d2bf8f3f2d
A type alias whose dimension is a named const (`Arr :: [N]T`) resolves its dimension eagerly during scanDecls pass 1, on the stateless registration path, which can only read `module_const_map`. Typed consts (`N : s64 : 16`) register only in pass 2 and a forward-declared untyped const had not registered yet, so the stateless resolver saw an empty table, printed a non-fatal warning, fabricated length 0, and continued — yielding a 0-byte alloca, garbage reads, and a segfault for slice/struct elements. - scanDecls pass 0 pre-registers every integer-valued module const before any type alias resolves, so typed, untyped, and forward-referenced consts all resolve identically. - Both dim resolvers now share `program_index.moduleConstInt`, so the stateful body-lowering path and the stateless registration path cannot diverge. - `resolveArrayLen` returns `?u32`; `resolveCompound` yields `.unresolved` on null instead of a 0-length array. The stateful path emits a diagnostic; the alias-registration path surfaces an unresolved alias as a clean compile error that aborts the build. The Vector lane-count `else => 0` is fixed the same way. Regressions: examples/0143 (typed-const dim direct + via alias for s64/string/ struct, forward-ref alias, nested) and examples/1129 (an unresolvable computed dim halts with a clean diagnostic + non-zero exit). Both fail on the pre-fix compiler (garbage/segfault; warning+exit0) and pass after.
66 lines
2.3 KiB
Plaintext
66 lines
2.3 KiB
Plaintext
// A named-const array dimension lays out identically whether the const is
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// TYPED (`N : s64 : 16`) or untyped (`N :: 16`), used DIRECTLY (`a : [N]T`) or
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// through a type alias (`Arr :: [N]T`), and regardless of whether the const is
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// declared before or after the alias that consumes it.
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//
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// Regression (issue 0083): the stateless registration-time resolver
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// (type_bridge) only saw module consts that were already in `module_const_map`
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// when a type alias resolved its dimension. Typed consts register in a later
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// pass, and a forward-declared untyped const had not registered yet — so the
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// alias dimension fabricated length 0 (a 0-byte alloca), and element access
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// returned garbage (scalars) or bus-errored (slice/struct elements). Module
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// consts are now pre-registered before any alias resolves, and both the
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// stateful and stateless paths share one dimension resolver.
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#import "modules/std.sx";
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NT : s64 : 8; // typed const used as a dimension
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P :: struct { x: s64; y: s64; }
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// Type aliases whose dimension is the TYPED const NT (stateless registration).
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TArr :: [NT]s64;
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TSArr :: [NT]string;
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TPArr :: [NT]P;
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// Forward reference: this alias is declared BEFORE its dimension const NF.
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FArr :: [NF]s64;
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NF :: 5;
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main :: () {
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// Typed-const dimension, DIRECT local decl.
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d : [NT]s64 = ---;
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d[0] = 3;
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d[7] = 21;
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print("direct d0={} d7={} len={}\n", d[0], d[7], d.len);
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// Typed-const dimension via ALIAS (scalar): same layout as the direct form.
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a : TArr = ---;
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a[0] = 7;
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a[7] = 99;
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print("alias a0={} a7={} len={}\n", a[0], a[7], a.len);
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// Typed-const dimension via ALIAS (string elements): no bus error.
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s : TSArr = ---;
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s[0] = "hi";
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s[7] = "yo";
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print("alias s0={} s7={}\n", s[0], s[7]);
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// Typed-const dimension via ALIAS (struct elements).
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ps : TPArr = ---;
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ps[0] = P.{ x = 1, y = 2 };
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ps[7] = P.{ x = 5, y = 6 };
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print("alias p0x={} p0y={} p7x={}\n", ps[0].x, ps[0].y, ps[7].x);
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// Nested fixed array whose both dimensions are the typed const NT.
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grid : [NT][NT]s64 = ---;
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grid[0][0] = 1;
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grid[7][7] = 10;
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print("nested g00={} g77={}\n", grid[0][0], grid[7][7]);
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// Forward-referenced alias dimension (untyped const declared after it).
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f : FArr = ---;
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f[0] = 4;
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f[4] = 40;
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print("fwd f0={} f4={} len={}\n", f[0], f[4], f.len);
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}
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