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 /* Copyright (c) 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 "ci/ciMethodData.hpp"

 #include "ci/ciReplay.hpp"

 #include "ci/ciUtilities.hpp"

 #include "compiler/compileBroker.hpp"

 #include "memory/allocation.inline.hpp"

 #include "memory/oopFactory.hpp"

 #include "memory/resourceArea.hpp"

 #include "utilities/copy.hpp"

 #include "utilities/macros.hpp"

 #ifndef PRODUCT

 // ciReplay

 typedef struct _ciMethodDataRecord {

   const char* klass;

   const char* method;

   const char* signature;

   int state;

   int current_mileage;

   intptr_t* data;

   int data_length;

   char* orig_data;

   int orig_data_length;

   int oops_length;

   jobject* oops_handles;

   int* oops_offsets;

 } ciMethodDataRecord;

 typedef struct _ciMethodRecord {

   const char* klass;

   const char* method;

   const char* signature;

   int instructions_size;

   int interpreter_invocation_count;

   int interpreter_throwout_count;

   int invocation_counter;

   int backedge_counter;

 } ciMethodRecord;

 class CompileReplay;

 static CompileReplay* replay_state;

 class CompileReplay : public StackObj {

  private:

   FILE*   stream;

   Thread* thread;

   Handle  protection_domain;

   Handle  loader;

   GrowableArray<ciMethodRecord*>     ci_method_records;

   GrowableArray<ciMethodDataRecord*> ci_method_data_records;

   const char* _error_message;

   char* bufptr;

   char* buffer;

   int   buffer_length;

   int   buffer_end;

   int   line_no;

  public:

   CompileReplay(const char* filename, TRAPS) {

     thread = THREAD;

     loader = Handle(thread, SystemDictionary::java_system_loader());

     stream = fopen(filename, "rt");

     if (stream == NULL) {

       fprintf(stderr, "Can't open replay file %s\n", filename);

     }

     buffer_length = 32;

     buffer = NEW_RESOURCE_ARRAY(char, buffer_length);

     _error_message = NULL;

     test();

   }

   ~CompileReplay() {

     if (stream != NULL) fclose(stream);

   }

   void test() {

     strcpy(buffer, "1 2 foo 4 bar 0x9 \"this is it\"");

     bufptr = buffer;

     assert(parse_int("test") == 1, "what");

     assert(parse_int("test") == 2, "what");

     assert(strcmp(parse_string(), "foo") == 0, "what");

     assert(parse_int("test") == 4, "what");

     assert(strcmp(parse_string(), "bar") == 0, "what");

     assert(parse_intptr_t("test") == 9, "what");

     assert(strcmp(parse_quoted_string(), "this is it") == 0, "what");

   }

   bool had_error() {

     return _error_message != NULL || thread->has_pending_exception();

   }

   bool can_replay() {

     return !(stream == NULL || had_error());

   }

   void report_error(const char* msg) {

     _error_message = msg;

     // Restore the buffer contents for error reporting

     for (int i = 0; i < buffer_end; i++) {

       if (buffer[i] == '\0') buffer[i] = ' ';

     }

   }

   int parse_int(const char* label) {

     if (had_error()) {

       return 0;

     }

     int v = 0;

     int read;

     if (sscanf(bufptr, "%i%n", &v, &read) != 1) {

       report_error(label);

     } else {

       bufptr += read;

     }

     return v;

   }

   intptr_t parse_intptr_t(const char* label) {

     if (had_error()) {

       return 0;

     }

     intptr_t v = 0;

     int read;

     if (sscanf(bufptr, INTPTR_FORMAT "%n", &v, &read) != 1) {

       report_error(label);

     } else {

       bufptr += read;

     }

     return v;

   }

   void skip_ws() {

     // Skip any leading whitespace

     while (*bufptr == ' ' || *bufptr == '\t') {

       bufptr++;

