Sdc.hh

// OpenSTA, Static Timing Analyzer
// Copyright (c) 2019, Parallax Software, Inc.
// 
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// 
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
// 
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <https://www.gnu.org/licenses/>.

#ifndef STA_SDC_H
#define STA_SDC_H

#include <mutex>
#include "DisallowCopyAssign.hh"
#include "StringUtil.hh"
#include "StringSet.hh"
#include "Map.hh"
#include "HashSet.hh"
#include "UnorderedMap.hh"
#include "MinMax.hh"
#include "RiseFallValues.hh"
#include "StaState.hh"
#include "NetworkClass.hh"
#include "LibertyClass.hh"
#include "GraphClass.hh"
#include "SdcClass.hh"
#include "Clock.hh"
#include "DataCheck.hh"
#include "CycleAccting.hh"

namespace sta {

class OperatingConditions;
class PortExtCap;
class ClockGatingCheck;
class InputDriveCell;
class DisabledPorts;
class GraphLoop;
class DeratingFactors;
class DeratingFactorsGlobal;
class DeratingFactorsNet;
class DeratingFactorsCell;
class PatternMatch;
class FindNetCaps;
class ClkHpinDisable;
class FindClkHpinDisables;
class Corner;
class ClockGroupIterator;
class GroupPathIterator;
class ClockPinIterator;
class ClockIterator;

typedef std::pair<const Pin*, const Clock*> PinClockPair;

class ClockInsertionPinClkLess
{
public:
  bool operator()(const ClockInsertion *insert1,
		  const ClockInsertion *insert2) const;
};

class ClockLatencyPinClkLess
{
public:
  bool operator()(const ClockLatency *latency1,
		  const ClockLatency *latency2) const;
};

// This is symmetric with respect to the clocks
// in the pair so Pair(clk1, clk2) is the same
// as Pair(clk2, clk1).
class ClockPairLess
{
public:
  bool operator()(const ClockPair &pair1,
		  const ClockPair &pair2) const;
};

class PinClockPairLess
{
public:
  PinClockPairLess(const Network *network);
  bool operator()(const PinClockPair &pin_clk1,
		  const PinClockPair &pin_clk2) const;

protected:
  const Network *network_;
};

class ClkHpinDisableLess
{ 
public:
  bool operator()(const ClkHpinDisable *disable1,
		  const ClkHpinDisable *disable2) const;
};

typedef Map<const char*,Clock*, CharPtrLess> ClockNameMap;
typedef UnorderedMap<const Pin*, ClockSet*> ClockPinMap;
typedef Set<InputDelay*> InputDelaySet;
typedef Map<const Pin*,InputDelaySet*> InputDelaysPinMap;
typedef Set<OutputDelay*> OutputDelaySet;
typedef Map<const Pin*,OutputDelaySet*> OutputDelaysPinMap;
// Use HashSet so no read lock is required.
typedef HashSet<CycleAccting*, CycleAcctingHash, CycleAcctingEqual> CycleAcctingSet;
typedef Set<Instance*> InstanceSet;
typedef UnorderedMap<const Pin*,ExceptionPathSet*> PinExceptionsMap;
typedef Map<const Clock*,ExceptionPathSet*> ClockExceptionsMap;
typedef Map<const Instance*,ExceptionPathSet*> InstanceExceptionsMap;
typedef Map<const Net*,ExceptionPathSet*> NetExceptionsMap;
typedef UnorderedMap<const EdgePins*,ExceptionPathSet*,
		     PinPairHash, PinPairEqual> EdgeExceptionsMap;
typedef Vector<ExceptionThru*> ExceptionThruSeq;
typedef Map<const Port*,InputDrive*> InputDriveMap;
typedef Map<int, ExceptionPathSet*, std::less<int> > ExceptionPathPtHash;
typedef Set<ClockLatency*, ClockLatencyPinClkLess> ClockLatencies;
typedef Map<const Pin*, ClockUncertainties*> PinClockUncertaintyMap;
typedef Set<InterClockUncertainty*,
	    InterClockUncertaintyLess> InterClockUncertaintySet;
typedef Map<const Clock*, ClockGatingCheck*> ClockGatingCheckMap;
typedef Map<const Instance*, ClockGatingCheck*> InstanceClockGatingCheckMap;
typedef Map<const Pin*, ClockGatingCheck*> PinClockGatingCheckMap;
typedef Set<ClockInsertion*, ClockInsertionPinClkLess> ClockInsertions;
typedef Map<const Pin*, float> PinLatchBorrowLimitMap;
typedef Map<const Instance*, float> InstLatchBorrowLimitMap;
typedef Map<const Clock*, float> ClockLatchBorrowLimitMap;
typedef Set<DataCheck*, DataCheckLess> DataCheckSet;
typedef Map<const Pin*, DataCheckSet*> DataChecksMap;
typedef Map<Port*, PortExtCap*> PortExtCapMap;
typedef Map<Net*, MinMaxFloatValues> NetResistanceMap;
typedef Map<Port*, MinMaxFloatValues> PortSlewLimitMap;
typedef Map<const Pin*, MinMaxFloatValues> PinSlewLimitMap;
typedef Map<Cell*, MinMaxFloatValues> CellSlewLimitMap;
typedef Map<Cell*, MinMaxFloatValues> CellCapLimitMap;
typedef Map<Port*, MinMaxFloatValues> PortCapLimitMap;
typedef Map<Pin*, MinMaxFloatValues> PinCapLimitMap;
typedef Map<Port*, MinMaxFloatValues> PortFanoutLimitMap;
typedef Map<Cell*, MinMaxFloatValues> CellFanoutLimitMap;
typedef Map<Net*, MinMaxFloatValues> NetWireCapMap;
typedef Map<Pin*, MinMaxFloatValues*> PinWireCapMap;
typedef Map<Instance*, Pvt*> InstancePvtMap;
typedef Map<Edge*, ClockLatency*> EdgeClockLatencyMap;
typedef Map<const Pin*, RiseFallValues*> PinMinPulseWidthMap;
typedef Map<const Clock*, RiseFallValues*> ClockMinPulseWidthMap;
typedef Map<const Instance*, RiseFallValues*> InstMinPulseWidthMap;
typedef Map<const Net*, DeratingFactorsNet*> NetDeratingFactorsMap;
typedef Map<const Instance*, DeratingFactorsCell*> InstDeratingFactorsMap;
typedef Map<const LibertyCell*, DeratingFactorsCell*> CellDeratingFactorsMap;
typedef Set<ClockGroups*> ClockGroupsSet;
typedef Map<const Clock*, ClockGroupsSet*> ClockGroupsClkMap;
typedef Map<const char*, ClockGroups*, CharPtrLess> ClockGroupsNameMap;
typedef Map<PinClockPair, ClockSense, PinClockPairLess> ClockSenseMap;
typedef Set<ClkHpinDisable*, ClkHpinDisableLess> ClkHpinDisables;
typedef Set<GroupPath*> GroupPathSet;
typedef Map<const char*, GroupPathSet*, CharPtrLess> GroupPathMap;
typedef Set<ClockPair, ClockPairLess> ClockPairSet;

