class FunctionPass;
class MachineFunctionPass;
class PassInfo;
+ class PassManagerBase;
class TargetLowering;
class TargetRegisterClass;
class raw_ostream;
namespace llvm {
+class PassConfigImpl;
+
/// Target-Independent Code Generator Pass Configuration Options.
///
/// This is an ImmutablePass solely for the purpose of exposing CodeGen options
/// to the internals of other CodeGen passes.
class TargetPassConfig : public ImmutablePass {
+public:
+ /// Pseudo Pass IDs. These are defined within TargetPassConfig because they
+ /// are unregistered pass IDs. They are only useful for use with
+ /// TargetPassConfig APIs to identify multiple occurrences of the same pass.
+ ///
+
+ /// EarlyTailDuplicate - A clone of the TailDuplicate pass that runs early
+ /// during codegen, on SSA form.
+ static char EarlyTailDuplicateID;
+
+ /// PostRAMachineLICM - A clone of the LICM pass that runs during late machine
+ /// optimization after regalloc.
+ static char PostRAMachineLICMID;
+
+private:
+ PassManagerBase *PM;
+ AnalysisID StartAfter;
+ AnalysisID StopAfter;
+ bool Started;
+ bool Stopped;
+
protected:
TargetMachine *TM;
- PassManagerBase ±
- bool Initialized; // Flagged after all passes are configured.
+ PassConfigImpl *Impl; // Internal data structures
+ bool Initialized; // Flagged after all passes are configured.
// Target Pass Options
// Targets provide a default setting, user flags override.
return TM->getTargetLowering();
}
+ //
void setInitialized() { Initialized = true; }
CodeGenOpt::Level getOptLevel() const { return TM->getOptLevel(); }
+ /// setStartStopPasses - Set the StartAfter and StopAfter passes to allow
+ /// running only a portion of the normal code-gen pass sequence. If the
+ /// Start pass ID is zero, then compilation will begin at the normal point;
+ /// otherwise, clear the Started flag to indicate that passes should not be
+ /// added until the starting pass is seen. If the Stop pass ID is zero,
+ /// then compilation will continue to the end.
+ void setStartStopPasses(AnalysisID Start, AnalysisID Stop) {
+ StartAfter = Start;
+ StopAfter = Stop;
+ Started = (StartAfter == 0);
+ }
+
void setDisableVerify(bool Disable) { setOpt(DisableVerify, Disable); }
bool getEnableTailMerge() const { return EnableTailMerge; }
void setEnableTailMerge(bool Enable) { setOpt(EnableTailMerge, Enable); }
+ /// Allow the target to override a specific pass without overriding the pass
+ /// pipeline. When passes are added to the standard pipeline at the
+ /// point where StandardID is expected, add TargetID in its place.
+ void substitutePass(AnalysisID StandardID, AnalysisID TargetID);
+
+ /// Insert InsertedPassID pass after TargetPassID pass.
+ void insertPass(AnalysisID TargetPassID, AnalysisID InsertedPassID);
+
+ /// Allow the target to enable a specific standard pass by default.
+ void enablePass(AnalysisID PassID) { substitutePass(PassID, PassID); }
+
+ /// Allow the target to disable a specific standard pass by default.
+ void disablePass(AnalysisID PassID) { substitutePass(PassID, 0); }
+
+ /// Return the pass substituted for StandardID by the target.
+ /// If no substitution exists, return StandardID.
+ AnalysisID getPassSubstitution(AnalysisID StandardID) const;
+
+ /// Return true if the optimized regalloc pipeline is enabled.
bool getOptimizeRegAlloc() const;
/// Add common target configurable passes that perform LLVM IR to IR
/// transforms following machine independent optimization.
virtual void addIRPasses();
+ /// Add passes to lower exception handling for the code generator.
+ void addPassesToHandleExceptions();
+
+ /// Add pass to prepare the LLVM IR for code generation. This should be done
+ /// before exception handling preparation passes.
+ virtual void addCodeGenPrepare();
+
/// Add common passes that perform LLVM IR to IR transforms in preparation for
/// instruction selection.
virtual void addISelPrepare();
/// LLVMTargetMachine provides standard regalloc passes for most targets.
virtual void addOptimizedRegAlloc(FunctionPass *RegAllocPass);
- /// addPostRegAlloc - This method may be implemented by targets that want
- /// to run passes after register allocation but before prolog-epilog
- /// insertion. This should return true if -print-machineinstrs should print
- /// after these passes.
+ /// addPreRewrite - Add passes to the optimized register allocation pipeline
+ /// after register allocation is complete, but before virtual registers are
+ /// rewritten to physical registers.
+ ///
+ /// These passes must preserve VirtRegMap and LiveIntervals, and when running
+ /// after RABasic or RAGreedy, they should take advantage of LiveRegMatrix.
