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033892777a
See issue #587. * Merge eval-ast and eval into a single conditional. * Expand macros during the apply phase, removing lots of duplicate tests, and increasing the overall consistency by allowing the macro to be computed instead of referenced by name (`((defmacro! cond (...)))` is currently illegal for example). * Print "EVAL: $ast" at the top of EVAL if DEBUG-EVAL exists in the MAL environment. * Remove macroexpand and quasiquoteexpand special forms. * Use pattern-matching style in process/step*.txt. Unresolved issues: c.2: unable to reproduce with gcc 11.12.0. elm: the directory is unchanged. groovy: sometimes fail, but not on each rebuild. nasm: fails some new soft tests, but the issue is unreproducible when running the interpreter manually. objpascal: unreproducible with fpc 3.2.2. ocaml: unreproducible with 4.11.1. perl6: unreproducible with rakudo 2021.09. Unrelated changes: Reduce diff betweens steps. Prevent defmacro! from mutating functions: c forth logo miniMAL vb. dart: fix recent errors and warnings ocaml: remove metadata from symbols. Improve the logo implementation. Encapsulate all representation in types.lg and env.lg, unwrap numbers. Replace some manual iterations with logo control structures. Reduce the diff between steps. Use native iteration in env_get and env_map Rewrite the reader with less temporary strings. Reduce the number of temporary lists (for example, reverse iteration with butlast requires O(n^2) allocations). It seems possible to remove a few exceptions: GC settings (Dockerfile), NO_SELF_HOSTING (IMPLS.yml) and step5_EXCLUDES (Makefile.impls) .
424 lines
13 KiB
VHDL
424 lines
13 KiB
VHDL
entity step7_quote is
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end entity step7_quote;
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library STD;
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use STD.textio.all;
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library WORK;
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use WORK.pkg_readline.all;
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use WORK.types.all;
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use WORK.printer.all;
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use WORK.reader.all;
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use WORK.env.all;
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use WORK.core.all;
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architecture test of step7_quote is
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shared variable repl_env: env_ptr;
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procedure mal_READ(str: in string; ast: out mal_val_ptr; err: out mal_val_ptr) is
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begin
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read_str(str, ast, err);
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end procedure mal_READ;
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procedure starts_with(lst : inout mal_val_ptr;
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sym : in string;
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res : out boolean) is
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begin
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res := lst.seq_val.all'length = 2
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and lst.seq_val.all (lst.seq_val.all'low).val_type = mal_symbol
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and lst.seq_val.all (lst.seq_val.all'low).string_val.all = sym;
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end starts_with;
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-- Forward declaration
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procedure quasiquote(ast: inout mal_val_ptr;
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result: out mal_val_ptr);
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procedure qq_loop(elt : inout mal_val_ptr;
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acc : inout mal_val_ptr) is
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variable sw : boolean := elt.val_type = mal_list;
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variable seq : mal_seq_ptr := new mal_seq(0 to 2);
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begin
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if sw then
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starts_with(elt, "splice-unquote", sw);
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end if;
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if sw then
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new_symbol("concat", seq(0));
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seq(1) := elt.seq_val(1);
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else
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new_symbol("cons", seq(0));
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quasiquote(elt, seq(1));
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end if;
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seq(2) := acc;
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new_seq_obj(mal_list, seq, acc);
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end qq_loop;
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procedure qq_foldr (xs : inout mal_seq_ptr;
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res : out mal_val_ptr) is
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variable seq : mal_seq_ptr := new mal_seq(0 to -1);
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variable acc : mal_val_ptr;
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begin
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new_seq_obj(mal_list, seq, acc);
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for i in xs'reverse_range loop
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qq_loop (xs(i), acc);
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end loop;
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res := acc;
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end procedure qq_foldr;
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procedure quasiquote(ast: inout mal_val_ptr;
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result: out mal_val_ptr) is
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variable sw : boolean;
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variable seq : mal_seq_ptr;
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begin
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case ast.val_type is
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when mal_list =>
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starts_with(ast, "unquote", sw);
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if sw then
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result := ast.seq_val(1);
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else
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qq_foldr(ast.seq_val, result);
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end if;
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when mal_vector =>
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seq := new mal_seq(0 to 1);
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new_symbol("vec", seq(0));
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qq_foldr(ast.seq_val, seq(1));
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new_seq_obj(mal_list, seq, result);
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when mal_symbol | mal_hashmap =>
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seq := new mal_seq(0 to 1);
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new_symbol("quote", seq(0));
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seq(1) := ast;
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new_seq_obj(mal_list, seq, result);
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when others =>
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result := ast;
