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
|
#pragma once
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#endif
//===- InstrumentationMap.h - XRay Instrumentation Map ----------*- 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
//
//===----------------------------------------------------------------------===//
//
// Defines the interface for extracting the instrumentation map from an
// XRay-instrumented binary.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_XRAY_INSTRUMENTATION_MAP_H
#define LLVM_XRAY_INSTRUMENTATION_MAP_H
#include "llvm/ADT/Optional.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Error.h"
#include "llvm/Support/YAMLTraits.h"
#include <cstdint>
#include <unordered_map>
#include <vector>
namespace llvm {
namespace xray {
// Forward declare to make a friend.
class InstrumentationMap;
/// Loads the instrumentation map from |Filename|. This auto-deduces the type of
/// the instrumentation map.
Expected<InstrumentationMap> loadInstrumentationMap(StringRef Filename);
/// Represents an XRay instrumentation sled entry from an object file.
struct SledEntry {
/// Each entry here represents the kinds of supported instrumentation map
/// entries.
enum class FunctionKinds { ENTRY, EXIT, TAIL, LOG_ARGS_ENTER, CUSTOM_EVENT };
/// The address of the sled.
uint64_t Address;
/// The address of the function.
uint64_t Function;
/// The kind of sled.
FunctionKinds Kind;
/// Whether the sled was annotated to always be instrumented.
bool AlwaysInstrument;
unsigned char Version;
};
struct YAMLXRaySledEntry {
int32_t FuncId;
yaml::Hex64 Address;
yaml::Hex64 Function;
SledEntry::FunctionKinds Kind;
bool AlwaysInstrument;
std::string FunctionName;
unsigned char Version;
};
/// The InstrumentationMap represents the computed function id's and indicated
/// function addresses from an object file (or a YAML file). This provides an
/// interface to just the mapping between the function id, and the function
/// address.
///
/// We also provide raw access to the actual instrumentation map entries we find
/// associated with a particular object file.
///
class InstrumentationMap {
public:
using FunctionAddressMap = std::unordered_map<int32_t, uint64_t>;
using FunctionAddressReverseMap = std::unordered_map<uint64_t, int32_t>;
using SledContainer = std::vector<SledEntry>;
private:
SledContainer Sleds;
FunctionAddressMap FunctionAddresses;
FunctionAddressReverseMap FunctionIds;
friend Expected<InstrumentationMap> loadInstrumentationMap(StringRef);
public:
/// Provides a raw accessor to the unordered map of function addresses.
const FunctionAddressMap &getFunctionAddresses() { return FunctionAddresses; }
/// Returns an XRay computed function id, provided a function address.
Optional<int32_t> getFunctionId(uint64_t Addr) const;
/// Returns the function address for a function id.
Optional<uint64_t> getFunctionAddr(int32_t FuncId) const;
/// Provide read-only access to the entries of the instrumentation map.
const SledContainer &sleds() const { return Sleds; };
};
} // end namespace xray
namespace yaml {
template <> struct ScalarEnumerationTraits<xray::SledEntry::FunctionKinds> {
static void enumeration(IO &IO, xray::SledEntry::FunctionKinds &Kind) {
IO.enumCase(Kind, "function-enter", xray::SledEntry::FunctionKinds::ENTRY);
IO.enumCase(Kind, "function-exit", xray::SledEntry::FunctionKinds::EXIT);
IO.enumCase(Kind, "tail-exit", xray::SledEntry::FunctionKinds::TAIL);
IO.enumCase(Kind, "log-args-enter",
xray::SledEntry::FunctionKinds::LOG_ARGS_ENTER);
IO.enumCase(Kind, "custom-event",
xray::SledEntry::FunctionKinds::CUSTOM_EVENT);
}
};
template <> struct MappingTraits<xray::YAMLXRaySledEntry> {
static void mapping(IO &IO, xray::YAMLXRaySledEntry &Entry) {
IO.mapRequired("id", Entry.FuncId);
IO.mapRequired("address", Entry.Address);
IO.mapRequired("function", Entry.Function);
IO.mapRequired("kind", Entry.Kind);
IO.mapRequired("always-instrument", Entry.AlwaysInstrument);
IO.mapOptional("function-name", Entry.FunctionName);
IO.mapOptional("version", Entry.Version, 0);
}
static constexpr bool flow = true;
};
} // end namespace yaml
} // end namespace llvm
LLVM_YAML_IS_SEQUENCE_VECTOR(xray::YAMLXRaySledEntry)
#endif // LLVM_XRAY_INSTRUMENTATION_MAP_H
#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif
|
