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Rollup merge of rust-lang#64528 - Aaron1011:fix/proc-macro-type, r=al…
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…excrichton

Load proc macro metadata in the correct order.

Serialized proc macro metadata is assumed to have a one-to-one
correspondence with the entries in static array generated by proc_macro_harness.
However, we were previously serializing proc macro metadata in a
different order than proc macros were laied out in the static array.
This lead to us associating the wrong data with a proc macro when
generating documentation, causing Rustdoc to generate incorrect docs for
proc macros.

This commit keeps track of the order in which we insert proc macros into
the generated static array. We use this same order when serializing proc
macro metadata, ensuring that we can later associate the metadata for a
proc macro with its entry in the static array.

Fixes rust-lang#64251
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tmandry authored Sep 18, 2019
2 parents 8907d62 + 3daa8bd commit 987e712
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Showing 3 changed files with 79 additions and 49 deletions.
6 changes: 5 additions & 1 deletion src/librustc_metadata/decoder.rs
Original file line number Diff line number Diff line change
Expand Up @@ -489,7 +489,11 @@ impl<'a, 'tcx> CrateMetadata {

fn raw_proc_macro(&self, id: DefIndex) -> &ProcMacro {
// DefIndex's in root.proc_macro_data have a one-to-one correspondence
// with items in 'raw_proc_macros'
// with items in 'raw_proc_macros'.
// NOTE: If you update the order of macros in 'proc_macro_data' for any reason,
// you must also update src/libsyntax_ext/proc_macro_harness.rs
// Failing to do so will result in incorrect data being associated
// with proc macros when deserialized.
let pos = self.root.proc_macro_data.unwrap().decode(self).position(|i| i == id).unwrap();
&self.raw_proc_macros.unwrap()[pos]
}
Expand Down
109 changes: 62 additions & 47 deletions src/libsyntax_ext/proc_macro_harness.rs
Original file line number Diff line number Diff line change
Expand Up @@ -20,15 +20,24 @@ struct ProcMacroDerive {
attrs: Vec<ast::Name>,
}

enum ProcMacroDefType {
Attr,
Bang
}

struct ProcMacroDef {
function_name: Ident,
span: Span,
def_type: ProcMacroDefType
}

enum ProcMacro {
Derive(ProcMacroDerive),
Def(ProcMacroDef)
}

struct CollectProcMacros<'a> {
derives: Vec<ProcMacroDerive>,
attr_macros: Vec<ProcMacroDef>,
bang_macros: Vec<ProcMacroDef>,
macros: Vec<ProcMacro>,
in_root: bool,
handler: &'a errors::Handler,
is_proc_macro_crate: bool,
Expand All @@ -46,22 +55,22 @@ pub fn inject(sess: &ParseSess,
let ecfg = ExpansionConfig::default("proc_macro".to_string());
let mut cx = ExtCtxt::new(sess, ecfg, resolver);

let (derives, attr_macros, bang_macros) = {
let mut collect = CollectProcMacros {
derives: Vec::new(),
attr_macros: Vec::new(),
bang_macros: Vec::new(),
in_root: true,
handler,
is_proc_macro_crate,
is_test_crate,
};
if has_proc_macro_decls || is_proc_macro_crate {
visit::walk_crate(&mut collect, &krate);
}
(collect.derives, collect.attr_macros, collect.bang_macros)
let mut collect = CollectProcMacros {
macros: Vec::new(),
in_root: true,
handler,
is_proc_macro_crate,
is_test_crate,
};

if has_proc_macro_decls || is_proc_macro_crate {
visit::walk_crate(&mut collect, &krate);
}
// NOTE: If you change the order of macros in this vec
// for any reason, you must also update 'raw_proc_macro'
// in src/librustc_metadata/decoder.rs
let macros = collect.macros;

if !is_proc_macro_crate {
return krate
}
Expand All @@ -74,7 +83,7 @@ pub fn inject(sess: &ParseSess,
return krate;
}

krate.module.items.push(mk_decls(&mut cx, &derives, &attr_macros, &bang_macros));
krate.module.items.push(mk_decls(&mut cx, &macros));

krate
}
Expand Down Expand Up @@ -161,12 +170,12 @@ impl<'a> CollectProcMacros<'a> {
};

if self.in_root && item.vis.node.is_pub() {
self.derives.push(ProcMacroDerive {
self.macros.push(ProcMacro::Derive(ProcMacroDerive {
span: item.span,
trait_name: trait_ident.name,
function_name: item.ident,
attrs: proc_attrs,
});
}));
} else {
let msg = if !self.in_root {
"functions tagged with `#[proc_macro_derive]` must \
Expand All @@ -180,10 +189,11 @@ impl<'a> CollectProcMacros<'a> {

