1//===- JITEventListener.h - Exposes events from JIT compilation -*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file defines the JITEventListener interface, which lets users get
10// callbacks when significant events happen during the JIT compilation process.
11//
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_EXECUTIONENGINE_JITEVENTLISTENER_H
15#define LLVM_EXECUTIONENGINE_JITEVENTLISTENER_H
16
17#include "llvm-c/ExecutionEngine.h"
18#include "llvm/Config/llvm-config.h"
19#include "llvm/ExecutionEngine/RuntimeDyld.h"
20#include "llvm/IR/DebugLoc.h"
21#include "llvm/Support/CBindingWrapping.h"
22#include <cstdint>
23
24namespace llvm {
25
26class IntelJITEventsWrapper;
27class OProfileWrapper;
28
29namespace object {
30
31class ObjectFile;
32
33} // end namespace object
34
35/// JITEventListener - Abstract interface for use by the JIT to notify clients
36/// about significant events during compilation. For example, to notify
37/// profilers and debuggers that need to know where functions have been emitted.
38///
39/// The default implementation of each method does nothing.
40class JITEventListener {
41public:
42 using ObjectKey = uint64_t;
43
44 JITEventListener() = default;
45 virtual ~JITEventListener() = default;
46
47 /// notifyObjectLoaded - Called after an object has had its sections allocated
48 /// and addresses assigned to all symbols. Note: Section memory will not have
49 /// been relocated yet. notifyFunctionLoaded will not be called for
50 /// individual functions in the object.
51 ///
52 /// ELF-specific information
53 /// The ObjectImage contains the generated object image
54 /// with section headers updated to reflect the address at which sections
55 /// were loaded and with relocations performed in-place on debug sections.
56 virtual void notifyObjectLoaded(ObjectKey K, const object::ObjectFile &Obj,
57 const RuntimeDyld::LoadedObjectInfo &L) {}
58
59 /// notifyFreeingObject - Called just before the memory associated with
60 /// a previously emitted object is released.
61 virtual void notifyFreeingObject(ObjectKey K) {}
62
63 // Get a pointer to the GDB debugger registration listener.
64 static JITEventListener *createGDBRegistrationListener();
65
66#if LLVM_USE_INTEL_JITEVENTS
67 // Construct an IntelJITEventListener
68 static JITEventListener *createIntelJITEventListener();
69
70 // Construct an IntelJITEventListener with a test Intel JIT API implementation
71 static JITEventListener *createIntelJITEventListener(
72 IntelJITEventsWrapper* AlternativeImpl);
73#else
74 static JITEventListener *createIntelJITEventListener() { return nullptr; }
75
76 static JITEventListener *createIntelJITEventListener(
77 IntelJITEventsWrapper* AlternativeImpl) {
78 return nullptr;
79 }
80#endif // USE_INTEL_JITEVENTS
81
82#if LLVM_USE_OPROFILE
83 // Construct an OProfileJITEventListener
84 static JITEventListener *createOProfileJITEventListener();
85
86 // Construct an OProfileJITEventListener with a test opagent implementation
87 static JITEventListener *createOProfileJITEventListener(
88 OProfileWrapper* AlternativeImpl);
89#else
90 static JITEventListener *createOProfileJITEventListener() { return nullptr; }
91
92 static JITEventListener *createOProfileJITEventListener(
93 OProfileWrapper* AlternativeImpl) {
94 return nullptr;
95 }
96#endif // USE_OPROFILE
97
98#if LLVM_USE_PERF
99 static JITEventListener *createPerfJITEventListener();
100#else
101 static JITEventListener *createPerfJITEventListener()
102 {
103 return nullptr;
104 }
105#endif // USE_PERF
106
107private:
108 virtual void anchor();
109};
110
111DEFINE_SIMPLE_CONVERSION_FUNCTIONS(JITEventListener, LLVMJITEventListenerRef)
112
113} // end namespace llvm
114
115#endif // LLVM_EXECUTIONENGINE_JITEVENTLISTENER_H
116

source code of llvm/include/llvm/ExecutionEngine/JITEventListener.h