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Added TargetPassConfig::disablePass/substitutePass as a general mechanism to override specific passes.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@150562 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2012-02-15 03:21:47 +00:00
parent 5fd84a24e6
commit 5e108eeeef
5 changed files with 69 additions and 16 deletions
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48
lib/CodeGen/Passes.cpp
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@ -115,16 +115,34 @@ char TargetPassConfig::ID = 0;
static char NoPassIDAnchor = 0;
char &llvm::NoPassID = NoPassIDAnchor;
namespace llvm {
class PassConfigImpl {
public:
// List of passes explicitly substituted by this target. Normally this is
// empty, but it is a convenient way to suppress or replace specific passes
// that are part of a standard pass pipeline without overridding the entire
// pipeline. This mechanism allows target options to inherit a standard pass's
// user interface. For example, a target may disable a standard pass by
// default by substituting NoPass, and the user may still enable that standard
// pass with an explicit command line option.
DenseMap<AnalysisID,AnalysisID> TargetPasses;
};
} // namespace llvm
// Out of line virtual method.
TargetPassConfig::~TargetPassConfig() {}
TargetPassConfig::~TargetPassConfig() {
delete Impl;
}
// Out of line constructor provides default values for pass options and
// registers all common codegen passes.
TargetPassConfig::TargetPassConfig(TargetMachine *tm, PassManagerBase &pm)
: ImmutablePass(ID), TM(tm), PM(pm), Initialized(false),
: ImmutablePass(ID), TM(tm), PM(pm), Impl(0), Initialized(false),
DisableVerify(false),
EnableTailMerge(true) {
Impl = new PassConfigImpl();
// Register all target independent codegen passes to activate their PassIDs,
// including this pass itself.
initializeCodeGen(*PassRegistry::getPassRegistry());
@ -149,15 +167,33 @@ void TargetPassConfig::setOpt(bool &Opt, bool Val) {
Opt = Val;
}
void TargetPassConfig::addPass(char &ID) {
if (&ID == &NoPassID)
return;
void TargetPassConfig::substitutePass(char &StandardID, char &TargetID) {
Impl->TargetPasses[&StandardID] = &TargetID;
}
AnalysisID TargetPassConfig::getPassSubstitution(AnalysisID ID) const {
DenseMap<AnalysisID, AnalysisID>::const_iterator
I = Impl->TargetPasses.find(ID);
if (I == Impl->TargetPasses.end())
return ID;
return I->second;
}
/// Add a CodeGen pass at this point in the pipeline after checking for target
/// and command line overrides.
AnalysisID TargetPassConfig::addPass(char &ID) {
assert(!Initialized && "PassConfig is immutable");
AnalysisID FinalID = getPassSubstitution(&ID);
// FIXME: check user overrides
Pass *P = Pass::createPass(ID);
if (FinalID == &NoPassID)
return FinalID;
Pass *P = Pass::createPass(FinalID);
if (!P)
llvm_unreachable("Pass ID not registered");
PM.add(P);
return FinalID;
}
void TargetPassConfig::printNoVerify(const char *Banner) const {