     }

   }

   char* scan_and_terminate(char delim) {

     char* str = bufptr;

     while (*bufptr != delim && *bufptr != '\0') {

       bufptr++;

     }

     if (*bufptr != '\0') {

       *bufptr++ = '\0';

     }

     if (bufptr == str) {

       // nothing here

       return NULL;

     }

     return str;

   }

   char* parse_string() {

     if (had_error()) return NULL;

     skip_ws();

     return scan_and_terminate(' ');

   }

   char* parse_quoted_string() {

     if (had_error()) return NULL;

     skip_ws();

     if (*bufptr == '"') {

       bufptr++;

       return scan_and_terminate('"');

     } else {

       return scan_and_terminate(' ');

     }

   }

   const char* parse_escaped_string() {

     char* result = parse_quoted_string();

     if (result != NULL) {

       unescape_string(result);

     }

     return result;

   }

   // Look for the tag 'tag' followed by an

   bool parse_tag_and_count(const char* tag, int& length) {

     const char* t = parse_string();

     if (t == NULL) {

       return false;

     }

     if (strcmp(tag, t) != 0) {

       report_error(tag);

       return false;

     }

     length = parse_int("parse_tag_and_count");

     return !had_error();

   }

   // Parse a sequence of raw data encoded as bytes and return the

   // resulting data.

   char* parse_data(const char* tag, int& length) {

     if (!parse_tag_and_count(tag, length)) {

       return NULL;

     }

     char * result = NEW_RESOURCE_ARRAY(char, length);

     for (int i = 0; i < length; i++) {

       int val = parse_int("data");

       result[i] = val;

     }

     return result;

   }

   // Parse a standard chunk of data emitted as:

   //   'tag' <length> # # ...

   // Where each # is an intptr_t item

   intptr_t* parse_intptr_data(const char* tag, int& length) {

     if (!parse_tag_and_count(tag, length)) {

       return NULL;

     }

     intptr_t* result = NEW_RESOURCE_ARRAY(intptr_t, length);

     for (int i = 0; i < length; i++) {

       skip_ws();

       intptr_t val = parse_intptr_t("data");

       result[i] = val;

     }

     return result;

   }

   // Parse a possibly quoted version of a symbol into a symbolOop

   Symbol* parse_symbol(TRAPS) {

     const char* str = parse_escaped_string();

     if (str != NULL) {

       Symbol* sym = SymbolTable::lookup(str, (int)strlen(str), CHECK_NULL);

       return sym;

     }

     return NULL;

   }

   // Parse a valid klass name and look it up

   Klass* parse_klass(TRAPS) {

     const char* str = parse_escaped_string();

     Symbol* klass_name = SymbolTable::lookup(str, (int)strlen(str), CHECK_NULL);

     if (klass_name != NULL) {

       Klass* k = SystemDictionary::resolve_or_fail(klass_name, loader, protection_domain, true, THREAD);

       if (HAS_PENDING_EXCEPTION) {

         oop throwable = PENDING_EXCEPTION;

         java_lang_Throwable::print(throwable, tty);

         tty->cr();

         report_error(str);

         return NULL;

       }

       return k;

     }

     return NULL;

   }

   // Lookup a klass

   Klass* resolve_klass(const char* klass, TRAPS) {

     Symbol* klass_name = SymbolTable::lookup(klass, (int)strlen(klass), CHECK_NULL);

     return SystemDictionary::resolve_or_fail(klass_name, loader, protection_domain, true, CHECK_NULL);

   }

   // Parse the standard tuple of <klass> <name> <signature>

   Method* parse_method(TRAPS) {

     InstanceKlass* k = (InstanceKlass*)parse_klass(CHECK_NULL);

     Symbol* method_name = parse_symbol(CHECK_NULL);

     Symbol* method_signature = parse_symbol(CHECK_NULL);

     Method* m = k->find_method(method_name, method_signature);

     if (m == NULL) {

       report_error("can't find method");

