Remove the environment concept from front::eval
This is the old method of conditional compilation. It is going away. Issue #489
This commit is contained in:
parent
70a28dc238
commit
bca45720f7
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@ -6,6 +6,7 @@ import front::parser;
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import front::token;
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import front::eval;
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import front::ast;
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import front::attr;
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import middle::trans;
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import middle::resolve;
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import middle::ty;
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@ -35,8 +36,8 @@ import back::link::output_type;
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tag pp_mode { ppm_normal; ppm_typed; ppm_identified; }
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fn default_environment(session::session sess, str argv0, str input) ->
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eval::env {
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fn default_configuration(session::session sess, str argv0, str input) ->
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ast::crate_cfg {
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auto libc =
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alt (sess.get_targ_cfg().os) {
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case (session::os_win32) { "msvcrt.dll" }
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@ -44,13 +45,16 @@ fn default_environment(session::session sess, str argv0, str input) ->
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case (session::os_linux) { "libc.so.6" }
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case (_) { "libc.so" }
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};
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auto mk = attr::mk_name_value_item;
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ret [ // Target bindings.
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tup("target_os", eval::val_str(std::os::target_os())),
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tup("target_arch", eval::val_str("x86")),
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tup("target_libc", eval::val_str(libc)),
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mk("target_os", std::os::target_os()),
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mk("target_arch", "x86"),
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mk("target_libc", libc),
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// Build bindings.
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tup("build_compiler", eval::val_str(argv0)),
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tup("build_input", eval::val_str(input))];
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mk("build_compiler", argv0),
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mk("build_input", input)];
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}
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fn parse_input(session::session sess, parser::parser p, str input) ->
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@ -73,10 +77,10 @@ fn time[T](bool do_it, str what, fn() -> T thunk) -> T {
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ret rv;
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}
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fn compile_input(session::session sess, eval::env env, str input,
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fn compile_input(session::session sess, ast::crate_cfg cfg, str input,
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str output) {
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auto time_passes = sess.get_opts().time_passes;
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auto p = parser::new_parser(sess, env, input, 0u, 0);
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auto p = parser::new_parser(sess, cfg, input, 0u, 0);
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auto crate =
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time(time_passes, "parsing", bind parse_input(sess, p, input));
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if (sess.get_opts().output_type == link::output_type_none) { ret; }
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@ -104,9 +108,9 @@ fn compile_input(session::session sess, eval::env env, str input,
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bind link::write::run_passes(sess, llmod, output));
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}
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fn pretty_print_input(session::session sess, eval::env env, str input,
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pp_mode ppm) {
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auto p = front::parser::new_parser(sess, env, input, 0u, 0);
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fn pretty_print_input(session::session sess, ast::crate_cfg cfg,
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str input, pp_mode ppm) {
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auto p = front::parser::new_parser(sess, cfg, input, 0u, 0);
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auto crate = parse_input(sess, p, input);
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auto mode;
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alt (ppm) {
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@ -337,7 +341,7 @@ fn main(vec[str] args) {
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}
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auto ifile = match.free.(0);
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let str saved_out_filename = "";
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auto env = default_environment(sess, binary, ifile);
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auto cfg = default_configuration(sess, binary, ifile);
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auto pretty =
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option::map[str,
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pp_mode](bind parse_pretty(sess, _),
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@ -345,7 +349,7 @@ fn main(vec[str] args) {
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auto ls = opt_present(match, "ls");
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alt (pretty) {
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case (some[pp_mode](?ppm)) {
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pretty_print_input(sess, env, ifile, ppm);
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pretty_print_input(sess, cfg, ifile, ppm);
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ret;
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}
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case (none[pp_mode]) {/* continue */ }
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@ -371,7 +375,7 @@ fn main(vec[str] args) {
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case (link::output_type_exe) { parts += ["o"]; }
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}
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auto ofile = str::connect(parts, ".");
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compile_input(sess, env, ifile, ofile);
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compile_input(sess, cfg, ifile, ofile);
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}
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case (some(?ofile)) {
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// FIXME: what about windows? This will create a foo.exe.o.
