wcc/ww: match on a tagged struct-field scrutinee reads it in place (#25)
wwstage cgmatch unconditionally spilled any non-ident match scrutinee -- including an addressable BP-relative N_DOT struct field -- into @match_spill and dispatched off the copy (frame $48); cstage reads such a field in place at its BP offset ($32). Both stages were already runtime-correct (latent rule-10 leanness, not a miscompile); this aligns wwstage down to cstage so the asm is byte-identical. The new in-place arm mirrors cstage cgen.c:10241-10296 verbatim: an N_DOT scrutinee with a bare N_IDENT base whose type chases to a value TY_STRUCT and whose field is found by name reads tag/payload at localfind(base)+field.offset. The *ptr-field and call-result cases stay on the spill path by construction (their base does not chase to TY_STRUCT) -- no extra guard. A global value-struct base mis-resolves identically in both stages (localfind returns 0); left untouched as a shared latent (#29), since a ww-only guard would break byte-id. Regenerates the w6c and wwdump combined.ww. Table-driven 831 test: 6 rows (local-field, *ptr-field, plain-ident, call-result, payload remap, str payload) x runtime-both-stages + cs-vs-ww byte-id.
This commit is contained in:
7
Makefile
7
Makefile
@@ -341,6 +341,7 @@ TESTS = $(BIN)/test_smoke $(BIN)/test_lex $(BIN)/test_parse $(BIN)/test_check \
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$(BIN)/test_tagged_return_scratch \
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$(BIN)/test_tagged_widen_f64 \
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$(BIN)/test_match_spill_pointer_payload \
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$(BIN)/test_match_field_inplace \
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$(BIN)/test_struct_byval_param \
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$(BIN)/test_struct_multi_return_scratch \
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$(BIN)/test_signed_data_emit \
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@@ -2113,6 +2114,12 @@ $(BIN)/test_match_spill_pointer_payload: test/wcc/716_match_spill_pointer_payloa
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$(LIB)/libwwrt.a | $(BIN)
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$(CC) $(CFLAGS) -o $@ $<
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$(BIN)/test_match_field_inplace: test/wcc/831_match_field_inplace.c \
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$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
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$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \
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$(LIB)/libwwrt.a | $(BIN)
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$(CC) $(CFLAGS) -o $@ $<
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$(BIN)/test_struct_byval_param: test/wcc/717_struct_byval_param.c \
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$(BIN)/ww $(BIN)/w6c $(BIN)/w6a $(BIN)/w6l \
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$(BIN)/ww_ww $(BIN)/w6c_ww $(BIN)/w6a_ww $(BIN)/w6l_ww \
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@@ -26298,6 +26298,41 @@ fn cgmatch(c: *cgen, n: *node) void = {
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};
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}; };
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} else {
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// M1 (#25): match on a tagged field of a BARE-ident VALUE
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// struct reads the box IN PLACE at base.off + field.offset
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// — the box (tag@+0, word0@+8, word1@+16) is contiguous in
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// the parent frame, so no @match_spill copy. Verbatim mirror
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// of cstage N_MATCH's in-place arm (cmd/w6c/cgen.c:10241-
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// 10296): gate on N_DOT with a bare-IDENT base whose stamped
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// type chases to TY_STRUCT and whose field resolves by name.
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// A *ptr-field base (`match (h.e)`, h:*struct) chases to
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// TY_PTR, the by-name scan misses, and it falls to the spill
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// arm below — exactly as cstage, no separate deref guard. A
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// global VALUE-struct base mis-resolves here in BOTH stages
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// (shared latent #29), matched identically — no ww-only
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// global guard. align-DOWN to cstage (rule 10): both stages
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// emit TEXT $32 on the local-field case.