     }

     return m;

   }

   // Process each line of the replay file executing each command until

   // the file ends.

   void process(TRAPS) {

     line_no = 1;

     int pos = 0;

     int c = getc(stream);

     while(c != EOF) {

       if (pos + 1 >= buffer_length) {

         int newl = buffer_length * 2;

         char* newb = NEW_RESOURCE_ARRAY(char, newl);

         memcpy(newb, buffer, pos);

         buffer = newb;

         buffer_length = newl;

       }

       if (c == '\n') {

         // null terminate it, reset the pointer and process the line

         buffer[pos] = '\0';

         buffer_end = pos++;

         bufptr = buffer;

         process_command(CHECK);

         if (had_error()) {

           tty->print_cr("Error while parsing line %d: %s\n", line_no, _error_message);

           tty->print_cr("%s", buffer);

           assert(false, "error");

           return;

         }

         pos = 0;

         buffer_end = 0;

         line_no++;

       } else if (c == '\r') {

         // skip LF

       } else {

         buffer[pos++] = c;

       }

       c = getc(stream);

     }

   }

   void process_command(TRAPS) {

     char* cmd = parse_string();

     if (cmd == NULL) {

       return;

     }

     if (strcmp("#", cmd) == 0) {

       // ignore

     } else if (strcmp("compile", cmd) == 0) {

       process_compile(CHECK);

     } else if (strcmp("ciMethod", cmd) == 0) {

       process_ciMethod(CHECK);

     } else if (strcmp("ciMethodData", cmd) == 0) {

       process_ciMethodData(CHECK);

     } else if (strcmp("staticfield", cmd) == 0) {

       process_staticfield(CHECK);

     } else if (strcmp("ciInstanceKlass", cmd) == 0) {

       process_ciInstanceKlass(CHECK);

     } else if (strcmp("instanceKlass", cmd) == 0) {

       process_instanceKlass(CHECK);

 #if INCLUDE_JVMTI

     } else if (strcmp("JvmtiExport", cmd) == 0) {

       process_JvmtiExport(CHECK);

 #endif // INCLUDE_JVMTI

     } else {

       report_error("unknown command");

     }

   }

   // compile <klass> <name> <signature> <entry_bci>

   void process_compile(TRAPS) {

     // methodHandle method;

     Method* method = parse_method(CHECK);

     int entry_bci = parse_int("entry_bci");

     Klass* k = method->method_holder();

     ((InstanceKlass*)k)->initialize(THREAD);

     if (HAS_PENDING_EXCEPTION) {

       oop throwable = PENDING_EXCEPTION;

       java_lang_Throwable::print(throwable, tty);

       tty->cr();

       if (ReplayIgnoreInitErrors) {

         CLEAR_PENDING_EXCEPTION;

         ((InstanceKlass*)k)->set_init_state(InstanceKlass::fully_initialized);

       } else {

         return;

       }

     }

     // Make sure the existence of a prior compile doesn't stop this one

     nmethod* nm = (entry_bci != InvocationEntryBci) ? method->lookup_osr_nmethod_for(entry_bci, CompLevel_full_optimization, true) : method->code();

     if (nm != NULL) {

       nm->make_not_entrant();

     }

     replay_state = this;

     CompileBroker::compile_method(method, entry_bci, CompLevel_full_optimization,

                                   methodHandle(), 0, "replay", THREAD);

     replay_state = NULL;

     reset();

   }

   // ciMethod <klass> <name> <signature> <invocation_counter> <backedge_counter> <interpreter_invocation_count> <interpreter_throwout_count> <instructions_size>

   //

   //

   void process_ciMethod(TRAPS) {

     Method* method = parse_method(CHECK);

     ciMethodRecord* rec = new_ciMethod(method);

     rec->invocation_counter = parse_int("invocation_counter");

     rec->backedge_counter = parse_int("backedge_counter");

     rec->interpreter_invocation_count = parse_int("interpreter_invocation_count");

     rec->interpreter_throwout_count = parse_int("interpreter_throwout_count");

     rec->instructions_size = parse_int("instructions_size");

