Module import export support #96
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- Use nested switches instead of lookup tables to detect tokens - Simplify input buffer logic - Reduce amount of intermediate states Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Add support for the `import`, `export`, `from` and `as` keywords used in module import and export statements. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
The upcoming module import support requires constant object values to implement module wildcard import. Reuse the existing u64 bit in ucv heads to mark array or object values as constant and add corresponding `ucv_is_constant()` and `ucv_set_constant()` helpers. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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When stringifying upvalue references, resolve their target value and convert it to a string. Only yield the abstract string representation if the target value cannot be resolved. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Reject modifications on array values with a type exception when the constant flag is set on the array operated upon. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Extend abstract source objects to maintain a list of exported symbols and add functions to append and lookup exported names. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
The sizeof(size_t) might differ from the sizeof(uint32_t) used to serialize compiled bytecode, so extra care is needed to properly encode and decode upvalue slot values which are defined as (size_t)-1 / 2 + n. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
We must always report the chunk source position relative to the function start offset, even if it is zero. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
The upcoming module support requires maintaining multiple source objects within the same program, so add the necessary infrastructure for it. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Add a helper function to query the global index of a named export within a specific source which is a prerequisite for compiling import statements. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Upcoming module support will rely on upresolved upvalues which are patched at runtime to realize module imports, make sure the VM trace code does not choke on such unresolved upvalues. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Resolve upvalue references to their actual values when pushing such references onto the stack (or when attempting to call them as method). This allows constructing objects of pointers, as needed for wildcard module imports. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Reject modifications on object and array values with a type exception when the constant flag is set on the value operated upon. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Introduce new opcodes to realize module imports and exports. The export operation will capture a local variable as upvalue and store it in VM wide module export registry while the import operation will connect an upvalue from the module export registry with a preallocated upvalue in the running function scope. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
The upcoming compile-time module support will require the configured extension search path in the compiler as well, so move it to the already shared uc_parse_config_t structure and add the appropriate utility functions to initialize, append and free the search path vector. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Replace all occurrences for the test file directory path with "." in stderr and stdout results to ensure stable test outputs. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Report the proper source location when raising an error due to an increment/decrement operation on a constant value. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
So far we allowed anonymous toplevel function expressions which makes little sense since those can't be used for anything. Require toplevel function declarations to be named and turn a missing name into a compile time syntax error. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Do not require a parent function compiler reference to lookup an already declared (potentially unresolved) upvalue in the current scope. Instead, search the named upvalues in the current function scope in case there is no parent compiler reference. This is required for the upcoming module support which will use unresolved upvalues to realize import/export functionality. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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This commit introduces syntax level support for ES6 style module import and export statements. Imports are resolved at compile time and the corresponding module code is compiled into the main program. Also add testcases to cover import and export statement semantics. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
Trim down the libucode.so size somewhat by marking purely internal, non-public API functions hidden. Signed-off-by: Jo-Philipp Wich <jo@mein.io>
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This PR introdcues support for ES6 like import and export statements ("JavaScript modules") to allow resolving and compiling module code at compile time without having to resort to dynamic loading through
require()at runtime.