void
findLeafLoadPins(Pin *pin,
		 const Network *network,
		 PinSet *leaf_pins);
void
findLeafDriverPins(Pin *pin,
		   const Network *network,
		   PinSet *leaf_pins);

class Sdc : public StaState
{
public:
  explicit Sdc(StaState *sta);
  ~Sdc();
  // Note that Search may reference a Filter exception removed by clear().
  void clear();
  // Return true if pin is referenced by any constraint.
  bool isConstrained(const Pin *pin) const;
  // Return true if inst is referenced by any constraint.
  // Does NOT include references by pins connected to the instance.
  bool isConstrained(const Instance *inst) const;
  // Return true if net is referenced by any constraint.
  // Does NOT include references by pins connected to the net.
  bool isConstrained(const Net *net) const;
  // Build data structures for search.
  void searchPreamble();

  // SWIG sdc interface.
  AnalysisType analysisType() { return analysis_type_; }
  void setAnalysisType(AnalysisType analysis_type);
  void setOperatingConditions(OperatingConditions *op_cond,
			      const MinMaxAll *min_max);
  void setOperatingConditions(OperatingConditions *op_cond,
			      const MinMax *min_max);
  void setTimingDerate(TimingDerateType type,
		       PathClkOrData clk_data,
		       const RiseFallBoth *rf,
		       const EarlyLate *early_late,
		       float derate);
  // Delay type is always net for net derating.
  void setTimingDerate(const Net *net,
		       PathClkOrData clk_data,
		       const RiseFallBoth *rf,
		       const EarlyLate *early_late,
		       float derate);
  void setTimingDerate(const Instance *inst,
		       TimingDerateType type,
		       PathClkOrData clk_data,
		       const RiseFallBoth *rf,
		       const EarlyLate *early_late,
		       float derate);
  void setTimingDerate(const LibertyCell *cell,
		       TimingDerateType type,
		       PathClkOrData clk_data,
		       const RiseFallBoth *rf,
		       const EarlyLate *early_late,
		       float derate);
  float timingDerateInstance(const Pin *pin,
			     TimingDerateType type,
			     PathClkOrData clk_data,
			     const RiseFall *rf,
			     const EarlyLate *early_late) const;
  float timingDerateNet(const Pin *pin,
			PathClkOrData clk_data,
			const RiseFall *rf,
			const EarlyLate *early_late) const;
  void unsetTimingDerate();
  void setInputSlew(Port *port, const RiseFallBoth *rf,
		    const MinMaxAll *min_max, float slew);
  // Set the rise/fall drive resistance on design port.
  void setDriveResistance(Port *port,
			  const RiseFallBoth *rf,
			  const MinMaxAll *min_max,
			  float res);
  // Set the drive on design port using external cell timing arcs of
  // cell driven by from_slews between from_port and to_port.
  void setDriveCell(LibertyLibrary *library,
		    LibertyCell *cell,
		    Port *port,
		    LibertyPort *from_port,
		    float *from_slews,
		    LibertyPort *to_port,
		    const RiseFallBoth *rf,
		    const MinMaxAll *min_max);
  void setLatchBorrowLimit(Pin *pin,
			   float limit);
  void setLatchBorrowLimit(Instance *inst,
			   float limit);
  void setLatchBorrowLimit(Clock *clk,
			   float limit);
  // Return the latch borrow limit respecting precidence if multiple
  // limits apply.
  void latchBorrowLimit(Pin *data_pin,
			Pin *enable_pin,
			Clock *clk,
			// Return values.
			float &limit,
			bool &exists);
  void setMinPulseWidth(const RiseFallBoth *rf,
			float min_width);
  void setMinPulseWidth(const Pin *pin,
			const RiseFallBoth *rf,
			float min_width);
  void setMinPulseWidth(const Instance *inst,
			const RiseFallBoth *rf,
			float min_width);
  void setMinPulseWidth(const Clock *clk,
			const RiseFallBoth *rf,
			float min_width);
  // Return min pulse with respecting precidence.
  void minPulseWidth(const Pin *pin,
		     const Clock *clk,
		     const RiseFall *hi_low,
		     float &min_width,
		     bool &exists) const;
  void setSlewLimit(Clock *clk,
		    const RiseFallBoth *rf,
		    const PathClkOrData clk_data,
		    const MinMax *min_max,
		    float slew);
  bool haveClkSlewLimits() const;
  void slewLimit(Clock *clk,
		 const RiseFall *rf,
		 const PathClkOrData clk_data,
		 const MinMax *min_max,
		 float &slew,
		 bool &exists);
  void slewLimit(Port *port,
		 const MinMax *min_max,
		 float &slew,
		 bool &exists);
  void setSlewLimit(Port *port,
		    const MinMax *min_max,
		    float slew);
  void slewLimit(const Pin *pin,
		 const MinMax *min_max,
		 // Return values.
		 float &slew,
		 bool &exists);
  void setSlewLimit(const Pin *pin,
		    const MinMax *min_max,
		    float slew);
  void slewLimitPins(ConstPinSeq &pins);
  void slewLimit(Cell *cell,
		 const MinMax *min_max,
		 float &slew,
		 bool &exists);
  void setSlewLimit(Cell *cell,
		    const MinMax *min_max,
		    float slew);
  void capacitanceLimit(Port *port,
			const MinMax *min_max,
			float &cap,
			bool &exists);
  void capacitanceLimit(Pin *pin,
			const MinMax *min_max,
			float &cap,
			bool &exists);
  void capacitanceLimit(Cell *cell,
			const MinMax *min_max,
			float &cap,
			bool &exists);
  void setCapacitanceLimit(Port *port,
			   const MinMax *min_max,
			   float cap);
  void setCapacitanceLimit(Pin *pin,
			   const MinMax *min_max,
			   float cap);
  void setCapacitanceLimit(Cell *cell,
			   const MinMax *min_max,
			   float cap);
  void fanoutLimit(Port *port,
		   const MinMax *min_max,
		   float &fanout,
		   bool &exists);
  void setFanoutLimit(Port *port,
		      const MinMax *min_max,
		      float fanout);
  void fanoutLimit(Cell *cell,
		   const MinMax *min_max,
		   float &fanout,
		   bool &exists);
  void setFanoutLimit(Cell *cell,
		      const MinMax *min_max,
		      float fanout);
  void setMaxArea(float area);
  float maxArea() const;
