bjoernager/rust
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Remove pretty-print/reparse hack, and add derive-specific hack

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This commit is contained in:
Aaron Hill 2020-11-23 01:43:55 -05:00
parent 2987785df3
commit 530a629635
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GPG key ID: B4087E510E98B164
8 changed files with 186 additions and 410 deletions
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15
compiler/rustc_expand/src/base.rs
View file

@ -2,8 +2,8 @@ use crate::expand::{self, AstFragment, Invocation};
use crate::module::DirectoryOwnership;
use rustc_ast::ptr::P;
use rustc_ast::token;
use rustc_ast::tokenstream::TokenStream;
use rustc_ast::token::{self, Nonterminal};
use rustc_ast::tokenstream::{CanSynthesizeMissingTokens, TokenStream};
use rustc_ast::visit::{AssocCtxt, Visitor};
use rustc_ast::{self as ast, Attribute, NodeId, PatKind};
use rustc_attr::{self as attr, Deprecation, HasAttrs, Stability};
@ -119,8 +119,8 @@ impl Annotatable {
}
}
crate fn into_tokens(self, sess: &ParseSess) -> TokenStream {
let nt = match self {
crate fn into_nonterminal(self) -> Nonterminal {
match self {
Annotatable::Item(item) => token::NtItem(item),
Annotatable::TraitItem(item) | Annotatable::ImplItem(item) => {
token::NtItem(P(item.and_then(ast::AssocItem::into_item)))
@ -137,8 +137,11 @@ impl Annotatable {
| Annotatable::Param(..)
| Annotatable::StructField(..)
| Annotatable::Variant(..) => panic!("unexpected annotatable"),
};
nt_to_tokenstream(&nt, sess, DUMMY_SP)
}
}
crate fn into_tokens(self, sess: &ParseSess) -> TokenStream {
nt_to_tokenstream(&self.into_nonterminal(), sess, DUMMY_SP, CanSynthesizeMissingTokens::No)
}
pub fn expect_item(self) -> P<ast::Item> {

13
compiler/rustc_expand/src/config.rs
View file

@ -29,6 +29,7 @@ use smallvec::SmallVec;
pub struct StripUnconfigured<'a> {
pub sess: &'a Session,
pub features: Option<&'a Features>,
pub modified: bool,
}
fn get_features(
@ -199,7 +200,7 @@ fn get_features(
// `cfg_attr`-process the crate's attributes and compute the crate's features.
pub fn features(sess: &Session, mut krate: ast::Crate) -> (ast::Crate, Features) {
let mut strip_unconfigured = StripUnconfigured { sess, features: None };
let mut strip_unconfigured = StripUnconfigured { sess, features: None, modified: false };
let unconfigured_attrs = krate.attrs.clone();
let diag = &sess.parse_sess.span_diagnostic;
@ -243,7 +244,12 @@ const CFG_ATTR_NOTE_REF: &str = "for more information, visit \
impl<'a> StripUnconfigured<'a> {
pub fn configure<T: HasAttrs>(&mut self, mut node: T) -> Option<T> {
self.process_cfg_attrs(&mut node);
self.in_cfg(node.attrs()).then_some(node)
if self.in_cfg(node.attrs()) {
Some(node)
} else {
self.modified = true;
None
}
}
/// Parse and expand all `cfg_attr` attributes into a list of attributes
@ -270,6 +276,9 @@ impl<'a> StripUnconfigured<'a> {
return vec![attr];
}
// A `#[cfg_attr]` either gets removed, or replaced with a new attribute
self.modified = true;
let (cfg_predicate, expanded_attrs) = match self.parse_cfg_attr(&attr) {
None => return vec![],
Some(r) => r,

