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In a loop statement like `for (let x = 1, y = 2; ...)` the initialization
statement was incorrectly interpreted as `let x = 1; y = 2` instead of the
correct `let ..., y = 2`, triggering reference error exceptions in strict
mode.
Solve the issue by continue parsing the rest of the comma expression
seqence as declaration list expression when the initializer is compiled
in local mode.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Support per-file and per-function `"use strict";` statement to opt into
strict variable handling from ucode source code.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Instead of relying on json_object values internally, use custom types to
represent the different ucode value types which brings a number of
advantages compared to the previous approach:
- Due to the use of tagged pointers, small integer, string and bool
values can be stored directly in the pointer addresses, vastly
reducing required heap memory
- Ability to create circular data structures such as
`let o; o = { test: o };`
- Ability to register custom `tostring()` function through prototypes
- Initial mark/sweep GC implementation to tear down circular object
graphs on VM deinit
The change also paves the way for possible future extensions such as
constant variables and meta methods for custom ressource types.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Signed-off-by: Petr Štetiar <ynezz@true.cz>
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