1//===---------- LazyReexports.cpp - Utilities for lazy reexports ----------===//
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#include "llvm/ExecutionEngine/Orc/LazyReexports.h"
10
11#include "llvm/ExecutionEngine/Orc/OrcABISupport.h"
12#include "llvm/TargetParser/Triple.h"
13
14#define DEBUG_TYPE "orc"
15
16namespace llvm {
17namespace orc {
18
19LazyCallThroughManager::LazyCallThroughManager(ExecutionSession &ES,
20 ExecutorAddr ErrorHandlerAddr,
21 TrampolinePool *TP)
22 : ES(ES), ErrorHandlerAddr(ErrorHandlerAddr), TP(TP) {}
23
24Expected<ExecutorAddr> LazyCallThroughManager::getCallThroughTrampoline(
25 JITDylib &SourceJD, SymbolStringPtr SymbolName,
26 NotifyResolvedFunction NotifyResolved) {
27 assert(TP && "TrampolinePool not set");
28
29 std::lock_guard<std::mutex> Lock(LCTMMutex);
30 auto Trampoline = TP->getTrampoline();
31
32 if (!Trampoline)
33 return Trampoline.takeError();
34
35 Reexports[*Trampoline] = ReexportsEntry{.SourceJD: &SourceJD, .SymbolName: std::move(SymbolName)};
36 Notifiers[*Trampoline] = std::move(NotifyResolved);
37 return *Trampoline;
38}
39
40ExecutorAddr LazyCallThroughManager::reportCallThroughError(Error Err) {
41 ES.reportError(Err: std::move(Err));
42 return ErrorHandlerAddr;
43}
44
45Expected<LazyCallThroughManager::ReexportsEntry>
46LazyCallThroughManager::findReexport(ExecutorAddr TrampolineAddr) {
47 std::lock_guard<std::mutex> Lock(LCTMMutex);
48 auto I = Reexports.find(x: TrampolineAddr);
49 if (I == Reexports.end())
50 return createStringError(EC: inconvertibleErrorCode(),
51 S: "Missing reexport for trampoline address %p" +
52 formatv(Fmt: "{0:x}", Vals&: TrampolineAddr));
53 return I->second;
54}
55
56Error LazyCallThroughManager::notifyResolved(ExecutorAddr TrampolineAddr,
57 ExecutorAddr ResolvedAddr) {
58 NotifyResolvedFunction NotifyResolved;
59 {
60 std::lock_guard<std::mutex> Lock(LCTMMutex);
61 auto I = Notifiers.find(x: TrampolineAddr);
62 if (I != Notifiers.end()) {
63 NotifyResolved = std::move(I->second);
64 Notifiers.erase(position: I);
65 }
66 }
67
68 return NotifyResolved ? NotifyResolved(ResolvedAddr) : Error::success();
69}
70
71void LazyCallThroughManager::resolveTrampolineLandingAddress(
72 ExecutorAddr TrampolineAddr,
73 NotifyLandingResolvedFunction NotifyLandingResolved) {
74
75 auto Entry = findReexport(TrampolineAddr);
76 if (!Entry)
77 return NotifyLandingResolved(reportCallThroughError(Err: Entry.takeError()));
78
79 // Declaring SLS and the callback outside of the call to ES.lookup is a
80 // workaround to fix build failures on AIX and on z/OS platforms.
81 SymbolLookupSet SLS({Entry->SymbolName});
82 auto Callback = [this, TrampolineAddr, SymbolName = Entry->SymbolName,
83 NotifyLandingResolved = std::move(NotifyLandingResolved)](
84 Expected<SymbolMap> Result) mutable {
85 if (Result) {
86 assert(Result->size() == 1 && "Unexpected result size");
87 assert(Result->count(SymbolName) && "Unexpected result value");
88 ExecutorAddr LandingAddr = (*Result)[SymbolName].getAddress();
89
90 if (auto Err = notifyResolved(TrampolineAddr, ResolvedAddr: LandingAddr))
91 NotifyLandingResolved(reportCallThroughError(Err: std::move(Err)));
92 else
93 NotifyLandingResolved(LandingAddr);
94 } else {
95 NotifyLandingResolved(reportCallThroughError(Err: Result.takeError()));
96 }
97 };
98
99 ES.lookup(K: LookupKind::Static,
100 SearchOrder: makeJITDylibSearchOrder(JDs: Entry->SourceJD,
101 Flags: JITDylibLookupFlags::MatchAllSymbols),
102 Symbols: std::move(SLS), RequiredState: SymbolState::Ready, NotifyComplete: std::move(Callback),
103 RegisterDependencies: NoDependenciesToRegister);
104}
105
106Expected<std::unique_ptr<LazyCallThroughManager>>
107createLocalLazyCallThroughManager(const Triple &T, ExecutionSession &ES,
108 ExecutorAddr ErrorHandlerAddr) {
109 switch (T.getArch()) {
110 default:
111 return make_error<StringError>(
112 Args: std::string("No callback manager available for ") + T.str(),
113 Args: inconvertibleErrorCode());
114
115 case Triple::aarch64:
116 case Triple::aarch64_32:
117 return LocalLazyCallThroughManager::Create<OrcAArch64>(ES,
118 ErrorHandlerAddr);
119
120 case Triple::x86:
121 return LocalLazyCallThroughManager::Create<OrcI386>(ES, ErrorHandlerAddr);
122
123 case Triple::loongarch64:
124 return LocalLazyCallThroughManager::Create<OrcLoongArch64>(
