8294368: Java incremental builds broken on Windows after JDK-8293116

Reviewed-by: erikj, djelinski, jlahoda

make/common/JavaCompilation.gmk

@@ -403,6 +403,7 @@ define SetupJavaCompilationBody
     $1_COMPILE_TARGET := $$($1_BIN)$$($1_MODULE_SUBDIR)/_the.$1_batch
     $1_FILELIST := $$($1_BIN)$$($1_MODULE_SUBDIR)/_the.$1_batch.filelist
     $1_MODFILELIST := $$($1_BIN)$$($1_MODULE_SUBDIR)/_the.$1_batch.modfiles
+    $1_MODFILELIST_FIXED := $$($1_MODFILELIST).fixed
 
     $1_API_TARGET := $$($1_BIN)$$($1_MODULE_SUBDIR)/_the.$1_pubapi
     $1_API_INTERNAL := $$($1_BIN)$$($1_MODULE_SUBDIR)/_the.$1_internalapi
@@ -469,15 +470,21 @@ define SetupJavaCompilationBody
 		$$(eval $1_MODFILES := $$?)
 		$$(eval $$(call ListPathsSafely, $1_MODFILES, $$($1_MODFILELIST)))
 
+    # Convert the paths in the MODFILELIST file to Windows-style paths
+    # on Windows. This is needed because javac operates on Windows-style paths
+    # when running on Windows. On other platforms this just copies the MODFILELIST file.
+    $$($1_MODFILELIST_FIXED): $$($1_MODFILELIST)
+		$$(call FixPathFile, $$($1_MODFILELIST), $$($1_MODFILELIST_FIXED))
+
     # Do the actual compilation
     $$($1_COMPILE_TARGET): $$($1_SRCS) $$($1_FILELIST) $$($1_DEPENDS) \
         $$($1_VARDEPS_FILE) $$($1_EXTRA_DEPS) $$($1_JAVAC_SERVER_CONFIG) \
-        $$($1_MODFILELIST)
+        $$($1_MODFILELIST_FIXED)
 		$$(call MakeDir, $$(@D))
 		$$(call ExecuteWithLog, $$($1_BIN)$$($1_MODULE_SUBDIR)/_the.$$($1_SAFE_NAME)_batch, \
 		    $$($1_JAVAC_CMD) $$($1_FLAGS) \
 		        $$($1_API_DIGEST_FLAGS) \
-		        -XDmodifiedInputs=$$($1_MODFILELIST) \
+		        -XDmodifiedInputs=$$($1_MODFILELIST_FIXED) \
 		        -d $$($1_BIN) $$($1_HEADERS_ARG) @$$($1_FILELIST)) && \
 		$(TOUCH) $$@
 

make/common/MakeBase.gmk

@@ -442,12 +442,23 @@ endif
 # list.
 # This is normally not needed since we use the FIXPATH prefix for command lines,
 # but might be needed in certain circumstances.
+#
+# FixPathFile is the file version of FixPath. It instead takes a file with paths in $1
+# and outputs the 'fixed' paths into the file in $2. If the file in $2 already exists
+# it is overwritten.
+# On non-Windows platforms this instead does a copy, so that $2 can still be used
+# as a depenendency of a make rule, instead of having to conditionally depend on
+# $1 instead, based on the target platform.
 ifeq ($(call isTargetOs, windows), true)
   FixPath = \
     $(strip $(subst \,\\, $(shell $(FIXPATH_BASE) print $(patsubst $(FIXPATH), , $1))))
+  FixPathFile = \
+    $(shell $(FIXPATH_BASE) convert $1 $2)
 else
   FixPath = \
       $1
+  FixPathFile = \
+      $(shell $(CP) $1 $2)
 endif
 
 ################################################################################

make/jdk/src/classes/build/tools/depend/Depend.java

@@ -154,7 +154,9 @@ public void init(JavacTask jt, String... args) {
             if (internalAPIPath == null) {
                 throw new IllegalStateException("Expected internalAPIPath to be set using -XDinternalAPIPath=<internal-API-path>");
             }
-            Set<String> modified = new HashSet<>(Files.readAllLines(Paths.get(modifiedInputs)));
+            Set<Path> modified = Files.readAllLines(Paths.get(modifiedInputs)).stream()
+                                                                              .map(Paths::get)
+                                                                              .collect(Collectors.toSet());
             Path internalAPIDigestFile = Paths.get(internalAPIPath);
             JavaCompiler compiler = JavaCompiler.instance(context);
             Class<?> initialFileParserIntf = Class.forName("com.sun.tools.javac.main.JavaCompiler$InitialFileParserIntf");
@@ -255,7 +257,7 @@ public ClassLoader getClassLoader(JavaFileManager.Location location) {
     }
 