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let mfld: *tfield = nil;
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if (scrut.kind == nkind.N_DOT && scrut.lhs != nil
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&& scrut.lhs.kind == nkind.N_IDENT
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&& scrut.lhs.type_ != nil) {
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let bu: *tinfo = tichase(scrut.lhs.type_: *tinfo);
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if (bu != nil && bu.kind == tykind.TY_STRUCT) {
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let fl: *tfield = bu.fields;
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for (fl != nil) {
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if (streq(fl.name, scrut.str)) {
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mfld = fl;
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break;
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};
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fl = fl.tnext;
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};
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};
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};
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if (mfld != nil) {
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let foff: i32 = mfld.offset: i32;
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scrutoff = localfind(c, scrut.lhs.str) + foff;
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scrutt = matchscrutt(c, scrut);
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} else {
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// Non-ident scrutinee (call result, arr[i], p.field,
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// ?, etc.). Spill into an `@match_spill` scratch slot
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// and dispatch off it. Tagged returns (N_CALL) follow
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@@ -26398,6 +26433,7 @@ fn cgmatch(c: *cgen, n: *node) void = {
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};
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};
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}; };
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};
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};
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};
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let endl: str = mklabel(c, "match_end");
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@@ -2952,6 +2952,41 @@ fn cgmatch(c: *cgen, n: *node) void = {
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};
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}; };
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} else {
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// M1 (#25): match on a tagged field of a BARE-ident VALUE
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// struct reads the box IN PLACE at base.off + field.offset
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// — the box (tag@+0, word0@+8, word1@+16) is contiguous in
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// the parent frame, so no @match_spill copy. Verbatim mirror
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// of cstage N_MATCH's in-place arm (cmd/w6c/cgen.c:10241-
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// 10296): gate on N_DOT with a bare-IDENT base whose stamped
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// type chases to TY_STRUCT and whose field resolves by name.
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// A *ptr-field base (`match (h.e)`, h:*struct) chases to
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// TY_PTR, the by-name scan misses, and it falls to the spill
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// arm below — exactly as cstage, no separate deref guard. A
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// global VALUE-struct base mis-resolves here in BOTH stages
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// (shared latent #29), matched identically — no ww-only
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// global guard. align-DOWN to cstage (rule 10): both stages
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// emit TEXT $32 on the local-field case.
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let mfld: *tfield = nil;
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if (scrut.kind == nkind.N_DOT && scrut.lhs != nil
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&& scrut.lhs.kind == nkind.N_IDENT
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&& scrut.lhs.type_ != nil) {
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let bu: *tinfo = tichase(scrut.lhs.type_: *tinfo);
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if (bu != nil && bu.kind == tykind.TY_STRUCT) {
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let fl: *tfield = bu.fields;
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for (fl != nil) {
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if (streq(fl.name, scrut.str)) {
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mfld = fl;
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break;
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};
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fl = fl.tnext;
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};
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};
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};
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if (mfld != nil) {
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let foff: i32 = mfld.offset: i32;
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scrutoff = localfind(c, scrut.lhs.str) + foff;
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scrutt = matchscrutt(c, scrut);
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} else {
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// Non-ident scrutinee (call result, arr[i], p.field,
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// ?, etc.). Spill into an `@match_spill` scratch slot
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// and dispatch off it. Tagged returns (N_CALL) follow
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@@ -3052,6 +3087,7 @@ fn cgmatch(c: *cgen, n: *node) void = {
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};
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};
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}; };
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};
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};
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};
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let endl: str = mklabel(c, "match_end");
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@@ -26298,6 +26298,41 @@ fn cgmatch(c: *cgen, n: *node) void = {
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};
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}; };
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} else {
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// M1 (#25): match on a tagged field of a BARE-ident VALUE
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// struct reads the box IN PLACE at base.off + field.offset
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// — the box (tag@+0, word0@+8, word1@+16) is contiguous in
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// the parent frame, so no @match_spill copy. Verbatim mirror
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// of cstage N_MATCH's in-place arm (cmd/w6c/cgen.c:10241-
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// 10296): gate on N_DOT with a bare-IDENT base whose stamped
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// type chases to TY_STRUCT and whose field resolves by name.
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// A *ptr-field base (`match (h.e)`, h:*struct) chases to
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// TY_PTR, the by-name scan misses, and it falls to the spill
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// arm below — exactly as cstage, no separate deref guard. A
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// global VALUE-struct base mis-resolves here in BOTH stages
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// (shared latent #29), matched identically — no ww-only
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// global guard. align-DOWN to cstage (rule 10): both stages
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// emit TEXT $32 on the local-field case.
