Rollup merge of rust-lang#64035 - petrochenkov:stabmacgen, r=eddyb

Stabilize proc macros generating `macro_rules` items

Fn-like and attribute proc macros can now generate `macro_rules` items.

cc rust-lang#54727

Author: Centril

src/librustc/lib.rs

@@ -56,7 +56,7 @@
 #![feature(test)]
 #![feature(in_band_lifetimes)]
 #![feature(crate_visibility_modifier)]
-#![feature(proc_macro_hygiene)]
+#![cfg_attr(bootstrap, feature(proc_macro_hygiene))]
 #![feature(log_syntax)]
 #![feature(associated_type_bounds)]
 #![feature(rustc_attrs)]

src/libsyntax/ext/expand.rs

@@ -10,14 +10,14 @@ use crate::ext::mbe::macro_rules::annotate_err_with_kind;
 use crate::ext::placeholders::{placeholder, PlaceholderExpander};
 use crate::feature_gate::{self, Features, GateIssue, is_builtin_attr, emit_feature_err};
 use crate::mut_visit::*;
-use crate::parse::{DirectoryOwnership, PResult, ParseSess};
+use crate::parse::{DirectoryOwnership, PResult};
 use crate::parse::token;
 use crate::parse::parser::Parser;
 use crate::print::pprust;
 use crate::ptr::P;
 use crate::symbol::{sym, Symbol};
 use crate::tokenstream::{TokenStream, TokenTree};
-use crate::visit::{self, Visitor};
+use crate::visit::Visitor;
 use crate::util::map_in_place::MapInPlace;
 
 use errors::{Applicability, FatalError};
@@ -577,10 +577,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
                 SyntaxExtensionKind::Bang(expander) => {
                     self.gate_proc_macro_expansion_kind(span, fragment_kind);
                     let tok_result = expander.expand(self.cx, span, mac.stream());
-                    let result =
-                        self.parse_ast_fragment(tok_result, fragment_kind, &mac.path, span);
-                    self.gate_proc_macro_expansion(span, &result);
-                    result
+                    self.parse_ast_fragment(tok_result, fragment_kind, &mac.path, span)
                 }
                 SyntaxExtensionKind::LegacyBang(expander) => {
                     let prev = self.cx.current_expansion.prior_type_ascription;
@@ -624,10 +621,7 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
                     })), DUMMY_SP).into();
                     let input = self.extract_proc_macro_attr_input(attr.item.tokens, span);
                     let tok_result = expander.expand(self.cx, span, input, item_tok);
-                    let res =
-                        self.parse_ast_fragment(tok_result, fragment_kind, &attr.item.path, span);
-                    self.gate_proc_macro_expansion(span, &res);
-                    res
+                    self.parse_ast_fragment(tok_result, fragment_kind, &attr.item.path, span)
                 }
                 SyntaxExtensionKind::LegacyAttr(expander) => {
                     match attr.parse_meta(self.cx.parse_sess) {
@@ -718,41 +712,6 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
         );
     }
 
-    fn gate_proc_macro_expansion(&self, span: Span, fragment: &AstFragment) {
-        if self.cx.ecfg.proc_macro_hygiene() {
-            return
-        }
-
-        fragment.visit_with(&mut DisallowMacros {
-            span,
-            parse_sess: self.cx.parse_sess,
-        });
-
-        struct DisallowMacros<'a> {
-            span: Span,
-            parse_sess: &'a ParseSess,
-        }
-
-        impl<'ast, 'a> Visitor<'ast> for DisallowMacros<'a> {
-            fn visit_item(&mut self, i: &'ast ast::Item) {
-                if let ast::ItemKind::MacroDef(_) = i.kind {
-                    emit_feature_err(
-                        self.parse_sess,
-                        sym::proc_macro_hygiene,
-                        self.span,
-                        GateIssue::Language,
-                        "procedural macros cannot expand to macro definitions",
-                    );
-                }
-                visit::walk_item(self, i);
-            }
-
-            fn visit_mac(&mut self, _mac: &'ast ast::Mac) {
-                // ...
-            }
-        }
-    }
-
     fn gate_proc_macro_expansion_kind(&self, span: Span, kind: AstFragmentKind) {
         let kind = match kind {
             AstFragmentKind::Expr |

src/libsyntax_pos/lib.rs

@@ -12,7 +12,7 @@
 #![feature(non_exhaustive)]
 #![feature(optin_builtin_traits)]
 #![feature(rustc_attrs)]
-#![feature(proc_macro_hygiene)]
+#![cfg_attr(bootstrap, feature(proc_macro_hygiene))]
 #![feature(specialization)]
 #![feature(step_trait)]
 

src/test/ui/macros/same-sequence-span.rs

@@ -4,7 +4,6 @@
 // left-hand side of a macro definition behave as if they had unique spans, and in particular that
 // they don't crash the compiler.
 
