Rollup merge of rust-lang#66515 - Centril:cheaper-inline-asm, r=oli-obk

Reduce size of `hir::Expr` by boxing more of `hir::InlineAsm`

r? @oli-obk

Author: Centril

src/librustc/hir/intravisit.rs

@@ -1086,10 +1086,9 @@ pub fn walk_expr<'v, V: Visitor<'v>>(visitor: &mut V, expression: &'v Expr) {
         ExprKind::Ret(ref optional_expression) => {
             walk_list!(visitor, visit_expr, optional_expression);
         }
-        ExprKind::InlineAsm(_, ref outputs, ref inputs) => {
-            for expr in outputs.iter().chain(inputs.iter()) {
-                visitor.visit_expr(expr)
-            }
+        ExprKind::InlineAsm(ref asm) => {
+            walk_list!(visitor, visit_expr, &asm.outputs_exprs);
+            walk_list!(visitor, visit_expr, &asm.inputs_exprs);
         }
         ExprKind::Yield(ref subexpression, _) => {
             visitor.visit_expr(subexpression);

src/librustc/hir/lowering/expr.rs

@@ -966,7 +966,7 @@ impl LoweringContext<'_> {
     }
 
     fn lower_expr_asm(&mut self, asm: &InlineAsm) -> hir::ExprKind {
-        let hir_asm = hir::InlineAsm {
+        let inner = hir::InlineAsmInner {
             inputs: asm.inputs.iter().map(|&(ref c, _)| c.clone()).collect(),
             outputs: asm.outputs
                 .iter()
@@ -984,18 +984,18 @@ impl LoweringContext<'_> {
             alignstack: asm.alignstack,
             dialect: asm.dialect,
         };
-
-        let outputs = asm.outputs
-            .iter()
-            .map(|out| self.lower_expr(&out.expr))
-            .collect();
-
-        let inputs = asm.inputs
-            .iter()
-            .map(|&(_, ref input)| self.lower_expr(input))
-            .collect();
-
-        hir::ExprKind::InlineAsm(P(hir_asm), outputs, inputs)
+        let hir_asm = hir::InlineAsm {
+            inner,
+            inputs_exprs: asm.inputs
+                .iter()
+                .map(|&(_, ref input)| self.lower_expr(input))
+                .collect(),
+            outputs_exprs: asm.outputs
+                .iter()
+                .map(|out| self.lower_expr(&out.expr))
+                .collect(),
+        };
+        hir::ExprKind::InlineAsm(P(hir_asm))
     }
 
     fn lower_field(&mut self, f: &Field) -> hir::Field {

src/librustc/hir/mod.rs

@@ -1457,7 +1457,7 @@ pub struct Expr {
 
 // `Expr` is used a lot. Make sure it doesn't unintentionally get bigger.
 #[cfg(target_arch = "x86_64")]
-static_assert_size!(Expr, 72);
+static_assert_size!(Expr, 64);
 
 impl Expr {
     pub fn precedence(&self) -> ExprPrecedence {
@@ -1656,7 +1656,7 @@ pub enum ExprKind {
     Ret(Option<P<Expr>>),
 
     /// Inline assembly (from `asm!`), with its outputs and inputs.
-    InlineAsm(P<InlineAsm>, HirVec<Expr>, HirVec<Expr>),
+    InlineAsm(P<InlineAsm>),
 
     /// A struct or struct-like variant literal expression.
     ///
@@ -2063,7 +2063,7 @@ pub struct InlineAsmOutput {
 // NOTE(eddyb) This is used within MIR as well, so unlike the rest of the HIR,
 // it needs to be `Clone` and use plain `Vec<T>` instead of `HirVec<T>`.
 #[derive(Clone, RustcEncodable, RustcDecodable, Debug, HashStable)]
-pub struct InlineAsm {
+pub struct InlineAsmInner {
     pub asm: Symbol,
     pub asm_str_style: StrStyle,
     pub outputs: Vec<InlineAsmOutput>,
@@ -2074,6 +2074,13 @@ pub struct InlineAsm {
     pub dialect: AsmDialect,
 }
 
+#[derive(RustcEncodable, RustcDecodable, Debug, HashStable)]
+pub struct InlineAsm {
+    pub inner: InlineAsmInner,
+    pub outputs_exprs: HirVec<Expr>,
+    pub inputs_exprs: HirVec<Expr>,
+}
+
 /// Represents a parameter in a function header.
 #[derive(RustcEncodable, RustcDecodable, Debug, HashStable)]
 pub struct Param {

src/librustc/hir/print.rs

@@ -1365,14 +1365,15 @@ impl<'a> State<'a> {
                     self.print_expr_maybe_paren(&expr, parser::PREC_JUMP);
                 }
             }
-            hir::ExprKind::InlineAsm(ref a, ref outputs, ref inputs) => {
+            hir::ExprKind::InlineAsm(ref a) => {
+                let i = &a.inner;
                 self.s.word("asm!");
                 self.popen();
-                self.print_string(&a.asm.as_str(), a.asm_str_style);
+                self.print_string(&i.asm.as_str(), i.asm_str_style);
                 self.word_space(":");
 
