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[RuntimeDyld] Skip relocations for external symbols with 64-bit address ~0ULL.

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Requested by Eugene Rozenfeld of the LLILC team, this feature allows JIT
clients to skip relocations for selected external symbols by returning ~0ULL
from their symbol resolver. If this value is returned for a given symbol,
RuntimeDyld will skip all relocations for that symbol. The client will be
responsible for applying the skipped relocations manually before the code
is executed.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@241383 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Lang Hames
2015-07-04 01:35:26 +00:00
parent 9a9ee6f550
commit b21c7647d8
4 changed files with 84 additions and 21 deletions
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16
lib/ExecutionEngine/RuntimeDyld/RuntimeDyld.cpp
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@@ -815,12 +815,16 @@ void RuntimeDyldImpl::resolveExternalSymbols() {
report_fatal_error("Program used external function '" + Name +
"' which could not be resolved!");
DEBUG(dbgs() << "Resolving relocations Name: " << Name << "\t"
<< format("0x%lx", Addr) << "\n");
// This list may have been updated when we called getSymbolAddress, so
// don't change this code to get the list earlier.
RelocationList &Relocs = i->second;
resolveRelocationList(Relocs, Addr);
// If Resolver returned UINT64_MAX, the client wants to handle this symbol
// manually and we shouldn't resolve its relocations.
if (Addr != UINT64_MAX) {
DEBUG(dbgs() << "Resolving relocations Name: " << Name << "\t"
<< format("0x%lx", Addr) << "\n");
// This list may have been updated when we called getSymbolAddress, so
// don't change this code to get the list earlier.
RelocationList &Relocs = i->second;
resolveRelocationList(Relocs, Addr);
}
}
ExternalSymbolRelocations.erase(i);

4
lib/ExecutionEngine/RuntimeDyld/RuntimeDyldChecker.cpp
View File

@@ -727,7 +727,9 @@ bool RuntimeDyldCheckerImpl::checkAllRulesInBuffer(StringRef RulePrefix,
}
bool RuntimeDyldCheckerImpl::isSymbolValid(StringRef Symbol) const {
return getRTDyld().getSymbolLocalAddress(Symbol) != nullptr;
if (getRTDyld().getSymbolLocalAddress(Symbol))
return true;
return !!getRTDyld().Resolver.findSymbol(Symbol);
}
uint64_t RuntimeDyldCheckerImpl::getSymbolLocalAddr(StringRef Symbol) const {