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/*
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Crown Copyright (c) 1997
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This TenDRA(r) Computer Program is subject to Copyright
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owned by the United Kingdom Secretary of State for Defence
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acting through the Defence Evaluation and Research Agency
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(DERA). It is made available to Recipients with a
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royalty-free licence for its use, reproduction, transfer
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to other parties and amendment for any purpose not excluding
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product development provided that any such use et cetera
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shall be deemed to be acceptance of the following conditions:-
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(1) Its Recipients shall ensure that this Notice is
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reproduced upon any copies or amended versions of it;
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(2) Any amended version of it shall be clearly marked to
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show both the nature of and the organisation responsible
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for the relevant amendment or amendments;
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(3) Its onward transfer from a recipient to another
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party shall be deemed to be that party's acceptance of
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these conditions;
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(4) DERA gives no warranty or assurance as to its
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quality or suitability for any purpose and DERA accepts
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no liability whatsoever in relation to any use to which
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it may be put.
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*/
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#include "config.h"
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#include "c_types.h"
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#include "ctype_ops.h"
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#include "err_ops.h"
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#include "exp_ops.h"
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#include "ftype_ops.h"
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#include "graph_ops.h"
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#include "id_ops.h"
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#include "itype_ops.h"
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#include "nat_ops.h"
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#include "tok_ops.h"
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#include "type_ops.h"
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#include "error.h"
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#include "catalog.h"
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#include "option.h"
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#include "access.h"
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#include "basetype.h"
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#include "cast.h"
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#include "check.h"
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#include "chktype.h"
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#include "constant.h"
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#include "construct.h"
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#include "convert.h"
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#include "derive.h"
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#include "exception.h"
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#include "expression.h"
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#include "function.h"
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#include "identifier.h"
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#include "initialise.h"
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#include "inttype.h"
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#include "literal.h"
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#include "overload.h"
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#include "predict.h"
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#include "statement.h"
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#include "syntax.h"
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#include "template.h"
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#include "tok.h"
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#include "tokdef.h"
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#include "token.h"
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#include "typeid.h"
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/*
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CREATE AN EXACT CAST EXPRESSION
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This routine introduces a dummy cast expression which converts the
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expression a to its own type t. This is needed in a couple of places
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where it is necessary to recognise cast expressions.
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*/
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static EXP cast_exact
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PROTO_N ( ( t, a ) )
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PROTO_T ( TYPE t X EXP a )
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{
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EXP e ;
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if ( IS_exp_cast ( a ) ) {
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/* Exact casts are idempotent */
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unsigned conv = DEREF_unsigned ( exp_cast_conv ( a ) ) ;
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if ( conv == CONV_EXACT ) {
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a = DEREF_exp ( exp_cast_arg ( a ) ) ;
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}
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}
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MAKE_exp_cast ( t, CONV_EXACT, a, e ) ;
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return ( e ) ;
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}
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/*
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FIND THE RANK OF AN INTEGER-INTEGER CONVERSION
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This routine finds the rank of a conversion to the integral type t
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from the integral type s. For basic types this is given by the
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table builtin_casts.
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*/
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static int rank_int_int
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PROTO_N ( ( t, s ) )
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PROTO_T ( TYPE t X TYPE s )
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{
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int ct = 100, cr = 100 ;
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INT_TYPE is = DEREF_itype ( type_integer_sem ( s ) ) ;
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INT_TYPE it = DEREF_itype ( type_integer_sem ( t ) ) ;
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INT_TYPE ir = DEREF_itype ( type_integer_rep ( t ) ) ;
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/* Find the semantic conversion */
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if ( !EQ_itype ( it, ir ) ) {
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if ( eq_itype ( it, is ) ) return ( 0 ) ;
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if ( IS_itype_basic ( ir ) && IS_itype_basic ( is ) ) {
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BUILTIN_TYPE bt = DEREF_ntype ( itype_basic_no ( it ) ) ;
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BUILTIN_TYPE bs = DEREF_ntype ( itype_basic_no ( is ) ) ;
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ct = builtin_cast ( bs, bt ) ;
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}
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}
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/* Find the representational conversion */
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while ( IS_itype_promote ( ir ) ) {
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/* Allow for integer promotion conversions */
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ir = DEREF_itype ( itype_promote_arg ( ir ) ) ;
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}
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if ( eq_itype ( ir, is ) ) return ( 0 ) ;
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if ( IS_itype_basic ( ir ) && IS_itype_basic ( is ) ) {
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BUILTIN_TYPE br = DEREF_ntype ( itype_basic_no ( ir ) ) ;
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BUILTIN_TYPE bs = DEREF_ntype ( itype_basic_no ( is ) ) ;
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cr = builtin_cast ( bs, br ) ;
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} else {
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TYPE ps = promote_type ( s ) ;
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if ( eq_type ( ps, t ) ) return ( 0 ) ;
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}
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/* Return the better conversion */
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return ( cr < ct ? cr : ct ) ;
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}
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/*
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FIND THE RANK OF A FLOATING-FLOATING CONVERSION
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This routine finds the rank of a conversion to the floating-point
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type t from the floating-point type s.
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*/
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static int rank_float_float
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PROTO_N ( ( t, s ) )
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PROTO_T ( TYPE t X TYPE s )
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{
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int ct = 0 ;
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FLOAT_TYPE fs = DEREF_ftype ( type_floating_rep ( s ) ) ;
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FLOAT_TYPE ft = DEREF_ftype ( type_floating_rep ( t ) ) ;
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while ( IS_ftype_arg_promote ( ft ) ) {
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/* Allow for floating promotion conversions */
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ft = DEREF_ftype ( ftype_arg_promote_arg ( ft ) ) ;
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}
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if ( !eq_ftype ( ft, fs ) ) {
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if ( IS_ftype_basic ( ft ) && IS_ftype_basic ( fs ) ) {
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BUILTIN_TYPE nt = DEREF_ntype ( ftype_basic_no ( ft ) ) ;
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BUILTIN_TYPE ns = DEREF_ntype ( ftype_basic_no ( fs ) ) ;
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ct = builtin_cast ( ns, nt ) ;
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} else {
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TYPE ps = promote_type ( s ) ;
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if ( eq_type ( ps, t ) ) return ( 0 ) ;
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}
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}
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return ( ct ) ;
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}
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/*
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PERFORM AN INTEGER-INTEGER CONVERSION
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This, and the following routines, are used to perform the basic type
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conversions allowed within the language. Each takes a destination
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type t and an argument expression a. In this case both t and the type
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of a are integral (including enumeration and bitfield) types. The case
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where t is bool is dealt with separately by convert_boolean, however a
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may have type bool. rank gives the rank of the conversion, or -1 if
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the rank needs to be calculated using rank_int_int.
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*/
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EXP cast_int_int
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PROTO_N ( ( t, a, err, cast, rank ) )
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PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast X int rank )
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{
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EXP e ;
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int opt ;
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TYPE s = DEREF_type ( exp_type ( a ) ) ;
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unsigned nt = TAG_type ( t ) ;
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unsigned ns = TAG_type ( s ) ;
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/* Don't force unnecessary token definitions */
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if ( force_tokdef ) {
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TYPE t0 = t ;
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TYPE s0 = s ;
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t = expand_type ( t0, 1 ) ;
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if ( !EQ_type ( t, t0 ) ) {
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nt = TAG_type ( t ) ;
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if ( nt == type_floating_tag || nt == type_ptr_tag ) {
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t = t0 ;
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nt = TAG_type ( t ) ;
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}
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}
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s = expand_type ( s0, 1 ) ;
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if ( !EQ_type ( s, s0 ) ) {
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ns = TAG_type ( s ) ;
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if ( ns == type_floating_tag || ns == type_ptr_tag ) {
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s = s0 ;
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ns = TAG_type ( s ) ;
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}
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}
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}
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/* Deal with bitfields */
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if ( ns == type_bitfield_tag ) {
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TYPE r = find_bitfield_type ( s ) ;
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MAKE_exp_cast ( r, CONV_BITFIELD, a, a ) ;
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/* NOT YET IMPLEMENTED: find rank */
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rank = 0 ;
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e = cast_int_int ( t, a, err, cast, rank ) ;
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if ( EQ_exp ( e, a ) ) {
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MAKE_exp_cast ( t, CONV_INT_INT, e, e ) ;
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}
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return ( e ) ;
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}
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if ( nt == type_bitfield_tag ) {
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TYPE r = find_bitfield_type ( t ) ;
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/* NOT YET IMPLEMENTED: find rank */
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rank = 0 ;
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e = cast_int_int ( r, a, err, cast, rank ) ;
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if ( EQ_exp ( e, a ) ) {
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MAKE_exp_cast ( r, CONV_INT_INT, e, e ) ;
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}
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MAKE_exp_cast ( t, ( CONV_BITFIELD | CONV_REVERSE ), e, e ) ;
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return ( e ) ;
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}
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/* Deal with identity casts */
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if ( nt == ns ) {
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if ( EQ_type ( t, s ) ) {
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if ( IS_exp_int_lit ( a ) && cast != CAST_IMPLICIT ) {
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NAT n = DEREF_nat ( exp_int_lit_nat ( a ) ) ;
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MAKE_exp_int_lit ( t, n, exp_cast_tag, a ) ;
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}
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return ( a ) ;
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}
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if ( eq_type ( t, s ) ) {
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if ( cast == CAST_IMPLICIT ) {
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/* Preserve semantics for implicit casts */
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return ( a ) ;
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}
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if ( cast != CAST_REINTERP ) {
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/* Override semantics for other casts */
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if ( IS_exp_int_lit ( a ) ) {
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NAT n = DEREF_nat ( exp_int_lit_nat ( a ) ) ;
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MAKE_exp_int_lit ( t, n, exp_cast_tag, e ) ;
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} else {
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MAKE_exp_cast ( t, CONV_INT_INT, a, e ) ;
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}
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return ( e ) ;
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}
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}
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}
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/* Find error severity level */
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if ( cast == CAST_IMPLICIT ) {
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opt = OPT_conv_int_int_impl ;
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} else if ( cast & CAST_STATIC ) {
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opt = OPT_conv_int_int_expl ;
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} else {
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opt = OPT_error ;
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}
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/* Can't cast implicitly to enumeration type */
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if ( nt == type_enumerate_tag ) {
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ERROR err2 ;
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#if LANGUAGE_C
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if ( IS_exp_int_lit ( a ) ) {
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/* Allow for C enumerators */
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unsigned tag = DEREF_unsigned ( exp_int_lit_etag ( a ) ) ;
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if ( tag == exp_identifier_tag ) {
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e = make_cast_nat ( t, a, err, cast ) ;
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return ( e ) ;
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}
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}
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#endif
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if ( cast == CAST_IMPLICIT ) {
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if ( option ( OPT_conv_int_enum ) > option ( opt ) ) {
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opt = OPT_conv_int_enum ;
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}
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}
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if ( ns == type_enumerate_tag ) {
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err2 = ERR_expr_cast_stat_enum_enum ( s, t ) ;
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} else {
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err2 = ERR_expr_cast_stat_int_enum ( s, t ) ;
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}
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err2 = set_severity ( err2, opt, 0 ) ;
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if ( !IS_NULL_err ( err2 ) ) {
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e = cast_token ( t, a, err, err2, cast ) ;
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if ( !IS_NULL_exp ( e ) ) return ( e ) ;
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}
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} else if ( opt == OPT_error ) {
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ERROR err2 = ERR_conv_integral_cast ( s, t ) ;
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err2 = set_severity ( err2, opt, 0 ) ;
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if ( !IS_NULL_err ( err2 ) ) {
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e = cast_token ( t, a, err, err2, cast ) ;
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if ( !IS_NULL_exp ( e ) ) return ( e ) ;
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}
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opt = OPT_none ;
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}
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/* Deal with integral constants */
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if ( IS_exp_int_lit ( a ) ) {
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e = make_cast_nat ( t, a, err, cast ) ;
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return ( e ) ;
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}
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/* Check integer to integer conversions */
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if ( rank != 0 && option ( opt ) ) {
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if ( nt == type_integer_tag && ns == type_integer_tag ) {
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if ( rank < 0 ) rank = rank_int_int ( t, s ) ;
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329 |
if ( rank >= max_builtin_cast ) {
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ERROR err2 = ERR_conv_integral_cast ( s, t ) ;
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err2 = set_severity ( err2, opt, 0 ) ;
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332 |
if ( !IS_NULL_err ( err2 ) ) {
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e = cast_token ( t, a, err, err2, cast ) ;
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if ( !IS_NULL_exp ( e ) ) return ( e ) ;
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}
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}
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}
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}
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340 |
/* Construct the result */
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341 |
MAKE_exp_cast ( t, CONV_INT_INT, a, e ) ;
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return ( e ) ;
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}
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344 |
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/*
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347 |
PERFORM A INTEGER-FLOAT CONVERSION
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348 |
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|
|
349 |
This routine converts the integral expression a to the floating point
|
|
|
350 |
type t.
