925 lines
22 KiB
C
925 lines
22 KiB
C
/* Encoding of types for Objective C.
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Copyright (C) 1993, 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
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Contributed by Kresten Krab Thorup
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Bitfield support by Ovidiu Predescu
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/* As a special exception, if you link this library with files
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compiled with GCC to produce an executable, this does not cause
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the resulting executable to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#include "tconfig.h"
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#include "objc-api.h"
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#include "encoding.h"
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#undef MAX
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#define MAX(X, Y) \
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({ typeof(X) __x = (X), __y = (Y); \
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(__x > __y ? __x : __y); })
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#undef MIN
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#define MIN(X, Y) \
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({ typeof(X) __x = (X), __y = (Y); \
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(__x < __y ? __x : __y); })
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#undef ROUND
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#define ROUND(V, A) \
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({ typeof(V) __v=(V); typeof(A) __a=(A); \
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__a*((__v+__a-1)/__a); })
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/* Various hacks for objc_layout_record. These are used by the target
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macros. */
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#define TREE_CODE(TYPE) *(TYPE)
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#define TREE_TYPE(TREE) (TREE)
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#define RECORD_TYPE _C_STRUCT_B
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#define UNION_TYPE _C_UNION_B
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#define QUAL_UNION_TYPE _C_UNION_B
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#define ARRAY_TYPE _C_ARY_B
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#define REAL_TYPE _C_DBL
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#define VECTOR_TYPE _C_VECTOR
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#define TYPE_FIELDS(TYPE) objc_skip_typespec (TYPE)
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#define DECL_MODE(TYPE) *(TYPE)
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#define TYPE_MODE(TYPE) *(TYPE)
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#define DFmode _C_DBL
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#define get_inner_array_type(TYPE) ((TYPE) + 1)
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/* Some ports (eg ARM) allow the structure size boundary to be
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selected at compile-time. We override the normal definition with
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one that has a constant value for this compilation. */
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#undef STRUCTURE_SIZE_BOUNDARY
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#define STRUCTURE_SIZE_BOUNDARY (BITS_PER_UNIT * sizeof (struct{char a;}))
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/* Some ROUND_TYPE_ALIGN macros use TARGET_foo, and consequently
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target_flags. Define a dummy entry here to so we don't die. */
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static int target_flags = 0;
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static inline int
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atoi (const char* str)
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{
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int res = 0;
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while (isdigit (*str))
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res *= 10, res += (*str++ - '0');
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return res;
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}
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/*
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return the size of an object specified by type
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*/
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int
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objc_sizeof_type (const char* type)
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{
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/* Skip the variable name if any */
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if (*type == '"')
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{
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for (type++; *type++ != '"';)
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/* do nothing */;
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}
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switch(*type) {
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case _C_ID:
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return sizeof(id);
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break;
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case _C_CLASS:
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return sizeof(Class);
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break;
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case _C_SEL:
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return sizeof(SEL);
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break;
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case _C_CHR:
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return sizeof(char);
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break;
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case _C_UCHR:
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return sizeof(unsigned char);
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break;
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case _C_SHT:
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return sizeof(short);
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break;
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case _C_USHT:
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return sizeof(unsigned short);
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break;
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case _C_INT:
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return sizeof(int);
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break;
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case _C_UINT:
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return sizeof(unsigned int);
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break;
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case _C_LNG:
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return sizeof(long);
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break;
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case _C_ULNG:
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return sizeof(unsigned long);
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break;
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case _C_LNG_LNG:
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return sizeof(long long);
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break;
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case _C_ULNG_LNG:
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return sizeof(unsigned long long);
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break;
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case _C_FLT:
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return sizeof(float);
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break;
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case _C_DBL:
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return sizeof(double);
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break;
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case _C_VOID:
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return sizeof(void);
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break;
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case _C_PTR:
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case _C_ATOM:
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case _C_CHARPTR:
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return sizeof(char*);
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break;
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case _C_ARY_B:
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{
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int len = atoi(type+1);
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while (isdigit(*++type));
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return len*objc_aligned_size (type);
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}
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break;
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case _C_BFLD:
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{
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/* The new encoding of bitfields is: b 'position' 'type' 'size' */
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int position, size;
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int startByte, endByte;
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position = atoi (type + 1);
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while (isdigit (*++type));
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size = atoi (type + 1);
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startByte = position / BITS_PER_UNIT;
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endByte = (position + size) / BITS_PER_UNIT;
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return endByte - startByte;
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}
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case _C_STRUCT_B:
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{
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struct objc_struct_layout layout;
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unsigned int size;
