blob: 58696737e8bbba7362730d813a7b389062e66de3 (
plain) (
blame)
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
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#pragma once
#include <cstddef>
#include "common/common_types.h"
#include "common/memory_util.h"
// Everything that needs to generate code should inherit from this.
// You get memory management for free, plus, you can use all emitter functions without
// having to prefix them with gen-> or something similar.
// Example implementation:
// class JIT : public CodeBlock<ARMXEmitter> {}
template <class T>
class CodeBlock : public T, NonCopyable {
private:
// A privately used function to set the executable RAM space to something invalid.
// For debugging usefulness it should be used to set the RAM to a host specific breakpoint
// instruction
virtual void PoisonMemory() = 0;
protected:
u8* region;
size_t region_size;
public:
CodeBlock() : region(nullptr), region_size(0) {
}
virtual ~CodeBlock() {
if (region)
FreeCodeSpace();
}
// Call this before you generate any code.
void AllocCodeSpace(int size) {
region_size = size;
region = (u8*)AllocateExecutableMemory(region_size);
T::SetCodePtr(region);
}
// Always clear code space with breakpoints, so that if someone accidentally executes
// uninitialized, it just breaks into the debugger.
void ClearCodeSpace() {
PoisonMemory();
ResetCodePtr();
}
// Call this when shutting down. Don't rely on the destructor, even though it'll do the job.
void FreeCodeSpace() {
#ifdef __SYMBIAN32__
ResetExecutableMemory(region);
#else
FreeMemoryPages(region, region_size);
#endif
region = nullptr;
region_size = 0;
}
bool IsInSpace(const u8* ptr) {
return (ptr >= region) && (ptr < (region + region_size));
}
// Cannot currently be undone. Will write protect the entire code region.
// Start over if you need to change the code (call FreeCodeSpace(), AllocCodeSpace()).
void WriteProtect() {
WriteProtectMemory(region, region_size, true);
}
void ResetCodePtr() {
T::SetCodePtr(region);
}
size_t GetSpaceLeft() const {
return region_size - (T::GetCodePtr() - region);
}
u8* GetBasePtr() {
return region;
}
size_t GetOffset(const u8* ptr) const {
return ptr - region;
}
};
|
