add dummy stat shim

Author: pvdrz

src/shims/foreign_items.rs

@@ -494,6 +494,11 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
                 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
             }
 
+            "stat64" => {
+                let result = this.stat(args[0], args[1])?;
+                this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;
+            }
+
             "clock_gettime" => {
                 let result = this.clock_gettime(args[0], args[1])?;
                 this.write_scalar(Scalar::from_int(result, dest.layout.size), dest)?;

src/shims/fs.rs

@@ -261,6 +261,55 @@ pub trait EvalContextExt<'mir, 'tcx: 'mir>: crate::MiriEvalContextExt<'mir, 'tcx
         this.try_unwrap_io_result(result)
     }
 
+    fn stat(&mut self,
+        _path_op: OpTy<'tcx, Tag>,
+        buf_op: OpTy<'tcx, Tag>,
+    ) -> InterpResult<'tcx, i32> {
+        let this = self.eval_context_mut();
+
+        let buf = this.deref_operand(buf_op)?;
+
+        let dev_t_layout = this.libc_ty_layout("dev_t")?;
+        let mode_t_layout = this.libc_ty_layout("mode_t")?;
+        let nlink_t_layout = this.libc_ty_layout("nlink_t")?;
+        let ino_t_layout = this.libc_ty_layout("ino_t")?;
+        let uid_t_layout = this.libc_ty_layout("uid_t")?;
+        let gid_t_layout = this.libc_ty_layout("gid_t")?;
+        let time_t_layout = this.libc_ty_layout("time_t")?;
+        let long_layout = this.libc_ty_layout("c_long")?;
+        let off_t_layout = this.libc_ty_layout("off_t")?;
+        let blkcnt_t_layout = this.libc_ty_layout("blkcnt_t")?;
+        let blksize_t_layout = this.libc_ty_layout("blksize_t")?;
+        let uint32_t_layout = this.libc_ty_layout("uint32_t")?;
+
+        let imms = [
+            immty_from_uint_checked(0u128, dev_t_layout)?, // st_dev
+            immty_from_uint_checked(0u128, mode_t_layout)?, // st_mode
+            immty_from_uint_checked(0u128, nlink_t_layout)?, // st_nlink
+            immty_from_uint_checked(0u128, ino_t_layout)?, // st_ino
+            immty_from_uint_checked(0u128, uid_t_layout)?, // st_uid
+            immty_from_uint_checked(0u128, gid_t_layout)?, // st_gid
+            immty_from_uint_checked(0u128, dev_t_layout)?, // st_rdev
+            immty_from_uint_checked(0u128, time_t_layout)?, // st_atime
+            immty_from_uint_checked(0u128, long_layout)?, // st_atime_nsec
+            immty_from_uint_checked(0u128, time_t_layout)?, // st_mtime
+            immty_from_uint_checked(0u128, long_layout)?, // st_mtime_nsec
+            immty_from_uint_checked(0u128, time_t_layout)?, // st_ctime
+            immty_from_uint_checked(0u128, long_layout)?, // st_ctime_nsec
+            immty_from_uint_checked(0u128, time_t_layout)?, // st_birthtime
+            immty_from_uint_checked(0u128, long_layout)?, // st_birthtime_nsec
+            immty_from_uint_checked(0u128, off_t_layout)?, // st_size
+            immty_from_uint_checked(0u128, blkcnt_t_layout)?, // st_blocks
+            immty_from_uint_checked(0u128, blksize_t_layout)?, // st_blksize
+            immty_from_uint_checked(0u128, uint32_t_layout)?, // st_flags
+            immty_from_uint_checked(0u128, uint32_t_layout)?, // st_gen
+        ];
+
+        this.write_packed_immediates(&buf, &imms)?;
+
+        Ok(0)
+    }
+
     fn statx(
         &mut self,
         dirfd_op: OpTy<'tcx, Tag>,    // Should be an `int`

tests/run-pass/fs.rs

@@ -5,7 +5,6 @@ use std::fs::{File, remove_file};
 use std::io::{Read, Write, ErrorKind, Result};
 use std::path::{PathBuf, Path};
 
-#[cfg(target_os = "linux")]
 fn test_metadata(bytes: &[u8], path: &Path) -> Result<()> {
     // Test that the file metadata is correct.
     let metadata = path.metadata()?;
@@ -16,12 +15,6 @@ fn test_metadata(bytes: &[u8], path: &Path) -> Result<()> {
     Ok(())
 }
 
-// FIXME: Implement stat64 for macos.
-#[cfg(not(target_os = "linux"))]
-fn test_metadata(_bytes: &[u8], _path: &Path) -> Result<()> {
-    Ok(())
-}
-
 fn main() {
     let tmp = std::env::temp_dir();
     let filename = PathBuf::from("miri_test_fs.txt");