VAR to it. */
tree
copy_var_decl (tree var, tree name, tree type)
{
tree copy = build_decl (DECL_SOURCE_LOCATION (var), VAR_DECL, name, type);
TREE_ADDRESSABLE (copy) = TREE_ADDRESSABLE (var);
TREE_THIS_VOLATILE (copy) = TREE_THIS_VOLATILE (var);
DECL_GIMPLE_REG_P (copy) = DECL_GIMPLE_REG_P (var);
DECL_ARTIFICIAL (copy) = DECL_ARTIFICIAL (var);
DECL_IGNORED_P (copy) = DECL_IGNORED_P (var);
DECL_CONTEXT (copy) = DECL_CONTEXT (var);
TREE_NO_WARNING (copy) = TREE_NO_WARNING (var);
TREE_USED (copy) = 1;
DECL_SEEN_IN_BIND_EXPR_P (copy) = 1;
DECL_ATTRIBUTES (copy) = DECL_ATTRIBUTES (var);
return copy;
}

92
gcc/gimple.h
View File

@ -31,6 +31,7 @@ along with GCC; see the file COPYING3. If not see
#include "internal-fn.h"
#include "gimple-fold.h"
#include "tree-eh.h"
#include "gimple-expr.h"
typedef gimple gimple_seq_node;
@ -745,8 +746,6 @@ gimple gimple_build_return (tree);
gimple gimple_build_assign_stat (tree, tree MEM_STAT_DECL);
#define gimple_build_assign(l,r) gimple_build_assign_stat (l, r MEM_STAT_INFO)
void extract_ops_from_tree_1 (tree, enum tree_code *, tree *, tree *, tree *);
gimple
gimple_build_assign_with_ops (enum tree_code, tree,
tree, tree CXX_MEM_STAT_INFO);
@ -809,9 +808,6 @@ gimple gimple_build_predict (enum br_predictor, enum prediction);
enum gimple_statement_structure_enum gss_for_assign (enum tree_code);
void sort_case_labels (vec<tree> );
void preprocess_case_label_vec_for_gimple (vec<tree> , tree, tree *);
void gimple_set_body (tree, gimple_seq);
gimple_seq gimple_body (tree);
bool gimple_has_body_p (tree);
gimple_seq gimple_seq_alloc (void);
void gimple_seq_free (gimple_seq);
void gimple_seq_add_seq (gimple_seq *, gimple_seq);
@ -832,7 +828,6 @@ tree gimple_get_lhs (const_gimple);
void gimple_set_lhs (gimple, tree);
void gimple_replace_lhs (gimple, tree);
gimple gimple_copy (gimple);
void gimple_cond_get_ops_from_tree (tree, enum tree_code *, tree *, tree *);
gimple gimple_build_cond_from_tree (tree, tree, tree);
void gimple_cond_set_condition_from_tree (gimple, tree);
bool gimple_has_side_effects (const_gimple);
@ -844,48 +839,6 @@ bool empty_body_p (gimple_seq);
unsigned get_gimple_rhs_num_ops (enum tree_code);
#define gimple_alloc(c, n) gimple_alloc_stat (c, n MEM_STAT_INFO)
gimple gimple_alloc_stat (enum gimple_code, unsigned MEM_STAT_DECL);
const char *gimple_decl_printable_name (tree, int);
/* Returns true iff T is a virtual ssa name decl. */
extern bool virtual_operand_p (tree);
/* Returns true iff T is a scalar register variable. */
extern bool is_gimple_reg (tree);
/* Returns true iff T is any sort of variable. */
extern bool is_gimple_variable (tree);
/* Returns true iff T is any sort of symbol. */
extern bool is_gimple_id (tree);
/* Returns true iff T is a variable or an INDIRECT_REF (of a variable). */
extern bool is_gimple_min_lval (tree);
/* Returns true iff T is something whose address can be taken. */
extern bool is_gimple_addressable (tree);
/* Returns true iff T is any valid GIMPLE lvalue. */
extern bool is_gimple_lvalue (tree);
/* Returns true iff T is a GIMPLE address. */
bool is_gimple_address (const_tree);
/* Returns true iff T is a GIMPLE invariant address. */
bool is_gimple_invariant_address (const_tree);
/* Returns true iff T is a GIMPLE invariant address at interprocedural
level. */
bool is_gimple_ip_invariant_address (const_tree);
/* Returns true iff T is a valid GIMPLE constant. */
