1 /* 2 * Copyright (c) 1999, 2007, Oracle and/or its affiliates. All rights reserved. 3 * Copyright 2009 Red Hat, Inc. 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 5 * 6 * This code is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License version 2 only, as 8 * published by the Free Software Foundation. 9 * 10 * This code is distributed in the hope that it will be useful, but WITHOUT 11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 13 * version 2 for more details (a copy is included in the LICENSE file that 14 * accompanied this code). 15 * 16 * You should have received a copy of the GNU General Public License version 17 * 2 along with this work; if not, write to the Free Software Foundation, 18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 19 * 20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 21 * or visit www.oracle.com if you need additional information or have any 22 * questions. 23 * 24 */ 25 26 class SharkCodeBuffer : public StackObj { 27 public: 28 SharkCodeBuffer(MacroAssembler* masm) 29 : _masm(masm), _base_pc(NULL) {} 30 31 private: 32 MacroAssembler* _masm; 33 llvm::Value* _base_pc; 34 35 private: 36 MacroAssembler* masm() const { 37 return _masm; 38 } 39 40 public: 41 llvm::Value* base_pc() const { 42 return _base_pc; 43 } 44 void set_base_pc(llvm::Value* base_pc) { 45 assert(_base_pc == NULL, "only do this once"); 46 _base_pc = base_pc; 47 } 48 49 // Allocate some space in the buffer and return its address. 50 // This buffer will have been relocated by the time the method 51 // is installed, so you can't inline the result in code. 52 public: 53 void* malloc(size_t size) const { 54 masm()->align(BytesPerWord); 55 void *result = masm()->pc(); 56 masm()->advance(size); 57 return result; 58 } 59 60 // Create a unique offset in the buffer. 61 public: 62 int create_unique_offset() const { 63 int offset = masm()->offset(); 64 masm()->advance(1); 65 return offset; 66 } 67 68 // Inline an oop into the buffer and return its offset. 69 public: 70 int inline_oop(jobject object) const { 71 masm()->align(BytesPerWord); 72 int offset = masm()->offset(); 73 masm()->store_oop(object); 74 return offset; 75 } 76 77 // Inline a block of non-oop data into the buffer and return its offset. 78 public: 79 int inline_data(void *src, size_t size) const { 80 masm()->align(BytesPerWord); 81 int offset = masm()->offset(); 82 void *dst = masm()->pc(); 83 masm()->advance(size); 84 memcpy(dst, src, size); 85 return offset; 86 } 87 };