1 /* 2 * Copyright (c) 1999, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 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 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef CPU_X86_VM_C1_MACROASSEMBLER_X86_HPP 26 #define CPU_X86_VM_C1_MACROASSEMBLER_X86_HPP 27 28 // C1_MacroAssembler contains high-level macros for C1 29 30 private: 31 int _rsp_offset; // track rsp changes 32 // initialization pd_init()33 void pd_init() { _rsp_offset = 0; } 34 35 public: 36 void try_allocate( 37 Register obj, // result: pointer to object after successful allocation 38 Register var_size_in_bytes, // object size in bytes if unknown at compile time; invalid otherwise 39 int con_size_in_bytes, // object size in bytes if known at compile time 40 Register t1, // temp register 41 Register t2, // temp register 42 Label& slow_case // continuation point if fast allocation fails 43 ); 44 45 void initialize_header(Register obj, Register klass, Register len, Register t1, Register t2); 46 void initialize_body(Register obj, Register len_in_bytes, int hdr_size_in_bytes, Register t1); 47 48 // locking 49 // hdr : must be rax, contents destroyed 50 // obj : must point to the object to lock, contents preserved 51 // disp_hdr: must point to the displaced header location, contents preserved 52 // scratch : scratch register, contents destroyed 53 // returns code offset at which to add null check debug information 54 int lock_object (Register swap, Register obj, Register disp_hdr, Register scratch, Label& slow_case); 55 56 // unlocking 57 // hdr : contents destroyed 58 // obj : must point to the object to lock, contents preserved 59 // disp_hdr: must be eax & must point to the displaced header location, contents destroyed 60 void unlock_object(Register swap, Register obj, Register lock, Label& slow_case); 61 62 void initialize_object( 63 Register obj, // result: pointer to object after successful allocation 64 Register klass, // object klass 65 Register var_size_in_bytes, // object size in bytes if unknown at compile time; invalid otherwise 66 int con_size_in_bytes, // object size in bytes if known at compile time 67 Register t1, // temp register 68 Register t2, // temp register 69 bool is_tlab_allocated // the object was allocated in a TLAB; relevant for the implementation of ZeroTLAB 70 ); 71 72 // allocation of fixed-size objects 73 // (can also be used to allocate fixed-size arrays, by setting 74 // hdr_size correctly and storing the array length afterwards) 75 // obj : must be rax, will contain pointer to allocated object 76 // t1, t2 : scratch registers - contents destroyed 77 // header_size: size of object header in words 78 // object_size: total size of object in words 79 // slow_case : exit to slow case implementation if fast allocation fails 80 void allocate_object(Register obj, Register t1, Register t2, int header_size, int object_size, Register klass, Label& slow_case); 81 82 enum { 83 max_array_allocation_length = 0x00FFFFFF 84 }; 85 86 // allocation of arrays 87 // obj : must be rax, will contain pointer to allocated object 88 // len : array length in number of elements 89 // t : scratch register - contents destroyed 90 // header_size: size of object header in words 91 // f : element scale factor 92 // slow_case : exit to slow case implementation if fast allocation fails 93 void allocate_array(Register obj, Register len, Register t, Register t2, int header_size, Address::ScaleFactor f, Register klass, Label& slow_case); 94 rsp_offset() const95 int rsp_offset() const { return _rsp_offset; } set_rsp_offset(int n)96 void set_rsp_offset(int n) { _rsp_offset = n; } 97 98 // Note: NEVER push values directly, but only through following push_xxx functions; 99 // This helps us to track the rsp changes compared to the entry rsp (->_rsp_offset) 100 push_jint(jint i)101 void push_jint (jint i) { _rsp_offset++; push(i); } push_oop(jobject o)102 void push_oop (jobject o) { _rsp_offset++; pushoop(o); } 103 // Seems to always be in wordSize push_addr(Address a)104 void push_addr (Address a) { _rsp_offset++; pushptr(a); } push_reg(Register r)105 void push_reg (Register r) { _rsp_offset++; push(r); } pop_reg(Register r)106 void pop_reg (Register r) { _rsp_offset--; pop(r); assert(_rsp_offset >= 0, "stack offset underflow"); } 107 dec_stack(int nof_words)108 void dec_stack (int nof_words) { 109 _rsp_offset -= nof_words; 110 assert(_rsp_offset >= 0, "stack offset underflow"); 111 addptr(rsp, wordSize * nof_words); 112 } 113 dec_stack_after_call(int nof_words)114 void dec_stack_after_call (int nof_words) { 115 _rsp_offset -= nof_words; 116 assert(_rsp_offset >= 0, "stack offset underflow"); 117 } 118 119 void invalidate_registers(bool inv_rax, bool inv_rbx, bool inv_rcx, bool inv_rdx, bool inv_rsi, bool inv_rdi) PRODUCT_RETURN; 120 121 // This platform only uses signal-based null checks. The Label is not needed. null_check(Register r,Label * Lnull=NULL)122 void null_check(Register r, Label *Lnull = NULL) { MacroAssembler::null_check(r); } 123 124 void load_parameter(int offset_in_words, Register reg); 125 126 void save_live_registers_no_oop_map(bool save_fpu_registers); 127 void restore_live_registers_except_rax(bool restore_fpu_registers); 128 void restore_live_registers(bool restore_fpu_registers); 129 130 #endif // CPU_X86_VM_C1_MACROASSEMBLER_X86_HPP 131