  virtual Clock *makeClock(const char *name,
			   PinSet *pins,
			   bool add_to_pins,
			   float period,
			   FloatSeq *waveform,
			   const char *comment);
  // edges size must be 3.
  virtual Clock *makeGeneratedClock(const char *name,
				    PinSet *pins,
				    bool add_to_pins,
				    Pin *src_pin,
				    Clock *master_clk,
				    Pin *pll_out,
				    Pin *pll_fdbk,
				    int divide_by,
				    int multiply_by,
				    float duty_cycle,
				    bool invert,
				    bool combinational,
				    IntSeq *edges,
				    FloatSeq *edge_shifts,
				    const char *comment);
  // Invalidate all generated clock waveforms.
  void invalidateGeneratedClks() const;
  virtual void removeClock(Clock *clk);
  virtual void clockDeletePin(Clock *clk,
			      Pin *pin);
  // Clock used for inputs without defined arrivals.
  ClockEdge *defaultArrivalClockEdge() const;
  Clock *defaultArrivalClock() const { return default_arrival_clk_; }
  // Propagated (non-ideal) clocks.
  void setPropagatedClock(Clock *clk);
  void removePropagatedClock(Clock *clk);
  void setPropagatedClock(Pin *pin);
  void removePropagatedClock(Pin *pin);
  bool isPropagatedClock(const Pin *pin);
  void setClockSlew(Clock *clk,
		    const RiseFallBoth *rf,
		    const MinMaxAll *min_max,
		    float slew);
  void removeClockSlew(Clock *clk);
  // Latency can be on a clk, pin, or clk/pin combination.
  void setClockLatency(Clock *clk,
		       Pin *pin,
		       const RiseFallBoth *rf,
		       const MinMaxAll *min_max,
		       float delay);
  void removeClockLatency(const Clock *clk,
			  const Pin *pin);
  ClockLatency *clockLatency(Edge *edge) const;
  bool hasClockLatency(const Pin *pin) const;
  void clockLatency(Edge *edge,
		    const RiseFall *rf,
		    const MinMax *min_max,
		    // Return values.
		    float &latency,
		    bool &exists) const;
  ClockLatencies *clockLatencies() { return &clk_latencies_; }
  const ClockLatencies *clockLatencies() const { return &clk_latencies_; }
  // Clock latency on pin with respect to clk.
  // This does NOT check for latency on clk (without pin).
  void clockLatency(const Clock *clk,
		    const Pin *pin,
		    const RiseFall *rf,
		    const MinMax *min_max,
		    // Return values.
		    float &latency,
		    bool &exists) const;
  void clockLatency(const Clock *clk,
		    const RiseFall *rf,
		    const MinMax *min_max,
		    // Return values.
		    float &latency,
		    bool &exists) const;
  float clockLatency(const Clock *clk,
		     const RiseFall *rf,
		     const MinMax *min_max) const;
  // Clock insertion delay (set_clk_latency -source).
  // Insertion delay can be on a clk, pin, or clk/pin combination.
  void setClockInsertion(const Clock *clk,
			 const Pin *pin,
			 const RiseFallBoth *rf,
			 const MinMaxAll *min_max,
			 const EarlyLateAll *early_late,
			 float delay);
  void setClockInsertion(const Clock *clk, const Pin *pin,
			 const RiseFall *rf,
			 const MinMax *min_max,
			 const EarlyLate *early_late,
			 float delay);
  void removeClockInsertion(const Clock *clk,
			    const Pin *pin);
  bool hasClockInsertion(const Pin *pin) const;
  float clockInsertion(const Clock *clk,
		       const RiseFall *rf,
		       const MinMax *min_max,
		       const EarlyLate *early_late) const;
  // Respects precedence of pin/clk and set_input_delay on clk pin.
  void clockInsertion(const Clock *clk,
		      const Pin *pin,
		      const RiseFall *rf,
		      const MinMax *min_max,
		      const EarlyLate *early_late,
		      // Return values.
		      float &insertion,
		      bool &exists) const;
  ClockInsertions *clockInsertions() { return clk_insertions_; }
  // Clock uncertainty.
  virtual void setClockUncertainty(Pin *pin,
				   const SetupHoldAll *setup_hold,
				   float uncertainty);
  virtual void removeClockUncertainty(Pin *pin,
				      const SetupHoldAll *setup_hold);
  virtual void setClockUncertainty(Clock *from_clk,
				   const RiseFallBoth *from_rf,
				   Clock *to_clk,
				   const RiseFallBoth *to_rf,
				   const SetupHoldAll *setup_hold,
				   float uncertainty);
  virtual void removeClockUncertainty(Clock *from_clk,
				      const RiseFallBoth *from_rf,
				      Clock *to_clk,
				      const RiseFallBoth *to_rf,
				      const SetupHoldAll *setup_hold);
  ClockGroups *makeClockGroups(const char *name,
			       bool logically_exclusive,
			       bool physically_exclusive,
			       bool asynchronous,
			       bool allow_paths,
			       const char *comment);
  void makeClockGroup(ClockGroups *clk_groups,
		      ClockSet *clks);
  void removeClockGroups(const char *name);
  // nullptr name removes all.
  void removeClockGroupsLogicallyExclusive(const char *name);
  void removeClockGroupsPhysicallyExclusive(const char *name);
  void removeClockGroupsAsynchronous(const char *name);
  bool sameClockGroup(const Clock *clk1,
		      const Clock *clk2);
 // Clocks explicitly excluded by set_clock_group.
  bool sameClockGroupExplicit(const Clock *clk1,
			      const Clock *clk2);
  ClockGroupIterator *clockGroupIterator();
  void setClockSense(PinSet *pins,
		     ClockSet *clks,
		     ClockSense sense);
  bool clkStopPropagation(const Pin *pin,
			  const Clock *clk) const;
  bool clkStopPropagation(const Clock *clk,
			  const Pin *from_pin,
			  const RiseFall *from_rf,
			  const Pin *to_pin,
			  const RiseFall *to_rf) const;
  void setClockGatingCheck(const RiseFallBoth *rf,
			   const SetupHold *setup_hold,
			   float margin);
  void setClockGatingCheck(Instance *inst,
			   const RiseFallBoth *rf,
			   const SetupHold *setup_hold,
			   float margin,
			   LogicValue active_value);
  void setClockGatingCheck(Clock *clk,
			   const RiseFallBoth *rf,
			   const SetupHold *setup_hold,
