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/* texmfmem.h: the memory_word type, which is too hard to translate
automatically from Pascal. We have to make sure the byte-swapping
that the (un)dumping routines do suffices to put things in the right
place in memory.
A memory_word can be broken up into a `twohalves' or a
`fourquarters', and a `twohalves' can be further broken up. Here is
a picture. ..._M = most significant byte, ..._L = least significant
byte.
If BigEndian:
twohalves.v: RH_M RH_L LH_M LH_L
twohalves.u: JNK1 JNK2 B0 B1
fourquarters: B0 B1 B2 B3
If LittleEndian:
twohalves.v: LH_L LH_M RH_L RH_M
twohalves.u: B1 B0 JNK1 JNK2
fourquarters: B3 B2 B1 B0
The halfword fields are four bytes if we are building a TeX or MF;
this leads to further complications:
BigEndian:
twohalves.v: RH_MM RH_ML RH_LM RH_LL LH_MM LH_ML LH_LM LH_LL
twohalves.u: ---------JUNK---------- B0 B1
fourquarters: B0 B1 B2 B3
LittleEndian:
twohalves.v: LH_LL LH_LM LH_ML LH_MM RH_LL RH_LM RH_ML RH_MM
twohalves.u: junkx junky B1 B0
fourquarters: ---------JUNK---------- B3 B2 B1 B0
I guess TeX and Metafont never refer to the B1 and B0 in the
fourquarters structure as the B1 and B0 in the twohalves.u structure.
This file can't be part of texmf.h, because texmf.h gets included by
{tex,mf}d.h before the `halfword' etc. types are defined. So we
include it from the change file instead.
*/
typedef union
{
struct
{
#ifdef WORDS_BIGENDIAN
halfword RH, LH;
#else
halfword LH, RH;
#endif
} v;
struct
{ /* Make B0,B1 overlap the most significant bytes of LH. */
#ifdef WORDS_BIGENDIAN
halfword junk;
quarterword B0, B1;
#else /* not WORDS_BIGENDIAN */
/* If 32-bit TeX/MF, have to have an extra two bytes of junk.
I would like to break this line, but I'm afraid that some
preprocessors don't properly handle backslash-newline in # commands. */
#if (defined (TeX) && !defined (SMALLTeX)) || !defined (TeX) && !defined (SMALLMF)
quarterword junkx, junky;
#endif /* big TeX or big MF */
quarterword B1, B0;
#endif /* not WORDS_BIGENDIAN */
} u;
} twohalves;
typedef struct
{
struct
{
#ifdef WORDS_BIGENDIAN
quarterword B0, B1, B2, B3;
#else
quarterword B3, B2, B1, B0;
#endif
} u;
} fourquarters;
typedef union
{
#ifdef TeX
glueratio gr;
twohalves hh;
#else
twohalves hhfield;
#endif
#ifdef WORDS_BIGENDIAN
integer cint;
fourquarters qqqq;
#else /* not WORDS_BIGENDIAN */
struct
{
#if defined (TeX) && !defined (SMALLTeX) || !defined (TeX) && !defined (SMALLMF) && !defined(SMALLMP)
halfword junk;
#endif /* big TeX or big MF or big MP */
integer CINT;
} u;
struct
{
#if defined (TeX) && !defined (SMALLTeX) || !defined (TeX) && !defined (SMALLMF) && !defined(SMALLMP)
halfword junk;
#endif /* big TeX or big MF or big MP */
fourquarters QQQQ;
} v;
#endif /* not WORDS_BIGENDIAN */
} memoryword;
/* To keep the original structure accesses working, we must go through
the extra names C forced us to introduce. */
#define b0 u.B0
#define b1 u.B1
#define b2 u.B2
#define b3 u.B3
#define rh v.RH
#define lhfield v.LH
#ifndef WORDS_BIGENDIAN
#define cint u.CINT
#define qqqq v.QQQQ
#endif
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