Motiejus Jakštys
ff99a5157e
Port two missing features from upstream AstGen.zig ret() function: 1. Add any_defer_node field to GenZir (AstGen.zig:11812) to track whether we're inside a defer expression. Set it in defer body generation and propagate via makeSubBlock. retExpr now checks this field and errors with "cannot return from defer expression" (AstGen.zig:8127-8135). Also reorder retExpr checks to match upstream: fn_block null check first, then any_defer_node check, then emitDbgNode. 2. Add reachableExpr wrapper (AstGen.zig:408-416) that calls exprRl and checks refIsNoReturn to detect unreachable code. Use it in retExpr instead of plain exprRl for the return operand (AstGen.zig:8185-8186). nameStratExpr is left as TODO since containerDecl does not yet accept a name_strategy parameter. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
About
zig0 aspires to be an interpreter of zig 0.15.1 written in C.
This is written with help from LLM:
- Lexer:
- Datastructures 100% human.
- Helper functions 100% human.
- Lexing functions 50/50 human/bot.
- Parser:
- Datastructures 100% human.
- Helper functions 50/50.
- Parser functions 5/95 human/bot.
- AstGen: TBD.
Testing
Quick test:
zig build fmt test
Full test and static analysis with all supported compilers and valgrind (run before commit, takes a while):
zig build -Dvalgrind
Debugging tips
Test runs infinitely? Build the test program executable:
$ zig build test -Dno-exec
And then run it, capturing the stack trace:
gdb -batch \
-ex "python import threading; threading.Timer(1.0, lambda: gdb.post_event(lambda: gdb.execute('interrupt'))).start()" \
-ex run \
-ex "bt full" \
-ex quit \
zig-out/bin/test
You are welcome to replace -ex "bt full" with anything other of interest.