mirror of
https://github.com/notwa/lips
synced 2024-05-05 10:53:23 -07:00
split out overrides into their own table
This commit is contained in:
parent
12ca82e40a
commit
5fb0829319
412
lips.lua
412
lips.lua
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@ -1034,6 +1034,222 @@ function Parser:format_out(outformat, first, args, const, formatconst)
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f(self.dumper, self.line, first, out[1], out[2], out[3], out[4], out[5])
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end
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local overrides = {}
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function overrides.LI(self, h)
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local lui = instructions['LUI']
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local ori = instructions['ORI']
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local addiu = instructions['ADDIU']
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local args = {}
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args.rt = self:register()
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self:optional_comma()
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local im = self:const()
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-- for us, this is just semantics. for a "real" assembler,
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-- LA could add appropriate RELO LUI/ADDIU directives.
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if im[1] == 'LABELSYM' then
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self:error('use LA for labels')
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end
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im[2] = im[2] % 0x100000000
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if im[2] >= 0x10000 and im[2] <= 0xFFFF8000 then
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args.rs = args.rt
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args.immediate = {'UPPER', im}
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self:format_out(lui[3], lui[1], args, lui[4], lui[5])
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if im[2] % 0x10000 ~= 0 then
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args.immediate = {'LOWER', im}
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self:format_out(ori[3], ori[1], args, ori[4], ori[5])
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end
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elseif im[2] >= 0x8000 and im[2] < 0x10000 then
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args.rs = 'R0'
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args.immediate = {'LOWER', im}
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self:format_out(ori[3], ori[1], args, ori[4], ori[5])
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else
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args.rs = 'R0'
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args.immediate = {'LOWER', im}
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self:format_out(addiu[3], addiu[1], args, addiu[4], addiu[5])
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end
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end
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function overrides.LA(self, h)
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local lui = instructions['LUI']
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local addiu = instructions['ADDIU']
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local args = {}
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args.rt = self:register()
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self:optional_comma()
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local im = self:const()
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args.rs = args.rt
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args.immediate = {'UPPEROFF', im}
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self:format_out(lui[3], lui[1], args, lui[4], lui[5])
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args.immediate = {'LOWER', im}
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self:format_out(addiu[3], addiu[1], args, addiu[4], addiu[5])
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end
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function overrides.PUSH(self, h)
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local addi = instructions['ADDI']
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local w = instructions[h == 'PUSH' and 'SW' or 'LW']
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local jr = instructions['JR']
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local stack = {}
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while not self:is_EOL() do
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if self.tt == 'NUM' then
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if self.tok < 0 then
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self:error("can't push a negative number of spaces")
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end
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for i=1,self.tok do
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table.insert(stack, '')
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end
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self:advance()
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else
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table.insert(stack, self:register())
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end
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if not self:is_EOL() then
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self:optional_comma()
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end
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end
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if #stack == 0 then
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self:error(h..' requires at least one argument')
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end
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local args = {}
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if h == 'PUSH' then
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args.rt = 'SP'
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args.rs = 'SP'
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args.immediate = {'NEGATE', {'NUM', #stack*4}}
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self:format_out(addi[3], addi[1], args, addi[4], addi[5])
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end
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args.base = 'SP'
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for i, r in ipairs(stack) do
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args.rt = r
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if r ~= '' then
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args.offset = {'NUM', (i - 1)*4}
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self:format_out(w[3], w[1], args, w[4], w[5])
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end
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end
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if h == 'JPOP' then
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args.rs = 'RA'
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self:format_out(jr[3], jr[1], args, jr[4], jr[5])
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end
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if h == 'POP' or h == 'JPOP' then
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args.rt = 'SP'
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args.rs = 'SP'
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args.immediate = {'NUM', #stack*4}
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self:format_out(addi[3], addi[1], args, addi[4], addi[5])
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end
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end
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overrides.POP = overrides.PUSH
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overrides.JPOP = overrides.PUSH
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function overrides.NAND(self, h)
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local and_ = instructions['AND']
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local nor = instructions['NOR']
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local args = {}
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args.rd = self:register()
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self:optional_comma()
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args.rs = self:register()
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self:optional_comma()
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args.rt = self:register()
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self:format_out(and_[3], and_[1], args, and_[4], and_[5])
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args.rs = args.rd
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args.rt = 'R0'
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self:format_out(nor[3], nor[1], args, nor[4], nor[5])
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end
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function overrides.NANDI(self, h)
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local andi = instructions['ANDI']
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local nor = instructions['NOR']
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local args = {}
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args.rt = self:register()
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self:optional_comma()
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args.rs = self:register()
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self:optional_comma()
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args.immediate = self:const()
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self:format_out(andi[3], andi[1], args, andi[4], andi[5])
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args.rd = args.rt
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args.rs = args.rt
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args.rt = 'R0'
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self:format_out(nor[3], nor[1], args, nor[4], nor[5])
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end
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function overrides.NORI(self, h)
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local ori = instructions['ORI']
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local nor = instructions['NOR']
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local args = {}
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args.rt = self:register()
