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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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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Optimize the strncmp() based token lookup with an integer comparison
approach which roughly cuts the time of the source code parsing phase
in half.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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Get rid of the distinction between lexer/parser errors and runtime
exceptions, use exceptions everywhere instead.
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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- Keep an open FILE* reference to processed source files in order to
be able to rewind and extract error context later
- Build a proper call stack when invoking utpl functions
- Report call stack in exceptions
Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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- unify operand and value tag structures
- use a contiguous array for storing opcodes
- use relative offsets for next and children ops
- defer function creation to runtime
- rework "this" context handling by storing context pointer in scope tags
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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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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Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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