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objc_layout_structure (type, &layout);
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while (objc_layout_structure_next_member (&layout))
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/* do nothing */ ;
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objc_layout_finish_structure (&layout, &size, NULL);
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return size;
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}
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case _C_UNION_B:
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{
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int max_size = 0;
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while (*type != _C_UNION_E && *type++ != '=') /* do nothing */;
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while (*type != _C_UNION_E)
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{
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/* Skip the variable name if any */
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if (*type == '"')
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{
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for (type++; *type++ != '"';)
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/* do nothing */;
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}
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max_size = MAX (max_size, objc_sizeof_type (type));
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type = objc_skip_typespec (type);
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}
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return max_size;
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}
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default:
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{
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objc_error(nil, OBJC_ERR_BAD_TYPE, "unknown type %s\n", type);
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return 0;
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}
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}
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}
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/*
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Return the alignment of an object specified by type
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*/
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int
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objc_alignof_type(const char* type)
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{
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/* Skip the variable name if any */
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if (*type == '"')
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{
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for (type++; *type++ != '"';)
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/* do nothing */;
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}
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switch(*type) {
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case _C_ID:
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return __alignof__(id);
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break;
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case _C_CLASS:
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return __alignof__(Class);
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break;
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case _C_SEL:
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return __alignof__(SEL);
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break;
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case _C_CHR:
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return __alignof__(char);
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break;
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case _C_UCHR:
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return __alignof__(unsigned char);
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break;
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case _C_SHT:
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return __alignof__(short);
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break;
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case _C_USHT:
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return __alignof__(unsigned short);
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break;
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case _C_INT:
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return __alignof__(int);
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break;
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case _C_UINT:
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return __alignof__(unsigned int);
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break;
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case _C_LNG:
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return __alignof__(long);
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break;
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case _C_ULNG:
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return __alignof__(unsigned long);
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break;
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case _C_LNG_LNG:
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return __alignof__(long long);
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break;
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case _C_ULNG_LNG:
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return __alignof__(unsigned long long);
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break;
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case _C_FLT:
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return __alignof__(float);
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break;
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case _C_DBL:
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return __alignof__(double);
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break;
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case _C_PTR:
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case _C_ATOM:
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case _C_CHARPTR:
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return __alignof__(char*);
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break;
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case _C_ARY_B:
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while (isdigit(*++type)) /* do nothing */;
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return objc_alignof_type (type);
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case _C_STRUCT_B:
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{
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struct objc_struct_layout layout;
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unsigned int align;
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objc_layout_structure (type, &layout);
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while (objc_layout_structure_next_member (&layout))
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/* do nothing */;
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objc_layout_finish_structure (&layout, NULL, &align);
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return align;
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}
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case _C_UNION_B:
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{
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int maxalign = 0;
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while (*type != _C_UNION_E && *type++ != '=') /* do nothing */;
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while (*type != _C_UNION_E)
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{
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/* Skip the variable name if any */
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if (*type == '"')
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{
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for (type++; *type++ != '"';)
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/* do nothing */;
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}
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maxalign = MAX (maxalign, objc_alignof_type (type));
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type = objc_skip_typespec (type);
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}
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return maxalign;
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}
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default:
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{
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objc_error(nil, OBJC_ERR_BAD_TYPE, "unknown type %s\n", type);
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return 0;
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}
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}
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}
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/*
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The aligned size if the size rounded up to the nearest alignment.
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*/
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int
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objc_aligned_size (const char* type)
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{
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int size, align;
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/* Skip the variable name */
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if (*type == '"')
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{
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for (type++; *type++ != '"';)
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/* do nothing */;
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}
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size = objc_sizeof_type (type);
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align = objc_alignof_type (type);
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return ROUND (size, align);
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}
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/*
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The size rounded up to the nearest integral of the wordsize, taken
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to be the size of a void*.