                 let mut out_idx = 0;
-                self.commasep(Inconsistent, &a.outputs, |s, out| {
+                self.commasep(Inconsistent, &i.outputs, |s, out| {
                     let constraint = out.constraint.as_str();
                     let mut ch = constraint.chars();
                     match ch.next() {
@@ -1383,36 +1384,36 @@ impl<'a> State<'a> {
                         _ => s.print_string(&constraint, ast::StrStyle::Cooked),
                     }
                     s.popen();
-                    s.print_expr(&outputs[out_idx]);
+                    s.print_expr(&a.outputs_exprs[out_idx]);
                     s.pclose();
                     out_idx += 1;
                 });
                 self.s.space();
                 self.word_space(":");
 
                 let mut in_idx = 0;
-                self.commasep(Inconsistent, &a.inputs, |s, co| {
+                self.commasep(Inconsistent, &i.inputs, |s, co| {
                     s.print_string(&co.as_str(), ast::StrStyle::Cooked);
                     s.popen();
-                    s.print_expr(&inputs[in_idx]);
+                    s.print_expr(&a.inputs_exprs[in_idx]);
                     s.pclose();
                     in_idx += 1;
                 });
                 self.s.space();
                 self.word_space(":");
 
-                self.commasep(Inconsistent, &a.clobbers, |s, co| {
+                self.commasep(Inconsistent, &i.clobbers, |s, co| {
                     s.print_string(&co.as_str(), ast::StrStyle::Cooked);
                 });
 
                 let mut options = vec![];
-                if a.volatile {
+                if i.volatile {
                     options.push("volatile");
                 }
-                if a.alignstack {
+                if i.alignstack {
                     options.push("alignstack");
                 }
-                if a.dialect == ast::AsmDialect::Intel {
+                if i.dialect == ast::AsmDialect::Intel {
                     options.push("intel");
                 }
 

src/librustc/middle/expr_use_visitor.rs

@@ -283,15 +283,15 @@ impl<'a, 'tcx> ExprUseVisitor<'a, 'tcx> {
                 self.borrow_expr(&base, bk);
             }
 
-            hir::ExprKind::InlineAsm(ref ia, ref outputs, ref inputs) => {
-                for (o, output) in ia.outputs.iter().zip(outputs) {
+            hir::ExprKind::InlineAsm(ref ia) => {
+                for (o, output) in ia.inner.outputs.iter().zip(&ia.outputs_exprs) {
                     if o.is_indirect {
                         self.consume_expr(output);
                     } else {
                         self.mutate_expr(output);
                     }
                 }
-                self.consume_exprs(inputs);
+                self.consume_exprs(&ia.inputs_exprs);
             }
 
             hir::ExprKind::Continue(..) |

src/librustc/mir/mod.rs

@@ -6,7 +6,7 @@
 
 use crate::hir::def::{CtorKind, Namespace};
 use crate::hir::def_id::DefId;
-use crate::hir::{self, InlineAsm as HirInlineAsm};
+use crate::hir;
 use crate::mir::interpret::{PanicInfo, Scalar};
 use crate::mir::visit::MirVisitable;
 use crate::ty::adjustment::PointerCast;
@@ -1638,7 +1638,7 @@ pub enum FakeReadCause {
 
 #[derive(Clone, Debug, RustcEncodable, RustcDecodable, HashStable, TypeFoldable)]
 pub struct InlineAsm<'tcx> {
-    pub asm: HirInlineAsm,
+    pub asm: hir::InlineAsmInner,
     pub outputs: Box<[Place<'tcx>]>,
     pub inputs: Box<[(Span, Operand<'tcx>)]>,
 }

src/librustc/ty/structural_impls.rs

@@ -301,7 +301,7 @@ CloneTypeFoldableAndLiftImpls! {
     ::syntax_pos::symbol::Symbol,
     crate::hir::def::Res,
     crate::hir::def_id::DefId,
-    crate::hir::InlineAsm,
+    crate::hir::InlineAsmInner,
     crate::hir::MatchSource,
     crate::hir::Mutability,
     crate::hir::Unsafety,

src/librustc_codegen_llvm/asm.rs

@@ -17,7 +17,7 @@ use libc::{c_uint, c_char};
 impl AsmBuilderMethods<'tcx> for Builder<'a, 'll, 'tcx> {
     fn codegen_inline_asm(
         &mut self,
-        ia: &hir::InlineAsm,
+        ia: &hir::InlineAsmInner,
         outputs: Vec<PlaceRef<'tcx, &'ll Value>>,
         mut inputs: Vec<&'ll Value>,
         span: Span,

src/librustc_codegen_ssa/traits/asm.rs

@@ -1,13 +1,13 @@
 use super::BackendTypes;
 use crate::mir::place::PlaceRef;
-use rustc::hir::{GlobalAsm, InlineAsm};
+use rustc::hir::{GlobalAsm, InlineAsmInner};
 use syntax_pos::Span;
 
 pub trait AsmBuilderMethods<'tcx>: BackendTypes {
     /// Take an inline assembly expression and splat it out via LLVM
     fn codegen_inline_asm(
         &mut self,
-        ia: &InlineAsm,
+        ia: &InlineAsmInner,
         outputs: Vec<PlaceRef<'tcx, Self::Value>>,
         inputs: Vec<Self::Value>,
         span: Span,

src/librustc_mir/hair/cx/expr.rs

@@ -533,11 +533,11 @@ fn make_mirror_unadjusted<'a, 'tcx>(
             convert_path_expr(cx, expr, res)
         }
 
