40d075ca98
Replace the explored byte-layout-override engine (offset-ordered LLVM structs /
weld plans / byte-blobs — all unnecessary) with a much simpler design: a welded
`struct abi(.zig) extern compiler { … }` is a bodied header declaring its fields
in the bound compiler type's MEMORY order. The compiler reflects the real Zig
type (field names via @typeInfo, offsets via @offsetOf, size via @sizeOf —
nothing hand-maintained) and validates the header matches, with loud diagnostics.
On pass it is an ordinary struct whose natural layout already equals the Zig
layout — no reorder, no padding, no index/remap tables, no special LLVM path — so
@ptrCast'ing it to the compiler's own type and dereferencing is byte-identical.
When types.zig shifts, the header stops matching and the developer gets a specific
message to fix it.
- compiler_lib.zig: weldStruct reflects field names and bakes bound_types fields
in ascending-offset (memory) order; deleted computeWeldPlan/WeldPlan/WeldElement.
- nominal.zig validateWeldedStruct: precise diagnostics — field-not-found,
wrong-field-order (+ expected memory order), type-layout (size) mismatch,
total-size mismatch.
- Examples: 0627 (StructInfo in memory order, byte-identical, usable),
1186 (source-order StructInfo -> wrong-field-order diagnostic); 1183 refreshed.
- Design doc + checkpoint updated.
21 lines
663 B
Plaintext
21 lines
663 B
Plaintext
// Diagnostic: a welded struct whose fields are NOT in the compiler type's memory
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// order is a loud build error — the sx header must mirror the real Zig layout so
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// the two are byte-identical. The message names the offending position and shows
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// the expected memory order. (Declaring StructInfo in source order trips this:
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// Zig reorders it to fields-first.)
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#import "modules/std.sx";
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compiler :: #library "compiler";
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Field :: struct abi(.zig) extern compiler { name: u32; ty: u32; }
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StructInfo :: struct abi(.zig) extern compiler {
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name: u32;
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fields: []Field;
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is_protocol: bool;
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nominal_id: u32;
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}
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main :: () { print("unreached\n"); }
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