			   float margin);
  void setClockGatingCheck(const Pin *pin,
			   const RiseFallBoth *rf,
			   const SetupHold *setup_hold,
			   float margin,
			   LogicValue active_value);
  void setDataCheck(Pin *from,
		    const RiseFallBoth *from_rf,
		    Pin *to,
		    const RiseFallBoth *to_rf,
		    Clock *clk,
		    const SetupHoldAll *setup_hold,
		    float margin);
  void removeDataCheck(Pin *from,
		       const RiseFallBoth *from_rf,
		       Pin *to,
		       const RiseFallBoth *to_rf,
		       Clock *clk,
		       const SetupHoldAll *setup_hold);
  DataCheckSet *dataChecksFrom(const Pin *from) const;
  DataCheckSet *dataChecksTo(const Pin *to) const;
  void setInputDelay(Pin *pin,
		     const RiseFallBoth *rf,
		     Clock *clk,
		     const RiseFall *clk_rf,
		     Pin *ref_pin,
		     bool source_latency_included,
		     bool network_latency_included,
		     const MinMaxAll *min_max,
		     bool add, float delay);
  void removeInputDelay(Pin *pin,
			RiseFallBoth *rf,
			Clock *clk,
			RiseFall *clk_rf,
			MinMaxAll *min_max);
  void setOutputDelay(Pin *pin,
		      const RiseFallBoth *rf,
		      Clock *clk,
		      const RiseFall *clk_tr,
		      Pin *ref_pin,
		      bool source_latency_included,
		      bool network_latency_included,
		      const MinMaxAll *min_max,
		      bool add, float delay);
  void removeOutputDelay(Pin *pin,
			 RiseFallBoth *rf,
			 Clock *clk,
			 RiseFall *clk_rf,
			 MinMaxAll *min_max);
  // Set port external pin load (set_load -pin_load port).
  void setPortExtPinCap(Port *port,
			const RiseFall *rf,
			const MinMax *min_max,
			float cap);
  // Set port external wire load (set_load -wire port).
  void setPortExtWireCap(Port *port,
			 bool subtract_pin_cap,
			 const RiseFall *rf,
			 const Corner *corner,
			 const MinMax *min_max,
			 float cap);
  // Remove all "set_load" and "set_fanout_load" annotations.
  void removeLoadCaps();
  // Remove all "set_load net" annotations.
  void removeNetLoadCaps();
  void setNetWireCap(Net *net,
		     bool subtract_pin_cap,
		     const Corner *corner,
		     const MinMax *min_max,
		     float cap);
  bool hasNetWireCap(Net *net) const;
  // True if driver pin net has wire capacitance.
  bool drvrPinHasWireCap(const Pin *pin);
  // Net wire capacitance (set_load -wire net).
  void drvrPinWireCap(const Pin *drvr_pin,
		      const Corner *corner,
		      const MinMax *min_max,
		      // Return values.
		      float &cap,
		      bool &exists) const;
  // Pin capacitance derated by operating conditions and instance pvt.
  float pinCapacitance(const Pin *pin,
		       const RiseFall *rf,
		       const OperatingConditions *op_cond,
		       const Corner *corner,
		       const MinMax *min_max);
  void setResistance(Net *net,
		     const MinMaxAll *min_max,
		     float res);
  void resistance(Net *net,
		  const MinMax *min_max,
		  float &res,
		  bool &exists);
  NetResistanceMap *netResistances() { return &net_res_map_; }
  void setPortExtFanout(Port *port,
			const MinMax *min_max,
			int fanout);
  // set_disable_timing cell [-from] [-to]
  // Disable all edges thru cell if from/to are null.
  // Bus and bundle ports are NOT supported.
  void disable(LibertyCell *cell,
	       LibertyPort *from,
	       LibertyPort *to);
  void removeDisable(LibertyCell *cell,
		     LibertyPort *from,
		     LibertyPort *to);
  // set_disable_timing liberty port.
  // Bus and bundle ports are NOT supported.
  void disable(LibertyPort *port);
  void removeDisable(LibertyPort *port);
  // set_disable_timing port (top level instance port).
  // Bus and bundle ports are NOT supported.
  void disable(Port *port);
  void removeDisable(Port *port);
  // set_disable_timing instance [-from] [-to].
  // Disable all edges thru instance if from/to are null.
  // Bus and bundle ports are NOT supported.
  void disable(Instance *inst,
	       LibertyPort *from,
	       LibertyPort *to);
  void removeDisable(Instance *inst,
		     LibertyPort *from,
		     LibertyPort *to);
  // set_disable_timing pin
  void disable(Pin *pin);
  void removeDisable(Pin *pin);
  // set_disable_timing [get_timing_arc -of_objects instance]]
  void disable(Edge *edge);
  void removeDisable(Edge *edge);
  // set_disable_timing [get_timing_arc -of_objects lib_cell]]
  void disable(TimingArcSet *arc_set);
  void removeDisable(TimingArcSet *arc_set);
  // Disable a wire edge.  From/to pins musts be on the same net.
  // There is no SDC equivalent to this.
  void disable(Pin *from, Pin *to);
  void removeDisable(Pin *from, Pin *to);
  bool isDisabled(const Pin *pin) const;
  // Edge disabled by hierarchical pin disable or instance/cell port pair.
  // Disables do NOT apply to timing checks.
  // inst can be either the from_pin or to_pin instance because it
  // is only referenced when they are the same (non-wire edge).
  bool isDisabled(const Instance *inst,
		  const Pin *from_pin,
		  const Pin *to_pin,
		  const TimingRole *role) const;
  bool isDisabled(Edge *edge);
  bool isDisabled(TimingArcSet *arc_set) const;
  DisabledCellPortsMap *disabledCellPorts();
  DisabledInstancePortsMap *disabledInstancePorts();
  PinSet *disabledPins() { return &disabled_pins_; }
  PortSet *disabledPorts() { return &disabled_ports_; }
  LibertyPortSet *disabledLibPorts() { return &disabled_lib_ports_; }
  EdgeSet *disabledEdges() { return &disabled_edges_; }
  void disableClockGatingCheck(Instance *inst);
  void disableClockGatingCheck(Pin *pin);
  void removeDisableClockGatingCheck(Instance *inst);
  void removeDisableClockGatingCheck(Pin *pin);
  bool isDisableClockGatingCheck(const Pin *pin);
  bool isDisableClockGatingCheck(const Instance *inst);
  // set_LogicValue::zero, set_LogicValue::one, set_logic_dc
