Auto merge of rust-lang#78697 - JohnTitor:rollup-q0fchpv, r=JohnTitor

Rollup of 8 pull requests

Successful merges:

 - rust-lang#78376 (Treat trailing semicolon as a statement in macro call)
 - rust-lang#78400 (Fix unindent in doc comments)
 - rust-lang#78575 (Add a test for compiletest rustc-env & unset-rustc-env directives)
 - rust-lang#78616 (Document -Zinstrument-coverage)
 - rust-lang#78663 (Fix ICE when a future-incompat-report has its command-line level capped)
 - rust-lang#78664 (Fix intrinsic size_of stable link)
 - rust-lang#78668 (inliner: Remove redundant loop)
 - rust-lang#78676 (add mipsel-unknown-none target)

Failed merges:

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

compiler/rustc_ast/src/ast.rs

@@ -905,6 +905,13 @@ pub struct Stmt {
 }
 
 impl Stmt {
+    pub fn has_trailing_semicolon(&self) -> bool {
+        match &self.kind {
+            StmtKind::Semi(_) => true,
+            StmtKind::MacCall(mac) => matches!(mac.style, MacStmtStyle::Semicolon),
+            _ => false,
+        }
+    }
     pub fn add_trailing_semicolon(mut self) -> Self {
         self.kind = match self.kind {
             StmtKind::Expr(expr) => StmtKind::Semi(expr),

compiler/rustc_expand/src/placeholders.rs

@@ -310,8 +310,44 @@ impl<'a, 'b> MutVisitor for PlaceholderExpander<'a, 'b> {
         };
 
         if style == ast::MacStmtStyle::Semicolon {
+            // Implement the proposal described in
+            // https://github.com/rust-lang/rust/issues/61733#issuecomment-509626449
+            //
+            // The macro invocation expands to the list of statements.
+            // If the list of statements is empty, then 'parse'
+            // the trailing semicolon on the original invocation
+            // as an empty statement. That is:
+            //
+            // `empty();` is parsed as a single `StmtKind::Empty`
+            //
+            // If the list of statements is non-empty, see if the
+            // final statement alreayd has a trailing semicolon.
+            //
+            // If it doesn't have a semicolon, then 'parse' the trailing semicolon
+            // from the invocation as part of the final statement,
+            // using `stmt.add_trailing_semicolon()`
+            //
+            // If it does have a semicolon, then 'parse' the trailing semicolon
+            // from the invocation as a new StmtKind::Empty
+
+            // FIXME: We will need to preserve the original
+            // semicolon token and span as part of #15701
+            let empty_stmt = ast::Stmt {
+                id: ast::DUMMY_NODE_ID,
+                kind: ast::StmtKind::Empty,
+                span: DUMMY_SP,
+                tokens: None,
+            };
+
             if let Some(stmt) = stmts.pop() {
-                stmts.push(stmt.add_trailing_semicolon());
+                if stmt.has_trailing_semicolon() {
+                    stmts.push(stmt);
+                    stmts.push(empty_stmt);
+                } else {
+                    stmts.push(stmt.add_trailing_semicolon());
+                }
+            } else {
+                stmts.push(empty_stmt);
             }
         }
 

compiler/rustc_lint/src/levels.rs

@@ -74,6 +74,7 @@ impl<'s> LintLevelsBuilder<'s> {
 
         for &(ref lint_name, level) in &sess.opts.lint_opts {
             store.check_lint_name_cmdline(sess, &lint_name, level);
+            let orig_level = level;
 
             // If the cap is less than this specified level, e.g., if we've got
             // `--cap-lints allow` but we've also got `-D foo` then we ignore
@@ -88,7 +89,7 @@ impl<'s> LintLevelsBuilder<'s> {
             };
             for id in ids {
                 self.check_gated_lint(id, DUMMY_SP);
-                let src = LintSource::CommandLine(lint_flag_val);
+                let src = LintSource::CommandLine(lint_flag_val, orig_level);
                 specs.insert(id, (level, src));
             }
         }
@@ -123,7 +124,7 @@ impl<'s> LintLevelsBuilder<'s> {
                             diag_builder.note(&rationale.as_str());
                         }
                     }
-                    LintSource::CommandLine(_) => {
+                    LintSource::CommandLine(_, _) => {
                         diag_builder.note("`forbid` lint level was set on command line");
                     }
                 }
@@ -422,7 +423,7 @@ impl<'s> LintLevelsBuilder<'s> {
             let forbidden_lint_name = match forbid_src {
                 LintSource::Default => id.to_string(),
                 LintSource::Node(name, _, _) => name.to_string(),
-                LintSource::CommandLine(name) => name.to_string(),
+                LintSource::CommandLine(name, _) => name.to_string(),
             };
             let (lint_attr_name, lint_attr_span) = match *src {
                 LintSource::Node(name, span, _) => (name, span),
@@ -446,7 +447,7 @@ impl<'s> LintLevelsBuilder<'s> {
                         diag_builder.note(&rationale.as_str());
                     }
                 }
-                LintSource::CommandLine(_) => {
+                LintSource::CommandLine(_, _) => {
                     diag_builder.note("`forbid` lint level was set on command line");
                 }
             }