   }

   // ciMethodData <klass> <name> <signature> <state> <current mileage> orig <length> # # ... data <length> # # ... oops <length>

   void process_ciMethodData(TRAPS) {

     Method* method = parse_method(CHECK);

     /* jsut copied from Method, to build interpret data*/

     if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) {

       return;

     }

     // methodOopDesc::build_interpreter_method_data(method, CHECK);

     {

       // Grab a lock here to prevent multiple

       // MethodData*s from being created.

       MutexLocker ml(MethodData_lock, THREAD);

       if (method->method_data() == NULL) {

         ClassLoaderData* loader_data = method->method_holder()->class_loader_data();

         MethodData* method_data = MethodData::allocate(loader_data, method, CHECK);

         method->set_method_data(method_data);

       }

     }

     // collect and record all the needed information for later

     ciMethodDataRecord* rec = new_ciMethodData(method);

     rec->state = parse_int("state");

     rec->current_mileage = parse_int("current_mileage");

     rec->orig_data = parse_data("orig", rec->orig_data_length);

     if (rec->orig_data == NULL) {

       return;

     }

     rec->data = parse_intptr_data("data", rec->data_length);

     if (rec->data == NULL) {

       return;

     }

     if (!parse_tag_and_count("oops", rec->oops_length)) {

       return;

     }

     rec->oops_handles = NEW_RESOURCE_ARRAY(jobject, rec->oops_length);

     rec->oops_offsets = NEW_RESOURCE_ARRAY(int, rec->oops_length);

     for (int i = 0; i < rec->oops_length; i++) {

       int offset = parse_int("offset");

       if (had_error()) {

         return;

       }

       Klass* k = parse_klass(CHECK);

       rec->oops_offsets[i] = offset;

       rec->oops_handles[i] = (jobject)(new KlassHandle(THREAD, k));

     }

   }

   // instanceKlass <name>

   //

   // Loads and initializes the klass 'name'.  This can be used to

   // create particular class loading environments

   void process_instanceKlass(TRAPS) {

     // just load the referenced class

     Klass* k = parse_klass(CHECK);

   }

   // ciInstanceKlass <name> <is_linked> <is_initialized> <length> tag # # # ...

   //

   // Load the klass 'name' and link or initialize it.  Verify that the

   // constant pool is the same length as 'length' and make sure the

   // constant pool tags are in the same state.

   void process_ciInstanceKlass(TRAPS) {

     InstanceKlass* k = (InstanceKlass *)parse_klass(CHECK);

     int is_linked = parse_int("is_linked");

     int is_initialized = parse_int("is_initialized");

     int length = parse_int("length");

     if (is_initialized) {

       k->initialize(THREAD);

       if (HAS_PENDING_EXCEPTION) {

         oop throwable = PENDING_EXCEPTION;

         java_lang_Throwable::print(throwable, tty);

         tty->cr();

         if (ReplayIgnoreInitErrors) {

           CLEAR_PENDING_EXCEPTION;

           k->set_init_state(InstanceKlass::fully_initialized);

         } else {

           return;

         }

       }

     } else if (is_linked) {

       k->link_class(CHECK);

     }

     ConstantPool* cp = k->constants();

     if (length != cp->length()) {

       report_error("constant pool length mismatch: wrong class files?");

       return;

     }

     int parsed_two_word = 0;

     for (int i = 1; i < length; i++) {

       int tag = parse_int("tag");

       if (had_error()) {

         return;

       }

       switch (cp->tag_at(i).value()) {

         case JVM_CONSTANT_UnresolvedClass: {

           if (tag == JVM_CONSTANT_Class) {

             tty->print_cr("Resolving klass %s at %d", cp->unresolved_klass_at(i)->as_utf8(), i);

