/**
* look up this dynamic library for a symbol
*
* @param symbolName symbol name
* @return The <code>Address</code> of the symbol system handler (actually an address to an
* AixLinkage triplet). (-1: not found or couldn't be created)
*/
public Address getSymbol(String symbolName) {
// Convert file name from unicode to filesystem character set
// (assume file name is ascii, for now).
//
byte[] asciiName = VM_StringUtilities.stringToBytesNullTerminated(symbolName);
return VM_SysCall.sysCall.sysDlsym(libHandler, asciiName);
}
/**
* Load a dynamic library and maintain it in this object.
*
* @param libraryName library name
*/
private VM_DynamicLibrary(String libraryName) {
// Convert file name from unicode to filesystem character set.
// (Assume file name is ASCII, for now).
//
byte[] asciiName = VM_StringUtilities.stringToBytesNullTerminated(libraryName);
// make sure we have enough stack to load the library.
// This operation has been known to require more than 20K of stack.
VM_Thread myThread = VM_Scheduler.getCurrentThread();
Offset remaining = VM_Magic.getFramePointer().diff(myThread.stackLimit);
int stackNeededInBytes = VM_StackframeLayoutConstants.STACK_SIZE_DLOPEN - remaining.toInt();
if (stackNeededInBytes > 0) {
if (myThread.hasNativeStackFrame()) {
throw new java.lang.StackOverflowError("dlopen");
} else {
VM_Thread.resizeCurrentStack(myThread.getStackLength() + stackNeededInBytes, null);
}
}
libHandler = VM_SysCall.sysCall.sysDlopen(asciiName);
if (libHandler.isZero()) {
VM.sysWriteln("error loading library: " + libraryName);
throw new UnsatisfiedLinkError();
}
libName = libraryName;
try {
callOnLoad();
} catch (UnsatisfiedLinkError e) {
unload();
throw e;
}
if (VM.verboseJNI) {
VM.sysWriteln("[Loaded native library: " + libName + "]");
}
}