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package org.reasm.batch;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.ServiceLoader;
import org.reasm.*;
import org.reasm.messages.InternalAssemblerErrorMessage;
import org.reasm.source.SourceFile;
/**
* The main class of the batch assembler.
*
* @author Francis Gagné
*/
public class Assembler {
// TODO
// - Read all the Configuration data from a file, not from command-line arguments
// - Command-line arguments may influence the assembler's behavior (e.g. emit a listing or not)
/**
* The entry point of the batch assembler.
*
* @param args
* the command-line arguments
*/
public static void main(String[] args) {
if (args.length < 2) {
System.out.println("Usage: java -jar reasm-batch.jar <file> <initialArchitecture>");
System.exit(1);
} else {
try {
// Initialize the environment.
final ArrayList<Architecture> architectures = new ArrayList<>();
final ServiceLoader<ArchitectureProvider> loader = ServiceLoader.load(ArchitectureProvider.class);
for (ArchitectureProvider architectureProvider : loader) {
for (Architecture architecture : architectureProvider) {
architectures.add(architecture);
}
}
final Environment environment = Environment.DEFAULT.addArchitectures(architectures);
// Set the initial architecture.
final Architecture initialArchitecture = environment.findArchitectureByName(args[1]);
if (initialArchitecture == null) {
System.err.println("Architecture \"" + args[1] + "\" was not found");
return;
}
// Create the main source file.
final Path path = Paths.get(args[0]);
final SourceFile mainSourceFile = new SourceFile(new String(Files.readAllBytes(path), "UTF-8"), path.getFileName()
.toString());
// Create a configuration.
final FileFetcher fileFetcher = new LocalFileFetcher(args[0]);
final Configuration configuration = new Configuration(environment, mainSourceFile, initialArchitecture)
.setFileFetcher(fileFetcher);
// Assemble the source based on this configuration.
final Assembly assembly = new Assembly(configuration);
// Assemble the file.
while (performPass(assembly)) {
}
if (assembly.getGravity() != MessageGravity.NONE) {
displayMessages(assembly);
} else {
System.out.println("No assembly messages.");
}
if (assembly.getGravity().compareTo(MessageGravity.ERROR) >= 0) {
System.exit(1);
}
outputFile(assembly, "a.out");
} catch (FileNotFoundException e) {
System.err.println(args[0] + ": " + e.toString());
System.exit(1);
} catch (UnsupportedEncodingException e) {
System.err.println("The UTF-8 encoding is not supported by this Java runtime.");
System.exit(1);
} catch (IOException e) {
System.err.println(args[0] + ": " + e.toString());
System.exit(1);
}
}
}
/**
* Displays the messages that occurred in the assembly.
*
* @param assembly
* the assembly
*/
private static void displayMessages(Assembly assembly) {
for (AssemblyMessage message : assembly.getMessages()) {
final AssemblyStep step = message.getStep();
if (step == null) {
System.out.printf("(no location): %s: %s%n", getGravityName(message.getGravity()), message.getText());
} else {
AssemblyStepLocation location = step.getLocation();
System.out.printf("%s: %s: %s%n> %s%n", location.getFullPath(), getGravityName(message.getGravity()),
message.getText(), location.getSourceLocation().getTextReader().readToString());
}
if (message instanceof InternalAssemblerErrorMessage) {
((InternalAssemblerErrorMessage) message).getThrowable().printStackTrace();
}
}
}
/**
* Gets the description of a message gravity level.
*
* @param gravity
* the message gravity level
* @return the description
*/
private static String getGravityName(MessageGravity gravity) {
switch (gravity) {
case NONE:
return "Message";
case INFORMATION:
return "Information";
case WARNING:
return "Warning";
case ERROR:
return "Error";
case FATAL_ERROR:
return "Fatal error";
default:
return "Unknown";
}
}
/**
* Outputs the assembly to a file.
*
* @param assembly
* the assembly
* @param fileName
* the name of the output file
* @throws IOException
* an I/O exception occurred while working with the output file
* @throws FileNotFoundException
* the output file could not be created or opened for writing
*/
private static void outputFile(Assembly assembly, String fileName) throws IOException {
try (FileOutputStream out = new FileOutputStream(fileName)) {
assembly.writeAssembledDataTo(out);
}
}
/**
* Performs a pass in the specified assembly.
*
* @param assembly
* the assembly in which to perform a pass
* @return <code>true</code> if there are more passes to perform, or <code>false</code> if the assembly is complete.
*/
private static boolean performPass(Assembly assembly) {
System.out.printf("Pass %d%n", assembly.getCurrentPass());
AssemblyCompletionStatus status;
while ((status = assembly.step()) == AssemblyCompletionStatus.PENDING) {
}
return status == AssemblyCompletionStatus.STARTED_NEW_PASS;
}
}
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