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@ -386,7 +390,7 @@ fn main(vec[str] args) {
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}
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case (_) { temp_filename = ofile; }
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}
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compile_input(sess, env, ifile, temp_filename);
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compile_input(sess, cfg, ifile, temp_filename);
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}
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}
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@ -23,17 +23,14 @@ tag val { val_bool(bool); val_int(int); val_str(str); }
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tag eval_mode { mode_depend; mode_parse; }
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type env = vec[tup(ident, val)];
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type ctx =
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@rec(parser p,
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eval_mode mode,
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mutable vec[str] deps,
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session::session sess,
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mutable uint chpos,
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mutable int next_id);
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fn mk_env() -> env { ret []; }
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mutable int next_id,
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ast::crate_cfg cfg);
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fn val_is_bool(val v) -> bool {
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alt (v) { case (val_bool(_)) { true } case (_) { false } }
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@ -59,13 +56,6 @@ fn val_as_str(val v) -> str {
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alt (v) { case (val_str(?s)) { s } case (_) { fail } }
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}
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fn lookup(session::session sess, env e, span sp, ident i) -> val {
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for (tup(ident, val) pair in e) {
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if (str::eq(i, pair._0)) { ret pair._1; }
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}
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sess.span_fatal(sp, "unknown variable: " + i)
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}
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fn eval_lit(ctx cx, span sp, @ast::lit lit) -> val {
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alt (lit.node) {
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case (ast::lit_bool(?b)) { val_bool(b) }
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@ -75,18 +65,14 @@ fn eval_lit(ctx cx, span sp, @ast::lit lit) -> val {
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}
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}
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fn eval_expr(ctx cx, env e, @ast::expr x) -> val {
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fn eval_expr(ctx cx, @ast::expr x) -> val {
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alt (x.node) {
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case (ast::expr_path(?pth)) {
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if (vec::len[ident](pth.node.idents) == 1u &&
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vec::len[@ast::ty](pth.node.types) == 0u) {
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ret lookup(cx.sess, e, x.span, pth.node.idents.(0));
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}
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cx.sess.span_fatal(x.span, "evaluating structured path-name");
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}
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case (ast::expr_lit(?lit)) { ret eval_lit(cx, x.span, lit); }
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case (ast::expr_unary(?op, ?a)) {
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auto av = eval_expr(cx, e, a);
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auto av = eval_expr(cx, a);
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alt (op) {
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case (ast::not) {
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if (val_is_bool(av)) { ret val_bool(!val_as_bool(av)); }
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@ -98,8 +84,8 @@ fn eval_expr(ctx cx, env e, @ast::expr x) -> val {
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}
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}
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case (ast::expr_binary(?op, ?a, ?b)) {
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auto av = eval_expr(cx, e, a);
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auto bv = eval_expr(cx, e, b);
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auto av = eval_expr(cx, a);
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auto bv = eval_expr(cx, b);
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alt (op) {
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case (ast::add) {
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if (val_is_int(av) && val_is_int(bv)) {
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@ -177,30 +163,30 @@ fn val_eq(session::session sess, span sp, val av, val bv) -> bool {
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} else { sess.span_fatal(sp, "bad types in comparison") }
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}
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fn eval_crate_directives(ctx cx, env e, vec[@ast::crate_directive] cdirs,
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fn eval_crate_directives(ctx cx, vec[@ast::crate_directive] cdirs,
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str prefix, &mutable vec[@ast::view_item] view_items,
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&mutable vec[@ast::item] items) {
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for (@ast::crate_directive sub_cdir in cdirs) {
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eval_crate_directive(cx, e, sub_cdir, prefix, view_items, items);
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eval_crate_directive(cx, sub_cdir, prefix, view_items, items);
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}
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}
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fn eval_crate_directives_to_mod(ctx cx, env e,
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fn eval_crate_directives_to_mod(ctx cx,
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vec[@ast::crate_directive] cdirs, str prefix)
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-> ast::_mod {
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let vec[@ast::view_item] view_items = [];
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let vec[@ast::item] items = [];
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eval_crate_directives(cx, e, cdirs, prefix, view_items, items);
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eval_crate_directives(cx, cdirs, prefix, view_items, items);
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ret rec(view_items=view_items, items=items);
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}
