mirror of
https://github.com/notwa/lips
synced 2024-05-03 10:03:23 -07:00
reimplement variables and relative labels
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parent
91e028ef6a
commit
433d25a457
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@ -188,27 +188,32 @@ function Parser:tokenize(asm)
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end)
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end
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-- the lexer guarantees an EOL and EOF for a blank file
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assert(#tokens > 0, 'Internal Error: no tokens after preprocessing')
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local collector = Collector(self.options)
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local statements = collector:collect(tokens, self.main_fn)
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--[[
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local preproc = Preproc(self.options)
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self.statements = preproc:process(statements)
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-- the lexer guarantees an EOL and EOF for a blank file
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assert(#self.tokens > 0, 'Internal Error: no tokens after preprocessing')
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--]]
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self.statements = statements
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end
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function Parser:parse(asm)
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self:tokenize(asm)
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--[[ process:
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- inline constants
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- inline variables
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- inline labels? how do you know how far they are?
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i guess you can just offset on labels instead
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- assemble? dumper gets passed .org .base
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--]]
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-- DEBUG
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for i, s in ipairs(self.statements) do
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local values = ''
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for j, v in ipairs(s) do
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values = values..'\t'..v.tt
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values = values..'\t'..v.tt..'('..v.tok..')'
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end
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values = values:sub(2)
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print(i, s.type, values)
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235
lips/Preproc.lua
235
lips/Preproc.lua
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@ -2,8 +2,9 @@ local insert = table.insert
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local path = string.gsub(..., "[^.]+$", "")
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local data = require(path.."data")
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local Muncher = require(path.."Muncher")
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local Base = require(path.."Base")
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local Token = require(path.."Token")
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local Statement = require(path.."Statement")
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local abs = math.abs
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@ -19,6 +20,16 @@ local function signs(s)
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end
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end
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local function unsigns(n)
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if n > 0 then
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return string.rep('+', n)
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elseif n < 0 then
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return string.rep('-', -n)
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else
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return ''
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end
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end
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local function RelativeLabel(index, name)
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return {
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index = index,
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@ -26,91 +37,58 @@ local function RelativeLabel(index, name)
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}
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end
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local Preproc = Muncher:extend()
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local Preproc = Base:extend()
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function Preproc:init(options)
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self.options = options or {}
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end
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function Preproc:process(tokens)
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self.tokens = tokens
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local variables = {}
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local plus_labels = {} -- constructed forwards
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local minus_labels = {} -- constructed backwards
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-- first pass: resolve unary ops, variables, and collect relative labels
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local new_tokens = {}
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self.i = 0
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while self.i < #self.tokens do
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local t = self:advance()
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local sign = 1
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if t.tt == 'UNARY' then
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sign = t.tok
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local peek = self.tokens[self.i + 1]
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if peek.tt == 'UNARY' then
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self:error('unary operators cannot be chained')
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elseif peek.tt == 'EOL' or peek.tt == 'SEP' then
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t.tt = 'RELLABELSYM'
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t.tok = sign == 1 and '+' or sign == -1 and '-'
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elseif peek.tt == 'VARSYM' then
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t = self:advance()
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else
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self:error('expected a symbolic constant after unary operator')
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end
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end
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if t.tt == nil then
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error('Internal Error: missing token')
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elseif t.tt == 'VAR' then
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local t2 = self:advance()
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if t2.tt ~= 'NUM' then
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self:error('expected number for variable')
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end
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variables[t.tok] = t2.tok
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elseif t.tt == 'VARSYM' then
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local tt = 'NUM'
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local tok = variables[t.tok]
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if tok == nil then
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self:error('undefined variable')
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end
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insert(new_tokens, self:token(tt, tok * sign))
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elseif t.tt == 'RELLABEL' then
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local label = t.tok or ''
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local rl = RelativeLabel(#new_tokens + 1, label:sub(2))
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if label:sub(1, 1) == '+' then
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insert(plus_labels, rl)
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elseif label:sub(1, 1) == '-' then
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insert(minus_labels, 1, rl)
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else
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error('Internal Error: unexpected token for relative label')
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end
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insert(new_tokens, t)
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else
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insert(new_tokens, t)
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end
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function Preproc:error(msg, got)
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if got ~= nil then
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msg = msg..', got '..tostring(got)
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end
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error(('%s:%d: Error: %s'):format(self.fn, self.line, msg), 2)
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end
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-- second pass: resolve relative labels
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for i, t in ipairs(new_tokens) do
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self.fn = t.fn
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self.line = t.line
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--[[
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function Preproc:advance()
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self.i = self.i + 1
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self.s = self.statements[self.i]
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self.fn = self.s.fn
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self.line = self.s.line
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return self.s
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end
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--]]
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function Preproc:lookup(t)
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if t.tt == 'VARSYM' then
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local name = t.tok
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t.tt = 'NUM'
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t.tok = self.variables[name]
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if t.tok == nil then
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self:error('undefined variable', name)
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end
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elseif self.do_labels and t.tt == 'RELLABELSYM' or t.tt == 'RELLABEL' then
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if t.tt == 'RELLABEL' then
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t.tt = 'LABEL'
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-- exploits the fact that user labels can't begin with a number
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local name = t.tok:sub(2)
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t.tok = tostring(i)..name
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t.tok = tostring(self.i)..name
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elseif t.tt == 'RELLABELSYM' then
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local i = self.i
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t.tt = 'LABELSYM'
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local rel = signs(t.tok)
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if rel == 0 then
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error('Internal Error: relative label without signs')
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end
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assert(rel ~= 0, 'Internal Error: relative label without signs')
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local name = t.tok:sub(abs(rel) + 1)
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local seen = 0
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-- TODO: don't iterate over *every* label, just the ones nearby
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-- TODO: don't iterate over *every* label, just the ones nearby.
