Generate field-inject dispatch code

buildSrc/src/main/kotlin/instrument-glue.gradle.kts

@@ -10,6 +10,7 @@ sourceSets {
   create("glue") {
     output.dir(generatedGlueResources)
     output.dir(generatedGlueJava)
+    java.include("**/glue/*")
   }
   main {
     resources.srcDir(generatedGlueResources)

field-inject/build.gradle.kts

@@ -1,7 +1,29 @@
 plugins {
   id("java-common")
+  id("instrument-glue")
 }
 
 dependencies {
+
+  testImplementation(sourceSets["glue"].output)
+  testImplementation(project(":utils"))
+  testImplementation(libs.asm.commons)
+  testImplementation(libs.asm.util)
+
   jmh("com.blogspot.mydailyjava:weak-lock-free:0.18")
 }
+
+// include GlobalObjectStore in glue generation, so we can repackage it for injection
+sourceSets["glue"].java {
+  srcDir("src/main/java")
+  include("**/GlobalObjectStore.java")
+}
+
+// field-inject generates dispatch + access glue for injection into the bootstrap classpath
+extra["glue"] = listOf("ObjectStoreGlue")
+
+tasks.jar {
+  // ObjectStoreGlue only contains large string constants that get inlined into FieldInjector
+  // - the inlining means we can safely drop ObjectStoreGlue from the final jar to save space
+  excludes.add("datadog/instrument/glue/ObjectStoreGlue.class")
+}