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self:optional_comma()
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args.rs = self:register()
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self:optional_comma()
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args.immediate = self:const()
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self:format_out(ori[3], ori[1], args, ori[4], ori[5])
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args.rd = args.rt
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args.rs = args.rt
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args.rt = 'R0'
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self:format_out(nor[3], nor[1], args, nor[4], nor[5])
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end
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function overrides.ROL(self, h)
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local sll = instructions['SLL']
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local srl = instructions['SRL']
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local or_ = instructions['OR']
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local args = {}
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local left = self:register()
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self:optional_comma()
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args.rt = self:register()
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self:optional_comma()
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args.immediate = self:const()
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args.rd = left
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if args.rd == 'AT' or args.rt == 'AT' then
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self:error('registers cannot be AT in this pseudo-instruction')
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end
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if args.rd == args.rt and args.rd ~= 'R0' then
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self:error('registers cannot be the same')
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end
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self:format_out(sll[3], sll[1], args, sll[4], sll[5])
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args.rd = 'AT'
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args.immediate = {'NUM', 32 - args.immediate[2]}
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self:format_out(srl[3], srl[1], args, srl[4], srl[5])
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args.rd = left
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args.rs = left
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args.rt = 'AT'
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self:format_out(or_[3], or_[1], args, or_[4], or_[5])
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end
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function overrides.ROR(self, h)
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local sll = instructions['SLL']
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local srl = instructions['SRL']
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local or_ = instructions['OR']
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local args = {}
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local right = self:register()
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self:optional_comma()
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args.rt = self:register()
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self:optional_comma()
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args.immediate = self:const()
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args.rd = right
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if args.rt == 'AT' or args.rd == 'AT' then
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self:error('registers cannot be AT in a pseudo-instruction that uses AT')
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end
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if args.rd == args.rt and args.rd ~= 'R0' then
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self:error('registers cannot be the same')
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end
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self:format_out(srl[3], srl[1], args, srl[4], srl[5])
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args.rd = 'AT'
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args.immediate = {'NUM', 32 - args.immediate[2]}
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self:format_out(sll[3], sll[1], args, sll[4], sll[5])
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args.rd = right
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args.rs = right
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args.rt = 'AT'
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self:format_out(or_[3], or_[1], args, or_[4], or_[5])
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end
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function overrides.JR(self, h)
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local args = {}
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if self:is_EOL() then
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args.rs = 'RA'
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else
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args.rs = self:register()
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end
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self:format_out(h[3], h[1], args, h[4], h[5])
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end
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function Parser:instruction()
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local name = self.tok
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local h = instructions[name]
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@ -1043,200 +1259,8 @@ function Parser:instruction()
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if h == nil then
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self:error('undefined instruction')
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elseif h == 'LI' then
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local lui = instructions['LUI']
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local ori = instructions['ORI']
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local addiu = instructions['ADDIU']
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local args = {}
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args.rt = self:register()
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self:optional_comma()
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local im = self:const()
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-- for us, this is just semantics. for a "real" assembler,
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-- LA could add appropriate RELO LUI/ADDIU directives.
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if im[1] == 'LABELSYM' then
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self:error('use LA for labels')
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end
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im[2] = im[2] % 0x100000000
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if im[2] >= 0x10000 and im[2] <= 0xFFFF8000 then
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args.rs = args.rt
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args.immediate = {'UPPER', im}
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self:format_out(lui[3], lui[1], args, lui[4], lui[5])
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if im[2] % 0x10000 ~= 0 then
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args.immediate = {'LOWER', im}
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self:format_out(ori[3], ori[1], args, ori[4], ori[5])
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end
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elseif im[2] >= 0x8000 and im[2] < 0x10000 then
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args.rs = 'R0'
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args.immediate = {'LOWER', im}
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self:format_out(ori[3], ori[1], args, ori[4], ori[5])
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else
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args.rs = 'R0'
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args.immediate = {'LOWER', im}
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self:format_out(addiu[3], addiu[1], args, addiu[4], addiu[5])
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end
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elseif h == 'LA' then
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local lui = instructions['LUI']
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local addiu = instructions['ADDIU']
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local args = {}
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args.rt = self:register()
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self:optional_comma()
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local im = self:const()
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args.rs = args.rt
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args.immediate = {'UPPEROFF', im}
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self:format_out(lui[3], lui[1], args, lui[4], lui[5])
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args.immediate = {'LOWER', im}
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self:format_out(addiu[3], addiu[1], args, addiu[4], addiu[5])
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elseif h == 'PUSH' or h == 'POP' or h == 'JPOP' then
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local addi = instructions['ADDI']
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local w = instructions[h == 'PUSH' and 'SW' or 'LW']
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local jr = instructions['JR']
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local stack = {}
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while not self:is_EOL() do
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if self.tt == 'NUM' then
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if self.tok < 0 then
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self:error("can't push a negative number of spaces")
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end
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for i=1,self.tok do
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table.insert(stack, '')
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end
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self:advance()
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else
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table.insert(stack, self:register())
