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astgen: switchExprErrUnion, decl_val rvalue, identAsString ordering

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Port switchExprErrUnion optimization for both catch and if patterns,
fix missing rvalue call in decl table lookup, fix identAsString
ordering for underscore error captures, and fill value_placeholder
with 0xaa to match upstream undefined pattern.

Enables corpus build.zig test.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Motiejus Jakštys
2026-02-14 09:54:28 +00:00
parent b2592f40be
commit 28ee5d40b7
2 changed files with 583 additions and 11 deletions
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20
stage0/astgen_test.zig
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@@ -243,7 +243,21 @@ fn expectEqualZir(gpa: Allocator, ref: Zir, got: c.Zir) !void {
const ref_datas = ref.instructions.items(.data);
// 1. Compare lengths.
try std.testing.expectEqual(ref_len, got.inst_len);
if (ref_len != got.inst_len) {
std.debug.print("inst_len mismatch: ref={d} got={d}\n", .{ ref_len, got.inst_len });
var ref_counts: [265]u32 = .{0} ** 265;
var got_counts: [265]u32 = .{0} ** 265;
for (0..ref_len) |i| ref_counts[@intFromEnum(ref_tags[i])] += 1;
for (0..got.inst_len) |i| got_counts[got.inst_tags[i]] += 1;
for (0..265) |t| {
if (ref_counts[t] != got_counts[t])
std.debug.print("tag {d}: ref={d} got={d} (diff={d})\n", .{
t, ref_counts[t], got_counts[t],
@as(i32, @intCast(got_counts[t])) - @as(i32, @intCast(ref_counts[t])),
});
}
return error.TestExpectedEqual;
}
// 2. Compare instruction tags.
for (0..ref_len) |i| {
@@ -793,10 +807,6 @@ test "astgen: corpus test_all.zig" {
}
test "astgen: corpus build.zig" {
// TODO: 6 extra instructions — missing switchExprErrUnion optimization
// (catch |err| switch(err) pattern emits SWITCH_BLOCK instead of
// SWITCH_BLOCK_ERR_UNION).
if (true) return error.SkipZigTest;
const gpa = std.testing.allocator;
try corpusCheck(gpa, @embedFile("../build.zig"));
}