-        hir::ExprKind::InlineAsm(ref asm, ref outputs, ref inputs) => {
+        hir::ExprKind::InlineAsm(ref asm) => {
             ExprKind::InlineAsm {
-                asm,
-                outputs: outputs.to_ref(),
-                inputs: inputs.to_ref(),
+                asm: &asm.inner,
+                outputs: asm.outputs_exprs.to_ref(),
+                inputs: asm.inputs_exprs.to_ref(),
             }
         }
 

src/librustc_mir/hair/mod.rs

@@ -93,6 +93,10 @@ pub enum StmtKind<'tcx> {
     },
 }
 
+// `Expr` is used a lot. Make sure it doesn't unintentionally get bigger.
+#[cfg(target_arch = "x86_64")]
+rustc_data_structures::static_assert_size!(Expr<'_>, 168);
+
 /// The Hair trait implementor lowers their expressions (`&'tcx H::Expr`)
 /// into instances of this `Expr` enum. This lowering can be done
 /// basically as lazily or as eagerly as desired: every recursive
@@ -264,7 +268,7 @@ pub enum ExprKind<'tcx> {
         user_ty: Option<Canonical<'tcx, UserType<'tcx>>>,
     },
     InlineAsm {
-        asm: &'tcx hir::InlineAsm,
+        asm: &'tcx hir::InlineAsmInner,
         outputs: Vec<ExprRef<'tcx>>,
         inputs: Vec<ExprRef<'tcx>>
     },

src/librustc_passes/liveness.rs

@@ -1184,17 +1184,21 @@ impl<'a, 'tcx> Liveness<'a, 'tcx> {
                 self.propagate_through_expr(&e, succ)
             }
 
-            hir::ExprKind::InlineAsm(ref ia, ref outputs, ref inputs) => {
+            hir::ExprKind::InlineAsm(ref asm) => {
+                let ia = &asm.inner;
+                let outputs = &asm.outputs_exprs;
+                let inputs = &asm.inputs_exprs;
                 let succ = ia.outputs.iter().zip(outputs).rev().fold(succ, |succ, (o, output)| {
-                // see comment on places
-                // in propagate_through_place_components()
-                if o.is_indirect {
-                    self.propagate_through_expr(output, succ)
-                } else {
-                    let acc = if o.is_rw { ACC_WRITE|ACC_READ } else { ACC_WRITE };
-                    let succ = self.write_place(output, succ, acc);
-                    self.propagate_through_place_components(output, succ)
-                }});
+                    // see comment on places
+                    // in propagate_through_place_components()
+                    if o.is_indirect {
+                        self.propagate_through_expr(output, succ)
+                    } else {
+                        let acc = if o.is_rw { ACC_WRITE|ACC_READ } else { ACC_WRITE };
+                        let succ = self.write_place(output, succ, acc);
+                        self.propagate_through_place_components(output, succ)
+                    }
+                });
 
                 // Inputs are executed first. Propagate last because of rev order
                 self.propagate_through_exprs(inputs, succ)
@@ -1395,13 +1399,13 @@ fn check_expr<'tcx>(this: &mut Liveness<'_, 'tcx>, expr: &'tcx Expr) {
             }
         }
 
-        hir::ExprKind::InlineAsm(ref ia, ref outputs, ref inputs) => {
-            for input in inputs {
+        hir::ExprKind::InlineAsm(ref asm) => {
+            for input in &asm.inputs_exprs {
                 this.visit_expr(input);
             }
 
             // Output operands must be places
-            for (o, output) in ia.outputs.iter().zip(outputs) {
+            for (o, output) in asm.inner.outputs.iter().zip(&asm.outputs_exprs) {
                 if !o.is_indirect {
                     this.check_place(output);
                 }

src/librustc_typeck/check/expr.rs

@@ -244,8 +244,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             ExprKind::Path(ref qpath) => {
                 self.check_expr_path(qpath, expr)
             }
-            ExprKind::InlineAsm(_, ref outputs, ref inputs) => {
-                for expr in outputs.iter().chain(inputs.iter()) {
+            ExprKind::InlineAsm(ref asm) => {
+                for expr in asm.outputs_exprs.iter().chain(asm.inputs_exprs.iter()) {
                     self.check_expr(expr);
                 }
                 tcx.mk_unit()