(> a49b2e8)move DecisionId into coverageinfo/mcdc.rs

Author: zhuyunxing

compiler/rustc_middle/src/mir/coverage.rs

@@ -50,16 +50,6 @@ rustc_index::newtype_index! {
     #[debug_format = "ExpressionId({})"]
     pub struct ExpressionId {}
 }
-
-rustc_index::newtype_index! {
-    /// ID of a mcdc decision. Used to identify decision in a function.
-    #[derive(HashStable)]
-    #[encodable]
-    #[orderable]
-    #[debug_format = "DecisionId({})"]
-    pub struct DecisionId {}
-}
-
 rustc_index::newtype_index! {
     /// ID of a mcdc condition. Used by llvm to check mcdc coverage.
     ///

compiler/rustc_mir_build/src/build/coverageinfo/mcdc.rs

@@ -5,7 +5,7 @@ use std::rc::Rc;
 use rustc_data_structures::fx::FxIndexMap;
 use rustc_middle::bug;
 use rustc_middle::mir::coverage::{
-    BlockMarkerId, ConditionId, ConditionInfo, DecisionId, MCDCBranchSpan, MCDCDecisionSpan,
+    BlockMarkerId, ConditionId, ConditionInfo, MCDCBranchSpan, MCDCDecisionSpan,
 };
 use rustc_middle::mir::BasicBlock;
 use rustc_middle::thir::{ExprKind, LogicalOp};
@@ -24,6 +24,9 @@ const MAX_CONDITIONS_IN_DECISION: usize = 6;
 /// consuming excessive memory.
 const MAX_DECISION_DEPTH: u16 = 0x3FFF;
 
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
+struct DecisionId(usize);
+
 #[derive(Debug)]
 struct BooleanDecisionCtx {
     id: DecisionId,
@@ -253,7 +256,7 @@ impl MCDCTargetInfo {
 struct DecisionIdGen(usize);
 impl DecisionIdGen {
     fn next_decision_id(&mut self) -> DecisionId {
-        let id = DecisionId::from_usize(self.0);
+        let id = DecisionId(self.0);
         self.0 += 1;
         id
     }