|
|
|
351 |
*/
|
|
|
352 |
|
|
|
353 |
EXP cast_int_float
|
|
|
354 |
PROTO_N ( ( t, a, err, cast ) )
|
|
|
355 |
PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast )
|
|
|
356 |
{
|
|
|
357 |
EXP e ;
|
|
|
358 |
int opt ;
|
|
|
359 |
TYPE s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
360 |
|
|
|
361 |
/* Find error severity level */
|
|
|
362 |
if ( cast == CAST_IMPLICIT ) {
|
|
|
363 |
opt = OPT_conv_int_int_impl ;
|
|
|
364 |
} else if ( cast & CAST_STATIC ) {
|
|
|
365 |
opt = OPT_conv_int_int_expl ;
|
|
|
366 |
} else {
|
|
|
367 |
opt = OPT_error ;
|
|
|
368 |
}
|
|
|
369 |
if ( option ( opt ) ) {
|
|
|
370 |
ERROR err2 = ERR_conv_fpint_float ( s, t ) ;
|
|
|
371 |
err2 = set_severity ( err2, opt, 0 ) ;
|
|
|
372 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
373 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
374 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
375 |
}
|
|
|
376 |
}
|
|
|
377 |
|
|
|
378 |
/* Construct the result */
|
|
|
379 |
MAKE_exp_cast ( t, CONV_INT_FLT, a, e ) ;
|
|
|
380 |
return ( e ) ;
|
|
|
381 |
}
|
|
|
382 |
|
|
|
383 |
|
|
|
384 |
/*
|
|
|
385 |
PERFORM A FLOAT-INTEGER CONVERSION
|
|
|
386 |
|
|
|
387 |
This routine converts the floating point expression a to the integral
|
|
|
388 |
type t (which will not be bool). Note that a floating point literal
|
|
|
389 |
cast to an integral type is an integral constant expression.
|
|
|
390 |
*/
|
|
|
391 |
|
|
|
392 |
static EXP cast_float_int
|
|
|
393 |
PROTO_N ( ( t, a, err, cast ) )
|
|
|
394 |
PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast )
|
|
|
395 |
{
|
|
|
396 |
EXP e ;
|
|
|
397 |
int opt ;
|
|
|
398 |
TYPE s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
399 |
|
|
|
400 |
/* Find error severity level */
|
|
|
401 |
if ( cast == CAST_IMPLICIT ) {
|
|
|
402 |
opt = OPT_conv_int_int_impl ;
|
|
|
403 |
if ( IS_type_enumerate ( t ) ) {
|
|
|
404 |
/* Can't have enumeration type */
|
|
|
405 |
if ( option ( OPT_conv_int_enum ) > option ( opt ) ) {
|
|
|
406 |
opt = OPT_conv_int_enum ;
|
|
|
407 |
}
|
|
|
408 |
}
|
|
|
409 |
} else if ( cast & CAST_STATIC ) {
|
|
|
410 |
opt = OPT_conv_int_int_expl ;
|
|
|
411 |
} else {
|
|
|
412 |
opt = OPT_error ;
|
|
|
413 |
}
|
|
|
414 |
if ( option ( opt ) ) {
|
|
|
415 |
ERROR err2 = ERR_conv_fpint_trunc ( s, t ) ;
|
|
|
416 |
err2 = set_severity ( err2, opt, 0 ) ;
|
|
|
417 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
418 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
419 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
420 |
}
|
|
|
421 |
}
|
|
|
422 |
|
|
|
423 |
/* Construct the result */
|
|
|
424 |
MAKE_exp_cast ( t, CONV_FLT_INT, a, e ) ;
|
|
|
425 |
|
|
|
426 |
/* Deal with floating point literals */
|
|
|
427 |
if ( IS_exp_float_lit ( a ) ) {
|
|
|
428 |
FLOAT f = DEREF_flt ( exp_float_lit_flt ( a ) ) ;
|
|
|
429 |
NAT n = round_float_lit ( f, crt_round_mode ) ;
|
|
|
430 |
if ( !IS_NULL_nat ( n ) ) {
|
|
|
431 |
EXP c = make_int_exp ( t, exp_cast_tag, n ) ;
|
|
|
432 |
if ( !IS_NULL_exp ( c ) ) return ( c ) ;
|
|
|
433 |
}
|
|
|
434 |
MAKE_nat_calc ( e, n ) ;
|
|
|
435 |
MAKE_exp_int_lit ( t, n, exp_cast_tag, e ) ;
|
|
|
436 |
}
|
|
|
437 |
return ( e ) ;
|
|
|
438 |
}
|
|
|
439 |
|
|
|
440 |
|
|
|
441 |
/*
|
|
|
442 |
PERFORM A FLOAT-FLOAT CONVERSION
|
|
|
443 |
|
|
|
444 |
This routine converts the floating point expression a to the floating
|
|
|
445 |
point type t.
|
|
|
446 |
*/
|
|
|
447 |
|
|
|
448 |
EXP cast_float_float
|
|
|
449 |
PROTO_N ( ( t, a, err, cast ) )
|
|
|
450 |
PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast )
|
|
|
451 |
{
|
|
|
452 |
EXP e ;
|
|
|
453 |
int opt ;
|
|
|
454 |
TYPE s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
455 |
|
|
|
456 |
/* Don't force unnecessary token definitions */
|
|
|
457 |
if ( force_tokdef ) {
|
|
|
458 |
TYPE t0 = t ;
|
|
|
459 |
TYPE s0 = s ;
|
|
|
460 |
t = expand_type ( t0, 1 ) ;
|
|
|
461 |
s = expand_type ( s0, 1 ) ;
|
|
|
462 |
if ( !IS_type_floating ( t ) ) t = t0 ;
|
|
|
463 |
if ( !IS_type_floating ( s ) ) s = s0 ;
|
|
|
464 |
}
|
|
|
465 |
|
|
|
466 |
/* Deal with identity casts */
|
|
|
467 |
if ( eq_type ( t, s ) ) {
|
|
|
468 |
if ( cast != CAST_REINTERP ) return ( a ) ;
|
|
|
469 |
}
|
|
|
470 |
|
|
|
471 |
/* Find error severity level */
|
|
|
472 |
if ( cast == CAST_IMPLICIT ) {
|
|
|
473 |
opt = OPT_conv_int_int_impl ;
|
|
|
474 |
} else if ( cast & CAST_STATIC ) {
|
|
|
475 |
opt = OPT_conv_int_int_expl ;
|
|
|
476 |
} else {
|
|
|
477 |
opt = OPT_error ;
|
|
|
478 |
}
|
|
|
479 |
if ( option ( opt ) ) {
|
|
|
480 |
int c = rank_float_float ( t, s ) ;
|
|
|
481 |
if ( c >= max_builtin_cast || opt == OPT_error ) {
|
|
|
482 |
ERROR err2 = ERR_conv_double_cast ( s, t ) ;
|
|
|
483 |
err2 = set_severity ( err2, opt, 0 ) ;
|
|
|
484 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
485 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
486 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
487 |
}
|
|
|
488 |
}
|
|
|
489 |
}
|
|
|
490 |
|
|
|
491 |
/* Construct the result */
|
|
|
492 |
MAKE_exp_cast ( t, CONV_FLT_FLT, a, e ) ;
|
|
|
493 |
return ( e ) ;
|
|
|
494 |
}
|
|
|
495 |
|
|
|
496 |
|
|
|
497 |
/*
|
|
|
498 |
CONSTRUCT AN UNRESOLVED CAST EXPRESSION
|
|
|
499 |
|
|
|
500 |
This routine creates an expression for casting the expression a to
|
|
|
501 |
type t using cast where either t or the type of a depends on a
|
|
|
502 |
template parameter type.
|
|
|
503 |
*/
|
|
|
504 |
|
|
|
505 |
EXP cast_templ_type
|
|
|
506 |
PROTO_N ( ( t, a, cast ) )
|
|
|
507 |
PROTO_T ( TYPE t X EXP a X unsigned cast )
|
|
|
508 |
{
|
|
|
509 |
EXP e ;
|
|
|
510 |
int op ;
|
|
|
511 |
switch ( cast ) {
|
|
|
512 |
case CAST_IMPLICIT : op = lex_implicit ; break ;
|
|
|
513 |
case CAST_STATIC : op = lex_static_Hcast ; break ;
|
|
|
514 |
case CAST_REINTERP : op = lex_reinterpret_Hcast ; break ;
|
|
|
515 |
case CAST_CONST : op = lex_const_Hcast ; break ;
|
|
|
516 |
default : op = lex_cast ; break ;
|
|
|
517 |
}
|
|
|
518 |
t = rvalue_type ( t ) ;
|
|
|
519 |
MAKE_exp_op ( t, op, a, NULL_exp, e ) ;
|
|
|
520 |
return ( e ) ;
|
|
|
521 |
}
|
|
|
522 |
|
|
|
523 |
|
|
|
524 |
/*
|
|
|
525 |
REPORT CASTING AWAY CONST-NESS
|
|
|
526 |
|
|
|
527 |
This routine adds an error to the end of err if the value qual returned
|
|
|
528 |
by check_qualifier indicates that a particular conversion casts away
|
|
|
529 |
const-ness (or volatile-ness).
|
|
|
530 |
*/
|
|
|
531 |
|
|
|
532 |
void cast_away_const
|
|
|
533 |
PROTO_N ( ( qual, err, cast ) )
|
|
|
534 |
PROTO_T ( unsigned qual X ERROR *err X unsigned cast )
|
|
|
535 |
{
|
|
|
536 |
if ( !( cast & CAST_CONST ) ) {
|
|
|
537 |
CV_SPEC cv = cv_none ;
|
|
|
538 |
if ( !( qual & QUAL_CONST ) ) cv |= cv_const ;
|
|
|
539 |
if ( !( qual & QUAL_VOLATILE ) ) cv |= cv_volatile ;
|
|
|
540 |
if ( cv == cv_none ) {
|
|
|
541 |
if ( !( qual & QUAL_ALL_CONST ) ) {
|
|
|
542 |
add_error ( err, ERR_conv_qual_multi () ) ;
|
|
|
543 |
}
|
|
|
544 |
} else {
|
|
|
545 |
add_error ( err, ERR_conv_qual_cast ( cv ) ) ;
|
|
|
546 |
}
|
|
|
547 |
}
|
|
|
548 |
return ;
|
|
|
549 |
}
|
|
|
550 |
|
|
|
551 |
|
|
|
552 |
/*
|
|
|
553 |
CREATE A BASE CAST EXPRESSION
|
|
|
554 |
|
|
|
555 |
This routine creates a base cast expression for converting the
|
|
|
556 |
expression a to type t using the offset off. If off is a zero offset
|
|
|
557 |
(indicating single inheritance) or the type of a can be statically
|
|
|
558 |
determined then this is a simple add_ptr operation. Otherwise a
|
|
|
559 |
base_cast expression is used. Note that a dummy expression is
|
|
|
560 |
introduced to represent the argument.
|
|
|
561 |
*/
|
|
|
562 |
|
|
|
563 |
EXP make_base_cast
|
|
|
564 |
PROTO_N ( ( t, a, off ) )
|
|
|
565 |
PROTO_T ( TYPE t X EXP a X OFFSET off )
|
|
|
566 |
{
|
|
|
567 |
EXP e ;
|
|
|
568 |
if ( is_zero_offset ( off ) || know_type ( a ) == 1 ) {
|
|
|
569 |
MAKE_exp_add_ptr ( t, a, off, 0, e ) ;
|
|
|
570 |
} else {
|
|
|
571 |
TYPE s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
572 |
if ( !IS_type_ptr ( s ) ) s = t ;
|
|
|
573 |
MAKE_exp_dummy ( s, a, LINK_NONE, NULL_off, 1, a ) ;
|
|
|
574 |
MAKE_exp_base_cast ( t, CONV_PTR_BASE, a, off, e ) ;
|
|
|
575 |
}
|
|
|
576 |
return ( e ) ;
|
|
|
577 |
}
|
|
|
578 |
|
|
|
579 |
|
|
|
580 |
/*
|
|
|
581 |
PERFORM A POINTER-POINTER CONVERSION
|
|
|
582 |
|
|
|
583 |
This routine converts the pointer expression a to the pointer type t.
|
|
|
584 |
Pointers can be partitioned into pointer to object, pointer to function
|
|
|
585 |
and void * for the purposes of pointer casts. Note that even identity
|
|
|
586 |
function casts are always performed. This is to prevent further function
|
|
|
587 |
overload resolution and to inherit any default arguments from t. Also
|
|
|
588 |
if force is true then an identity explicit cast is inserted after any
|
|
|
589 |
base pointer cast. This is to allow for TDF operations such as
|
|
|
590 |
pointer_test which require exact equality of alignments.