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*/
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int
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objc_promoted_size (const char* type)
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{
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int size, wordsize;
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/* Skip the variable name */
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if (*type == '"')
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{
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for (type++; *type++ != '"';)
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/* do nothing */;
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}
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size = objc_sizeof_type (type);
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wordsize = sizeof (void*);
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return ROUND (size, wordsize);
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}
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/*
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Skip type qualifiers. These may eventually precede typespecs
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occurring in method prototype encodings.
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*/
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inline const char*
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objc_skip_type_qualifiers (const char* type)
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{
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while (*type == _C_CONST
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|| *type == _C_IN
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|| *type == _C_INOUT
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|| *type == _C_OUT
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|| *type == _C_BYCOPY
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|| *type == _C_BYREF
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|| *type == _C_ONEWAY
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|| *type == _C_GCINVISIBLE)
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{
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type += 1;
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}
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return type;
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}
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/*
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Skip one typespec element. If the typespec is prepended by type
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qualifiers, these are skipped as well.
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*/
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const char*
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objc_skip_typespec (const char* type)
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{
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/* Skip the variable name if any */
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if (*type == '"')
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{
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for (type++; *type++ != '"';)
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/* do nothing */;
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}
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type = objc_skip_type_qualifiers (type);
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switch (*type) {
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case _C_ID:
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/* An id may be annotated by the actual type if it is known
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with the @"ClassName" syntax */
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if (*++type != '"')
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return type;
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else
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{
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while (*++type != '"') /* do nothing */;
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return type + 1;
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}
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/* The following are one character type codes */
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case _C_CLASS:
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case _C_SEL:
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case _C_CHR:
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case _C_UCHR:
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case _C_CHARPTR:
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case _C_ATOM:
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case _C_SHT:
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case _C_USHT:
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case _C_INT:
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case _C_UINT:
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case _C_LNG:
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case _C_ULNG:
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case _C_LNG_LNG:
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case _C_ULNG_LNG:
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case _C_FLT:
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case _C_DBL:
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case _C_VOID:
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case _C_UNDEF:
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return ++type;
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break;
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case _C_ARY_B:
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/* skip digits, typespec and closing ']' */
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while(isdigit(*++type));
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type = objc_skip_typespec(type);
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if (*type == _C_ARY_E)
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return ++type;
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else
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{
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objc_error(nil, OBJC_ERR_BAD_TYPE, "bad array type %s\n", type);
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return 0;
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}
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case _C_BFLD:
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/* The new encoding of bitfields is: b 'position' 'type' 'size' */
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while (isdigit (*++type)); /* skip position */
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while (isdigit (*++type)); /* skip type and size */
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return type;
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case _C_STRUCT_B:
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/* skip name, and elements until closing '}' */
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while (*type != _C_STRUCT_E && *type++ != '=');
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while (*type != _C_STRUCT_E) { type = objc_skip_typespec (type); }
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return ++type;
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case _C_UNION_B:
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/* skip name, and elements until closing ')' */
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while (*type != _C_UNION_E && *type++ != '=');
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while (*type != _C_UNION_E) { type = objc_skip_typespec (type); }
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return ++type;
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case _C_PTR:
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/* Just skip the following typespec */
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return objc_skip_typespec (++type);
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default:
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{
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objc_error(nil, OBJC_ERR_BAD_TYPE, "unknown type %s\n", type);
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return 0;
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}
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}
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}
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/*
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Skip an offset as part of a method encoding. This is prepended by a
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'+' if the argument is passed in registers.
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*/
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inline const char*
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objc_skip_offset (const char* type)
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{
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if (*type == '+') type++;
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while(isdigit(*++type));
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return type;
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}
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/*
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Skip an argument specification of a method encoding.
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*/
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const char*
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objc_skip_argspec (const char* type)
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{
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type = objc_skip_typespec (type);
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type = objc_skip_offset (type);
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return type;
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}
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/*
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Return the number of arguments that the method MTH expects.
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Note that all methods need two implicit arguments `self' and
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`_cmd'.
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*/
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int
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method_get_number_of_arguments (struct objc_method* mth)
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{
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int i = 0;
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const char* type = mth->method_types;
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while (*type)
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{
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type = objc_skip_argspec (type);
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i += 1;
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}
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return i - 1;
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}
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/*
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Return the size of the argument block needed on the stack to invoke
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the method MTH. This may be zero, if all arguments are passed in
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registers.
