Auto merge of #3564 - RalfJung:pthread-sync, r=RalfJung

pthread shims: reorganize field offset handling, and add sanity checks

Author: bors

src/tools/miri/src/helpers.rs

@@ -255,14 +255,19 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
     }
 
     /// Evaluates the scalar at the specified path.
-    fn eval_path_scalar(&self, path: &[&str]) -> Scalar<Provenance> {
+    fn eval_path(&self, path: &[&str]) -> OpTy<'tcx, Provenance> {
         let this = self.eval_context_ref();
         let instance = this.resolve_path(path, Namespace::ValueNS);
         // We don't give a span -- this isn't actually used directly by the program anyway.
         let const_val = this.eval_global(instance).unwrap_or_else(|err| {
             panic!("failed to evaluate required Rust item: {path:?}\n{err:?}")
         });
-        this.read_scalar(&const_val)
+        const_val.into()
+    }
+    fn eval_path_scalar(&self, path: &[&str]) -> Scalar<Provenance> {
+        let this = self.eval_context_ref();
+        let val = this.eval_path(path);
+        this.read_scalar(&val)
             .unwrap_or_else(|err| panic!("failed to read required Rust item: {path:?}\n{err:?}"))
     }
 

src/tools/miri/src/shims/unix/foreign_items.rs

@@ -490,6 +490,18 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
                 let result = this.pthread_condattr_init(attr)?;
                 this.write_scalar(Scalar::from_i32(result), dest)?;
             }
+            "pthread_condattr_setclock" => {
+                let [attr, clock_id] =
+                    this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+                let result = this.pthread_condattr_setclock(attr, clock_id)?;
+                this.write_scalar(result, dest)?;
+            }
+            "pthread_condattr_getclock" => {
+                let [attr, clock_id] =
+                    this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
+                let result = this.pthread_condattr_getclock(attr, clock_id)?;
+                this.write_scalar(result, dest)?;
+            }
             "pthread_condattr_destroy" => {
                 let [attr] = this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
                 let result = this.pthread_condattr_destroy(attr)?;

src/tools/miri/src/shims/unix/linux/foreign_items.rs

@@ -73,18 +73,6 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
             }
 
             // Threading
-            "pthread_condattr_setclock" => {
-                let [attr, clock_id] =
-                    this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
-                let result = this.pthread_condattr_setclock(attr, clock_id)?;
-                this.write_scalar(result, dest)?;
-            }
-            "pthread_condattr_getclock" => {
-                let [attr, clock_id] =
-                    this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
-                let result = this.pthread_condattr_getclock(attr, clock_id)?;
-                this.write_scalar(result, dest)?;
-            }
             "pthread_setname_np" => {
                 let [thread, name] =
                     this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;

src/tools/miri/src/shims/unix/solarish/foreign_items.rs

@@ -1,7 +1,6 @@
 use rustc_span::Symbol;
 use rustc_target::spec::abi::Abi;
 
-use crate::shims::unix::*;
 use crate::*;
 use shims::EmulateItemResult;
 
@@ -11,6 +10,7 @@ pub fn is_dyn_sym(_name: &str) -> bool {
 
 impl<'mir, 'tcx: 'mir> EvalContextExt<'mir, 'tcx> for crate::MiriInterpCx<'mir, 'tcx> {}
 pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
+    #[allow(warnings)]
     fn emulate_foreign_item_inner(
         &mut self,
         link_name: Symbol,
@@ -20,20 +20,6 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriInterpCxExt<'mir, 'tcx> {
     ) -> InterpResult<'tcx, EmulateItemResult> {
         let this = self.eval_context_mut();
         match link_name.as_str() {
-            // Threading
-            "pthread_condattr_setclock" => {
-                let [attr, clock_id] =
-                    this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
-                let result = this.pthread_condattr_setclock(attr, clock_id)?;
-                this.write_scalar(result, dest)?;
-            }
-            "pthread_condattr_getclock" => {
-                let [attr, clock_id] =
-                    this.check_shim(abi, Abi::C { unwind: false }, link_name, args)?;
-                let result = this.pthread_condattr_getclock(attr, clock_id)?;
-                this.write_scalar(result, dest)?;
-            }
-
             _ => return Ok(EmulateItemResult::NotSupported),
         }
         Ok(EmulateItemResult::NeedsJumping)