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Call concat metamethods #8

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Call concat metamethods #8

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10 changes: 4 additions & 6 deletions the-tiny-lua-compiler.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -3927,13 +3927,11 @@ function VirtualMachine:executeClosure(...)
-- OP_CONCAT [A, B, C] R(A) := R(B).. ... ..R(C)
-- Concatenate a range of registers and store the result in a register.
elseif opcode == "CONCAT" then
local values = {}
for reg = b, c do
table.insert(values, stack[reg])
for reg = c - 1, b, -1 do
-- We cannot use table.concat as it does not call metamethods
stack[reg] = stack[reg] .. stack[reg + 1]
end

-- Optimization: use table.concat for efficient string concatenation.
stack[a] = table.concat(values)
stack[a] = stack[b]

-- OP_JMP [A, sBx] pc+=sBx
-- Jump to a new instruction offset.
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