Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1998, 2012, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "compiler/compilerOracle.hpp"

 #include "memory/allocation.inline.hpp"

 #include "memory/oopFactory.hpp"

 #include "memory/resourceArea.hpp"

 #include "oops/klass.hpp"

 #include "oops/method.hpp"

 #include "oops/oop.inline.hpp"

 #include "oops/symbol.hpp"

 #include "runtime/handles.inline.hpp"

 #include "runtime/jniHandles.hpp"

 class MethodMatcher : public CHeapObj<mtCompiler> {

  public:

   enum Mode {

     Exact,

     Prefix = 1,

     Suffix = 2,

     Substring = Prefix | Suffix,

     Any,

     Unknown = -1

   };

  protected:

   Symbol*        _class_name;

   Symbol*        _method_name;

   Symbol*        _signature;

   Mode           _class_mode;

   Mode           _method_mode;

   MethodMatcher* _next;

   static bool match(Symbol* candidate, Symbol* match, Mode match_mode);

   Symbol* class_name() const { return _class_name; }

   Symbol* method_name() const { return _method_name; }

   Symbol* signature() const { return _signature; }

  public:

   MethodMatcher(Symbol* class_name, Mode class_mode,

                 Symbol* method_name, Mode method_mode,

                 Symbol* signature, MethodMatcher* next);

   MethodMatcher(Symbol* class_name, Symbol* method_name, MethodMatcher* next);

   // utility method

   MethodMatcher* find(methodHandle method) {

     Symbol* class_name  = Klass::cast(method->method_holder())->name();

     Symbol* method_name = method->name();

     for (MethodMatcher* current = this; current != NULL; current = current->_next) {

       if (match(class_name, current->class_name(), current->_class_mode) &&

           match(method_name, current->method_name(), current->_method_mode) &&

           (current->signature() == NULL || current->signature() == method->signature())) {

         return current;

       }

     }

     return NULL;

   }

   bool match(methodHandle method) {

     return find(method) != NULL;

   }

   MethodMatcher* next() const { return _next; }

   static void print_symbol(Symbol* h, Mode mode) {

     ResourceMark rm;

     if (mode == Suffix || mode == Substring || mode == Any) {

       tty->print("*");

     }

     if (mode != Any) {

       h->print_symbol_on(tty);

     }

     if (mode == Prefix || mode == Substring) {

       tty->print("*");

     }

   }

   void print_base() {

     print_symbol(class_name(), _class_mode);

     tty->print(".");

     print_symbol(method_name(), _method_mode);

     if (signature() != NULL) {

       tty->print(" ");

       signature()->print_symbol_on(tty);

     }

   }

   virtual void print() {

     print_base();

     tty->cr();

   }

 };

 MethodMatcher::MethodMatcher(Symbol* class_name, Symbol* method_name, MethodMatcher* next) {

   _class_name  = class_name;

   _method_name = method_name;

   _next        = next;

   _class_mode  = MethodMatcher::Exact;

   _method_mode = MethodMatcher::Exact;

   _signature   = NULL;

 }

 MethodMatcher::MethodMatcher(Symbol* class_name, Mode class_mode,

                              Symbol* method_name, Mode method_mode,

                              Symbol* signature, MethodMatcher* next):

     _class_mode(class_mode)

   , _method_mode(method_mode)

   , _next(next)

   , _class_name(class_name)

   , _method_name(method_name)

   , _signature(signature) {

 }

 bool MethodMatcher::match(Symbol* candidate, Symbol* match, Mode match_mode) {

   if (match_mode == Any) {

     return true;

   }

   if (match_mode == Exact) {

     return candidate == match;

   }

   ResourceMark rm;

   const char * candidate_string = candidate->as_C_string();

   const char * match_string = match->as_C_string();

   switch (match_mode) {

   case Prefix:

     return strstr(candidate_string, match_string) == candidate_string;

   case Suffix: {

     size_t clen = strlen(candidate_string);

     size_t mlen = strlen(match_string);

     return clen >= mlen && strcmp(candidate_string + clen - mlen, match_string) == 0;

   }

   case Substring:

     return strstr(candidate_string, match_string) != NULL;

   default:

     return false;

   }

 }

 class MethodOptionMatcher: public MethodMatcher {

   const char * option;

  public:

   MethodOptionMatcher(Symbol* class_name, Mode class_mode,

                              Symbol* method_name, Mode method_mode,

                              Symbol* signature, const char * opt, MethodMatcher* next):

     MethodMatcher(class_name, class_mode, method_name, method_mode, signature, next) {

     option = opt;

