jri_md.h

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/* -*- Mode: C; tab-width: 4; -*- */
/*******************************************************************************
 * Java Runtime Interface - Machine Dependent Types
 * Copyright (c) 1996 Netscape Communications Corporation. All rights reserved.
 ******************************************************************************/
 
#ifndef JRI_MD_H
#define JRI_MD_H

#include <assert.h>

#ifdef __cplusplus
extern "C" {
#endif

/*******************************************************************************
 * WHAT'S UP WITH THIS FILE?
 * 
 * This is where we define the mystical JRI_PUBLIC_API macro that works on all
 * platforms. If you're running with Visual C++, Symantec C, or Borland's 
 * development environment on the PC, you're all set. Or if you're on the Mac
 * with Metrowerks, Symantec or MPW with SC you're ok too. For UNIX it shouldn't
 * matter.
 *
 * On UNIX though you probably care about a couple of other symbols though:
 *	IS_LITTLE_ENDIAN must be defined for little-endian systems
 *	HAVE_LONG_LONG must be defined on systems that have 'long long' integers
 *	HAVE_ALIGNED_LONGLONGS must be defined if long-longs must be 8 byte aligned
 *	HAVE_ALIGNED_DOUBLES must be defined if doubles must be 8 byte aligned
 *	IS_64 must be defined on 64-bit machines (like Dec Alpha)
 ******************************************************************************/

/* DLL Entry modifiers... */

/* PC */
#if defined(XP_PC) || defined(_WINDOWS) || defined(WIN32) || defined(_WIN32)
#	include <windows.h>
#	if defined(_MSC_VER)
#		if defined(WIN32) || defined(_WIN32)
#			define JRI_PUBLIC_API(ResultType)	_declspec(dllexport) ResultType
#			define JRI_CALLBACK
#		else /* !_WIN32 */
#		    if defined(_WINDLL)
#			define JRI_PUBLIC_API(ResultType)	ResultType __cdecl __export __loadds 
#			define JRI_CALLBACK			__loadds
#		    else /* !WINDLL */
#			define JRI_PUBLIC_API(ResultType)	ResultType __cdecl __export
#			define JRI_CALLBACK			__export
#                   endif /* !WINDLL */
#		endif /* !_WIN32 */
#	elif defined(__BORLANDC__)
#		if defined(WIN32) || defined(_WIN32)
#			define JRI_PUBLIC_API(ResultType)	__export ResultType
#			define JRI_CALLBACK
#		else /* !_WIN32 */
#			define JRI_PUBLIC_API(ResultType)	ResultType _cdecl _export _loadds 
#			define JRI_CALLBACK					_loadds
#		endif
#	else
#		error Unsupported PC development environment.	
#	endif
#	ifndef IS_LITTLE_ENDIAN
#		define IS_LITTLE_ENDIAN
#	endif

/* Mac */
#elif macintosh || Macintosh || THINK_C
#	if defined(__MWERKS__)				/* Metrowerks */
#		if !__option(enumsalwaysint)
#			error You need to define 'Enums Always Int' for your project.
#		endif
#		if defined(GENERATING68K) && !GENERATINGCFM 
#			if !__option(fourbyteints) 
#				error You need to define 'Struct Alignment: 68k' for your project.
#			endif
#		endif /* !GENERATINGCFM */
#	elif defined(__SC__)				/* Symantec */
#		error What are the Symantec defines? ([e-mail])
#	elif macintosh && applec			/* MPW */
#		error Please upgrade to the latest MPW compiler (SC).
#	else
#		error Unsupported Mac development environment.
#	endif
#	define JRI_PUBLIC_API(ResultType)		ResultType
#	define JRI_CALLBACK

/* Unix or else */
#else
#	define JRI_PUBLIC_API(ResultType)		ResultType
#	define JRI_CALLBACK
#endif

#ifndef FAR		/* for non-Win16 */
#define FAR
#endif

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

/* Java Scalar Types */

typedef unsigned char	jbool;
typedef char			jbyte;
typedef short			jchar;
typedef short			jshort;
#ifdef IS_64 /* XXX ok for alpha, but not right on all 64-bit architectures */
typedef unsigned int	juint;
typedef int				jint;
#else
typedef unsigned long	juint;
typedef long			jint;
#endif
typedef float			jfloat;
typedef double			jdouble;

typedef juint			jsize;

/*******************************************************************************
 * jlong : long long (64-bit signed integer type) support.
 ******************************************************************************/

/*
** Bit masking macros.  (n must be <= 31 to be portable)
*/
#define JRI_BIT(n)			((juint)1 << (n))
#define JRI_BITMASK(n)		(JRI_BIT(n) - 1)

#ifdef HAVE_LONG_LONG

#if !(defined(WIN32) || defined(_WIN32))
typedef long long			jlong;
typedef unsigned long long	julong;

#define jlong_MAXINT		0x7fffffffffffffffLL
#define jlong_MININT		0x8000000000000000LL
#define jlong_ZERO			0x0LL

#else
typedef LONGLONG			jlong;
typedef DWORDLONG			julong;

#define jlong_MAXINT		0x7fffffffffffffffi64
#define jlong_MININT		0x8000000000000000i64
#define jlong_ZERO			0x0i64