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*/
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int
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method_get_sizeof_arguments (struct objc_method* mth)
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{
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const char* type = objc_skip_typespec (mth->method_types);
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return atoi (type);
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}
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/*
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Return a pointer to the next argument of ARGFRAME. type points to
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the last argument. Typical use of this look like:
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{
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char *datum, *type;
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for (datum = method_get_first_argument (method, argframe, &type);
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datum; datum = method_get_next_argument (argframe, &type))
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{
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unsigned flags = objc_get_type_qualifiers (type);
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type = objc_skip_type_qualifiers (type);
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if (*type != _C_PTR)
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[portal encodeData: datum ofType: type];
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else
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{
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if ((flags & _F_IN) == _F_IN)
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[portal encodeData: *(char**)datum ofType: ++type];
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}
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}
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}
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*/
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char*
|
|
method_get_next_argument (arglist_t argframe,
|
|
const char **type)
|
|
{
|
|
const char *t = objc_skip_argspec (*type);
|
|
|
|
if (*t == '\0')
|
|
return 0;
|
|
|
|
*type = t;
|
|
t = objc_skip_typespec (t);
|
|
|
|
if (*t == '+')
|
|
return argframe->arg_regs + atoi (++t);
|
|
else
|
|
return argframe->arg_ptr + atoi (t);
|
|
}
|
|
|
|
/*
|
|
Return a pointer to the value of the first argument of the method
|
|
described in M with the given argumentframe ARGFRAME. The type
|
|
is returned in TYPE. type must be passed to successive calls of
|
|
method_get_next_argument.
|
|
*/
|
|
char*
|
|
method_get_first_argument (struct objc_method* m,
|
|
arglist_t argframe,
|
|
const char** type)
|
|
{
|
|
*type = m->method_types;
|
|
return method_get_next_argument (argframe, type);
|
|
}
|
|
|
|
/*
|
|
Return a pointer to the ARGth argument of the method
|
|
M from the frame ARGFRAME. The type of the argument
|
|
is returned in the value-result argument TYPE
|
|
*/
|
|
|
|
char*
|
|
method_get_nth_argument (struct objc_method* m,
|
|
arglist_t argframe, int arg,
|
|
const char **type)
|
|
{
|
|
const char* t = objc_skip_argspec (m->method_types);
|
|
|
|
if (arg > method_get_number_of_arguments (m))
|
|
return 0;
|
|
|
|
while (arg--)
|
|
t = objc_skip_argspec (t);
|
|
|
|
*type = t;
|
|
t = objc_skip_typespec (t);
|
|
|
|
if (*t == '+')
|
|
return argframe->arg_regs + atoi (++t);
|
|
else
|
|
return argframe->arg_ptr + atoi (t);
|
|
}
|
|
|
|
unsigned
|
|
objc_get_type_qualifiers (const char* type)
|
|
{
|
|
unsigned res = 0;
|
|
BOOL flag = YES;
|
|
|
|
while (flag)
|
|
switch (*type++)
|
|
{
|
|
case _C_CONST: res |= _F_CONST; break;
|
|
case _C_IN: res |= _F_IN; break;
|
|
case _C_INOUT: res |= _F_INOUT; break;
|
|
case _C_OUT: res |= _F_OUT; break;
|
|
case _C_BYCOPY: res |= _F_BYCOPY; break;
|
|
case _C_BYREF: res |= _F_BYREF; break;
