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AstGen: implement for loop payload

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This commit is contained in:
Andrew Kelley 2021-04-20 17:52:35 -07:00
parent 30c9808391
commit e9477048e5
1 changed files with 16 additions and 3 deletions
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19
src/AstGen.zig
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@ -4263,6 +4263,7 @@ fn forExpr(
};
defer then_scope.instructions.deinit(astgen.gpa);
var payload_val_scope: Scope.LocalVal = undefined;
var index_scope: Scope.LocalPtr = undefined;
const then_sub_scope = blk: {
const payload_token = for_full.payload_token.?;
@ -4272,22 +4273,34 @@ fn forExpr(
payload_token;
const is_ptr = ident != payload_token;
const value_name = tree.tokenSlice(ident);
var payload_sub_scope: *Scope = undefined;
if (!mem.eql(u8, value_name, "_")) {
return astgen.failTok(ident, "TODO implement for loop value payload", .{});
const tag: Zir.Inst.Tag = if (is_ptr) .elem_ptr else .elem_val;
const payload_inst = try then_scope.addBin(tag, array_ptr, index);
payload_val_scope = .{
.parent = &then_scope.base,
.gen_zir = &then_scope,
.name = value_name,
.inst = payload_inst,
.token_src = ident,
};
payload_sub_scope = &payload_val_scope.base;
} else if (is_ptr) {
return astgen.failTok(payload_token, "pointer modifier invalid on discard", .{});
} else {
payload_sub_scope = &then_scope.base;
}
const index_token = if (token_tags[ident + 1] == .comma)
ident + 2
else
break :blk &then_scope.base;
break :blk payload_sub_scope;
if (mem.eql(u8, tree.tokenSlice(index_token), "_")) {
return astgen.failTok(index_token, "discard of index capture; omit it instead", .{});
}
const index_name = try astgen.identifierTokenString(index_token);
index_scope = .{
.parent = &then_scope.base,
.parent = payload_sub_scope,
.gen_zir = &then_scope,
.name = index_name,
.ptr = index_ptr,