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If llvm.dbg.region.end is disappearing then remove corresponding llvm.dbg.func.start also.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64278 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -15,6 +15,7 @@
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#include "llvm/Transforms/Utils/BasicBlockUtils.h"
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#include "llvm/Function.h"
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#include "llvm/Instructions.h"
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#include "llvm/IntrinsicInst.h"
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#include "llvm/Constant.h"
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#include "llvm/Type.h"
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#include "llvm/Analysis/AliasAnalysis.h"
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@ -31,7 +32,7 @@ void llvm::DeleteDeadBlock(BasicBlock *BB) {
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// Can delete self loop.
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BB->getSinglePredecessor() == BB) && "Block is not dead!");
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TerminatorInst *BBTerm = BB->getTerminator();
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Value *DbgRegionEndContext = NULL;
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// Loop through all of our successors and make sure they know that one
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// of their predecessors is going away.
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for (unsigned i = 0, e = BBTerm->getNumSuccessors(); i != e; ++i)
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@ -40,6 +41,10 @@ void llvm::DeleteDeadBlock(BasicBlock *BB) {
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// Zap all the instructions in the block.
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while (!BB->empty()) {
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Instruction &I = BB->back();
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// It is possible to have multiple llvm.dbg.region.end in a block.
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if (DbgRegionEndInst *DREI = dyn_cast<DbgRegionEndInst>(&I))
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DbgRegionEndContext = DREI->getContext();
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// If this instruction is used, replace uses with an arbitrary value.
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// Because control flow can't get here, we don't care what we replace the
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// value with. Note that since this block is unreachable, and all values
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@ -49,7 +54,22 @@ void llvm::DeleteDeadBlock(BasicBlock *BB) {
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I.replaceAllUsesWith(UndefValue::get(I.getType()));
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BB->getInstList().pop_back();
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}
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if (DbgRegionEndContext) {
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// Delete corresponding llvm.dbg.func.start from entry block.
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BasicBlock &Entry = BB->getParent()->getEntryBlock();
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DbgFuncStartInst *DbgFuncStart = NULL;
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for (BasicBlock::iterator BI = Entry.begin(), BE = Entry.end();
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BI != BE; ++BI) {
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if (DbgFuncStartInst *DFSI = dyn_cast<DbgFuncStartInst>(BI)) {
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DbgFuncStart = DFSI;
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break;
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}
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}
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if (DbgFuncStart && DbgFuncStart->getSubprogram() == DbgRegionEndContext)
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DbgFuncStart->eraseFromParent();
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}
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// Zap the block!
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BB->eraseFromParent();
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}
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@ -1806,7 +1806,7 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
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// If we eliminated all predecessors of the block, delete the block now.
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if (pred_begin(BB) == pred_end(BB))
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// We know there are no successors, so just nuke the block.
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M->getBasicBlockList().erase(BB);
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DeleteDeadBlock(BB);
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return true;
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}
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@ -1,4 +1,5 @@
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; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | grep region | count 1
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; RUN: llvm-as < %s | opt -simplifycfg | llvm-dis | grep func.start | count 1
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%llvm.dbg.anchor.type = type { i32, i32 }
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%llvm.dbg.basictype.type = type { i32, { }*, i8*, { }*, i32, i64, i64, i64, i32, i32 }
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%llvm.dbg.compile_unit.type = type { i32, { }*, i32, i8*, i8*, i8*, i1, i1, i8* }
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