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let mfld: *tfield = nil;
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if (scrut.kind == nkind.N_DOT && scrut.lhs != nil
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&& scrut.lhs.kind == nkind.N_IDENT
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&& scrut.lhs.type_ != nil) {
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let bu: *tinfo = tichase(scrut.lhs.type_: *tinfo);
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if (bu != nil && bu.kind == tykind.TY_STRUCT) {
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let fl: *tfield = bu.fields;
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for (fl != nil) {
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if (streq(fl.name, scrut.str)) {
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mfld = fl;
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break;
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};
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fl = fl.tnext;
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};
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};
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};
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if (mfld != nil) {
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let foff: i32 = mfld.offset: i32;
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scrutoff = localfind(c, scrut.lhs.str) + foff;
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scrutt = matchscrutt(c, scrut);
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} else {
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// Non-ident scrutinee (call result, arr[i], p.field,
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// ?, etc.). Spill into an `@match_spill` scratch slot
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// and dispatch off it. Tagged returns (N_CALL) follow
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@@ -26398,6 +26433,7 @@ fn cgmatch(c: *cgen, n: *node) void = {
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};
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};
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}; };
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};
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};
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};
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let endl: str = mklabel(c, "match_end");
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300
test/wcc/831_match_field_inplace.c
Normal file
300
test/wcc/831_match_field_inplace.c
Normal file
@@ -0,0 +1,300 @@
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/*
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* 831_match_field_inplace — match on a tagged-union struct-FIELD
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* scrutinee. wwstage cgmatch reads an addressable BP-relative field
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* (`match (b.t)`, b a local VALUE struct) IN PLACE at base.off +
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* field.offset, dispatching off the field's own slot — no @match_spill
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* copy. Verbatim mirror of cstage N_MATCH's in-place arm
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* (cmd/w6c/cgen.c:10241-10296). Task #25 (M1).
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*
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* Pre-fix (wwstage): the non-ident cgmatch branch unconditionally
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* spilled ANY non-ident scrutinee — including an addressable field —
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* into @match_spill (+16B scratch → frame TEXT $48). cstage read the
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* field where it lives (TEXT $32). Both stages were runtime-correct
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* (ken's battery), so this was a latent rule-10 leanness gap, not a
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* miscompile; the fix aligns wwstage DOWN to cstage so both emit
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* byte-identical asm.
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*
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* Predicate (copied from cstage): in-place iff the scrutinee is an
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* N_DOT whose lhs is a BARE N_IDENT with a stamped type, that type
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* chases to TY_STRUCT, and the field resolves by name. Everything else
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* — a *ptr-field base (`match (h.t)`, h:*struct, chases to TY_PTR so
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* the by-name scan misses), a plain-local tagged ident, a call-result
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* scrutinee — keeps its existing (in-place-ident / spill) path,
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* unchanged.
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*
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* What this table pins, per row, across BOTH driver stages plus a
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* cstage-vs-wwstage asm byte-identity check:
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* (a) local VALUE-struct tagged field [NEW in-place arm]
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* (b) *ptr-struct tagged field [stays on spill — TY_PTR]
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* (c) plain-local tagged ident [unchanged in-place-ident]
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* (d) call-result tagged scrutinee [spill]
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* (e) bool->int payload remap on a field [width: 1-word variants]
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* (f) str-payload (24B box) on a field [width: 3-word variant]
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*
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* The boundary, not just the new arm, is the subject: a regression
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* that mis-routed (b)/(c)/(d) into the in-place arm, or failed to route
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* (a)/(e)/(f) there, would break either the runtime exit code or the
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* byte-identity. The $48->$32 frame convergence itself is ken's
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* authoritative byte-id bind; a runtime test cannot observe frame size.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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static int
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runwait(const char *cmd)
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{
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int rc = system(cmd);
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if (rc == -1) return -1;
