scftorture: Count single_rpc offline failures in statistics outputgrafted

scf_torture_stats_print() aggregates each invoker thread's counters
into a local scf_statistics structure before printing, but the
n_single_rpc_ofl field is missing from the aggregation loop.  As a
result, the "single_rpc_ofl" value printed in the statistics line is
always zero, even when smp_call_function_single() invocations for the
RPC test have failed due to offline CPUs and been counted by the
invoker threads.

Add the missing accumulation so that the printed value reflects the
actual counts.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

1 files changed, 313 insertions, 0 deletions

diff --git a/rust/syn/classify.rs b/rust/syn/classify.rs
new file mode 100644
index 000000000..92a975bfe
--- /dev/null
+++ b/rust/syn/classify.rs
@@ -0,0 +1,313 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+#[cfg(feature = "full")]
+use crate::expr::Expr;
+#[cfg(any(feature = "printing", feature = "full"))]
+use crate::generics::TypeParamBound;
+#[cfg(any(feature = "printing", feature = "full"))]
+use crate::path::{Path, PathArguments};
+#[cfg(any(feature = "printing", feature = "full"))]
+use crate::punctuated::Punctuated;
+#[cfg(any(feature = "printing", feature = "full"))]
+use crate::ty::{ReturnType, Type};
+#[cfg(feature = "full")]
+use proc_macro2::{Delimiter, TokenStream, TokenTree};
+#[cfg(any(feature = "printing", feature = "full"))]
+use std::ops::ControlFlow;
+
+#[cfg(feature = "full")]
+pub(crate) fn requires_semi_to_be_stmt(expr: &Expr) -> bool {
+    match expr {
+        Expr::Macro(expr) => !expr.mac.delimiter.is_brace(),
+        _ => requires_comma_to_be_match_arm(expr),
+    }
+}
+
+#[cfg(feature = "full")]
+pub(crate) fn requires_comma_to_be_match_arm(expr: &Expr) -> bool {
+    match expr {
+        Expr::If(_)
+        | Expr::Match(_)
+        | Expr::Block(_) | Expr::Unsafe(_) // both under ExprKind::Block in rustc
+        | Expr::While(_)
+        | Expr::Loop(_)
+        | Expr::ForLoop(_)
+        | Expr::TryBlock(_)
+        | Expr::Const(_) => false,
+
+        Expr::Array(_)
+        | Expr::Assign(_)
+        | Expr::Async(_)
+        | Expr::Await(_)
+        | Expr::Binary(_)
+        | Expr::Break(_)
+        | Expr::Call(_)
+        | Expr::Cast(_)
+        | Expr::Closure(_)
+        | Expr::Continue(_)
+        | Expr::Field(_)
+        | Expr::Group(_)
+        | Expr::Index(_)
+        | Expr::Infer(_)
+        | Expr::Let(_)
+        | Expr::Lit(_)
+        | Expr::Macro(_)
+        | Expr::MethodCall(_)
+        | Expr::Paren(_)
+        | Expr::Path(_)
+        | Expr::Range(_)
+        | Expr::RawAddr(_)
+        | Expr::Reference(_)
+        | Expr::Repeat(_)
+        | Expr::Return(_)
+        | Expr::Struct(_)
+        | Expr::Try(_)
+        | Expr::Tuple(_)
+        | Expr::Unary(_)
+        | Expr::Yield(_)
+        | Expr::Verbatim(_) => true,
+    }
+}
+
+#[cfg(feature = "printing")]
+pub(crate) fn trailing_unparameterized_path(mut ty: &Type) -> bool {
+    loop {
+        match ty {
+            Type::BareFn(t) => match &t.output {
+                ReturnType::Default => return false,
+                ReturnType::Type(_, ret) => ty = ret,
+            },
+            Type::ImplTrait(t) => match last_type_in_bounds(&t.bounds) {
+                ControlFlow::Break(trailing_path) => return trailing_path,
+                ControlFlow::Continue(t) => ty = t,
+            },
+            Type::Path(t) => match last_type_in_path(&t.path) {
+                ControlFlow::Break(trailing_path) => return trailing_path,