bool is_gimple_constant (const_tree);
/* Returns true iff T is a GIMPLE restricted function invariant. */
extern bool is_gimple_min_invariant (const_tree);
/* Returns true iff T is a GIMPLE restricted interprecodural invariant. */
extern bool is_gimple_ip_invariant (const_tree);
/* Returns true iff T is a GIMPLE rvalue. */
extern bool is_gimple_val (tree);
/* Returns true iff T is a GIMPLE asm statement input. */
extern bool is_gimple_asm_val (tree);
/* Returns true iff T is a valid address operand of a MEM_REF. */
bool is_gimple_mem_ref_addr (tree);
/* Returns true iff T is a valid if-statement condition. */
extern bool is_gimple_condexpr (tree);
/* Returns true iff T is a valid call address expression. */
extern bool is_gimple_call_addr (tree);
/* Return TRUE iff stmt is a call to a built-in function. */
extern bool is_gimple_builtin_call (gimple stmt);
@ -906,8 +859,6 @@ extern bool gimple_ior_addresses_taken (bitmap, gimple);
extern bool gimple_call_builtin_p (gimple, enum built_in_class);
extern bool gimple_call_builtin_p (gimple, enum built_in_function);
extern bool gimple_asm_clobbers_memory_p (const_gimple);
extern bool useless_type_conversion_p (tree, tree);
extern bool types_compatible_p (tree, tree);
/* In gimplify.c */
extern tree create_tmp_var_raw (tree, const char *);
@ -1086,9 +1037,7 @@ extern tree gimple_boolify (tree);
extern gimple_predicate rhs_predicate_for (tree);
extern tree canonicalize_cond_expr_cond (tree);
extern void dump_decl_set (FILE *, bitmap);
extern bool gimple_can_coalesce_p (tree, tree);
extern bool nonfreeing_call_p (gimple);
extern tree copy_var_decl (tree, tree, tree);
/* In trans-mem.c. */
extern void diagnose_tm_safe_errors (tree);
@ -2042,18 +1991,6 @@ gimple_assign_set_rhs_with_ops (gimple_stmt_iterator *gsi, enum tree_code code,
gimple_assign_set_rhs_with_ops_1 (gsi, code, op1, op2, NULL);
}
/* A wrapper around extract_ops_from_tree_1, for callers which expect
to see only a maximum of two operands. */
static inline void
extract_ops_from_tree (tree expr, enum tree_code *code, tree *op0,
tree *op1)
{
tree op2;
extract_ops_from_tree_1 (expr, code, op0, op1, &op2);
gcc_assert (op2 == NULL_TREE);
}
/* Returns true if GS is a nontemporal move. */
static inline bool
@ -2316,25 +2253,6 @@ gimple_call_set_internal_fn (gimple gs, enum internal_fn fn)
}
/* Given a valid GIMPLE_CALL function address return the FUNCTION_DECL
associated with the callee if known. Otherwise return NULL_TREE. */
static inline tree
gimple_call_addr_fndecl (const_tree fn)
{
if (fn && TREE_CODE (fn) == ADDR_EXPR)
{
tree fndecl = TREE_OPERAND (fn, 0);
if (TREE_CODE (fndecl) == MEM_REF
&& TREE_CODE (TREE_OPERAND (fndecl, 0)) == ADDR_EXPR
&& integer_zerop (TREE_OPERAND (fndecl, 1)))
fndecl = TREE_OPERAND (TREE_OPERAND (fndecl, 0), 0);
if (TREE_CODE (fndecl) == FUNCTION_DECL)
return fndecl;
}
return NULL_TREE;
}
/* If a given GIMPLE_CALL's callee is a FUNCTION_DECL, return it.
Otherwise return NULL. This function is analogous to
get_callee_fndecl in tree land. */
@ -5385,14 +5303,6 @@ gimple_expr_type (const_gimple stmt)
return void_type_node;
}
/* Return true if TYPE is a suitable type for a scalar register variable. */
static inline bool
is_gimple_reg_type (tree type)
{
return !AGGREGATE_TYPE_P (type);
}
/* Return a new iterator pointing to GIMPLE_SEQ's first statement. */
static inline gimple_stmt_iterator