Merge pull request #93 from oli-obk/always_encode_mir

rustup to rustc 1.15.0-dev (ace092f56 2016-12-13)

Author: solson

src/bin/miri.rs

@@ -10,7 +10,7 @@ extern crate syntax;
 #[macro_use] extern crate log;
 
 use rustc::session::Session;
-use rustc_driver::{CompilerCalls, Compilation};
+use rustc_driver::CompilerCalls;
 use rustc_driver::driver::{CompileState, CompileController};
 use syntax::ast::{MetaItemKind, NestedMetaItemKind};
 
@@ -21,7 +21,6 @@ impl<'a> CompilerCalls<'a> for MiriCompilerCalls {
         let mut control = CompileController::basic();
         control.after_hir_lowering.callback = Box::new(after_hir_lowering);
         control.after_analysis.callback = Box::new(after_analysis);
-        control.after_analysis.stop = Compilation::Stop;
         control
     }
 }
@@ -35,14 +34,16 @@ fn after_analysis(state: &mut CompileState) {
     state.session.abort_if_errors();
 
     let tcx = state.tcx.unwrap();
-    let (entry_node_id, _) = state.session.entry_fn.borrow()
-        .expect("no main or start function found");
-    let entry_def_id = tcx.map.local_def_id(entry_node_id);
-    let limits = resource_limits_from_attributes(state);
-    miri::run_mir_passes(tcx);
-    miri::eval_main(tcx, entry_def_id, limits);
-
-    state.session.abort_if_errors();
+    if let Some((entry_node_id, _)) = *state.session.entry_fn.borrow() {
+        let entry_def_id = tcx.map.local_def_id(entry_node_id);
+        let limits = resource_limits_from_attributes(state);
+        miri::run_mir_passes(tcx);
+        miri::eval_main(tcx, entry_def_id, limits);
+
+        state.session.abort_if_errors();
+    } else {
+        println!("no main function found, assuming auxiliary build");
+    }
 }
 
 fn resource_limits_from_attributes(state: &CompileState) -> miri::ResourceLimits {
@@ -134,6 +135,7 @@ fn main() {
         args.push(sysroot_flag);
         args.push(find_sysroot());
     }
+    args.push("-Zalways-encode-mir".to_owned());
 
     rustc_driver::run_compiler(&args, &mut MiriCompilerCalls, None, None);
 }

src/error.rs

@@ -11,6 +11,7 @@ use syntax::codemap::Span;
 pub enum EvalError<'tcx> {
     FunctionPointerTyMismatch(Abi, &'tcx FnSig<'tcx>, &'tcx BareFnTy<'tcx>),
     NoMirFor(String),
+    UnterminatedCString(Pointer),
     DanglingPointerDeref,
     InvalidMemoryAccess,
     InvalidFunctionPointer,
@@ -119,6 +120,8 @@ impl<'tcx> Error for EvalError<'tcx> {
                 "tried to deallocate frozen memory",
             EvalError::Layout(_) =>
                 "rustc layout computation failed",
+            EvalError::UnterminatedCString(_) =>
+                "attempted to get length of a null terminated string, but no null found before end of allocation",
         }
     }
 

src/memory.rs

@@ -530,6 +530,22 @@ impl<'a, 'tcx> Memory<'a, 'tcx> {
         Ok(())
     }
 
+    pub fn read_c_str(&self, ptr: Pointer) -> EvalResult<'tcx, &[u8]> {
+        let alloc = self.get(ptr.alloc_id)?;
+        assert_eq!(ptr.offset as usize as u64, ptr.offset);
+        let offset = ptr.offset as usize;
+        match alloc.bytes[offset..].iter().position(|&c| c == 0) {
+            Some(size) => {
+                if self.relocations(ptr, (size + 1) as u64)?.count() != 0 {
+                    return Err(EvalError::ReadPointerAsBytes);
+                }
+                self.check_defined(ptr, (size + 1) as u64)?;
+                Ok(&alloc.bytes[offset..offset + size])
+            },
+            None => Err(EvalError::UnterminatedCString(ptr)),
+        }
+    }
+
     pub fn read_bytes(&self, ptr: Pointer, size: u64) -> EvalResult<'tcx, &[u8]> {
         self.get_bytes(ptr, size, 1)
     }

src/terminator/intrinsic.rs

@@ -57,6 +57,7 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
             }
 
