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Improve logic for diverging procedures by checking if it terminates

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This commit is contained in:
gingerBill
2021-06-16 12:07:24 +01:00
parent 8f57bb0799
commit 41f2539484
3 changed files with 31 additions and 11 deletions
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11
src/check_decl.cpp
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@@ -1297,13 +1297,21 @@ void check_proc_body(CheckerContext *ctx_, Token token, DeclInfo *decl, Type *ty
error(bs->close, "Missing return statement at the end of the procedure");
}
}
} else if (type->Proc.diverging) {
if (!check_is_terminating(body, str_lit(""))) {
if (token.kind == Token_Ident) {
error(bs->close, "Missing diverging call at the end of the procedure '%.*s'", LIT(token.string));
} else {
// NOTE(bill): Anonymous procedure (lambda)
error(bs->close, "Missing diverging call at the end of the procedure");
}
}
}
}
check_close_scope(ctx);
check_scope_usage(ctx->checker, ctx->scope);
#if 1
if (decl->parent != nullptr) {
Scope *ps = decl->parent->scope;
if (ps->flags & (ScopeFlag_File & ScopeFlag_Pkg & ScopeFlag_Global)) {
@@ -1321,7 +1329,6 @@ void check_proc_body(CheckerContext *ctx_, Token token, DeclInfo *decl, Type *ty
}
}
}
#endif
}

23
src/check_stmt.cpp
View File

@@ -247,11 +247,24 @@ bool check_is_terminating(Ast *node, String const &label) {
case_ast_node(ws, WhenStmt, node);
// TODO(bill): Is this logic correct for when statements?
if (ws->else_stmt != nullptr) {
if (check_is_terminating(ws->body, label) &&
check_is_terminating(ws->else_stmt, label)) {
return true;
}
auto const &tv = ws->cond->tav;
if (tv.mode != Addressing_Constant) {
// NOTE(bill): Check the things regardless as a bug occurred earlier
if (ws->else_stmt != nullptr) {
if (check_is_terminating(ws->body, label) &&
check_is_terminating(ws->else_stmt, label)) {
return true;
}
}
return false;
}
if (tv.value.kind == ExactValue_Bool) {
if (tv.value.value_bool) {
return check_is_terminating(ws->body, label);
} else {
return check_is_terminating(ws->else_stmt, label);
}
}
case_end;