FIR: support suspend functions #KT-24084 Fixed

compiler/fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt

@@ -548,6 +548,7 @@ class RawFirBuilder(val session: FirSession) {
                 function.hasModifier(KtTokens.INLINE_KEYWORD),
                 function.hasModifier(KtTokens.TAILREC_KEYWORD),
                 function.hasModifier(KtTokens.EXTERNAL_KEYWORD),
+                function.hasModifier(KtTokens.SUSPEND_KEYWORD),
                 function.receiverTypeReference.convertSafe(),
                 if (function.hasBlockBody()) {
                     typeReference.toFirOrUnitType()

compiler/fir/psi2fir/testData/rawBuilder/declarations/simpleFun.kt

@@ -1 +1,3 @@
 fun foo() {}
+
+suspend fun bar() {}

compiler/fir/psi2fir/testData/rawBuilder/declarations/simpleFun.txt

@@ -1,3 +1,5 @@
 FILE: simpleFun.kt
     public? final? function foo(): kotlin.Unit {
     }
+    public? final? suspend function bar(): kotlin.Unit {
+    }

compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt

@@ -170,6 +170,9 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
             if (memberDeclaration.isExternal) {
                 print("external ")
             }
+            if (memberDeclaration.isSuspend) {
+                print("suspend ")
+            }
         } else if (memberDeclaration is FirProperty) {
             if (memberDeclaration.isConst) {
                 print("const ")

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirDeclarationStatus.kt

@@ -44,6 +44,8 @@ interface FirDeclarationStatus : FirElement {
 
     val isData: Boolean
 
+    val isSuspend: Boolean
+
     override val psi: PsiElement?
         get() = null
 

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirNamedFunction.kt

@@ -21,6 +21,8 @@ interface FirNamedFunction : @VisitedSupertype FirFunction, FirCallableMember {
 
     val isExternal: Boolean get() = status.isExternal
 
+    val isSuspend: Boolean get() = status.isSuspend
+
     override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R =
         visitor.visitNamedFunction(this, data)
 

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirDeclarationStatusImpl.kt

@@ -106,6 +106,12 @@ open class FirDeclarationStatusImpl(
             this[DATA] = value
         }
 
+    override var isSuspend: Boolean
+        get() = this[SUSPEND]
+        set(value) {
+            this[SUSPEND] = value
+        }
+
     private enum class Modifier(val mask: Int) {
         EXPECT(0x1),
         ACTUAL(0x2),
@@ -119,7 +125,8 @@ open class FirDeclarationStatusImpl(
         LATEINIT(0x200),
         INNER(0x400),
         COMPANION(0x800),
-        DATA(0x1000)
+        DATA(0x1000),
+        SUSPEND(0x2000)
     }
 
     fun resolved(visibility: Visibility, modality: Modality): FirDeclarationStatus {

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirMemberFunctionImpl.kt

@@ -32,6 +32,7 @@ class FirMemberFunctionImpl(
     isInline: Boolean,
     isTailRec: Boolean,
     isExternal: Boolean,
+    isSuspend: Boolean,
     receiverType: FirType?,
     returnType: FirType,
     override val body: FirBody?
@@ -45,6 +46,7 @@ class FirMemberFunctionImpl(
         status.isInline = isInline
         status.isTailRec = isTailRec
         status.isExternal = isExternal
+        status.isSuspend = isSuspend
     }
 
     override val valueParameters = mutableListOf<FirValueParameter>()