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Merge pull request #499 from dbabokin/debug

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Fix for #462: broken debug infor support with LLVM 3.3+
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jbrodman
2013-05-21 08:00:14 -07:00
parent 333b89fa07 23ba61e76f
commit e661ee95ff
1 changed files with 23 additions and 0 deletions
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23
module.cpp
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@@ -195,6 +195,14 @@ lStripUnusedDebugInfo(llvm::Module *module) {
// debugging metadata organization on the LLVM side changed,
// here is a bunch of asserting to make sure that element 12 of
// the compile unit's MDNode has the subprograms array....
//
// Update: This is not an approved way of working with debug info
// metadata. It's not supposed to be deleted. But in out use-case
// it's quite useful thing, as we link in bunch of unnecessary
// stuff and remove it later on. Removing it is useful, as it
// reduces size of the binary significantly (manyfold for small
// programs).
#if defined(LLVM_3_1) || defined(LLVM_3_2)
llvm::MDNode *nodeSPMD =
llvm::dyn_cast<llvm::MDNode>(cuNode->getOperand(12));
Assert(nodeSPMD != NULL);
@@ -212,6 +220,21 @@ lStripUnusedDebugInfo(llvm::Module *module) {
llvm::MDNode *replNode =
llvm::MDNode::get(*g->ctx, llvm::ArrayRef<llvm::Value *>(usedSubprogramsArray));
cuNode->replaceOperandWith(12, replNode);
#else // LLVM 3.3+
llvm::MDNode *nodeSPMDArray =
llvm::dyn_cast<llvm::MDNode>(cuNode->getOperand(9));
Assert(nodeSPMDArray != NULL);
llvm::DIArray nodeSPs(nodeSPMDArray);
Assert(nodeSPs.getNumElements() == subprograms.getNumElements());
for (int i = 0; i < (int)nodeSPs.getNumElements(); ++i)
Assert(nodeSPs.getElement(i) == subprograms.getElement(i));
// And now we can go and stuff it into the node with some
// confidence...
llvm::MDNode *replNode =
m->diBuilder->getOrCreateArray(llvm::ArrayRef<llvm::Value *>(usedSubprograms));
cuNode->replaceOperandWith(9, replNode);
#endif
}
}