             "atomic_load" |
+            "atomic_load_relaxed" |
             "atomic_load_acq" |
             "volatile_load" => {
                 let ty = substs.type_at(0);

src/terminator/mod.rs

@@ -90,7 +90,16 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
                     ty::TyFnPtr(bare_fn_ty) => {
                         let fn_ptr = self.eval_operand_to_primval(func)?.to_ptr();
                         let (def_id, substs, abi, sig) = self.memory.get_fn(fn_ptr.alloc_id)?;
-                        if abi != bare_fn_ty.abi || sig != bare_fn_ty.sig.skip_binder() {
+                        let bare_sig = self.tcx.erase_late_bound_regions_and_normalize(&bare_fn_ty.sig);
+                        let bare_sig = self.tcx.erase_regions(&bare_sig);
+                        // transmuting function pointers in miri is fine as long as the number of
+                        // arguments and the abi don't change.
+                        // FIXME: also check the size of the arguments' type and the return type
+                        // Didn't get it to work, since that triggers an assertion in rustc which
+                        // checks whether the type has escaping regions
+                        if abi != bare_fn_ty.abi ||
+                           sig.variadic != bare_sig.variadic ||
+                           sig.inputs().len() != bare_sig.inputs().len() {
                             return Err(EvalError::FunctionPointerTyMismatch(abi, sig, bare_fn_ty));
                         }
                         self.eval_fn_call(def_id, substs, bare_fn_ty, destination, args,
@@ -189,15 +198,15 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
         use syntax::abi::Abi;
         match fn_ty.abi {
             Abi::RustIntrinsic => {
-                let ty = fn_ty.sig.0.output;
+                let ty = fn_ty.sig.0.output();
                 let layout = self.type_layout(ty)?;
                 let (ret, target) = destination.unwrap();
                 self.call_intrinsic(def_id, substs, arg_operands, ret, ty, layout, target)?;
                 Ok(())
             }
 
             Abi::C => {
-                let ty = fn_ty.sig.0.output;
+                let ty = fn_ty.sig.0.output();
                 let (ret, target) = destination.unwrap();
                 self.call_c_abi(def_id, arg_operands, ret, ty)?;
                 self.goto_block(target);
@@ -320,11 +329,6 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
             .collect();
         let args = args_res?;
 
-        if link_name.starts_with("pthread_") {
-            warn!("ignoring C ABI call: {}", link_name);
-            return Ok(());
-        }
-
         let usize = self.tcx.types.usize;
 
         match &link_name[..] {
@@ -371,6 +375,37 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
                 self.write_primval(dest, PrimVal::new(result as u64), dest_ty)?;
             }
 
+            "memchr" => {
+                let ptr = args[0].read_ptr(&self.memory)?;
+                let val = self.value_to_primval(args[1], usize)?.to_u64() as u8;
+                let num = self.value_to_primval(args[2], usize)?.to_u64();
+                if let Some(idx) = self.memory.read_bytes(ptr, num)?.iter().position(|&c| c == val) {
+                    let new_ptr = ptr.offset(idx as u64);
+                    self.write_value(Value::ByVal(PrimVal::from_ptr(new_ptr)), dest, dest_ty)?;
+                } else {
+                    self.write_value(Value::ByVal(PrimVal::new(0)), dest, dest_ty)?;
+                }
+            }
+
+            "getenv" => {
+                {
+                    let name_ptr = args[0].read_ptr(&self.memory)?;
+                    let name = self.memory.read_c_str(name_ptr)?;
+                    info!("ignored env var request for `{:?}`", ::std::str::from_utf8(name));
+                }
+                self.write_value(Value::ByVal(PrimVal::new(0)), dest, dest_ty)?;
+            }
+
+            // unix panic code inside libstd will read the return value of this function
+            "pthread_rwlock_rdlock" => {
+                self.write_primval(dest, PrimVal::new(0), dest_ty)?;
+            }
+
+            link_name if link_name.starts_with("pthread_") => {
+                warn!("ignoring C ABI call: {}", link_name);
+                return Ok(());
+            },
+
             _ => {
                 return Err(EvalError::Unimplemented(format!("can't call C ABI function: {}", link_name)));
             }
@@ -520,7 +555,7 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
                     let offset = idx * self.memory.pointer_size();
                     let fn_ptr = self.memory.read_ptr(vtable.offset(offset))?;
                     let (def_id, substs, _abi, sig) = self.memory.get_fn(fn_ptr.alloc_id)?;
-                    *first_ty = sig.inputs[0];
+                    *first_ty = sig.inputs()[0];
                     Ok((def_id, substs, Vec::new()))
                 } else {
                     Err(EvalError::VtableForArgumentlessMethod)
@@ -664,7 +699,7 @@ impl<'a, 'tcx> EvalContext<'a, 'tcx> {
                 // some values don't need to call a drop impl, so the value is null
                 if drop_fn != Pointer::from_int(0) {
                     let (def_id, substs, _abi, sig) = self.memory.get_fn(drop_fn.alloc_id)?;
-                    let real_ty = sig.inputs[0];
+                    let real_ty = sig.inputs()[0];
                     self.drop(Lvalue::from_ptr(ptr), real_ty, drop)?;
                     drop.push((def_id, Value::ByVal(PrimVal::from_ptr(ptr)), substs));
                 } else {

