Hello,
I was not able to compile a Java file generated by protoc 2.10 from a
rather big .proto file.
It seems I have hit the upper limit for a Java string literal
(65535???).
I slightly modified src/google/protobuf/compiler/java/java_file.cc so
that static initialization is performed from
an array of literal strings in the case CEscape(file_data).size() >
65535.
Is this a real problem, or am I missing something ?
Here is the patch:
diff -r -u protobuf-2.1.0/src/google/protobuf/compiler/java/
java_file.cc protobuf-2.1.0.new/src/google/protobuf/compiler/java/
java_file.cc
--- protobuf-2.1.0/src/google/protobuf/compiler/java/java_file.cc
2009-05-13 16:36:30.000000000 -0400
+++ protobuf-2.1.0.new/src/google/protobuf/compiler/java/java_file.cc
2009-07-22 10:37:28.000000000 -0400
@@ -207,6 +207,9 @@
// This makes huge bytecode files and can easily hit the compiler's
internal
// code size limits (error "code to large"). String literals are
apparently
// embedded raw, which is what we want.
+ // In the case the FileDescriptorProto is too big for fitting into
a string
+ // literal, first creating ain array of string literals, then
concatenating
+ // them into the final FileDescriptorProto string.
FileDescriptorProto file_proto;
file_->CopyTo(&file_proto);
string file_data;
@@ -218,22 +221,51 @@
" return descriptor;\n"
"}\n"
"private static com.google.protobuf.Descriptors.FileDescriptor\n"
- " descriptor;\n"
- "static {\n"
- " java.lang.String descriptorData =\n");
- printer->Indent();
- printer->Indent();
+ " descriptor;\n");
- // Only write 40 bytes per line.
static const int kBytesPerLine = 40;
- for (int i = 0; i < file_data.size(); i += kBytesPerLine) {
- if (i > 0) printer->Print(" +\n");
- printer->Print("\"$data$\"",
- "data", CEscape(file_data.substr(i, kBytesPerLine)));
- }
- printer->Print(";\n");
- printer->Outdent();
+ // Limit for a Java literal string is 65535
+ bool stringTooLong = (CEscape(file_data).size() > 65535);
+
+ if (stringTooLong) {
+ printer->Print("static {\n"
+ " java.lang.String descriptorDataArray[] = {\n");
+ printer->Indent();
+ printer->Indent();
+
+ // Only write 40 bytes per line.
+ for (int i = 0; i < file_data.size(); i += kBytesPerLine) {
+ if (i > 0) printer->Print(",\n");
+ printer->Print("\"$data$\"",
+ "data", CEscape(file_data.substr(i, kBytesPerLine)));
+ }
+ printer->Outdent();
+ printer->Print("\n"
+ "};\n\n");
+ printer->Print("java.lang.String descriptorData = \"\";\n");
+ printer->Print("for (String data : descriptorDataArray) {\n");
+ printer->Indent();
+ printer->Print("descriptorData += data;\n");
+ printer->Outdent();
+ printer->Print("}\n\n");
+ } else {
+ printer->Print("static {\n"
+ " java.lang.String descriptorData =\n");
+ printer->Indent();
+ printer->Indent();
+
+ // Only write 40 bytes per line.
+ static const int kBytesPerLine = 40;
+ for (int i = 0; i < file_data.size(); i += kBytesPerLine) {
+ if (i > 0) printer->Print(" +\n");
+ printer->Print("\"$data$\"",
+ "data", CEscape(file_data.substr(i, kBytesPerLine)));
+ }
+ printer->Print(";\n");
+
+ printer->Outdent();
+ }
//
-----------------------------------------------------------------
// Create the InternalDescriptorAssigner.
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