Auto merge of rust-lang#124140 - workingjubilee:rollup-wrub705, r=wor…

…kingjubilee

Rollup of 6 pull requests

Successful merges:

 - rust-lang#117919 (Introduce perma-unstable `wasm-c-abi` flag)
 - rust-lang#123571 (Correctly change type when adding adjustments on top of `NeverToAny`)
 - rust-lang#123752 (Properly handle emojis as literal prefix in macros)
 - rust-lang#123980 ( Add an opt-in to store incoming edges in `VecGraph` + misc)
 - rust-lang#124110 (Fix negating `f16` and `f128` constants)
 - rust-lang#124116 (when suggesting RUST_BACKTRACE=1, add a special note for Miri's env var isolation)

r? `@ghost`
`@rustbot` modify labels: rollup

compiler/rustc_codegen_gcc/src/builder.rs

@@ -31,7 +31,7 @@ use rustc_span::Span;
 use rustc_target::abi::{
     self, call::FnAbi, Align, HasDataLayout, Size, TargetDataLayout, WrappingRange,
 };
-use rustc_target::spec::{HasTargetSpec, Target};
+use rustc_target::spec::{HasTargetSpec, HasWasmCAbiOpt, Target, WasmCAbi};
 
 use crate::common::{type_is_pointer, SignType, TypeReflection};
 use crate::context::CodegenCx;
@@ -2352,6 +2352,12 @@ impl<'tcx> HasTargetSpec for Builder<'_, '_, 'tcx> {
     }
 }
 
+impl<'tcx> HasWasmCAbiOpt for Builder<'_, '_, 'tcx> {
+    fn wasm_c_abi_opt(&self) -> WasmCAbi {
+        self.cx.wasm_c_abi_opt()
+    }
+}
+
 pub trait ToGccComp {
     fn to_gcc_comparison(&self) -> ComparisonOp;
 }

compiler/rustc_codegen_gcc/src/context.rs

@@ -20,7 +20,7 @@ use rustc_span::{source_map::respan, Span};
 use rustc_target::abi::{
     call::FnAbi, HasDataLayout, PointeeInfo, Size, TargetDataLayout, VariantIdx,
 };
-use rustc_target::spec::{HasTargetSpec, Target, TlsModel};
+use rustc_target::spec::{HasTargetSpec, HasWasmCAbiOpt, Target, TlsModel, WasmCAbi};
 
 use crate::callee::get_fn;
 use crate::common::SignType;
@@ -557,6 +557,12 @@ impl<'gcc, 'tcx> HasTargetSpec for CodegenCx<'gcc, 'tcx> {
     }
 }
 
+impl<'gcc, 'tcx> HasWasmCAbiOpt for CodegenCx<'gcc, 'tcx> {
+    fn wasm_c_abi_opt(&self) -> WasmCAbi {
+        self.tcx.sess.opts.unstable_opts.wasm_c_abi
+    }
+}
+
 impl<'gcc, 'tcx> LayoutOfHelpers<'tcx> for CodegenCx<'gcc, 'tcx> {
     type LayoutOfResult = TyAndLayout<'tcx>;
 

compiler/rustc_data_structures/src/graph/iterate/mod.rs

@@ -70,21 +70,21 @@ pub fn reverse_post_order<G: DirectedGraph + Successors>(
 }
 
 /// A "depth-first search" iterator for a directed graph.
-pub struct DepthFirstSearch<'graph, G>
+pub struct DepthFirstSearch<G>
 where
-    G: ?Sized + DirectedGraph + Successors,
+    G: DirectedGraph + Successors,
 {
-    graph: &'graph G,
+    graph: G,
     stack: Vec<G::Node>,
     visited: BitSet<G::Node>,
 }
 
-impl<'graph, G> DepthFirstSearch<'graph, G>
+impl<G> DepthFirstSearch<G>
 where
-    G: ?Sized + DirectedGraph + Successors,
+    G: DirectedGraph + Successors,
 {
-    pub fn new(graph: &'graph G) -> Self {
-        Self { graph, stack: vec![], visited: BitSet::new_empty(graph.num_nodes()) }
+    pub fn new(graph: G) -> Self {
+        Self { stack: vec![], visited: BitSet::new_empty(graph.num_nodes()), graph }
     }
 
     /// Version of `push_start_node` that is convenient for chained
@@ -125,9 +125,9 @@ where
     }
 }
 
-impl<G> std::fmt::Debug for DepthFirstSearch<'_, G>
+impl<G> std::fmt::Debug for DepthFirstSearch<G>
 where
-    G: ?Sized + DirectedGraph + Successors,
+    G: DirectedGraph + Successors,
 {
     fn fmt(&self, fmt: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let mut f = fmt.debug_set();
@@ -138,9 +138,9 @@ where
     }
 }
 
-impl<G> Iterator for DepthFirstSearch<'_, G>
+impl<G> Iterator for DepthFirstSearch<G>
 where
-    G: ?Sized + DirectedGraph + Successors,
+    G: DirectedGraph + Successors,
 {
     type Item = G::Node;
 

compiler/rustc_data_structures/src/graph/mod.rs

@@ -46,9 +46,35 @@ where
         .is_some()
 }
 
-pub fn depth_first_search<G>(graph: &G, from: G::Node) -> iterate::DepthFirstSearch<'_, G>
+pub fn depth_first_search<G>(graph: G, from: G::Node) -> iterate::DepthFirstSearch<G>
 where
-    G: ?Sized + Successors,
+    G: Successors,
 {
     iterate::DepthFirstSearch::new(graph).with_start_node(from)
 }
+
+pub fn depth_first_search_as_undirected<G>(
+    graph: G,
+    from: G::Node,
+) -> iterate::DepthFirstSearch<impl Successors<Node = G::Node>>
+where
+    G: Successors + Predecessors,
+{
+    struct AsUndirected<G>(G);
+
+    impl<G: DirectedGraph> DirectedGraph for AsUndirected<G> {
+        type Node = G::Node;
+
+        fn num_nodes(&self) -> usize {
+            self.0.num_nodes()
+        }
+    }
+
+    impl<G: Successors + Predecessors> Successors for AsUndirected<G> {
+        fn successors(&self, node: Self::Node) -> impl Iterator<Item = Self::Node> {
+            self.0.successors(node).chain(self.0.predecessors(node))
+        }
+    }
+
+    iterate::DepthFirstSearch::new(AsUndirected(graph)).with_start_node(from)
+}