|
|
|
591 |
*/
|
|
|
592 |
|
|
|
593 |
EXP cast_ptr_ptr
|
|
|
594 |
PROTO_N ( ( t, a, err, cast, safe, force ) )
|
|
|
595 |
PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast X
|
|
|
596 |
int safe X int force )
|
|
|
597 |
{
|
|
|
598 |
EXP e ;
|
|
|
599 |
int opt ;
|
|
|
600 |
unsigned qual ;
|
|
|
601 |
OFFSET off = NULL_off ;
|
|
|
602 |
unsigned conv = CONV_NONE ;
|
|
|
603 |
TYPE s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
604 |
TYPE pt = DEREF_type ( type_ptr_sub ( t ) ) ;
|
|
|
605 |
TYPE ps = DEREF_type ( type_ptr_sub ( s ) ) ;
|
|
|
606 |
unsigned nt = TAG_type ( pt ) ;
|
|
|
607 |
unsigned ns = TAG_type ( ps ) ;
|
|
|
608 |
|
|
|
609 |
/* Allow for tokenised types */
|
|
|
610 |
if ( nt == type_token_tag ) {
|
|
|
611 |
t = expand_type ( t, 1 ) ;
|
|
|
612 |
pt = DEREF_type ( type_ptr_sub ( t ) ) ;
|
|
|
613 |
nt = TAG_type ( pt ) ;
|
|
|
614 |
}
|
|
|
615 |
if ( ns == type_token_tag ) {
|
|
|
616 |
s = expand_type ( s, 1 ) ;
|
|
|
617 |
ps = DEREF_type ( type_ptr_sub ( s ) ) ;
|
|
|
618 |
ns = TAG_type ( ps ) ;
|
|
|
619 |
}
|
|
|
620 |
|
|
|
621 |
/* Check for qualifier conversions */
|
|
|
622 |
qual = check_qualifier ( t, s, safe ) ;
|
|
|
623 |
if ( qual == QUAL_EQUAL ) {
|
|
|
624 |
/* Allow for type equality */
|
|
|
625 |
if ( cast != CAST_IMPLICIT ) a = cast_exact ( t, a ) ;
|
|
|
626 |
return ( a ) ;
|
|
|
627 |
}
|
|
|
628 |
if ( qual == QUAL_EQ_FUNC ) {
|
|
|
629 |
/* Allow for equality of function types */
|
|
|
630 |
if ( !( cast & CAST_REINTERP ) && !eq_except ( ps, pt ) ) {
|
|
|
631 |
add_error ( err, ERR_except_spec_assign () ) ;
|
|
|
632 |
}
|
|
|
633 |
e = cast_exact ( t, a ) ;
|
|
|
634 |
return ( e ) ;
|
|
|
635 |
}
|
|
|
636 |
if ( qual & QUAL_TEMPL ) {
|
|
|
637 |
/* Conversion depends on template parameter */
|
|
|
638 |
e = cast_templ_type ( t, a, cast ) ;
|
|
|
639 |
return ( e ) ;
|
|
|
640 |
}
|
|
|
641 |
if ( !( qual & QUAL_CONST ) ) {
|
|
|
642 |
/* Check for string literal conversions */
|
|
|
643 |
if ( IS_exp_address ( a ) && ns == type_integer_tag ) {
|
|
|
644 |
EXP b = DEREF_exp ( exp_address_arg ( a ) ) ;
|
|
|
645 |
if ( IS_exp_string_lit ( b ) ) {
|
|
|
646 |
/* Remove const and try again */
|
|
|
647 |
int str = 1 ;
|
|
|
648 |
if ( !( cast & CAST_CONST ) ) str = 2 ;
|
|
|
649 |
a = convert_array ( b, str, err ) ;
|
|
|
650 |
e = cast_ptr_ptr ( t, a, err, cast, safe, force ) ;
|
|
|
651 |
return ( e ) ;
|
|
|
652 |
}
|
|
|
653 |
}
|
|
|
654 |
}
|
|
|
655 |
if ( !( qual & QUAL_VOLATILE ) && used_extern_volatile ) {
|
|
|
656 |
/* Check for implicitly volatile external objects */
|
|
|
657 |
EXP pa = NULL_exp ;
|
|
|
658 |
DECL_SPEC ds = find_exp_linkage ( a, &pa, 1 ) ;
|
|
|
659 |
if ( ds & dspec_implicit ) qual |= QUAL_VOLATILE ;
|
|
|
660 |
}
|
|
|
661 |
|
|
|
662 |
/* Check conversion */
|
|
|
663 |
if ( qual & QUAL_SIMILAR ) {
|
|
|
664 |
/* Simple qualification conversions */
|
|
|
665 |
opt = OPT_none ;
|
|
|
666 |
conv = CONV_QUAL ;
|
|
|
667 |
} else {
|
|
|
668 |
/* Other pointer conversions */
|
|
|
669 |
ERROR ferr = NULL_err ;
|
|
|
670 |
switch ( nt ) {
|
|
|
671 |
case type_top_tag :
|
|
|
672 |
case type_bottom_tag :
|
|
|
673 |
generic_lab : {
|
|
|
674 |
if ( ns == type_func_tag ) {
|
|
|
675 |
/* Conversion from 'function *' to 'void *' */
|
|
|
676 |
ERROR err2 = ERR_expr_cast_reint_func_ptr ( s, t ) ;
|
|
|
677 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
678 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
679 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
680 |
}
|
|
|
681 |
}
|
|
|
682 |
if ( ns == type_top_tag || ns == type_bottom_tag ) {
|
|
|
683 |
/* Conversion from 'void *' to 'void *' */
|
|
|
684 |
opt = OPT_none ;
|
|
|
685 |
if ( nt == type_integer_tag ) {
|
|
|
686 |
conv = ( CONV_PTR_VOID | CONV_REVERSE ) ;
|
|
|
687 |
} else {
|
|
|
688 |
conv = CONV_EXACT ;
|
|
|
689 |
}
|
|
|
690 |
} else {
|
|
|
691 |
/* Conversion from 'object *' to 'void *' */
|
|
|
692 |
TYPE r = NULL_type ;
|
|
|
693 |
if ( ns == type_integer_tag ) {
|
|
|
694 |
/* Check for generic pointers */
|
|
|
695 |
r = type_void_star ;
|
|
|
696 |
r = type_composite ( s, r, 1, 0, &ferr, 0 ) ;
|
|
|
697 |
}
|
|
|
698 |
if ( !IS_NULL_type ( r ) ) {
|
|
|
699 |
opt = OPT_none ;
|
|
|
700 |
} else if ( cast == CAST_IMPLICIT ) {
|
|
|
701 |
opt = OPT_conv_ptr_ptr_void ;
|
|
|
702 |
} else if ( cast == CAST_CONST ) {
|
|
|
703 |
opt = OPT_error ;
|
|
|
704 |
} else {
|
|
|
705 |
opt = OPT_none ;
|
|
|
706 |
}
|
|
|
707 |
if ( nt != type_integer_tag ) conv = CONV_PTR_VOID ;
|
|
|
708 |
}
|
|
|
709 |
break ;
|
|
|
710 |
}
|
|
|
711 |
case type_compound_tag : {
|
|
|
712 |
if ( cast == CAST_CONST || cast == CAST_REINTERP ) {
|
|
|
713 |
goto default_lab ;
|
|
|
714 |
}
|
|
|
715 |
if ( ns == type_compound_tag ) {
|
|
|
716 |
/* Conversion from 'class *' to 'class *' */
|
|
|
717 |
GRAPH gr ;
|
|
|
718 |
CLASS_TYPE ct, cs ;
|
|
|
719 |
ct = DEREF_ctype ( type_compound_defn ( pt ) ) ;
|
|
|
720 |
cs = DEREF_ctype ( type_compound_defn ( ps ) ) ;
|
|
|
721 |
gr = find_base_class ( cs, ct, 1 ) ;
|
|
|
722 |
if ( !IS_NULL_graph ( gr ) ) {
|
|
|
723 |
/* Base class conversion */
|
|
|
724 |
ERROR err2 = check_ambig_base ( gr ) ;
|
|
|
725 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
726 |
/* Can't be ambiguous */
|
|
|
727 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
728 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
729 |
add_error ( err, ERR_conv_ptr_ambiguous () ) ;
|
|
|
730 |
}
|
|
|
731 |
if ( !( cast & CAST_BAD ) ) {
|
|
|
732 |
/* Check base access */
|
|
|
733 |
check_base_access ( gr ) ;
|
|
|
734 |
}
|
|
|
735 |
off = DEREF_off ( graph_off ( gr ) ) ;
|
|
|
736 |
conv = CONV_PTR_BASE ;
|
|
|
737 |
opt = OPT_none ;
|
|
|
738 |
break ;
|
|
|
739 |
}
|
|
|
740 |
if ( cast & CAST_STATIC ) {
|
|
|
741 |
gr = find_base_class ( ct, cs, 1 ) ;
|
|
|
742 |
if ( !IS_NULL_graph ( gr ) ) {
|
|
|
743 |
/* Reverse base class conversion */
|
|
|
744 |
ERROR err2 = check_ambig_base ( gr ) ;
|
|
|
745 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
746 |
/* Can't be ambiguous */
|
|
|
747 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
748 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
749 |
add_error ( err, ERR_conv_ptr_ambiguous () ) ;
|
|
|
750 |
}
|
|
|
751 |
err2 = check_virt_base ( gr ) ;
|
|
|
752 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
753 |
/* Can't be virtual */
|
|
|
754 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
755 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
756 |
add_error ( err, ERR_expr_cast_stat_virt () ) ;
|
|
|
757 |
}
|
|
|
758 |
if ( !( cast & CAST_BAD ) ) {
|
|
|
759 |
/* Check base access */
|
|
|
760 |
check_base_access ( gr ) ;
|
|
|
761 |
}
|
|
|
762 |
off = DEREF_off ( graph_off ( gr ) ) ;
|
|
|
763 |
conv = ( CONV_PTR_BASE | CONV_REVERSE ) ;
|
|
|
764 |
opt = OPT_none ;
|
|
|
765 |
break ;
|
|
|
766 |
}
|
|
|
767 |
}
|
|
|
768 |
}
|
|
|
769 |
goto default_lab ;
|
|
|
770 |
}
|
|
|
771 |
case type_func_tag : {
|
|
|
772 |
if ( ns != type_func_tag ) {
|
|
|
773 |
/* Conversion from 'function *' to 'object *' */
|
|
|
774 |
ERROR err2 = ERR_expr_cast_reint_func_ptr ( s, t ) ;
|
|
|
775 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
776 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
777 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
778 |
}
|
|
|
779 |
goto object_lab ;
|
|
|
780 |
}
|
|
|
781 |
/* Conversion from 'function *' to 'function *' */
|
|
|
782 |
if ( cast & CAST_REINTERP ) {
|
|
|
783 |
opt = OPT_conv_ptr_ptr_expl ;
|
|
|
784 |
} else {
|
|
|
785 |
opt = OPT_conv_ptr_ptr_impl ;
|
|
|
786 |
}
|
|
|
787 |
conv = CONV_FUNC ;
|
|
|
788 |
break ;
|
|
|
789 |
}
|
|
|
790 |
case type_integer_tag : {
|
|
|
791 |
/* Check for generic pointers */
|
|
|
792 |
TYPE r = type_void_star ;
|
|
|
793 |
r = type_composite ( t, r, 1, 0, &ferr, 0 ) ;
|
|
|
794 |
if ( !IS_NULL_type ( r ) ) goto generic_lab ;
|
|
|
795 |
goto default_lab ;
|
|
|
796 |
}
|
|
|
797 |
default :
|
|
|
798 |
default_lab : {
|
|
|
799 |
if ( ns == type_func_tag ) {
|
|
|
800 |
/* Conversion from 'function *' to 'object *' */
|
|
|
801 |
ERROR err2 = ERR_expr_cast_reint_func_ptr ( s, t ) ;
|
|
|
802 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
803 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
804 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
805 |
}
|
|
|
806 |
}
|
|
|
807 |
goto object_lab ;
|
|
|
808 |
}
|
|
|
809 |
object_lab : {
|
|
|
810 |
TYPE r = NULL_type ;
|
|
|
811 |
if ( ns == type_integer_tag ) {
|
|
|
812 |
/* Check for generic pointers */
|
|
|
813 |
r = type_void_star ;
|
|
|
814 |
r = type_composite ( s, r, 1, 0, &ferr, 0 ) ;
|
|
|
815 |
}
|
|
|
816 |
if ( IS_NULL_type ( r ) ) {
|
|
|
817 |
if ( ns != type_top_tag && ns != type_bottom_tag ) {
|
|
|
818 |
/* Conversion from 'object *' to 'object *' */
|
|
|
819 |
if ( cast & CAST_REINTERP ) {
|
|
|
820 |
opt = OPT_conv_ptr_ptr_expl ;
|
|
|
821 |
} else {
|
|
|
822 |
opt = OPT_conv_ptr_ptr_impl ;
|
|
|
823 |
}
|
|
|
824 |
break ;
|
|
|
825 |
}
|
|
|
826 |
}
|
|
|
827 |
/* Conversion from 'void *' to 'object *' */
|
|
|
828 |
if ( cast == CAST_IMPLICIT ) {
|
|
|
829 |
opt = OPT_conv_ptr_void_ptr ;
|
|
|
830 |
} else if ( cast == CAST_CONST ) {
|
|
|
831 |
opt = OPT_error ;
|
|
|
832 |
} else {
|
|
|
833 |
opt = OPT_none ;
|
|
|
834 |