41
compiler/rustc_expand/src/expand.rs
View file

@ -12,7 +12,7 @@ use rustc_ast::ptr::P;
use rustc_ast::token;
use rustc_ast::tokenstream::TokenStream;
use rustc_ast::visit::{self, AssocCtxt, Visitor};
use rustc_ast::{self as ast, AttrItem, Block, LitKind, NodeId, PatKind, Path};
use rustc_ast::{self as ast, AttrItem, AttrStyle, Block, LitKind, NodeId, PatKind, Path};
use rustc_ast::{ItemKind, MacArgs, MacCallStmt, MacStmtStyle, StmtKind, Unsafe};
use rustc_ast_pretty::pprust;
use rustc_attr::{self as attr, is_builtin_attr, HasAttrs};
@ -522,12 +522,29 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
item.visit_attrs(|attrs| attrs.retain(|a| !a.has_name(sym::derive)));
(item, Vec::new())
} else {
let mut item = StripUnconfigured {
let mut visitor = StripUnconfigured {
sess: self.cx.sess,
features: self.cx.ecfg.features,
}
.fully_configure(item);
modified: false,
};
let mut item = visitor.fully_configure(item);
item.visit_attrs(|attrs| attrs.retain(|a| !a.has_name(sym::derive)));
if visitor.modified && !derives.is_empty() {
// Erase the tokens if cfg-stripping modified the item
// This will cause us to synthesize fake tokens
// when `nt_to_tokenstream` is called on this item.
match &mut item {
Annotatable::Item(item) => item.tokens = None,
Annotatable::Stmt(stmt) => {
if let StmtKind::Item(item) = &mut stmt.kind {
item.tokens = None
} else {
panic!("Unexpected stmt {:?}", stmt);
}
}
_ => panic!("Unexpected annotatable {:?}", item),
}
}
invocations.reserve(derives.len());
let derive_placeholders = derives
@ -622,7 +639,11 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
let invocations = {
let mut collector = InvocationCollector {
cfg: StripUnconfigured { sess: &self.cx.sess, features: self.cx.ecfg.features },
cfg: StripUnconfigured {
sess: &self.cx.sess,
features: self.cx.ecfg.features,
modified: false,
},
cx: self.cx,
invocations: Vec::new(),
monotonic: self.monotonic,
@ -716,7 +737,15 @@ impl<'a, 'b> MacroExpander<'a, 'b> {
SyntaxExtensionKind::Attr(expander) => {
self.gate_proc_macro_input(&item);
self.gate_proc_macro_attr_item(span, &item);
let tokens = item.into_tokens(&self.cx.sess.parse_sess);
let tokens = match attr.style {
AttrStyle::Outer => item.into_tokens(&self.cx.sess.parse_sess),
// FIXME: Properly collect tokens for inner attributes
AttrStyle::Inner => rustc_parse::fake_token_stream(
&self.cx.sess.parse_sess,
&item.into_nonterminal(),
span,
),
};
let attr_item = attr.unwrap_normal_item();
if let MacArgs::Eq(..) = attr_item.args {
self.cx.span_err(span, "key-value macro attributes are not supported");

9
compiler/rustc_expand/src/proc_macro.rs
View file

@ -3,7 +3,7 @@ use crate::proc_macro_server;
use rustc_ast::ptr::P;
use rustc_ast::token;
use rustc_ast::tokenstream::{TokenStream, TokenTree};
use rustc_ast::tokenstream::{CanSynthesizeMissingTokens, TokenStream, TokenTree};
use rustc_ast::{self as ast, *};
use rustc_data_structures::sync::Lrc;
use rustc_errors::{struct_span_err, Applicability, ErrorReported};
@ -94,7 +94,12 @@ impl MultiItemModifier for ProcMacroDerive {
let input = if item.pretty_printing_compatibility_hack() {
TokenTree::token(token::Interpolated(Lrc::new(item)), DUMMY_SP).into()
} else {
nt_to_tokenstream(&item, &ecx.sess.parse_sess, DUMMY_SP)
nt_to_tokenstream(
&item,
&ecx.sess.parse_sess,
DUMMY_SP,
CanSynthesizeMissingTokens::Yes,
)
};
let server = proc_macro_server::Rustc::new(ecx);

5
compiler/rustc_expand/src/proc_macro_server.rs
View file

@ -2,7 +2,8 @@ use crate::base::ExtCtxt;
use rustc_ast as ast;
use rustc_ast::token;
use rustc_ast::tokenstream::{self, DelimSpan, Spacing::*, TokenStream, TreeAndSpacing};
use rustc_ast::tokenstream::{self, CanSynthesizeMissingTokens};
use rustc_ast::tokenstream::{DelimSpan, Spacing::*, TokenStream, TreeAndSpacing};
use rustc_ast_pretty::pprust;
use rustc_data_structures::sync::Lrc;
use rustc_errors::Diagnostic;
@ -178,7 +179,7 @@ impl FromInternal<(TreeAndSpacing, &'_ ParseSess, &'_ mut Vec<Self>)>
{
TokenTree::Ident(Ident::new(sess, name.name, is_raw, name.span))
} else {
let stream = nt_to_tokenstream(&nt, sess, span);
let stream = nt_to_tokenstream(&nt, sess, span, CanSynthesizeMissingTokens::No);
TokenTree::Group(Group {
delimiter: Delimiter::None,
stream,