             Klass* k = cp->klass_at(i, CHECK);

           }

           break;

         }

         case JVM_CONSTANT_Long:

         case JVM_CONSTANT_Double:

           parsed_two_word = i + 1;

         case JVM_CONSTANT_ClassIndex:

         case JVM_CONSTANT_StringIndex:

         case JVM_CONSTANT_String:

         case JVM_CONSTANT_UnresolvedClassInError:

         case JVM_CONSTANT_Fieldref:

         case JVM_CONSTANT_Methodref:

         case JVM_CONSTANT_InterfaceMethodref:

         case JVM_CONSTANT_NameAndType:

         case JVM_CONSTANT_Utf8:

         case JVM_CONSTANT_Integer:

         case JVM_CONSTANT_Float:

           if (tag != cp->tag_at(i).value()) {

             report_error("tag mismatch: wrong class files?");

             return;

           }

           break;

         case JVM_CONSTANT_Class:

           if (tag == JVM_CONSTANT_Class) {

           } else if (tag == JVM_CONSTANT_UnresolvedClass) {

             tty->print_cr("Warning: entry was unresolved in the replay data");

           } else {

             report_error("Unexpected tag");

             return;

           }

           break;

         case 0:

           if (parsed_two_word == i) continue;

         default:

           ShouldNotReachHere();

           break;

       }

     }

   }

   // Initialize a class and fill in the value for a static field.

   // This is useful when the compile was dependent on the value of

   // static fields but it's impossible to properly rerun the static

   // initiailizer.

   void process_staticfield(TRAPS) {

     InstanceKlass* k = (InstanceKlass *)parse_klass(CHECK);

     if (ReplaySuppressInitializers == 0 ||

         ReplaySuppressInitializers == 2 && k->class_loader() == NULL) {

       return;

     }

     assert(k->is_initialized(), "must be");

     const char* field_name = parse_escaped_string();;

     const char* field_signature = parse_string();

     fieldDescriptor fd;

     Symbol* name = SymbolTable::lookup(field_name, (int)strlen(field_name), CHECK);

     Symbol* sig = SymbolTable::lookup(field_signature, (int)strlen(field_signature), CHECK);

     if (!k->find_local_field(name, sig, &fd) ||

         !fd.is_static() ||

         fd.has_initial_value()) {

       report_error(field_name);

       return;

     }

     oop java_mirror = k->java_mirror();

     if (field_signature[0] == '[') {

       int length = parse_int("array length");

       oop value = NULL;

       if (field_signature[1] == '[') {

         // multi dimensional array

         ArrayKlass* kelem = (ArrayKlass *)parse_klass(CHECK);

         int rank = 0;

         while (field_signature[rank] == '[') {

           rank++;

         }

         int* dims = NEW_RESOURCE_ARRAY(int, rank);

         dims[0] = length;

         for (int i = 1; i < rank; i++) {

           dims[i] = 1; // These aren't relevant to the compiler

         }

         value = kelem->multi_allocate(rank, dims, CHECK);

       } else {

         if (strcmp(field_signature, "[B") == 0) {

           value = oopFactory::new_byteArray(length, CHECK);

         } else if (strcmp(field_signature, "[Z") == 0) {

           value = oopFactory::new_boolArray(length, CHECK);

         } else if (strcmp(field_signature, "[C") == 0) {

           value = oopFactory::new_charArray(length, CHECK);

         } else if (strcmp(field_signature, "[S") == 0) {

           value = oopFactory::new_shortArray(length, CHECK);

         } else if (strcmp(field_signature, "[F") == 0) {

           value = oopFactory::new_singleArray(length, CHECK);

         } else if (strcmp(field_signature, "[D") == 0) {

           value = oopFactory::new_doubleArray(length, CHECK);

         } else if (strcmp(field_signature, "[I") == 0) {

           value = oopFactory::new_intArray(length, CHECK);

