652 lines
19 KiB
Rust
652 lines
19 KiB
Rust
import std.map.hashmap;
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import util.common.new_str_hash;
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import util.common.spanned;
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import util.common.span;
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import util.common.option;
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import util.common.some;
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import util.common.none;
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import util.common.ty_mach;
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import front.ast;
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import front.ast.ident;
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import front.ast.name;
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import front.ast.ty;
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import front.ast.expr;
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import front.ast.stmt;
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import front.ast.block;
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import front.ast.item;
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import front.ast.slot;
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import front.ast.decl;
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import front.ast.referent;
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import std._vec;
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import std.util.operator;
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type ast_fold[ENV] =
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@rec
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(
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// Name fold.
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(fn(&ENV e, &span sp, ast.name_ n) -> name) fold_name,
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// Type folds.
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(fn(&ENV e, &span sp) -> @ty) fold_ty_nil,
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(fn(&ENV e, &span sp) -> @ty) fold_ty_bool,
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(fn(&ENV e, &span sp) -> @ty) fold_ty_int,
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(fn(&ENV e, &span sp) -> @ty) fold_ty_uint,
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(fn(&ENV e, &span sp, ty_mach tm) -> @ty) fold_ty_machine,
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(fn(&ENV e, &span sp) -> @ty) fold_ty_char,
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(fn(&ENV e, &span sp) -> @ty) fold_ty_str,
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(fn(&ENV e, &span sp, @ty t) -> @ty) fold_ty_box,
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(fn(&ENV e, &span sp, ast.path p,
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&option[referent] r) -> @ty) fold_ty_path,
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// Expr folds.
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(fn(&ENV e, &span sp,
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vec[@expr] es) -> @expr) fold_expr_vec,
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(fn(&ENV e, &span sp,
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vec[@expr] es) -> @expr) fold_expr_tup,
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(fn(&ENV e, &span sp,
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vec[tup(ident,@expr)] fields) -> @expr) fold_expr_rec,
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(fn(&ENV e, &span sp,
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@expr f, vec[@expr] args) -> @expr) fold_expr_call,
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(fn(&ENV e, &span sp,
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ast.binop,
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@expr lhs, @expr rhs) -> @expr) fold_expr_binary,
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(fn(&ENV e, &span sp,
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ast.unop, @expr e) -> @expr) fold_expr_unary,
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(fn(&ENV e, &span sp,
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@ast.lit) -> @expr) fold_expr_lit,
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(fn(&ENV e, &span sp,
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&name n,
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&option[referent] r) -> @expr) fold_expr_name,
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(fn(&ENV e, &span sp,
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@expr e, ident i) -> @expr) fold_expr_field,
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(fn(&ENV e, &span sp,
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@expr e, @expr ix) -> @expr) fold_expr_index,
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(fn(&ENV e, &span sp,
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@expr cond, block thn,
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&option[block] els) -> @expr) fold_expr_if,
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(fn(&ENV e, &span sp,
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block blk) -> @expr) fold_expr_block,
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// Decl folds.
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(fn(&ENV e, &span sp,
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ident ident, bool infer,
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&option[@ty] ty) -> @decl) fold_decl_local,
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(fn(&ENV e, &span sp,
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&name name, @item item) -> @decl) fold_decl_item,
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// Stmt folds.
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(fn(&ENV e, &span sp,
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@decl decl) -> @stmt) fold_stmt_decl,
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(fn(&ENV e, &span sp,
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&option[@expr] rv) -> @stmt) fold_stmt_ret,
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(fn(&ENV e, &span sp,
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@expr e) -> @stmt) fold_stmt_log,
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(fn(&ENV e, &span sp,
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@expr e) -> @stmt) fold_stmt_expr,
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// Item folds.
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(fn(&ENV e, &span sp,
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&ast._fn f, ast.item_id id) -> @item) fold_item_fn,
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(fn(&ENV e, &span sp,
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&ast._mod m) -> @item) fold_item_mod,
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(fn(&ENV e, &span sp,
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@ty t, ast.item_id id) -> @item) fold_item_ty,
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// Additional nodes.