tests/compiletest.rs

@@ -27,6 +27,15 @@ fn run_pass() {
     compiletest::run_tests(&config);
 }
 
+fn miri_pass(path: &str, target: &str) {
+    let mut config = compiletest::default_config();
+    config.mode = "mir-opt".parse().expect("Invalid mode");
+    config.src_base = PathBuf::from(path);
+    config.target = target.to_owned();
+    config.rustc_path = PathBuf::from("target/debug/miri");
+    compiletest::run_tests(&config);
+}
+
 fn for_all_targets<F: FnMut(String)>(sysroot: &str, mut f: F) {
     for target in std::fs::read_dir(format!("{}/lib/rustlib/", sysroot)).unwrap() {
         let target = target.unwrap();
@@ -57,65 +66,10 @@ fn compile_test() {
     };
     run_pass();
     for_all_targets(&sysroot, |target| {
-        let files = std::fs::read_dir("tests/run-pass").unwrap();
-        let files: Box<Iterator<Item=_>> = if let Ok(path) = std::env::var("MIRI_RUSTC_TEST") {
-            Box::new(files.chain(std::fs::read_dir(path).unwrap()))
-        } else {
-            Box::new(files)
-        };
-        let mut mir_not_found = 0;
-        let mut crate_not_found = 0;
-        let mut success = 0;
-        let mut failed = 0;
-        for file in files {
-            let file = file.unwrap();
-            let path = file.path();
-
-            if !file.metadata().unwrap().is_file() || !path.to_str().unwrap().ends_with(".rs") {
-                continue;
-            }
-
-            let stderr = std::io::stderr();
-            write!(stderr.lock(), "test [miri-pass] {} ... ", path.display()).unwrap();
-            let mut cmd = std::process::Command::new("target/debug/miri");
-            cmd.arg(path);
-            cmd.arg(format!("--target={}", target));
-            let libs = Path::new(&sysroot).join("lib");
-            let sysroot = libs.join("rustlib").join(&target).join("lib");
-            let paths = std::env::join_paths(&[libs, sysroot]).unwrap();
-            cmd.env(compiletest::procsrv::dylib_env_var(), paths);
-
-            match cmd.output() {
-                Ok(ref output) if output.status.success() => {
-                    success += 1;
-                    writeln!(stderr.lock(), "ok").unwrap()
-                },
-                Ok(output) => {
-                    let output_err = std::str::from_utf8(&output.stderr).unwrap();
-                    if let Some(text) = output_err.splitn(2, "no mir for `").nth(1) {
-                        mir_not_found += 1;
-                        let end = text.find('`').unwrap();
-                        writeln!(stderr.lock(), "NO MIR FOR `{}`", &text[..end]).unwrap();
-                    } else if let Some(text) = output_err.splitn(2, "can't find crate for `").nth(1) {
-                        crate_not_found += 1;
-                        let end = text.find('`').unwrap();
-                        writeln!(stderr.lock(), "CAN'T FIND CRATE FOR `{}`", &text[..end]).unwrap();
-                    } else {
-                        failed += 1;
-                        writeln!(stderr.lock(), "FAILED with exit code {:?}", output.status.code()).unwrap();
-                        writeln!(stderr.lock(), "stdout: \n {}", std::str::from_utf8(&output.stdout).unwrap()).unwrap();
-                        writeln!(stderr.lock(), "stderr: \n {}", output_err).unwrap();
-                    }
-                }
-                Err(e) => {
-                    writeln!(stderr.lock(), "FAILED: {}", e).unwrap();
-                    panic!("failed to execute miri");
-                },
-            }
+        miri_pass("tests/run-pass", &target);
+        if let Ok(path) = std::env::var("MIRI_RUSTC_TEST") {
+            miri_pass(&path, &target);
         }
-        let stderr = std::io::stderr();
-        writeln!(stderr.lock(), "{} success, {} mir not found, {} crate not found, {} failed", success, mir_not_found, crate_not_found, failed).unwrap();
-        assert_eq!(failed, 0, "some tests failed");
     });
     compile_fail(&sysroot);
 }

tests/run-pass/aux_test.rs

@@ -0,0 +1,7 @@
+// aux-build:dep.rs
+
+extern crate dep;
+
+fn main() {
+    dep::foo();
+}

tests/run-pass/auxiliary/dep.rs

@@ -0,0 +1 @@
+pub fn foo() {}