+                ControlFlow::Continue(t) => ty = t,
+            },
+            Type::Ptr(t) => ty = &t.elem,
+            Type::Reference(t) => ty = &t.elem,
+            Type::TraitObject(t) => match last_type_in_bounds(&t.bounds) {
+                ControlFlow::Break(trailing_path) => return trailing_path,
+                ControlFlow::Continue(t) => ty = t,
+            },
+
+            Type::Array(_)
+            | Type::Group(_)
+            | Type::Infer(_)
+            | Type::Macro(_)
+            | Type::Never(_)
+            | Type::Paren(_)
+            | Type::Slice(_)
+            | Type::Tuple(_)
+            | Type::Verbatim(_) => return false,
+        }
+    }
+
+    fn last_type_in_path(path: &Path) -> ControlFlow<bool, &Type> {
+        match &path.segments.last().unwrap().arguments {
+            PathArguments::None => ControlFlow::Break(true),
+            PathArguments::AngleBracketed(_) => ControlFlow::Break(false),
+            PathArguments::Parenthesized(arg) => match &arg.output {
+                ReturnType::Default => ControlFlow::Break(false),
+                ReturnType::Type(_, ret) => ControlFlow::Continue(ret),
+            },
+        }
+    }
+
+    fn last_type_in_bounds(
+        bounds: &Punctuated<TypeParamBound, Token![+]>,
+    ) -> ControlFlow<bool, &Type> {
+        match bounds.last().unwrap() {
+            TypeParamBound::Trait(t) => last_type_in_path(&t.path),
+            TypeParamBound::Lifetime(_)
+            | TypeParamBound::PreciseCapture(_)
+            | TypeParamBound::Verbatim(_) => ControlFlow::Break(false),
+        }
+    }
+}
+
+/// Whether the expression's first token is the label of a loop/block.
+#[cfg(all(feature = "printing", feature = "full"))]
+pub(crate) fn expr_leading_label(mut expr: &Expr) -> bool {
+    loop {
+        match expr {
+            Expr::Block(e) => return e.label.is_some(),
+            Expr::ForLoop(e) => return e.label.is_some(),
+            Expr::Loop(e) => return e.label.is_some(),
+            Expr::While(e) => return e.label.is_some(),
+
+            Expr::Assign(e) => expr = &e.left,
+            Expr::Await(e) => expr = &e.base,
+            Expr::Binary(e) => expr = &e.left,
+            Expr::Call(e) => expr = &e.func,
+            Expr::Cast(e) => expr = &e.expr,
+            Expr::Field(e) => expr = &e.base,
+            Expr::Index(e) => expr = &e.expr,
+            Expr::MethodCall(e) => expr = &e.receiver,
+            Expr::Range(e) => match &e.start {
+                Some(start) => expr = start,
+                None => return false,
+            },
+            Expr::Try(e) => expr = &e.expr,
+
+            Expr::Array(_)
+            | Expr::Async(_)
+            | Expr::Break(_)
+            | Expr::Closure(_)
+            | Expr::Const(_)
+            | Expr::Continue(_)
+            | Expr::Group(_)
+            | Expr::If(_)
+            | Expr::Infer(_)
+            | Expr::Let(_)
+            | Expr::Lit(_)
+            | Expr::Macro(_)
+            | Expr::Match(_)
+            | Expr::Paren(_)
+            | Expr::Path(_)
+            | Expr::RawAddr(_)
+            | Expr::Reference(_)
+            | Expr::Repeat(_)
+            | Expr::Return(_)
+            | Expr::Struct(_)
+            | Expr::TryBlock(_)
+            | Expr::Tuple(_)
+            | Expr::Unary(_)
+            | Expr::Unsafe(_)
+            | Expr::Verbatim(_)
+            | Expr::Yield(_) => return false,
+        }
+    }
+}
+
+/// Whether the expression's last token is `}`.
