Auto merge of #127076 - matthiaskrgr:rollup-l01gm36, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - #124741 (patchable-function-entry: Add unstable compiler flag and attribute)
 - #126470 (make cargo submodule optional)
 - #126956 (core: avoid `extern type`s in formatting infrastructure)
 - #126970 (Simplify `str::clone_into`)
 - #127022 (Support fetching `Attribute` of items.)
 - #127058 (Tighten `fn_decl_span` for async blocks)

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 27 insertions, 0 deletions

diff --git a/compiler/rustc_middle/src/middle/codegen_fn_attrs.rs b/compiler/rustc_middle/src/middle/codegen_fn_attrs.rs
index c8f0d0795a3..3ddf889b63a 100644
--- a/compiler/rustc_middle/src/middle/codegen_fn_attrs.rs
+++ b/compiler/rustc_middle/src/middle/codegen_fn_attrs.rs
@@ -45,6 +45,32 @@ pub struct CodegenFnAttrs {
     /// The `#[repr(align(...))]` attribute. Indicates the value of which the function should be
     /// aligned to.
     pub alignment: Option<Align>,
+    /// The `#[patchable_function_entry(...)]` attribute. Indicates how many nops should be around
+    /// the function entry.
+    pub patchable_function_entry: Option<PatchableFunctionEntry>,
+}
+
+#[derive(Copy, Clone, Debug, TyEncodable, TyDecodable, HashStable)]
+pub struct PatchableFunctionEntry {
+    /// Nops to prepend to the function
+    prefix: u8,
+    /// Nops after entry, but before body
+    entry: u8,
+}
+
+impl PatchableFunctionEntry {
+    pub fn from_config(config: rustc_session::config::PatchableFunctionEntry) -> Self {
+        Self { prefix: config.prefix(), entry: config.entry() }
+    }
+    pub fn from_prefix_and_entry(prefix: u8, entry: u8) -> Self {
+        Self { prefix, entry }
+    }
+    pub fn prefix(&self) -> u8 {
+        self.prefix
+    }
+    pub fn entry(&self) -> u8 {
+        self.entry
+    }
 }
 
 #[derive(Clone, Copy, PartialEq, Eq, TyEncodable, TyDecodable, HashStable)]
@@ -121,6 +147,7 @@ impl CodegenFnAttrs {
             no_sanitize: SanitizerSet::empty(),
             instruction_set: None,
             alignment: None,
+            patchable_function_entry: None,
         }
     }