1/*
2 * Copyright (c) 1999, 2010, 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#ifndef SHARE_VM_SHARK_SHARKCODEBUFFER_HPP
27#define SHARE_VM_SHARK_SHARKCODEBUFFER_HPP
28
29#include "asm/codeBuffer.hpp"
30#include "memory/allocation.hpp"
31#include "shark/llvmHeaders.hpp"
32
33class SharkCodeBuffer : public StackObj {
34 public:
35  SharkCodeBuffer(MacroAssembler* masm)
36    : _masm(masm), _base_pc(NULL) {}
37
38 private:
39  MacroAssembler* _masm;
40  llvm::Value*    _base_pc;
41
42 private:
43  MacroAssembler* masm() const {
44    return _masm;
45  }
46
47 public:
48  llvm::Value* base_pc() const {
49    return _base_pc;
50  }
51  void set_base_pc(llvm::Value* base_pc) {
52    assert(_base_pc == NULL, "only do this once");
53    _base_pc = base_pc;
54  }
55
56  // Allocate some space in the buffer and return its address.
57  // This buffer will have been relocated by the time the method
58  // is installed, so you can't inline the result in code.
59 public:
60  void* malloc(size_t size) const {
61    masm()->align(BytesPerWord);
62    void *result = masm()->pc();
63    masm()->advance(size);
64    return result;
65  }
66
67  // Create a unique offset in the buffer.
68 public:
69  int create_unique_offset() const {
70    int offset = masm()->offset();
71    masm()->advance(1);
72    return offset;
73  }
74
75  // Inline an oop into the buffer and return its offset.
76 public:
77  int inline_oop(jobject object) const {
78    masm()->align(BytesPerWord);
79    int offset = masm()->offset();
80    masm()->store_oop(object);
81    return offset;
82  }
83
84  int inline_Metadata(Metadata* metadata) const {
85    masm()->align(BytesPerWord);
86    int offset = masm()->offset();
87    masm()->store_Metadata(metadata);
88    return offset;
89  }
90
91  // Inline a block of non-oop data into the buffer and return its offset.
92 public:
93  int inline_data(void *src, size_t size) const {
94    masm()->align(BytesPerWord);
95    int offset = masm()->offset();
96    void *dst = masm()->pc();
97    masm()->advance(size);
98    memcpy(dst, src, size);
99    return offset;
100  }
101};
102
103#endif // SHARE_VM_SHARK_SHARKCODEBUFFER_HPP
104