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/********************************************
code.c
copyright 1991-93, Michael D. Brennan
This is a source file for mawk, an implementation of
the AWK programming language.
Mawk is distributed without warranty under the terms of
the GNU General Public License, version 2, 1991.
********************************************/
/* $Log: code.c,v $
* Revision 1.6 1995/06/18 19:42:13 mike
* Remove some redundant declarations and add some prototypes
*
* Revision 1.5 1995/06/09 23:21:36 mike
* make sure there is an execution block in case user defines function,
* but no pattern-action pairs
*
* Revision 1.4 1995/03/08 00:06:22 mike
* add a pointer cast
*
* Revision 1.3 1994/10/08 19:15:29 mike
* remove SM_DOS
*
* Revision 1.2 1993/07/07 00:07:38 mike
* more work on 1.2
*
* Revision 1.1.1.1 1993/07/03 18:58:10 mike
* move source to cvs
*
* Revision 5.4 1993/01/14 13:11:11 mike
* code2() -> xcode2()
*
* Revision 5.3 1993/01/09 20:15:35 mike
* code_pop checks if the resolve_list needs relocation
*
* Revision 5.2 1993/01/07 02:50:33 mike
* relative vs absolute code
*
* Revision 5.1 1991/12/05 07:55:43 brennan
* 1.1 pre-release
*
*/
/* code.c */
#include "mawk.h"
#include "code.h"
#include "init.h"
#include "jmp.h"
#include "field.h"
static CODEBLOCK *PROTO(new_code, (void)) ;
CODEBLOCK active_code ;
CODEBLOCK *main_code_p, *begin_code_p, *end_code_p ;
INST *begin_start, *main_start, *end_start ;
unsigned begin_size, main_size ;
INST *execution_start = 0 ;
/* grow the active code */
void
code_grow()
{
unsigned oldsize = code_limit - code_base ;
unsigned newsize = PAGESZ + oldsize ;
unsigned delta = code_ptr - code_base ;
if (code_ptr > code_limit) bozo("CODEWARN is too small") ;
code_base = (INST *)
zrealloc(code_base, INST_BYTES(oldsize),
INST_BYTES(newsize)) ;
code_limit = code_base + newsize ;
code_warn = code_limit - CODEWARN ;
code_ptr = code_base + delta ;
}
/* shrinks executable code that's done to its final size */
INST *
code_shrink(p, sizep)
CODEBLOCK *p ;
unsigned *sizep ;
{
unsigned oldsize = INST_BYTES(p->limit - p->base) ;
unsigned newsize = INST_BYTES(p->ptr - p->base) ;
INST *retval ;
*sizep = newsize ;
retval = (INST *) zrealloc(p->base, oldsize, newsize) ;
ZFREE(p) ;
return retval ;
}
/* code an op and a pointer in the active_code */
void
xcode2(op, ptr)
int op ;
PTR ptr ;
{
register INST *p = code_ptr + 2 ;
if (p >= code_warn)
{
code_grow() ;
p = code_ptr + 2 ;
}
p[-2].op = op ;
p[-1].ptr = ptr ;
code_ptr = p ;
}
/* code two ops in the active_code */
void
code2op(x, y)
int x, y ;
{
register INST *p = code_ptr + 2 ;
if (p >= code_warn)
{
code_grow() ;
p = code_ptr + 2 ;
}
p[-2].op = x ;
p[-1].op = y ;
code_ptr = p ;
}
void
code_init()
{
main_code_p = new_code() ;
active_code = *main_code_p ;
code1(_OMAIN) ;
}
/* final code relocation
set_code() as in set concrete */
void
set_code()
{
/* set the main code which is active_code */
if (end_code_p || code_offset > 1)
{
int gl_offset = code_offset ;
extern int NR_flag ;
if (NR_flag) code2op(OL_GL_NR, _HALT) ;
else code2op(OL_GL, _HALT) ;
*main_code_p = active_code ;
main_start = code_shrink(main_code_p, &main_size) ;
next_label = main_start + gl_offset ;
execution_start = main_start ;
}
else /* only BEGIN */
{
zfree(code_base, INST_BYTES(PAGESZ)) ;
ZFREE(main_code_p) ;
}
/* set the END code */
if (end_code_p)
{
unsigned dummy ;
active_code = *end_code_p ;
code2op(_EXIT0, _HALT) ;
*end_code_p = active_code ;
end_start = code_shrink(end_code_p, &dummy) ;
}
/* set the BEGIN code */
if (begin_code_p)
{
active_code = *begin_code_p ;
if (main_start) code2op(_JMAIN, _HALT) ;
else code2op(_EXIT0, _HALT) ;
*begin_code_p = active_code ;
begin_start = code_shrink(begin_code_p, &begin_size) ;
execution_start = begin_start ;
}
if ( ! execution_start )
{
/* program had functions but no pattern-action bodies */
execution_start = begin_start = (INST*) zmalloc(2*sizeof(INST)) ;
execution_start[0].op = _EXIT0 ;
execution_start[1].op = _HALT ;
}
}
void
dump_code()
{
fdump() ; /* dumps all user functions */
if (begin_start)
{ fprintf(stdout, "BEGIN\n") ;
da(begin_start, stdout) ; }
if (end_start)
{ fprintf(stdout, "END\n") ;
da(end_start, stdout) ; }
if (main_start)
{ fprintf(stdout, "MAIN\n") ;
da(main_start, stdout) ; }
}
static CODEBLOCK *
new_code()
{
CODEBLOCK *p = ZMALLOC(CODEBLOCK) ;
p->base = (INST *) zmalloc(INST_BYTES(PAGESZ)) ;
p->limit = p->base + PAGESZ ;
p->warn = p->limit - CODEWARN ;
p->ptr = p->base ;
return p ;
}
/* moves the active_code from MAIN to a BEGIN or END */
void
be_setup(scope)
int scope ;
{
*main_code_p = active_code ;
if (scope == SCOPE_BEGIN)
{
if (!begin_code_p) begin_code_p = new_code() ;
active_code = *begin_code_p ;
}
else
{
if (!end_code_p) end_code_p = new_code() ;
active_code = *end_code_p ;
}
}
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