compiler/rustc_lint/src/redundant_semicolon.rs

@@ -42,6 +42,11 @@ impl EarlyLintPass for RedundantSemicolons {
 
 fn maybe_lint_redundant_semis(cx: &EarlyContext<'_>, seq: &mut Option<(Span, bool)>) {
     if let Some((span, multiple)) = seq.take() {
+        // FIXME: Find a better way of ignoring the trailing
+        // semicolon from macro expansion
+        if span == rustc_span::DUMMY_SP {
+            return;
+        }
         cx.struct_span_lint(REDUNDANT_SEMICOLONS, span, |lint| {
             let (msg, rem) = if multiple {
                 ("unnecessary trailing semicolons", "remove these semicolons")

compiler/rustc_middle/src/lint.rs

@@ -22,23 +22,25 @@ pub enum LintSource {
     Node(Symbol, Span, Option<Symbol> /* RFC 2383 reason */),
 
     /// Lint level was set by a command-line flag.
-    CommandLine(Symbol),
+    /// The provided `Level` is the level specified on the command line -
+    /// the actual level may be lower due to `--cap-lints`
+    CommandLine(Symbol, Level),
 }
 
 impl LintSource {
     pub fn name(&self) -> Symbol {
         match *self {
             LintSource::Default => symbol::kw::Default,
             LintSource::Node(name, _, _) => name,
-            LintSource::CommandLine(name) => name,
+            LintSource::CommandLine(name, _) => name,
         }
     }
 
     pub fn span(&self) -> Span {
         match *self {
             LintSource::Default => DUMMY_SP,
             LintSource::Node(_, span, _) => span,
-            LintSource::CommandLine(_) => DUMMY_SP,
+            LintSource::CommandLine(_, _) => DUMMY_SP,
         }
     }
 }
@@ -279,12 +281,12 @@ pub fn struct_lint_level<'s, 'd>(
                     &format!("`#[{}({})]` on by default", level.as_str(), name),
                 );
             }
-            LintSource::CommandLine(lint_flag_val) => {
-                let flag = match level {
+            LintSource::CommandLine(lint_flag_val, orig_level) => {
+                let flag = match orig_level {
                     Level::Warn => "-W",
                     Level::Deny => "-D",
                     Level::Forbid => "-F",
-                    Level::Allow => panic!(),
+                    Level::Allow => "-A",
                 };
                 let hyphen_case_lint_name = name.replace("_", "-");
                 if lint_flag_val.as_str() == name {

compiler/rustc_mir/src/transform/inline.rs

@@ -93,96 +93,79 @@ impl Inliner<'tcx> {
             return;
         }
 
-        let mut local_change;
         let mut changed = false;
+        while let Some(callsite) = callsites.pop_front() {
+            debug!("checking whether to inline callsite {:?}", callsite);
 
-        loop {
-            local_change = false;
-            while let Some(callsite) = callsites.pop_front() {
-                debug!("checking whether to inline callsite {:?}", callsite);
-
-                if let InstanceDef::Item(_) = callsite.callee.def {
-                    if !self.tcx.is_mir_available(callsite.callee.def_id()) {
-                        debug!(
-                            "checking whether to inline callsite {:?} - MIR unavailable",
-                            callsite,
-                        );
-                        continue;
-                    }
+            if let InstanceDef::Item(_) = callsite.callee.def {
+                if !self.tcx.is_mir_available(callsite.callee.def_id()) {
+                    debug!("checking whether to inline callsite {:?} - MIR unavailable", callsite,);
+                    continue;
                 }
+            }
 