   }

   bool match(methodHandle method, const char* opt) {

     MethodOptionMatcher* current = this;

     while (current != NULL) {

       current = (MethodOptionMatcher*)current->find(method);

       if (current == NULL) {

         return false;

       }

       if (strcmp(current->option, opt) == 0) {

         return true;

       }

       current = current->next();

     }

     return false;

   }

   MethodOptionMatcher* next() {

     return (MethodOptionMatcher*)_next;

   }

   virtual void print() {

     print_base();

     tty->print(" %s", option);

     tty->cr();

   }

 };

 // this must parallel the command_names below

 enum OracleCommand {

   UnknownCommand = -1,

   OracleFirstCommand = 0,

   BreakCommand = OracleFirstCommand,

   PrintCommand,

   ExcludeCommand,

   InlineCommand,

   DontInlineCommand,

   CompileOnlyCommand,

   LogCommand,

   OptionCommand,

   QuietCommand,

   HelpCommand,

   OracleCommandCount

 };

 // this must parallel the enum OracleCommand

 static const char * command_names[] = {

   "break",

   "print",

   "exclude",

   "inline",

   "dontinline",

   "compileonly",

   "log",

   "option",

   "quiet",

   "help"

 };

 static const char * command_name(OracleCommand command) {

   if (command < OracleFirstCommand || command >= OracleCommandCount) {

     return "unknown command";

   }

   return command_names[command];

 }

 class MethodMatcher;

 static MethodMatcher* lists[OracleCommandCount] = { 0, };

 static bool check_predicate(OracleCommand command, methodHandle method) {

   return ((lists[command] != NULL) &&

           !method.is_null() &&

           lists[command]->match(method));

 }

 static MethodMatcher* add_predicate(OracleCommand command,

                                     Symbol* class_name, MethodMatcher::Mode c_mode,

                                     Symbol* method_name, MethodMatcher::Mode m_mode,

                                     Symbol* signature) {

   assert(command != OptionCommand, "must use add_option_string");

   if (command == LogCommand && !LogCompilation && lists[LogCommand] == NULL)

     tty->print_cr("Warning:  +LogCompilation must be enabled in order for individual methods to be logged.");

   lists[command] = new MethodMatcher(class_name, c_mode, method_name, m_mode, signature, lists[command]);

   return lists[command];

 }

 static MethodMatcher* add_option_string(Symbol* class_name, MethodMatcher::Mode c_mode,

                                         Symbol* method_name, MethodMatcher::Mode m_mode,

                                         Symbol* signature,

                                         const char* option) {

   lists[OptionCommand] = new MethodOptionMatcher(class_name, c_mode, method_name, m_mode,

                                                  signature, option, lists[OptionCommand]);

   return lists[OptionCommand];

 }

 bool CompilerOracle::has_option_string(methodHandle method, const char* option) {

   return lists[OptionCommand] != NULL &&

     ((MethodOptionMatcher*)lists[OptionCommand])->match(method, option);

 }

 bool CompilerOracle::should_exclude(methodHandle method, bool& quietly) {

   quietly = true;

   if (lists[ExcludeCommand] != NULL) {

     if (lists[ExcludeCommand]->match(method)) {

       quietly = _quiet;

       return true;

     }

   }

   if (lists[CompileOnlyCommand] != NULL) {

     return !lists[CompileOnlyCommand]->match(method);

   }

   return false;

 }

 bool CompilerOracle::should_inline(methodHandle method) {

   return (check_predicate(InlineCommand, method));

 }

 bool CompilerOracle::should_not_inline(methodHandle method) {

   return (check_predicate(DontInlineCommand, method));

 }

 bool CompilerOracle::should_print(methodHandle method) {

   return (check_predicate(PrintCommand, method));

 }

 bool CompilerOracle::should_log(methodHandle method) {

   if (!LogCompilation)            return false;

   if (lists[LogCommand] == NULL)  return true;  // by default, log all

   return (check_predicate(LogCommand, method));

 }

 bool CompilerOracle::should_break_at(methodHandle method) {

   return check_predicate(BreakCommand, method);

 }

 static OracleCommand parse_command_name(const char * line, int* bytes_read) {

   assert(ARRAY_SIZE(command_names) == OracleCommandCount,

          "command_names size mismatch");

   *bytes_read = 0;

   char command[33];

   int result = sscanf(line, "%32[a-z]%n", command, bytes_read);

   for (uint i = 0; i < ARRAY_SIZE(command_names); i++) {

     if (strcmp(command, command_names[i]) == 0) {

       return (OracleCommand)i;

     }

   }

   return UnknownCommand;