         } else if (strcmp(field_signature, "[J") == 0) {

           value = oopFactory::new_longArray(length, CHECK);

         } else if (field_signature[0] == '[' && field_signature[1] == 'L') {

           KlassHandle kelem = resolve_klass(field_signature + 1, CHECK);

           value = oopFactory::new_objArray(kelem(), length, CHECK);

         } else {

           report_error("unhandled array staticfield");

         }

       }

       java_mirror->obj_field_put(fd.offset(), value);

     } else {

       const char* string_value = parse_escaped_string();

       if (strcmp(field_signature, "I") == 0) {

         int value = atoi(string_value);

         java_mirror->int_field_put(fd.offset(), value);

       } else if (strcmp(field_signature, "B") == 0) {

         int value = atoi(string_value);

         java_mirror->byte_field_put(fd.offset(), value);

       } else if (strcmp(field_signature, "C") == 0) {

         int value = atoi(string_value);

         java_mirror->char_field_put(fd.offset(), value);

       } else if (strcmp(field_signature, "S") == 0) {

         int value = atoi(string_value);

         java_mirror->short_field_put(fd.offset(), value);

       } else if (strcmp(field_signature, "Z") == 0) {

         int value = atol(string_value);

         java_mirror->bool_field_put(fd.offset(), value);

       } else if (strcmp(field_signature, "J") == 0) {

         jlong value;

         if (sscanf(string_value, INT64_FORMAT, &value) != 1) {

           fprintf(stderr, "Error parsing long: %s\n", string_value);

           return;

         }

         java_mirror->long_field_put(fd.offset(), value);

       } else if (strcmp(field_signature, "F") == 0) {

         float value = atof(string_value);

         java_mirror->float_field_put(fd.offset(), value);

       } else if (strcmp(field_signature, "D") == 0) {

         double value = atof(string_value);

         java_mirror->double_field_put(fd.offset(), value);

       } else if (strcmp(field_signature, "Ljava/lang/String;") == 0) {

         Handle value = java_lang_String::create_from_str(string_value, CHECK);

         java_mirror->obj_field_put(fd.offset(), value());

       } else if (field_signature[0] == 'L') {

         Symbol* klass_name = SymbolTable::lookup(field_signature, (int)strlen(field_signature), CHECK);

         KlassHandle kelem = resolve_klass(field_signature, CHECK);

         oop value = ((InstanceKlass*)kelem())->allocate_instance(CHECK);

         java_mirror->obj_field_put(fd.offset(), value);

       } else {

         report_error("unhandled staticfield");

       }

     }

   }

 #if INCLUDE_JVMTI

   void process_JvmtiExport(TRAPS) {

     const char* field = parse_string();

     bool value = parse_int("JvmtiExport flag") != 0;

     if (strcmp(field, "can_access_local_variables") == 0) {

       JvmtiExport::set_can_access_local_variables(value);

     } else if (strcmp(field, "can_hotswap_or_post_breakpoint") == 0) {

       JvmtiExport::set_can_hotswap_or_post_breakpoint(value);

     } else if (strcmp(field, "can_post_on_exceptions") == 0) {

       JvmtiExport::set_can_post_on_exceptions(value);

     } else {

       report_error("Unrecognized JvmtiExport directive");

     }

   }

 #endif // INCLUDE_JVMTI

   // Create and initialize a record for a ciMethod

   ciMethodRecord* new_ciMethod(Method* method) {

     ciMethodRecord* rec = NEW_RESOURCE_OBJ(ciMethodRecord);

     rec->klass =  method->method_holder()->name()->as_utf8();

     rec->method = method->name()->as_utf8();

     rec->signature = method->signature()->as_utf8();

     ci_method_records.append(rec);

     return rec;

