Auto merge of rust-lang#83042 - JohnTitor:rollup-s8efv94, r=JohnTitor

Rollup of 11 pull requests

Successful merges:

 - rust-lang#80385 (Clarify what `Cell::replace` returns)
 - rust-lang#82571 (Rustdoc Json: Add tests for Reexports, and improve jsondocck)
 - rust-lang#82860 (Add `-Z unpretty` flag for the THIR)
 - rust-lang#82950 (convert slice doc link to intra-doc links)
 - rust-lang#82965 (Add spirv extension handling in compiletest)
 - rust-lang#82966 (update MSYS2 link in README)
 - rust-lang#82979 (Fix "run" button position in error index)
 - rust-lang#83001 (Ignore Vim swap files)
 - rust-lang#83003 (rustdoc: tweak the search index format)
 - rust-lang#83013 (Adjust some `#[cfg]`s to take non-Unix non-Windows operating systems into account)
 - rust-lang#83018 (Reintroduce accidentally deleted assertions.)

Failed merges:

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

Author: bors

.gitignore

@@ -7,6 +7,8 @@
 # configure your local ignore list.
 # FIXME: This needs cleanup.
 *~
+*.swp
+*.swo
 .#*
 .DS_Store
 .cproject

Cargo.lock

@@ -3870,13 +3870,15 @@ dependencies = [
  "rustc_metadata",
  "rustc_middle",
  "rustc_mir",
+ "rustc_mir_build",
  "rustc_parse",
  "rustc_plugin_impl",
  "rustc_save_analysis",
  "rustc_serialize",
  "rustc_session",
  "rustc_span",
  "rustc_target",
+ "rustc_typeck",
  "tracing",
  "tracing-subscriber",
  "tracing-tree",

README.md

@@ -90,7 +90,7 @@ build.
 
 [MSYS2][msys2] can be used to easily build Rust on Windows:
 
-[msys2]: https://msys2.github.io/
+[msys2]: https://www.msys2.org/
 
 1. Grab the latest [MSYS2 installer][msys2] and go through the installer.
 

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -711,7 +711,7 @@ fn link_natively<'a, B: ArchiveBuilder<'a>>(
             status.signal() == Some(libc::SIGILL)
         }
 
-        #[cfg(windows)]
+        #[cfg(not(unix))]
         fn is_illegal_instruction(_status: &ExitStatus) -> bool {
             false
         }
@@ -1198,7 +1198,7 @@ fn exec_linker(
     flush_linked_file(&output, out_filename)?;
     return output;
 
-    #[cfg(unix)]
+    #[cfg(not(windows))]
     fn flush_linked_file(_: &io::Result<Output>, _: &Path) -> io::Result<()> {
         Ok(())
     }
@@ -1238,6 +1238,11 @@ fn exec_linker(
         err.raw_os_error() == Some(ERROR_FILENAME_EXCED_RANGE)
     }
 
+    #[cfg(not(any(unix, windows)))]
+    fn command_line_too_big(_: &io::Error) -> bool {
+        false
+    }
+
     struct Escape<'a> {
         arg: &'a str,
         is_like_msvc: bool,

compiler/rustc_driver/Cargo.toml

@@ -34,6 +34,8 @@ rustc_interface = { path = "../rustc_interface" }
 rustc_serialize = { path = "../rustc_serialize" }
 rustc_ast = { path = "../rustc_ast" }
 rustc_span = { path = "../rustc_span" }
+rustc_mir_build = { path = "../rustc_mir_build" }
+rustc_typeck = { path = "../rustc_typeck" }
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version = "0.3", features = ["consoleapi", "debugapi", "processenv"] }

compiler/rustc_driver/src/pretty.rs

@@ -9,12 +9,14 @@ use rustc_hir_pretty as pprust_hir;
 use rustc_middle::hir::map as hir_map;
 use rustc_middle::ty::{self, TyCtxt};
 use rustc_mir::util::{write_mir_graphviz, write_mir_pretty};
+use rustc_mir_build::thir;
 use rustc_session::config::{Input, PpAstTreeMode, PpHirMode, PpMode, PpSourceMode};
 use rustc_session::Session;
 use rustc_span::symbol::Ident;
 use rustc_span::FileName;
 
 use std::cell::Cell;
+use std::fmt::Write;
 use std::path::Path;
 
 pub use self::PpMode::*;
@@ -469,6 +471,21 @@ pub fn print_after_hir_lowering<'tcx>(
             format!("{:#?}", krate)
         }),
 