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-- we could do this by popping labels as we pass over them.
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-- (would need to iterate once forwards and once backwards
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-- for plus and minus labels respectively)
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if rel > 0 then
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for _, rl in ipairs(plus_labels) do
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for _, rl in ipairs(self.plus_labels) do
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if rl.name == name and rl.index > i then
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seen = seen + 1
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if seen == rel then
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@ -120,7 +98,7 @@ function Preproc:process(tokens)
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end
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end
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else
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for _, rl in ipairs(minus_labels) do
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for _, rl in ipairs(self.minus_labels) do
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if rl.name == name and rl.index < i then
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seen = seen - 1
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if seen == rel then
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@ -132,50 +110,105 @@ function Preproc:process(tokens)
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end
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if seen ~= rel then
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self:error('could not find appropriate relative label')
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self:error('could not find appropriate relative label', unsigns(rel))
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end
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end
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else
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return false
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end
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return true
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end
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function Preproc:check(s, i, tt)
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local t = s[i]
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if t == nil then
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self:error("expected another argument")
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end
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self.tokens = new_tokens
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new_tokens = {}
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self.fn = t.fn
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self.line = t.line
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-- third pass: resolve specials
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self.i = 0
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while self.i < #self.tokens do
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local t = self:advance()
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if t.tt == 'SPECIAL' then
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local name, args = self:special()
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-- TODO: split to its own file, not unlike overrides.lua
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if name == 'hi' then
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if #args ~= 1 then
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self:error('%hi expected exactly one argument')
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if t.tt ~= tt then
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self:lookup(t)
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--[[
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local newtt, newtok = self:lookup(argtt, argtok)
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if newtt and newtok then
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argtt, argtok = newtt, newtok
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end
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--]]
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end
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if t.tt ~= tt then
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local err = ("argument %i of %s expected type %s"):format(i, s.type, tt)
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self:error(err, t.tt)
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end
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return t.tok
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end
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function Preproc:process(statements)
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self.statements = statements
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self.variables = {}
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self.plus_labels = {} -- constructed forwards
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self.minus_labels = {} -- constructed backwards
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self.do_labels = false
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-- first pass: resolve variables and collect relative labels
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local new_statements = {}
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for i=1, #self.statements do
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local s = self.statements[i]
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self.fn = s.fn
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self.line = s.line
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if s.type:sub(1, 1) == '!' then
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-- directive, label, etc.
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if s.type == '!VAR' then
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local a = self:check(s, 1, 'VAR')
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local b = self:check(s, 2, 'NUM')
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self.variables[a] = b
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elseif s.type == '!LABEL' then
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if s[1].tt == 'RELLABEL' then
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local label = s[1].tok
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local rl = RelativeLabel(#new_statements + 1, label:sub(2))
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local c = label:sub(1, 1)
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if c == '+' then
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insert(self.plus_labels, rl)
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elseif c == '-' then
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insert(self.minus_labels, 1, rl) -- remember, it's backwards
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else
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error('Internal Error: unexpected token for relative label')
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end
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end
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local tnew = self:token(args[1]):set('portion', 'upperoff')
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insert(new_tokens, tnew)
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elseif name == 'up' then
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if #args ~= 1 then
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self:error('%up expected exactly one argument')
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end
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local tnew = self:token(args[1]):set('portion', 'upper')
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insert(new_tokens, tnew)
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elseif name == 'lo' then
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if #args ~= 1 then
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self:error('%lo expected exactly one argument')
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end
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local tnew = self:token(args[1]):set('portion', 'lower')
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insert(new_tokens, tnew)
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else
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self:error('unknown special')
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insert(new_statements, s)
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end
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else
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insert(new_tokens, t)
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-- regular instruction
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for j, t in ipairs(s) do
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self:lookup(t)
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--[[
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local newtt, newtok = self:lookup(t.tt, t.tok)
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if newtt and newtok then
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else
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end
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--]]
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end
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insert(new_statements, s)
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end
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end
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self.tokens = new_tokens
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-- second pass: resolve relative labels
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self.do_labels = true
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for i=1, #new_statements do
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self.i = i -- make visible to :lookup
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local s = new_statements[i]
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self.fn = s.fn
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self.line = s.line
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for j, t in ipairs(s) do
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self:lookup(t)
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end
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end
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return self.tokens
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self.statements = new_statements
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return self.statements
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end
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return Preproc
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