/* headers.c - functions for header generation

   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003
   R. Grafl, A. Krall, C. Kruegel, C. Oates, R. Obermaisser,
   M. Probst, S. Ring, E. Steiner, C. Thalinger, D. Thuernbeck,
   P. Tomsich, J. Wenninger

   This file is part of CACAO.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2, or (at
   your option) any later version.

   This program is distributed in the hope that it will be useful, but
   WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
   02111-1307, USA.

   Contact: cacao@complang.tuwien.ac.at

   Authors: Reinhard Grafl

   Changes: Mark Probst
            Philipp Tomsich
            Christian Thalinger

   $Id: headers.c 1368 2004-08-01 21:50:08Z stefan $

*/


#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "config.h"
#include "global.h"
#include "tables.h"
#include "loader.h"
#include "options.h"
#include "builtin.h"
#include "mm/boehm.h"
#include "toolbox/chain.h"
#include "toolbox/memory.h"
#include "toolbox/logging.h"
#include "nat/java_lang_String.h"
#include "nat/java_lang_Throwable.h"


/******* replace some external functions  *********/
 
functionptr native_findfunction(utf *cname, utf *mname, utf *desc, bool isstatic)
{ return NULL; }

java_objectheader *javastring_new(utf *text) { return NULL; }
java_objectheader *javastring_new_char(char *text) { return NULL; }

char *javastring_tochar(java_objectheader *so) { return NULL; }
utf *javastring_toutf(java_lang_String *string, bool isclassname)
{ return NULL; }


java_objectheader *native_new_and_init(classinfo *c) { return NULL; }
java_objectheader *native_new_and_init_string(classinfo *c, java_lang_String *s) { return NULL; }
java_objectheader *native_new_and_init_int(classinfo *c, s4 i) { return NULL; }
java_objectheader *native_new_and_init_throwable(classinfo *c, java_lang_Throwable *t) { return NULL; }

java_objectheader *literalstring_new(utf *u) { return NULL; }  


void literalstring_free(java_objectheader *o) {}
void stringtable_update() { }
void synchronize_caches() { }
void asm_call_jit_compiler() { }
void asm_calljavafunction() { }
s4 asm_builtin_checkcast(java_objectheader *obj, classinfo *class) { return 0; }

s4 asm_builtin_idiv(s4 a, s4 b) {return 0;}
s4 asm_builtin_irem(s4 a, s4 b) {return 0;}
s8 asm_builtin_ldiv(s8 a, s8 b) {return 0;}
s8 asm_builtin_lrem(s8 a, s8 b) {return 0;}

s4 asm_builtin_f2i(float a) { return 0; }
s8 asm_builtin_f2l(float a) { return 0; }
s4 asm_builtin_d2i(double a) { return 0; }
s8 asm_builtin_d2l(double a) { return 0; }

void use_class_as_object() {}
void asm_builtin_monitorenter(java_objectheader *o) {}
void *asm_builtin_monitorexit(java_objectheader *o) {}

s4 asm_builtin_checkarraycast(java_objectheader *obj, vftbl_t *target) {return 0;}

#if defined(__MIPS__)
long compare_and_swap(long *p, long oldval, long newval)
{
	if (*p == oldval) {
		*p = newval;
		return oldval;
	} else
		return *p;
}
#endif


#if defined(__I386__)
s4 asm_builtin_arrayinstanceof(java_objectheader *obj, classinfo *class) { return 0; }
void asm_builtin_newarray(s4 size, vftbl_t *arrayvftbl) {}
#endif

void asm_builtin_aastore(java_objectarray *a, s4 index, java_objectheader *o) {}

u1 *createcompilerstub(methodinfo *m) {return NULL;}
u1 *createnativestub(functionptr f, methodinfo *m) {return NULL;}
u1 *oldcreatenativestub(functionptr f, methodinfo *m) {return NULL;}

void removecompilerstub(u1 *stub) {}
void removenativestub(u1 *stub) {}

void asm_perform_threadswitch(u1 **from, u1 **to, u1 **stackTop) {}
u1* asm_initialize_thread_stack(void *func, u1 *stack) { return NULL; }
void thread_restartcriticalsection() {}
void asm_switchstackandcall() {}
void asm_handle_builtin_exception(classinfo *c) {}
void asm_getclassvalues_atomic() {}

