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
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
|
#pragma once
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#endif
//===-- RTDyldMemoryManager.cpp - Memory manager for MC-JIT -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// Interface of the runtime dynamic memory manager base class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_EXECUTIONENGINE_RTDYLDMEMORYMANAGER_H
#define LLVM_EXECUTIONENGINE_RTDYLDMEMORYMANAGER_H
#include "llvm-c/ExecutionEngine.h"
#include "llvm/ExecutionEngine/JITSymbol.h"
#include "llvm/ExecutionEngine/RuntimeDyld.h"
#include "llvm/Support/CBindingWrapping.h"
#include <cstddef>
#include <cstdint>
#include <string>
namespace llvm {
class ExecutionEngine;
namespace object {
class ObjectFile;
} // end namespace object
class MCJITMemoryManager : public RuntimeDyld::MemoryManager {
public:
// Don't hide the notifyObjectLoaded method from RuntimeDyld::MemoryManager.
using RuntimeDyld::MemoryManager::notifyObjectLoaded;
/// This method is called after an object has been loaded into memory but
/// before relocations are applied to the loaded sections. The object load
/// may have been initiated by MCJIT to resolve an external symbol for another
/// object that is being finalized. In that case, the object about which
/// the memory manager is being notified will be finalized immediately after
/// the memory manager returns from this call.
///
/// Memory managers which are preparing code for execution in an external
/// address space can use this call to remap the section addresses for the
/// newly loaded object.
virtual void notifyObjectLoaded(ExecutionEngine *EE,
const object::ObjectFile &) {}
private:
void anchor() override;
};
// RuntimeDyld clients often want to handle the memory management of
// what gets placed where. For JIT clients, this is the subset of
// JITMemoryManager required for dynamic loading of binaries.
//
// FIXME: As the RuntimeDyld fills out, additional routines will be needed
// for the varying types of objects to be allocated.
class RTDyldMemoryManager : public MCJITMemoryManager,
public LegacyJITSymbolResolver {
public:
RTDyldMemoryManager() = default;
RTDyldMemoryManager(const RTDyldMemoryManager&) = delete;
void operator=(const RTDyldMemoryManager&) = delete;
~RTDyldMemoryManager() override;
/// Register EH frames in the current process.
static void registerEHFramesInProcess(uint8_t *Addr, size_t Size);
/// Deregister EH frames in the current proces.
static void deregisterEHFramesInProcess(uint8_t *Addr, size_t Size);
void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size) override;
void deregisterEHFrames() override;
/// This method returns the address of the specified function or variable in
/// the current process.
static uint64_t getSymbolAddressInProcess(const std::string &Name);
/// Legacy symbol lookup - DEPRECATED! Please override findSymbol instead.
///
/// This method returns the address of the specified function or variable.
/// It is used to resolve symbols during module linking.
virtual uint64_t getSymbolAddress(const std::string &Name) {
return getSymbolAddressInProcess(Name);
}
/// This method returns a RuntimeDyld::SymbolInfo for the specified function
/// or variable. It is used to resolve symbols during module linking.
///
/// By default this falls back on the legacy lookup method:
/// 'getSymbolAddress'. The address returned by getSymbolAddress is treated as
/// a strong, exported symbol, consistent with historical treatment by
/// RuntimeDyld.
///
/// Clients writing custom RTDyldMemoryManagers are encouraged to override
/// this method and return a SymbolInfo with the flags set correctly. This is
/// necessary for RuntimeDyld to correctly handle weak and non-exported symbols.
JITSymbol findSymbol(const std::string &Name) override {
return JITSymbol(getSymbolAddress(Name), JITSymbolFlags::Exported);
}
/// Legacy symbol lookup -- DEPRECATED! Please override
/// findSymbolInLogicalDylib instead.
///
/// Default to treating all modules as separate.
virtual uint64_t getSymbolAddressInLogicalDylib(const std::string &Name) {
return 0;
}
/// Default to treating all modules as separate.
///
/// By default this falls back on the legacy lookup method:
/// 'getSymbolAddressInLogicalDylib'. The address returned by
/// getSymbolAddressInLogicalDylib is treated as a strong, exported symbol,
/// consistent with historical treatment by RuntimeDyld.
///
/// Clients writing custom RTDyldMemoryManagers are encouraged to override
/// this method and return a SymbolInfo with the flags set correctly. This is
/// necessary for RuntimeDyld to correctly handle weak and non-exported symbols.
JITSymbol
findSymbolInLogicalDylib(const std::string &Name) override {
return JITSymbol(getSymbolAddressInLogicalDylib(Name),
JITSymbolFlags::Exported);
}
/// This method returns the address of the specified function. As such it is
/// only useful for resolving library symbols, not code generated symbols.
///
/// If \p AbortOnFailure is false and no function with the given name is
/// found, this function returns a null pointer. Otherwise, it prints a
/// message to stderr and aborts.
///
/// This function is deprecated for memory managers to be used with
/// MCJIT or RuntimeDyld. Use getSymbolAddress instead.
virtual void *getPointerToNamedFunction(const std::string &Name,
bool AbortOnFailure = true);
protected:
struct EHFrame {
uint8_t *Addr;
size_t Size;
};
typedef std::vector<EHFrame> EHFrameInfos;
EHFrameInfos EHFrames;
private:
void anchor() override;
};
// Create wrappers for C Binding types (see CBindingWrapping.h).
DEFINE_SIMPLE_CONVERSION_FUNCTIONS(
RTDyldMemoryManager, LLVMMCJITMemoryManagerRef)
} // end namespace llvm
#endif // LLVM_EXECUTIONENGINE_RTDYLDMEMORYMANAGER_H
#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif
|