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(fn(&ENV e, &span sp,
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vec[@stmt] stmts) -> block) fold_block,
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(fn(&ENV e, vec[ast.input] inputs,
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&slot output, block body) -> ast._fn) fold_fn,
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(fn(&ENV e, &ast._mod m) -> ast._mod) fold_mod,
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(fn(&ENV e, &span sp,
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&ast._mod m) -> @ast.crate) fold_crate,
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// Env updates.
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(fn(&ENV e, @ast.crate c) -> ENV) update_env_for_crate,
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(fn(&ENV e, @item i) -> ENV) update_env_for_item,
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(fn(&ENV e, @stmt s) -> ENV) update_env_for_stmt,
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(fn(&ENV e, @expr x) -> ENV) update_env_for_expr,
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(fn(&ENV e, @ty t) -> ENV) update_env_for_ty,
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// Traversal control.
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(fn(&ENV v) -> bool) keep_going
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);
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//// Fold drivers.
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// FIXME: Finish these.
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fn fold_expr_name[ENV](&ENV env, ast_fold[ENV] fld, &name n,
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&option[referent] r) -> tup(name,option[referent]) {
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ret tup(n,r);
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}
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fn fold_ty[ENV](&ENV env, ast_fold[ENV] fld, @ty t) -> @ty {
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ret t;
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}
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fn fold_decl[ENV](&ENV env, ast_fold[ENV] fld, @decl d) -> @decl {
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ret d;
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}
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fn fold_exprs[ENV](&ENV env, ast_fold[ENV] fld, vec[@expr] e) -> vec[@expr] {
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let operator[@expr, @expr] fe = bind fold_expr[ENV](env, fld, _);
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ret _vec.map[@expr, @expr](fe, e);
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}
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fn fold_rec_entry[ENV](&ENV env, ast_fold[ENV] fld, &tup(ident,@expr) e)
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-> tup(ident,@expr) {
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ret tup(e._0, fold_expr(env, fld, e._1));
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}
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fn fold_expr[ENV](&ENV env, ast_fold[ENV] fld, &@expr e) -> @expr {
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let ENV env_ = fld.update_env_for_expr(env, e);
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if (!fld.keep_going(env_)) {
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ret e;
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}
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alt (e.node) {
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case (ast.expr_vec(?es)) {
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auto ees = fold_exprs(env_, fld, es);
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ret fld.fold_expr_vec(env_, e.span, ees);
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}
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case (ast.expr_tup(?es)) {
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auto ees = fold_exprs(env_, fld, es);
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ret fld.fold_expr_vec(env_, e.span, ees);
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}
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case (ast.expr_rec(?es)) {
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let operator[tup(ident,@expr), tup(ident,@expr)] fe =
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bind fold_rec_entry[ENV](env, fld, _);
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auto ees = _vec.map[tup(ident,@expr), tup(ident,@expr)](fe, es);
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ret fld.fold_expr_rec(env_, e.span, ees);
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}
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case (ast.expr_call(?f, ?args)) {
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auto ff = fold_expr(env_, fld, f);
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auto aargs = fold_exprs(env_, fld, args);
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ret fld.fold_expr_call(env_, e.span, ff, aargs);
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}
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case (ast.expr_binary(?op, ?a, ?b)) {
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auto aa = fold_expr(env_, fld, a);
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auto bb = fold_expr(env_, fld, b);
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ret fld.fold_expr_binary(env_, e.span, op, aa, bb);
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}
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case (ast.expr_unary(?op, ?a)) {
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auto aa = fold_expr(env_, fld, a);
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ret fld.fold_expr_unary(env_, e.span, op, a);
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}
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case (ast.expr_lit(?lit)) {
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ret fld.fold_expr_lit(env_, e.span, lit);
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}
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case (ast.expr_name(?n, ?r)) {
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auto nn = fold_expr_name(env_, fld, n, r);
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ret fld.fold_expr_name(env_, e.span, nn._0, nn._1);
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}
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case (ast.expr_field(?e, ?i)) {
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auto ee = fold_expr(env_, fld, e);
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ret fld.fold_expr_field(env_, e.span, ee, i);
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}
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case (ast.expr_index(?e, ?i)) {
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auto ee = fold_expr(env_, fld, e);
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auto ii = fold_expr(env_, fld, i);
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ret fld.fold_expr_index(env_, e.span, ee, ii);
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}
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case (ast.expr_if(?cnd, ?thn, ?els)) {
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auto ccnd = fold_expr(env_, fld, cnd);
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auto tthn = fold_block(env_, fld, thn);
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auto eels = none[block];
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alt (els) {
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case (some[block](?b)) {
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eels = some(fold_block(env_, fld, b));
