Mercurial > hg > graal-compiler
diff src/share/vm/classfile/javaClasses.cpp @ 6057:8f972594effc
6924259: Remove String.count/String.offset
Summary: Allow a version of String class that doesn't have count and offset fields.
Reviewed-by: never, coleenp
author | kvn |
---|---|
date | Mon, 14 May 2012 09:36:00 -0700 |
parents | a81f60ddab06 |
children | 8b0a4867acf0 e9140bf80b4a |
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--- a/src/share/vm/classfile/javaClasses.cpp Fri May 11 14:54:35 2012 -0700 +++ b/src/share/vm/classfile/javaClasses.cpp Mon May 14 09:36:00 2012 -0700 @@ -1,5 +1,5 @@ /* - * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. + * Copyright (c) 1997, 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 @@ -143,7 +143,27 @@ } +int java_lang_String::value_offset = 0; +int java_lang_String::offset_offset = 0; +int java_lang_String::count_offset = 0; +int java_lang_String::hash_offset = 0; + +bool java_lang_String::initialized = false; + +void java_lang_String::compute_offsets() { + assert(!initialized, "offsets should be initialized only once"); + + klassOop k = SystemDictionary::String_klass(); + compute_offset(value_offset, k, vmSymbols::value_name(), vmSymbols::char_array_signature()); + compute_optional_offset(offset_offset, k, vmSymbols::offset_name(), vmSymbols::int_signature()); + compute_optional_offset(count_offset, k, vmSymbols::count_name(), vmSymbols::int_signature()); + compute_optional_offset(hash_offset, k, vmSymbols::hash_name(), vmSymbols::int_signature()); + + initialized = true; +} + Handle java_lang_String::basic_create(int length, bool tenured, TRAPS) { + assert(initialized, "Must be initialized"); // Create the String object first, so there's a chance that the String // and the char array it points to end up in the same cache line. oop obj; @@ -2837,10 +2857,6 @@ -int java_lang_String::value_offset; -int java_lang_String::offset_offset; -int java_lang_String::count_offset; -int java_lang_String::hash_offset; int java_lang_Class::_klass_offset; int java_lang_Class::_array_klass_offset; int java_lang_Class::_resolved_constructor_offset; @@ -3000,12 +3016,6 @@ const int x = heapOopSize; const int header = instanceOopDesc::base_offset_in_bytes(); - // Do the String Class - java_lang_String::value_offset = java_lang_String::hc_value_offset * x + header; - java_lang_String::offset_offset = java_lang_String::hc_offset_offset * x + header; - java_lang_String::count_offset = java_lang_String::offset_offset + sizeof (jint); - java_lang_String::hash_offset = java_lang_String::count_offset + sizeof (jint); - // Throwable Class java_lang_Throwable::backtrace_offset = java_lang_Throwable::hc_backtrace_offset * x + header; java_lang_Throwable::detailMessage_offset = java_lang_Throwable::hc_detailMessage_offset * x + header; @@ -3200,9 +3210,13 @@ // java.lang.String CHECK_OFFSET("java/lang/String", java_lang_String, value, "[C"); - CHECK_OFFSET("java/lang/String", java_lang_String, offset, "I"); - CHECK_OFFSET("java/lang/String", java_lang_String, count, "I"); - CHECK_OFFSET("java/lang/String", java_lang_String, hash, "I"); + if (java_lang_String::has_offset_field()) { + CHECK_OFFSET("java/lang/String", java_lang_String, offset, "I"); + CHECK_OFFSET("java/lang/String", java_lang_String, count, "I"); + } + if (java_lang_String::has_hash_field()) { + CHECK_OFFSET("java/lang/String", java_lang_String, hash, "I"); + } // java.lang.Class