CodeLocation.cpp


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59

/*
    This file is part of cpp-ethereum.

    cpp-ethereum is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    cpp-ethereum is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with cpp-ethereum.  If not, see <http://www.gnu.org/licenses/>.
*/
/** @file CodeLocation.cpp
 * @author Gav Wood <i@gavwood.com>
 * @date 2014
 */

#include "CodeLocation.h"
#include "CodeFragment.h"
using namespace std;
using namespace eth;

CodeLocation::CodeLocation(CodeFragment* _f)
{
    m_f = _f;
    m_pos = _f->m_code.size();
}

unsigned CodeLocation::get() const
{
    assert(m_f->m_code[m_pos - 1] == (byte)Instruction::PUSH4);
    bytesConstRef r(&m_f->m_code[m_pos], 4);
    return fromBigEndian<uint32_t>(r);
}

void CodeLocation::set(unsigned _val)
{
    assert(m_f->m_code[m_pos - 1] == (byte)Instruction::PUSH4);
    assert(!get());
    bytesRef r(&m_f->m_code[m_pos], 4);
    toBigEndian(_val, r);
}

void CodeLocation::anchor()
{
    set(m_f->m_code.size());
}

void CodeLocation::increase(unsigned _val)
{
    assert(m_f->m_code[m_pos - 1] == (byte)Instruction::PUSH4);
    bytesRef r(&m_f->m_code[m_pos], 4);
    toBigEndian(get() + _val, r);
}