/* headers.c *******************************************************************

	Copyright (c) 1997 A. Krall, R. Grafl, M. Gschwind, M. Probst

	See file COPYRIGHT for information on usage and disclaimer of warranties

	This module replaces 'main' for header file generation. It also fakes some
	references to external modules which would otherwise depend on the header
	files generated by this very program.

	This module is quite a quick hack and not documented very well as a
	consequence.

	Authors: Reinhard Grafl      EMAIL: cacao@complang.tuwien.ac.at
	Changes: Mark Probst         EMAIL: cacao@complang.tuwien.ac.at
	         Philipp Tomsich     EMAIL: cacao@complang.tuwien.ac.at

	Last Change: $Id: headers.c 491 2003-10-20 17:56:03Z twisti $

*******************************************************************************/

#define CACAOH

#include "config.h" /* phil */
#include "global.h"
#include "tables.h"
#include "loader.h"


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

java_objectheader *javastring_new (utf *text)         /* schani */
{ return NULL; }

void throw_classnotfoundexception() 
{ 
	panic("class not found"); 
}

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_calljavamethod () { }
void asm_dumpregistersandcall () { }
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;}


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

s4 asm_builtin_checkarraycast(java_objectheader *o, constant_arraydescriptor *d) {return 0;}

#if defined(__I386__)
s4 asm_builtin_arrayinstanceof(java_objectheader *obj, classinfo *class) { return 0; }
void asm_builtin_anewarray (s4 size, classinfo *elementtype) {}
void asm_builtin_newarray_array (s4 size, constant_arraydescriptor *elementdesc) {}
#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* asm_initialize_thread_stack (void *func, u1 *stack) { return NULL; }
void asm_switchstackandcall () { }

java_objectheader *native_new_and_init (void *p) { return NULL; }

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

java_objectheader *exceptionptr;                       /* schani */
bool verbose =  false;

static chain *nativemethod_chain;		               /* chain with native methods     */
static chain *nativeclass_chain;		               /* chain with processed classes  */	
static chain *ident_chain;        /* chain with method and field names in current class */
static 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 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_arrayarray*");					       
				           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 ******************/

static 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 * 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);           

	/* rename overloaded method */
	if ((ident_count = searchidentchain_utf(m->name)))
		fprintf(file,"%d",ident_count - 1);		
	chain_addlast(ident_chain,m->name);	

	fprintf (file,"_");
	printID (m->name);
	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 ");

	    };

	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");
}


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

static void simple_classname(char *buffer, utf *u)
{
  int i, simplename_start;

  for (i=utf_strlen(u)-1; i>=0; i--) { 

	if (u->text[i] == '$') u->text[i] = '_'; else /* convert '$' to '_' */
    if (u->text[i] == '/') {
    	/* beginning of simple name */
        simplename_start = i+1;
		break;
	}
  }

  for (i=simplename_start; i < utf_strlen(u); i++) 
		  buffer[i-simplename_start] = u->text[i];

  buffer[i-simplename_start] = '\0';                
}

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

static void headerfile_generate (classinfo *c)
{
	char header_filename[1024] = "";
	char classname[1024]; 
	u2 i;
	methodinfo *m;	      		
		      
	/* store class in chain */		      
	chain_addlast (nativeclass_chain, c);								
			    	
	/* open headerfile for class */
	simple_classname(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"); 

	/* 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 */
		      		
	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);    				 
   	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 ****************/

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


/***************************************************************************

	create the nativetypes-headerfile which includes 
	the headerfiles of the classes stored in the classes-chain 

****************************************************************************/

static void headers_finish ()
{
	methodinfo *m;
	classinfo *c;
	char classname[1024];
	
	file = fopen ("nativetypes.hh", "w");
	if (!file) panic ("Can not open file 'native.h' to store header information");
	
	fprintf (file, "/* Headerfile for native methods: nativetypes.hh */\n");
	fprintf (file, "/* This file is machine generated, don't edit it !*/\n\n"); 	
	fprintf (file, "\n/* include native-Headerfiles */\n\n");
			
	c = chain_first (nativeclass_chain);
	while (c) {
	
		dopadding=false;
		simple_classname(classname,c->name);										    													
		fprintf(file,"#include \"nat/%s.h\"\n",classname);		
		c = chain_next (nativeclass_chain);		
	}

    fclose(file);
	chain_free (nativeclass_chain);
	
