Auto merge of #34315 - Manishearth:rollup, r=Manishearth

Rollup of 4 pull requests

- Successful merges: #34298, #34302, #34307, #34312
- Failed merges:

Author: bors

src/bootstrap/build/cc.rs

@@ -57,7 +57,9 @@ pub fn find(build: &mut Build) {
         let compiler = cfg.get_compiler();
         let ar = cc2ar(compiler.path(), target);
         build.verbose(&format!("CC_{} = {:?}", target, compiler.path()));
-        build.verbose(&format!("AR_{} = {:?}", target, ar));
+        if let Some(ref ar) = ar {
+            build.verbose(&format!("AR_{} = {:?}", target, ar));
+        }
         build.cc.insert(target.to_string(), (compiler, ar));
     }
 

src/bootstrap/build/mod.rs

@@ -119,7 +119,7 @@ pub struct Build {
     lldb_python_dir: Option<String>,
 
     // Runtime state filled in later on
-    cc: HashMap<String, (gcc::Tool, PathBuf)>,
+    cc: HashMap<String, (gcc::Tool, Option<PathBuf>)>,
     cxx: HashMap<String, gcc::Tool>,
     compiler_rt_built: RefCell<HashMap<String, PathBuf>>,
 }
@@ -549,7 +549,7 @@ impl Build {
         // FIXME: the guard against msvc shouldn't need to be here
         if !target.contains("msvc") {
             cargo.env(format!("CC_{}", target), self.cc(target))
-                 .env(format!("AR_{}", target), self.ar(target))
+                 .env(format!("AR_{}", target), self.ar(target).unwrap()) // only msvc is None
                  .env(format!("CFLAGS_{}", target), self.cflags(target).join(" "));
         }
 
@@ -825,8 +825,8 @@ impl Build {
     }
 
     /// Returns the path to the `ar` archive utility for the target specified.
-    fn ar(&self, target: &str) -> &Path {
-        &self.cc[target].1
+    fn ar(&self, target: &str) -> Option<&Path> {
+        self.cc[target].1.as_ref().map(|p| &**p)
     }
 
     /// Returns the path to the C++ compiler for the target specified, may panic

src/bootstrap/build/sanity.rs

@@ -70,7 +70,9 @@ pub fn check(build: &mut Build) {
     // also build some C++ shims for LLVM so we need a C++ compiler.
     for target in build.config.target.iter() {
         need_cmd(build.cc(target).as_ref());
-        need_cmd(build.ar(target).as_ref());
+        if let Some(ar) = build.ar(target) {
+            need_cmd(ar.as_ref());
+        }
     }
     for host in build.config.host.iter() {
         need_cmd(build.cxx(host).as_ref());

src/build_helper/lib.rs

@@ -39,20 +39,22 @@ pub fn gnu_target(target: &str) -> String {
     }
 }
 
-pub fn cc2ar(cc: &Path, target: &str) -> PathBuf {
-    if target.contains("musl") || target.contains("msvc") {
-        PathBuf::from("ar")
+pub fn cc2ar(cc: &Path, target: &str) -> Option<PathBuf> {
+    if target.contains("msvc") {
+        None
+    } else if target.contains("musl") {
+        Some(PathBuf::from("ar"))
     } else {
         let parent = cc.parent().unwrap();
         let file = cc.file_name().unwrap().to_str().unwrap();
         for suffix in &["gcc", "cc", "clang"] {
             if let Some(idx) = file.rfind(suffix) {
                 let mut file = file[..idx].to_owned();
                 file.push_str("ar");
-                return parent.join(&file);
+                return Some(parent.join(&file));
             }
         }
-        parent.join(file)
+        Some(parent.join(file))
     }
 }
 

src/liballoc_jemalloc/build.rs

@@ -43,7 +43,8 @@ fn main() {
     }
 
     let compiler = gcc::Config::new().get_compiler();
-    let ar = build_helper::cc2ar(compiler.path(), &target);
+    // only msvc returns None for ar so unwrap is okay
+    let ar = build_helper::cc2ar(compiler.path(), &target).unwrap();
     let cflags = compiler.args()
                          .iter()
                          .map(|s| s.to_str().unwrap())

src/librustc_mir/build/scope.rs

@@ -94,6 +94,7 @@ use rustc::ty::{Ty, TyCtxt};
 use rustc::mir::repr::*;
 use syntax::codemap::Span;
 use rustc_data_structures::indexed_vec::Idx;
+use rustc_data_structures::fnv::FnvHashMap;
 
 pub struct Scope<'tcx> {
     /// the scope-id within the scope_auxiliary
@@ -127,12 +128,8 @@ pub struct Scope<'tcx> {
     /// stage.
     free: Option<FreeData<'tcx>>,
 
-    /// The cached block for the cleanups-on-diverge path. This block
-    /// contains a block that will just do a RESUME to an appropriate
-    /// place. This block does not execute any of the drops or free:
-    /// each of those has their own cached-blocks, which will branch
-    /// to this point.
-    cached_block: Option<BasicBlock>
+    /// The cache for drop chain on “normal” exit into a particular BasicBlock.
+    cached_exits: FnvHashMap<(BasicBlock, CodeExtent), BasicBlock>,
 }
 
 struct DropData<'tcx> {
@@ -172,7 +169,7 @@ pub struct LoopScope {
     pub continue_block: BasicBlock,
     /// Block to branch into when the loop terminates (either by being `break`-en out from, or by
     /// having its condition to become false)
-    pub break_block: BasicBlock, // where to go on a `break
+    pub break_block: BasicBlock,
     /// Indicates the reachability of the break_block for this loop
     pub might_break: bool
 }
@@ -183,7 +180,7 @@ impl<'tcx> Scope<'tcx> {
     /// Should always be run for all inner scopes when a drop is pushed into some scope enclosing a
     /// larger extent of code.
     fn invalidate_cache(&mut self) {
-        self.cached_block = None;
+        self.cached_exits = FnvHashMap();
         for dropdata in &mut self.drops {
             dropdata.cached_block = None;
         }
@@ -192,7 +189,7 @@ impl<'tcx> Scope<'tcx> {
         }
     }
 