}
|
|
|
835 |
if ( IS_NULL_type ( r ) ) {
|
|
|
836 |
conv = ( CONV_PTR_VOID | CONV_REVERSE ) ;
|
|
|
837 |
}
|
|
|
838 |
break ;
|
|
|
839 |
}
|
|
|
840 |
}
|
|
|
841 |
|
|
|
842 |
/* Add generic pointer errors */
|
|
|
843 |
if ( !IS_NULL_err ( ferr ) ) {
|
|
|
844 |
if ( opt == OPT_none ) {
|
|
|
845 |
destroy_error ( ferr, 1 ) ;
|
|
|
846 |
} else {
|
|
|
847 |
add_error ( err, ferr ) ;
|
|
|
848 |
}
|
|
|
849 |
}
|
|
|
850 |
|
|
|
851 |
/* Check for function linkage conversions */
|
|
|
852 |
if ( ( qual & QUAL_FUNC ) && opt == OPT_conv_ptr_ptr_impl ) {
|
|
|
853 |
opt = OPT_func_linkage ;
|
|
|
854 |
}
|
|
|
855 |
}
|
|
|
856 |
|
|
|
857 |
/* Report any conversion errors */
|
|
|
858 |
if ( option ( opt ) ) {
|
|
|
859 |
ERROR err2 ;
|
|
|
860 |
switch ( opt ) {
|
|
|
861 |
case OPT_func_linkage : {
|
|
|
862 |
err2 = ERR_dcl_link_conv () ;
|
|
|
863 |
break ;
|
|
|
864 |
}
|
|
|
865 |
case OPT_conv_ptr_ptr_expl :
|
|
|
866 |
case OPT_conv_ptr_ptr_impl : {
|
|
|
867 |
err2 = ERR_basic_link_incompat ( ps, pt ) ;
|
|
|
868 |
err2 = concat_error ( err2, ERR_conv_ptr_incompat () ) ;
|
|
|
869 |
break ;
|
|
|
870 |
}
|
|
|
871 |
default : {
|
|
|
872 |
err2 = ERR_conv_ptr_cast ( s, t ) ;
|
|
|
873 |
break ;
|
|
|
874 |
}
|
|
|
875 |
}
|
|
|
876 |
err2 = set_severity ( err2, opt, 0 ) ;
|
|
|
877 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
878 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
879 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
880 |
}
|
|
|
881 |
}
|
|
|
882 |
if ( qual != QUAL_OK ) cast_away_const ( qual, err, cast ) ;
|
|
|
883 |
|
|
|
884 |
/* Construct the result */
|
|
|
885 |
if ( IS_exp_null ( a ) ) {
|
|
|
886 |
/* Deal with null pointers */
|
|
|
887 |
e = make_null_exp ( t ) ;
|
|
|
888 |
} else if ( conv == CONV_PTR_BASE ) {
|
|
|
889 |
/* Deal with base class conversions */
|
|
|
890 |
e = make_base_cast ( t, a, off ) ;
|
|
|
891 |
if ( force ) {
|
|
|
892 |
/* Force pointer cast */
|
|
|
893 |
conv = ( CONV_PTR_PTR | CONV_REVERSE ) ;
|
|
|
894 |
MAKE_exp_cast ( t, conv, e, e ) ;
|
|
|
895 |
}
|
|
|
896 |
} else if ( conv == ( CONV_PTR_BASE | CONV_REVERSE ) ) {
|
|
|
897 |
/* Deal with reverse base class conversions */
|
|
|
898 |
MAKE_exp_cast ( t, CONV_PTR_PTR, a, a ) ;
|
|
|
899 |
if ( is_zero_offset ( off ) ) {
|
|
|
900 |
e = a ;
|
|
|
901 |
} else {
|
|
|
902 |
MAKE_exp_dummy ( t, a, LINK_NONE, NULL_off, 1, a ) ;
|
|
|
903 |
MAKE_exp_base_cast ( t, conv, a, off, e ) ;
|
|
|
904 |
if ( force ) {
|
|
|
905 |
/* Force pointer cast */
|
|
|
906 |
conv = ( CONV_PTR_PTR | CONV_REVERSE ) ;
|
|
|
907 |
MAKE_exp_cast ( t, conv, e, e ) ;
|
|
|
908 |
}
|
|
|
909 |
}
|
|
|
910 |
} else {
|
|
|
911 |
if ( conv == CONV_NONE ) {
|
|
|
912 |
if ( eq_type_offset ( pt, ps ) ) {
|
|
|
913 |
conv = CONV_PTR_PTR_ALIGN ;
|
|
|
914 |
} else {
|
|
|
915 |
conv = CONV_PTR_PTR ;
|
|
|
916 |
}
|
|
|
917 |
}
|
|
|
918 |
MAKE_exp_cast ( t, conv, a, e ) ;
|
|
|
919 |
}
|
|
|
920 |
return ( e ) ;
|
|
|
921 |
}
|
|
|
922 |
|
|
|
923 |
|
|
|
924 |
/*
|
|
|
925 |
PERFORM A INTEGER-POINTER CONVERSION
|
|
|
926 |
|
|
|
927 |
This routine converts the integral expression a to the pointer type t.
|
|
|
928 |
There are two cases, depending on whether a represents a null pointer.
|
|
|
929 |
*/
|
|
|
930 |
|
|
|
931 |
static EXP cast_int_ptr
|
|
|
932 |
PROTO_N ( ( t, a, err, cast, nptr ) )
|
|
|
933 |
PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast X int nptr )
|
|
|
934 |
{
|
|
|
935 |
EXP e ;
|
|
|
936 |
int opt ;
|
|
|
937 |
if ( nptr && ( cast == CAST_IMPLICIT || ( cast & CAST_STATIC ) ) ) {
|
|
|
938 |
/* Deal with null pointers */
|
|
|
939 |
EXP b = make_null_ptr ( a, t ) ;
|
|
|
940 |
if ( !IS_NULL_exp ( b ) ) return ( b ) ;
|
|
|
941 |
}
|
|
|
942 |
if ( cast & CAST_REINTERP ) {
|
|
|
943 |
opt = OPT_conv_int_ptr_expl ;
|
|
|
944 |
} else {
|
|
|
945 |
opt = OPT_conv_int_ptr_impl ;
|
|
|
946 |
}
|
|
|
947 |
if ( option ( opt ) ) {
|
|
|
948 |
TYPE s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
949 |
ERROR err2 = ERR_conv_ptr_nonzero ( s, t ) ;
|
|
|
950 |
err2 = set_severity ( err2, opt, 0 ) ;
|
|
|
951 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
952 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
953 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
954 |
}
|
|
|
955 |
}
|
|
|
956 |
MAKE_exp_cast ( t, CONV_INT_PTR, a, e ) ;
|
|
|
957 |
return ( e ) ;
|
|
|
958 |
}
|
|
|
959 |
|
|
|
960 |
|
|
|
961 |
/*
|
|
|
962 |
PERFORM A POINTER-INTEGER CONVERSION
|
|
|
963 |
|
|
|
964 |
This routine converts the pointer expression a to the integral type t
|
|
|
965 |
(which will not be bool).
|
|
|
966 |
*/
|
|
|
967 |
|
|
|
968 |
static EXP cast_ptr_int
|
|
|
969 |
PROTO_N ( ( t, a, err, cast ) )
|
|
|
970 |
PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast )
|
|
|
971 |
{
|
|
|
972 |
EXP e ;
|
|
|
973 |
int opt ;
|
|
|
974 |
if ( IS_exp_null ( a ) ) {
|
|
|
975 |
if ( cast & CAST_STATIC ) {
|
|
|
976 |
MAKE_exp_cast ( t, CONV_NULL, a, e ) ;
|
|
|
977 |
return ( e ) ;
|
|
|
978 |
}
|
|
|
979 |
}
|
|
|
980 |
if ( cast & CAST_REINTERP ) {
|
|
|
981 |
opt = OPT_conv_int_ptr_expl ;
|
|
|
982 |
} else {
|
|
|
983 |
opt = OPT_conv_int_ptr_impl ;
|
|
|
984 |
}
|
|
|
985 |
if ( option ( opt ) ) {
|
|
|
986 |
TYPE s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
987 |
ERROR err2 = ERR_expr_cast_reint_ptr_int ( s, t ) ;
|
|
|
988 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
989 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
990 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
991 |
}
|
|
|
992 |
}
|
|
|
993 |
MAKE_exp_cast ( t, CONV_PTR_INT, a, e ) ;
|
|
|
994 |
return ( e ) ;
|
|
|
995 |
}
|
|
|
996 |
|
|
|
997 |
|
|
|
998 |
/*
|
|
|
999 |
PERFORM A POINTER MEMBER-POINTER MEMBER CONVERSION
|
|
|
1000 |
|
|
|
1001 |
This routine converts the pointer to member expression a to the pointer
|
|
|
1002 |
to member type t. force is as in cast_ptr_ptr.
|
|
|
1003 |
*/
|
|
|
1004 |
|
|
|
1005 |
EXP cast_ptr_mem_ptr_mem
|
|
|
1006 |
PROTO_N ( ( t, a, err, cast, safe, force ) )
|
|
|
1007 |
PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast X
|
|
|
1008 |
int safe X int force )
|
|
|
1009 |
{
|
|
|
1010 |
EXP e ;
|
|
|
1011 |
int ok = 2 ;
|
|
|
1012 |
unsigned conv = CONV_EXACT ;
|
|
|
1013 |
TYPE s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
1014 |
|
|
|
1015 |
if ( cast != CAST_REINTERP ) {
|
|
|
1016 |
/* Check for base class conversions */
|
|
|
1017 |
OFFSET off = NULL_off ;
|
|
|
1018 |
CLASS_TYPE ct = DEREF_ctype ( type_ptr_mem_of ( t ) ) ;
|
|
|
1019 |
CLASS_TYPE cs = DEREF_ctype ( type_ptr_mem_of ( s ) ) ;
|
|
|
1020 |
if ( !eq_ctype ( ct, cs ) ) {
|
|
|
1021 |
GRAPH gr = find_base_class ( ct, cs, 1 ) ;
|
|
|
1022 |
if ( !IS_NULL_graph ( gr ) ) {
|
|
|
1023 |
/* cs is a base class of ct */
|
|
|
1024 |
ERROR err2 = check_ambig_base ( gr ) ;
|
|
|
1025 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1026 |
/* Can't be ambiguous */
|
|
|
1027 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
1028 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
1029 |
add_error ( err, ERR_conv_mem_ambiguous () ) ;
|
|
|
1030 |
}
|
|
|
1031 |
err2 = check_virt_base ( gr ) ;
|
|
|
1032 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1033 |
/* Can't be virtual */
|
|
|
1034 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
1035 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
1036 |
add_error ( err, ERR_conv_mem_virtual () ) ;
|
|
|
1037 |
}
|
|
|
1038 |
if ( !( cast & CAST_BAD ) ) {
|
|
|
1039 |
/* Check base access */
|
|
|
1040 |
check_base_access ( gr ) ;
|
|
|
1041 |
}
|
|
|
1042 |
off = DEREF_off ( graph_off ( gr ) ) ;
|
|
|
1043 |
conv = CONV_PTR_MEM_BASE ;
|
|
|
1044 |
ok = 1 ;
|
|
|
1045 |
} else {
|
|
|
1046 |
/* cs is not a base class of ct */
|
|
|
1047 |
if ( cast & CAST_STATIC ) {
|
|
|
1048 |
gr = find_base_class ( cs, ct, 1 ) ;
|
|
|
1049 |
if ( !IS_NULL_graph ( gr ) ) {
|
|
|
1050 |
/* ct is a base class of cs */
|
|
|
1051 |
ERROR err2 = check_ambig_base ( gr ) ;
|
|
|
1052 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1053 |
/* Can't be ambiguous */
|
|
|
1054 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
1055 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
1056 |
add_error ( err, ERR_conv_mem_ambiguous () ) ;
|
|
|
1057 |
}
|
|
|
1058 |
err2 = check_virt_base ( gr ) ;
|
|
|
1059 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1060 |
/* Can't be virtual */
|
|
|
1061 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
1062 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
1063 |
add_error ( err, ERR_conv_mem_virtual () ) ;
|
|
|
1064 |
}
|
|
|
1065 |
if ( !( cast & CAST_BAD ) ) {
|
|
|
1066 |
/* Check base access */
|
|
|
1067 |
check_base_access ( gr ) ;
|
|
|
1068 |
}
|
|
|
1069 |
off = DEREF_off ( graph_off ( gr ) ) ;
|
|
|
1070 |
conv = ( CONV_PTR_MEM_BASE | CONV_REVERSE ) ;
|
|
|
1071 |
ok = 1 ;
|
|
|
1072 |
} else {
|
|
|
1073 |
ok = 0 ;
|
|
|
1074 |
}
|
|
|
1075 |
} else {
|
|
|
1076 |
ok = 0 ;
|
|
|
1077 |
}
|
|
|
1078 |
}
|
|
|
1079 |
|
|
|
1080 |
if ( ok == 0 && in_template_decl ) {
|
|
|
1081 |
/* Allow for template parameter types */
|
|
|
1082 |
TYPE ft = DEREF_type ( ctype_form ( ct ) ) ;
|
|
|
1083 |
TYPE fs = DEREF_type ( ctype_form ( cs ) ) ;
|
|
|
1084 |
if ( is_templ_depend ( ft ) || is_templ_depend ( fs ) ) {
