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/*
* Copyright (C) 2004-2008, Parrot Foundation.
*/
/*
=head1 NAME
examples/compiler/japhc.c
=head1 DESCRIPTION
example compiler used by japh16.pasm
=head1 SYNOPSIS
$ make -C examples/compilers/
$ parrot examples/japh/japh16.pasm
=head2 Functions
=over 4
=cut
*/
#include "parrot/parrot.h"
#define CONST_STRING(i, s) Parrot_str_new_constant((i), (s))
#define CONST_STRING_GEN(i, s) Parrot_str_new_constant((i), (s))
#include "pmc/pmc_sub.h"
#define C_DEBUG 0
#if C_DEBUG
# include <stdio.h>
# define cdebug(x) fprintf (x)
#else
# define cdebug(x)
#endif
INTVAL dynpmc_class_JaPHC;
PMC* japh_compiler(PARROT_INTERP, const char *s);
/*
=item C<void Parrot_lib_japhc_init(PARROT_INTERP, PMC* lib)>
loadlib calls the load and init hooks
we use init to register the compiler
=cut
*/
void
Parrot_lib_japhc_init(PARROT_INTERP, PMC* lib)
{
STRING *whoami;
cdebug((stderr, "japhc_init\n"));
whoami = CONST_STRING_GEN(interp, "JaPHC");
dynpmc_class_JaPHC = Parrot_pmc_register_new_type(interp, whoami);
/* Parrot_JaPHC_class_init(interp, dynpmc_class_JaPHC, 0); */
/* Parrot_compreg(interp, whoami, japh_compiler); */
}
/*
=item C<static int unescape(char *string)>
Unescape a string.
=cut
*/
static int
unescape(char *string)
{
char *start, *p;
for (start = p = string ; *string; string++) {
if (*string == '\\' && string[1]) {
switch (*++string) {
case 'n':
*p++ = '\n';
break;
default:
*p++ = *string;
break;
}
}
else
*p++ = *string;
}
*p = 0;
return p - start;
}
/*
=item C<static int add_const_str(PARROT_INTERP, PackFile_ConstTable *consts,
char *str)>
add constant string to constant_table
=cut
*/
static int
add_const_str(PARROT_INTERP, PackFile_ConstTable *consts, char *str)
{
int k, l;
char *o;
char *buf = o = strdup(str);
/*
* TODO strip delimiters in lexer, this needs adjustment in printint strings
*/
if (*buf == '"') {
buf++;
l = unescape(buf);
if (l)
buf[--l] = '\0';
}
else if (*buf == '\'') {
buf++;
l = strlen(buf);
if (l)
buf[--l] = '\0';
}
else {
l = unescape(buf);
}
/* Update the constant count and reallocate */
k = ++consts->const_count;
if (consts->constants == NULL)
consts->constants = mem_sys_allocate(
k * sizeof (PackFile_Constant *));
else
consts->constants = mem_sys_realloc(consts->constants,
k * sizeof (PackFile_Constant *));
/* Allocate a new constant */
consts->constants[--k] = PackFile_Constant_new(interp);
consts->constants[k]->type = PFC_STRING;
consts->constants[k]->u.string = Parrot_str_new_init(interp, buf,
(UINTVAL) l, Parrot_latin1_encoding_ptr, 0);
free(o);
return k;
}
/*
=item C<PMC* japh_compiler(PARROT_INTERP, const char *program)>
simple compiler - no error checking
=cut
*/
PMC*
japh_compiler(PARROT_INTERP, const char *program)
{
PackFile_ByteCode *cur_cs, *old_cs;
PackFile_ConstTable *consts;
opcode_t* pc;
const char *p;
PMC *sub;
Parrot_sub *sub_data;
#define CODE_SIZE 128
cdebug((stderr, "japh_compiler '%s'\n", program));
/*
* need some packfile segments
*/
cur_cs = PF_create_default_segs(interp, "JAPHc", 1);
old_cs = Parrot_switch_to_cs(interp, cur_cs, 0);
/*
* alloc byte code mem
*/
cur_cs->base.data = mem_sys_allocate(CODE_SIZE * sizeof (opcode_t));
cur_cs->base.size = CODE_SIZE;
consts = cur_cs->const_table;
/*
* now start compiling
*/
pc = cur_cs->base.data;
for (p = program; *p; ++p) {
switch (*p) {
case 'p': /* print_sc */
*pc++ = interp->op_lib->op_code("print_sc", 1);
/* const follows */
++p;
switch (*p) {
case 'J':
*pc++ = add_const_str(interp, consts, "Just ");
break;
case 'a':
*pc++ = add_const_str(interp, consts, "another ");
break;
case 'P':
*pc++ = add_const_str(interp, consts, "Parrot ");
break;
case 'H':
*pc++ = add_const_str(interp, consts, "Hacker");
break;
case 'n':
*pc++ = add_const_str(interp, consts, "\n");
break;
}
break;
case 'e': /* end */
*pc++ = interp->op_lib->op_code("invoke_p", 1);
*pc++ = 1;
break;
}
}
if (old_cs) {
/* restore old byte_code, */
(void)Parrot_switch_to_cs(interp, old_cs, 0);
}
/*
* create sub PMC
*/
sub = pmc_new(interp, enum_class_Eval);
PMC_get_sub(interp, sub, sub_data);
sub_data->seg = cur_cs;
sub_data->address = cur_cs->base.data;
sub_data->end = cur_cs->base.data + cur_cs->base.size;
sub_data->name = string_from_literal(interp, "JaPHC");
return sub;
}
/*
=back
=cut
*/
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4 cinoptions='\:2=2' :
*/
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