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end case;
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end procedure quasiquote;
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-- Forward declaration
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procedure EVAL(in_ast: inout mal_val_ptr; in_env: inout env_ptr; result: out mal_val_ptr; err: out mal_val_ptr);
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procedure apply_func(fn: inout mal_val_ptr; args: inout mal_val_ptr; result: out mal_val_ptr; err: out mal_val_ptr);
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procedure fn_eval(args: inout mal_val_ptr; result: out mal_val_ptr; err: out mal_val_ptr) is
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begin
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EVAL(args.seq_val(0), repl_env, result, err);
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end procedure fn_eval;
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procedure fn_swap(args: inout mal_val_ptr; result: out mal_val_ptr; err: out mal_val_ptr) is
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variable atom: mal_val_ptr := args.seq_val(0);
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variable fn: mal_val_ptr := args.seq_val(1);
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variable call_args_seq: mal_seq_ptr;
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variable call_args, eval_res, sub_err: mal_val_ptr;
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begin
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call_args_seq := new mal_seq(0 to args.seq_val'length - 2);
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call_args_seq(0) := atom.seq_val(0);
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call_args_seq(1 to call_args_seq'length - 1) := args.seq_val(2 to args.seq_val'length - 1);
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new_seq_obj(mal_list, call_args_seq, call_args);
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apply_func(fn, call_args, eval_res, sub_err);
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if sub_err /= null then
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err := sub_err;
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return;
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end if;
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atom.seq_val(0) := eval_res;
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result := eval_res;
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end procedure fn_swap;
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procedure apply_native_func(func_sym: inout mal_val_ptr; args: inout mal_val_ptr; result: out mal_val_ptr; err: out mal_val_ptr) is
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begin
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if func_sym.string_val.all = "eval" then
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fn_eval(args, result, err);
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elsif func_sym.string_val.all = "swap!" then
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fn_swap(args, result, err);
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else
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eval_native_func(func_sym, args, result, err);
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end if;
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end procedure apply_native_func;
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procedure apply_func(fn: inout mal_val_ptr; args: inout mal_val_ptr; result: out mal_val_ptr; err: out mal_val_ptr) is
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variable fn_env: env_ptr;
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begin
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case fn.val_type is
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when mal_nativefn =>
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apply_native_func(fn, args, result, err);
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when mal_fn =>
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new_env(fn_env, fn.func_val.f_env, fn.func_val.f_args, args);
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EVAL(fn.func_val.f_body, fn_env, result, err);
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when others =>
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new_string("not a function", err);
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return;
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end case;
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end procedure apply_func;
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procedure eval_ast_seq(ast_seq : inout mal_seq_ptr;
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skip : in natural;
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env : inout env_ptr;
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result : inout mal_seq_ptr;
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err : out mal_val_ptr) is
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variable eval_err: mal_val_ptr;
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begin
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result := new mal_seq(0 to ast_seq'length - 1 - skip);
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for i in result'range loop
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EVAL(ast_seq(skip + i), env, result(i), eval_err);
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if eval_err /= null then
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err := eval_err;
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return;
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end if;
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end loop;
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end procedure eval_ast_seq;
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procedure EVAL(in_ast : inout mal_val_ptr;
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in_env : inout env_ptr;
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result : out mal_val_ptr;
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err : out mal_val_ptr) is
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variable val, eval_err, a0, call_args, vars, fn, sub_err: mal_val_ptr;
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variable ast : mal_val_ptr := in_ast;
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variable env : env_ptr := in_env;
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variable let_env, fn_env : env_ptr;
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variable s: line;
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variable new_seq: mal_seq_ptr;
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variable i: integer;
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begin
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loop
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new_symbol("DEBUG-EVAL", a0);
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env_get(env, a0, val);
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if val /= null and val.val_type /= mal_nil and val.val_type /= mal_false
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then
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mal_printstr("EVAL: ");
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pr_str(ast, true, s);
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mal_printline(s.all);
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end if;
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case ast.val_type is
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when mal_symbol =>
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env_get(env, ast, val);
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if val = null then
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new_string("'" & ast.string_val.all & "' not found", err);
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return;
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end if;