  void setLogicValue(Pin *pin,
		     LogicValue value);
  // set_case_analysis
  void setCaseAnalysis(Pin *pin,
		       LogicValue value);
  void removeCaseAnalysis(Pin *pin);
  void logicValue(const Pin *pin,
		  LogicValue &value,
		  bool &exists);
  void caseLogicValue(const Pin *pin, LogicValue &value, bool &exists);
  // Pin has set_case_analysis or set_logic constant value.
  bool hasLogicValue(const Pin *pin);
  // The from/thrus/to arguments passed into the following functions
  // that make exceptions are owned by the constraints once they are
  // passed in.  The constraint internals may change or delete them do
  // to exception merging.
  void makeFalsePath(ExceptionFrom *from,
		     ExceptionThruSeq *thrus,
		     ExceptionTo *to,
		     const MinMaxAll *min_max,
		     const char *comment);
  // Loop paths are false paths used to disable paths around
  // combinational loops when dynamic loop breaking is enabled.
  void makeLoopExceptions();
  void makeLoopExceptions(GraphLoop *loop);
  void makeMulticyclePath(ExceptionFrom *from,
			  ExceptionThruSeq *thrus,
			  ExceptionTo *to,
			  const MinMaxAll *min_max,
			  bool use_end_clk,
			  int path_multiplier,
			  const char *comment);
  void makePathDelay(ExceptionFrom *from,
		     ExceptionThruSeq *thrus,
		     ExceptionTo *to,
		     const MinMax *min_max,
		     bool ignore_clk_latency,
		     float delay,
		     const char *comment);
  bool pathDelaysWithoutTo() const { return path_delays_without_to_; }
  // Delete matching false/multicycle/path_delay exceptions.
  // Caller owns from, thrus, to exception points (and must delete them).
  void resetPath(ExceptionFrom *from,
		 ExceptionThruSeq *thrus,
		 ExceptionTo *to,
		 const MinMaxAll *min_max);
  void makeGroupPath(const char *name,
		     bool is_default,
		     ExceptionFrom *from,
		     ExceptionThruSeq *thrus,
		     ExceptionTo *to,
		     const char *comment);
  GroupPathIterator *groupPathIterator();
  bool isGroupPathName(const char *group_name);
  void addException(ExceptionPath *exception);
  // The pin/clk/instance/net set arguments passed into the following
  // functions that make exception from/thru/to's are owned by the
  // constraints once they are passed in.
  ExceptionFrom *makeExceptionFrom(PinSet *from_pins,
				   ClockSet *from_clks,
				   InstanceSet *from_insts,
				   const RiseFallBoth *from_rf);
  // Make an exception -through specification.
  ExceptionThru *makeExceptionThru(PinSet *pins,
				   NetSet *nets,
				   InstanceSet *insts,
				   const RiseFallBoth *rf);
  bool exceptionToInvalid(const Pin *pin);
  // Make an exception -to specification.
  ExceptionTo *makeExceptionTo(PinSet *pins,
			       ClockSet *clks,
			       InstanceSet *insts,
			       const RiseFallBoth *rf,
			       const RiseFallBoth *end_rf);
  FilterPath *makeFilterPath(ExceptionFrom *from,
			     ExceptionThruSeq *thrus,
			     ExceptionTo *to);
  Clock *findClock(const char *name) const;
  virtual void findClocksMatching(PatternMatch *pattern,
				  ClockSeq *clks) const;
  // Wireload set by set_wire_load_model or default library default_wire_load.
  Wireload *wireloadDefaulted(const MinMax *min_max);
  Wireload *wireload(const MinMax *min_max);
  void setWireload(Wireload *wireload,
		   const MinMaxAll *min_max);
  WireloadMode wireloadMode();
  void setWireloadMode(WireloadMode mode);
  const WireloadSelection *wireloadSelection(const MinMax *min_max);
  void setWireloadSelection(WireloadSelection *selection,
			    const MinMaxAll *min_max);
  // Common reconvergent clock pessimism.
  // TCL variable sta_crpr_enabled.
  bool crprEnabled() const;
  void setCrprEnabled(bool enabled);
  // TCL variable sta_crpr_mode.
  CrprMode crprMode() const;
  void setCrprMode(CrprMode mode);
  // True when analysis type is on chip variation and crpr is enabled.
  bool crprActive() const;
  // TCL variable sta_propagate_gated_clock_enable.
  // Propagate gated clock enable arrivals.
  bool propagateGatedClockEnable() const;
  void setPropagateGatedClockEnable(bool enable);
  // TCL variable sta_preset_clear_arcs_enabled.
  // Enable search through preset/clear arcs.
  bool presetClrArcsEnabled() const;
  void setPresetClrArcsEnabled(bool enable);
  // TCL variable sta_cond_default_arcs_enabled.
  // Enable/disable default arcs when conditional arcs exist.
  bool condDefaultArcsEnabled() const;
  void setCondDefaultArcsEnabled(bool enabled);
  bool isDisabledCondDefault(Edge *edge) const;
  // TCL variable sta_internal_bidirect_instance_paths_enabled.
  // Enable/disable timing from bidirect pins back into the instance.
  bool bidirectInstPathsEnabled() const;
  void setBidirectInstPathsEnabled(bool enabled);
  // TCL variable sta_bidirect_net_paths_enabled.
  // Enable/disable timing from bidirect driver pins to their own loads.
  bool bidirectNetPathsEnabled() const;
  void setBidirectNetPathsEnabled(bool enabled);
  // TCL variable sta_recovery_removal_checks_enabled.
  bool recoveryRemovalChecksEnabled() const;
  void setRecoveryRemovalChecksEnabled(bool enabled);
  // TCL variable sta_gated_clock_checks_enabled.
  bool gatedClkChecksEnabled() const;
  void setGatedClkChecksEnabled(bool enabled);
  // TCL variable sta_dynamic_loop_breaking.
  bool dynamicLoopBreaking() const;
  void setDynamicLoopBreaking(bool enable);
  // TCL variable sta_propagate_all_clocks.
  bool propagateAllClocks() const;
  void setPropagateAllClocks(bool prop);
  // TCL var sta_clock_through_tristate_enabled.
  bool clkThruTristateEnabled() const;
  void setClkThruTristateEnabled(bool enable);
  // TCL variable sta_input_port_default_clock.
  bool useDefaultArrivalClock();
  void setUseDefaultArrivalClock(bool enable);