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}
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}
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ret fld.fold_expr_if(env_, e.span, ccnd, tthn, eels);
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}
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case (ast.expr_block(?b)) {
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auto bb = fold_block(env_, fld, b);
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ret fld.fold_expr_block(env_, e.span, bb);
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}
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}
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ret e;
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}
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fn fold_stmt[ENV](&ENV env, ast_fold[ENV] fld, &@stmt s) -> @stmt {
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let ENV env_ = fld.update_env_for_stmt(env, s);
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if (!fld.keep_going(env_)) {
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ret s;
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}
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alt (s.node) {
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case (ast.stmt_decl(?d)) {
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auto dd = fold_decl(env_, fld, d);
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ret fld.fold_stmt_decl(env_, s.span, d);
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}
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case (ast.stmt_ret(?oe)) {
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auto oee = none[@expr];
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alt (oe) {
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case (some[@expr](?e)) {
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oee = some(fold_expr(env_, fld, e));
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}
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}
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ret fld.fold_stmt_ret(env_, s.span, oee);
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}
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case (ast.stmt_log(?e)) {
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auto ee = fold_expr(env_, fld, e);
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ret fld.fold_stmt_log(env_, s.span, e);
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}
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case (ast.stmt_expr(?e)) {
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auto ee = fold_expr(env_, fld, e);
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ret fld.fold_stmt_expr(env_, s.span, e);
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}
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}
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ret s;
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}
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fn fold_block[ENV](&ENV env, ast_fold[ENV] fld, &block blk) -> block {
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let operator[@stmt, @stmt] fs = bind fold_stmt[ENV](env, fld, _);
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auto stmts = _vec.map[@stmt, @stmt](fs, blk.node);
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ret respan(blk.span, stmts);
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}
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fn fold_slot[ENV](&ENV env, ast_fold[ENV] fld, &slot s) -> slot {
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auto ty = fold_ty[ENV](env, fld, s.ty);
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ret rec(ty=ty, mode=s.mode, id=s.id);
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}
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fn fold_fn[ENV](&ENV env, ast_fold[ENV] fld, &ast._fn f) -> ast._fn {
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fn fold_input[ENV](&ENV env, ast_fold[ENV] fld, &ast.input i)
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-> ast.input {
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ret rec(slot=fold_slot[ENV](env, fld, i.slot),
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ident=i.ident);
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}
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let operator[ast.input,ast.input] fi = bind fold_input[ENV](env, fld, _);
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auto inputs = _vec.map[ast.input, ast.input](fi, f.inputs);
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auto output = fold_slot[ENV](env, fld, f.output);
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auto body = fold_block[ENV](env, fld, f.body);
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ret fld.fold_fn(env, inputs, output, body);
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}
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fn fold_item[ENV](&ENV env, ast_fold[ENV] fld, @item i) -> @item {
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let ENV env_ = fld.update_env_for_item(env, i);
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if (!fld.keep_going(env_)) {
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ret i;
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}
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alt (i.node) {
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case (ast.item_fn(?ff, ?id)) {
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let ast._fn ff_ = fold_fn[ENV](env_, fld, ff);
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ret fld.fold_item_fn(env_, i.span, ff_, id);
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}
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case (ast.item_mod(?mm)) {
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let ast._mod mm_ = fold_mod[ENV](env_, fld, mm);
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ret fld.fold_item_mod(env_, i.span, mm_);
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}
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case (ast.item_ty(?ty, ?id)) {
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let @ast.ty ty_ = fold_ty[ENV](env_, fld, ty);
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ret fld.fold_item_ty(env_, i.span, ty_, id);
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}
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}
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fail;
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}
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fn fold_mod[ENV](&ENV e, ast_fold[ENV] fld, &ast._mod m_in) -> ast._mod {
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auto m_out = new_str_hash[@item]();
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for each (tup(ident, @item) pairs in m_in.items()) {
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auto i = fold_item[ENV](e, fld, pairs._1);
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m_out.insert(pairs._0, i);
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}
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ret fld.fold_mod(e, m_out);
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}
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fn fold_crate[ENV](&ENV env, ast_fold[ENV] fld, @ast.crate c) -> @ast.crate {
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let ENV env_ = fld.update_env_for_crate(env, c);
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let ast._mod m = fold_mod[ENV](env_, fld, c.node.module);
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ret fld.fold_crate(env_, c.span, m);
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}
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//// Identity folds.