     private com.sun.tools.javac.util.List<JCCompilationUnit> doFilteredParse(
-            JavaCompiler compiler, Iterable<JavaFileObject> fileObjects, Set<String> modified,
+            JavaCompiler compiler, Iterable<JavaFileObject> fileObjects, Set<Path> modified,
             Path internalAPIDigestFile, AtomicBoolean noApiChange,
             boolean debug) {
         Map<String, String> internalAPI = new LinkedHashMap<>();
@@ -272,10 +274,11 @@ private com.sun.tools.javac.util.List<JCCompilationUnit> doFilteredParse(
         }
         Map<JavaFileObject, JCCompilationUnit> files2CUT = new IdentityHashMap<>();
         boolean fullRecompile = modified.stream()
+                                        .map(Path::toString)
                                         .anyMatch(f -> !StringUtils.toLowerCase(f).endsWith(".java"));
         ListBuffer<JCCompilationUnit> result = new ListBuffer<>();
         for (JavaFileObject jfo : fileObjects) {
-            if (modified.contains(jfo.getName())) {
+            if (modified.contains(Path.of(jfo.getName()))) {
                 JCCompilationUnit parsed = compiler.parse(jfo);
                 files2CUT.put(jfo, parsed);
                 String currentSignature = treeDigest(parsed);
@@ -289,7 +292,7 @@ private com.sun.tools.javac.util.List<JCCompilationUnit> doFilteredParse(
 
         if (fullRecompile) {
             for (JavaFileObject jfo : fileObjects) {
-                if (!modified.contains(jfo.getName())) {
+                if (!modified.contains(Path.of(jfo.getName()))) {
                     JCCompilationUnit parsed = files2CUT.get(jfo);
                     if (parsed == null) {
                         parsed = compiler.parse(jfo);
@@ -320,6 +323,7 @@ private com.sun.tools.javac.util.List<JCCompilationUnit> doFilteredParse(
                          .findAny()
                          .orElseGet(() -> "unknown");
             String nonJavaModifiedFiles = modified.stream()
+                                                  .map(Path::toString)
                                                   .filter(f -> !StringUtils.toLowerCase(f)
                                                                            .endsWith(".java"))
                                                   .collect(Collectors.joining(", "));
@@ -879,13 +883,13 @@ public Void visitModifiers(ModifiersTree node, Void p) {
     private class FilteredInitialFileParser implements InvocationHandler {
 
         private final JavaCompiler compiler;
-        private final Set<String> modified;
+        private final Set<Path> modified;
         private final Path internalAPIDigestFile;
         private final AtomicBoolean noApiChange;
         private final boolean debug;
 
         public FilteredInitialFileParser(JavaCompiler compiler,
-                                         Set<String> modified,
+                                         Set<Path> modified,
                                          Path internalAPIDigestFile,
                                          AtomicBoolean noApiChange,
                                          boolean debug) {

make/scripts/fixpath.sh

@@ -352,6 +352,21 @@ function convert_path() {
   fi
 }
 
+# Treat $1 as name of a file containing paths. Convert those paths to Windows style,
+# and output them to the file specified by $2.
+# If the output file already exists, it is overwritten.
+function convert_file() {
+  infile="$1"
+  outfile="$2"
+  if [[ -e $outfile ]] ; then
+    rm $outfile
+  fi
+  while read line; do
+    convert_path "$line"
+    echo "$result" >> $outfile
+  done < $infile
+}
+
 # Treat $1 as name of a file containing paths. Convert those paths to Windows style,
 # in a new temporary file, and return a string "@<temp file>" pointing to that
 # new file.
@@ -498,6 +513,8 @@ if [[ "$ACTION" == "import" ]] ; then
 elif [[ "$ACTION" == "print" ]] ; then
   print_command_line "$@"
   echo "$result"
+elif [[ "$ACTION" == "convert" ]] ; then
+  convert_file "$@"
 elif [[ "$ACTION" == "exec" ]] ; then
   exec_command_line "$@"
   # Propagate exit code