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6924259: Remove String.count/String.offset

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Allow a version of String class that doesn't have count and offset fields.

Reviewed-by: never, coleenp
This commit is contained in:
Vladimir Kozlov 2012-05-14 09:36:00 -07:00
parent 17b26a6a0c
commit eb4a860bc3
12 changed files with 365 additions and 191 deletions
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80
hotspot/src/share/vm/opto/graphKit.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2001, 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
@ -3748,3 +3748,81 @@ void GraphKit::g1_write_barrier_post(Node* oop_store,
final_sync(ideal);
}
#undef __
Node* GraphKit::load_String_offset(Node* ctrl, Node* str) {
if (java_lang_String::has_offset_field()) {
int offset_offset = java_lang_String::offset_offset_in_bytes();
const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
false, NULL, 0);
const TypePtr* offset_field_type = string_type->add_offset(offset_offset);
int offset_field_idx = C->get_alias_index(offset_field_type);
return make_load(ctrl,
basic_plus_adr(str, str, offset_offset),
TypeInt::INT, T_INT, offset_field_idx);
} else {
return intcon(0);
}
}
Node* GraphKit::load_String_length(Node* ctrl, Node* str) {
if (java_lang_String::has_count_field()) {
int count_offset = java_lang_String::count_offset_in_bytes();
const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
false, NULL, 0);
const TypePtr* count_field_type = string_type->add_offset(count_offset);
int count_field_idx = C->get_alias_index(count_field_type);
return make_load(ctrl,
basic_plus_adr(str, str, count_offset),
TypeInt::INT, T_INT, count_field_idx);
} else {
return load_array_length(load_String_value(ctrl, str));
}
}
Node* GraphKit::load_String_value(Node* ctrl, Node* str) {
int value_offset = java_lang_String::value_offset_in_bytes();
const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
false, NULL, 0);
const TypePtr* value_field_type = string_type->add_offset(value_offset);
const TypeAryPtr* value_type = TypeAryPtr::make(TypePtr::NotNull,
TypeAry::make(TypeInt::CHAR,TypeInt::POS),
ciTypeArrayKlass::make(T_CHAR), true, 0);
int value_field_idx = C->get_alias_index(value_field_type);
return make_load(ctrl, basic_plus_adr(str, str, value_offset),
value_type, T_OBJECT, value_field_idx);
}
void GraphKit::store_String_offset(Node* ctrl, Node* str, Node* value) {
int offset_offset = java_lang_String::offset_offset_in_bytes();
const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
false, NULL, 0);
const TypePtr* offset_field_type = string_type->add_offset(offset_offset);
int offset_field_idx = C->get_alias_index(offset_field_type);
store_to_memory(ctrl, basic_plus_adr(str, offset_offset),
value, T_INT, offset_field_idx);
}
void GraphKit::store_String_value(Node* ctrl, Node* str, Node* value) {
int value_offset = java_lang_String::value_offset_in_bytes();
const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
false, NULL, 0);
const TypePtr* value_field_type = string_type->add_offset(value_offset);
const TypeAryPtr* value_type = TypeAryPtr::make(TypePtr::NotNull,
TypeAry::make(TypeInt::CHAR,TypeInt::POS),
ciTypeArrayKlass::make(T_CHAR), true, 0);
int value_field_idx = C->get_alias_index(value_field_type);
store_to_memory(ctrl, basic_plus_adr(str, value_offset),
value, T_OBJECT, value_field_idx);
}
void GraphKit::store_String_length(Node* ctrl, Node* str, Node* value) {
int count_offset = java_lang_String::count_offset_in_bytes();
const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::NotNull, C->env()->String_klass(),
false, NULL, 0);
const TypePtr* count_field_type = string_type->add_offset(count_offset);
int count_field_idx = C->get_alias_index(count_field_type);
store_to_memory(ctrl, basic_plus_adr(str, count_offset),
value, T_INT, count_field_idx);
}