|
|
|
1085 |
/* Check further */
|
|
|
1086 |
ok = -1 ;
|
|
|
1087 |
}
|
|
|
1088 |
}
|
|
|
1089 |
}
|
|
|
1090 |
|
|
|
1091 |
/* Check for qualification conversions */
|
|
|
1092 |
if ( ok ) {
|
|
|
1093 |
unsigned qual ;
|
|
|
1094 |
TYPE pt = DEREF_type ( type_ptr_mem_sub ( t ) ) ;
|
|
|
1095 |
TYPE ps = DEREF_type ( type_ptr_mem_sub ( s ) ) ;
|
|
|
1096 |
if ( IS_type_token ( pt ) ) {
|
|
|
1097 |
t = expand_type ( t, 1 ) ;
|
|
|
1098 |
}
|
|
|
1099 |
if ( IS_type_token ( ps ) ) {
|
|
|
1100 |
s = expand_type ( s, 1 ) ;
|
|
|
1101 |
}
|
|
|
1102 |
qual = check_qualifier ( t, s, safe ) ;
|
|
|
1103 |
if ( qual == QUAL_EQUAL ) {
|
|
|
1104 |
/* Type equality */
|
|
|
1105 |
if ( ok == 2 ) {
|
|
|
1106 |
if ( cast != CAST_IMPLICIT ) a = cast_exact ( t, a ) ;
|
|
|
1107 |
return ( a ) ;
|
|
|
1108 |
}
|
|
|
1109 |
qual = QUAL_OK ;
|
|
|
1110 |
} else if ( qual == QUAL_EQ_FUNC ) {
|
|
|
1111 |
/* Function type equality */
|
|
|
1112 |
if ( !( cast & CAST_REINTERP ) && !eq_except ( ps, pt ) ) {
|
|
|
1113 |
/* Exception specifications don't match */
|
|
|
1114 |
add_error ( err, ERR_except_spec_assign () ) ;
|
|
|
1115 |
}
|
|
|
1116 |
if ( ok == 2 ) {
|
|
|
1117 |
e = cast_exact ( t, a ) ;
|
|
|
1118 |
return ( e ) ;
|
|
|
1119 |
}
|
|
|
1120 |
qual = QUAL_OK ;
|
|
|
1121 |
}
|
|
|
1122 |
if ( ( qual & QUAL_TEMPL ) || ok == -1 ) {
|
|
|
1123 |
/* Conversion depends on template parameter */
|
|
|
1124 |
e = cast_templ_type ( t, a, cast ) ;
|
|
|
1125 |
return ( e ) ;
|
|
|
1126 |
}
|
|
|
1127 |
if ( qual & QUAL_SIMILAR ) {
|
|
|
1128 |
/* Check for casting away const-ness */
|
|
|
1129 |
if ( qual != QUAL_OK ) {
|
|
|
1130 |
cast_away_const ( qual, err, cast ) ;
|
|
|
1131 |
}
|
|
|
1132 |
if ( ok == 2 ) {
|
|
|
1133 |
MAKE_exp_cast ( t, CONV_QUAL, a, e ) ;
|
|
|
1134 |
} else {
|
|
|
1135 |
MAKE_exp_dummy ( s, a, LINK_NONE, NULL_off, 1, a ) ;
|
|
|
1136 |
MAKE_exp_base_cast ( t, conv, a, off, e ) ;
|
|
|
1137 |
UNUSED ( force ) ;
|
|
|
1138 |
}
|
|
|
1139 |
return ( e ) ;
|
|
|
1140 |
}
|
|
|
1141 |
ok = 0 ;
|
|
|
1142 |
}
|
|
|
1143 |
}
|
|
|
1144 |
|
|
|
1145 |
/* Check for reinterpret conversions */
|
|
|
1146 |
conv = CONV_NONE ;
|
|
|
1147 |
if ( cast & CAST_REINTERP ) {
|
|
|
1148 |
unsigned nt = TAG_type ( t ) ;
|
|
|
1149 |
unsigned ns = TAG_type ( s ) ;
|
|
|
1150 |
if ( nt == type_func_tag ) {
|
|
|
1151 |
ok = ( ns == type_func_tag ? 1 : 0 ) ;
|
|
|
1152 |
} else {
|
|
|
1153 |
ok = ( ns == type_func_tag ? 0 : 1 ) ;
|
|
|
1154 |
}
|
|
|
1155 |
if ( ok ) {
|
|
|
1156 |
unsigned qual = check_qualifier ( t, s, safe ) ;
|
|
|
1157 |
if ( qual != QUAL_OK ) {
|
|
|
1158 |
cast_away_const ( qual, err, cast ) ;
|
|
|
1159 |
}
|
|
|
1160 |
conv = CONV_PTR_MEM_PTR_MEM ;
|
|
|
1161 |
}
|
|
|
1162 |
}
|
|
|
1163 |
|
|
|
1164 |
/* Invalid cast expression */
|
|
|
1165 |
if ( !ok ) {
|
|
|
1166 |
ERROR err2 = ERR_conv_mem_cast ( s, t ) ;
|
|
|
1167 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1168 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
1169 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
1170 |
}
|
|
|
1171 |
}
|
|
|
1172 |
MAKE_exp_cast ( t, conv, a, e ) ;
|
|
|
1173 |
return ( e ) ;
|
|
|
1174 |
}
|
|
|
1175 |
|
|
|
1176 |
|
|
|
1177 |
/*
|
|
|
1178 |
PERFORM A INTEGER-POINTER MEMBER CONVERSION
|
|
|
1179 |
|
|
|
1180 |
This routine converts the integral expression a to the pointer to
|
|
|
1181 |
member type t. The only valid case is when a is zero.
|
|
|
1182 |
*/
|
|
|
1183 |
|
|
|
1184 |
static EXP cast_int_ptr_mem
|
|
|
1185 |
PROTO_N ( ( t, a, err, cast, nptr ) )
|
|
|
1186 |
PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast X int nptr )
|
|
|
1187 |
{
|
|
|
1188 |
EXP e ;
|
|
|
1189 |
TYPE s ;
|
|
|
1190 |
ERROR err2 ;
|
|
|
1191 |
if ( nptr && ( cast == CAST_IMPLICIT || ( cast & CAST_STATIC ) ) ) {
|
|
|
1192 |
/* Deal with null pointers */
|
|
|
1193 |
EXP b = make_null_ptr ( a, t ) ;
|
|
|
1194 |
if ( !IS_NULL_exp ( b ) ) return ( b ) ;
|
|
|
1195 |
}
|
|
|
1196 |
s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
1197 |
err2 = ERR_conv_mem_nonzero ( s, t ) ;
|
|
|
1198 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1199 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
1200 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
1201 |
}
|
|
|
1202 |
MAKE_exp_cast ( t, CONV_NONE, a, e ) ;
|
|
|
1203 |
return ( e ) ;
|
|
|
1204 |
}
|
|
|
1205 |
|
|
|
1206 |
|
|
|
1207 |
/*
|
|
|
1208 |
PERFORM A POINTER MEMBER-INTEGER CONVERSION
|
|
|
1209 |
|
|
|
1210 |
This routine converts the pointer to member expression a to the
|
|
|
1211 |
integral type t. The only valid case is when a is a null pointer.
|
|
|
1212 |
In all other cases the null expression is returned.
|
|
|
1213 |
*/
|
|
|
1214 |
|
|
|
1215 |
static EXP cast_ptr_mem_int
|
|
|
1216 |
PROTO_N ( ( t, a, err, cast ) )
|
|
|
1217 |
PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast )
|
|
|
1218 |
{
|
|
|
1219 |
if ( IS_exp_null ( a ) ) {
|
|
|
1220 |
if ( cast & CAST_STATIC ) {
|
|
|
1221 |
EXP e ;
|
|
|
1222 |
MAKE_exp_cast ( t, CONV_NULL, a, e ) ;
|
|
|
1223 |
return ( e ) ;
|
|
|
1224 |
}
|
|
|
1225 |
}
|
|
|
1226 |
UNUSED ( err ) ;
|
|
|
1227 |
return ( NULL_exp ) ;
|
|
|
1228 |
}
|
|
|
1229 |
|
|
|
1230 |
|
|
|
1231 |
/*
|
|
|
1232 |
PERFORM A POINTER MEMBER-POINTER CONVERSION
|
|
|
1233 |
|
|
|
1234 |
This routine converts the pointer to member expression a to the
|
|
|
1235 |
pointer type t. The only potentially valid case is casting a pointer
|
|
|
1236 |
to member function to a pointer to function. In all other cases the
|
|
|
1237 |
null expression is returned.
|
|
|
1238 |
*/
|
|
|
1239 |
|
|
|
1240 |
static EXP cast_ptr_mem_ptr
|
|
|
1241 |
PROTO_N ( ( t, a, err, cast ) )
|
|
|
1242 |
PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast )
|
|
|
1243 |
{
|
|
|
1244 |
TYPE s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
1245 |
TYPE p = DEREF_type ( type_ptr_mem_sub ( s ) ) ;
|
|
|
1246 |
TYPE q = DEREF_type ( type_ptr_sub ( t ) ) ;
|
|
|
1247 |
if ( IS_type_func ( p ) && IS_type_func ( q ) ) {
|
|
|
1248 |
if ( cast & CAST_REINTERP ) {
|
|
|
1249 |
EXP e ;
|
|
|
1250 |
ERROR err2 = ERR_expr_cast_reint_mem_func ( s, t ) ;
|
|
|
1251 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1252 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
1253 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
1254 |
}
|
|
|
1255 |
MAKE_exp_cast ( t, CONV_PTR_MEM_FUNC, a, e ) ;
|
|
|
1256 |
return ( e ) ;
|
|
|
1257 |
}
|
|
|
1258 |
}
|
|
|
1259 |
return ( NULL_exp ) ;
|
|
|
1260 |
}
|
|
|
1261 |
|
|
|
1262 |
|
|
|
1263 |
/*
|
|
|
1264 |
PERFORM A CLASS-CLASS CONVERSION
|
|
|
1265 |
|
|
|
1266 |
This routine performs any base class conversion of the class object
|
|
|
1267 |
a to the class t. ref is true if this is a reference binding. The
|
|
|
1268 |
null expression is returned if no such conversion is possible.
|
|
|
1269 |
*/
|
|
|
1270 |
|
|
|
1271 |
EXP cast_class_class
|
|
|
1272 |
PROTO_N ( ( t, a, err, cast, ref ) )
|
|
|
1273 |
PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast X int ref )
|
|
|
1274 |
{
|
|
|
1275 |
EXP e = NULL_exp ;
|
|
|
1276 |
TYPE s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
1277 |
CLASS_TYPE ct = DEREF_ctype ( type_compound_defn ( t ) ) ;
|
|
|
1278 |
CLASS_TYPE cs = DEREF_ctype ( type_compound_defn ( s ) ) ;
|
|
|
1279 |
if ( eq_ctype ( cs, ct ) ) {
|
|
|
1280 |
e = a ;
|
|
|
1281 |
} else {
|
|
|
1282 |
GRAPH gr = find_base_class ( cs, ct, 1 ) ;
|
|
|
1283 |
if ( !IS_NULL_graph ( gr ) ) {
|
|
|
1284 |
/* Allow for base class conversions */
|
|
|
1285 |
TYPE p ;
|
|
|
1286 |
CV_SPEC cv = DEREF_cv ( type_qual ( s ) ) ;
|
|
|
1287 |
OFFSET off = DEREF_off ( graph_off ( gr ) ) ;
|
|
|
1288 |
ERROR err2 = check_ambig_base ( gr ) ;
|
|
|
1289 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1290 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
1291 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
1292 |
add_error ( err, ERR_dcl_init_ref_ambig () ) ;
|
|
|
1293 |
}
|
|
|
1294 |
check_base_access ( gr ) ;
|
|
|
1295 |
p = rvalue_type ( t ) ;
|
|
|
1296 |
MAKE_type_ptr ( cv_none, p, p ) ;
|
|
|
1297 |
if ( !( cv & cv_lvalue ) ) {
|
|
|
1298 |
/* Introduce temporary if necessary */
|
|
|
1299 |
a = make_temporary ( s, a, NULL_exp, 0, err ) ;
|
|
|
1300 |
}
|
|
|
1301 |
MAKE_exp_address ( p, a, e ) ;
|
|
|
1302 |
e = make_base_cast ( p, e, off ) ;
|
|
|
1303 |
t = lvalue_type ( t ) ;
|
|
|
1304 |
MAKE_exp_indir ( t, e, e ) ;
|
|
|
1305 |
}
|
|
|
1306 |
}
|
|
|
1307 |
if ( !IS_NULL_exp ( e ) ) {
|
|
|
1308 |
if ( ref ) {
|
|
|
1309 |
/* Check cv-qualifiers */
|
|
|
1310 |
CV_SPEC cv = cv_compare ( t, s ) ;
|
|
|
1311 |
if ( cv ) add_error ( err, ERR_dcl_init_ref_qual ( cv ) ) ;
|
|
|
1312 |
} else {
|
|
|
1313 |
e = convert_lvalue ( e ) ;
|
|
|
1314 |
}
|
|
|
1315 |
if ( cast != CAST_IMPLICIT && err != KILL_err ) {
|
|
|
1316 |
/* Can't have explicit cast in C */
|
|
|
1317 |
*err = concat_error ( ERR_expr_cast_expl_scalar ( t ), *err ) ;
|
|
|
1318 |
}
|
|
|
1319 |
}
|
|
|
1320 |
return ( e ) ;
|
|
|
1321 |
}
|
|
|
1322 |
|
|
|
1323 |
|
|
|
1324 |
/*
|
|
|
1325 |
CONSTRUCT A CAST EXPRESSION
|
|
|
1326 |
|
|
|
1327 |
This routine constructs a cast expression for converting the expression
|
|
|
1328 |
a to the type t. Any errors are added to the end of the position given
|
|
|
1329 |
by err.