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fn respan[T](&span sp, &T t) -> spanned[T] {
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ret rec(node=t, span=sp);
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}
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// Name identity.
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fn identity_fold_name[ENV](&ENV env, &span sp, ast.name_ n) -> name {
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ret respan(sp, n);
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}
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// Type identities.
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fn identity_fold_ty_nil[ENV](&ENV env, &span sp) -> @ty {
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ret @respan(sp, ast.ty_nil);
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}
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fn identity_fold_ty_bool[ENV](&ENV env, &span sp) -> @ty {
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ret @respan(sp, ast.ty_bool);
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}
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fn identity_fold_ty_int[ENV](&ENV env, &span sp) -> @ty {
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ret @respan(sp, ast.ty_int);
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}
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fn identity_fold_ty_uint[ENV](&ENV env, &span sp) -> @ty {
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ret @respan(sp, ast.ty_uint);
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}
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fn identity_fold_ty_machine[ENV](&ENV env, &span sp,
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ty_mach tm) -> @ty {
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ret @respan(sp, ast.ty_machine(tm));
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}
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fn identity_fold_ty_char[ENV](&ENV env, &span sp) -> @ty {
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ret @respan(sp, ast.ty_char);
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}
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fn identity_fold_ty_str[ENV](&ENV env, &span sp) -> @ty {
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ret @respan(sp, ast.ty_str);
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}
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fn identity_fold_ty_box[ENV](&ENV env, &span sp, @ty t) -> @ty {
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ret @respan(sp, ast.ty_box(t));
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}
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fn identity_fold_ty_path[ENV](&ENV env, &span sp, ast.path p,
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&option[referent] r) -> @ty {
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ret @respan(sp, ast.ty_path(p, r));
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}
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// Expr identities.
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fn identity_fold_expr_vec[ENV](&ENV env, &span sp, vec[@expr] es) -> @expr {
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ret @respan(sp, ast.expr_vec(es));
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}
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fn identity_fold_expr_tup[ENV](&ENV env, &span sp, vec[@expr] es) -> @expr {
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ret @respan(sp, ast.expr_tup(es));
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}
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fn identity_fold_expr_rec[ENV](&ENV env, &span sp,
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vec[tup(ident,@expr)] fields)
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-> @expr {
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ret @respan(sp, ast.expr_rec(fields));
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}
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fn identity_fold_expr_call[ENV](&ENV env, &span sp, @expr f,
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vec[@expr] args) -> @expr {
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ret @respan(sp, ast.expr_call(f, args));
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}
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fn identity_fold_expr_binary[ENV](&ENV env, &span sp, ast.binop b,
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@expr lhs, @expr rhs) -> @expr {
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ret @respan(sp, ast.expr_binary(b, lhs, rhs));
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}
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fn identity_fold_expr_unary[ENV](&ENV env, &span sp,
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ast.unop u, @expr e) -> @expr {
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ret @respan(sp, ast.expr_unary(u, e));
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}
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fn identity_fold_expr_lit[ENV](&ENV env, &span sp, @ast.lit lit) -> @expr {
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ret @respan(sp, ast.expr_lit(lit));
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}
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fn identity_fold_expr_name[ENV](&ENV env, &span sp, &name n,
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&option[referent] r) -> @expr {
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ret @respan(sp, ast.expr_name(n, r));
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}
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fn identity_fold_expr_field[ENV](&ENV env, &span sp,
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@expr e, ident i) -> @expr {
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ret @respan(sp, ast.expr_field(e, i));
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}
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fn identity_fold_expr_index[ENV](&ENV env, &span sp,
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@expr e, @expr ix) -> @expr {
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ret @respan(sp, ast.expr_index(e, ix));
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}
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fn identity_fold_expr_if[ENV](&ENV env, &span sp,
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@expr cond, block thn,
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&option[block] els) -> @expr {
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ret @respan(sp, ast.expr_if(cond, thn, els));
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}
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fn identity_fold_expr_block[ENV](&ENV env, &span sp, block blk) -> @expr {
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ret @respan(sp, ast.expr_block(blk));
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}
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// Decl identities.