+        ThirTree => {
+            let mut out = String::new();
+            abort_on_err(rustc_typeck::check_crate(tcx), tcx.sess);
+            debug!("pretty printing THIR tree");
+            for did in tcx.body_owners() {
+                let hir = tcx.hir();
+                let body = hir.body(hir.body_owned_by(hir.local_def_id_to_hir_id(did)));
+                let arena = thir::Arena::default();
+                let thir =
+                    thir::build_thir(tcx, ty::WithOptConstParam::unknown(did), &arena, &body.value);
+                let _ = writeln!(out, "{:?}:\n{:#?}\n", did, thir);
+            }
+            out
+        }
+
         _ => unreachable!(),
     };
 

compiler/rustc_mir_build/src/build/mod.rs

@@ -1,7 +1,6 @@
 use crate::build;
 use crate::build::scope::DropKind;
-use crate::thir::cx::build_thir;
-use crate::thir::{Arena, BindingMode, Expr, LintLevel, Pat, PatKind};
+use crate::thir::{build_thir, Arena, BindingMode, Expr, LintLevel, Pat, PatKind};
 use rustc_attr::{self as attr, UnwindAttr};
 use rustc_errors::ErrorReported;
 use rustc_hir as hir;

compiler/rustc_mir_build/src/lib.rs

@@ -20,7 +20,7 @@ extern crate rustc_middle;
 
 mod build;
 mod lints;
-mod thir;
+pub mod thir;
 
 use rustc_middle::ty::query::Providers;
 

compiler/rustc_mir_build/src/thir/constant.rs

@@ -1,3 +1,4 @@
+use rustc_apfloat::Float;
 use rustc_ast as ast;
 use rustc_middle::mir::interpret::{
     Allocation, ConstValue, LitToConstError, LitToConstInput, Scalar,
@@ -61,20 +62,40 @@ fn parse_float<'tcx>(num: Symbol, fty: ty::FloatTy, neg: bool) -> Result<ConstVa
     use rustc_apfloat::ieee::{Double, Single};
     let scalar = match fty {
         ty::FloatTy::F32 => {
-            num.parse::<f32>().map_err(|_| ())?;
+            let rust_f = num.parse::<f32>().map_err(|_| ())?;
             let mut f = num.parse::<Single>().unwrap_or_else(|e| {
                 panic!("apfloat::ieee::Single failed to parse `{}`: {:?}", num, e)
             });
+            assert!(
+                u128::from(rust_f.to_bits()) == f.to_bits(),
+                "apfloat::ieee::Single gave different result for `{}`: \
+                 {}({:#x}) vs Rust's {}({:#x})",
+                rust_f,
+                f,
+                f.to_bits(),
+                Single::from_bits(rust_f.to_bits().into()),
+                rust_f.to_bits()
+            );
             if neg {
                 f = -f;
             }
             Scalar::from_f32(f)
         }
         ty::FloatTy::F64 => {
-            num.parse::<f64>().map_err(|_| ())?;
+            let rust_f = num.parse::<f64>().map_err(|_| ())?;
             let mut f = num.parse::<Double>().unwrap_or_else(|e| {
                 panic!("apfloat::ieee::Double failed to parse `{}`: {:?}", num, e)
             });
+            assert!(
+                u128::from(rust_f.to_bits()) == f.to_bits(),
+                "apfloat::ieee::Double gave different result for `{}`: \
+                 {}({:#x}) vs Rust's {}({:#x})",
+                rust_f,
+                f,
+                f.to_bits(),
+                Double::from_bits(rust_f.to_bits().into()),
+                rust_f.to_bits()
+            );
             if neg {
                 f = -f;
             }

compiler/rustc_mir_build/src/thir/cx/mod.rs

@@ -14,7 +14,7 @@ use rustc_middle::middle::region;
 use rustc_middle::mir::interpret::{LitToConstError, LitToConstInput};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 
-crate fn build_thir<'thir, 'tcx>(
+pub fn build_thir<'thir, 'tcx>(
     tcx: TyCtxt<'tcx>,
     owner_def: ty::WithOptConstParam<LocalDefId>,
     arena: &'thir Arena<'thir, 'tcx>,