-    /// Returns the cached block for this scope.
+    /// Returns the cached entrypoint for diverging exit from this scope.
     ///
     /// Precondition: the caches must be fully filled (i.e. diverge_cleanup is called) in order for
     /// this method to work correctly.
@@ -270,7 +267,7 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
             extent: extent,
             drops: vec![],
             free: None,
-            cached_block: None,
+            cached_exits: FnvHashMap()
         });
         self.scope_auxiliary.push(ScopeAuxiliary {
             extent: extent,
@@ -314,13 +311,25 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
                                                       .unwrap_or_else(||{
             span_bug!(span, "extent {:?} does not enclose", extent)
         });
-
+        let len = self.scopes.len();
+        assert!(scope_count < len, "should not use `exit_scope` to pop ALL scopes");
         let tmp = self.get_unit_temp();
-        for (idx, ref scope) in self.scopes.iter().enumerate().rev().take(scope_count) {
-            unpack!(block = build_scope_drops(&mut self.cfg,
-                                              scope,
-                                              &self.scopes[..idx],
-                                              block));
+        {
+        let mut rest = &mut self.scopes[(len - scope_count)..];
+        while let Some((scope, rest_)) = {rest}.split_last_mut() {
+            rest = rest_;
+            block = if let Some(&e) = scope.cached_exits.get(&(target, extent)) {
+                self.cfg.terminate(block, scope.source_info(span),
+                                   TerminatorKind::Goto { target: e });
+                return;
+            } else {
+                let b = self.cfg.start_new_block();
+                self.cfg.terminate(block, scope.source_info(span),
+                                   TerminatorKind::Goto { target: b });
+                scope.cached_exits.insert((target, extent), b);
+                b
+            };
+            unpack!(block = build_scope_drops(&mut self.cfg, scope, rest, block));
             if let Some(ref free_data) = scope.free {
                 let next = self.cfg.start_new_block();
                 let free = build_free(self.hir.tcx(), &tmp, free_data, next);
@@ -331,14 +340,9 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
                 .postdoms
                 .push(self.cfg.current_location(block));
         }
-
-        assert!(scope_count < self.scopes.len(),
-                "should never use `exit_scope` to pop *ALL* scopes");
-        let scope = self.scopes.iter().rev().skip(scope_count)
-                                            .next()
-                                            .unwrap();
-        self.cfg.terminate(block,
-                           scope.source_info(span),
+        }
+        let scope = &self.scopes[len - scope_count];
+        self.cfg.terminate(block, scope.source_info(span),
                            TerminatorKind::Goto { target: target });
     }
 
@@ -506,10 +510,9 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
             resumeblk
         };
 
-        for scope in scopes {
+        for scope in scopes.iter_mut().filter(|s| !s.drops.is_empty() || s.free.is_some()) {
             target = build_diverge_scope(hir.tcx(), cfg, &unit_temp, scope, target);
         }
-
         Some(target)
     }
 
@@ -534,7 +537,7 @@ impl<'a, 'gcx, 'tcx> Builder<'a, 'gcx, 'tcx> {
         next_target.unit()
     }
 
-
+    /// Utility function for *non*-scope code to build their own drops
     pub fn build_drop_and_replace(&mut self,
                                   block: BasicBlock,
                                   span: Span,

src/librustc_save_analysis/data.rs

@@ -102,6 +102,8 @@ pub struct EnumData {
     pub qualname: String,
     pub span: Span,
     pub scope: NodeId,
+    pub variants: Vec<NodeId>,
+
 }
 
 /// Data for extern crates.
@@ -212,6 +214,7 @@ pub struct MethodData {
     pub span: Span,
     pub scope: NodeId,
     pub value: String,
+    pub decl_id: Option<DefId>,
 }
 
 /// Data for modules.
@@ -223,6 +226,7 @@ pub struct ModData {
     pub span: Span,
     pub scope: NodeId,
     pub filename: String,
+    pub items: Vec<NodeId>,
 }
 
 /// Data for a reference to a module.
@@ -242,7 +246,8 @@ pub struct StructData {
     pub ctor_id: NodeId,
     pub qualname: String,
     pub scope: NodeId,
-    pub value: String
+    pub value: String,
+    pub fields: Vec<NodeId>,
 }
 
 #[derive(Debug, RustcEncodable)]
@@ -263,7 +268,8 @@ pub struct TraitData {
     pub name: String,
     pub qualname: String,
     pub scope: NodeId,
-    pub value: String
+    pub value: String,
+    pub items: Vec<NodeId>,
 }
 
 #[derive(Debug, RustcEncodable)]
@@ -317,6 +323,7 @@ pub struct UseGlobData {
 #[derive(Debug, RustcEncodable)]
 pub struct VariableData {
     pub id: NodeId,
+    pub kind: VariableKind,
     pub name: String,
     pub qualname: String,
     pub span: Span,
@@ -325,6 +332,14 @@ pub struct VariableData {
     pub type_value: String,
 }
 
+#[derive(Debug, RustcEncodable)]
+pub enum VariableKind {
+    Static,
+    Const,
+    Local,
+    Field,
+}
+
 /// Data for the use of some item (e.g., the use of a local variable, which
 /// will refer to that variables declaration (by ref_id)).
 #[derive(Debug, RustcEncodable)]