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Big revamp in the implmentation of labels/gotos

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Added restriction that, when a label is created, there cannot be
another label with the same name visible. That allows backward goto's
to be resolved when they are read. Backward goto's get a close if
they jump out of the scope of some variable; labels get a close only
if previous goto to it jumps out of the scope of some upvalue.
This commit is contained in:
Roberto Ierusalimschy
2018-10-29 14:26:48 -03:00
parent 6e9b719694
commit a006514ea1
8 changed files with 131 additions and 182 deletions
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19
testes/code.lua
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@@ -297,7 +297,7 @@ check(function ()
b[a], a = c, b
a, b = c, a
a = a
end,
end,
'LOADNIL',
'MOVE', 'MOVE', 'SETTABLE',
'MOVE', 'MOVE', 'MOVE', 'SETTABLE',
@@ -329,18 +329,13 @@ checkequal(function (l) local a; return 0 <= a and a <= l end,
function (l) local a; return not (not(a >= 0) or not(a <= l)) end)
-- if-goto optimizations
check(function (a, b, c, d, e)
if a == b then goto l1;
elseif a == c then goto l2;
elseif a == d then goto l2;
else if a == e then goto l3;
else goto l3
end
-- if-break optimizations
check(function (a, b)
while a do
if b then break else a = a + 1 end
end
::l1:: ::l2:: ::l3:: ::l4::
end, 'EQ', 'JMP', 'EQ', 'JMP', 'EQ', 'JMP', 'EQ', 'JMP', 'JMP',
'CLOSE', 'CLOSE', 'CLOSE', 'CLOSE', 'RETURN0')
end,
'TEST', 'JMP', 'TEST', 'JMP', 'ADDI', 'JMP', 'RETURN0')
checkequal(
function (a) while a < 10 do a = a + 1 end end,