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fn eval_crate_directive_block(ctx cx, env e, &ast::block blk, str prefix,
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fn eval_crate_directive_block(ctx cx, &ast::block blk, str prefix,
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&mutable vec[@ast::view_item] view_items,
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&mutable vec[@ast::item] items) {
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for (@ast::stmt s in blk.node.stmts) {
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alt (s.node) {
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case (ast::stmt_crate_directive(?cdir)) {
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eval_crate_directive(cx, e, cdir, prefix, view_items, items);
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eval_crate_directive(cx, cdir, prefix, view_items, items);
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}
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case (_) {
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cx.sess.span_fatal(s.span,
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@ -210,22 +196,22 @@ fn eval_crate_directive_block(ctx cx, env e, &ast::block blk, str prefix,
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}
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}
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fn eval_crate_directive_expr(ctx cx, env e, @ast::expr x, str prefix,
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fn eval_crate_directive_expr(ctx cx, @ast::expr x, str prefix,
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&mutable vec[@ast::view_item] view_items,
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&mutable vec[@ast::item] items) {
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alt (x.node) {
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case (ast::expr_if(?cond, ?thn, ?elopt)) {
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auto cv = eval_expr(cx, e, cond);
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auto cv = eval_expr(cx, cond);
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if (!val_is_bool(cv)) {
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cx.sess.span_fatal(x.span, "bad cond type in 'if'");
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}
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if (val_as_bool(cv)) {
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ret eval_crate_directive_block(cx, e, thn, prefix, view_items,
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ret eval_crate_directive_block(cx, thn, prefix, view_items,
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items);
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}
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alt (elopt) {
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case (some(?els)) {
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ret eval_crate_directive_expr(cx, e, els, prefix,
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ret eval_crate_directive_expr(cx, els, prefix,
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view_items, items);
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}
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case (_) {
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@ -235,19 +221,19 @@ fn eval_crate_directive_expr(ctx cx, env e, @ast::expr x, str prefix,
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}
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}
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case (ast::expr_alt(?v, ?arms)) {
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auto vv = eval_expr(cx, e, v);
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auto vv = eval_expr(cx, v);
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for (ast::arm arm in arms) {
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alt (arm.pat.node) {
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case (ast::pat_lit(?lit, _)) {
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auto pv = eval_lit(cx, arm.pat.span, lit);
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if (val_eq(cx.sess, arm.pat.span, vv, pv)) {
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ret eval_crate_directive_block(cx, e, arm.block,
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ret eval_crate_directive_block(cx, arm.block,
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prefix, view_items,
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items);
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}
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}
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case (ast::pat_wild(_)) {
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ret eval_crate_directive_block(cx, e, arm.block,
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ret eval_crate_directive_block(cx, arm.block,
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prefix, view_items,
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items);
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}
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@ -260,24 +246,23 @@ fn eval_crate_directive_expr(ctx cx, env e, @ast::expr x, str prefix,
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cx.sess.span_fatal(x.span, "no cases matched in 'alt'");
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}
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case (ast::expr_block(?block)) {
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ret eval_crate_directive_block(cx, e, block, prefix, view_items,
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ret eval_crate_directive_block(cx, block, prefix, view_items,
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items);
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}
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case (_) { cx.sess.span_fatal(x.span, "unsupported expr type"); }
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}
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}
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fn eval_crate_directive(ctx cx, env e, @ast::crate_directive cdir, str prefix,
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fn eval_crate_directive(ctx cx, @ast::crate_directive cdir, str prefix,
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&mutable vec[@ast::view_item] view_items,
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&mutable vec[@ast::item] items) {
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alt (cdir.node) {
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case (ast::cdir_let(?id, ?x, ?cdirs)) {
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auto v = eval_expr(cx, e, x);
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auto e0 = [tup(id, v)] + e;
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eval_crate_directives(cx, e0, cdirs, prefix, view_items, items);
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auto v = eval_expr(cx, x);
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eval_crate_directives(cx, cdirs, prefix, view_items, items);
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}
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case (ast::cdir_expr(?x)) {
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eval_crate_directive_expr(cx, e, x, prefix, view_items, items);
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eval_crate_directive_expr(cx, x, prefix, view_items, items);
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}