-                let callee_body = if let Some(callee_def_id) = callsite.callee.def_id().as_local() {
-                    let callee_hir_id = self.tcx.hir().local_def_id_to_hir_id(callee_def_id);
-                    // Avoid a cycle here by only using `instance_mir` only if we have
-                    // a lower `HirId` than the callee. This ensures that the callee will
-                    // not inline us. This trick only works without incremental compilation.
-                    // So don't do it if that is enabled. Also avoid inlining into generators,
-                    // since their `optimized_mir` is used for layout computation, which can
-                    // create a cycle, even when no attempt is made to inline the function
-                    // in the other direction.
-                    if !self.tcx.dep_graph.is_fully_enabled()
-                        && self_hir_id < callee_hir_id
-                        && caller_body.generator_kind.is_none()
-                    {
-                        self.tcx.instance_mir(callsite.callee.def)
-                    } else {
-                        continue;
-                    }
-                } else {
-                    // This cannot result in a cycle since the callee MIR is from another crate
-                    // and is already optimized.
+            let callee_body = if let Some(callee_def_id) = callsite.callee.def_id().as_local() {
+                let callee_hir_id = self.tcx.hir().local_def_id_to_hir_id(callee_def_id);
+                // Avoid a cycle here by only using `instance_mir` only if we have
+                // a lower `HirId` than the callee. This ensures that the callee will
+                // not inline us. This trick only works without incremental compilation.
+                // So don't do it if that is enabled. Also avoid inlining into generators,
+                // since their `optimized_mir` is used for layout computation, which can
+                // create a cycle, even when no attempt is made to inline the function
+                // in the other direction.
+                if !self.tcx.dep_graph.is_fully_enabled()
+                    && self_hir_id < callee_hir_id
+                    && caller_body.generator_kind.is_none()
+                {
                     self.tcx.instance_mir(callsite.callee.def)
-                };
-
-                let callee_body: &Body<'tcx> = &*callee_body;
-
-                let callee_body = if self.consider_optimizing(callsite, callee_body) {
-                    self.tcx.subst_and_normalize_erasing_regions(
-                        &callsite.callee.substs,
-                        self.param_env,
-                        callee_body,
-                    )
                 } else {
                     continue;
-                };
+                }
+            } else {
+                // This cannot result in a cycle since the callee MIR is from another crate
+                // and is already optimized.
+                self.tcx.instance_mir(callsite.callee.def)
+            };
 
-                // Copy only unevaluated constants from the callee_body into the caller_body.
-                // Although we are only pushing `ConstKind::Unevaluated` consts to
-                // `required_consts`, here we may not only have `ConstKind::Unevaluated`
-                // because we are calling `subst_and_normalize_erasing_regions`.
-                caller_body.required_consts.extend(
-                    callee_body.required_consts.iter().copied().filter(|&constant| {
-                        matches!(constant.literal.val, ConstKind::Unevaluated(_, _, _))
-                    }),
-                );
+            let callee_body: &Body<'tcx> = &*callee_body;
 
-                let start = caller_body.basic_blocks().len();
-                debug!("attempting to inline callsite {:?} - body={:?}", callsite, callee_body);
-                if !self.inline_call(callsite, caller_body, callee_body) {
-                    debug!("attempting to inline callsite {:?} - failure", callsite);
-                    continue;
-                }
-                debug!("attempting to inline callsite {:?} - success", callsite);
-
-                // Add callsites from inlined function
-                for (bb, bb_data) in caller_body.basic_blocks().iter_enumerated().skip(start) {
-                    if let Some(new_callsite) =
-                        self.get_valid_function_call(bb, bb_data, caller_body)
-                    {
-                        // Don't inline the same function multiple times.
-                        if callsite.callee != new_callsite.callee {
-                            callsites.push_back(new_callsite);
-                        }
+            let callee_body = if self.consider_optimizing(callsite, callee_body) {
+                self.tcx.subst_and_normalize_erasing_regions(
+                    &callsite.callee.substs,
+                    self.param_env,
+                    callee_body,
+                )
+            } else {
+                continue;
+            };
+
+            // Copy only unevaluated constants from the callee_body into the caller_body.
+            // Although we are only pushing `ConstKind::Unevaluated` consts to
+            // `required_consts`, here we may not only have `ConstKind::Unevaluated`
+            // because we are calling `subst_and_normalize_erasing_regions`.
+            caller_body.required_consts.extend(callee_body.required_consts.iter().copied().filter(
+                |&constant| matches!(constant.literal.val, ConstKind::Unevaluated(_, _, _)),
+            ));
+
+            let start = caller_body.basic_blocks().len();
+            debug!("attempting to inline callsite {:?} - body={:?}", callsite, callee_body);
+            if !self.inline_call(callsite, caller_body, callee_body) {
+                debug!("attempting to inline callsite {:?} - failure", callsite);
+                continue;
+            }
+            debug!("attempting to inline callsite {:?} - success", callsite);
+
+            // Add callsites from inlined function
+            for (bb, bb_data) in caller_body.basic_blocks().iter_enumerated().skip(start) {
+                if let Some(new_callsite) = self.get_valid_function_call(bb, bb_data, caller_body) {
+                    // Don't inline the same function multiple times.
+                    if callsite.callee != new_callsite.callee {
+                        callsites.push_back(new_callsite);
                     }
                 }
-
-                local_change = true;
-                changed = true;
             }
 