#if defined(__DARWIN__)
int cacao_catch_Handler() {}
#endif

#if defined(USE_THREADS) && defined(NATIVE_THREADS)
threadcritnode asm_criticalsections;
#endif


/************************ global variables **********************/

THREADSPECIFIC java_objectheader *_exceptionptr;

chain *nativemethod_chain;              /* chain with native methods          */
chain *nativeclass_chain;               /* chain with processed classes       */
static chain *ident_chain; /* chain with method and field names in current class */
FILE *file = NULL;
static u4 outputsize;
static bool dopadding;


static void printIDpart(int c) 
{
	if ((c >= 'a' && c <= 'z')
		|| (c >= 'A' && c <= 'Z')
		|| (c >= '0' && c <= '9')
		|| (c == '_'))
		putc(c, file);
	else
		putc('_', file);
}


static void printID(utf *u)
{
	char *utf_ptr = u->text;
	int i;

	for (i = 0; i < utf_strlen(u); i++) 
		printIDpart(utf_nextu2(&utf_ptr));
}


static void addoutputsize (int len)
{
	u4 newsize,i;
	if (!dopadding) return;

	newsize = ALIGN(outputsize, len);
	
	for (i = outputsize; i < newsize; i++) fprintf(file, "   u1 pad%d\n", (int) i);
	outputsize = newsize;
}

static void printOverloadPart(utf *desc)
{
	char *utf_ptr=desc->text;
	u2 c;

	fprintf(file,"__");
	while ((c=utf_nextu2(&utf_ptr))!=')') {
		switch (c) {
			case 'I':
			case 'S':
			case 'B':
			case 'C':
			case 'Z':
			case 'J':
			case 'F':
			case 'D': 
				fprintf (file, "%c",(char)c);
				break;
			case '[':
				fprintf(file,"_3");
                           	break;
			case 'L':
				putc('L',file);
				while ( (c=utf_nextu2(&utf_ptr)) != ';')
					printIDpart (c);
				fprintf(file,"_2");
				break;
			case '(':
				break;
			default: panic ("invalid method descriptor");
		}
	}
}

static char *printtype(char *utf_ptr)
{
	u2 c;

	switch (utf_nextu2(&utf_ptr)) {
	case 'V': fprintf (file, "void");
		break;
	case 'I':
	case 'S':
	case 'B':
	case 'C':
	case 'Z': addoutputsize (4);
		fprintf (file, "s4");
		break;
	case 'J': addoutputsize (8);
		fprintf (file, "s8");
		break;
	case 'F': addoutputsize (4);
		fprintf (file, "float");
		break;
	case 'D': addoutputsize (8);
		fprintf (file, "double");
		break;
	case '[':
		addoutputsize ( sizeof(java_arrayheader*) ); 
		switch (utf_nextu2(&utf_ptr)) {
		case 'I':  fprintf (file, "java_intarray*"); break;
		case 'J':  fprintf (file, "java_longarray*"); break;
		case 'Z':  fprintf (file, "java_booleanarray*"); break;
		case 'B':  fprintf (file, "java_bytearray*"); break;
		case 'S':  fprintf (file, "java_shortarray*"); break;
		case 'C':  fprintf (file, "java_chararray*"); break;
		case 'F':  fprintf (file, "java_floatarray*"); break;
		case 'D':  fprintf (file, "java_doublearray*"); break;
				
		case '[':  fprintf (file, "java_objectarray*");					       
			while ((c = utf_nextu2(&utf_ptr)) == '[') ;
			if (c=='L') 
				while (utf_nextu2(&utf_ptr) != ';');
			break;
                           
		case 'L':  fprintf (file, "java_objectarray*");
			while ( utf_nextu2(&utf_ptr) != ';');
			break;
		default: panic ("invalid type descriptor");
		}
		break;
		