+ /// When these passes run, VirtRegMap contains legal physreg assignments for
+ /// all virtual registers.
+ virtual bool addPreRewrite() {
+ return false;
+ }
+
+ /// addFinalizeRegAlloc - This method may be implemented by targets that want
+ /// to run passes within the regalloc pipeline, immediately after the register
+ /// allocation pass itself. These passes run as soon as virtual regisiters
+ /// have been rewritten to physical registers but before and other postRA
+ /// optimization happens. Targets that have marked instructions for bundling
+ /// must have finalized those bundles by the time these passes have run,
+ /// because subsequent passes are not guaranteed to be bundle-aware.
+ virtual bool addFinalizeRegAlloc() {
+ return false;
+ }
+
+ /// addPostRegAlloc - This method may be implemented by targets that want to
+ /// run passes after register allocation pass pipeline but before
+ /// prolog-epilog insertion. This should return true if -print-machineinstrs
+ /// should print after these passes.
virtual bool addPostRegAlloc() {
return false;
}
/// Utilities for targets to add passes to the pass manager.
///
- /// Add a target-independent CodeGen pass at this point in the pipeline.
- void addPass(char &ID);
+ /// Add a CodeGen pass at this point in the pipeline after checking overrides.
+ /// Return the pass that was added, or zero if no pass was added.
+ AnalysisID addPass(AnalysisID PassID);
+
+ /// Add a pass to the PassManager if that pass is supposed to be run, as
+ /// determined by the StartAfter and StopAfter options.
+ void addPass(Pass *P);
/// addMachinePasses helper to create the target-selected or overriden
/// regalloc pass.
FunctionPass *createRegAllocPass(bool Optimized);
- /// printNoVerify - Add a pass to dump the machine function, if debugging is
- /// enabled.
- ///
- void printNoVerify(const char *Banner) const;
-
/// printAndVerify - Add a pass to dump then verify the machine function, if
/// those steps are enabled.
///
- void printAndVerify(const char *Banner) const;
+ void printAndVerify(const char *Banner);
};
} // namespace llvm
/// MachineLoopInfo - This pass is a loop analysis pass.
extern char &MachineLoopInfoID;
- /// MachineLoopRanges - This pass is an on-demand loop coverage analysis.
- extern char &MachineLoopRangesID;
-
/// MachineDominators - This pass is a machine dominators analysis pass.
extern char &MachineDominatorsID;
/// This pass is still in development
extern char &StrongPHIEliminationID;
+ /// LiveIntervals - This analysis keeps track of the live ranges of virtual
+ /// and physical registers.
+ extern char &LiveIntervalsID;
+
/// LiveStacks pass. An analysis keeping track of the liveness of stack slots.
extern char &LiveStacksID;
/// basic blocks.
extern char &SpillPlacementID;
+ /// VirtRegRewriter pass. Rewrite virtual registers to physical registers as
+ /// assigned in VirtRegMap.
+ extern char &VirtRegRewriterID;
+
/// UnreachableMachineBlockElimination - This pass removes unreachable
/// machine basic blocks.
extern char &UnreachableMachineBlockElimID;
/// branches.
extern char &BranchFolderPassID;
+ /// MachineFunctionPrinterPass - This pass prints out MachineInstr's.
+ extern char &MachineFunctionPrinterPassID;
+
/// TailDuplicate - Duplicate blocks with unconditional branches
/// into tails of their predecessors.
extern char &TailDuplicateID;
+ /// MachineTraceMetrics - This pass computes critical path and CPU resource
+ /// usage in an ensemble of traces.
+ extern char &MachineTraceMetricsID;
+
+ /// EarlyIfConverter - This pass performs if-conversion on SSA form by
+ /// inserting cmov instructions.
+ extern char &EarlyIfConverterID;
+
+ /// StackSlotColoring - This pass performs stack coloring and merging.
+ /// It merges disjoint allocas to reduce the stack size.
+ extern char &StackColoringID;
+
/// IfConverter - This pass performs machine code if conversion.
extern char &IfConverterID;
/// adapted to code generation. Required if using dwarf exception handling.
FunctionPass *createDwarfEHPass(const TargetMachine *tm);
- /// createSjLjEHPass - This pass adapts exception handling code to use
+ /// createSjLjEHPreparePass - This pass adapts exception handling code to use
/// the GCC-style builtin setjmp/longjmp (sjlj) to handling EH control flow.
///
- FunctionPass *createSjLjEHPass(const TargetLowering *tli);
+ FunctionPass *createSjLjEHPreparePass(const TargetLowering *tli);
/// LocalStackSlotAllocation - This pass assigns local frame indices to stack
/// slots relative to one another and allocates base registers to access them
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