d680b320f4
A module-global aggregate initializer rejected a `null` literal in a pointer (or optional-pointer) field as "must be initialized by a compile-time constant". `Lowering.constExprValue` had no `.null_literal` arm, so the null leaf returned no constant and the whole aggregate looked non-constant — even though `null` is the compile-time zero pointer (a top-level scalar `p : *s64 = null;` already serialized fine). Add `.null_literal => .null_val` to constExprValue. While here, make the two LLVM constant emitters exhaustive: emitConstAggregate and the top-level init_val switch in emit_llvm.zig previously ended in a silent `else => LLVMConstNull(...)` catch-all (the silent-arm class CLAUDE.md mandates rooting out). They now handle every ConstantValue tag explicitly (.null_val/.zeroinit -> all-zero constant, .undef -> LLVMGetUndef, .func_ref resolved, nested .vtable is a hard @panic tripwire). The reject-loud path for genuinely non-constant fields is preserved. Regression: examples/0138 (array-of-struct null ptr fields, array of all-null pointers, nested struct-in-struct null ptr) and the negative examples/1126 (null ptr field beside a non-const field still errors). Fail-before/pass-after verified.
49 lines
2.3 KiB
Plaintext
49 lines
2.3 KiB
Plaintext
// A module-global aggregate initializer may carry `null` in a pointer field:
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// `null` is a compile-time constant (the zero pointer), so the field reads back
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// as null with NO prior store, and its non-pointer neighbors keep their declared
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// values. Covered shapes: an array-of-struct with a null pointer field, a global
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// array of all-null pointers, and a nested struct-in-struct with a null pointer.
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// Regression (issue 0081): the constant-aggregate serializer had no
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// `.null_literal` arm, so a `null` in a pointer field made the whole aggregate
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// look non-constant and the global was rejected with "must be initialized by a
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// compile-time constant". The fix serializes a null literal to a constant zero
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// pointer (the same way a top-level pointer global `p : *s64 = null;` does)
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// while still rejecting genuinely non-constant fields (see diagnostics 1126).
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#import "modules/std.sx";
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Box :: struct { p: *s64; marker: s64; }
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Inner :: struct { q: *s64; tag: s64; }
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Outer :: struct { inner: Inner; label: s64; }
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// array-of-struct with null pointer fields + scalar neighbors
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boxes : [2]Box = .[ .{ p = null, marker = 11 }, .{ p = null, marker = 22 } ];
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// global array of all-null pointers
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ptrs : [3]*s64 = .[ null, null, null ];
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// nested: struct containing a struct with a null pointer field
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nested : [2]Outer = .[
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.{ inner = .{ q = null, tag = 1 }, label = 100 },
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.{ inner = .{ q = null, tag = 2 }, label = 200 },
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];
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main :: () {
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print("boxes ptrs={},{} markers={},{}\n",
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boxes[0].p == null, boxes[1].p == null, boxes[0].marker, boxes[1].marker);
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print("ptr arr nulls={},{},{}\n", ptrs[0] == null, ptrs[1] == null, ptrs[2] == null);
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print("nested q nulls={},{} tags={},{} labels={},{}\n",
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nested[0].inner.q == null, nested[1].inner.q == null,
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nested[0].inner.tag, nested[1].inner.tag,
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nested[0].label, nested[1].label);
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if boxes[0].p == null and boxes[1].p == null
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and boxes[0].marker == 11 and boxes[1].marker == 22
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and ptrs[0] == null and ptrs[1] == null and ptrs[2] == null
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and nested[0].inner.q == null and nested[1].inner.q == null
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and nested[0].inner.tag == 1 and nested[1].inner.tag == 2
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and nested[0].label == 100 and nested[1].label == 200 {
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print("PASS\n");
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} else {
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print("FAIL: global aggregate null pointer field mis-serialized\n");
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}
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}
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