165 lines
3.5 KiB
C
165 lines
3.5 KiB
C
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/********************************************
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code.c
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copyright 1991, Michael D. Brennan
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This is a source file for mawk, an implementation of
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the AWK programming language.
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Mawk is distributed without warranty under the terms of
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the GNU General Public License, version 2, 1991.
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********************************************/
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/* $Log: code.c,v $
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/* Revision 1.1.1.1 1993/03/21 09:45:37 cgd
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/* initial import of 386bsd-0.1 sources
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/*
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* Revision 5.1 91/12/05 07:55:43 brennan
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* 1.1 pre-release
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*
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*/
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/* code.c */
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#include "mawk.h"
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#include "code.h"
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#include "init.h"
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#include "jmp.h"
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#include "field.h"
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#define MAIN_CODE_SZ (MAIN_PAGE_SZ*sizeof(INST))
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INST *code_ptr ;
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INST *main_start , *main_code_ptr ;
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#if 0
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INST *begin_start , *begin_code_ptr ;
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INST *end_start , *end_code_ptr ;
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#endif
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unsigned main_size /*, begin_size, end_size*/ ;
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/* when the code is done executing its freed,
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that's why this is global */
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struct be_code begin_code , end_code ;
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void PROTO(fdump, (void) ) ;
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void be_expand( p )
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struct be_code *p ;
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{ int delta ;
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main_code_ptr = code_ptr ;
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if ( p->start )
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{
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delta = p->ptr - p->start ;
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p->start = (INST*) zrealloc(p->start, INST_BYTES(p->size),
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INST_BYTES(PAGE_SZ)) ;
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}
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else
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{
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delta = 0 ;
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p->start = (INST*) zmalloc(INST_BYTES(PAGE_SZ)) ;
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}
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p->size = PAGE_SZ ;
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code_ptr = p->start + delta ;
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}
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void be_shrink(p)
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struct be_code *p ;
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{
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int delta = code_ptr - p->start ;
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code_ptr = main_code_ptr ;
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if ( delta > p->size )
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overflow( p == & begin_code ?
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"BEGIN code" : "END code" , p->size) ;
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p->start = (INST*) zrealloc(p->start, INST_BYTES(p->size) ,
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INST_BYTES(delta+2)) ;
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p->ptr = p->start + delta ;
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p->size = delta + 2 ;
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}
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void code_init()
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{
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code_ptr = main_code_ptr = main_start
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= (INST *) zmalloc(MAIN_CODE_SZ) ;
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code1(_OMAIN) ;
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}
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void code_cleanup()
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{ int some_code_flag = 0 ; /* might only have functions */
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/* set the END code */
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if ( end_code.start )
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{
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end_code.ptr++ -> op = _EXIT0 ;
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end_code.ptr++ -> op = _HALT ;
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end_code.size = INST_BYTES(end_code.size) ;
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}
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/* set the main code */
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if ( end_code.start || code_ptr - main_start > 1 )
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{ int gl_offset = code_ptr - main_start ;
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extern INST *next_label ;
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extern int NR_flag ;
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if ( NR_flag ) code1(OL_GL_NR) ;
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else code1(OL_GL) ;
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code1(_HALT) ;
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main_size = code_ptr - main_start ;
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if ( main_size > MAIN_PAGE_SZ )
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overflow("MAIN code" , MAIN_PAGE_SZ) ;
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main_size *= sizeof(INST) ;
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code_ptr = main_start =
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(INST*) zrealloc(main_start, MAIN_CODE_SZ, main_size) ;
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next_label = main_start+gl_offset ;
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some_code_flag = 1 ;
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}
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else /* only BEGIN */
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{
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zfree(main_start, MAIN_CODE_SZ) ;
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main_start = (INST*) 0 ;
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}
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/* set the BEGIN code */
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if ( begin_code.start )
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{
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some_code_flag = 1 ;
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begin_code.ptr++ -> op = main_start ? _JMAIN : _EXIT0 ;
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begin_code.ptr++ -> op = _HALT ;
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begin_code.size = INST_BYTES(begin_code.size) ;
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/* execution starts at code_ptr */
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code_ptr = begin_code.start ;
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}
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#if ! SM_DOS
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if ( dump_code )
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{
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fdump() ; /* dumps all user functions */
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if ( begin_code.start )
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{ fprintf(stderr, "BEGIN\n") ; da(begin_code.start, stderr) ; }
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if ( end_code.start )
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{ fprintf(stderr, "END\n") ; da(end_code.start, stderr) ; }
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if ( main_start )
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{ fprintf(stderr, "MAIN\n") ; da(main_start, stderr) ; }
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}
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#endif
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if ( some_code_flag == 0 ) mawk_exit(0) ;
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}
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