	case 'L': 
		addoutputsize ( sizeof(java_objectheader*));
		fprintf (file, "struct ");
		while ( (c = utf_nextu2(&utf_ptr)) != ';' ) printIDpart (c);   	 
		fprintf (file, "*");
		break;
					
	default:  panic ("Unknown type in field descriptor");
	}
	
	return utf_ptr;
}


/***** determine the number of entries of a utf string in the ident chain *****/

static int searchidentchain_utf(utf *ident) 
{
	utf *u = chain_first(ident_chain);     /* first element of list */
	int count = 0;

	while (u) {
		if (u==ident) count++;         /* string found */
		u = chain_next(ident_chain);   /* next element in list */ 
	}

	return count;
}


/************** print structure for direct access to objects ******************/

static void printfields(classinfo *c)
{
	u4 i;
	fieldinfo *f;
	int ident_count;
	
	if (!c) {
		addoutputsize(sizeof(java_objectheader));
		fprintf(file, "   java_objectheader header;\n");
		return;
	}
		
	printfields(c->super);
	
	for (i = 0; i < c->fieldscount; i++) {
		f = &(c->fields[i]);
		
		if (!(f->flags & ACC_STATIC)) {
			fprintf(file, "   ");
			printtype(f->descriptor->text);
			fprintf(file, " ");
			utf_fprint(file, f->name);

			/* rename multiple fieldnames */
			if ((ident_count = searchidentchain_utf(f->name)))
				fprintf(file, "%d", ident_count - 1);
			chain_addlast(ident_chain, f->name);	

			fprintf(file, ";\n");
		}
	}
}


/***************** store prototype for native method in file ******************/

void printmethod(methodinfo *m)
{
	char *utf_ptr;
	u2 paramnum = 1;
	u2 ident_count;

	/* search for return-type in descriptor */	
	utf_ptr = m->descriptor->text;
	while (utf_nextu2(&utf_ptr) != ')');

	/* create remarks */
	fprintf(file, "\n/*\n * Class:     ");
	utf_fprint(file, m->class->name);
	fprintf(file, "\n * Method:    ");
	utf_fprint(file, m->name);
	fprintf(file, "\n * Signature: ");
	utf_fprint(file, m->descriptor);
	fprintf(file, "\n */\n");	

	/* create prototype */ 			
	fprintf(file, "JNIEXPORT ");				
	printtype(utf_ptr);
	fprintf(file, " JNICALL Java_");
	printID(m->class->name);           

	chain_addlast(ident_chain, m->name);	

	fprintf(file, "_");
	printID(m->name);
	if (m->nativelyoverloaded) printOverloadPart(m->descriptor);
	fprintf(file, "(JNIEnv *env");
	
	utf_ptr = m->descriptor->text + 1;
			
	if (!(m->flags & ACC_STATIC)) {
		fprintf(file, ", struct ");
		printID(m->class->name);
		fprintf(file, "* this");

	} else {
		fprintf(file, ", jclass clazz");
	}

	if ((*utf_ptr) != ')') fprintf(file, ", ");
			
	while ((*utf_ptr) != ')') {
		utf_ptr = printtype(utf_ptr);
		fprintf(file, " par%d", paramnum++);
		if ((*utf_ptr)!=')') fprintf(file, ", ");
	}
			
	fprintf(file, ");\n\n");
}


/******* remove package-name in fully-qualified classname *********************/

void gen_header_filename(char *buffer, utf *u)
{
	s4 i;
  
	for (i = 0; i < utf_strlen(u); i++) {
		if ((u->text[i] == '/') || (u->text[i] == '$')) {
			buffer[i] = '_';  /* convert '$' and '/' to '_' */

		} else {
			buffer[i] = u->text[i];
		}
	}
	buffer[utf_strlen(u)] = '\0';
}


/* create headerfile for classes and store native methods in chain ************/

void headerfile_generate(classinfo *c)
{
	char header_filename[1024] = "";
	char classname[1024]; 
	char uclassname[1024];
	u2 i;
	methodinfo *m;	      		
	u2 i2;
	methodinfo *m2;
	u2 nativelyoverloaded;	      		
		      