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result := val;
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return;
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when mal_list =>
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null;
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when mal_vector | mal_hashmap =>
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eval_ast_seq(ast.seq_val, 0, env, new_seq, eval_err);
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if eval_err /= null then
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err := eval_err;
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return;
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end if;
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new_seq_obj(ast.val_type, new_seq, result);
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return;
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when others =>
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result := ast;
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return;
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end case;
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if ast.seq_val'length = 0 then
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result := ast;
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return;
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end if;
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a0 := ast.seq_val(0);
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if a0.val_type = mal_symbol then
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if a0.string_val.all = "def!" then
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EVAL(ast.seq_val(2), env, val, sub_err);
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if sub_err /= null then
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err := sub_err;
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return;
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end if;
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env_set(env, ast.seq_val(1), val);
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result := val;
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return;
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elsif a0.string_val.all = "let*" then
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vars := ast.seq_val(1);
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new_env(let_env, env);
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i := 0;
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while i < vars.seq_val'length loop
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EVAL(vars.seq_val(i + 1), let_env, val, sub_err);
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if sub_err /= null then
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err := sub_err;
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return;
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end if;
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env_set(let_env, vars.seq_val(i), val);
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i := i + 2;
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end loop;
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env := let_env;
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ast := ast.seq_val(2);
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next; -- TCO
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elsif a0.string_val.all = "quote" then
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result := ast.seq_val(1);
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return;
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elsif a0.string_val.all = "quasiquote" then
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quasiquote(ast.seq_val(1), ast);
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next; -- TCO
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elsif a0.string_val.all = "do" then
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for i in 1 to ast.seq_val'high - 1 loop
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EVAL(ast.seq_val(i), env, result, sub_err);
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if sub_err /= null then
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err := sub_err;
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return;
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end if;
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end loop;
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ast := ast.seq_val(ast.seq_val'high);
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next; -- TCO
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elsif a0.string_val.all = "if" then
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EVAL(ast.seq_val(1), env, val, sub_err);
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if sub_err /= null then
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err := sub_err;
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return;
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end if;
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if val.val_type = mal_nil or val.val_type = mal_false then
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if ast.seq_val'length > 3 then
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ast := ast.seq_val(3);
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else
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new_nil(result);
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return;
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end if;
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else
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ast := ast.seq_val(2);
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end if;
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next; -- TCO
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elsif a0.string_val.all = "fn*" then
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new_fn(ast.seq_val(2), ast.seq_val(1), env, result);
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return;
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end if;
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end if;
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EVAL (a0, env, fn, sub_err);
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if sub_err /= null then
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err := sub_err;
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return;
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end if;
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-- Evaluate arguments
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eval_ast_seq(ast.seq_val, 1, env, new_seq, sub_err);
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if sub_err /= null then
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err := sub_err;
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return;
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end if;
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new_seq_obj(mal_list, new_seq, call_args);
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-- Special-case functions for TCO
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if fn.val_type = mal_fn then
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new_env(fn_env, fn.func_val.f_env, fn.func_val.f_args, call_args);
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env := fn_env;
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ast := fn.func_val.f_body;
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next; -- TCO
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end if;
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apply_func(fn, call_args, result, err);
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return;
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end loop;
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end procedure EVAL;
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procedure mal_PRINT(exp: inout mal_val_ptr; result: out line) is