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if (WIFEXITED(rc)) return WEXITSTATUS(rc);
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return -1;
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}
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struct row { const char *label; const char *src; int want; };
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static const struct row rows[] = {
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/* (a) NEW in-place arm: local VALUE struct, field reassigned to
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* the int variant, matched in place. Returns 42. */
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{ "local_field_int_inplace",
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"package main;\n"
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"type box = struct { t: (int | bool), n: int };\n"
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"fn main() i32 = {\n"
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" let b: box = box { t = 0, n = 5 };\n"
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" b.t = 42;\n"
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" match (b.t) {\n"
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" case let n: int => return n: i32;\n"
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" case bool => return 1;\n"
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" };\n"
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"};\n",
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42 },
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/* (b) *ptr-struct field: base chases to TY_PTR, the by-name scan
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* misses, scrutinee falls to the spill path — exactly as cstage,
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* no separate deref guard. Returns 9. */
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{ "ptr_field_stays_spill",
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"package main;\n"
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"type box = struct { t: (int | bool), n: int };\n"
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"fn pick(h: *box) i32 = {\n"
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" match (h.t) {\n"
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" case let n: int => return n: i32;\n"
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" case bool => return 1;\n"
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" };\n"
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"};\n"
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"fn main() i32 = {\n"
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" let b: box = box { t = 9, n = 5 };\n"
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" return pick(&b);\n"
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"};\n",
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9 },
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/* (c) plain-local tagged ident: unchanged in-place-ident path
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* (not N_DOT). Returns 5. */
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{ "plain_local_ident",
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"package main;\n"
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"fn main() i32 = {\n"
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" let t: (int | bool) = 5;\n"
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" match (t) {\n"
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" case let n: int => return n: i32;\n"
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" case bool => return 1;\n"
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" };\n"
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"};\n",
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5 },
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/* (d) call-result tagged scrutinee: not N_DOT, keeps the spill
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* path. Returns 7. */
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{ "call_result_spill",
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"package main;\n"
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"fn mk(b: bool) (int | bool) = {\n"
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" if (b) { return 7; };\n"
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" return false;\n"
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"};\n"
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"fn main() i32 = {\n"
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" match (mk(true)) {\n"
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" case let n: int => return n: i32;\n"
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" case bool => return 1;\n"
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" };\n"
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"};\n",
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7 },
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/* (e) width: a field whose variant remaps from bool to int. The
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* in-place arm reads tag + one payload word at the field slot;
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* the int arm also reads a sibling field (b.n) to prove the
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* surrounding struct frame is undisturbed. Returns 7 + 5 = 12. */
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{ "field_bool_to_int_remap",
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"package main;\n"
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"type box = struct { t: (int | bool), n: int };\n"
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"fn main() i32 = {\n"
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" let b: box = box { t = true, n = 5 };\n"
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" b.t = 7;\n"
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" match (b.t) {\n"
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" case let n: int => return (n + b.n): i32;\n"
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" case bool => return 1;\n"
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" };\n"
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"};\n",
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12 },
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/* (f) width: a 24B str-payload variant read in place at the
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* field slot (tag@+0, .ptr@+8, .len@+16). Returns len("hello")
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* = 5. */
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{ "field_str_payload_24B",
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"package main;\n"
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"type box = struct { t: (str | int), n: int };\n"
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"fn main() i32 = {\n"