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fn identity_fold_decl_local[ENV](&ENV e, &span sp,
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ident i, bool infer,
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&option[@ty] t) -> @decl {
|
|
ret @respan(sp, ast.decl_local(i, infer, t));
|
|
}
|
|
|
|
fn identity_fold_decl_item[ENV](&ENV e, &span sp,
|
|
&name n, @item i) -> @decl {
|
|
ret @respan(sp, ast.decl_item(n, i));
|
|
}
|
|
|
|
|
|
// Stmt identities.
|
|
|
|
fn identity_fold_stmt_decl[ENV](&ENV env, &span sp, @decl d) -> @stmt {
|
|
ret @respan(sp, ast.stmt_decl(d));
|
|
}
|
|
|
|
fn identity_fold_stmt_ret[ENV](&ENV env, &span sp,
|
|
&option[@expr] rv) -> @stmt {
|
|
ret @respan(sp, ast.stmt_ret(rv));
|
|
}
|
|
|
|
fn identity_fold_stmt_log[ENV](&ENV e, &span sp, @expr x) -> @stmt {
|
|
ret @respan(sp, ast.stmt_log(x));
|
|
}
|
|
|
|
fn identity_fold_stmt_expr[ENV](&ENV e, &span sp, @expr x) -> @stmt {
|
|
ret @respan(sp, ast.stmt_expr(x));
|
|
}
|
|
|
|
|
|
// Item identities.
|
|
|
|
fn identity_fold_item_fn[ENV](&ENV e, &span sp, &ast._fn f,
|
|
ast.item_id id) -> @item {
|
|
ret @respan(sp, ast.item_fn(f, id));
|
|
}
|
|
|
|
fn identity_fold_item_mod[ENV](&ENV e, &span sp, &ast._mod m) -> @item {
|
|
ret @respan(sp, ast.item_mod(m));
|
|
}
|
|
|
|
fn identity_fold_item_ty[ENV](&ENV e, &span sp, @ty t,
|
|
ast.item_id id) -> @item {
|
|
ret @respan(sp, ast.item_ty(t, id));
|
|
}
|
|
|
|
|
|
// Additional identities.
|
|
|
|
fn identity_fold_block[ENV](&ENV e, &span sp, vec[@stmt] stmts) -> block {
|
|
ret respan(sp, stmts);
|
|
}
|
|
|
|
fn identity_fold_fn[ENV](&ENV e,
|
|
vec[ast.input] inputs,
|
|
&slot output,
|
|
block body) -> ast._fn {
|
|
ret rec(inputs=inputs, output=output, body=body);
|
|
}
|
|
|
|
fn identity_fold_mod[ENV](&ENV e, &ast._mod m) -> ast._mod {
|
|
ret m;
|
|
}
|
|
|
|
fn identity_fold_crate[ENV](&ENV e, &span sp, &ast._mod m) -> @ast.crate {
|
|
ret @respan(sp, rec(module=m));
|
|
}
|
|
|
|
|
|
// Env update identities.
|
|
|
|
fn identity_update_env_for_crate[ENV](&ENV e, @ast.crate c) -> ENV {
|
|
ret e;
|
|
}
|
|
|
|
fn identity_update_env_for_item[ENV](&ENV e, @item i) -> ENV {
|
|
ret e;
|
|
}
|
|
|
|
fn identity_update_env_for_stmt[ENV](&ENV e, @stmt s) -> ENV {
|
|
ret e;
|
|
}
|
|
|
|
fn identity_update_env_for_expr[ENV](&ENV e, @expr x) -> ENV {
|
|
ret e;
|
|
}
|
|
|
|
fn identity_update_env_for_ty[ENV](&ENV e, @ty t) -> ENV {
|
|
ret e;
|
|
}
|
|
|
|
|
|
// Always-true traversal control fn.