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begin
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pr_str(exp, true, result);
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end procedure mal_PRINT;
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procedure RE(str: in string; env: inout env_ptr; result: out mal_val_ptr; err: out mal_val_ptr) is
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variable ast, read_err: mal_val_ptr;
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begin
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mal_READ(str, ast, read_err);
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if read_err /= null then
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err := read_err;
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result := null;
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return;
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end if;
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if ast = null then
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result := null;
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return;
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end if;
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EVAL(ast, env, result, err);
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end procedure RE;
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procedure REP(str: in string; env: inout env_ptr; result: out line; err: out mal_val_ptr) is
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variable eval_res, eval_err: mal_val_ptr;
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begin
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RE(str, env, eval_res, eval_err);
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if eval_err /= null then
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err := eval_err;
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result := null;
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return;
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end if;
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mal_PRINT(eval_res, result);
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end procedure REP;
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procedure set_argv(e: inout env_ptr; program_file: inout line) is
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variable argv_var_name: string(1 to 6) := "*ARGV*";
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variable argv_sym, argv_list: mal_val_ptr;
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file f: text;
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variable status: file_open_status;
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variable one_line: line;
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variable seq: mal_seq_ptr;
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variable element: mal_val_ptr;
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begin
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program_file := null;
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seq := new mal_seq(0 to -1);
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file_open(status, f, external_name => "vhdl_argv.tmp", open_kind => read_mode);
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if status = open_ok then
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if not endfile(f) then
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readline(f, program_file);
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while not endfile(f) loop
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readline(f, one_line);
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new_string(one_line.all, element);
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seq := new mal_seq'(seq.all & element);
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end loop;
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end if;
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file_close(f);
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end if;
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new_seq_obj(mal_list, seq, argv_list);
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new_symbol(argv_var_name, argv_sym);
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env_set(e, argv_sym, argv_list);
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end procedure set_argv;
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procedure repl is
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variable is_eof: boolean;
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variable program_file, input_line, result: line;
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variable eval_sym, eval_fn, dummy_val, err: mal_val_ptr;
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variable outer: env_ptr;
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variable eval_func_name: string(1 to 4) := "eval";
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begin
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outer := null;
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new_env(repl_env, outer);
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-- core.EXT: defined using VHDL (see core.vhdl)
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define_core_functions(repl_env);
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new_symbol(eval_func_name, eval_sym);
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new_nativefn(eval_func_name, eval_fn);
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env_set(repl_env, eval_sym, eval_fn);
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set_argv(repl_env, program_file);
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-- core.mal: defined using the language itself
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RE("(def! not (fn* (a) (if a false true)))", repl_env, dummy_val, err);
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RE("(def! load-file (fn* (f) (eval (read-string (str " & '"' & "(do " & '"' & " (slurp f) " & '"' & "\nnil)" & '"' & ")))))", repl_env, dummy_val, err);
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if program_file /= null then
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REP("(load-file " & '"' & program_file.all & '"' & ")", repl_env, result, err);
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return;
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end if;
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loop
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mal_readline("user> ", is_eof, input_line);
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exit when is_eof;
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next when input_line'length = 0;
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REP(input_line.all, repl_env, result, err);
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if err /= null then
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pr_str(err, false, result);
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result := new string'("Error: " & result.all);
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end if;
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if result /= null then
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mal_printline(result.all);
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end if;
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deallocate(result);
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deallocate(err);
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end loop;
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mal_printline("");
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end procedure repl;
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begin
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repl;
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end architecture test;
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