|
|
|
1330 |
*/
|
|
|
1331 |
|
|
|
1332 |
EXP cast_exp
|
|
|
1333 |
PROTO_N ( ( t, a, err, cast ) )
|
|
|
1334 |
PROTO_T ( TYPE t X EXP a X ERROR *err X unsigned cast )
|
|
|
1335 |
{
|
|
|
1336 |
TYPE s ;
|
|
|
1337 |
CV_SPEC cv ;
|
|
|
1338 |
unsigned ns ;
|
|
|
1339 |
EXP e = NULL_exp ;
|
|
|
1340 |
int usr = LANGUAGE_CPP ;
|
|
|
1341 |
unsigned nt = TAG_type ( t ) ;
|
|
|
1342 |
|
|
|
1343 |
/* Deal with tokenised types */
|
|
|
1344 |
if ( nt == type_token_tag ) {
|
|
|
1345 |
if ( is_templ_type ( t ) ) {
|
|
|
1346 |
e = cast_templ_type ( t, a, cast ) ;
|
|
|
1347 |
return ( e ) ;
|
|
|
1348 |
}
|
|
|
1349 |
t = expand_type ( t, 0 ) ;
|
|
|
1350 |
nt = TAG_type ( t ) ;
|
|
|
1351 |
}
|
|
|
1352 |
|
|
|
1353 |
/* Deal with reference conversions */
|
|
|
1354 |
if ( nt == type_ref_tag ) {
|
|
|
1355 |
/* Transform 'cast <t&> (a)' to '*cast <t*> (&a)' */
|
|
|
1356 |
ERROR err2 = NULL_err ;
|
|
|
1357 |
TYPE p = DEREF_type ( type_ref_sub ( t ) ) ;
|
|
|
1358 |
if ( is_templ_type ( p ) ) {
|
|
|
1359 |
e = cast_templ_type ( t, a, cast ) ;
|
|
|
1360 |
return ( e ) ;
|
|
|
1361 |
}
|
|
|
1362 |
p = rvalue_type ( p ) ;
|
|
|
1363 |
MAKE_type_ptr ( cv_none, p, p ) ;
|
|
|
1364 |
|
|
|
1365 |
/* Construct the result */
|
|
|
1366 |
a = make_ref_object ( a, &err2 ) ;
|
|
|
1367 |
s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
1368 |
if ( IS_type_error ( s ) ) {
|
|
|
1369 |
e = cast_exact ( p, a ) ;
|
|
|
1370 |
} else {
|
|
|
1371 |
e = cast_exp ( p, a, &err2, cast ) ;
|
|
|
1372 |
}
|
|
|
1373 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1374 |
add_error ( err, err2 ) ;
|
|
|
1375 |
add_error ( err, ERR_expr_cast_ref ( t, p ) ) ;
|
|
|
1376 |
}
|
|
|
1377 |
e = cast_exact ( t, e ) ;
|
|
|
1378 |
return ( e ) ;
|
|
|
1379 |
}
|
|
|
1380 |
|
|
|
1381 |
/* Check user-defined conversion status */
|
|
|
1382 |
if ( cast & CAST_STANDARD ) {
|
|
|
1383 |
cast &= ~CAST_STANDARD ;
|
|
|
1384 |
usr = 0 ;
|
|
|
1385 |
}
|
|
|
1386 |
|
|
|
1387 |
/* Deal with function overloading */
|
|
|
1388 |
a = resolve_cast ( t, a, err, 1, 0, NULL_list ( IDENTIFIER ) ) ;
|
|
|
1389 |
|
|
|
1390 |
/* Deal with casting to void */
|
|
|
1391 |
if ( nt == type_top_tag || nt == type_bottom_tag ) {
|
|
|
1392 |
if ( cast & CAST_STATIC ) {
|
|
|
1393 |
a = make_discard_exp ( a ) ;
|
|
|
1394 |
MAKE_exp_cast ( t, CONV_ELLIPSIS, a, e ) ;
|
|
|
1395 |
return ( e ) ;
|
|
|
1396 |
}
|
|
|
1397 |
}
|
|
|
1398 |
|
|
|
1399 |
/* Find the operand type */
|
|
|
1400 |
s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
1401 |
ns = TAG_type ( s ) ;
|
|
|
1402 |
|
|
|
1403 |
/* Check for template types */
|
|
|
1404 |
if ( ns == type_token_tag && is_templ_type ( s ) ) {
|
|
|
1405 |
e = cast_templ_type ( t, a, cast ) ;
|
|
|
1406 |
return ( e ) ;
|
|
|
1407 |
}
|
|
|
1408 |
|
|
|
1409 |
/* Deal with user-defined conversions */
|
|
|
1410 |
if ( usr ) {
|
|
|
1411 |
if ( nt == type_compound_tag ) {
|
|
|
1412 |
if ( cast == CAST_IMPLICIT || ( cast & CAST_STATIC ) ) {
|
|
|
1413 |
ERROR err2 = check_incomplete ( t ) ;
|
|
|
1414 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1415 |
/* Can't have incomplete type */
|
|
|
1416 |
add_error ( err, err2 ) ;
|
|
|
1417 |
add_error ( err, ERR_expr_cast_invalid ( s, t ) ) ;
|
|
|
1418 |
e = make_null_exp ( t ) ;
|
|
|
1419 |
return ( e ) ;
|
|
|
1420 |
}
|
|
|
1421 |
if ( cast != CAST_IMPLICIT ) {
|
|
|
1422 |
err2 = check_abstract ( t ) ;
|
|
|
1423 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1424 |
/* Can't have abstract type */
|
|
|
1425 |
add_error ( err, err2 ) ;
|
|
|
1426 |
add_error ( err, ERR_class_abstract_cast () ) ;
|
|
|
1427 |
}
|
|
|
1428 |
}
|
|
|
1429 |
e = init_direct ( t, a, err ) ;
|
|
|
1430 |
return ( e ) ;
|
|
|
1431 |
}
|
|
|
1432 |
}
|
|
|
1433 |
if ( ns == type_compound_tag ) {
|
|
|
1434 |
if ( cast == CAST_IMPLICIT || ( cast & CAST_STATIC ) ) {
|
|
|
1435 |
e = convert_conv ( t, a, err, cast ) ;
|
|
|
1436 |
return ( e ) ;
|
|
|
1437 |
}
|
|
|
1438 |
}
|
|
|
1439 |
}
|
|
|
1440 |
|
|
|
1441 |
/* Check for function casts */
|
|
|
1442 |
#if LANGUAGE_CPP
|
|
|
1443 |
if ( nt == type_func_tag && ns == type_func_tag ) {
|
|
|
1444 |
if ( cast & CAST_STATIC ) {
|
|
|
1445 |
if ( eq_type ( t, s ) ) {
|
|
|
1446 |
add_error ( err, ERR_expr_cast_stat_func ( t ) ) ;
|
|
|
1447 |
t = lvalue_type ( t ) ;
|
|
|
1448 |
MAKE_exp_cast ( t, CONV_FUNC, a, e ) ;
|
|
|
1449 |
return ( e ) ;
|
|
|
1450 |
}
|
|
|
1451 |
}
|
|
|
1452 |
}
|
|
|
1453 |
#endif
|
|
|
1454 |
|
|
|
1455 |
/* Do lvalue conversion on conversion */
|
|
|
1456 |
a = convert_lvalue ( a ) ;
|
|
|
1457 |
s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
1458 |
ns = TAG_type ( s ) ;
|
|
|
1459 |
|
|
|
1460 |
/* Deal with tokenised types */
|
|
|
1461 |
if ( ns == type_token_tag ) {
|
|
|
1462 |
s = expand_type ( s, 0 ) ;
|
|
|
1463 |
ns = TAG_type ( s ) ;
|
|
|
1464 |
}
|
|
|
1465 |
|
|
|
1466 |
/* Ignore any qualifiers for destination type */
|
|
|
1467 |
cv = DEREF_cv ( type_qual ( t ) ) ;
|
|
|
1468 |
if ( cv != cv_none ) {
|
|
|
1469 |
#if LANGUAGE_CPP
|
|
|
1470 |
if ( nt != type_compound_tag ) cv = cv_none ;
|
|
|
1471 |
t = qualify_type ( t, cv, 0 ) ;
|
|
|
1472 |
#else
|
|
|
1473 |
t = qualify_type ( t, cv_none, 0 ) ;
|
|
|
1474 |
#endif
|
|
|
1475 |
}
|
|
|
1476 |
|
|
|
1477 |
/* Deal with casting to bool */
|
|
|
1478 |
if ( nt == type_integer_tag && check_int_type ( t, btype_bool ) ) {
|
|
|
1479 |
if ( ns == type_compound_tag ) {
|
|
|
1480 |
/* User-defined conversions already handled */
|
|
|
1481 |
/* EMPTY */
|
|
|
1482 |
} else {
|
|
|
1483 |
if ( cast == CAST_IMPLICIT || ( cast & CAST_STATIC ) ) {
|
|
|
1484 |
e = convert_boolean ( a, exp_paren_tag, err ) ;
|
|
|
1485 |
return ( e ) ;
|
|
|
1486 |
}
|
|
|
1487 |
if ( cast == CAST_CONST && eq_type ( s, t ) ) return ( a ) ;
|
|
|
1488 |
ns = null_tag ;
|
|
|
1489 |
}
|
|
|
1490 |
}
|
|
|
1491 |
|
|
|
1492 |
/* Check simple conversions */
|
|
|
1493 |
switch ( ns ) {
|
|
|
1494 |
case type_integer_tag :
|
|
|
1495 |
case type_enumerate_tag :
|
|
|
1496 |
integer_label : {
|
|
|
1497 |
/* Conversion from integer */
|
|
|
1498 |
switch ( nt ) {
|
|
|
1499 |
case type_integer_tag :
|
|
|
1500 |
case type_bitfield_tag :
|
|
|
1501 |
case type_enumerate_tag : {
|
|
|
1502 |
e = cast_int_int ( t, a, err, cast, -1 ) ;
|
|
|
1503 |
break ;
|
|
|
1504 |
}
|
|
|
1505 |
case type_floating_tag : {
|
|
|
1506 |
e = cast_int_float ( t, a, err, cast ) ;
|
|
|
1507 |
break ;
|
|
|
1508 |
}
|
|
|
1509 |
case type_ptr_tag : {
|
|
|
1510 |
e = cast_int_ptr ( t, a, err, cast, 1 ) ;
|
|
|
1511 |
break ;
|
|
|
1512 |
}
|
|
|
1513 |
case type_ptr_mem_tag : {
|
|
|
1514 |
e = cast_int_ptr_mem ( t, a, err, cast, 1 ) ;
|
|
|
1515 |
break ;
|
|
|
1516 |
}
|
|
|
1517 |
}
|
|
|
1518 |
break ;
|
|
|
1519 |
}
|
|
|
1520 |
case type_bitfield_tag : {
|
|
|
1521 |
/* Conversion from bitfield */
|
|
|
1522 |
switch ( nt ) {
|
|
|
1523 |
case type_integer_tag :
|
|
|
1524 |
case type_bitfield_tag :
|
|
|
1525 |
case type_enumerate_tag : {
|
|
|
1526 |
e = cast_int_int ( t, a, err, cast, -1 ) ;
|
|
|
1527 |
break ;
|
|
|
1528 |
}
|
|
|
1529 |
default : {
|
|
|
1530 |
TYPE r = find_bitfield_type ( s ) ;
|
|
|
1531 |
a = cast_int_int ( r, a, err, cast, -1 ) ;
|
|
|
1532 |
goto integer_label ;
|
|
|
1533 |
}
|
|
|
1534 |
}
|
|
|
1535 |
break ;
|
|
|
1536 |
}
|
|
|
1537 |
case type_floating_tag : {
|
|
|
1538 |
/* Conversion from floating */
|
|
|
1539 |
switch ( nt ) {
|
|
|
1540 |
case type_integer_tag :
|
|
|
1541 |
case type_enumerate_tag : {
|
|
|
1542 |
e = cast_float_int ( t, a, err, cast ) ;
|
|
|
1543 |
break ;
