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
170
171
172
173
174
175
176
177
178
|
//===-- OProfileJITEventListener.cpp - Tell OProfile about JITted code ----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines a JITEventListener object that calls into OProfile to tell
// it about JITted functions. For now, we only record function names and sizes,
// but eventually we'll also record line number information.
//
// See http://oprofile.sourceforge.net/doc/devel/jit-interface.html for the
// definition of the interface we're using.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "oprofile-jit-event-listener"
#include "llvm/Function.h"
#include "llvm/Analysis/DebugInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/ExecutionEngine/JITEventListener.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/System/Errno.h"
#include "llvm/Config/config.h"
#include <stddef.h>
using namespace llvm;
#if USE_OPROFILE
#include <opagent.h>
namespace {
class OProfileJITEventListener : public JITEventListener {
op_agent_t Agent;
public:
OProfileJITEventListener();
~OProfileJITEventListener();
virtual void NotifyFunctionEmitted(const Function &F,
void *FnStart, size_t FnSize,
const EmittedFunctionDetails &Details);
virtual void NotifyFreeingMachineCode(const Function &F, void *OldPtr);
};
OProfileJITEventListener::OProfileJITEventListener()
: Agent(op_open_agent()) {
if (Agent == NULL) {
const std::string err_str = sys::StrError();
DEBUG(errs() << "Failed to connect to OProfile agent: " << err_str << "\n");
} else {
DEBUG(errs() << "Connected to OProfile agent.\n");
}
}
OProfileJITEventListener::~OProfileJITEventListener() {
if (Agent != NULL) {
if (op_close_agent(Agent) == -1) {
const std::string err_str = sys::StrError();
DEBUG(errs() << "Failed to disconnect from OProfile agent: "
<< err_str << "\n");
} else {
DEBUG(errs() << "Disconnected from OProfile agent.\n");
}
}
}
class FilenameCache {
// Holds the filename of each CompileUnit, so that we can pass the
// pointer into oprofile. These char*s are freed in the destructor.
DenseMap<MDNode*, char*> Filenames;
public:
const char *getFilename(MDNode *CompileUnit) {
char *&Filename = Filenames[CompileUnit];
if (Filename == NULL) {
DICompileUnit CU(CompileUnit);
Filename = strdup(CU.getFilename());
}
return Filename;
}
~FilenameCache() {
for (DenseMap<MDNode*, char*>::iterator
I = Filenames.begin(), E = Filenames.end(); I != E; ++I) {
free(I->second);
}
}
};
static debug_line_info LineStartToOProfileFormat(
const MachineFunction &MF, FilenameCache &Filenames,
uintptr_t Address, DebugLoc Loc) {
debug_line_info Result;
Result.vma = Address;
const DebugLocTuple &tuple = MF.getDebugLocTuple(Loc);
Result.lineno = tuple.Line;
Result.filename = Filenames.getFilename(tuple.CompileUnit);
DEBUG(errs() << "Mapping " << reinterpret_cast<void*>(Result.vma) << " to "
<< Result.filename << ":" << Result.lineno << "\n");
return Result;
}
// Adds the just-emitted function to the symbol table.
void OProfileJITEventListener::NotifyFunctionEmitted(
const Function &F, void *FnStart, size_t FnSize,
const EmittedFunctionDetails &Details) {
assert(F.hasName() && FnStart != 0 && "Bad symbol to add");
if (op_write_native_code(Agent, F.getName().data(),
reinterpret_cast<uint64_t>(FnStart),
FnStart, FnSize) == -1) {
DEBUG(errs() << "Failed to tell OProfile about native function "
<< F.getName() << " at ["
<< FnStart << "-" << ((char*)FnStart + FnSize) << "]\n");
return;
}
// Now we convert the line number information from the address/DebugLoc format
// in Details to the address/filename/lineno format that OProfile expects.
// OProfile 0.9.4 (and maybe later versions) has a bug that causes it to
// ignore line numbers for addresses above 4G.
FilenameCache Filenames;
std::vector<debug_line_info> LineInfo;
LineInfo.reserve(1 + Details.LineStarts.size());
if (!Details.MF->getDefaultDebugLoc().isUnknown()) {
LineInfo.push_back(LineStartToOProfileFormat(
*Details.MF, Filenames,
reinterpret_cast<uintptr_t>(FnStart),
Details.MF->getDefaultDebugLoc()));
}
for (std::vector<EmittedFunctionDetails::LineStart>::const_iterator
I = Details.LineStarts.begin(), E = Details.LineStarts.end();
I != E; ++I) {
LineInfo.push_back(LineStartToOProfileFormat(
*Details.MF, Filenames, I->Address, I->Loc));
}
if (!LineInfo.empty()) {
if (op_write_debug_line_info(Agent, FnStart,
LineInfo.size(), &*LineInfo.begin()) == -1) {
DEBUG(errs()
<< "Failed to tell OProfile about line numbers for native function "
<< F.getName() << " at ["
<< FnStart << "-" << ((char*)FnStart + FnSize) << "]\n");
}
}
}
// Removes the to-be-deleted function from the symbol table.
void OProfileJITEventListener::NotifyFreeingMachineCode(
const Function &F, void *FnStart) {
assert(FnStart && "Invalid function pointer");
if (op_unload_native_code(Agent, reinterpret_cast<uint64_t>(FnStart)) == -1) {
DEBUG(errs() << "Failed to tell OProfile about unload of native function "
<< F.getName() << " at " << FnStart << "\n");
}
}
} // anonymous namespace.
namespace llvm {
JITEventListener *createOProfileJITEventListener() {
return new OProfileJITEventListener;
}
}
#else // USE_OPROFILE
namespace llvm {
// By defining this to return NULL, we can let clients call it unconditionally,
// even if they haven't configured with the OProfile libraries.
JITEventListener *createOProfileJITEventListener() {
return NULL;
}
} // namespace llvm
#endif // USE_OPROFILE
|
