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stage2: more debuggable panics

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For now these errors are handled via `@panic` rather than `unreachable`.
These are relatively likely bugs to occur at this early stage of
development, and handling them as panics lets us ship release builds
of the compiler without worrying about undefined behavior.

Furthermore, in stage1, `@panic` is implemented to include an error
return trace, while `unreachable` is not. In this case, the error return
traces are extremely helpful in debugging the compiler.
This commit is contained in:
Andrew Kelley 2021-08-05 23:20:53 -07:00
parent 786e238a7f
commit c7dc451a2a
1 changed files with 2 additions and 2 deletions
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4
src/Module.zig
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@ -3792,8 +3792,8 @@ pub fn analyzeFnBody(mod: *Module, decl: *Decl, func: *Fn) SemaError!Air {
log.debug("set {s} to in_progress", .{decl.name}); log.debug("set {s} to in_progress", .{decl.name});
_ = sema.analyzeBody(&inner_block, fn_info.body) catch |err| switch (err) { _ = sema.analyzeBody(&inner_block, fn_info.body) catch |err| switch (err) {
error.NeededSourceLocation => unreachable, error.NeededSourceLocation => @panic("zig compiler bug: NeededSourceLocation"),
error.GenericPoison => unreachable, error.GenericPoison => @panic("zig compiler bug: GenericPoison"),
else => |e| return e, else => |e| return e,
}; };