mirror of
https://github.com/Ed94/pikuma_ps1.git
synced 2026-07-13 04:41:26 -07:00
395 lines
15 KiB
Lua
395 lines
15 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 preserves the fix.
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--
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-- THIS MODULE ALSO REQUIRES the recent fix to duffle.lua's
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-- split_top_level_commas (the second-half of the 98e27c2 fix):
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-- top-level comments must be appended to the previous token, not
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-- stripped, so the emit path preserves `// trailing comment` text
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-- for convert_line_comments_to_block to convert to `/* */`.
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--
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-- Coding standard: tabs (1/level), EmmyLua annotations, no regex.
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-- ════════════════════════════════════════════════════════════════════════════
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-- Module-scope requires + package.path setup
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-- ════════════════════════════════════════════════════════════════════════════
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local script_path = arg and arg[0] or "?"
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local last_sep = 0
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for i = 1, #script_path do
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local c = script_path:sub(i, i)
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if c == "/" or c == "\\" then last_sep = i end
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end
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local script_dir = last_sep == 0 and "./" or script_path:sub(1, last_sep)
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package.path = script_dir .. "../?.lua;" .. script_dir .. "../?/init.lua;" .. script_dir .. "?.lua;" .. package.path
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local duffle = require("duffle")
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local trim = duffle.trim
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local read_ident = duffle.read_ident
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local is_space = duffle.is_space
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local is_alpha = duffle.is_alpha
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local is_alnum = duffle.is_alnum
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local skip_ws_and_cmt = duffle.skip_ws_and_cmt
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local skip_str_or_cmt = duffle.skip_str_or_cmt
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local split_top_level_commas = duffle.split_top_level_commas
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local read_parens = duffle.read_parens
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local read_braces = duffle.read_braces
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local write_file = duffle.write_file
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local dirname = duffle.dirname
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local basename_no_ext = duffle.basename_no_ext
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local ensure_dir = duffle.ensure_dir
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local word_count_eval = require("word_count_eval")
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local count_token_words = word_count_eval.count_token_words
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-- ════════════════════════════════════════════════════════════════════════════
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-- Local helpers (ported from offset_gen.meta.lua lines 67-93)
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-- ════════════════════════════════════════════════════════════════════════════
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local function starts_with(s, prefix)
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if #s < #prefix then return false end
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for i = 1, #prefix do
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if s:sub(i, i) ~= prefix:sub(i, i) then return false end
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end
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return true
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end
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local function to_upper(s) return s:upper() end
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local function to_alnum_underscore(s)
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local out = ""
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for i = 1, #s do
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local c = s:sub(i, i)
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if is_alnum(c) then out = out .. c
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else out = out .. "_" end
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end
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return out
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end
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local function pad_right(s, w) return s .. string.rep(" ", w - #s) end
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-- ════════════════════════════════════════════════════════════════════════════
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-- Marker-call helpers (ported from offset_gen.meta.lua lines 148-205)
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-- ════════════════════════════════════════════════════════════════════════════
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--- Extract comma-separated identifier args from a parenthesized group
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--- after a function-like macro call.
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local function extract_ident_args(token, after_ident)
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local arg_start = skip_ws_and_cmt(token, after_ident)
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if token:sub(arg_start, arg_start) ~= "(" then return {}, nil end
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local inner, after_paren = read_parens(token, arg_start)
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local args = {}
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local n = 1
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local len = #inner
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while n <= len do
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n = skip_ws_and_cmt(inner, n)
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if n > len then break end
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local ident, after = read_ident(inner, n)
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if ident and ident ~= "" then
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table.insert(args, ident)
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n = after
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else
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n = n + 1
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end
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n = skip_ws_and_cmt(inner, n)
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if n <= len and inner:sub(n, n) == "," then n = n + 1 end
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end
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return args, after_paren
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end
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--- Scan a single token for atom_label/atom_offset markers, walking through
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--- balanced groups transparently (so nested calls are found).
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local function scan_for_atom_markers(token, at_pos, labels, branches)
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local i = 1
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local len = #token
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while i <= len do
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i = skip_ws_and_cmt(token, i)
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if i > len then break end
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local c = token:sub(i, i)
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if is_alpha(c) then
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local ident, after = read_ident(token, i)
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if ident == "atom_label" then
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local args, after_paren = extract_ident_args(token, after)
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if #args >= 1 then labels[args[1]] = at_pos end
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if after_paren then i = after_paren else i = after end
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elseif ident == "atom_offset" then
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local args, after_paren = extract_ident_args(token, after)
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if #args >= 2 then table.insert(branches, {pos = at_pos, target = args[2], tag = args[1]}) end
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if after_paren then i = after_paren else i = after end
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else
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i = after
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end
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else
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local nx = skip_str_or_cmt(token, i)
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if nx > i then i = nx else i = i + 1 end
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end
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end
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end
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--- Find the end position (just past the closing ')') of the first
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--- atom_label/atom_offset call in `tok`. Returns 0 if no such call.