  // STA interface.
  InputDelaySet *refPinInputDelays(const Pin *ref_pin) const;
  LogicValueMap *logicValues() { return &logic_value_map_; }
  LogicValueMap *caseLogicValues() { return &case_value_map_; }
  // Returns nullptr if set_operating_conditions has not been called.
  OperatingConditions *operatingConditions(const MinMax *min_max);
  // Instance specific process/voltage/temperature.
  Pvt *pvt(Instance *inst, const MinMax *min_max) const;
  // Pvt may be shared among multiple instances.
  void setPvt(Instance *inst,
	      const MinMaxAll *min_max,
	      Pvt *pvt);
  InputDrive *findInputDrive(Port *port);
  // True if pin is defined as a clock source (pin may be hierarchical).
  bool isClock(const Pin *pin) const;
  // True if pin is a clock source vertex.
  bool isLeafPinClock(const Pin *pin) const;
  // True if pin is a non-generated clock source vertex.
  bool isLeafPinNonGeneratedClock(const Pin *pin) const;
  // Find the clocks defined for pin.
  ClockSet *findClocks(const Pin *pin) const;
  ClockSet *findLeafPinClocks(const Pin *pin) const;
  ClockIterator *clockIterator() __attribute__ ((deprecated));
  void sortedClocks(ClockSeq &clks);
  ClockSeq *clocks() { return &clocks_; }
  ClockSeq &clks() { return clocks_; }
  bool clkDisabledByHpinThru(const Clock *clk,
			     const Pin *from_pin,
			     const Pin *to_pin);
  void clkHpinDisablesInvalid();
  ClockUncertainties *clockUncertainties(const Pin *pin);
  void clockUncertainty(const Pin *pin,
			const SetupHold *setup_hold,
			float &uncertainty,
			bool &exists);
  // Inter-clock uncertainty.
  void clockUncertainty(const Clock *src_clk,
			const RiseFall *src_rf,
			const Clock *tgt_clk,
			const RiseFall *tgt_rf,
			const SetupHold *setup_hold,
			float &uncertainty, bool &exists);
  void clockGatingMarginEnablePin(const Pin *enable_pin,
				  const RiseFall *enable_rf,
				  const SetupHold *setup_hold,
				  bool &exists, float &margin);
  void clockGatingMarginInstance(Instance *inst,
				 const RiseFall *enable_rf,
				 const SetupHold *setup_hold,
				 bool &exists, float &margin);
  void clockGatingMarginClkPin(const Pin *clk_pin,
			       const RiseFall *enable_rf,
			       const SetupHold *setup_hold,
			       bool &exists, float &margin);
  void clockGatingMarginClk(const Clock *clk,
			    const RiseFall *enable_rf,
			    const SetupHold *setup_hold,
			    bool &exists, float &margin);
  void clockGatingMargin(const RiseFall *enable_rf,
			 const SetupHold *setup_hold,
			 bool &exists, float &margin);
  // Gated clock active (non-controlling) logic value.
  LogicValue clockGatingActiveValue(const Pin *clk_pin,
				    const Pin *enable_pin);
  // Find the cycle accounting info for paths that start at src clock
  // edge and end at target clock edge.
  CycleAccting *cycleAccting(const ClockEdge *src,
			     const ClockEdge *tgt);
  // Report clock to clock relationships that exceed max_cycle_count.
  void reportClkToClkMaxCycleWarnings();

