sanitizers: Create the rustc_sanitizers crate

Create the rustc_sanitizers crate and move the source code for the CFI
and KCFI sanitizers to it.

Co-authored-by: David Wood <agile.lion3441@fuligin.ink>

Author: rcvalle

Cargo.lock

@@ -3670,6 +3670,7 @@ dependencies = [
  "rustc_metadata",
  "rustc_middle",
  "rustc_query_system",
+ "rustc_sanitizers",
  "rustc_session",
  "rustc_span",
  "rustc_symbol_mangling",
@@ -4558,6 +4559,21 @@ dependencies = [
  "tracing",
 ]
 
+[[package]]
+name = "rustc_sanitizers"
+version = "0.0.0"
+dependencies = [
+ "bitflags 2.5.0",
+ "rustc_data_structures",
+ "rustc_hir",
+ "rustc_middle",
+ "rustc_span",
+ "rustc_target",
+ "rustc_trait_selection",
+ "tracing",
+ "twox-hash",
+]
+
 [[package]]
 name = "rustc_serialize"
 version = "0.0.0"
@@ -4633,7 +4649,6 @@ dependencies = [
 name = "rustc_symbol_mangling"
 version = "0.0.0"
 dependencies = [
- "bitflags 2.5.0",
  "punycode",
  "rustc-demangle",
  "rustc_data_structures",
@@ -4643,9 +4658,7 @@ dependencies = [
  "rustc_session",
  "rustc_span",
  "rustc_target",
- "rustc_trait_selection",
  "tracing",
- "twox-hash",
 ]
 
 [[package]]

compiler/rustc_codegen_llvm/Cargo.toml

@@ -28,6 +28,7 @@ rustc_macros = { path = "../rustc_macros" }
 rustc_metadata = { path = "../rustc_metadata" }
 rustc_middle = { path = "../rustc_middle" }
 rustc_query_system = { path = "../rustc_query_system" }
+rustc_sanitizers = { path = "../rustc_sanitizers" }
 rustc_session = { path = "../rustc_session" }
 rustc_span = { path = "../rustc_span" }
 rustc_symbol_mangling = { path = "../rustc_symbol_mangling" }

compiler/rustc_codegen_llvm/src/builder.rs

@@ -20,12 +20,9 @@ use rustc_middle::ty::layout::{
     FnAbiError, FnAbiOfHelpers, FnAbiRequest, LayoutError, LayoutOfHelpers, TyAndLayout,
 };
 use rustc_middle::ty::{self, Instance, Ty, TyCtxt};
+use rustc_sanitizers::{cfi, kcfi};
 use rustc_session::config::OptLevel;
 use rustc_span::Span;
-use rustc_symbol_mangling::typeid::{
-    kcfi_typeid_for_fnabi, kcfi_typeid_for_instance, typeid_for_fnabi, typeid_for_instance,
-    TypeIdOptions,
-};
 use rustc_target::abi::{self, call::FnAbi, Align, Size, WrappingRange};
 use rustc_target::spec::{HasTargetSpec, SanitizerSet, Target};
 use smallvec::SmallVec;
@@ -1632,18 +1629,18 @@ impl<'a, 'll, 'tcx> Builder<'a, 'll, 'tcx> {
                 return;
             }
 
-            let mut options = TypeIdOptions::empty();
+            let mut options = cfi::TypeIdOptions::empty();
             if self.tcx.sess.is_sanitizer_cfi_generalize_pointers_enabled() {
-                options.insert(TypeIdOptions::GENERALIZE_POINTERS);
+                options.insert(cfi::TypeIdOptions::GENERALIZE_POINTERS);
             }
             if self.tcx.sess.is_sanitizer_cfi_normalize_integers_enabled() {
-                options.insert(TypeIdOptions::NORMALIZE_INTEGERS);
+                options.insert(cfi::TypeIdOptions::NORMALIZE_INTEGERS);
             }
 
             let typeid = if let Some(instance) = instance {
-                typeid_for_instance(self.tcx, instance, options)
+                cfi::typeid_for_instance(self.tcx, instance, options)
             } else {
-                typeid_for_fnabi(self.tcx, fn_abi, options)
+                cfi::typeid_for_fnabi(self.tcx, fn_abi, options)
             };
             let typeid_metadata = self.cx.typeid_metadata(typeid).unwrap();
 
@@ -1680,18 +1677,18 @@ impl<'a, 'll, 'tcx> Builder<'a, 'll, 'tcx> {
                 return None;
             }
 
-            let mut options = TypeIdOptions::empty();
+            let mut options = kcfi::TypeIdOptions::empty();
             if self.tcx.sess.is_sanitizer_cfi_generalize_pointers_enabled() {
-                options.insert(TypeIdOptions::GENERALIZE_POINTERS);
+                options.insert(kcfi::TypeIdOptions::GENERALIZE_POINTERS);
             }
             if self.tcx.sess.is_sanitizer_cfi_normalize_integers_enabled() {
-                options.insert(TypeIdOptions::NORMALIZE_INTEGERS);
+                options.insert(kcfi::TypeIdOptions::NORMALIZE_INTEGERS);
             }
 
             let kcfi_typeid = if let Some(instance) = instance {
-                kcfi_typeid_for_instance(self.tcx, instance, options)
+                kcfi::typeid_for_instance(self.tcx, instance, options)
             } else {
-                kcfi_typeid_for_fnabi(self.tcx, fn_abi, options)
+                kcfi::typeid_for_fnabi(self.tcx, fn_abi, options)
             };
 
