The wrenMarkObj function already handles null pointers internally, making the explicit
`if (x != NULL)` guards unnecessary. This change removes three such checks in
wrenMarkCompiler, markFn, and collectGarbage, simplifying the code without changing
behavior.
The super() call resolution is changed from dynamic runtime lookup (walking the receiver's class hierarchy) to static binding at class definition time. This ensures correct method dispatch when a method containing a super call is inherited by another subclass.
Key changes:
- In `callSignature()`, when compiling a `CODE_SUPER_0` instruction, a constant slot is created and filled with NULL, to be populated with the superclass reference when the method is bound.
- In `getNumArguments()`, the `CODE_SUPER_0` through `CODE_SUPER_16` cases are moved after the newly added 2-argument opcodes (`CODE_JUMP`, `CODE_LOOP`, etc.) to maintain correct ordering.
- In `dumpInstruction()`, the debug output now prints the superclass constant index alongside the method symbol.
- In `runInterpreter()`, the super call execution reads the superclass directly from the function's constant table instead of deriving it from the receiver's class at runtime.
Replace the loop-based single-element writes in readUnicodeEscape and wrenBindMethod with a new BufferFill macro that grows the buffer by a specified count in one allocation. The macro doubles capacity until it fits the requested count, then fills the new slots with the given data. The existing BufferWrite is reimplemented as a call to BufferFill with count=1.
When a compile error occurs, the compiler's code is freed but the parent compiler
was not restored as the active compiler. This could cause the garbage collector
to operate on a dangling compiler pointer if a collection happens after the error.
The fix calls wrenSetCompiler to restore the parent compiler before freeing,
ensuring the GC always sees a valid compiler state.
The return value of finishBlock() was inverted so that it now returns true
for expression bodies (value left on stack) and false for statement bodies
(no value left). All internal return points and the call site in finishBody()
were updated accordingly to maintain correct code generation behavior.
Add `byteAt(index)`, `codePointAt(index)`, and `bytes` sequence to String,
enabling direct byte-level manipulation of UTF-8 encoded strings. Introduce
`\x` hex escape sequence in string literals for specifying raw byte values.
Refactor Unicode escape parsing into a generic `readHexEscape` function
supporting variable digit counts. Implement `wrenUtf8Decode` utility for
decoding UTF-8 sequences from byte buffers. Add comprehensive tests for
`byteAt` including boundary conditions and error cases.
Implement the `String.fromCodePoint(_)` primitive that creates a string from a Unicode code point, with validation for integer range 0–0x10ffff. Extract inline UTF-8 encoding logic from `readUnicodeEscape` in the compiler into new `wrenUtf8NumBytes` and `wrenUtf8Encode` utility functions in `wren_utils`, and add `wrenStringFromCodePoint` helper in `wren_value`. Update documentation for core classes to add "Methods" and "Static Methods" section headers, and include `String.fromCodePoint` docs with example. Add a test file `from_code_point.wren` covering various code points.
Implement the `WrenBindForeignMethodFn` callback type and `bindForeignMethodFn` configuration field to allow host applications to resolve foreign method declarations at class definition time. Refactor the IO library to use this new binding mechanism instead of the previous `wrenDefineStaticMethod` approach, adding `foreign` keyword support to the lexer and compiler. Introduce `freeCompiler` helper for cleanup, store module names in `ObjModule`, and update the VM to call the binder when processing `CODE_METHOD_INSTANCE` and `CODE_METHOD_STATIC` opcodes for foreign methods.
Remove the `WrenVM* vm` parameter from `wrenValueBufferInit`, `wrenByteBufferInit`,
`wrenIntBufferInit`, `wrenStringBufferInit`, `wrenSymbolTableInit`,
`wrenMethodBufferInit`, `wrenStringFind`, and `wrenDebugPrintStackTrace`
functions across the compiler, core, debug, utils, value, and VM modules.
Update all call sites and macro definitions to match the simplified signatures,
eliminating dead parameters that were never used within the function bodies.
Replace the hand-rolled capacity/count/elements fields in ObjList with a
ValueBuffer struct, and update Compiler to use a ValueBuffer for its
constant pool instead of an ObjList. This eliminates the separate
ensureListCapacity and wrenListAdd functions, centralizing buffer growth
logic in wrenValueBufferWrite. Adjust all list primitives (add, clear,
count, iterate, iteratorValue) and the GC marking path to operate on the
embedded ValueBuffer. Add wrenMarkBuffer helper for marking buffer
contents during sweep.
Add CLANG_WARN_SUSPICIOUS_IMPLICIT_CONVERSION = YES to both Debug and Release Xcode build configurations. Fix the resulting warnings by adding explicit casts in wren_compiler.c (readUnicodeEscape, emit, emitShort, emitByteArg) and wren_vm.c (READ_SHORT macro, makeCallStub bytecode assignment) to prevent unintended truncation or sign extension during implicit integer conversions.
Replace ad-hoc string construction using wrenNewString, wrenStringConcat, and sprintf with the new wrenStringFormat helper. This centralizes string formatting logic, reduces code duplication, and eliminates manual length calculations in wren_compiler.c, wren_core.c, wren_value.c, and wren_vm.c. Also introduces CONST_STRING macro for compile-time string literals and changes wrenNewUninitializedString return type from Value to ObjString* for consistency.
Separate Wren VM library sources from CLI tool sources by moving them into
src/vm/ and src/cli/ subdirectories respectively. Update the Makefile to use
separate wildcard patterns for each directory, generate distinct object file
paths under build/vm/ and build/cli/, and adjust include paths to src/include.
Also update the Xcode project file to reference the new file locations.