  const InputDelaySet &inputDelays() const { return input_delays_; }
  // Pin -> input delays.
  const InputDelaysPinMap &inputDelayPinMap() const { return input_delay_pin_map_; }
  // Input delays on leaf_pin.
  InputDelaySet *inputDelaysLeafPin(const Pin *leaf_pin);
  bool hasInputDelay(const Pin *leaf_pin) const;
  // Pin is internal (not top level port) and has an input arrival.
  bool isInputDelayInternal(const Pin *pin) const;

  const OutputDelaySet &outputDelays() const { return output_delays_; }
  // Pin -> output delays.
  const OutputDelaysPinMap &outputDelayPinMap() const { return output_delay_pin_map_; }
  // Output delays on leaf_pin.
  OutputDelaySet *outputDelaysLeafPin(const Pin *leaf_pin);
  bool hasOutputDelay(const Pin *leaf_pin) const;

  PortExtCap *portExtCap(Port *port) const;
  bool hasPortExtCap(Port *port) const;
  void portExtCap(Port *port,
		  const RiseFall *rf,
		  const MinMax *min_max,
		  // Return values.
		  float &pin_cap,
		  bool &has_pin_cap,
		  float &wire_cap,
		  bool &has_wire_cap,
		  int &fanout,
		  bool &has_fanout) const;
  float portExtCap(Port *port,
		   const RiseFall *rf,
		   const MinMax *min_max) const;
  // Connected total capacitance.
  //  pin_cap  = pin capacitance + port external pin
  //  wire_cap = port external wire capacitance + net wire capacitance
  void connectedCap(const Pin *pin,
		    const RiseFall *rf,
		    const OperatingConditions *op_cond,
		    const Corner *corner,
		    const MinMax *min_max,
		    float &pin_cap,
		    float &wire_cap,
		    float &fanout,
		    bool &has_set_load) const;
  void portExtFanout(Port *port,
		     const MinMax *min_max,
		     // Return values.
		     int &fanout,
		     bool &exists);
  int portExtFanout(Port *port,
		    const MinMax *min_max);
  // Return true if search should proceed from pin/clk (no false paths
  // start at pin/clk).  When thru is true, consider -thru exceptions
  // that start at pin/net/instance also).  Transition tr applies to
  // pin, not clk.
  bool exceptionFromStates(const Pin *pin,
			   const RiseFall *rf,
			   const Clock *clk,
			   const RiseFall *clk_rf,
			   const MinMax *min_max,
			   ExceptionStateSet *&states) const;
  bool exceptionFromStates(const Pin *pin,
			   const RiseFall *rf,
			   const Clock *clk,
			   const RiseFall *clk_rf,
			   const MinMax *min_max,
			   bool include_filter,
			   ExceptionStateSet *&states) const;
  void exceptionFromClkStates(const Pin *pin,
			      const RiseFall *rf,
			      const Clock *clk,
			      const RiseFall *clk_rf,
			      const MinMax *min_max,
			      ExceptionStateSet *&states) const;
  void filterRegQStates(const Pin *to_pin,
			const RiseFall *to_rf,
			const MinMax *min_max,
			ExceptionStateSet *&states) const;
  // Return hierarchical -thru exceptions that start between
  // from_pin and to_pin.
  void exceptionThruStates(const Pin *from_pin,
			   const Pin *to_pin,
			   const RiseFall *to_rf,
			   const MinMax *min_max,
			   ExceptionStateSet *&states) const;
  // Find the highest priority exception with first exception pt at
  // pin/clk end.
  void exceptionTo(ExceptionPathType type,
		   const Pin *pin,
		   const RiseFall *rf,
		   const ClockEdge *clk_edge,
		   const MinMax *min_max,
		   bool match_min_max_exactly,
		   // Return values.
		   ExceptionPath *&hi_priority_exception,
		   int &hi_priority) const;
  virtual bool exceptionMatchesTo(ExceptionPath *exception,
				  const Pin *pin,
				  const RiseFall *rf,
				  const ClockEdge *clk_edge,
				  const MinMax *min_max,
				  bool match_min_max_exactly,
				  bool require_to_pin) const;
  bool isCompleteTo(ExceptionState *state,
		    const Pin *pin,
		    const RiseFall *rf,
		    const ClockEdge *clk_edge,
		    const MinMax *min_max,
		    bool match_min_max_exactly,
		    bool require_to_pin) const;
  bool isPathDelayInternalStartpoint(const Pin *pin) const;
  PinSet *pathDelayInternalStartpoints() const;
  bool isPathDelayInternalEndpoint(const Pin *pin) const;
  ExceptionPathSet *exceptions() { return &exceptions_; }
  void deleteExceptions();
  void deleteException(ExceptionPath *exception);
  void recordException(ExceptionPath *exception);
  void unrecordException(ExceptionPath *exception);
  // Annotate graph from constraints.  If the graph exists when the
  // constraints are defined it is annotated incrementally.  This is
  // called after building the graph to annotate any constraints that
  // were defined before the graph is built.
  void annotateGraph(bool annotate);

