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
|
//===------- UnwindInfoManager.cpp - Register unwind info sections --------===//
//
// 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
//
//===----------------------------------------------------------------------===//
#include "llvm/ExecutionEngine/Orc/TargetProcess/UnwindInfoManager.h"
#include "llvm/ExecutionEngine/Orc/Shared/OrcRTBridge.h"
#include "llvm/ExecutionEngine/Orc/Shared/WrapperFunctionUtils.h"
#ifdef __APPLE__
#include <dlfcn.h>
#endif // __APPLE__
#define DEBUG_TYPE "orc"
using namespace llvm;
using namespace llvm::orc;
using namespace llvm::orc::shared;
static orc::shared::CWrapperFunctionResult
llvm_orc_rt_alt_UnwindInfoManager_register(const char *Data, uint64_t Size) {
using SPSSig = SPSError(SPSSequence<SPSExecutorAddrRange>, SPSExecutorAddr,
SPSExecutorAddrRange, SPSExecutorAddrRange);
return WrapperFunction<SPSSig>::handle(
Data, Size,
[](std::vector<ExecutorAddrRange> CodeRanges, ExecutorAddr DSOBase,
ExecutorAddrRange DWARFRange,
ExecutorAddrRange CompactUnwindRange) {
return UnwindInfoManager::registerSections(
CodeRanges, DSOBase, DWARFRange, CompactUnwindRange);
})
.release();
}
static orc::shared::CWrapperFunctionResult
llvm_orc_rt_alt_UnwindInfoManager_deregister(const char *Data, uint64_t Size) {
using SPSSig = SPSError(SPSSequence<SPSExecutorAddrRange>);
return WrapperFunction<SPSSig>::handle(
Data, Size,
[](std::vector<ExecutorAddrRange> CodeRanges) {
return UnwindInfoManager::deregisterSections(CodeRanges);
})
.release();
}
namespace llvm::orc {
static const char *AddFnName = "__unw_add_find_dynamic_unwind_sections";
[[maybe_unused]] static const char *RemoveFnName = "__unw_remove_find_dynamic_unwind_sections";
static std::unique_ptr<UnwindInfoManager> Instance;
static int (*RemoveFindDynamicUnwindSections)(void *) = nullptr;
UnwindInfoManager::~UnwindInfoManager() {
if (int Err = RemoveFindDynamicUnwindSections((void *)&findSections)) {
LLVM_DEBUG({
dbgs() << "Failed call to " << RemoveFnName << ": error = " << Err
<< "\n";
});
}
}
bool UnwindInfoManager::TryEnable() {
#ifdef __APPLE__
static std::mutex M;
std::lock_guard<std::mutex> Lock(M);
if (Instance)
return true;
auto AddFn = (int (*)(void *))dlsym(RTLD_DEFAULT, AddFnName);
if (!AddFn)
return false;
auto RemoveFn = (int (*)(void *))dlsym(RTLD_DEFAULT, RemoveFnName);
if (!RemoveFn)
return false;
Instance.reset(new UnwindInfoManager());
if (auto Err = AddFn((void *)&findSections)) {
LLVM_DEBUG({
dbgs() << "Failed call to " << AddFnName << ": error = " << Err << "\n";
});
Instance = nullptr;
return false;
}
RemoveFindDynamicUnwindSections = RemoveFn;
return true;
#else
return false;
#endif // __APPLE__
}
void UnwindInfoManager::addBootstrapSymbols(StringMap<ExecutorAddr> &M) {
M[rt_alt::UnwindInfoManagerRegisterActionName] =
ExecutorAddr::fromPtr(llvm_orc_rt_alt_UnwindInfoManager_register);
M[rt_alt::UnwindInfoManagerDeregisterActionName] =
ExecutorAddr::fromPtr(llvm_orc_rt_alt_UnwindInfoManager_deregister);
}
Error UnwindInfoManager::registerSections(
ArrayRef<orc::ExecutorAddrRange> CodeRanges, orc::ExecutorAddr DSOBase,
orc::ExecutorAddrRange DWARFEHFrame, orc::ExecutorAddrRange CompactUnwind) {
return Instance->registerSectionsImpl(CodeRanges, DSOBase, DWARFEHFrame,
CompactUnwind);
}
Error UnwindInfoManager::deregisterSections(
ArrayRef<orc::ExecutorAddrRange> CodeRanges) {
return Instance->deregisterSectionsImpl(CodeRanges);
}
int UnwindInfoManager::findSectionsImpl(uintptr_t Addr, UnwindSections *Info) {
std::lock_guard<std::mutex> Lock(M);
auto I = UWSecs.upper_bound(Addr);
if (I == UWSecs.begin())
return 0;
--I;
*Info = I->second;
return 1;
}
int UnwindInfoManager::findSections(uintptr_t Addr, UnwindSections *Info) {
return Instance->findSectionsImpl(Addr, Info);
}
Error UnwindInfoManager::registerSectionsImpl(
ArrayRef<ExecutorAddrRange> CodeRanges, ExecutorAddr DSOBase,
ExecutorAddrRange DWARFEHFrame, ExecutorAddrRange CompactUnwind) {
std::lock_guard<std::mutex> Lock(M);
for (auto &R : CodeRanges)
UWSecs[R.Start.getValue()] =
UnwindSections{static_cast<uintptr_t>(DSOBase.getValue()),
static_cast<uintptr_t>(DWARFEHFrame.Start.getValue()),
static_cast<size_t>(DWARFEHFrame.size()),
static_cast<uintptr_t>(CompactUnwind.Start.getValue()),
static_cast<size_t>(CompactUnwind.size())};
return Error::success();
}
Error UnwindInfoManager::deregisterSectionsImpl(
ArrayRef<ExecutorAddrRange> CodeRanges) {
std::lock_guard<std::mutex> Lock(M);
for (auto &R : CodeRanges) {
auto I = UWSecs.find(R.Start.getValue());
if (I == UWSecs.end())
return make_error<StringError>(
"No unwind-info sections registered for range " +
formatv("{0:x} - {1:x}", R.Start, R.End),
inconvertibleErrorCode());
UWSecs.erase(I);
}
return Error::success();
}
} // namespace llvm::orc
|
