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comparison src/cpu/x86/vm/c1_LIRAssembler_x86.cpp @ 6057:8f972594effc

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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 3576af4cb939
children 6759698e3140
comparison
equal deleted inserted replaced
6054:56d1af561395 6057:8f972594effc
1 /* 1 /*
2 * Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
503 __ movptr (rbx, rcx); // receiver is in rcx 503 __ movptr (rbx, rcx); // receiver is in rcx
504 __ movptr (rax, arg1->as_register()); 504 __ movptr (rax, arg1->as_register());
505 505
506 // Get addresses of first characters from both Strings 506 // Get addresses of first characters from both Strings
507 __ load_heap_oop(rsi, Address(rax, java_lang_String::value_offset_in_bytes())); 507 __ load_heap_oop(rsi, Address(rax, java_lang_String::value_offset_in_bytes()));
508 __ movptr (rcx, Address(rax, java_lang_String::offset_offset_in_bytes())); 508 if (java_lang_String::has_offset_field()) {
509 __ lea (rsi, Address(rsi, rcx, Address::times_2, arrayOopDesc::base_offset_in_bytes(T_CHAR))); 509 __ movptr (rcx, Address(rax, java_lang_String::offset_offset_in_bytes()));
510 510 __ movl (rax, Address(rax, java_lang_String::count_offset_in_bytes()));
511 __ lea (rsi, Address(rsi, rcx, Address::times_2, arrayOopDesc::base_offset_in_bytes(T_CHAR)));
512 } else {
513 __ movl (rax, Address(rsi, arrayOopDesc::length_offset_in_bytes()));
514 __ lea (rsi, Address(rsi, arrayOopDesc::base_offset_in_bytes(T_CHAR)));
515 }
511 516
512 // rbx, may be NULL 517 // rbx, may be NULL
513 add_debug_info_for_null_check_here(info); 518 add_debug_info_for_null_check_here(info);
514 __ load_heap_oop(rdi, Address(rbx, java_lang_String::value_offset_in_bytes())); 519 __ load_heap_oop(rdi, Address(rbx, java_lang_String::value_offset_in_bytes()));
515 __ movptr (rcx, Address(rbx, java_lang_String::offset_offset_in_bytes())); 520 if (java_lang_String::has_offset_field()) {
516 __ lea (rdi, Address(rdi, rcx, Address::times_2, arrayOopDesc::base_offset_in_bytes(T_CHAR))); 521 __ movptr (rcx, Address(rbx, java_lang_String::offset_offset_in_bytes()));
522 __ movl (rbx, Address(rbx, java_lang_String::count_offset_in_bytes()));
523 __ lea (rdi, Address(rdi, rcx, Address::times_2, arrayOopDesc::base_offset_in_bytes(T_CHAR)));
524 } else {
525 __ movl (rbx, Address(rdi, arrayOopDesc::length_offset_in_bytes()));
526 __ lea (rdi, Address(rdi, arrayOopDesc::base_offset_in_bytes(T_CHAR)));
527 }
517 528
518 // compute minimum length (in rax) and difference of lengths (on top of stack) 529 // compute minimum length (in rax) and difference of lengths (on top of stack)
519 __ movl (rbx, Address(rbx, java_lang_String::count_offset_in_bytes()));
520 __ movl (rax, Address(rax, java_lang_String::count_offset_in_bytes()));
521 __ mov (rcx, rbx); 530 __ mov (rcx, rbx);
522 __ subptr(rbx, rax); // subtract lengths 531 __ subptr(rbx, rax); // subtract lengths
523 __ push (rbx); // result 532 __ push (rbx); // result
524 __ cmov (Assembler::lessEqual, rax, rcx); 533 __ cmov (Assembler::lessEqual, rax, rcx);
525 534