fix: add import references when needed

.changes/bbe2e7de-79d3-4aea-97d1-d5c244ede433.json

@@ -0,0 +1,5 @@
+{
+  "id": "bbe2e7de-79d3-4aea-97d1-d5c244ede433",
+  "type": "bugfix",
+  "description": "Adds import to the symbols references when needed. This issue surfaced when building the protocol tests with the latest Smithy release"
+}

codegen/smithy-kotlin-codegen/src/main/kotlin/software/amazon/smithy/kotlin/codegen/core/KotlinSymbolProvider.kt

@@ -252,7 +252,7 @@ class KotlinSymbolProvider(private val model: Model, private val settings: Kotli
             }
 
             targetShape.isDocumentShape -> getDefaultValueForDocument(node)
-            targetShape.isTimestampShape -> getDefaultValueForTimestamp(node.asNumberNode().get())
+            targetShape.isTimestampShape -> getDefaultValueForTimestamp(this, node.asNumberNode().get())
 
             node.isNumberNode -> getDefaultValueForNumber(targetShape.type, node.toString())
             node.isArrayNode -> "listOf()"
@@ -264,17 +264,14 @@ class KotlinSymbolProvider(private val model: Model, private val settings: Kotli
         defaultValue(defaultValue)
     }
 
-    private fun getDefaultValueForTimestamp(node: NumberNode): String {
-        val instant = RuntimeTypes.Core.Instant
-
+    private fun getDefaultValueForTimestamp(builder: Symbol.Builder, node: NumberNode): String {
+        builder.addReferences(RuntimeTypes.Core.Instant)
         return if (node.isFloatingPointNumber) {
-            val fromEpochMilliseconds = RuntimeTypes.Core.fromEpochMilliseconds
-
             val value = node.value as Double
             val ms = round(value * 1e3).toLong()
-            "$fromEpochMilliseconds.invoke($instant, $ms)"
+            "Instant.fromEpochMilliseconds($ms)"
         } else {
-            "$instant.fromEpochSeconds(${node.value}, 0)"
+            "Instant.fromEpochSeconds(${node.value}, 0)"
         }
     }
 

codegen/smithy-kotlin-codegen/src/main/kotlin/software/amazon/smithy/kotlin/codegen/rendering/ShapeValueGenerator.kt

@@ -6,6 +6,7 @@ package software.amazon.smithy.kotlin.codegen.rendering
 
 import software.amazon.smithy.codegen.core.CodegenException
 import software.amazon.smithy.codegen.core.SymbolProvider
+import software.amazon.smithy.codegen.core.SymbolReference
 import software.amazon.smithy.kotlin.codegen.core.*
 import software.amazon.smithy.kotlin.codegen.model.SymbolProperty
 import software.amazon.smithy.kotlin.codegen.model.hasTrait
@@ -90,9 +91,9 @@ class ShapeValueGenerator(
     private fun mapDeclaration(writer: KotlinWriter, shape: MapShape, block: () -> Unit) {
         writer.pushState()
         writer.trimTrailingSpaces(false)
-
-        val collectionGeneratorFunction = symbolProvider.toSymbol(shape).expectProperty(SymbolProperty.IMMUTABLE_COLLECTION_FUNCTION)
-
+        val mapSymbol = symbolProvider.toSymbol(shape)
+        writer.addImportReferences(mapSymbol, SymbolReference.ContextOption.USE)
+        val collectionGeneratorFunction = mapSymbol.expectProperty(SymbolProperty.IMMUTABLE_COLLECTION_FUNCTION)
         writer.writeInline("$collectionGeneratorFunction(")
             .ensureNewline()
             .indent()
@@ -109,11 +110,8 @@ class ShapeValueGenerator(
         writer.trimTrailingSpaces(false)
 
         val collectionSymbol = symbolProvider.toSymbol(shape)
+        writer.addImportReferences(collectionSymbol, SymbolReference.ContextOption.USE)
         val generatorFn = collectionSymbol.expectProperty(SymbolProperty.IMMUTABLE_COLLECTION_FUNCTION)
-
-        collectionSymbol.references.forEach {
-            writer.addImport(it.symbol)
-        }
         writer.writeInline("$generatorFn(")
             .ensureNewline()
             .indent()

codegen/smithy-kotlin-codegen/src/main/kotlin/software/amazon/smithy/kotlin/codegen/rendering/serde/SerializeStructGenerator.kt

@@ -5,6 +5,7 @@
 package software.amazon.smithy.kotlin.codegen.rendering.serde
 
 import software.amazon.smithy.codegen.core.CodegenException
+import software.amazon.smithy.codegen.core.SymbolReference
 import software.amazon.smithy.kotlin.codegen.DefaultValueSerializationMode
 import software.amazon.smithy.kotlin.codegen.core.*
 import software.amazon.smithy.kotlin.codegen.model.*
@@ -595,6 +596,7 @@ open class SerializeStructGenerator(
         val postfix = if (memberShape.hasTrait<IdempotencyTokenTrait>()) idempotencyTokenPostfix(memberShape) else ""
         val memberSymbol = ctx.symbolProvider.toSymbol(memberShape)
         val memberName = ctx.symbolProvider.toMemberName(memberShape)
+        writer.addImportReferences(memberSymbol, SymbolReference.ContextOption.USE)
         if (memberSymbol.isNullable) {
             val identifier = valueToSerializeName("it")
             val fn = serializerFn.format(memberShape, identifier)

codegen/smithy-kotlin-codegen/src/test/kotlin/software/amazon/smithy/kotlin/codegen/core/SymbolProviderTest.kt

@@ -186,8 +186,8 @@ class SymbolProviderTest {
         "boolean,true,true",
         "bigInteger,5,5",
         "bigDecimal,9.0123456789,9.0123456789",
-        "timestamp,1684869901,'aws.smithy.kotlin.runtime.time.Instant.fromEpochSeconds(1684869901, 0)'",
-        "timestamp,1.5,'aws.smithy.kotlin.runtime.time.fromEpochMilliseconds.invoke(aws.smithy.kotlin.runtime.time.Instant, 1500)'",
+        "timestamp,1684869901,'Instant.fromEpochSeconds(1684869901, 0)'",
+        "timestamp,1.5,'Instant.fromEpochMilliseconds(1500)'",
     )
     fun `can default simple types`(typeName: String, modeledDefault: String, expectedDefault: String) {
         val model = """