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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) .
254 lines
7.0 KiB
VHDL
254 lines
7.0 KiB
VHDL
entity step5_tco is
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end entity step5_tco;
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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 step5_tco is
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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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-- 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 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 = "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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case fn.val_type is
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when mal_nativefn =>
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eval_native_func(fn, call_args, result, err);
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return;
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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, 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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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 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 repl is
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variable is_eof: boolean;
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variable input_line, result: line;
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variable dummy_val, err: mal_val_ptr;
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variable outer, repl_env: env_ptr;
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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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-- 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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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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