-            if !local_change {
-                break;
-            }
+            changed = true;
         }
 
         // Simplify if we inlined anything.

compiler/rustc_target/src/spec/mipsel_unknown_none.rs

@@ -0,0 +1,42 @@
+//! Bare MIPS32r2, little endian, softfloat, O32 calling convention
+//!
+//! Can be used for MIPS M4K core (e.g. on PIC32MX devices)
+
+use crate::spec::abi::Abi;
+use crate::spec::{LinkerFlavor, LldFlavor, RelocModel};
+use crate::spec::{PanicStrategy, Target, TargetOptions};
+
+pub fn target() -> Target {
+    Target {
+        llvm_target: "mipsel-unknown-none".to_string(),
+        target_endian: "little".to_string(),
+        pointer_width: 32,
+        target_c_int_width: "32".to_string(),
+        data_layout: "e-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64".to_string(),
+        arch: "mips".to_string(),
+        target_os: "none".to_string(),
+        target_env: String::new(),
+        target_vendor: String::new(),
+        linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
+
+        options: TargetOptions {
+            cpu: "mips32r2".to_string(),
+            features: "+mips32r2,+soft-float,+noabicalls".to_string(),
+            max_atomic_width: Some(32),
+            executables: true,
+            linker: Some("rust-lld".to_owned()),
+            panic_strategy: PanicStrategy::Abort,
+            relocation_model: RelocModel::Static,
+            unsupported_abis: vec![
+                Abi::Stdcall,
+                Abi::Fastcall,
+                Abi::Vectorcall,
+                Abi::Thiscall,
+                Abi::Win64,
+                Abi::SysV64,
+            ],
+            emit_debug_gdb_scripts: false,
+            ..Default::default()
+        },
+    }
+}

compiler/rustc_target/src/spec/mod.rs

@@ -653,6 +653,7 @@ supported_targets! {
     ("powerpc64-wrs-vxworks", powerpc64_wrs_vxworks),
 
     ("mipsel-sony-psp", mipsel_sony_psp),
+    ("mipsel-unknown-none", mipsel_unknown_none),
     ("thumbv4t-none-eabi", thumbv4t_none_eabi),
 }
 

library/core/src/intrinsics.rs

@@ -764,7 +764,7 @@ extern "rust-intrinsic" {
     /// More specifically, this is the offset in bytes between successive
     /// items of the same type, including alignment padding.
     ///
-    /// The stabilized version of this intrinsic is [`size_of`].
+    /// The stabilized version of this intrinsic is [`crate::mem::size_of`].
     #[rustc_const_stable(feature = "const_size_of", since = "1.40.0")]
     pub fn size_of<T>() -> usize;
 

src/doc/rustc/src/platform-support.md

@@ -180,6 +180,7 @@ target | std | host | notes
 `i686-wrs-vxworks` | ? |  |
 `mips-unknown-linux-uclibc` | ✓ |  | MIPS Linux with uClibc
 `mipsel-unknown-linux-uclibc` | ✓ |  | MIPS (LE) Linux with uClibc
+`mipsel-unknown-none` | * |  | Bare MIPS (LE) softfloat
 `mipsel-sony-psp` | * |  | MIPS (LE) Sony PlayStation Portable (PSP)
 `mipsisa32r6-unknown-linux-gnu` | ? |  |
 `mipsisa32r6el-unknown-linux-gnu` | ? |  |