|
|
|
|
fn always_keep_going[ENV](&ENV e) -> bool {
|
|
ret true;
|
|
}
|
|
|
|
|
|
fn new_identity_fold[ENV]() -> ast_fold[ENV] {
|
|
ret @rec
|
|
(
|
|
fold_name = bind identity_fold_name[ENV](_,_,_),
|
|
|
|
fold_ty_nil = bind identity_fold_ty_nil[ENV](_,_),
|
|
fold_ty_bool = bind identity_fold_ty_bool[ENV](_,_),
|
|
fold_ty_int = bind identity_fold_ty_int[ENV](_,_),
|
|
fold_ty_uint = bind identity_fold_ty_uint[ENV](_,_),
|
|
fold_ty_machine = bind identity_fold_ty_machine[ENV](_,_,_),
|
|
fold_ty_char = bind identity_fold_ty_char[ENV](_,_),
|
|
fold_ty_str = bind identity_fold_ty_str[ENV](_,_),
|
|
fold_ty_box = bind identity_fold_ty_box[ENV](_,_,_),
|
|
fold_ty_path = bind identity_fold_ty_path[ENV](_,_,_,_),
|
|
|
|
fold_expr_vec = bind identity_fold_expr_vec[ENV](_,_,_),
|
|
fold_expr_tup = bind identity_fold_expr_tup[ENV](_,_,_),
|
|
fold_expr_rec = bind identity_fold_expr_rec[ENV](_,_,_),
|
|
fold_expr_call = bind identity_fold_expr_call[ENV](_,_,_,_),
|
|
fold_expr_binary = bind identity_fold_expr_binary[ENV](_,_,_,_,_),
|
|
fold_expr_unary = bind identity_fold_expr_unary[ENV](_,_,_,_),
|
|
fold_expr_lit = bind identity_fold_expr_lit[ENV](_,_,_),
|
|
fold_expr_name = bind identity_fold_expr_name[ENV](_,_,_,_),
|
|
fold_expr_field = bind identity_fold_expr_field[ENV](_,_,_,_),
|
|
fold_expr_index = bind identity_fold_expr_index[ENV](_,_,_,_),
|
|
fold_expr_if = bind identity_fold_expr_if[ENV](_,_,_,_,_),
|
|
fold_expr_block = bind identity_fold_expr_block[ENV](_,_,_),
|
|
|
|
fold_decl_local = bind identity_fold_decl_local[ENV](_,_,_,_,_),
|
|
fold_decl_item = bind identity_fold_decl_item[ENV](_,_,_,_),
|
|
|
|
fold_stmt_decl = bind identity_fold_stmt_decl[ENV](_,_,_),
|
|
fold_stmt_ret = bind identity_fold_stmt_ret[ENV](_,_,_),
|
|
fold_stmt_log = bind identity_fold_stmt_log[ENV](_,_,_),
|
|
fold_stmt_expr = bind identity_fold_stmt_expr[ENV](_,_,_),
|
|
|
|
fold_item_fn = bind identity_fold_item_fn[ENV](_,_,_,_),
|
|
fold_item_mod = bind identity_fold_item_mod[ENV](_,_,_),
|
|
fold_item_ty = bind identity_fold_item_ty[ENV](_,_,_,_),
|
|
|
|
fold_block = bind identity_fold_block[ENV](_,_,_),
|
|
fold_fn = bind identity_fold_fn[ENV](_,_,_,_),
|
|
fold_mod = bind identity_fold_mod[ENV](_,_),
|
|
fold_crate = bind identity_fold_crate[ENV](_,_,_),
|
|
|
|
update_env_for_crate = bind identity_update_env_for_crate[ENV](_,_),
|
|
update_env_for_item = bind identity_update_env_for_item[ENV](_,_),
|
|
update_env_for_stmt = bind identity_update_env_for_stmt[ENV](_,_),
|
|
update_env_for_expr = bind identity_update_env_for_expr[ENV](_,_),
|
|
update_env_for_ty = bind identity_update_env_for_ty[ENV](_,_),
|
|
|
|
keep_going = bind always_keep_going[ENV](_)
|
|
);
|
|
}
|
|
|
|
|
|
//
|
|
// Local Variables:
|
|
// mode: rust
|
|
// fill-column: 78;
|
|
// indent-tabs-mode: nil
|
|
// c-basic-offset: 4
|
|
// buffer-file-coding-system: utf-8-unix
|
|
// compile-command: "make -k -C ../.. 2>&1 | sed -e 's/\\/x\\//x:\\//g'";
|
|
// End:
|
|
//
|