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package org.shedlang.compiler.backends.wasm;
import org.pcollections.PVector;
import org.shedlang.compiler.backends.Backend;
import org.shedlang.compiler.backends.PatioBackends;
import org.shedlang.compiler.backends.paths.PartialTargetPath;
import org.shedlang.compiler.backends.paths.TargetDir;
import org.shedlang.compiler.backends.targets.WasmTarget;
import org.shedlang.compiler.backends.wasm.structure.WasmBinaryFormat;
import org.shedlang.compiler.backends.wasm.structure.ast.instructions.WasmCall;
import org.shedlang.compiler.backends.wasm.structure.ast.instructions.WasmDrop;
import org.shedlang.compiler.backends.wasm.structure.ast.instructions.WasmExpression;
import org.shedlang.compiler.backends.wasm.structure.ast.modules.WasmFuncName;
import org.shedlang.compiler.backends.wasm.structure.ast.modules.WasmFunction;
import org.shedlang.compiler.backends.wasm.structure.ast.modules.WasmModule;
import org.shedlang.compiler.config.ProfileConfig;
import org.shedlang.compiler.config.ProjectConfig;
import org.shedlang.compiler.patio.PatioCompilationUnit;
import org.shedlang.compiler.runtime.ShedRuntime;
import org.shedlang.compiler.shid.ShidNamespace;
import org.shedlang.compiler.typechecker.TypeInfos;
import org.shedlang.compiler.types.NamespaceName;
import org.shedlang.compiler.util.P;
import org.shedlang.compiler.util.processes.ProcessError;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.ArrayList;
import java.util.List;
import static org.shedlang.compiler.util.processes.ProcessRunner.runInheritIo;
public class WasmBackend implements Backend {
public static final WasmBackend WASM32 = new WasmBackend(WasmTarget.WASM32);
public static final WasmBackend WASM64 = new WasmBackend(WasmTarget.WASM64);
public static final String EXECUTABLE_EXTENSION = ".wasm";
public static WasmBackend forTarget(WasmTarget target) {
return new WasmBackend(target);
}
private final WasmTarget target;
private WasmBackend(WasmTarget target) {
this.target = target;
}
@Override
public String targetName() {
return this.target.targetName();
}
@Override
public void compile(
ProjectConfig config,
ProfileConfig profileConfig,
List<ShidNamespace> namespaces,
TypeInfos typeInfos,
TargetDir targetDir
) throws IOException, InterruptedException {
PatioBackends.compile(
config,
profileConfig,
namespaces,
typeInfos,
new PatioToWasmBinary(targetDir, P.vector())
);
}
private class PatioToWasmBinary implements PatioBackends.PatioToTarget {
private final TargetDir targetDir;
private final PVector<Path> objectFilePaths;
public PatioToWasmBinary(TargetDir targetDir, PVector<Path> objectFilePaths) {
this.targetDir = targetDir;
this.objectFilePaths = objectFilePaths;
}
@Override
public PatioBackends.PatioToTarget namespace(
NamespaceName namespaceName,
PatioCompilationUnit patioCompilationUnit
) throws IOException {
var wasmModule = PatioToWasm.generateCompilationUnit(
patioCompilationUnit,
target
);
var objectPath = writeObjectFile(
wasmModule,
this.targetDir.namespace(namespaceName)
);
return new PatioToWasmBinary(
this.targetDir,
this.objectFilePaths.plus(objectPath)
);
}
@Override
public void bin(
String binName,
PatioCompilationUnit patioCompilationUnit,
String mainFunctionName,
ProfileConfig profileConfig
) throws IOException, InterruptedException {
var linkInputs = new ArrayList<>(objectFilePaths);
var mainModule = generateMain(patioCompilationUnit, mainFunctionName);
var mainObjectPath = writeObjectFile(mainModule, targetDir.bin(binName));
linkInputs.add(mainObjectPath);
var shedRuntime = ShedRuntime.runtime(
target.targetName(),
profileConfig.gc(),
targetDir
);
var outputBinPath = targetDir.topLevel(binName + EXECUTABLE_EXTENSION);
link(
linkInputs,
outputBinPath,
shedRuntime
);
validate(outputBinPath);
}
}
public void link(
List<Path> inputs,
Path outputPath,
ShedRuntime shedRuntime
) throws ProcessError, InterruptedException {
var ldArgs = new ArrayList<String>();
ldArgs.add("wasm-ld-23");
ldArgs.addAll(this.target.linkerFlags());
ldArgs.add("-o");
ldArgs.add(outputPath.toString());
for (var input : inputs) {
ldArgs.add(input.toString());
}
ldArgs.add(shedRuntime.dir().resolve("libpatio.a").toString());
ldArgs.add(shedRuntime.dir().resolve("libshed.a").toString());
ldArgs.add(shedRuntime.dir().resolve("libwalloc.a").toString());
runInheritIo(ldArgs);
}
private WasmModule generateMain(
PatioCompilationUnit patioCompilationUnit,
String mainFunctionName
) {
var wasmModule = PatioToWasm.generateCompilationUnit(
patioCompilationUnit,
this.target
);
wasmModule = generateNativeRuntime(wasmModule);
wasmModule = wasmModule.addFunction(new WasmFunction(
"_start",
List.of(),
List.of(),
List.of(),
new WasmExpression(List.of(
new WasmCall(new WasmFuncName(mainFunctionName)),
new WasmDrop()
))
));
return wasmModule;
}
/**
* Generates the parts of the runtime that are written in native WASM.
*/
public static WasmModule generateNativeRuntime(WasmModule wasmModule) {
return wasmModule;
}
private static Path writeObjectFile(
WasmModule module,
PartialTargetPath targetPath
) throws IOException {
var objectPath = targetPath.withExtension(".o");
Files.createDirectories(objectPath.getParent());
try (var outputStream = new FileOutputStream(objectPath.toFile())) {
WasmBinaryFormat.serializeModule(module, outputStream);
}
return objectPath;
}
private void validate(Path path) throws IOException, InterruptedException {
var command = P.vector("wasm-validate", "--enable-exceptions")
.plusAll(this.target.wabtFlags())
.plus(path.toString());
runInheritIo(command);
}
}
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