 }

 static void usage() {

   tty->print_cr("  CompileCommand and the CompilerOracle allows simple control over");

   tty->print_cr("  what's allowed to be compiled.  The standard supported directives");

   tty->print_cr("  are exclude and compileonly.  The exclude directive stops a method");

   tty->print_cr("  from being compiled and compileonly excludes all methods except for");

   tty->print_cr("  the ones mentioned by compileonly directives.  The basic form of");

   tty->print_cr("  all commands is a command name followed by the name of the method");

   tty->print_cr("  in one of two forms: the standard class file format as in");

   tty->print_cr("  class/name.methodName or the PrintCompilation format");

   tty->print_cr("  class.name::methodName.  The method name can optionally be followed");

   tty->print_cr("  by a space then the signature of the method in the class file");

   tty->print_cr("  format.  Otherwise the directive applies to all methods with the");

   tty->print_cr("  same name and class regardless of signature.  Leading and trailing");

   tty->print_cr("  *'s in the class and/or method name allows a small amount of");

   tty->print_cr("  wildcarding.  ");

   tty->cr();

   tty->print_cr("  Examples:");

   tty->cr();

   tty->print_cr("  exclude java/lang/StringBuffer.append");

   tty->print_cr("  compileonly java/lang/StringBuffer.toString ()Ljava/lang/String;");

   tty->print_cr("  exclude java/lang/String*.*");

   tty->print_cr("  exclude *.toString");

 }

 // The characters allowed in a class or method name.  All characters > 0x7f

 // are allowed in order to handle obfuscated class files (e.g. Volano)

 #define RANGEBASE "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789$_<>" \

         "\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f" \

         "\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f" \

         "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf" \

         "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf" \

         "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf" \

         "\xd0\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf" \

         "\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef" \

         "\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff"

 #define RANGE0 "[*" RANGEBASE "]"

 #define RANGEDOT "[*" RANGEBASE ".]"

 #define RANGESLASH "[*" RANGEBASE "/]"

 // Accept several syntaxes for these patterns

 //  original syntax

 //   cmd  java.lang.String foo

 //  PrintCompilation syntax

 //   cmd  java.lang.String::foo

 //  VM syntax

 //   cmd  java/lang/String[. ]foo

 //

 static const char* patterns[] = {

   "%*[ \t]%255" RANGEDOT    " "     "%255"  RANGE0 "%n",

   "%*[ \t]%255" RANGEDOT   "::"     "%255"  RANGE0 "%n",

   "%*[ \t]%255" RANGESLASH "%*[ .]" "%255"  RANGE0 "%n",

 };

 static MethodMatcher::Mode check_mode(char name[], const char*& error_msg) {

   int match = MethodMatcher::Exact;

   while (name[0] == '*') {

     match |= MethodMatcher::Suffix;

     strcpy(name, name + 1);

   }

   if (strcmp(name, "*") == 0) return MethodMatcher::Any;

   size_t len = strlen(name);

   while (len > 0 && name[len - 1] == '*') {

     match |= MethodMatcher::Prefix;

     name[--len] = '\0';

   }

   if (strstr(name, "*") != NULL) {

     error_msg = "  Embedded * not allowed";

     return MethodMatcher::Unknown;

   }

   return (MethodMatcher::Mode)match;

 }

 static bool scan_line(const char * line,

                       char class_name[],  MethodMatcher::Mode* c_mode,

                       char method_name[], MethodMatcher::Mode* m_mode,

                       int* bytes_read, const char*& error_msg) {

   *bytes_read = 0;

   error_msg = NULL;

   for (uint i = 0; i < ARRAY_SIZE(patterns); i++) {

     if (2 == sscanf(line, patterns[i], class_name, method_name, bytes_read)) {

       *c_mode = check_mode(class_name, error_msg);

       *m_mode = check_mode(method_name, error_msg);

       return *c_mode != MethodMatcher::Unknown && *m_mode != MethodMatcher::Unknown;

     }

   }

   return false;

 }

 void CompilerOracle::parse_from_line(char* line) {

   if (line[0] == '\0') return;

   if (line[0] == '#')  return;

   bool have_colon = (strstr(line, "::") != NULL);

   for (char* lp = line; *lp != '\0'; lp++) {

     // Allow '.' to separate the class name from the method name.

     // This is the preferred spelling of methods:

     //      exclude java/lang/String.indexOf(I)I

     // Allow ',' for spaces (eases command line quoting).

     //      exclude,java/lang/String.indexOf

     // For backward compatibility, allow space as separator also.