	/* store class in chain */		      
	chain_addlast(nativeclass_chain, c);
			    	
	/* open headerfile for class */
	gen_header_filename(classname, c->name);

	/* create chain for renaming fields */
	ident_chain = chain_new();
	
	sprintf(header_filename, "nat/%s.h", classname);
   	file = fopen(header_filename, "w");
   	if (!file) panic("Can not open file to store header information");

   	fprintf(file, "/* This file is machine generated, don't edit it !*/\n\n");

	/* convert to uppercase */
	for (i = 0; classname[i]; i++) {
		uclassname[i] = toupper(classname[i]);
	}
	uclassname[i] = '\0';

	fprintf(file, "#ifndef _%s_H\n#define _%s_H\n\n", uclassname, uclassname);

	/* create structure for direct access to objects */	
	fprintf(file, "/* Structure information for class: ");
	utf_fprint(file, c->name);
	fprintf(file, " */\n\n");
	fprintf(file, "typedef struct ");
	printID(c->name);							
	fprintf(file, " {\n");
	outputsize = 0;
	dopadding = true;

	printfields(c);

	fprintf(file, "} ");
	printID(c->name);
	fprintf(file, ";\n\n");

	/* create chain for renaming overloaded methods */
	chain_free(ident_chain);
	ident_chain = chain_new();

	/* create method-prototypes */
		      		
	/* find overloaded methods */
	for (i = 0; i < c->methodscount; i++) {

		m = &(c->methods[i]);

		if (!(m->flags & ACC_NATIVE)) continue;
		if (!m->nativelyoverloaded) {
			nativelyoverloaded=false;
			for (i2=i+1;i2<c->methodscount; i2++) {
				m2 = &(c->methods[i2]);
				if (!(m2->flags & ACC_NATIVE)) continue;
				if (m->name==m2->name) {
					m2->nativelyoverloaded=true;
					nativelyoverloaded=true;
				}
			}
			m->nativelyoverloaded=nativelyoverloaded;
		}

	}

	for (i = 0; i < c->methodscount; i++) {

		m = &(c->methods[i]);

		if (m->flags & ACC_NATIVE) {
			chain_addlast(nativemethod_chain, m);
			printmethod(m);
		}
	}

	chain_free(ident_chain);

	fprintf(file, "#endif\n\n");

   	fclose(file);
}


/******** print classname, '$' used to seperate inner-class name ***********/

void print_classname(classinfo *clazz)
{
	utf *u = clazz->name;
    char *endpos  = u->text + u->blength;
    char *utf_ptr = u->text; 
	u2 c;

    while (utf_ptr < endpos) {
		if ((c = utf_nextu2(&utf_ptr)) == '_') {
			putc('$', file);

		} else {
			putc(c, file);
		}
	}
} 


/*************** create table for locating native functions ****************/

void printnativetableentry(methodinfo *m)
{
	fprintf(file, "   { \"");
	print_classname(m->class);
	fprintf(file, "\",\n     \"");
	utf_fprint(file, m->name);
	fprintf(file, "\",\n     \"");
	utf_fprint(file, m->descriptor);
	fprintf(file, "\",\n     ");

	if ((m->flags & ACC_STATIC) != 0)
		fprintf(file, "true");
	else
		fprintf(file, "false");

	fprintf(file, ",\n     ");
	fprintf(file, "(functionptr) Java_");
	printID(m->class->name);
	fprintf(file,"_");
	printID(m->name);
	if (m->nativelyoverloaded) printOverloadPart(m->descriptor);
	fprintf(file,"\n   },\n");
}


void setVMClassField(classinfo *c)
{
}


void *Java_java_lang_VMObject_clone(void *env, void *clazz, void * this) {
	return 0;
}


/*
 * These are local overrides for various environment variables in Emacs.
 * Please do not remove this and leave it at the end of the file, where
 * Emacs will automagically detect them.
 * ---------------------------------------------------------------------
 * Local variables:
 * mode: c
 * indent-tabs-mode: t
 * c-basic-offset: 4
 * tab-width: 4
 * End:
 */