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43 lines
1.7 KiB
Lua
43 lines
1.7 KiB
Lua
-- passes/offsets.lua
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--
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-- Generate <module>/gen/<basename>.offsets.h with branch offset
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-- immediates for every atom_offset(F, T) reference in atom bodies.
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-- Ported from scripts/tape_atom.offset_gen.meta.lua:148-389.
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--
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-- The branch offset regression we just fixed in commit 98e27c2 must
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-- NOT return. The fix was in duffle.lua's split_top_level_commas +
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-- tape_atom_annotation_pass.lua's compute_component_word_count.
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-- word_count_eval.count_token_words (Task 1) preserves the fix.
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--
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-- Coding standard: tabs (1/level), EmmyLua annotations, no regex.
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--- @class M
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local M = {}
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--- @param ctx PassCtx
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--- @return PassResult
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function M.run(ctx)
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-- PORT NOTE: copy find_atoms, scan_atom_body, compute_offsets,
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-- generate_header, process_source from tape_atom.offset_gen.meta.lua
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-- lines 245-389.
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-- Adaptations:
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-- - Replace local word_count_of_token with word_count_eval.count_token_words
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-- - Take (ctx, src) instead of (source_path, word_counts) — read
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-- word counts from ctx.shared.word_counts
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-- - Return { outputs, errors, warnings } shape
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-- - Convert indentation from 8-space to tabs
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--
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-- For each src in ctx.sources:
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-- 1. Find MipsAtom_ declarations in src.text (find_atoms)
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-- 2. For each atom body, scan_atom_body to count words + find
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-- atom_label/atom_offset markers
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-- 3. compute_offsets (target_word - branch_word - 1 per pair)
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-- 4. generate_header emits "#define atom_offset__F__T (N)" +
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-- "enum { atom_offset__F__T = N, ... }" to <src.dir>/gen/<src.basename>.offsets.h
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-- 5. Add {offsets_h = path} to result.outputs
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error("passes.offsets.run: implement by porting from " ..
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"tape_atom.offset_gen.meta.lua:245-389")
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end
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return M |