llvm/lib/CodeGen/CMakeLists.txt

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CMake
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add_llvm_library(LLVMCodeGen
Analysis.cpp
AggressiveAntiDepBreaker.cpp
BranchFolding.cpp
CalcSpillWeights.cpp
CodePlacementOpt.cpp
CriticalAntiDepBreaker.cpp
DeadMachineInstructionElim.cpp
Add a new codegen pass that normalizes dwarf exception handling code in preparation for code generation. The main thing it does is handle the case when eh.exception calls (and, in a future patch, eh.selector calls) are far away from landing pads. Right now in practice you only find eh.exception calls close to landing pads: either in a landing pad (the common case) or in a landing pad successor, due to loop passes shifting them about. However future exception handling improvements will result in calls far from landing pads: (1) Inlining of rewinds. Consider the following case: In function @f: ... invoke @g to label %normal unwind label %unwinds ... unwinds: %ex = call i8* @llvm.eh.exception() ... In function @g: ... invoke @something to label %continue unwind label %handler ... handler: %ex = call i8* @llvm.eh.exception() ... perform cleanups ... "rethrow exception" Now inline @g into @f. Currently this is turned into: In function @f: ... invoke @something to label %continue unwind label %handler ... handler: %ex = call i8* @llvm.eh.exception() ... perform cleanups ... invoke "rethrow exception" to label %normal unwind label %unwinds unwinds: %ex = call i8* @llvm.eh.exception() ... However we would like to simplify invoke of "rethrow exception" into a branch to the %unwinds label. Then %unwinds is no longer a landing pad, and the eh.exception call there is then far away from any landing pads. (2) Using the unwind instruction for cleanups. It would be nice to have codegen handle the following case: invoke @something to label %continue unwind label %run_cleanups ... handler: ... perform cleanups ... unwind This requires turning "unwind" into a library call, which necessarily takes a pointer to the exception as an argument (this patch also does this unwind lowering). But that means you are using eh.exception again far from a landing pad. (3) Bugpoint simplifications. When bugpoint is simplifying exception handling code it often generates eh.exception calls far from a landing pad, which then causes codegen to assert. Bugpoint then latches on to this assertion and loses sight of the original problem. Note that it is currently rare for this pass to actually do anything. And in fact it normally shouldn't do anything at all given the code coming out of llvm-gcc! But it does fire a few times in the testsuite. As far as I can see this is almost always due to the LoopStrengthReduce codegen pass introducing pointless loop preheader blocks which are landing pads and only contain a branch to another block. This other block contains an eh.exception call. So probably by tweaking LoopStrengthReduce a bit this can be avoided. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@72276 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-22 20:36:31 +00:00
DwarfEHPrepare.cpp
ELFCodeEmitter.cpp
ELFWriter.cpp
ExactHazardRecognizer.cpp
GCMetadata.cpp
GCMetadataPrinter.cpp
GCStrategy.cpp
IfConversion.cpp
IntrinsicLowering.cpp
LLVMTargetMachine.cpp
LatencyPriorityQueue.cpp
LiveInterval.cpp
LiveIntervalAnalysis.cpp
LiveStackAnalysis.cpp
LiveVariables.cpp
LowerSubregs.cpp
MachineBasicBlock.cpp
MachineCSE.cpp
MachineDominators.cpp
MachineFunction.cpp
MachineFunctionAnalysis.cpp
MachineFunctionPass.cpp
MachineFunctionPrinterPass.cpp
MachineInstr.cpp
MachineLICM.cpp
MachineLoopInfo.cpp
MachineModuleInfo.cpp
MachineModuleInfoImpls.cpp
MachinePassRegistry.cpp
MachineRegisterInfo.cpp
MachineSSAUpdater.cpp
MachineSink.cpp
MachineVerifier.cpp
ObjectCodeEmitter.cpp
OcamlGC.cpp
OptimizeExts.cpp
OptimizePHIs.cpp
PHIElimination.cpp
Passes.cpp
PostRASchedulerList.cpp
PreAllocSplitting.cpp
ProcessImplicitDefs.cpp
PrologEpilogInserter.cpp
PseudoSourceValue.cpp
RegAllocLinearScan.cpp
RegAllocLocal.cpp
RegAllocPBQP.cpp
RegisterCoalescer.cpp
RegisterScavenging.cpp
ScheduleDAG.cpp
ScheduleDAGEmit.cpp
ScheduleDAGInstrs.cpp
ScheduleDAGPrinter.cpp
ShadowStackGC.cpp
ShrinkWrapping.cpp
SimpleRegisterCoalescing.cpp
SjLjEHPrepare.cpp
SlotIndexes.cpp
Spiller.cpp
StackProtector.cpp
StackSlotColoring.cpp
StrongPHIElimination.cpp
TailDuplication.cpp
TargetInstrInfoImpl.cpp
TargetLoweringObjectFileImpl.cpp
TwoAddressInstructionPass.cpp
UnreachableBlockElim.cpp
VirtRegMap.cpp
VirtRegRewriter.cpp
)
target_link_libraries (LLVMCodeGen LLVMCore LLVMScalarOpts)