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local function find_marker_call_end(tok)
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local i = 1
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local len = #tok
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while i <= len do
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i = skip_ws_and_cmt(tok, i)
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if i > len then break end
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local c = tok:sub(i, i)
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if is_space(c) then
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i = i + 1
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elseif c == "/" then
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-- comment — skip past it (delegated to duffle.skip_str_or_cmt)
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local nx = skip_str_or_cmt(tok, i)
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if nx > i then i = nx else i = i + 1 end
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else
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local ident, after = read_ident(tok, i)
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if ident == "atom_label" or ident == "atom_offset" then
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local j = skip_ws_and_cmt(tok, after)
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if tok:sub(j, j) == "(" then
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local _, end_paren = read_parens(tok, j)
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return end_paren - 1
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end
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return 0
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end
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i = after or (i + 1)
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end
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end
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return 0
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end
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-- ════════════════════════════════════════════════════════════════════════════
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-- Atom scanner (ported from offset_gen.meta.lua lines 245-321)
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-- ════════════════════════════════════════════════════════════════════════════
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--- Skip C qualifier keywords (static, const, etc.) and return the position
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--- past the last qualifier.
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local function skip_qualifiers(source, i)
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local keywords = {
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["static"] = true, ["const"] = true, ["volatile"] = true,
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["extern"] = true, ["register"] = true, ["auto"] = true,
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["inline"] = true, ["typedef"] = true,
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["internal"]= true, ["LP_"] = true, ["global"] = true, ["gkknown"] = true,
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}
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while true do
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i = skip_ws_and_cmt(source, i)
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local ident, after = read_ident(source, i)
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if not ident then return i end
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if keywords[ident] then i = after else return i end
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end
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end
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--- Find every MipsAtom_(name) { ... } in a source.
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local function find_atoms(source_text)
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local atoms = {}
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local len = #source_text
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local i = 1
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local function try_wrapped(after_pos)
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local paren_pos = skip_ws_and_cmt(source_text, after_pos)
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if source_text:sub(paren_pos, paren_pos) ~= "(" then return nil end
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local inner, after_paren = read_parens(source_text, paren_pos)
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local n = 1
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while n <= #inner and is_space(inner:sub(n, n)) do n = n + 1 end
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local ns = n
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while n <= #inner and is_alnum(inner:sub(n, n)) do n = n + 1 end
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local name = inner:sub(ns, n - 1)
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if name == "" then return nil end
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-- Find the brace after the parens.
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local brace_pos = duffle.scan_to_char(source_text, "{", after_paren)
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if not brace_pos then return nil end
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local body, after_brace = read_braces(source_text, brace_pos)
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return {name = name, body = body, after_brace = after_brace}
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end
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local function try_raw(after_pos)
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local next_pos = skip_ws_and_cmt(source_text, after_pos)
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local next_ident, next_after = read_ident(source_text, next_pos)
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if not next_ident then return nil end
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if not starts_with(next_ident, "code_") then return nil end
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if #next_ident <= 5 then return nil end
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local atom_name = next_ident:sub(6)
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local brace_pos = duffle.scan_to_char(source_text, "{", next_after)
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if not brace_pos then return nil end
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local body, after_brace = read_braces(source_text, brace_pos)
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return {name = atom_name, body = body, after_brace = after_brace}
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end
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while i <= len do
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i = skip_ws_and_cmt(source_text, i); if i > len then break end
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i = skip_qualifiers(source_text, i); if i > len then break end
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local ident, after = read_ident(source_text, i)
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if not ident then
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i = i + 1
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elseif ident == "MipsAtom_" then
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local atom = try_wrapped(after)
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if atom then
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table.insert(atoms, {name = atom.name, body = atom.body})
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i = atom.after_brace
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else
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i = i + 1
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end
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elseif ident == "MipsCode" then
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local atom = try_raw(after)
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if atom then
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table.insert(atoms, {name = atom.name, body = atom.body})
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i = atom.after_brace
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else
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i = after
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end
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else
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i = after
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end
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end
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return atoms
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end
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-- ════════════════════════════════════════════════════════════════════════════
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-- Per-atom body scan (ported from offset_gen.meta.lua lines 207-239)
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-- ════════════════════════════════════════════════════════════════════════════
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--- Scan an atom body for labels + branches, count total words.
