78 lines
1.6 KiB
Lua
78 lines
1.6 KiB
Lua
local function decode(line)
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local _, _, bits = line:find("^([^ ]+) ")
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if #bits ~= 32 then
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error("'"..bits.."' isn't 32 bits long")
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end
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local fields = {}
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local i = 1
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while i ~= 33 do
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local c = line:sub(i, i)
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if c ~= "." then
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local f = { pos=i }
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if c:find("%w") then
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f.size = 1
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f.value = c
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elseif c == "<" then
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local _, newi, name = line:find("^<%-*(%w+)%-*>", i)
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f.size = 1 + newi - i
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f.value = name
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i = newi
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else
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error("bad field char '"..c.."' in '"..line.."'")
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end
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if f.value:find("[0-9]+") then
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f.literal = true
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f.variable = false
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else
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f.literal = false
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f.variable = true
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end
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-- Convert from PowerPC numbering to sane numbering
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f.pos = 33-(f.pos + f.size)
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fields[#fields+1] = f
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end
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i = i + 1
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end
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return fields
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end
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local function emit(fields, code)
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local mask = 0
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local value = 0
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for _, f in ipairs(fields) do
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if f.literal then
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local s = math.pow(2, f.pos)
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local m = math.pow(2, f.size) - 1
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mask = mask + m*s
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value = value + f.value*s
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end
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end
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print(string.format("if ((value & 0x%x) == 0x%x) {", mask, value))
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for _, f in ipairs(fields) do
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if f.variable then
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local m = math.pow(2, f.size) - 1
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print(string.format("uint32_t %s = (value >> %d) & 0x%x;", f.value, f.pos, m))
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end
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end
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print(code)
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print("return;")
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print("}")
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end
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while true do
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local line = io.stdin:read("*l")
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if not line then
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break
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end
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line = line:gsub("#.*$", "")
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line = line:gsub(" *$", "")
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if line ~= "" then
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local fields = decode(line)
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emit(fields, line:sub(34, #line))
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end
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end
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