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allow setting jvm options from caller

This commit is contained in:
John Colvin 2023-03-05 13:03:32 +00:00
parent 08c07cda3a
commit 14145ad210
1 changed files with 10 additions and 8 deletions
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18
jni.d
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@ -135,7 +135,7 @@
Constructing Java objects works and it will pin it. Just remember Constructing Java objects works and it will pin it. Just remember
that `this` inside a method is still subject to escaping restrictions! that `this` inside a method is still subject to escaping restrictions!
+/ +/
module arsd.jni; module arsd.jni;
@ -1131,6 +1131,14 @@ struct ActivateJniEnv {
If `main` is in Java, this is not necessary and should not be If `main` is in Java, this is not necessary and should not be
used. used.
You can optionally pass a `JavaVMOption[]` to provide options
to the JVM when it starts, e.g.
`JavaVMOption("-Djava.compiler=NONE")` to disable JIT,
`JavaVMOption("-verbose:jni")` to print JNI-related messages,
` ``JavaVMOption(`-Djava.class.path=c:\Users\me\program\jni\`)``
to specify the path to user classes or
``JavaVMOption(`-Djava.library.path=c:\Users\me\program\jdk-13.0.1\lib\`);``
to set native library path
This function will try to load the jvm with dynamic runtime This function will try to load the jvm with dynamic runtime
linking. For this to succeed: linking. For this to succeed:
@ -1165,7 +1173,7 @@ struct ActivateJniEnv {
globally and it will use that jvm's environment and load classes and jars globally and it will use that jvm's environment and load classes and jars
through the java classpath. through the java classpath.
+/ +/
auto createJvm()() { auto createJvm()(JavaVMOption[] options = []) {
version(Windows) version(Windows)
import core.sys.windows.windows; import core.sys.windows.windows;
else else
@ -1195,12 +1203,6 @@ auto createJvm()() {
JNIEnv* env; JNIEnv* env;
JavaVMInitArgs vm_args; JavaVMInitArgs vm_args;
JavaVMOption[0] options;
//options[0].optionString = "-Djava.compiler=NONE"; /* disable JIT */
//options[1].optionString = "-verbose:jni"; /* print JNI-related messages */
//options[1].optionString = `-Djava.class.path=c:\Users\me\program\jni\`; /* user classes */
//options[2].optionString = `-Djava.library.path=c:\Users\me\program\jdk-13.0.1\lib\`; /* set native library path */
vm_args.version_ = JNI_VERSION_DESIRED; vm_args.version_ = JNI_VERSION_DESIRED;
vm_args.options = options.ptr; vm_args.options = options.ptr;