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
|
#pragma once
#ifdef __GNUC__
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-parameter"
#endif
//===- PseudoProbe.h - Pseudo Probe IR Helpers ------------------*- 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
//
//===----------------------------------------------------------------------===//
//
// Pseudo probe IR intrinsic and dwarf discriminator manipulation routines.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_PSEUDOPROBE_H
#define LLVM_IR_PSEUDOPROBE_H
#include "llvm/ADT/Optional.h"
#include <cassert>
#include <cstdint>
#include <limits>
namespace llvm {
class Instruction;
class BasicBlock;
constexpr const char *PseudoProbeDescMetadataName = "llvm.pseudo_probe_desc";
enum class PseudoProbeType { Block = 0, IndirectCall, DirectCall };
// The saturated distrution factor representing 100% for block probes.
constexpr static uint64_t PseudoProbeFullDistributionFactor =
std::numeric_limits<uint64_t>::max();
struct PseudoProbeDwarfDiscriminator {
public:
// The following APIs encodes/decodes per-probe information to/from a
// 32-bit integer which is organized as:
// [2:0] - 0x7, this is reserved for regular discriminator,
// see DWARF discriminator encoding rule
// [18:3] - probe id
// [25:19] - probe distribution factor
// [28:26] - probe type, see PseudoProbeType
// [31:29] - reserved for probe attributes
static uint32_t packProbeData(uint32_t Index, uint32_t Type, uint32_t Flags,
uint32_t Factor) {
assert(Index <= 0xFFFF && "Probe index too big to encode, exceeding 2^16");
assert(Type <= 0x7 && "Probe type too big to encode, exceeding 7");
assert(Flags <= 0x7);
assert(Factor <= 100 &&
"Probe distribution factor too big to encode, exceeding 100");
return (Index << 3) | (Factor << 19) | (Type << 26) | 0x7;
}
static uint32_t extractProbeIndex(uint32_t Value) {
return (Value >> 3) & 0xFFFF;
}
static uint32_t extractProbeType(uint32_t Value) {
return (Value >> 26) & 0x7;
}
static uint32_t extractProbeAttributes(uint32_t Value) {
return (Value >> 29) & 0x7;
}
static uint32_t extractProbeFactor(uint32_t Value) {
return (Value >> 19) & 0x7F;
}
// The saturated distrution factor representing 100% for callsites.
constexpr static uint8_t FullDistributionFactor = 100;
};
struct PseudoProbe {
uint32_t Id;
uint32_t Type;
uint32_t Attr;
float Factor;
};
Optional<PseudoProbe> extractProbe(const Instruction &Inst);
void setProbeDistributionFactor(Instruction &Inst, float Factor);
} // end namespace llvm
#endif // LLVM_IR_PSEUDOPROBE_H
#ifdef __GNUC__
#pragma GCC diagnostic pop
#endif
|