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case (ast::cdir_src_mod(?id, ?file_opt, ?attrs)) {
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auto file_path = id + ".rs";
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@ -292,7 +277,7 @@ fn eval_crate_directive(ctx cx, env e, @ast::crate_directive cdir, str prefix,
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};
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if (cx.mode == mode_depend) { cx.deps += [full_path]; ret; }
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auto p0 =
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new_parser(cx.sess, e, full_path, cx.chpos,
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new_parser(cx.sess, cx.cfg, full_path, cx.chpos,
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cx.next_id);
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auto inner_attrs = parse_inner_attrs_and_next(p0);
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auto mod_attrs = attrs + inner_attrs._0;
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@ -315,7 +300,7 @@ fn eval_crate_directive(ctx cx, env e, @ast::crate_directive cdir, str prefix,
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} else {
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prefix + std::fs::path_sep() + path
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};
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auto m0 = eval_crate_directives_to_mod(cx, e, cdirs, full_path);
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auto m0 = eval_crate_directives_to_mod(cx, cdirs, full_path);
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auto i = @rec(ident=id,
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attrs=attrs,
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id=cx.next_id,
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@ -32,7 +32,6 @@ type parser =
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fn restrict(restriction) ;
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fn get_restriction() -> restriction ;
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fn get_file_type() -> file_type ;
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fn get_env() -> eval::env ;
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fn get_cfg() -> ast::crate_cfg;
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fn get_session() -> session::session ;
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fn get_span() -> common::span ;
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@ -50,10 +49,9 @@ type parser =
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fn next_id() -> ast::node_id ;
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};
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fn new_parser(session::session sess, eval::env env,
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fn new_parser(session::session sess, ast::crate_cfg cfg,
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str path, uint pos, ast::node_id next_id) -> parser {
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obj stdio_parser(session::session sess,
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eval::env env,
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ast::crate_cfg cfg,
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file_type ftype,
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mutable token::token tok,
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@ -85,7 +83,6 @@ fn new_parser(session::session sess, eval::env env,
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fn get_hi_pos() -> uint { ret hi; }
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fn get_last_lo_pos() -> uint { ret last_lo; }
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fn get_file_type() -> file_type { ret ftype; }
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fn get_env() -> eval::env { ret env; }
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fn get_cfg() -> ast::crate_cfg { ret cfg; }
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fn get_prec_table() -> vec[op_spec] { ret precs; }
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fn get_str(token::str_num i) -> str {
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@ -106,17 +103,6 @@ fn new_parser(session::session sess, eval::env env,
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fn next_id() -> ast::node_id { ret next_id_var; }
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}
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auto cfg = {
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fn m(&tup(ast::ident, eval::val) item) -> @ast::meta_item {
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auto name = item._0;
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auto value = eval::val_as_str(item._1);
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auto meta_item_ = ast::meta_name_value(name, value);
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ret @rec(node=meta_item_,
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span=rec(lo=0u,hi=0u));
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}
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vec::map(m, env)
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};
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auto ftype = SOURCE_FILE;
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if (str::ends_with(path, ".rc")) { ftype = CRATE_FILE; }
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auto srdr = io::file_reader(path);
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@ -128,7 +114,7 @@ fn new_parser(session::session sess, eval::env env,
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lexer::consume_whitespace_and_comments(rdr);
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auto npos = rdr.get_chpos();
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ret stdio_parser(sess, env, cfg, ftype, lexer::next_token(rdr),
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ret stdio_parser(sess, cfg, ftype, lexer::next_token(rdr),
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npos, npos, npos, UNRESTRICTED, rdr,
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prec_table(), next_id, bad_expr_word_table(),
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ext::syntax_expander_table());
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@ -2465,9 +2451,10 @@ fn parse_crate_from_crate_file(&parser p) -> @ast::crate {
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mutable deps=deps,
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sess=p.get_session(),
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mutable chpos=p.get_chpos(),
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mutable next_id=p.next_id());
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mutable next_id=p.next_id(),
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cfg = p.get_cfg());
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auto m =
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eval::eval_crate_directives_to_mod(cx, p.get_env(), cdirs, prefix);
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eval::eval_crate_directives_to_mod(cx, cdirs, prefix);
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auto hi = p.get_hi_pos();
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expect(p, token::EOF);
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ret @spanned(lo, hi, rec(directives=cdirs,
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