/**
* Dynamically look up a native variable by name.
*
* <p>Look up the symbol in the default list of loaded libraries.
*
* @param varName
* @param size the size of the variable in bytes
* @return a Pointer that can be used to get/set the variable
* @throws RuntimeException if there is no function by that name.
*/
public VarPointer getGlobalVariableAddress(String varName, int size) {
Address result = getSymbolAddress(varName);
if (DEBUG) {
VM.print("Var Lookup for ");
VM.print(varName);
VM.print(", size: ");
VM.print(size);
VM.print(" returned ");
VM.printAddress(result);
VM.println();
}
if (result.isZero()) {
if (varName.charAt(0) != '_') {
return getGlobalVariableAddress("_" + varName, size);
}
throw new RuntimeException(
"Can't find native symbol " + varName + ". OS Error: " + errorStr());
}
return new VarPointer(varName, result, size);
}
/**
* Dynamically look up a native function address by name. Look up the symbol in the specified
* library
*
* @param funcName
* @return address of the function
* @throws RuntimeException if there is no function by that name.
*/
private Address getFunction0(String funcName) {
Address result = getSymbolAddress(funcName);
if (DEBUG) {
VM.print("Function Lookup for ");
VM.print(funcName);
VM.print(" = ");
VM.printAddress(result);
VM.println();
}
if (result.isZero()) {
if (Platform.getPlatform().isWindows()) {
if (funcName.charAt(funcName.length() - 1) != 'A') {
return getFunction0(funcName + 'A');
}
} else if (funcName.charAt(0) != '_') {
return getFunction0("_" + funcName);
}
throw new RuntimeException(
"Can't find native symbol " + funcName + ". OS Error: " + errorStr());
}
return result;
}