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" let b: box = box { t = 0, n = 5 };\n"
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" b.t = \"hello\";\n"
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||||
" match (b.t) {\n"
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" case let s: str => return len(s): i32;\n"
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" case int => return 99;\n"
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||||
" };\n"
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"};\n",
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5 },
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};
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static int
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run_driver(const char *driver, const struct row *r, int i)
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{
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char src[64], tmpdir[64], cmd[1024];
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snprintf(src, sizeof src, "/tmp/wcmfi_%d_%d.ww", getpid(), i);
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snprintf(tmpdir, sizeof tmpdir, "/tmp/wcmfi_%d_d_%d", getpid(), i);
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FILE *f = fopen(src, "wb");
|
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if (!f) return -1;
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fputs(r->src, f);
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fclose(f);
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||||
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mkdir(tmpdir, 0755);
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snprintf(cmd, sizeof cmd, "cd %s && %s build %s",
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tmpdir, driver, src);
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if (runwait(cmd) != 0) {
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fprintf(stderr, "row[%s]: build via %s failed\n",
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r->label, driver);
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unlink(src); rmdir(tmpdir);
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return -1;
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}
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const char *base = strrchr(src, '/');
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base = base ? base + 1 : src;
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char outbin[128];
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snprintf(outbin, sizeof outbin, "%s/%s", tmpdir, base);
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char *dot = strrchr(outbin, '.');
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if (dot && strcmp(dot, ".ww") == 0) *dot = '\0';
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||||
int got = runwait(outbin);
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||||
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||||
unlink(src); unlink(outbin); rmdir(tmpdir);
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return got;
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||||
}
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||||
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||||
/* asm_byte_identical — the whole point of M1 is that wwstage's frame
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||||
* stops bloating for an addressable field scrutinee, so the cstage vs
|
||||
* wwstage text output must match byte-for-byte on every row. */
|
||||
static int
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||||
asm_byte_identical(const char *bin, const struct row *r, int i)
|
||||
{
|
||||
char src[64], cs[64], ws[64], cmd[1024];
|
||||
snprintf(src, sizeof src, "/tmp/wcmfi_asm_%d_%d.ww", getpid(), i);
|
||||
snprintf(cs, sizeof cs, "/tmp/wcmfi_asm_%d_%d_c.s", getpid(), i);
|
||||
snprintf(ws, sizeof ws, "/tmp/wcmfi_asm_%d_%d_w.s", getpid(), i);
|
||||
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||||
FILE *f = fopen(src, "wb");
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||||
if (!f) return -1;
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||||
fputs(r->src, f);
|
||||
fclose(f);
|
||||
|
||||
snprintf(cmd, sizeof cmd, "%s/w6c -o %s %s 2>/dev/null", bin, cs, src);
|
||||
if (runwait(cmd) != 0) {
|
||||
fprintf(stderr, "row[%s]: w6c errored\n", r->label);
|
||||
unlink(src);
|
||||
return -1;
|
||||
}
|
||||
snprintf(cmd, sizeof cmd, "%s/w6c_ww -o %s %s 2>/dev/null",
|
||||
bin, ws, src);
|
||||
if (runwait(cmd) != 0) {
|
||||
fprintf(stderr, "row[%s]: w6c_ww errored\n", r->label);
|
||||
unlink(src); unlink(cs);
|
||||
return -1;
|
||||
}
|
||||
|
||||
FILE *fc = fopen(cs, "rb");
|
||||
FILE *fw = fopen(ws, "rb");
|
||||
int rc = 0;
|
||||
if (!fc || !fw) {
|
||||
rc = -1;
|
||||
} else {
|
||||
for (;;) {
|
||||
int a = fgetc(fc);
|
||||
int b = fgetc(fw);
|
||||
if (a != b) { rc = -1; break; }
|
||||
if (a == EOF) break;
|
||||
}
|
||||
}
|
||||
if (fc) fclose(fc);
|
||||
if (fw) fclose(fw);
|
||||
if (rc != 0)
|
||||
fprintf(stderr, "row[%s]: cstage vs wwstage asm differs\n",
|
||||
r->label);
|
||||
unlink(src); unlink(cs); unlink(ws);
|
||||
return rc;
|
||||
}
|
||||
|
||||
int
|
||||
main(void)
|
||||
{
|
||||
const char *bin = getenv("BIN");
|
||||
if (!bin) bin = "out/bin";
|
||||
char absbin[512];
|
||||
if (bin[0] != '/') {
|
||||
char cwd[256];
|
||||
if (getcwd(cwd, sizeof cwd) == NULL) return 1;
|
||||
snprintf(absbin, sizeof absbin, "%s/%s", cwd, bin);
|
||||
bin = absbin;
|
||||
}
|
||||
|
||||
char cdrv[640];
|
||||
snprintf(cdrv, sizeof cdrv, "%s/ww", bin);
|
||||
char wdrv[640];
|
||||
snprintf(wdrv, sizeof wdrv, "%s/ww_ww", bin);
|
||||
|
||||
struct { const char *name; const char *path; int gated_on_existence; }
|
||||
drivers[] = {
|
||||
{ "cstage", cdrv, 0 },
|
||||
{ "wwstage", wdrv, 1 },
|
||||
{ NULL, NULL, 0 },
|
||||
};
|
||||
|
||||
int n = (int)(sizeof rows / sizeof rows[0]);
|
||||
int total = 0, fail = 0;
|
||||
|
||||
for (int d = 0; drivers[d].name; d++) {
|
||||
if (drivers[d].gated_on_existence
|
||||
&& access(drivers[d].path, X_OK) != 0) {
|
||||
fprintf(stderr, "match_field_inplace: skip %s (no %s)\n",
|
||||
drivers[d].name, drivers[d].path);
|
||||
continue;
|
||||
}
|
||||
for (int i = 0; i < n; i++) {
|
||||
int got = run_driver(drivers[d].path, &rows[i], i);
|
||||
total++;
|
||||
if (got != rows[i].want) {
|
||||
fprintf(stderr,
|
||||
"match_field_inplace[%s][%s]: exit=%d want=%d\n",
|
||||
drivers[d].name, rows[i].label,
|
||||
got, rows[i].want);
|
||||
fail++;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (access(wdrv, X_OK) == 0) {
|
||||
for (int i = 0; i < n; i++) {
|
||||
total++;
|
||||
if (asm_byte_identical(bin, &rows[i], i) != 0)
|
||||
fail++;
|
||||
}
|
||||
}
|
||||
|
||||
if (fail) {
|
||||
fprintf(stderr,
|
||||
"match_field_inplace: %d/%d fixtures failed\n",
|
||||
fail, total);
|
||||
return 1;
|
||||
}
|
||||
printf("match_field_inplace: %d/%d ok\n", total, total);
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user