[DDC,bazel] Allow no digest when not in worker mode

Change-Id: Id4d2b385bc00e7dc4e20aefea9ba38e4839bbaca
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/114065
Reviewed-by: David Morgan <davidmorgan@google.com>
Reviewed-by: Johnni Winther <johnniwinther@google.com>
Commit-Queue: Jens Johansen <jensj@google.com>

pkg/dev_compiler/lib/src/compiler/shared_command.dart

@@ -393,6 +393,7 @@ Future<CompilerResult> compile(ParsedArguments args,
   if (args.isKernel) {
     return kernel_compiler.compile(args.rest,
         compilerState: previousResult?.kernelState,
+        isWorker: args.isWorker,
         useIncrementalCompiler: args.useIncrementalCompiler,
         inputDigests: inputDigests);
   } else {

pkg/dev_compiler/lib/src/kernel/command.dart

@@ -36,11 +36,13 @@ const _binaryName = 'dartdevc -k';
 /// Returns `true` if the program compiled without any fatal errors.
 Future<CompilerResult> compile(List<String> args,
     {fe.InitializedCompilerState compilerState,
+    bool isWorker = false,
     bool useIncrementalCompiler = false,
     Map<Uri, List<int>> inputDigests}) async {
   try {
     return await _compile(args,
         compilerState: compilerState,
+        isWorker: isWorker,
         useIncrementalCompiler: useIncrementalCompiler,
         inputDigests: inputDigests);
   } catch (error, stackTrace) {
@@ -69,6 +71,7 @@ String _usageMessage(ArgParser ddcArgParser) =>
 
 Future<CompilerResult> _compile(List<String> args,
     {fe.InitializedCompilerState compilerState,
+    bool isWorker = false,
     bool useIncrementalCompiler = false,
     Map<Uri, List<int>> inputDigests}) async {
   // TODO(jmesserly): refactor options to share code with dartdevc CLI.
@@ -255,6 +258,20 @@ Future<CompilerResult> _compile(List<String> args,
         experiments: experiments,
         environmentDefines: declaredVariables);
   } else {
+    // If digests weren't given and if not in worker mode, create fake data and
+    // ensure we don't have a previous state (as that wouldn't be safe with
+    // fake input digests).
+    if (!isWorker && (inputDigests == null || inputDigests.isEmpty)) {
+      oldCompilerState = null;
+      inputDigests ??= {};
+      if (!compileSdk) {
+        inputDigests[sourcePathToUri(sdkSummaryPath)] = const [0];
+      }
+      for (Uri uri in summaryModules.keys) {
+        inputDigests[uri] = const [0];
+      }
+    }
+
     doneInputSummaries = List<Component>(summaryModules.length);
     compilerState = await fe.initializeIncrementalCompiler(
         oldCompilerState,

utils/bazel/kernel_worker.dart

@@ -244,13 +244,29 @@ Future<ComputeKernelResult> computeKernel(List<String> args,
   fe.InitializedCompilerState state;
   bool usingIncrementalCompiler = false;
   bool recordUsedInputs = parsedArgs["used-inputs"] != null;
-  if (parsedArgs['use-incremental-compiler'] && isWorker) {
+  if (parsedArgs['use-incremental-compiler']) {
     usingIncrementalCompiler = true;
 
     /// Build a map of uris to digests.
     final inputDigests = <Uri, List<int>>{};
-    for (var input in inputs) {
-      inputDigests[_toUri(input.path)] = input.digest;
+    if (inputs != null) {
+      for (var input in inputs) {
+        inputDigests[_toUri(input.path)] = input.digest;
+      }
+    }
+
+    // If digests weren't given and if not in worker mode, create fake data and
+    // ensure we don't have a previous state (as that wouldn't be safe with
+    // fake input digests).
+    if (!isWorker && inputDigests.isEmpty) {
+      previousState = null;
+      inputDigests[_toUri(parsedArgs['dart-sdk-summary'])] = const [0];
+      for (Uri uri in summaryInputs) {
+        inputDigests[uri] = const [0];
+      }
+      for (Uri uri in linkedInputs) {
+        inputDigests[uri] = const [0];
+      }
     }
 
     // TODO(sigmund): add support for experiments with the incremental compiler.