555 lines
11 KiB
C
555 lines
11 KiB
C
/* Encoding of types for Objective C.
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Copyright (C) 1993, 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
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Contributed by Kresten Krab Thorup
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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 "encoding.h"
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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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#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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#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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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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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_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_STRUCT_B:
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{
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int acc_size = 0;
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int align;
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while (*type != _C_STRUCT_E && *type++ != '='); /* skip "<name>=" */
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while (*type != _C_STRUCT_E)
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{
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align = objc_alignof_type (type); /* padd to alignment */
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acc_size = ROUND (acc_size, align);
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acc_size += objc_sizeof_type (type); /* add component size */
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type = objc_skip_typespec (type); /* skip component */
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}
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return acc_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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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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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_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 { int x; double y; } fooalign;
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while(*type != _C_STRUCT_E && *type++ != '=') /* do nothing */;
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if (*type != _C_STRUCT_E)
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return MAX (objc_alignof_type (type), __alignof__ (fooalign));
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else
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return __alignof__ (fooalign);
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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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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 = objc_sizeof_type (type);
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int 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 = objc_sizeof_type (type);
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int 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_ONEWAY)
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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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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_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_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*
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method_get_next_argument (arglist_t argframe,
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const char **type)
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{
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const char *t = objc_skip_argspec (*type);
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if (*t == '\0')
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return 0;
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*type = t;
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t = objc_skip_typespec (t);
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if (*t == '+')
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return argframe->arg_regs + atoi (++t);
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else
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return argframe->arg_ptr + atoi (t);
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}
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/*
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Return a pointer to the value of the first argument of the method
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described in M with the given argumentframe ARGFRAME. The type
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is returned in TYPE. type must be passed to successive calls of
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method_get_next_argument.
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*/
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char*
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method_get_first_argument (struct objc_method* m,
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arglist_t argframe,
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const char** type)
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{
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*type = m->method_types;
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return method_get_next_argument (argframe, type);
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}
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/*
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Return a pointer to the ARGth argument of the method
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M from the frame ARGFRAME. The type of the argument
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is returned in the value-result argument TYPE
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*/
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char*
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method_get_nth_argument (struct objc_method* m,
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arglist_t argframe, int arg,
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const char **type)
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{
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const char* t = objc_skip_argspec (m->method_types);
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if (arg > method_get_number_of_arguments (m))
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return 0;
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while (arg--)
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t = objc_skip_argspec (t);
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*type = t;
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t = objc_skip_typespec (t);
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if (*t == '+')
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return argframe->arg_regs + atoi (++t);
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else
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return argframe->arg_ptr + atoi (t);
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}
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unsigned
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objc_get_type_qualifiers (const char* type)
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{
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unsigned res = 0;
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BOOL flag = YES;
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while (flag)
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switch (*type++)
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{
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case _C_CONST: res |= _F_CONST; break;
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case _C_IN: res |= _F_IN; break;
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case _C_INOUT: res |= _F_INOUT; break;
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case _C_OUT: res |= _F_OUT; break;
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case _C_BYCOPY: res |= _F_BYCOPY; break;
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case _C_ONEWAY: res |= _F_ONEWAY; break;
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default: flag = NO;
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}
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return res;
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}
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