   }

   // Lookup data for a ciMethod

   ciMethodRecord* find_ciMethodRecord(Method* method) {

     const char* klass_name =  method->method_holder()->name()->as_utf8();

     const char* method_name = method->name()->as_utf8();

     const char* signature = method->signature()->as_utf8();

     for (int i = 0; i < ci_method_records.length(); i++) {

       ciMethodRecord* rec = ci_method_records.at(i);

       if (strcmp(rec->klass, klass_name) == 0 &&

           strcmp(rec->method, method_name) == 0 &&

           strcmp(rec->signature, signature) == 0) {

         return rec;

       }

     }

     return NULL;

   }

   // Create and initialize a record for a ciMethodData

   ciMethodDataRecord* new_ciMethodData(Method* method) {

     ciMethodDataRecord* rec = NEW_RESOURCE_OBJ(ciMethodDataRecord);

     rec->klass =  method->method_holder()->name()->as_utf8();

     rec->method = method->name()->as_utf8();

     rec->signature = method->signature()->as_utf8();

     ci_method_data_records.append(rec);

     return rec;

   }

   // Lookup data for a ciMethodData

   ciMethodDataRecord* find_ciMethodDataRecord(Method* method) {

     const char* klass_name =  method->method_holder()->name()->as_utf8();

     const char* method_name = method->name()->as_utf8();

     const char* signature = method->signature()->as_utf8();

     for (int i = 0; i < ci_method_data_records.length(); i++) {

       ciMethodDataRecord* rec = ci_method_data_records.at(i);

       if (strcmp(rec->klass, klass_name) == 0 &&

           strcmp(rec->method, method_name) == 0 &&

           strcmp(rec->signature, signature) == 0) {

         return rec;

       }

     }

     return NULL;

   }

   const char* error_message() {

     return _error_message;

   }

   void reset() {

     _error_message = NULL;

     ci_method_records.clear();

     ci_method_data_records.clear();

   }

   // Take an ascii string contain \u#### escapes and convert it to utf8

   // in place.

   static void unescape_string(char* value) {

     char* from = value;

     char* to = value;

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

       if (*from != '\\') {

         *from++ = *to++;

       } else {

         switch (from[1]) {

           case 'u': {

             from += 2;

             jchar value=0;

             for (int i=0; i<4; i++) {

               char c = *from++;

               switch (c) {

                 case '0': case '1': case '2': case '3': case '4':

                 case '5': case '6': case '7': case '8': case '9':

                   value = (value << 4) + c - '0';

                   break;

                 case 'a': case 'b': case 'c':

                 case 'd': case 'e': case 'f':

                   value = (value << 4) + 10 + c - 'a';

                   break;

                 case 'A': case 'B': case 'C':

                 case 'D': case 'E': case 'F':

                   value = (value << 4) + 10 + c - 'A';

                   break;

                 default:

                   ShouldNotReachHere();

               }

             }

             UNICODE::convert_to_utf8(&value, 1, to);

             to++;

             break;

           }

           case 't': *to++ = '\t'; from += 2; break;

           case 'n': *to++ = '\n'; from += 2; break;

           case 'r': *to++ = '\r'; from += 2; break;

           case 'f': *to++ = '\f'; from += 2; break;

           default:

             ShouldNotReachHere();

         }

       }

     }

     *from = *to;

   }

 };

 void ciReplay::replay(TRAPS) {

   int exit_code = replay_impl(THREAD);

   Threads::destroy_vm();

   vm_exit(exit_code);

 }

 int ciReplay::replay_impl(TRAPS) {

   HandleMark hm;

   ResourceMark rm;

   // Make sure we don't run with background compilation

   BackgroundCompilation = false;

   if (ReplaySuppressInitializers > 2) {

     // ReplaySuppressInitializers > 2 means that we want to allow

     // normal VM bootstrap but once we get into the replay itself

     // don't allow any intializers to be run.

