8340398: [JVMCI] Unintuitive behavior of UseJVMCICompiler option

Backport-of: 4cd8c75a55163be33917b1fba9f360ea816f3aa9

Author: toddjonker

src/hotspot/share/jvmci/jvmci_globals.cpp

@@ -79,6 +79,15 @@ bool JVMCIGlobals::check_jvmci_flags_are_consistent() {
   CHECK_NOT_SET(JVMCIHostThreads, UseJVMCICompiler)
 
   if (UseJVMCICompiler) {
+    if (!FLAG_IS_DEFAULT(EnableJVMCI) && !EnableJVMCI) {
+      jio_fprintf(defaultStream::error_stream(),
+          "Improperly specified VM option UseJVMCICompiler: EnableJVMCI cannot be disabled\n");
+      return false;
+    }
+    FLAG_SET_DEFAULT(EnableJVMCI, true);
+  }
+
+  if (EnableJVMCI) {
     if (FLAG_IS_DEFAULT(UseJVMCINativeLibrary) && !UseJVMCINativeLibrary) {
       char path[JVM_MAXPATHLEN];
       if (os::dll_locate_lib(path, sizeof(path), Arguments::get_dll_dir(), JVMCI_SHARED_LIBRARY_NAME)) {
@@ -87,12 +96,9 @@ bool JVMCIGlobals::check_jvmci_flags_are_consistent() {
         FLAG_SET_DEFAULT(UseJVMCINativeLibrary, true);
       }
     }
-    if (!FLAG_IS_DEFAULT(EnableJVMCI) && !EnableJVMCI) {
-      jio_fprintf(defaultStream::error_stream(),
-          "Improperly specified VM option UseJVMCICompiler: EnableJVMCI cannot be disabled\n");
-      return false;
-    }
-    FLAG_SET_DEFAULT(EnableJVMCI, true);
+  }
+
+  if (UseJVMCICompiler) {
     if (BootstrapJVMCI && UseJVMCINativeLibrary) {
       jio_fprintf(defaultStream::error_stream(), "-XX:+BootstrapJVMCI is not compatible with -XX:+UseJVMCINativeLibrary\n");
       return false;

src/hotspot/share/jvmci/jvmci_globals.hpp

@@ -144,7 +144,7 @@ class fileStream;
   product(bool, UseJVMCINativeLibrary, false, EXPERIMENTAL,                 \
           "Execute JVMCI Java code from a shared library (\"libjvmci\") "   \
           "instead of loading it from class files and executing it "        \
-          "on the HotSpot heap. Defaults to true if EnableJVMCIProduct is " \
+          "on the HotSpot heap. Defaults to true if EnableJVMCI is "        \
           "true and a JVMCI native library is available.")                  \
                                                                             \
   product(double, JVMCINativeLibraryThreadFraction, 0.33, EXPERIMENTAL,     \

src/jdk.internal.vm.ci/share/classes/jdk/vm/ci/hotspot/HotSpotJVMCICompilerConfig.java

@@ -104,12 +104,15 @@ static JVMCICompilerFactory getCompilerFactory(HotSpotJVMCIRuntime runtime) {
                         }
                     }
                     if (factory == null) {
+                        String reason;
                         if (Services.IS_IN_NATIVE_IMAGE) {
-                            throw runtime.exitHotSpotWithMessage(1, "JVMCI compiler '%s' not found in JVMCI native library.%n" +
+                            reason = String.format("JVMCI compiler '%s' not found in JVMCI native library.%n" +
                                             "Use -XX:-UseJVMCINativeLibrary when specifying a JVMCI compiler available on a class path with %s.%n",
                                             compilerName, compPropertyName);
+                        } else {
+                            reason = String.format("JVMCI compiler '%s' specified by %s not found%n", compilerName, compPropertyName);
                         }
-                        throw runtime.exitHotSpotWithMessage(1, "JVMCI compiler '%s' specified by %s not found%n", compilerName, compPropertyName);
+                        factory = new DummyCompilerFactory(reason, runtime);
                     }
                 }
             } else {