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end
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if not self:is_EOL() then
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self:optional_comma()
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end
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end
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if #stack == 0 then
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self:error(h..' requires at least one argument')
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end
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local args = {}
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if h == 'PUSH' then
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args.rt = 'SP'
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args.rs = 'SP'
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args.immediate = {'NEGATE', {'NUM', #stack*4}}
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self:format_out(addi[3], addi[1], args, addi[4], addi[5])
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end
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args.base = 'SP'
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for i, r in ipairs(stack) do
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args.rt = r
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if r ~= '' then
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args.offset = {'NUM', (i - 1)*4}
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self:format_out(w[3], w[1], args, w[4], w[5])
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end
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end
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if h == 'JPOP' then
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args.rs = 'RA'
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self:format_out(jr[3], jr[1], args, jr[4], jr[5])
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end
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if h == 'POP' or h == 'JPOP' then
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args.rt = 'SP'
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args.rs = 'SP'
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args.immediate = {'NUM', #stack*4}
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self:format_out(addi[3], addi[1], args, addi[4], addi[5])
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end
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elseif h == 'NAND' then
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local and_ = instructions['AND']
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local nor = instructions['NOR']
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local args = {}
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args.rd = self:register()
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self:optional_comma()
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args.rs = self:register()
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self:optional_comma()
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args.rt = self:register()
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self:format_out(and_[3], and_[1], args, and_[4], and_[5])
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args.rs = args.rd
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args.rt = 'R0'
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self:format_out(nor[3], nor[1], args, nor[4], nor[5])
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elseif h == 'NANDI' then
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local andi = instructions['ANDI']
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local nor = instructions['NOR']
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local args = {}
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args.rt = self:register()
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self:optional_comma()
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args.rs = self:register()
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self:optional_comma()
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args.immediate = self:const()
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self:format_out(andi[3], andi[1], args, andi[4], andi[5])
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args.rd = args.rt
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args.rs = args.rt
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args.rt = 'R0'
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self:format_out(nor[3], nor[1], args, nor[4], nor[5])
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elseif h == 'NORI' then
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local ori = instructions['ORI']
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local nor = instructions['NOR']
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local args = {}
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args.rt = self:register()
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self:optional_comma()
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args.rs = self:register()
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self:optional_comma()
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args.immediate = self:const()
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self:format_out(ori[3], ori[1], args, ori[4], ori[5])
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args.rd = args.rt
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args.rs = args.rt
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args.rt = 'R0'
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self:format_out(nor[3], nor[1], args, nor[4], nor[5])
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elseif h == 'ROL' then
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local sll = instructions['SLL']
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local srl = instructions['SRL']
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local or_ = instructions['OR']
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local args = {}
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local left = self:register()
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self:optional_comma()
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args.rt = self:register()
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self:optional_comma()
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args.immediate = self:const()
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args.rd = left
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if args.rd == 'AT' or args.rt == 'AT' then
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self:error('registers cannot be AT in this pseudo-instruction')
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end
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if args.rd == args.rt and args.rd ~= 'R0' then
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self:error('registers cannot be the same')
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end
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self:format_out(sll[3], sll[1], args, sll[4], sll[5])
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args.rd = 'AT'
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args.immediate = {'NUM', 32 - args.immediate[2]}
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self:format_out(srl[3], srl[1], args, srl[4], srl[5])
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args.rd = left
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args.rs = left
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args.rt = 'AT'
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self:format_out(or_[3], or_[1], args, or_[4], or_[5])
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elseif h == 'ROR' then
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local sll = instructions['SLL']
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local srl = instructions['SRL']
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local or_ = instructions['OR']
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local args = {}
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local right = self:register()
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self:optional_comma()
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args.rt = self:register()
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self:optional_comma()
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args.immediate = self:const()
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args.rd = right
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if args.rt == 'AT' or args.rd == 'AT' then
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self:error('registers cannot be AT in a pseudo-instruction that uses AT')
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end
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if args.rd == args.rt and args.rd ~= 'R0' then
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self:error('registers cannot be the same')
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end
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self:format_out(srl[3], srl[1], args, srl[4], srl[5])
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args.rd = 'AT'
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args.immediate = {'NUM', 32 - args.immediate[2]}
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self:format_out(sll[3], sll[1], args, sll[4], sll[5])
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args.rd = right
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args.rs = right
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args.rt = 'AT'
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self:format_out(or_[3], or_[1], args, or_[4], or_[5])
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elseif name == 'JR' then
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local args = {}
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if self:is_EOL() then
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args.rs = 'RA'
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else
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args.rs = self:register()
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end
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self:format_out(h[3], h[1], args, h[4], h[5])
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elseif overrides[h] then
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overrides[h](self, h)
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elseif h[2] == 'tob' then -- or h[2] == 'Tob' then
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local lui = instructions['LUI']
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local args = {}
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