     //      exclude java/lang/String indexOf

     //      exclude,java/lang/String,indexOf

     // For easy cut-and-paste of method names, allow VM output format

     // as produced by Method::print_short_name:

     //      exclude java.lang.String::indexOf

     // For simple implementation convenience here, convert them all to space.

     if (have_colon) {

       if (*lp == '.')  *lp = '/';   // dots build the package prefix

       if (*lp == ':')  *lp = ' ';

     }

     if (*lp == ',' || *lp == '.')  *lp = ' ';

   }

   char* original_line = line;

   int bytes_read;

   OracleCommand command = parse_command_name(line, &bytes_read);

   line += bytes_read;

   if (command == UnknownCommand) {

     tty->print_cr("CompilerOracle: unrecognized line");

     tty->print_cr("  \"%s\"", original_line);

     return;

   }

   if (command == QuietCommand) {

     _quiet = true;

     return;

   }

   if (command == HelpCommand) {

     usage();

     return;

   }

   MethodMatcher::Mode c_match = MethodMatcher::Exact;

   MethodMatcher::Mode m_match = MethodMatcher::Exact;

   char class_name[256];

   char method_name[256];

   char sig[1024];

   char errorbuf[1024];

   const char* error_msg = NULL;

   MethodMatcher* match = NULL;

   if (scan_line(line, class_name, &c_match, method_name, &m_match, &bytes_read, error_msg)) {

     EXCEPTION_MARK;

     Symbol* c_name = SymbolTable::new_symbol(class_name, CHECK);

     Symbol* m_name = SymbolTable::new_symbol(method_name, CHECK);

     Symbol* signature = NULL;

     line += bytes_read;

     // there might be a signature following the method.

     // signatures always begin with ( so match that by hand

     if (1 == sscanf(line, "%*[ \t](%254[[);/" RANGEBASE "]%n", sig + 1, &bytes_read)) {

       sig[0] = '(';

       line += bytes_read;

       signature = SymbolTable::new_symbol(sig, CHECK);

     }

     if (command == OptionCommand) {

       // Look for trailing options to support

       // ciMethod::has_option("string") to control features in the

       // compiler.  Multiple options may follow the method name.

       char option[256];

       while (sscanf(line, "%*[ \t]%255[a-zA-Z0-9]%n", option, &bytes_read) == 1) {

         if (match != NULL && !_quiet) {

           // Print out the last match added

           tty->print("CompilerOracle: %s ", command_names[command]);

           match->print();

         }

         match = add_option_string(c_name, c_match, m_name, m_match, signature, strdup(option));

         line += bytes_read;

       }

     } else {

       bytes_read = 0;

       sscanf(line, "%*[ \t]%n", &bytes_read);

       if (line[bytes_read] != '\0') {

         jio_snprintf(errorbuf, sizeof(errorbuf), "  Unrecognized text after command: %s", line);

         error_msg = errorbuf;

       } else {

         match = add_predicate(command, c_name, c_match, m_name, m_match, signature);

       }

     }

   }

   if (match != NULL) {

     if (!_quiet) {

       tty->print("CompilerOracle: %s ", command_names[command]);

       match->print();

     }

   } else {

     tty->print_cr("CompilerOracle: unrecognized line");

     tty->print_cr("  \"%s\"", original_line);

     if (error_msg != NULL) {

       tty->print_cr(error_msg);

     }

   }

 }

 static const char* default_cc_file = ".hotspot_compiler";

 static const char* cc_file() {

 #ifdef ASSERT

   if (CompileCommandFile == NULL)

     return default_cc_file;

 #endif

   return CompileCommandFile;

 }

 bool CompilerOracle::has_command_file() {

   return cc_file() != NULL;

 }

 bool CompilerOracle::_quiet = false;

 void CompilerOracle::parse_from_file() {

   assert(has_command_file(), "command file must be specified");

   FILE* stream = fopen(cc_file(), "rt");

   if (stream == NULL) return;

   char token[1024];

   int  pos = 0;

   int  c = getc(stream);

   while(c != EOF) {

     if (c == '\n') {

       token[pos++] = '\0';

       parse_from_line(token);

       pos = 0;

     } else {

       token[pos++] = c;

     }

     c = getc(stream);

   }

   token[pos++] = '\0';

   parse_from_line(token);

   fclose(stream);

 }

 void CompilerOracle::parse_from_string(const char* str, void (*parse_line)(char*)) {

   char token[1024];

   int  pos = 0;

   const char* sp = str;

   int  c = *sp++;

   while (c != '\0') {

     if (c == '\n') {

       token[pos++] = '\0';

       parse_line(token);

       pos = 0;

     } else {

       token[pos++] = c;

     }

     c = *sp++;

   }

   token[pos++] = '\0';

   parse_line(token);