+#[cfg(feature = "full")]
+pub(crate) fn expr_trailing_brace(mut expr: &Expr) -> bool {
+    loop {
+        match expr {
+            Expr::Async(_)
+            | Expr::Block(_)
+            | Expr::Const(_)
+            | Expr::ForLoop(_)
+            | Expr::If(_)
+            | Expr::Loop(_)
+            | Expr::Match(_)
+            | Expr::Struct(_)
+            | Expr::TryBlock(_)
+            | Expr::Unsafe(_)
+            | Expr::While(_) => return true,
+
+            Expr::Assign(e) => expr = &e.right,
+            Expr::Binary(e) => expr = &e.right,
+            Expr::Break(e) => match &e.expr {
+                Some(e) => expr = e,
+                None => return false,
+            },
+            Expr::Cast(e) => return type_trailing_brace(&e.ty),
+            Expr::Closure(e) => expr = &e.body,
+            Expr::Let(e) => expr = &e.expr,
+            Expr::Macro(e) => return e.mac.delimiter.is_brace(),
+            Expr::Range(e) => match &e.end {
+                Some(end) => expr = end,
+                None => return false,
+            },
+            Expr::RawAddr(e) => expr = &e.expr,
+            Expr::Reference(e) => expr = &e.expr,
+            Expr::Return(e) => match &e.expr {
+                Some(e) => expr = e,
+                None => return false,
+            },
+            Expr::Unary(e) => expr = &e.expr,
+            Expr::Verbatim(e) => return tokens_trailing_brace(e),
+            Expr::Yield(e) => match &e.expr {
+                Some(e) => expr = e,
+                None => return false,
+            },
+
+            Expr::Array(_)
+            | Expr::Await(_)
+            | Expr::Call(_)
+            | Expr::Continue(_)
+            | Expr::Field(_)
+            | Expr::Group(_)
+            | Expr::Index(_)
+            | Expr::Infer(_)
+            | Expr::Lit(_)
+            | Expr::MethodCall(_)
+            | Expr::Paren(_)
+            | Expr::Path(_)
+            | Expr::Repeat(_)
+            | Expr::Try(_)
+            | Expr::Tuple(_) => return false,
+        }
+    }
+
+    fn type_trailing_brace(mut ty: &Type) -> bool {
+        loop {
+            match ty {
+                Type::BareFn(t) => match &t.output {
+                    ReturnType::Default => return false,
+                    ReturnType::Type(_, ret) => ty = ret,
+                },
+                Type::ImplTrait(t) => match last_type_in_bounds(&t.bounds) {
+                    ControlFlow::Break(trailing_brace) => return trailing_brace,
+                    ControlFlow::Continue(t) => ty = t,
+                },
+                Type::Macro(t) => return t.mac.delimiter.is_brace(),
+                Type::Path(t) => match last_type_in_path(&t.path) {
+                    Some(t) => ty = t,
+                    None => return false,
+                },
+                Type::Ptr(t) => ty = &t.elem,
+                Type::Reference(t) => ty = &t.elem,
+                Type::TraitObject(t) => match last_type_in_bounds(&t.bounds) {
+                    ControlFlow::Break(trailing_brace) => return trailing_brace,
+                    ControlFlow::Continue(t) => ty = t,
+                },
+                Type::Verbatim(t) => return tokens_trailing_brace(t),
+
+                Type::Array(_)
+                | Type::Group(_)
+                | Type::Infer(_)
+                | Type::Never(_)
+                | Type::Paren(_)
+                | Type::Slice(_)
+                | Type::Tuple(_) => return false,
+            }
+        }
+    }
+
+    fn last_type_in_path(path: &Path) -> Option<&Type> {
+        match &path.segments.last().unwrap().arguments {
+            PathArguments::None | PathArguments::AngleBracketed(_) => None,
+            PathArguments::Parenthesized(arg) => match &arg.output {
+                ReturnType::Default => None,
+                ReturnType::Type(_, ret) => Some(ret),
+            },
+        }
+    }
+
+    fn last_type_in_bounds(
+        bounds: &Punctuated<TypeParamBound, Token![+]>,
+    ) -> ControlFlow<bool, &Type> {
+        match bounds.last().unwrap() {
+            TypeParamBound::Trait(t) => match last_type_in_path(&t.path) {
+                Some(t) => ControlFlow::Continue(t),
+                None => ControlFlow::Break(false),
+            },
+            TypeParamBound::Lifetime(_) | TypeParamBound::PreciseCapture(_) => {
+                ControlFlow::Break(false)
+            }
+            TypeParamBound::Verbatim(t) => ControlFlow::Break(tokens_trailing_brace(t)),
+        }
+    }
+
+    fn tokens_trailing_brace(tokens: &TokenStream) -> bool {
+        if let Some(TokenTree::Group(last)) = tokens.clone().into_iter().last() {
+            last.delimiter() == Delimiter::Brace
+        } else {
+            false
+        }
+    }
+}