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Ensure that all custom typedef and vector declaration type names end with
a "_t" suffix.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Introduce support for declaring constant variables through the `const`
keyword. Variables declared with `const` follow the same scoping rules
as `let` declared ones.
In contrast to normal variables, `const` ones may not be assigned to
after their declaration. Any attempt to do so will result in a syntax
error during compilation.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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When emitting byte code for break or continue statements, ensure that local
variables in all containing scopes up to the loop body scope are popped,
not just those in the same scope the statement is located in.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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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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Replace the former AST walking interpreter implementation with a single pass
bytecode compiler and a corresponding virtual machine.
The rewrite lays the groundwork for a couple of improvements with will be
subsequently implemented:
- Ability to precompile ucode sources into binary byte code
- Strippable debug information
- Reduced runtime memory usage
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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