|
|
|
1544 |
}
|
|
|
1545 |
case type_bitfield_tag : {
|
|
|
1546 |
TYPE r = find_bitfield_type ( t ) ;
|
|
|
1547 |
a = cast_float_int ( r, a, err, cast ) ;
|
|
|
1548 |
e = cast_int_int ( t, a, err, cast, -1 ) ;
|
|
|
1549 |
break ;
|
|
|
1550 |
}
|
|
|
1551 |
case type_floating_tag : {
|
|
|
1552 |
e = cast_float_float ( t, a, err, cast ) ;
|
|
|
1553 |
break ;
|
|
|
1554 |
}
|
|
|
1555 |
}
|
|
|
1556 |
break ;
|
|
|
1557 |
}
|
|
|
1558 |
case type_ptr_tag : {
|
|
|
1559 |
/* Conversion from pointer */
|
|
|
1560 |
switch ( nt ) {
|
|
|
1561 |
case type_integer_tag :
|
|
|
1562 |
case type_enumerate_tag : {
|
|
|
1563 |
e = cast_ptr_int ( t, a, err, cast ) ;
|
|
|
1564 |
break ;
|
|
|
1565 |
}
|
|
|
1566 |
case type_bitfield_tag : {
|
|
|
1567 |
TYPE r = find_bitfield_type ( t ) ;
|
|
|
1568 |
a = cast_ptr_int ( r, a, err, cast ) ;
|
|
|
1569 |
e = cast_int_int ( t, a, err, cast, -1 ) ;
|
|
|
1570 |
break ;
|
|
|
1571 |
}
|
|
|
1572 |
case type_ptr_tag : {
|
|
|
1573 |
e = cast_ptr_ptr ( t, a, err, cast, 0, 0 ) ;
|
|
|
1574 |
break ;
|
|
|
1575 |
}
|
|
|
1576 |
}
|
|
|
1577 |
break ;
|
|
|
1578 |
}
|
|
|
1579 |
case type_ptr_mem_tag : {
|
|
|
1580 |
/* Conversion from pointer to member */
|
|
|
1581 |
switch ( nt ) {
|
|
|
1582 |
case type_integer_tag :
|
|
|
1583 |
case type_enumerate_tag : {
|
|
|
1584 |
e = cast_ptr_mem_int ( t, a, err, cast ) ;
|
|
|
1585 |
break ;
|
|
|
1586 |
}
|
|
|
1587 |
case type_bitfield_tag : {
|
|
|
1588 |
TYPE r = find_bitfield_type ( t ) ;
|
|
|
1589 |
e = cast_ptr_mem_int ( r, a, err, cast ) ;
|
|
|
1590 |
a = cast_int_int ( t, a, err, cast, -1 ) ;
|
|
|
1591 |
break ;
|
|
|
1592 |
}
|
|
|
1593 |
case type_ptr_tag : {
|
|
|
1594 |
e = cast_ptr_mem_ptr ( t, a, err, cast ) ;
|
|
|
1595 |
break ;
|
|
|
1596 |
}
|
|
|
1597 |
case type_ptr_mem_tag : {
|
|
|
1598 |
e = cast_ptr_mem_ptr_mem ( t, a, err, cast, 0, 0 ) ;
|
|
|
1599 |
break ;
|
|
|
1600 |
}
|
|
|
1601 |
}
|
|
|
1602 |
break ;
|
|
|
1603 |
}
|
|
|
1604 |
case type_compound_tag : {
|
|
|
1605 |
if ( nt == type_compound_tag && !usr ) {
|
|
|
1606 |
e = cast_class_class ( t, a, err, cast, 0 ) ;
|
|
|
1607 |
}
|
|
|
1608 |
break ;
|
|
|
1609 |
}
|
|
|
1610 |
}
|
|
|
1611 |
|
|
|
1612 |
if ( IS_NULL_exp ( e ) ) {
|
|
|
1613 |
if ( cast != CAST_IMPLICIT ) {
|
|
|
1614 |
switch ( nt ) {
|
|
|
1615 |
case type_func_tag :
|
|
|
1616 |
case type_array_tag :
|
|
|
1617 |
case type_token_tag :
|
|
|
1618 |
case type_compound_tag : {
|
|
|
1619 |
/* Cast to non-scalar type */
|
|
|
1620 |
add_error ( err, ERR_expr_cast_expl_scalar ( t ) ) ;
|
|
|
1621 |
break ;
|
|
|
1622 |
}
|
|
|
1623 |
}
|
|
|
1624 |
}
|
|
|
1625 |
if ( ns == type_token_tag || nt == type_token_tag ) {
|
|
|
1626 |
/* Allow for tokenised types */
|
|
|
1627 |
int ft = force_tokdef ;
|
|
|
1628 |
int fs = force_template ;
|
|
|
1629 |
if ( cast != CAST_IMPLICIT ) {
|
|
|
1630 |
force_tokdef = 0 ;
|
|
|
1631 |
force_template = 0 ;
|
|
|
1632 |
}
|
|
|
1633 |
if ( eq_type_unqual ( s, t ) ) e = a ;
|
|
|
1634 |
force_template = fs ;
|
|
|
1635 |
force_tokdef = ft ;
|
|
|
1636 |
}
|
|
|
1637 |
if ( IS_NULL_exp ( e ) ) {
|
|
|
1638 |
/* No other conversions are allowed */
|
|
|
1639 |
if ( ns == type_error_tag || nt == type_error_tag ) {
|
|
|
1640 |
e = cast_exact ( t, a ) ;
|
|
|
1641 |
} else {
|
|
|
1642 |
ERROR err2 = check_incomplete ( t ) ;
|
|
|
1643 |
err2 = concat_error ( err2, ERR_expr_cast_invalid ( s, t ) ) ;
|
|
|
1644 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1645 |
e = cast_token ( t, a, err, err2, cast ) ;
|
|
|
1646 |
if ( !IS_NULL_exp ( e ) ) return ( e ) ;
|
|
|
1647 |
}
|
|
|
1648 |
MAKE_exp_cast ( t, CONV_NONE, a, e ) ;
|
|
|
1649 |
}
|
|
|
1650 |
}
|
|
|
1651 |
}
|
|
|
1652 |
return ( e ) ;
|
|
|
1653 |
}
|
|
|
1654 |
|
|
|
1655 |
|
|
|
1656 |
/*
|
|
|
1657 |
CONSTRUCT A SIMPLE CAST EXPRESSION
|
|
|
1658 |
|
|
|
1659 |
This routine constructs the simple cast expression '( t ) a'. n gives
|
|
|
1660 |
the number of types defined in t.
|
|
|
1661 |
*/
|
|
|
1662 |
|
|
|
1663 |
EXP make_cast_exp
|
|
|
1664 |
PROTO_N ( ( t, a, n ) )
|
|
|
1665 |
PROTO_T ( TYPE t X EXP a X int n )
|
|
|
1666 |
{
|
|
|
1667 |
EXP e ;
|
|
|
1668 |
ERROR err = NULL_err ;
|
|
|
1669 |
unsigned conv = ( unsigned ) option_value ( OPT_VAL_cast_explicit ) ;
|
|
|
1670 |
report ( crt_loc, ERR_expr_cast_expl_used () ) ;
|
|
|
1671 |
if ( n ) report ( crt_loc, ERR_expr_cast_expl_typedef () ) ;
|
|
|
1672 |
a = convert_reference ( a, REF_ASSIGN ) ;
|
|
|
1673 |
e = cast_exp ( t, a, &err, conv ) ;
|
|
|
1674 |
if ( !IS_NULL_err ( err ) ) {
|
|
|
1675 |
err = concat_warning ( err, ERR_expr_cast_expl_bad () ) ;
|
|
|
1676 |
report ( crt_loc, err ) ;
|
|
|
1677 |
}
|
|
|
1678 |
return ( e ) ;
|
|
|
1679 |
}
|
|
|
1680 |
|
|
|
1681 |
|
|
|
1682 |
/*
|
|
|
1683 |
CONSTRUCT A STATIC CAST EXPRESSION
|
|
|
1684 |
|
|
|
1685 |
This routine constructs the static cast expression 'static_cast < t >
|
|
|
1686 |
( a )'. n gives the number of types defined in t.
|
|
|
1687 |
*/
|
|
|
1688 |
|
|
|
1689 |
EXP make_static_cast_exp
|
|
|
1690 |
PROTO_N ( ( t, a, n ) )
|
|
|
1691 |
PROTO_T ( TYPE t X EXP a X int n )
|
|
|
1692 |
{
|
|
|
1693 |
EXP e ;
|
|
|
1694 |
ERROR err = NULL_err ;
|
|
|
1695 |
if ( n ) report ( crt_loc, ERR_expr_cast_stat_typedef () ) ;
|
|
|
1696 |
a = convert_reference ( a, REF_ASSIGN ) ;
|
|
|
1697 |
e = cast_exp ( t, a, &err, CAST_STATIC ) ;
|
|
|
1698 |
if ( !IS_NULL_err ( err ) ) {
|
|
|
1699 |
err = concat_warning ( err, ERR_expr_cast_stat_bad () ) ;
|
|
|
1700 |
report ( crt_loc, err ) ;
|
|
|
1701 |
}
|
|
|
1702 |
return ( e ) ;
|
|
|
1703 |
}
|
|
|
1704 |
|
|
|
1705 |
|
|
|
1706 |
/*
|
|
|
1707 |
CONSTRUCT A REINTERPRET CAST EXPRESSION
|
|
|
1708 |
|
|
|
1709 |
This routine constructs the reinterpret cast expression 'reinterpret_cast
|
|
|
1710 |
< t > ( a )'. n gives the number of types defined in t.
|
|
|
1711 |
*/
|
|
|
1712 |
|
|
|
1713 |
EXP make_reinterp_cast_exp
|
|
|
1714 |
PROTO_N ( ( t, a, n ) )
|
|
|
1715 |
PROTO_T ( TYPE t X EXP a X int n )
|
|
|
1716 |
{
|
|
|
1717 |
EXP e ;
|
|
|
1718 |
ERROR err = NULL_err ;
|
|
|
1719 |
if ( n ) report ( crt_loc, ERR_expr_cast_reint_typedef () ) ;
|
|
|
1720 |
a = convert_reference ( a, REF_ASSIGN ) ;
|
|
|
1721 |
e = cast_exp ( t, a, &err, CAST_REINTERP ) ;
|
|
|
1722 |
if ( !IS_NULL_err ( err ) ) {
|
|
|
1723 |
err = concat_warning ( err, ERR_expr_cast_reint_bad () ) ;
|
|
|
1724 |
report ( crt_loc, err ) ;
|
|
|
1725 |
}
|
|
|
1726 |
return ( e ) ;
|
|
|
1727 |
}
|
|
|
1728 |
|
|
|
1729 |
|
|
|
1730 |
/*
|
|
|
1731 |
CONSTRUCT A CONST CAST EXPRESSION
|
|
|
1732 |
|
|
|
1733 |
This routine constructs the const cast expression 'const_cast < t >
|
|
|
1734 |
( a )'. n gives the number of types defined in t.
|
|
|
1735 |
*/
|
|
|
1736 |
|
|
|
1737 |
EXP make_const_cast_exp
|
|
|
1738 |
PROTO_N ( ( t, a, n ) )
|
|
|
1739 |
PROTO_T ( TYPE t X EXP a X int n )
|
|
|
1740 |
{
|
|
|
1741 |
EXP e ;
|
|
|
1742 |
ERROR err = NULL_err ;
|
|
|
1743 |
if ( n ) report ( crt_loc, ERR_expr_cast_const_typedef () ) ;
|
|
|
1744 |
a = convert_reference ( a, REF_ASSIGN ) ;
|
|
|
1745 |
e = cast_exp ( t, a, &err, CAST_CONST ) ;
|
|
|
1746 |
if ( !IS_NULL_err ( err ) ) {
|
|
|
1747 |
err = concat_warning ( err, ERR_expr_cast_const_bad () ) ;
|
|
|
1748 |
report ( crt_loc, err ) ;
|
|
|
1749 |
}
|
|
|
1750 |
return ( e ) ;
|
|
|
1751 |
}
|
|
|
1752 |
|
|
|
1753 |
|
|
|
1754 |
/*
|
|
|
1755 |
CONSTRUCT A NEW-STYLE CAST EXPRESSION
|
|
|
1756 |
|
|
|
1757 |
This routine constructs the new-style cast expression 'op < t > ( a )'.
|
|
|
1758 |
n gives the number of types defined in t.