125 ES, ErrorHandlerAddr);
126
127 case Triple::mips:
128 return LocalLazyCallThroughManager::Create<OrcMips32Be>(ES,
129 ErrorHandlerAddr);
130
131 case Triple::mipsel:
132 return LocalLazyCallThroughManager::Create<OrcMips32Le>(ES,
133 ErrorHandlerAddr);
134
135 case Triple::mips64:
136 case Triple::mips64el:
137 return LocalLazyCallThroughManager::Create<OrcMips64>(ES, ErrorHandlerAddr);
138
139 case Triple::riscv64:
140 return LocalLazyCallThroughManager::Create<OrcRiscv64>(ES,
141 ErrorHandlerAddr);
142
143 case Triple::x86_64:
144 if (T.getOS() == Triple::OSType::Win32)
145 return LocalLazyCallThroughManager::Create<OrcX86_64_Win32>(
146 ES, ErrorHandlerAddr);
147 else
148 return LocalLazyCallThroughManager::Create<OrcX86_64_SysV>(
149 ES, ErrorHandlerAddr);
150 }
151}
152
153LazyReexportsMaterializationUnit::LazyReexportsMaterializationUnit(
154 LazyCallThroughManager &LCTManager, IndirectStubsManager &ISManager,
155 JITDylib &SourceJD, SymbolAliasMap CallableAliases, ImplSymbolMap *SrcJDLoc)
156 : MaterializationUnit(extractFlags(Aliases: CallableAliases)),
157 LCTManager(LCTManager), ISManager(ISManager), SourceJD(SourceJD),
158 CallableAliases(std::move(CallableAliases)), AliaseeTable(SrcJDLoc) {}
159
160StringRef LazyReexportsMaterializationUnit::getName() const {
161 return "<Lazy Reexports>";
162}
163
164void LazyReexportsMaterializationUnit::materialize(
165 std::unique_ptr<MaterializationResponsibility> R) {
166 auto RequestedSymbols = R->getRequestedSymbols();
167
168 SymbolAliasMap RequestedAliases;
169 for (auto &RequestedSymbol : RequestedSymbols) {
170 auto I = CallableAliases.find(Val: RequestedSymbol);
171 assert(I != CallableAliases.end() && "Symbol not found in alias map?");
172 RequestedAliases[I->first] = std::move(I->second);
173 CallableAliases.erase(I);
174 }
175
176 if (!CallableAliases.empty())
177 if (auto Err = R->replace(MU: lazyReexports(LCTManager, ISManager, SourceJD,
178 CallableAliases: std::move(CallableAliases),
179 SrcJDLoc: AliaseeTable))) {
180 R->getExecutionSession().reportError(Err: std::move(Err));
181 R->failMaterialization();
182 return;
183 }
184
185 IndirectStubsManager::StubInitsMap StubInits;
186 for (auto &Alias : RequestedAliases) {
187
188 auto CallThroughTrampoline = LCTManager.getCallThroughTrampoline(
189 SourceJD, SymbolName: Alias.second.Aliasee,
190 NotifyResolved: [&ISManager = this->ISManager,
191 StubSym = Alias.first](ExecutorAddr ResolvedAddr) -> Error {
192 return ISManager.updatePointer(Name: *StubSym, NewAddr: ResolvedAddr);
193 });
194
195 if (!CallThroughTrampoline) {
196 SourceJD.getExecutionSession().reportError(
197 Err: CallThroughTrampoline.takeError());
198 R->failMaterialization();
199 return;
200 }
201
202 StubInits[*Alias.first] =
203 std::make_pair(x&: *CallThroughTrampoline, y&: Alias.second.AliasFlags);
204 }
205
206 if (AliaseeTable != nullptr && !RequestedAliases.empty())
207 AliaseeTable->trackImpls(ImplMaps: RequestedAliases, SrcJD: &SourceJD);
208
209 if (auto Err = ISManager.createStubs(StubInits)) {
210 SourceJD.getExecutionSession().reportError(Err: std::move(Err));
211 R->failMaterialization();
212 return;
213 }
214
215 SymbolMap Stubs;
216 for (auto &Alias : RequestedAliases)
217 Stubs[Alias.first] = ISManager.findStub(Name: *Alias.first, ExportedStubsOnly: false);
218
219 // No registered dependencies, so these calls cannot fail.
220 cantFail(Err: R->notifyResolved(Symbols: Stubs));
221 cantFail(Err: R->notifyEmitted(EmittedDeps: {}));
222}
223
224void LazyReexportsMaterializationUnit::discard(const JITDylib &JD,
225 const SymbolStringPtr &Name) {
226 assert(CallableAliases.count(Name) &&
227 "Symbol not covered by this MaterializationUnit");
228 CallableAliases.erase(Val: Name);
229}
230
231MaterializationUnit::Interface
232LazyReexportsMaterializationUnit::extractFlags(const SymbolAliasMap &Aliases) {
233 SymbolFlagsMap SymbolFlags;
234 for (auto &KV : Aliases) {
235 assert(KV.second.AliasFlags.isCallable() &&
236 "Lazy re-exports must be callable symbols");
237 SymbolFlags[KV.first] = KV.second.AliasFlags;
238 }
239 return MaterializationUnit::Interface(std::move(SymbolFlags), nullptr);
240}
241
242} // End namespace orc.
243} // End namespace llvm.
244

source code of llvm/lib/ExecutionEngine/Orc/LazyReexports.cpp