     ReplaySuppressInitializers = 1;

   }

   // Load and parse the replay data

   CompileReplay rp(ReplayDataFile, THREAD);

   int exit_code = 0;

   if (rp.can_replay()) {

     rp.process(THREAD);

   } else {

     exit_code = 1;

     return exit_code;

   }

   if (HAS_PENDING_EXCEPTION) {

     oop throwable = PENDING_EXCEPTION;

     CLEAR_PENDING_EXCEPTION;

     java_lang_Throwable::print(throwable, tty);

     tty->cr();

     java_lang_Throwable::print_stack_trace(throwable, tty);

     tty->cr();

     exit_code = 2;

   }

   if (rp.had_error()) {

     tty->print_cr("Failed on %s", rp.error_message());

     exit_code = 1;

   }

   return exit_code;

 }

 void ciReplay::initialize(ciMethodData* m) {

   if (replay_state == NULL) {

     return;

   }

   ASSERT_IN_VM;

   ResourceMark rm;

   Method* method = m->get_MethodData()->method();

   ciMethodDataRecord* rec = replay_state->find_ciMethodDataRecord(method);

   if (rec == NULL) {

     // This indicates some mismatch with the original environment and

     // the replay environment though it's not always enough to

     // interfere with reproducing a bug

     tty->print_cr("Warning: requesting ciMethodData record for method with no data: ");

     method->print_name(tty);

     tty->cr();

   } else {

     m->_state = rec->state;

     m->_current_mileage = rec->current_mileage;

     if (rec->data_length != 0) {

       assert(m->_data_size == rec->data_length * (int)sizeof(rec->data[0]), "must agree");

       // Write the correct ciObjects back into the profile data

       ciEnv* env = ciEnv::current();

       for (int i = 0; i < rec->oops_length; i++) {

         KlassHandle *h = (KlassHandle *)rec->oops_handles[i];

         *(ciMetadata**)(rec->data + rec->oops_offsets[i]) =

           env->get_metadata((*h)());

       }

       // Copy the updated profile data into place as intptr_ts

 #ifdef _LP64

       Copy::conjoint_jlongs_atomic((jlong *)rec->data, (jlong *)m->_data, rec->data_length);

 #else

       Copy::conjoint_jints_atomic((jint *)rec->data, (jint *)m->_data, rec->data_length);

 #endif

     }

     // copy in the original header

     Copy::conjoint_jbytes(rec->orig_data, (char*)&m->_orig, rec->orig_data_length);

   }

 }

 bool ciReplay::should_not_inline(ciMethod* method) {

   if (replay_state == NULL) {

     return false;

   }

   VM_ENTRY_MARK;

   // ciMethod without a record shouldn't be inlined.

   return replay_state->find_ciMethodRecord(method->get_Method()) == NULL;

 }

 void ciReplay::initialize(ciMethod* m) {

   if (replay_state == NULL) {

     return;

   }

   ASSERT_IN_VM;

   ResourceMark rm;

   Method* method = m->get_Method();

   ciMethodRecord* rec = replay_state->find_ciMethodRecord(method);

   if (rec == NULL) {

     // This indicates some mismatch with the original environment and

     // the replay environment though it's not always enough to

     // interfere with reproducing a bug

     tty->print_cr("Warning: requesting ciMethod record for method with no data: ");

     method->print_name(tty);

     tty->cr();

   } else {

     // m->_instructions_size = rec->instructions_size;

     m->_instructions_size = -1;

     m->_interpreter_invocation_count = rec->interpreter_invocation_count;

     m->_interpreter_throwout_count = rec->interpreter_throwout_count;

     method->invocation_counter()->_counter = rec->invocation_counter;

     method->backedge_counter()->_counter = rec->backedge_counter;

   }

 }

 bool ciReplay::is_loaded(Method* method) {

   if (replay_state == NULL) {

     return true;

   }

   ASSERT_IN_VM;

   ResourceMark rm;

   ciMethodRecord* rec = replay_state->find_ciMethodRecord(method);

   return rec != NULL;

 }

 #endif // PRODUCT