Inline and remove parse_crate{,_attrs}_from_{file,source_str}.

All four functions are simple and have a single call site.

This requires making `Parser::parse_inner_attributes` public, which is
no big deal.

compiler/rustc_driver_impl/src/lib.rs

@@ -32,6 +32,7 @@
 use rustc_lint::unerased_lint_store;
 use rustc_metadata::creader::MetadataLoader;
 use rustc_metadata::locator;
+use rustc_parse::{new_parser_from_file, new_parser_from_source_str};
 use rustc_session::config::{nightly_options, CG_OPTIONS, Z_OPTIONS};
 use rustc_session::config::{ErrorOutputType, Input, OutFileName, OutputType};
 use rustc_session::getopts::{self, Matches};
@@ -1264,12 +1265,13 @@ pub fn handle_options(early_dcx: &EarlyDiagCtxt, args: &[String]) -> Option<geto
 }
 
 fn parse_crate_attrs<'a>(sess: &'a Session) -> PResult<'a, ast::AttrVec> {
-    match &sess.io.input {
-        Input::File(ifile) => rustc_parse::parse_crate_attrs_from_file(ifile, &sess.psess),
+    let mut parser = match &sess.io.input {
+        Input::File(file) => new_parser_from_file(&sess.psess, file, None),
         Input::Str { name, input } => {
-            rustc_parse::parse_crate_attrs_from_source_str(name.clone(), input.clone(), &sess.psess)
+            new_parser_from_source_str(&sess.psess, name.clone(), input.clone())
         }
-    }
+    };
+    parser.parse_inner_attributes()
 }
 
 /// Runs a closure and catches unwinds triggered by fatal errors.

compiler/rustc_interface/src/passes.rs

@@ -19,7 +19,7 @@
 use rustc_middle::dep_graph::DepGraph;
 use rustc_middle::ty::{self, GlobalCtxt, RegisteredTools, TyCtxt};
 use rustc_middle::util::Providers;
-use rustc_parse::{parse_crate_from_file, parse_crate_from_source_str, validate_attr};
+use rustc_parse::{new_parser_from_file, new_parser_from_source_str, validate_attr};
 use rustc_passes::{abi_test, hir_stats, layout_test};
 use rustc_resolve::Resolver;
 use rustc_session::code_stats::VTableSizeInfo;
@@ -42,11 +42,14 @@
 use tracing::{info, instrument};
 
 pub fn parse<'a>(sess: &'a Session) -> PResult<'a, ast::Crate> {
-    let krate = sess.time("parse_crate", || match &sess.io.input {
-        Input::File(file) => parse_crate_from_file(file, &sess.psess),
-        Input::Str { input, name } => {
-            parse_crate_from_source_str(name.clone(), input.clone(), &sess.psess)
-        }
+    let krate = sess.time("parse_crate", || {
+        let mut parser = match &sess.io.input {
+            Input::File(file) => new_parser_from_file(&sess.psess, file, None),
+            Input::Str { input, name } => {
+                new_parser_from_source_str(&sess.psess, name.clone(), input.clone())
+            }
+        };
+        parser.parse_crate_mod()
     })?;
 
     if sess.opts.unstable_opts.input_stats {

compiler/rustc_parse/src/lib.rs

@@ -47,35 +47,6 @@ fn unwrap_or_emit_fatal<T>(expr: Result<T, Vec<Diag<'_>>>) -> T {
     }
 }
 
-pub fn parse_crate_from_file<'a>(input: &Path, psess: &'a ParseSess) -> PResult<'a, ast::Crate> {
-    let mut parser = new_parser_from_file(psess, input, None);
-    parser.parse_crate_mod()
-}
-
-pub fn parse_crate_attrs_from_file<'a>(
-    input: &Path,
-    psess: &'a ParseSess,
-) -> PResult<'a, ast::AttrVec> {
-    let mut parser = new_parser_from_file(psess, input, None);
-    parser.parse_inner_attributes()
-}
-
-pub fn parse_crate_from_source_str(
-    name: FileName,
-    source: String,
-    psess: &ParseSess,
-) -> PResult<'_, ast::Crate> {
-    new_parser_from_source_str(psess, name, source).parse_crate_mod()
-}
-
-pub fn parse_crate_attrs_from_source_str(
-    name: FileName,
-    source: String,
-    psess: &ParseSess,
-) -> PResult<'_, ast::AttrVec> {
-    new_parser_from_source_str(psess, name, source).parse_inner_attributes()
-}
-
 /// Creates a new parser from a source string.
 pub fn new_parser_from_source_str(psess: &ParseSess, name: FileName, source: String) -> Parser<'_> {
     unwrap_or_emit_fatal(maybe_new_parser_from_source_str(psess, name, source))

compiler/rustc_parse/src/parser/attr.rs

@@ -265,7 +265,7 @@ pub fn parse_attr_item(&mut self, capture_tokens: bool) -> PResult<'a, ast::Attr
     /// terminated by a semicolon.
     ///
     /// Matches `inner_attrs*`.
-    pub(crate) fn parse_inner_attributes(&mut self) -> PResult<'a, ast::AttrVec> {
+    pub fn parse_inner_attributes(&mut self) -> PResult<'a, ast::AttrVec> {
         let mut attrs = ast::AttrVec::new();
         loop {
             let start_pos: u32 = self.num_bump_calls.try_into().unwrap();