|
|
|
1759 |
*/
|
|
|
1760 |
|
|
|
1761 |
#if LANGUAGE_CPP
|
|
|
1762 |
|
|
|
1763 |
EXP make_new_cast_exp
|
|
|
1764 |
PROTO_N ( ( op, t, a, n ) )
|
|
|
1765 |
PROTO_T ( int op X TYPE t X EXP a X int n )
|
|
|
1766 |
{
|
|
|
1767 |
EXP e ;
|
|
|
1768 |
switch ( op ) {
|
|
|
1769 |
case lex_static_Hcast : {
|
|
|
1770 |
e = make_static_cast_exp ( t, a, n ) ;
|
|
|
1771 |
break ;
|
|
|
1772 |
}
|
|
|
1773 |
case lex_reinterpret_Hcast : {
|
|
|
1774 |
e = make_reinterp_cast_exp ( t, a, n ) ;
|
|
|
1775 |
break ;
|
|
|
1776 |
}
|
|
|
1777 |
case lex_const_Hcast : {
|
|
|
1778 |
e = make_const_cast_exp ( t, a, n ) ;
|
|
|
1779 |
break ;
|
|
|
1780 |
}
|
|
|
1781 |
case lex_dynamic_Hcast : {
|
|
|
1782 |
e = make_dynamic_cast_exp ( t, a, n ) ;
|
|
|
1783 |
break ;
|
|
|
1784 |
}
|
|
|
1785 |
default : {
|
|
|
1786 |
e = make_cast_exp ( t, a, n ) ;
|
|
|
1787 |
break ;
|
|
|
1788 |
}
|
|
|
1789 |
}
|
|
|
1790 |
return ( e ) ;
|
|
|
1791 |
}
|
|
|
1792 |
|
|
|
1793 |
#endif
|
|
|
1794 |
|
|
|
1795 |
|
|
|
1796 |
/*
|
|
|
1797 |
CONSTRUCT A FUNCTION-STYLE CAST EXPRESSION
|
|
|
1798 |
|
|
|
1799 |
This routine constructs the function-style cast expression 't ( args )'.
|
|
|
1800 |
If args is a single argument, a, then this is identical to '( t ) a'.
|
|
|
1801 |
The expression 't ()' can be formed for any type, otherwise t must be
|
|
|
1802 |
a class type with a suitable constructor.
|
|
|
1803 |
*/
|
|
|
1804 |
|
|
|
1805 |
EXP make_func_cast_exp
|
|
|
1806 |
PROTO_N ( ( t, args ) )
|
|
|
1807 |
PROTO_T ( TYPE t X LIST ( EXP ) args )
|
|
|
1808 |
{
|
|
|
1809 |
EXP e ;
|
|
|
1810 |
ERROR err = NULL_err ;
|
|
|
1811 |
unsigned tag = TAG_type ( t ) ;
|
|
|
1812 |
unsigned len = LENGTH_list ( args ) ;
|
|
|
1813 |
|
|
|
1814 |
/* Do reference conversions on arguments */
|
|
|
1815 |
args = convert_args ( args ) ;
|
|
|
1816 |
|
|
|
1817 |
/* Check for template types */
|
|
|
1818 |
if ( tag == type_token_tag && is_templ_type ( t ) ) {
|
|
|
1819 |
MAKE_exp_opn ( t, lex_cast, args, e ) ;
|
|
|
1820 |
return ( e ) ;
|
|
|
1821 |
}
|
|
|
1822 |
|
|
|
1823 |
/* Check for class type with more than one argument */
|
|
|
1824 |
if ( len > 1 && tag != type_compound_tag ) {
|
|
|
1825 |
report ( crt_loc, ERR_expr_type_conv_many ( t ) ) ;
|
|
|
1826 |
len = 1 ;
|
|
|
1827 |
}
|
|
|
1828 |
|
|
|
1829 |
if ( len == 1 ) {
|
|
|
1830 |
/* A single argument is the same as a normal cast */
|
|
|
1831 |
unsigned conv = ( unsigned ) option_value ( OPT_VAL_cast_explicit ) ;
|
|
|
1832 |
EXP a = DEREF_exp ( HEAD_list ( args ) ) ;
|
|
|
1833 |
DESTROY_list ( args, SIZE_exp ) ;
|
|
|
1834 |
if ( tag != type_compound_tag ) {
|
|
|
1835 |
report ( crt_loc, ERR_expr_cast_expl_used () ) ;
|
|
|
1836 |
}
|
|
|
1837 |
e = cast_exp ( t, a, &err, conv ) ;
|
|
|
1838 |
if ( !IS_NULL_err ( err ) ) {
|
|
|
1839 |
err = concat_warning ( err, ERR_expr_type_conv_bad () ) ;
|
|
|
1840 |
report ( crt_loc, err ) ;
|
|
|
1841 |
}
|
|
|
1842 |
return ( e ) ;
|
|
|
1843 |
}
|
|
|
1844 |
|
|
|
1845 |
if ( len == 0 ) {
|
|
|
1846 |
/* No arguments give a zero value */
|
|
|
1847 |
if ( IS_type_top_etc ( t ) ) {
|
|
|
1848 |
MAKE_exp_value ( t, e ) ;
|
|
|
1849 |
} else {
|
|
|
1850 |
err = check_complete ( t ) ;
|
|
|
1851 |
if ( !IS_NULL_err ( err ) ) {
|
|
|
1852 |
/* Can't cast to an incomplete type */
|
|
|
1853 |
err = concat_error ( err, ERR_expr_type_conv_incompl () ) ;
|
|
|
1854 |
report ( crt_loc, err ) ;
|
|
|
1855 |
}
|
|
|
1856 |
if ( IS_type_array ( t ) ) {
|
|
|
1857 |
/* Can't use an array type */
|
|
|
1858 |
report ( crt_loc, ERR_expr_type_conv_array ( t ) ) ;
|
|
|
1859 |
}
|
|
|
1860 |
err = check_abstract ( t ) ;
|
|
|
1861 |
if ( !IS_NULL_err ( err ) ) {
|
|
|
1862 |
/* Can't cast to an abstract type */
|
|
|
1863 |
err = concat_error ( err, ERR_class_abstract_cast () ) ;
|
|
|
1864 |
report ( crt_loc, err ) ;
|
|
|
1865 |
err = NULL_err ;
|
|
|
1866 |
}
|
|
|
1867 |
e = init_empty ( t, cv_none, 1, &err ) ;
|
|
|
1868 |
if ( !IS_NULL_err ( err ) ) report ( crt_loc, err ) ;
|
|
|
1869 |
}
|
|
|
1870 |
return ( e ) ;
|
|
|
1871 |
}
|
|
|
1872 |
|
|
|
1873 |
/* Now check constructor conversions */
|
|
|
1874 |
e = convert_constr ( t, args, &err, CAST_STATIC ) ;
|
|
|
1875 |
if ( !IS_NULL_err ( err ) ) report ( crt_loc, err ) ;
|
|
|
1876 |
return ( e ) ;
|
|
|
1877 |
}
|
|
|
1878 |
|
|
|
1879 |
|
|
|
1880 |
/*
|
|
|
1881 |
LIST OF ALL CONVERSION TOKENS
|
|
|
1882 |
|
|
|
1883 |
Whenever a type conversion would raise an error this list of tokens
|
|
|
1884 |
is consulted to see if one of them could perform the conversion.
|
|
|
1885 |
*/
|
|
|
1886 |
|
|
|
1887 |
static LIST ( IDENTIFIER ) conv_tokens = NULL_list ( IDENTIFIER ) ;
|
|
|
1888 |
|
|
|
1889 |
|
|
|
1890 |
/*
|
|
|
1891 |
ALLOW A TOKEN AS A CONVERSION
|
|
|
1892 |
|
|
|
1893 |
This routine enables the token id as a conversion token.
|
|
|
1894 |
*/
|
|
|
1895 |
|
|
|
1896 |
void allow_conversion
|
|
|
1897 |
PROTO_N ( ( id ) )
|
|
|
1898 |
PROTO_T ( IDENTIFIER id )
|
|
|
1899 |
{
|
|
|
1900 |
IDENTIFIER tid = resolve_token ( id, "EE", 1 ) ;
|
|
|
1901 |
if ( !IS_NULL_id ( tid ) ) {
|
|
|
1902 |
CONS_id ( tid, conv_tokens, conv_tokens ) ;
|
|
|
1903 |
}
|
|
|
1904 |
return ;
|
|
|
1905 |
}
|
|
|
1906 |
|
|
|
1907 |
|
|
|
1908 |
/*
|
|
|
1909 |
CHECK FOR TOKENISED CONVERSIONS
|
|
|
1910 |
|
|
|
1911 |
This routine checks whether the expression a can be converted to the
|
|
|
1912 |
type t using a conversion token. If so it returns the appropriate
|
|
|
1913 |
token application. Otherwise it returns the null expression.
|
|
|
1914 |
*/
|
|
|
1915 |
|
|
|
1916 |
EXP cast_token
|
|
|
1917 |
PROTO_N ( ( t, a, err, err2, cast ) )
|
|
|
1918 |
PROTO_T ( TYPE t X EXP a X ERROR *err X ERROR err2 X unsigned cast )
|
|
|
1919 |
{
|
|
|
1920 |
EXP e = NULL_exp ;
|
|
|
1921 |
int sev = ERROR_NONE ;
|
|
|
1922 |
if ( !IS_NULL_err ( err2 ) ) {
|
|
|
1923 |
sev = DEREF_int ( err_severity ( err2 ) ) ;
|
|
|
1924 |
}
|
|
|
1925 |
if ( sev == ERROR_SERIOUS ) {
|
|
|
1926 |
/* Only check illegal conversions */
|
|
|
1927 |
force_tokdef++ ;
|
|
|
1928 |
if ( cast == CAST_IMPLICIT || ( cast & CAST_STATIC ) ) {
|
|
|
1929 |
/* Scan through conversion tokens */
|
|
|
1930 |
TYPE s = DEREF_type ( exp_type ( a ) ) ;
|
|
|
1931 |
LIST ( IDENTIFIER ) convs = conv_tokens ;
|
|
|
1932 |
while ( !IS_NULL_list ( convs ) ) {
|
|
|
1933 |
IDENTIFIER id = DEREF_id ( HEAD_list ( convs ) ) ;
|
|
|
1934 |
TOKEN tok = DEREF_tok ( id_token_sort ( id ) ) ;
|
|
|
1935 |
if ( IS_tok_func ( tok ) ) {
|
|
|
1936 |
/* Function tokens */
|
|
|
1937 |
tok = func_proc_token ( tok ) ;
|
|
|
1938 |
}
|
|
|
1939 |
if ( IS_tok_proc ( tok ) ) {
|
|
|
1940 |
/* Procedure tokens */
|
|
|
1941 |
int d ;
|
|
|
1942 |
TYPE p ;
|
|
|
1943 |
TOKEN par ;
|
|
|
1944 |
IDENTIFIER pid ;
|
|
|
1945 |
LIST ( IDENTIFIER ) bids ;
|
|
|
1946 |
LIST ( IDENTIFIER ) pids ;
|
|
|
1947 |
|
|
|
1948 |
/* Find result type */
|
|
|
1949 |
TOKEN res = DEREF_tok ( tok_proc_res ( tok ) ) ;
|
|
|
1950 |
TYPE r = DEREF_type ( tok_exp_type ( res ) ) ;
|
|
|
1951 |
|
|
|
1952 |
/* Find parameter type */
|
|
|
1953 |
pids = DEREF_list ( tok_proc_pids ( tok ) ) ;
|
|
|
1954 |
pid = DEREF_id ( HEAD_list ( pids ) ) ;
|
|
|
1955 |
par = DEREF_tok ( id_token_sort ( pid ) ) ;
|
|
|
1956 |
p = DEREF_type ( tok_exp_type ( par ) ) ;
|
|
|
1957 |
|
|
|
1958 |
/* Check conversion */
|
|
|
1959 |
bids = DEREF_list ( tok_proc_bids ( tok ) ) ;
|
|
|
1960 |
d = save_token_args ( bids, NULL_list ( TOKEN ) ) ;
|
|
|
1961 |
if ( eq_type ( s, p ) && eq_type ( t, r ) ) {
|
|
|
1962 |
LIST ( TOKEN ) args ;
|
|
|
1963 |
ERROR err1 = ERR_token_conv ( id, s, t ) ;
|
|
|
1964 |
IGNORE define_exp_token ( pid, a, 1 ) ;
|
|
|
1965 |
args = make_token_args ( id, bids, &err1 ) ;
|
|
|
1966 |
e = apply_exp_token ( id, args, 0 ) ;
|
|
|
1967 |
if ( !IS_NULL_exp ( e ) ) {
|
|
|
1968 |
IDENTIFIER fid ;
|
|
|
1969 |
fid = DEREF_id ( id_token_alt ( id ) ) ;
|
|
|
1970 |
use_func_id ( fid, 0, 0 ) ;
|
|
|
1971 |
restore_token_args ( bids, d ) ;
|
|
|
1972 |
destroy_error ( err2, 1 ) ;
|
|
|
1973 |
err2 = err1 ;
|
|
|
1974 |
break ;
|
|
|
1975 |
}
|
|
|
1976 |
destroy_error ( err1, 1 ) ;
|
|
|
1977 |
}
|
|
|
1978 |
restore_token_args ( bids, d ) ;
|
|
|
1979 |
}
|
|
|
1980 |
convs = TAIL_list ( convs ) ;
|
|
|
1981 |
}
|
|
|
1982 |
}
|
|
|
1983 |
force_tokdef-- ;
|
|
|
1984 |
}
|
|
|
1985 |
add_error ( err, err2 ) ;
|
|
|
1986 |
return ( e ) ;
|
|
|
1987 |
}
|