             Some(llvm::OperandBundleDef::new("kcfi", &[self.const_u32(kcfi_typeid)]))

compiler/rustc_codegen_llvm/src/declare.rs

@@ -22,10 +22,7 @@ use itertools::Itertools;
 use rustc_codegen_ssa::traits::TypeMembershipMethods;
 use rustc_data_structures::fx::FxIndexSet;
 use rustc_middle::ty::{Instance, Ty};
-use rustc_symbol_mangling::typeid::{
-    kcfi_typeid_for_fnabi, kcfi_typeid_for_instance, typeid_for_fnabi, typeid_for_instance,
-    TypeIdOptions,
-};
+use rustc_sanitizers::{cfi, kcfi};
 use smallvec::SmallVec;
 
 /// Declare a function.
@@ -145,47 +142,49 @@ impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
             if let Some(instance) = instance {
                 let mut typeids = FxIndexSet::default();
                 for options in [
-                    TypeIdOptions::GENERALIZE_POINTERS,
-                    TypeIdOptions::NORMALIZE_INTEGERS,
-                    TypeIdOptions::USE_CONCRETE_SELF,
+                    cfi::TypeIdOptions::GENERALIZE_POINTERS,
+                    cfi::TypeIdOptions::NORMALIZE_INTEGERS,
+                    cfi::TypeIdOptions::USE_CONCRETE_SELF,
                 ]
                 .into_iter()
                 .powerset()
-                .map(TypeIdOptions::from_iter)
+                .map(cfi::TypeIdOptions::from_iter)
                 {
-                    let typeid = typeid_for_instance(self.tcx, instance, options);
+                    let typeid = cfi::typeid_for_instance(self.tcx, instance, options);
                     if typeids.insert(typeid.clone()) {
                         self.add_type_metadata(llfn, typeid);
                     }
                 }
             } else {
-                for options in
-                    [TypeIdOptions::GENERALIZE_POINTERS, TypeIdOptions::NORMALIZE_INTEGERS]
-                        .into_iter()
-                        .powerset()
-                        .map(TypeIdOptions::from_iter)
+                for options in [
+                    cfi::TypeIdOptions::GENERALIZE_POINTERS,
+                    cfi::TypeIdOptions::NORMALIZE_INTEGERS,
+                ]
+                .into_iter()
+                .powerset()
+                .map(cfi::TypeIdOptions::from_iter)
                 {
-                    let typeid = typeid_for_fnabi(self.tcx, fn_abi, options);
+                    let typeid = cfi::typeid_for_fnabi(self.tcx, fn_abi, options);
                     self.add_type_metadata(llfn, typeid);
                 }
             }
         }
 
         if self.tcx.sess.is_sanitizer_kcfi_enabled() {
             // LLVM KCFI does not support multiple !kcfi_type attachments
-            let mut options = TypeIdOptions::empty();
+            let mut options = kcfi::TypeIdOptions::empty();
             if self.tcx.sess.is_sanitizer_cfi_generalize_pointers_enabled() {
-                options.insert(TypeIdOptions::GENERALIZE_POINTERS);
+                options.insert(kcfi::TypeIdOptions::GENERALIZE_POINTERS);
             }
             if self.tcx.sess.is_sanitizer_cfi_normalize_integers_enabled() {
-                options.insert(TypeIdOptions::NORMALIZE_INTEGERS);
+                options.insert(kcfi::TypeIdOptions::NORMALIZE_INTEGERS);
             }
 
             if let Some(instance) = instance {
-                let kcfi_typeid = kcfi_typeid_for_instance(self.tcx, instance, options);
+                let kcfi_typeid = kcfi::typeid_for_instance(self.tcx, instance, options);
                 self.set_kcfi_type_metadata(llfn, kcfi_typeid);
             } else {
-                let kcfi_typeid = kcfi_typeid_for_fnabi(self.tcx, fn_abi, options);
+                let kcfi_typeid = kcfi::typeid_for_fnabi(self.tcx, fn_abi, options);
                 self.set_kcfi_type_metadata(llfn, kcfi_typeid);
             }
         }

compiler/rustc_sanitizers/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "rustc_sanitizers"
+version = "0.0.0"
+edition = "2021"
+
+[dependencies]
+bitflags = "2.5.0"
+tracing = "0.1"
+twox-hash = "1.6.3"
+rustc_data_structures = { path = "../rustc_data_structures" }
+rustc_hir = { path = "../rustc_hir" }
+rustc_middle = { path = "../rustc_middle" }
+rustc_span = { path = "../rustc_span" }
+rustc_target = { path = "../rustc_target" }
+rustc_trait_selection = { path = "../rustc_trait_selection" }

compiler/rustc_sanitizers/README.md

@@ -0,0 +1,2 @@
+The `rustc_sanitizers` crate contains the source code for providing support for
+the [sanitizers](https://github.com/google/sanitizers) to the Rust compiler.

compiler/rustc_sanitizers/src/cfi/mod.rs

@@ -0,0 +1,6 @@
+//! LLVM Control Flow Integrity (CFI) and cross-language LLVM CFI support for the Rust compiler.
+//!
+//! For more information about LLVM CFI and cross-language LLVM CFI support for the Rust compiler,
+//! see design document in the tracking issue #89653.
+pub mod typeid;
+pub use crate::cfi::typeid::{typeid_for_fnabi, typeid_for_instance, TypeIdOptions};