224 lines
6.1 KiB
Diff
224 lines
6.1 KiB
Diff
diff -rc aterm-1142707243.10633/aterm/aterm.c aterm/aterm/aterm.c
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*** aterm-1142707243.10633/aterm/aterm.c 2006-02-08 11:35:28.000000000 +0100
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--- aterm/aterm/aterm.c 2006-04-25 17:10:52.000000000 +0200
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***************
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*** 193,198 ****
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--- 193,199 ----
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/* that have char == 2 bytes, and sizeof(header_type) == 2 */
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assert(sizeof(header_type) == sizeof(ATerm *));
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assert(sizeof(header_type) >= 4);
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+ assert(sizeof(ATerm) == sizeof(MachineWord));
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/*}}} */
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/*{{{ Initialize buffer */
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diff -rc aterm-1142707243.10633/aterm/memory.c aterm/aterm/memory.c
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*** aterm-1142707243.10633/aterm/memory.c 2006-03-09 15:02:56.000000000 +0100
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--- aterm/aterm/memory.c 2006-04-25 18:22:00.000000000 +0200
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***************
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*** 119,130 ****
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hash_number(tmp,3))
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*/
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#define HASHNUMBER3(t)\
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! FINISH(COMBINE(START(((MachineWord*)t)[0]), ((MachineWord*)t)[2]))
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#define HASHNUMBER4(t)\
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! FINISH(COMBINE(COMBINE(START(((MachineWord*)t)[0]), \
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! ((MachineWord*)t)[2]),((MachineWord*)t)[3]))
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#define HASHINT(val) \
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FINISH(COMBINE(START( (AT_INT<<SHIFT_TYPE) ), val))
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--- 119,171 ----
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hash_number(tmp,3))
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*/
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+ /* The ATerm library use some heavy aliasing. For instance, the
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+ various ATermXXX structures are referenced through MachineWord
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+ arrays. This is not generally allowed by the C standard --- see
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+ C99, section 6.5, clause 7. In particular, this means that you
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+ cannot assign something through an ATermXXX pointer, e.g.,
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+
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+ protoAppl->header = header;
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+
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+ and then read it through a MachineWord*, e.g.,
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+
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+ hnr = hash_number((ATerm) protoAppl, 2);
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+
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+ (hash_number walks over the term by casting it to a MachineWord*).
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+
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+ However, the same clause of the C standard also specifies that you
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+ *can* read the memory location through a union type that contains
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+ both the original type (e.g. ATermAppl) and the type used to read
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+ the memory location (e.g. MachineWord). That's what we do
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+ below: we have a union of all the types that occur in the various
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+ ATerm types. We then read the "w" element of the union. The
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+ compiler is not allowed to assume absence of aliasing with the
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+ other types in the union.
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+
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+ A better solution would be to hash the term through a character
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+ pointer (since *any* memory location can be legally read as a
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+ character), but I'm too lazy right now. Performance might also
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+ suffer if we do that. */
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+
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+ typedef union
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+ {
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+ MachineWord w;
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+ header_type header;
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+ ATerm term;
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+ ATermList list;
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+ int i;
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+ double d;
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+ void* p;
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+ } Aliaser;
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+
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+ #define GET_WORD(t, n) (((Aliaser*) (((MachineWord*) t) + n))->w)
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+
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#define HASHNUMBER3(t)\
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! FINISH(COMBINE(START(GET_WORD(t, 0)), GET_WORD(t, 2)))
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#define HASHNUMBER4(t)\
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! FINISH(COMBINE(COMBINE(START(GET_WORD(t, 0)), \
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! GET_WORD(t, 2)), GET_WORD(t, 3)))
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#define HASHINT(val) \
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FINISH(COMBINE(START( (AT_INT<<SHIFT_TYPE) ), val))
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***************
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*** 132,144 ****
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#endif /* HASHPEM */
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! #define PROTO_APPL_ARGS ((ATerm *) (protoTerm + ARG_OFFSET))
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#define SET_PROTO_APPL_ARG(i, a) \
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! (PROTO_APPL_ARGS[(i)] = (a))
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#define GET_PROTO_APPL_ARG(i) \
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! (PROTO_APPL_ARGS[(i)])
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#define CHECK_TERM(t) \
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assert((t) != NULL \
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--- 173,185 ----