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--- Returns (labels, branches, total_words).
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local function scan_atom_body(body, word_counts)
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local pos = 0
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local labels = {}
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local branches = {}
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for _, tok in ipairs(split_top_level_commas(body)) do
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local k = 1
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local tlen = #tok
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while k <= tlen and is_space(tok:sub(k, k)) do k = k + 1 end
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local leading_ident = read_ident(tok, k)
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if leading_ident == "atom_label" or leading_ident == "atom_offset" then
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-- Marker call: record at the current pos, do NOT advance pos.
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-- But the source pattern may bundle the marker with the next
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-- instruction on a new line (no top-level comma between them).
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-- In that case, the rest of `tok` after the marker call is
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-- a real instruction that must still be counted.
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scan_for_atom_markers(tok, pos, labels, branches)
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local marker_end = find_marker_call_end(tok)
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if marker_end > 0 and marker_end < #tok then
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local rest = trim(tok:sub(marker_end + 1))
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if rest ~= "" then
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local rest_words = count_token_words(rest, word_counts)
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pos = pos + rest_words
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end
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end
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else
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local words = count_token_words(tok, word_counts)
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scan_for_atom_markers(tok, pos, labels, branches)
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pos = pos + words
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end
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end
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return labels, branches, pos
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end
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-- ════════════════════════════════════════════════════════════════════════════
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-- Offset computation + header generation (ported lines 327-383)
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-- ════════════════════════════════════════════════════════════════════════════
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--- Compute branch offsets as (target_word - branch_word - 1).
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local function compute_offsets(labels, branches)
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local results = {}
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for _, br in ipairs(branches) do
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local target = labels[br.target]
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if not target then
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error("Branch target '" .. br.target .. "' has no atom_label (at word " .. br.pos .. ")")
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end
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table.insert(results, {target = br.target, tag = br.tag, offset = target - br.pos - 1})
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end
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return results
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end
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--- Generate the per-source .offsets.h header.
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local function generate_header(source_path, atoms_data)
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local basename = basename_no_ext(source_path)
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local lines = {}
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local function add(s) table.insert(lines, s) end
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add("// Auto-generated by ps1_meta.lua (passes/offsets.lua) — DO NOT EDIT")
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add("// Source: " .. source_path)
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add("#pragma once")
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add("")
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add("#pragma region " .. basename)
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add("")
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add("")
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for _, atom in ipairs(atoms_data) do
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if #atom.offsets > 0 then
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add("// --- atom: " .. atom.name .. " (" .. atom.total_words .. " words) ---")
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add("")
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local consts = {}
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for _, r in ipairs(atom.offsets) do
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table.insert(consts, {
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macro_name = "_atom_offset_" .. r.tag .. "_" .. r.target,
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enum_name = "atom_offset_" .. r.tag .. "_" .. r.target,
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value = r.offset,
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})
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end
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for _, c in ipairs(consts) do
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add("#define " .. pad_right(c.macro_name, 44) .. " " .. c.value)
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end
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add("")
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add("enum {")
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for _, c in ipairs(consts) do
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add(" " .. c.enum_name .. " = " .. c.macro_name .. ",")
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end
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add("};")
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add("")
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end
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end
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add("#pragma endregion " .. basename)
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add("")
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return table.concat(lines, "\n") .. "\n"
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end
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-- ════════════════════════════════════════════════════════════════════════════
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-- M.run — orchestrator entry
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-- ════════════════════════════════════════════════════════════════════════════
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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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local outputs = {}
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local errors = {}
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local warnings = {}
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for _, src in ipairs(ctx.sources) do
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local atoms = find_atoms(src.text)
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if #atoms > 0 then
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local atoms_data = {}
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for _, atom in ipairs(atoms) do
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local labels, branches, total = scan_atom_body(atom.body, ctx.shared.word_counts)
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local offsets = compute_offsets(labels, branches)
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table.insert(atoms_data, {
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name = atom.name,
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total_words = total,
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offsets = offsets,
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})
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end
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local out_path = src.dir .. "/gen/" .. basename_no_ext(src.dir) .. ".offsets.h"
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if not ctx.dry_run then
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ensure_dir(dirname(out_path))
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write_file(out_path, generate_header(src.path, atoms_data))
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end
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table.insert(outputs, { offsets_h = out_path })
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end
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end
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return { outputs = outputs, errors = errors, warnings = warnings }
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end
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return M |