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New implementation for constants

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VLOCAL expressions keep a reference to their corresponding 'Vardesc',
and 'Upvaldesc' (for upvalues) has a field 'ro' (read-only). So, it is
easier to check whether a variable is read-only. The decoupling in
VLOCAL between 'vidx' ('Vardesc' index) and 'sidx' (stack index)
should also help the forthcoming implementation of compile-time
constant propagation.
This commit is contained in:
Roberto Ierusalimschy
2019-07-09 10:43:17 -03:00
parent e888976bc6
commit 54f7b46c1e
8 changed files with 125 additions and 131 deletions
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18
testes/locals.lua
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@@ -177,14 +177,24 @@ do -- constants
local <const> a, b, <const> c = 10, 20, 30
b = a + c + b -- 'b' is not constant
assert(a == 10 and b == 60 and c == 30)
local function checkro (code, name)
local function checkro (name, code)
local st, msg = load(code)
local gab = string.format("attempt to assign to const variable '%s'", name)
assert(not st and string.find(msg, gab))
end
checkro("local x, <const> y, z = 10, 20, 30; x = 11; y = 12", "y")
checkro("local <const> x, y, <const> z = 10, 20, 30; x = 11", "x")
checkro("local <const> x, y, <const> z = 10, 20, 30; y = 10; z = 11", "z")
checkro("y", "local x, <const> y, z = 10, 20, 30; x = 11; y = 12")
checkro("x", "local <const> x, y, <const> z = 10, 20, 30; x = 11")
checkro("z", "local <const> x, y, <const> z = 10, 20, 30; y = 10; z = 11")
checkro("z", [[
local a, <const> z, b = 10;
function foo() a = 20; z = 32; end
]])
checkro("var1", [[
local a, <const> var1 = 10;
function foo() a = 20; z = function () var1 = 12; end end
]])
end