	/* create table of native-methods */

	file = fopen ("nativetable.hh", "w");
	if (!file) panic ("Can not open file 'nativetable' to store native-link-table");

	fprintf (file, "/* Table of native methods: nativetables.hh */\n");
	fprintf (file, "/* This file is machine generated, don't edit it !*/\n\n"); 

	while ( (m = chain_first (nativemethod_chain)) != NULL) {
		chain_remove (nativemethod_chain);		
		printnativetableentry (m);
	}
		
	chain_free (nativemethod_chain);
	fclose (file);

}


/******************** internal function: print_usage ************************

Prints usage information for the JAVA header generator to stdout.

***************************************************************************/

static void print_usage()
{
	printf ("USAGE: jch class [class..]\n");
}   



/************************** Function: main *******************************

   Main program.
   
**************************************************************************/

int main(int argc, char **argv)
{
	s4 i,a;
	char *cp;
	classinfo *topclass;
	void *dummy;
		

   /********** internal (only used by main) *****************************/
   
	char classpath[500] = "";
	char offsets_filename[1024] = ""; /* phil */
	u4 heapsize = 100000;

   /*********** options so only headers are generated *******************/
   
   makeinitializations=false;
   

   /************ Collect some info from the environment *****************/

	cp = getenv ("CLASSPATH");
	if (cp) {
		strcpy (classpath + strlen(classpath), ":");
		strcpy (classpath + strlen(classpath), cp);
		}

	if (argc < 2) {
   		print_usage ();
   		exit(10);
   		}


   /**************************** Program start **************************/

	log_init (NULL);
	log_text ("Java - header-generator started"); 
	
	sprintf(offsets_filename, "%s/offsets.h", SYSDEP_DIR); /* phil */
	file = fopen(offsets_filename, "w");
	if (file == NULL) {
		fprintf (stderr, "Can not open file '%s' for write", offsets_filename);
		exit(-1);
	}
	
	fprintf (file, "/* This file is machine generated, don't edit it !*/\n\n"); 

	fprintf (file, "#define offobjvftbl    %3d\n", (int) OFFSET(java_objectheader, vftbl));
	fprintf (file, "#define offarraysize   %3d\n", (int) OFFSET(java_arrayheader, size));
	fprintf (file, "#define offobjarrdata  %3d\n\n", (int) OFFSET(java_objectarray, data[0]));
	fprintf (file, "#define offbaseval     %3d\n", (int) OFFSET(vftbl, baseval));
	fprintf (file, "#define offdiffval     %3d\n", (int) OFFSET(vftbl, diffval));

	fclose (file);

	suck_init (classpath);
   
	tables_init ();
	heap_init (heapsize, heapsize, &dummy);
	loader_init ();


   /*********************** Load JAVA classes  **************************/
   	
	nativemethod_chain = chain_new ();
	nativeclass_chain = chain_new ();
	
	for (a=1; a<argc; a++) {   
 
  		cp = argv[a];

		/* convert classname */
   		for (i=strlen(cp)-1; i>=0; i--)    
			switch (cp[i]) {
 	  		  case '.': cp[i]='/';
				        break;
			  case '_': cp[i]='$';    
  	 		}
	
		topclass = loader_load ( utf_new_char (cp) );
		
        headerfile_generate (topclass);
	}

	headers_finish ();

   /************************ Release all resources **********************/

	loader_close ();
	heap_close ();
	tables_close ( literalstring_free );
	

   /* Print "finished" message */

	log_text ("Java - header-generator stopped");
	log_cputime ();
	mem_usagelog(1);
	
	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:
 */