Hojun-Cho
83f5956df2
Every section banner dies (103 -> 0) across test/lang, the observer suites, the C carriers, and the five comment-heavy corpus fixtures; banner provenance (#N cites, carrier numbers, repair-cluster labels) folded into headers or adjacent WHY comments. Narration deleted; row provenance, ref cites, divergence pins, and layout contracts kept (fwd-ref decl-order guards and bootstrap-gate corpus rationale restored where the sweep over-cut). Comment-only proven: all 3742 wwbuild workdir .s byte-identical before/after; test-commit and test-byteid (161 lang + 1399 data, 0 pinned-divergent) green.
48 lines
1.7 KiB
Plaintext
48 lines
1.7 KiB
Plaintext
// Slicing an array whose dimension is a `def` constant
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// (`[MAX]T`) must resolve the length AND the capacity from the type table, not
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// the AST dimension node, migrated from test/wcc/989_defdim_slice_run.c (#21).
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// A `def MAX` dim arrives as a non-literal node; wwstage's cgslice default-hi
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// fell to MOVQ $0 (len 0 -> underflow, exit 255) and cgbasecap returned false
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// (cap fell back to len). The fix reads alen from the stamped array tinfo
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// (rule-13) in both the local and global arms of both helpers. cstage reads the
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// resolved bu->alen and was always correct; the defcap rows poison cap != len
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// so a stage that drops the cap word FAILS. T2 keeps the cs==ww net.
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//
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// Two def constants (MAX4/MAX6) and two globals (g4/g6) since one package
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// cannot redeclare `def MAX`; the def-dim path is exercised regardless of name.
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package defdim_slice_test;
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def MAX4: i32 = 4;
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def MAX6: i32 = 6;
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let g4: [MAX4]u8 = [10, 20, 30, 40];
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let g6: [MAX6]u8 = [1, 2, 3, 4, 5, 6];
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@test fn deflen_local() void = {
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// local default-hi: cgslice reads N=4 from tinfo; buf[1:].len = 4-1 = 3.
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let buf: [MAX4]u8 = [10, 20, 30, 40];
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let s: []u8 = buf[1:];
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assert(s.len: i32 == 3);
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};
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@test fn deflen_global() void = {
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// global default-hi: g4[1:].len = 4-1 = 3.
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let s: []u8 = g4[1:];
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assert(s.len: i32 == 3);
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};
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@test fn defcap_local() void = {
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// cgbasecap local: buf[2:4] over [6]u8 -> len 2, cap = 6-2 = 4 (cap != len).
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let buf: [MAX6]u8 = [1, 2, 3, 4, 5, 6];
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let s: []u8 = buf[2:4];
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assert(s.len: i32 == 2);
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assert(s.cap: i32 == 4);
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};
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@test fn defcap_global() void = {
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// cgbasecap global: g6[2:4] -> len 2, cap = 6-2 = 4.
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let s: []u8 = g6[2:4];
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assert(s.len: i32 == 2);
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assert(s.cap: i32 == 4);
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};
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