C++ (Cpp) methodHandle::compressed_linenumber_table Examples

Example #1

File: jvmtiClassFileReconstituter.cpp Project: nikezheng/lookaside_java-1.8.0-openjdk

// Compute size of LineNumberTable
u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {
  // The line number table is compressed so we don't know how big it is until decompressed.
  // Decompression is really fast so we just do it twice.
  u2 num_entries = 0;
  CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
  while (stream.read_pair()) {
    num_entries++;
  }
  return num_entries;
}

Example #2

File: jvmtiClassFileReconstituter.cpp Project: nikezheng/lookaside_java-1.8.0-openjdk

// Write LineNumberTable attribute
// JVMSpec|   LineNumberTable_attribute {
// JVMSpec|     u2 attribute_name_index;
// JVMSpec|     u4 attribute_length;
// JVMSpec|     u2 line_number_table_length;
// JVMSpec|     {  u2 start_pc;
// JVMSpec|        u2 line_number;
// JVMSpec|     } line_number_table[line_number_table_length];
// JVMSpec|   }
void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,
                                                                    u2 num_entries) {

  write_attribute_name_index("LineNumberTable");
  write_u4(2 + num_entries * (2 + 2));
  write_u2(num_entries);

  CompressedLineNumberReadStream stream(method->compressed_linenumber_table());
  while (stream.read_pair()) {
    write_u2(stream.bci());
    write_u2(stream.line());
  }
}