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package org.graalvm.wasm.utils;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.StandardOpenOption;
import java.util.function.Supplier;
import java.util.stream.Collectors;
public class WasmBinaryTools {
private static Supplier<String> asyncReadInputStream(InputStream is) {
class SupplierThread extends Thread implements Supplier<String> {
private String result = null;
@Override
public String get() {
try {
this.join();
} catch (InterruptedException e) {
throw new RuntimeException();
}
return result;
}
@Override
public void run() {
result = new BufferedReader(new InputStreamReader(is)).lines().collect(Collectors.joining(System.lineSeparator()));
}
}
final SupplierThread supplier = new SupplierThread();
supplier.start();
return supplier;
}
private static void runExternalToolAndVerify(String message, String[] commandLine) throws IOException, InterruptedException {
Runtime runtime = Runtime.getRuntime();
Process process = runtime.exec(commandLine);
Supplier<String> stdout = asyncReadInputStream(process.getInputStream());
Supplier<String> stderr = asyncReadInputStream(process.getErrorStream());
int exitCode = process.waitFor();
if (exitCode != 0) {
Assert.fail(Assert.format("%s ('%s', exit code %d)\nstderr:\n%s\nstdout:\n%s", message, String.join(" ", commandLine), exitCode, stderr.get(), stdout.get()));
}
}
private static byte[] wat2wasm(File input, File output) throws IOException, InterruptedException {
Assert.assertNotNull(
Assert.format("The %s property must be set in order to be able to compile .wat to .wasm", SystemProperties.WAT_TO_WASM_EXECUTABLE_PROPERTY_NAME),
SystemProperties.WAT_TO_WASM_EXECUTABLE);
// execute the wat2wasm tool and wait for it to finish execution
runExternalToolAndVerify(
"wat2wasm compilation failed",
new String[]{
SystemProperties.WAT_TO_WASM_EXECUTABLE,
input.getPath(),
// This option is needed so that wat2wasm agrees to generate
// invalid wasm files.
"-v",
"--no-check",
"-o",
output.getPath(),
});
// read the resulting binary, delete the temporary files and return
return Files.readAllBytes(output.toPath());
}
public static byte[] compileWat(File watFile) throws IOException, InterruptedException {
File wasmFile = File.createTempFile("wasm-bin-", ".wasm");
byte[] binary = wat2wasm(watFile, wasmFile);
wasmFile.deleteOnExit();
return binary;
}
public static byte[] compileWat(String name, String program) throws IOException, InterruptedException {
// create two temporary files for the text and the binary, write the given program to the
// first one
File watFile = File.createTempFile(name + "-wasm-text-", ".wat");
File wasmFile = File.createTempFile(name + "-wasm-bin-", ".wasm");
Files.write(watFile.toPath(), program.getBytes(StandardCharsets.UTF_8), StandardOpenOption.WRITE);
// read the resulting binary, delete the temporary files and return
byte[] binary = wat2wasm(watFile, wasmFile);
watFile.deleteOnExit();
wasmFile.deleteOnExit();
return binary;
}
}