 }

 void CompilerOracle::append_comment_to_file(const char* message) {

   assert(has_command_file(), "command file must be specified");

   fileStream stream(fopen(cc_file(), "at"));

   stream.print("# ");

   for (int index = 0; message[index] != '\0'; index++) {

     stream.put(message[index]);

     if (message[index] == '\n') stream.print("# ");

   }

   stream.cr();

 }

 void CompilerOracle::append_exclude_to_file(methodHandle method) {

   assert(has_command_file(), "command file must be specified");

   fileStream stream(fopen(cc_file(), "at"));

   stream.print("exclude ");

   Klass::cast(method->method_holder())->name()->print_symbol_on(&stream);

   stream.print(".");

   method->name()->print_symbol_on(&stream);

   method->signature()->print_symbol_on(&stream);

   stream.cr();

   stream.cr();

 }

 void compilerOracle_init() {

   CompilerOracle::parse_from_string(CompileCommand, CompilerOracle::parse_from_line);

   CompilerOracle::parse_from_string(CompileOnly, CompilerOracle::parse_compile_only);

   if (CompilerOracle::has_command_file()) {

     CompilerOracle::parse_from_file();

   } else {

     struct stat buf;

     if (os::stat(default_cc_file, &buf) == 0) {

       warning("%s file is present but has been ignored.  "

               "Run with -XX:CompileCommandFile=%s to load the file.",

               default_cc_file, default_cc_file);

     }

   }

   if (lists[PrintCommand] != NULL) {

     if (PrintAssembly) {

       warning("CompileCommand and/or %s file contains 'print' commands, but PrintAssembly is also enabled", default_cc_file);

     } else if (FLAG_IS_DEFAULT(DebugNonSafepoints)) {

       warning("printing of assembly code is enabled; turning on DebugNonSafepoints to gain additional output");

       DebugNonSafepoints = true;

     }

   }

 }

 void CompilerOracle::parse_compile_only(char * line) {

   int i;

   char name[1024];

   const char* className = NULL;

   const char* methodName = NULL;

   bool have_colon = (strstr(line, "::") != NULL);

   char method_sep = have_colon ? ':' : '.';

   if (Verbose) {

     tty->print_cr(line);

   }

   ResourceMark rm;

   while (*line != '\0') {

     MethodMatcher::Mode c_match = MethodMatcher::Exact;

     MethodMatcher::Mode m_match = MethodMatcher::Exact;

     for (i = 0;

          i < 1024 && *line != '\0' && *line != method_sep && *line != ',' && !isspace(*line);

          line++, i++) {

       name[i] = *line;

       if (name[i] == '.')  name[i] = '/';  // package prefix uses '/'

     }

     if (i > 0) {

       char* newName = NEW_RESOURCE_ARRAY( char, i + 1);

       if (newName == NULL)

         return;

       strncpy(newName, name, i);

       newName[i] = '\0';

       if (className == NULL) {

         className = newName;

         c_match = MethodMatcher::Prefix;

       } else {

         methodName = newName;

       }

     }

     if (*line == method_sep) {

       if (className == NULL) {

         className = "";

         c_match = MethodMatcher::Any;

       } else {

         // foo/bar.blah is an exact match on foo/bar, bar.blah is a suffix match on bar

         if (strchr(className, '/') != NULL) {

           c_match = MethodMatcher::Exact;

         } else {

           c_match = MethodMatcher::Suffix;

         }

       }

     } else {

       // got foo or foo/bar

       if (className == NULL) {

         ShouldNotReachHere();

       } else {

         // got foo or foo/bar

         if (strchr(className, '/') != NULL) {

           c_match = MethodMatcher::Prefix;

         } else if (className[0] == '\0') {

           c_match = MethodMatcher::Any;

         } else {

           c_match = MethodMatcher::Substring;

         }

       }

     }

     // each directive is terminated by , or NUL or . followed by NUL

     if (*line == ',' || *line == '\0' || (line[0] == '.' && line[1] == '\0')) {

       if (methodName == NULL) {

         methodName = "";

         if (*line != method_sep) {

           m_match = MethodMatcher::Any;

         }

       }

       EXCEPTION_MARK;

       Symbol* c_name = SymbolTable::new_symbol(className, CHECK);

       Symbol* m_name = SymbolTable::new_symbol(methodName, CHECK);

       Symbol* signature = NULL;

       add_predicate(CompileOnlyCommand, c_name, c_match, m_name, m_match, signature);

       if (PrintVMOptions) {

         tty->print("CompileOnly: compileonly ");

         lists[CompileOnlyCommand]->print();

       }

       className = NULL;

       methodName = NULL;

     }

     line = *line == '\0' ? line : line + 1;

   }

 }