#endif

#define jlong_IS_ZERO(a)	((a) == 0)
#define jlong_EQ(a, b)		((a) == (b))
#define jlong_NE(a, b)		((a) != (b))
#define jlong_GE_ZERO(a)	((a) >= 0)
#define jlong_CMP(a, op, b)	((a) op (b))

#define jlong_AND(r, a, b)	((r) = (a) & (b))
#define jlong_OR(r, a, b)	((r) = (a) | (b))
#define jlong_XOR(r, a, b)	((r) = (a) ^ (b))
#define jlong_OR2(r, a)		((r) = (r) | (a))
#define jlong_NOT(r, a)		((r) = ~(a))

#define jlong_NEG(r, a)		((r) = -(a))
#define jlong_ADD(r, a, b)	((r) = (a) + (b))
#define jlong_SUB(r, a, b)	((r) = (a) - (b))

#define jlong_MUL(r, a, b)	((r) = (a) * (b))
#define jlong_DIV(r, a, b)	((r) = (a) / (b))
#define jlong_MOD(r, a, b)	((r) = (a) % (b))

#define jlong_SHL(r, a, b)	((r) = (a) << (b))
#define jlong_SHR(r, a, b)	((r) = (a) >> (b))
#define jlong_USHR(r, a, b)	((r) = (julong)(a) >> (b))
#define jlong_ISHL(r, a, b)	((r) = ((jlong)(a)) << (b))

#define jlong_L2I(i, l)		((i) = (int)(l))
#define jlong_L2UI(ui, l)	((ui) =(unsigned int)(l))
#define jlong_L2F(f, l)		((f) = (l))
#define jlong_L2D(d, l)		((d) = (l))

#define jlong_I2L(l, i)		((l) = (i))
#define jlong_UI2L(l, ui)	((l) = (ui))
#define jlong_F2L(l, f)		((l) = (f))
#define jlong_D2L(l, d)		((l) = (d))

#define jlong_UDIVMOD(qp, rp, a, b)  \
    (*(qp) = ((julong)(a) / (b)), \
     *(rp) = ((julong)(a) % (b)))

#else  /* !HAVE_LONG_LONG */

typedef struct {
#ifdef IS_LITTLE_ENDIAN
    juint lo, hi;
#else
    juint hi, lo;
#endif
} jlong;
typedef jlong				julong;

extern jlong jlong_MAXINT, jlong_MININT, jlong_ZERO;

#define jlong_IS_ZERO(a)	(((a).hi == 0) && ((a).lo == 0))
#define jlong_EQ(a, b)		(((a).hi == (b).hi) && ((a).lo == (b).lo))
#define jlong_NE(a, b)		(((a).hi != (b).hi) || ((a).lo != (b).lo))
#define jlong_GE_ZERO(a)	(((a).hi >> 31) == 0)

/*
 * NB: jlong_CMP and jlong_UCMP work only for strict relationals (<, >).
 */
#define jlong_CMP(a, op, b)	(((int32)(a).hi op (int32)(b).hi) ||          \
				 (((a).hi == (b).hi) && ((a).lo op (b).lo)))
#define jlong_UCMP(a, op, b)	(((a).hi op (b).hi) ||                    \
				 (((a).hi == (b).hi) && ((a).lo op (b).lo)))

#define jlong_AND(r, a, b)	((r).lo = (a).lo & (b).lo,                    \
				 (r).hi = (a).hi & (b).hi)
#define jlong_OR(r, a, b)	((r).lo = (a).lo | (b).lo,                    \
				 (r).hi = (a).hi | (b).hi)
#define jlong_XOR(r, a, b)	((r).lo = (a).lo ^ (b).lo,                    \
				 (r).hi = (a).hi ^ (b).hi)
#define jlong_OR2(r, a)		((r).lo = (r).lo | (a).lo,                    \
				 (r).hi = (r).hi | (a).hi)
#define jlong_NOT(r, a)		((r).lo = ~(a).lo,	                          \
				 (r).hi = ~(a).hi)

#define jlong_NEG(r, a)		((r).lo = -(int32)(a).lo,                     \
				 (r).hi = -(int32)(a).hi - ((r).lo != 0))
#define jlong_ADD(r, a, b) {                                              \
    jlong _a, _b;                                                         \
    _a = a; _b = b;                                                       \
    (r).lo = _a.lo + _b.lo;                                               \
    (r).hi = _a.hi + _b.hi + ((r).lo < _b.lo);                            \
}

#define jlong_SUB(r, a, b) {                                              \
    jlong _a, _b;                                                         \
    _a = a; _b = b;                                                       \
    (r).lo = _a.lo - _b.lo;                                               \
    (r).hi = _a.hi - _b.hi - (_a.lo < _b.lo);                             \
}                                                                         \

/*
 * Multiply 64-bit operands a and b to get 64-bit result r.
 * First multiply the low 32 bits of a and b to get a 64-bit result in r.
 * Then add the outer and inner products to r.hi.
 */
#define jlong_MUL(r, a, b) {                                              \
    jlong _a, _b;                                                         \
    _a = a; _b = b;                                                       \
    jlong_MUL32(r, _a.lo, _b.lo);                                         \
    (r).hi += _a.hi * _b.lo + _a.lo * _b.hi;                              \
}

/* XXX _jlong_lo16(a) = ((a) << 16 >> 16) is better on some archs (not on mips) */