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#endif /* HASHPEM */
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! #define PROTO_APPL_ARGS (protoTerm + ARG_OFFSET)
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#define SET_PROTO_APPL_ARG(i, a) \
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! (PROTO_APPL_ARGS[(i)] = (MachineWord) (a))
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#define GET_PROTO_APPL_ARG(i) \
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! ((ATerm) PROTO_APPL_ARGS[(i)])
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#define CHECK_TERM(t) \
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assert((t) != NULL \
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***************
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*** 323,336 ****
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#else
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static HashNumber hash_number(ATerm t, int size)
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{
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- MachineWord *words = (MachineWord *) t;
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int i;
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HashNumber hnr;
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! hnr = START(HIDE_AGE_MARK(words[0]));
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for (i=2; i<size; i++) {
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! hnr = COMBINE(hnr, words[i]);
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}
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return FINISH(hnr);
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--- 364,376 ----
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#else
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static HashNumber hash_number(ATerm t, int size)
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{
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int i;
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HashNumber hnr;
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! hnr = START(HIDE_AGE_MARK(GET_WORD(t, 0)));
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for (i=2; i<size; i++) {
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! hnr = COMBINE(hnr, GET_WORD(t, i));
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}
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return FINISH(hnr);
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***************
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*** 338,351 ****
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static HashNumber hash_number_anno(ATerm t, int size, ATerm anno)
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{
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- MachineWord *words = (MachineWord *) t;
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int i;
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HashNumber hnr;
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! hnr = START(HIDE_AGE_MARK(words[0]));
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for (i=2; i<size; i++) {
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! hnr = COMBINE(hnr, words[i]);
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}
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hnr = COMBINE(hnr, (MachineWord)anno);
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--- 378,390 ----
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static HashNumber hash_number_anno(ATerm t, int size, ATerm anno)
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{
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int i;
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HashNumber hnr;
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! hnr = START(HIDE_AGE_MARK(GET_WORD(t, 0)));
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for (i=2; i<size; i++) {
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! hnr = COMBINE(hnr, GET_WORD(t, i));
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}
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hnr = COMBINE(hnr, (MachineWord)anno);
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***************
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*** 1639,1645 ****
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protoAppl->header = header;
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CHECK_HEADER(protoAppl->header);
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! if (args != PROTO_APPL_ARGS) {
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for (i=0; i<arity; i++) {
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CHECK_TERM(args[i]);
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SET_PROTO_APPL_ARG(i, args[i]);
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--- 1678,1684 ----
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protoAppl->header = header;
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CHECK_HEADER(protoAppl->header);
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! if (args != (ATerm *) PROTO_APPL_ARGS) {
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for (i=0; i<arity; i++) {
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CHECK_TERM(args[i]);
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SET_PROTO_APPL_ARG(i, args[i]);
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***************
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*** 1680,1686 ****
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hashtable[hnr] = cur;
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}
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! if (args != PROTO_APPL_ARGS) {
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for (i=0; i<arity; i++) {
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protected_buffer[i] = NULL;
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}
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--- 1719,1725 ----
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hashtable[hnr] = cur;
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}
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! if (args != (ATerm *) PROTO_APPL_ARGS) {
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for (i=0; i<arity; i++) {
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protected_buffer[i] = NULL;
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}
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***************
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*** 2144,2150 ****
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}
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SET_PROTO_APPL_ARG(n, arg);
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! result = ATmakeApplArray(sym, PROTO_APPL_ARGS);
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annos = AT_getAnnotations((ATerm)appl);
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if (annos != NULL) {
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result = (ATermAppl)AT_setAnnotations((ATerm)result, annos);
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--- 2183,2189 ----
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}
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SET_PROTO_APPL_ARG(n, arg);
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! result = ATmakeApplArray(sym, (ATerm *) PROTO_APPL_ARGS);
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annos = AT_getAnnotations((ATerm)appl);
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if (annos != NULL) {
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result = (ATermAppl)AT_setAnnotations((ATerm)result, annos);
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