fn collect_attr_proc_macro(&mut self, item: &'a ast::Item) {
if self.in_root && item.vis.node.is_pub() {
self.attr_macros.push(ProcMacroDef {
self.macros.push(ProcMacro::Def(ProcMacroDef {
span: item.span,
function_name: item.ident,
});
def_type: ProcMacroDefType::Attr
}));
} else {
let msg = if !self.in_root {
"functions tagged with `#[proc_macro_attribute]` must \
Expand All @@ -197,10 +207,11 @@ impl<'a> CollectProcMacros<'a> {

fn collect_bang_proc_macro(&mut self, item: &'a ast::Item) {
if self.in_root && item.vis.node.is_pub() {
self.bang_macros.push(ProcMacroDef {
self.macros.push(ProcMacro::Def(ProcMacroDef {
span: item.span,
function_name: item.ident,
});
def_type: ProcMacroDefType::Bang
}));
} else {
let msg = if !self.in_root {
"functions tagged with `#[proc_macro]` must \
Expand Down Expand Up @@ -322,9 +333,7 @@ impl<'a> Visitor<'a> for CollectProcMacros<'a> {
// }
fn mk_decls(
cx: &mut ExtCtxt<'_>,
custom_derives: &[ProcMacroDerive],
custom_attrs: &[ProcMacroDef],
custom_macros: &[ProcMacroDef],
macros: &[ProcMacro],
) -> P<ast::Item> {
let expn_id = cx.resolver.expansion_for_ast_pass(
DUMMY_SP,
Expand Down Expand Up @@ -354,26 +363,32 @@ fn mk_decls(
let proc_macro_ty_method_path = |method| cx.expr_path(cx.path(span, vec![
proc_macro, bridge, client, proc_macro_ty, method,
]));
custom_derives.iter().map(|cd| {
cx.expr_call(span, proc_macro_ty_method_path(custom_derive), vec![
cx.expr_str(cd.span, cd.trait_name),
cx.expr_vec_slice(
span,
cd.attrs.iter().map(|&s| cx.expr_str(cd.span, s)).collect::<Vec<_>>()
),
local_path(cd.span, cd.function_name),
])
}).chain(custom_attrs.iter().map(|ca| {
cx.expr_call(span, proc_macro_ty_method_path(attr), vec![
cx.expr_str(ca.span, ca.function_name.name),
local_path(ca.span, ca.function_name),
])
})).chain(custom_macros.iter().map(|cm| {
cx.expr_call(span, proc_macro_ty_method_path(bang), vec![
cx.expr_str(cm.span, cm.function_name.name),
local_path(cm.span, cm.function_name),
])
})).collect()
macros.iter().map(|m| {
match m {
ProcMacro::Derive(cd) => {
cx.expr_call(span, proc_macro_ty_method_path(custom_derive), vec![
cx.expr_str(cd.span, cd.trait_name),
cx.expr_vec_slice(
span,
cd.attrs.iter().map(|&s| cx.expr_str(cd.span, s)).collect::<Vec<_>>()
),
local_path(cd.span, cd.function_name),
])
},
ProcMacro::Def(ca) => {
let ident = match ca.def_type {
ProcMacroDefType::Attr => attr,
ProcMacroDefType::Bang => bang
};

cx.expr_call(span, proc_macro_ty_method_path(ident), vec![
cx.expr_str(ca.span, ca.function_name.name),
local_path(ca.span, ca.function_name),
])

}
}
}).collect()
};

let decls_static = cx.item_static(
Expand Down
13 changes: 12 additions & 1 deletion src/test/rustdoc/inline_cross/proc_macro.rs
Original file line number Diff line number Diff line change
Expand Up @@ -10,8 +10,19 @@ extern crate some_macros;
// @has proc_macro/macro.some_proc_macro.html
// @has proc_macro/attr.some_proc_attr.html
// @has proc_macro/derive.SomeDerive.html
pub use some_macros::{some_proc_macro, some_proc_attr, SomeDerive};

// @has proc_macro/macro.some_proc_macro.html
// @has - 'a proc-macro that swallows its input and does nothing.'
pub use some_macros::some_proc_macro;

// @has proc_macro/macro.reexported_macro.html
// @has - 'Doc comment from the original crate'
pub use some_macros::reexported_macro;

// @has proc_macro/attr.some_proc_attr.html
// @has - 'a proc-macro attribute that passes its item through verbatim.'
pub use some_macros::some_proc_attr;

// @has proc_macro/derive.SomeDerive.html
// @has - 'a derive attribute that adds nothing to its input.'
pub use some_macros::SomeDerive;

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