[ORC] Force linking of eh-frame registration functions from LLJIT.cpp.

Since aedeb8d5570, which switched to EPC-based eh-frame registrationin LLJIT,
the eh-frame registration functions need to be forcibly linked into the target
process.

Failure to link the eh-frame registration functions triggered a test failure in
https://green.lab.llvm.org/green/job/clang-stage1-RA/31497, which was fixed by
forcibly linking the registration functions into that test case in saf2b2214b4
(rdar://101083784), however it has also caused some tests (e.g. the C API unit
tests) that depend on successful construction of an LLJIT instance to be
skipped.

Moving the forcible registration into LLJIT.cpp fixes the general issue.

diff --git a/llvm/examples/OrcV2Examples/LLJITWithThinLTOSummaries/LLJITWithThinLTOSummaries.cpp b/llvm/examples/OrcV2Examples/LLJITWithThinLTOSummaries/LLJITWithThinLTOSummaries.cpp
index 32c49f6..a7cb4fc 100644 (file)
--- a/llvm/examples/OrcV2Examples/LLJITWithThinLTOSummaries/LLJITWithThinLTOSummaries.cpp
+++ b/llvm/examples/OrcV2Examples/LLJITWithThinLTOSummaries/LLJITWithThinLTOSummaries.cpp
@@ -37,7 +37,6 @@
 #include "llvm/ExecutionEngine/Orc/LLJIT.h"
 #include "llvm/ExecutionEngine/Orc/ThreadSafeModule.h"
 #include "llvm/ExecutionEngine/Orc/TargetProcess/TargetExecutionUtils.h"
-#include "llvm/ExecutionEngine/Orc/TargetProcess/RegisterEHFrames.h"
 #include "llvm/IR/GlobalValue.h"
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/ModuleSummaryIndex.h"
@@ -173,12 +172,6 @@ Expected<ThreadSafeModule> loadModule(StringRef Path,
   return ThreadSafeModule(std::move(*M), std::move(TSCtx));
 }
 
-// Make sure the eh-frame registration functions get linked into the binary.
-LLVM_ATTRIBUTE_USED void linkComponents() {
-  errs() << (void *)&llvm_orc_registerEHFrameSectionWrapper
-         << (void *)&llvm_orc_deregisterEHFrameSectionWrapper;
-}
-
 int main(int Argc, char *Argv[]) {
   InitLLVM X(Argc, Argv);
 

diff --git a/llvm/lib/ExecutionEngine/Orc/LLJIT.cpp b/llvm/lib/ExecutionEngine/Orc/LLJIT.cpp
index 342651d..b41cdd3 100644 (file)
--- a/llvm/lib/ExecutionEngine/Orc/LLJIT.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/LLJIT.cpp
@@ -16,6 +16,7 @@
 #include "llvm/ExecutionEngine/Orc/ObjectTransformLayer.h"
 #include "llvm/ExecutionEngine/Orc/RTDyldObjectLinkingLayer.h"
 #include "llvm/ExecutionEngine/Orc/Shared/OrcError.h"
+#include "llvm/ExecutionEngine/Orc/TargetProcess/RegisterEHFrames.h"
 #include "llvm/ExecutionEngine/SectionMemoryManager.h"
 #include "llvm/IR/GlobalVariable.h"
 #include "llvm/IR/IRBuilder.h"
@@ -1014,5 +1015,12 @@ LLLazyJIT::LLLazyJIT(LLLazyJITBuilderState &S, Error &Err) : LLJIT(S, Err) {
     CODLayer->setCloneToNewContextOnEmit(true);
 }
 
+// In-process LLJIT uses eh-frame section wrappers via EPC, so we need to force
+// them to be linked in.
+LLVM_ATTRIBUTE_USED void linkComponents() {
+  errs() << (void *)&llvm_orc_registerEHFrameSectionWrapper
+         << (void *)&llvm_orc_deregisterEHFrameSectionWrapper;
+}
+
 } // End namespace orc.
 } // End namespace llvm.