-#![feature(proc_macro_hygiene)]
 #![allow(unused_macros)]
 
 extern crate proc_macro_sequence;

src/test/ui/macros/same-sequence-span.stderr

@@ -1,21 +1,21 @@
 error: `$x:expr` may be followed by `$y:tt`, which is not allowed for `expr` fragments
-  --> $DIR/same-sequence-span.rs:15:18
+  --> $DIR/same-sequence-span.rs:14:18
    |
 LL |     (1 $x:expr $($y:tt,)*
    |                  ^^^^^ not allowed after `expr` fragments
    |
    = note: allowed there are: `=>`, `,` or `;`
 
 error: `$x:expr` may be followed by `=`, which is not allowed for `expr` fragments
-  --> $DIR/same-sequence-span.rs:16:18
+  --> $DIR/same-sequence-span.rs:15:18
    |
 LL |                $(= $z:tt)*
    |                  ^ not allowed after `expr` fragments
    |
    = note: allowed there are: `=>`, `,` or `;`
 
 error: `$x:expr` may be followed by `$y:tt`, which is not allowed for `expr` fragments
-  --> $DIR/same-sequence-span.rs:20:1
+  --> $DIR/same-sequence-span.rs:19:1
    |
 LL |   proc_macro_sequence::make_foo!();
    |   ^--------------------------------
@@ -30,7 +30,7 @@ LL | | fn main() {}
    = note: allowed there are: `=>`, `,` or `;`
 
 error: `$x:expr` may be followed by `=`, which is not allowed for `expr` fragments
-  --> $DIR/same-sequence-span.rs:20:1
+  --> $DIR/same-sequence-span.rs:19:1
    |
 LL | proc_macro_sequence::make_foo!();
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

src/test/ui/proc-macro/auxiliary/gen-macro-rules-hygiene.rs

@@ -0,0 +1,23 @@
+// force-host
+// no-prefer-dynamic
+
+#![crate_type = "proc-macro"]
+
+extern crate proc_macro;
+use proc_macro::*;
+
+#[proc_macro]
+pub fn gen_macro_rules(_: TokenStream) -> TokenStream {
+    "
+    macro_rules! generated {() => {
+        struct ItemDef;
+        let local_def = 0;
+
+        ItemUse; // OK
+        local_use; // ERROR
+        break 'label_use; // ERROR
+
+        type DollarCrate = $crate::ItemUse; // OK
+    }}
+    ".parse().unwrap()
+}

src/test/ui/proc-macro/auxiliary/more-gates.rs

@@ -0,0 +1,23 @@
+// `macro_rules` items produced by transparent macros have correct hygiene in basic cases.
+// Local variables and labels are hygienic, items are not hygienic.
+// `$crate` refers to the crate that defines `macro_rules` and not the outer transparent macro.
+
+// aux-build:gen-macro-rules-hygiene.rs
+
+#[macro_use]
+extern crate gen_macro_rules_hygiene;
+
+struct ItemUse;
+
+gen_macro_rules!();
+//~^ ERROR use of undeclared label `'label_use`
+//~| ERROR cannot find value `local_use` in this scope
+
+fn main() {
+    'label_use: loop {
+        let local_use = 1;
+        generated!();
+        ItemDef; // OK
+        local_def; //~ ERROR cannot find value `local_def` in this scope
+    }
+}

src/test/ui/proc-macro/gen-macro-rules-hygiene.rs

@@ -0,0 +1,28 @@
+error[E0426]: use of undeclared label `'label_use`
+  --> $DIR/gen-macro-rules-hygiene.rs:12:1
+   |
+LL | gen_macro_rules!();
+   | ^^^^^^^^^^^^^^^^^^^ undeclared label `'label_use`
+...
+LL |         generated!();
+   |         ------------- in this macro invocation
+
+error[E0425]: cannot find value `local_use` in this scope
+  --> $DIR/gen-macro-rules-hygiene.rs:12:1
+   |
+LL | gen_macro_rules!();
+   | ^^^^^^^^^^^^^^^^^^^ not found in this scope
+...
+LL |         generated!();
+   |         ------------- in this macro invocation
+
+error[E0425]: cannot find value `local_def` in this scope
+  --> $DIR/gen-macro-rules-hygiene.rs:21:9
+   |
+LL |         local_def;
+   |         ^^^^^^^^^ not found in this scope
+
+error: aborting due to 3 previous errors
+
+Some errors have detailed explanations: E0425, E0426.
+For more information about an error, try `rustc --explain E0425`.