|
|
case _C_ONEWAY: res |= _F_ONEWAY; break;
|
|
case _C_GCINVISIBLE: res |= _F_GCINVISIBLE; break;
|
|
default: flag = NO;
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
|
|
/* The following three functions can be used to determine how a
|
|
structure is laid out by the compiler. For example:
|
|
|
|
struct objc_struct_layout layout;
|
|
int i;
|
|
|
|
objc_layout_structure (type, &layout);
|
|
while (objc_layout_structure_next_member (&layout))
|
|
{
|
|
int position, align;
|
|
const char *type;
|
|
|
|
objc_layout_structure_get_info (&layout, &position, &align, &type);
|
|
printf ("element %d has offset %d, alignment %d\n",
|
|
i++, position, align);
|
|
}
|
|
|
|
These functions are used by objc_sizeof_type and objc_alignof_type
|
|
functions to compute the size and alignment of structures. The
|
|
previous method of computing the size and alignment of a structure
|
|
was not working on some architectures, particulary on AIX, and in
|
|
the presence of bitfields inside the structure. */
|
|
void
|
|
objc_layout_structure (const char *type,
|
|
struct objc_struct_layout *layout)
|
|
{
|
|
const char *ntype;
|
|
|
|
if (*type++ != _C_STRUCT_B)
|
|
{
|
|
objc_error(nil, OBJC_ERR_BAD_TYPE,
|
|
"record type expected in objc_layout_structure, got %s\n",
|
|
type);
|
|
}
|
|
|
|
layout->original_type = type;
|
|
|
|
/* Skip "<name>=" if any. Avoid embedded structures and unions. */
|
|
ntype = type;
|
|
while (*ntype != _C_STRUCT_E && *ntype != _C_STRUCT_B && *ntype != _C_UNION_B
|
|
&& *ntype++ != '=')
|
|
/* do nothing */;
|
|
|
|
/* If there's a "<name>=", ntype - 1 points to '='; skip the the name */
|
|
if (*(ntype - 1) == '=')
|
|
type = ntype;
|
|
|
|
layout->type = type;
|
|
layout->prev_type = NULL;
|
|
layout->record_size = 0;
|
|
layout->record_align = BITS_PER_UNIT;
|
|
|
|
layout->record_align = MAX (layout->record_align, STRUCTURE_SIZE_BOUNDARY);
|
|
}
|
|
|
|
|
|
BOOL
|
|
objc_layout_structure_next_member (struct objc_struct_layout *layout)
|
|
{
|
|
register int known_align = layout->record_size;
|
|
register int desired_align = 0;
|
|
|
|
/* The following are used only if the field is a bitfield */
|
|
register const char *bfld_type;
|
|
register int bfld_type_size, bfld_type_align, bfld_field_size;
|
|
|
|
/* The current type without the type qualifiers */
|
|
const char *type;
|
|
|
|
/* Add the size of the previous field to the size of the record. */
|
|
if (layout->prev_type)
|
|
{
|
|
type = objc_skip_type_qualifiers (layout->prev_type);
|
|
|
|
if (*type != _C_BFLD)
|
|
layout->record_size += objc_sizeof_type (type) * BITS_PER_UNIT;
|
|
else {
|
|
/* Get the bitfield's type */
|
|
for (bfld_type = type + 1;
|
|
isdigit(*bfld_type);
|
|
bfld_type++)
|
|
/* do nothing */;
|
|
|
|
bfld_type_size = objc_sizeof_type (bfld_type) * BITS_PER_UNIT;
|
|
bfld_type_align = objc_alignof_type (bfld_type) * BITS_PER_UNIT;
|
|
bfld_field_size = atoi (objc_skip_typespec (bfld_type));
|
|
layout->record_size += bfld_field_size;
|
|
}
|
|
}
|
|
|
|
if (*layout->type == _C_STRUCT_E)
|
|
return NO;
|
|
|
|
/* Skip the variable name if any */
|
|
if (*layout->type == '"')
|
|
{
|
|
for (layout->type++; *layout->type++ != '"';)
|
|
/* do nothing */;
|
|
}
|
|
|
|
type = objc_skip_type_qualifiers (layout->type);
|
|
|
|
if (*type != _C_BFLD)
|
|
desired_align = objc_alignof_type(type) * BITS_PER_UNIT;
|
|
else
|
|
{
|
|
desired_align = 1;
|
|
/* Skip the bitfield's offset */
|
|
for (bfld_type = type + 1; isdigit(*bfld_type); bfld_type++)
|
|
/* do nothing */;
|
|
|
|
bfld_type_size = objc_sizeof_type (bfld_type) * BITS_PER_UNIT;
|
|
bfld_type_align = objc_alignof_type (bfld_type) * BITS_PER_UNIT;
|
|
bfld_field_size = atoi (objc_skip_typespec (bfld_type));
|
|
}
|
|
|
|
#ifdef BIGGEST_FIELD_ALIGNMENT
|
|
desired_align = MIN (desired_align, BIGGEST_FIELD_ALIGNMENT);
|
|
#endif
|
|
#ifdef ADJUST_FIELD_ALIGN
|
|
desired_align = ADJUST_FIELD_ALIGN (type, desired_align);
|
|
#endif
|
|
|
|
/* Record must have at least as much alignment as any field.
|
|
Otherwise, the alignment of the field within the record
|
|
is meaningless. */
|
|
#ifndef PCC_BITFIELD_TYPE_MATTERS
|
|
layout->record_align = MAX (layout->record_align, desired_align);
|
|
#else
|
|
if (*type == _C_BFLD)
|
|
{
|
|
/* For these machines, a zero-length field does not
|
|
affect the alignment of the structure as a whole.
|
|
It does, however, affect the alignment of the next field
|
|
within the structure. */
|
|
if (bfld_field_size)
|
|
layout->record_align = MAX (layout->record_align, desired_align);
|
|
else
|
|
desired_align = objc_alignof_type (bfld_type) * BITS_PER_UNIT;
|
|
|
|
/* A named bit field of declared type `int'
|
|
forces the entire structure to have `int' alignment.
|
|
Q1: How is encoded this thing and how to check for it?
|
|
Q2: How to determine maximum_field_alignment at runtime? */
|
|
|
|
/* if (DECL_NAME (field) != 0) */
|
|
{
|
|
int type_align = bfld_type_align;
|
|
#if 0
|
|
if (maximum_field_alignment != 0)
|
|
type_align = MIN (type_align, maximum_field_alignment);
|
|
else if (DECL_PACKED (field))
|
|
type_align = MIN (type_align, BITS_PER_UNIT);
|
|
#endif
|
|
|
|
layout->record_align = MAX (layout->record_align, type_align);
|
|
}
|
|
}
|
|
else
|
|
layout->record_align = MAX (layout->record_align, desired_align);
|
|
#endif
|
|
|
|
/* Does this field automatically have alignment it needs
|
|
by virtue of the fields that precede it and the record's
|
|
own alignment? */
|
|
|
|
if (*type == _C_BFLD)
|
|
layout->record_size = atoi (type + 1);
|
|
else if (layout->record_size % desired_align != 0)
|
|
{
|
|
/* No, we need to skip space before this field.
|
|
Bump the cumulative size to multiple of field alignment. */
|
|
layout->record_size = ROUND (layout->record_size, desired_align);
|
|
}
|
|
|
|
/* Jump to the next field in record. */
|
|
|
|
layout->prev_type = layout->type;
|
|
layout->type = objc_skip_typespec (layout->type); /* skip component */
|
|
|
|
return YES;
|
|
}
|
|
|
|
|
|
void objc_layout_finish_structure (struct objc_struct_layout *layout,
|
|
unsigned int *size,
|
|
unsigned int *align)
|
|
{
|
|
if (layout->type && *layout->type == _C_STRUCT_E)
|
|
{
|
|
/* Work out the alignment of the record as one expression and store
|
|
in the record type. Round it up to a multiple of the record's
|
|
alignment. */
|
|
|
|
#if defined(ROUND_TYPE_ALIGN) && !defined(__sparc__)
|
|
layout->record_align = ROUND_TYPE_ALIGN (layout->original_type,
|
|
1,
|
|
layout->record_align);
|
|
#else
|
|
layout->record_align = MAX (1, layout->record_align);
|
|
#endif
|
|
|
|
#ifdef ROUND_TYPE_SIZE
|
|
layout->record_size = ROUND_TYPE_SIZE (layout->original_type,
|
|
layout->record_size,
|
|
layout->record_align);
|
|
#else
|
|
/* Round the size up to be a multiple of the required alignment */
|
|
layout->record_size = ROUND (layout->record_size, layout->record_align);
|
|
#endif
|
|
|
|
layout->type = NULL;
|
|
}
|
|
if (size)
|
|
*size = layout->record_size / BITS_PER_UNIT;
|
|
if (align)
|
|
*align = layout->record_align / BITS_PER_UNIT;
|
|
}
|
|
|
|
|
|
void objc_layout_structure_get_info (struct objc_struct_layout *layout,
|
|
unsigned int *offset,
|
|
unsigned int *align,
|
|
const char **type)
|
|
{
|
|
if (offset)
|
|
*offset = layout->record_size / BITS_PER_UNIT;
|
|
if (align)
|
|
*align = layout->record_align / BITS_PER_UNIT;
|
|
if (type)
|
|
*type = layout->prev_type;
|
|
}
|