  // Network edit before/after methods.
  void disconnectPinBefore(Pin *pin);
  void connectPinAfter(Pin *pin);
  void clkHpinDisablesChanged(Pin *pin);
  void makeClkHpinDisable(Clock *clk,
			  Pin *drvr,
			  Pin *load);
  void ensureClkHpinDisables();
  bool bidirectDrvrSlewFromLoad(const Pin *pin) const;

protected:
  void initVariables();
  void clearCycleAcctings();
  void removeLibertyAnnotations();
  void deleteExceptionMap(PinExceptionsMap *&exception_map);
  void deleteExceptionMap(InstanceExceptionsMap *&exception_map);
  void deleteExceptionMap(NetExceptionsMap *&exception_map);
  void deleteExceptionMap(ClockExceptionsMap *&exception_map);
  void deleteExceptionMap(EdgeExceptionsMap *&exception_map);
  void deleteExceptionsReferencing(Clock *clk);
  void deleteClkPinMappings(Clock *clk);
  void deleteExceptionPtHashMapSets(ExceptionPathPtHash &map);
  void makeClkPinMappings(Clock *clk);
  virtual void deletePinClocks(Clock *defining_clk,
			       PinSet *pins);
  void makeDefaultArrivalClock();
  InputDrive *ensureInputDrive(Port *port);
  PortExtCap *ensurePortExtPinCap(Port *port);
  ExceptionPath *findMergeMatch(ExceptionPath *exception);
  void addException1(ExceptionPath *exception);
  void addException2(ExceptionPath *exception);
  void recordPathDelayInternalStartpoints(ExceptionPath *exception);
  void unrecordPathDelayInternalStartpoints(ExceptionFrom *from);
  bool pathDelayFrom(const Pin *pin);
  virtual void recordPathDelayInternalEndpoints(ExceptionPath *exception);
  virtual void unrecordPathDelayInternalEndpoints(ExceptionPath *exception);
  bool pathDelayTo(const Pin *pin);
  bool hasLibertyChecks(const Pin *pin);
  void deleteMatchingExceptions(ExceptionPath *exception);
  void findMatchingExceptions(ExceptionPath *exception,
			      ExceptionPathSet &matches);
  void findMatchingExceptionsFirstFrom(ExceptionPath *exception,
				       ExceptionPathSet &matches);
  void findMatchingExceptionsFirstThru(ExceptionPath *exception,
				       ExceptionPathSet &matches);
  void findMatchingExceptionsFirstTo(ExceptionPath *exception,
				     ExceptionPathSet &matches);
  void findMatchingExceptionsClks(ExceptionPath *exception,
				  ClockSet *clks,
				  ClockExceptionsMap *exception_map,
				  ExceptionPathSet &matches);
  void findMatchingExceptionsPins(ExceptionPath *exception,
				  PinSet *pins,
				  PinExceptionsMap *exception_map,
				  ExceptionPathSet &matches);
  void findMatchingExceptionsInsts(ExceptionPath *exception,
				   InstanceSet *insts,
				   InstanceExceptionsMap *exception_map,
				   ExceptionPathSet &matches);
  void findMatchingExceptions(ExceptionPath *exception,
			      ExceptionPathSet *potential_matches,
			      ExceptionPathSet &matches);
  void expandExceptionExcluding(ExceptionPath *exception,
				ExceptionPath *excluding,
				ExceptionPathSet &expanded_matches);
  void recordException1(ExceptionPath *exception);
  void recordExceptionFirstPts(ExceptionPath *exception);
  void recordExceptionFirstFrom(ExceptionPath *exception);
  void recordExceptionFirstThru(ExceptionPath *exception);
  void recordExceptionFirstTo(ExceptionPath *exception);
  void recordExceptionClks(ExceptionPath *exception,
			   ClockSet *clks,
			   ClockExceptionsMap *&exception_map);
  void recordExceptionInsts(ExceptionPath *exception,
			    InstanceSet *insts,
			    InstanceExceptionsMap *&exception_map);
  void recordExceptionPins(ExceptionPath *exception,
			   PinSet *pins,
			   PinExceptionsMap *&exception_map);
  void recordExceptionNets(ExceptionPath *exception,
			   NetSet *nets,
			   NetExceptionsMap *&exception_map);
  void recordExceptionHpin(ExceptionPath *exception,
			   Pin *pin,
			   PinExceptionsMap *&exception_map);
  void recordExceptionEdges(ExceptionPath *exception,
			    EdgePinsSet *edges,
			    EdgeExceptionsMap *&exception_map);
  void recordMergeHash(ExceptionPath *exception, ExceptionPt *missing_pt);
  void recordMergeHashes(ExceptionPath *exception);
  void unrecordExceptionFirstPts(ExceptionPath *exception);
  void unrecordExceptionClks(ExceptionPath *exception,
			     ClockSet *clks,
			     ClockExceptionsMap *exception_map);
  void unrecordExceptionPins(ExceptionPath *exception,
			     PinSet *pins,
			     PinExceptionsMap *exception_map);
  void unrecordExceptionInsts(ExceptionPath *exception,
			      InstanceSet *insts,
			      InstanceExceptionsMap *exception_map);
  void unrecordExceptionEdges(ExceptionPath *exception,
			      EdgePinsSet *edges,
			      EdgeExceptionsMap *exception_map);
  void unrecordExceptionNets(ExceptionPath *exception,
			     NetSet *nets,
			     NetExceptionsMap *exception_map);
  void unrecordExceptionHpin(ExceptionPath *exception,
			     Pin *pin,
			     PinExceptionsMap *&exception_map);
  void unrecordMergeHashes(ExceptionPath *exception);
  void unrecordMergeHash(ExceptionPath *exception,
			 ExceptionPt *missing_pt);
  void mergeException(ExceptionPath *exception);
  void expandException(ExceptionPath *exception,
		       ExceptionPathSet &expansions);
  bool exceptionFromStates(const ExceptionPathSet *exceptions,
			   const Pin *pin,
			   const RiseFall *rf,
			   const MinMax *min_max,
			   bool include_filter,
			   ExceptionStateSet *&states) const;
  void exceptionThruStates(const ExceptionPathSet *exceptions,
			   const RiseFall *to_rf,
			   const MinMax *min_max,
			   // Return value.
			   ExceptionStateSet *&states) const;
  void exceptionTo(const ExceptionPathSet *to_exceptions,
		   ExceptionPathType type,
		   const Pin *pin,
		   const RiseFall *rf,
		   const ClockEdge *clk_edge,
		   const MinMax *min_max,
		   bool match_min_max_exactly,
		   // Return values.
		   ExceptionPath *&hi_priority_exception,
		   int &hi_priority) const;
  void exceptionTo(ExceptionPath *exception,
		   ExceptionPathType type,
		   const Pin *pin,
		   const RiseFall *rf,
		   const ClockEdge *clk_edge,
		   const MinMax *min_max,
		   bool match_min_max_exactly,
		   // Return values.
		   ExceptionPath *&hi_priority_exception,
		   int &hi_priority) const;
  void makeLoopPath(ExceptionThruSeq *thrus);
  void makeLoopException(Pin *loop_input_pin,
			 Pin *loop_pin,
			 Pin *loop_prev_pin);
  void makeLoopExceptionThru(Pin *pin,
			     ExceptionThruSeq *thrus);
  void deleteLoopExceptions();
  void deleteConstraints();
  InputDelay *findInputDelay(const Pin *pin,
			     ClockEdge *clk_edge,
			     Pin *ref_pin);
  InputDelay *makeInputDelay(Pin *pin,
			     ClockEdge *clk_edge,
			     Pin *ref_pin);
  void deleteInputDelays(Pin *pin,
			 InputDelay *except);
  void deleteInputDelaysReferencing(Clock *clk);
  void deleteInputDelay(InputDelay *input_delay);
  OutputDelay *findOutputDelay(const Pin *pin,
			       ClockEdge *clk_edge,
			       Pin *ref_pin);
  OutputDelay *makeOutputDelay(Pin *pin,
			       ClockEdge *clk_edge,
			       Pin *ref_pin);
  void deleteOutputDelays(Pin *pin, OutputDelay *except);
  void deleteOutputDelaysReferencing(Clock *clk);
  void deleteOutputDelay(OutputDelay *output_delay);
  void deleteInstancePvts();
  void deleteClockInsertion(ClockInsertion *insertion);
  void deleteClockInsertionsReferencing(Clock *clk);
  void deleteInterClockUncertainty(InterClockUncertainty *uncertainties);
  void deleteInterClockUncertaintiesReferencing(Clock *clk);
  void deleteLatchBorrowLimitsReferencing(Clock *clk);
  void deleteMinPulseWidthReferencing(Clock *clk);
  void deleteMasterClkRefs(Clock *clk);
  // Liberty library to look for defaults.
  LibertyLibrary *defaultLibertyLibrary();
  void annotateGraphConstrainOutputs();
  void annotateDisables(bool annotate);
  void annotateGraphDisabled(const Pin *pin,
			     bool annotate);
  void setEdgeDisabledInstPorts(DisabledInstancePorts *disabled_inst,
				bool annotate);
  void setEdgeDisabledInstFrom(Pin *from_pin,
			       bool disable_checks,
			       bool annotate);
  void setEdgeDisabledInstPorts(DisabledPorts *disabled_port,
				Instance *inst,
				bool annotate);
  void deleteClockLatenciesReferencing(Clock *clk);
  void deleteClockLatency(ClockLatency *latency);
  void deleteDeratingFactors();
  void annotateGraphOutputDelays(bool annotate);
  void annotateGraphDataChecks(bool annotate);
  void annotateGraphConstrained(const PinSet *pins,
				bool annotate);
  void annotateGraphConstrained(const InstanceSet *insts,
				bool annotate);
  void annotateGraphConstrained(const Instance *inst,
				bool annotate);
  void annotateGraphConstrained(const Pin *pin,
				bool annotate);
  void annotateHierClkLatency(bool annotate);
  void annotateHierClkLatency(const Pin *hpin,
			      ClockLatency *latency);
  void deannotateHierClkLatency(const Pin *hpin);
  void initInstancePvtMaps();
  void pinCaps(const Pin *pin,
	       const RiseFall *rf,
	       const OperatingConditions *op_cond,
	       const Corner *corner,
	       const MinMax *min_max,
	       float &pin_cap,
	       float &wire_cap,
	       float &fanout,
	       bool &has_ext_cap) const;
  void netCaps(const Pin *drvr_pin,
	       const RiseFall *rf,
	       const OperatingConditions *op_cond,
	       const Corner *corner,
	       const MinMax *min_max,
	       // Return values.
	       float &pin_cap,
	       float &wire_cap,
	       float &fanout,
	       bool &has_set_load) const;
  // connectedCap pin_cap.
  float connectedPinCap(const Pin *pin,
			const RiseFall *rf,
			const OperatingConditions *op_cond,
			const Corner *corner,
			const MinMax *min_max);
  float portCapacitance(Instance *inst, LibertyPort *port,
			const RiseFall *rf,
			const OperatingConditions *op_cond,
			const Corner *corner,
			const MinMax *min_max) const;
  void removeClockGroups(ClockGroups *groups);
  void ensureClkGroupExclusions();
  void makeClkGroupExclusions(ClockGroups *clk_groups);
  void makeClkGroupExclusions1(ClockGroupSet *groups);
  void makeClkGroupExclusions(ClockGroupSet *groups);
  void makeClkGroupSame(ClockGroup *group);
  void clearClkGroupExclusions();
  char *makeClockGroupsName();
  void setClockSense(const Pin *pin,
		     const Clock *clk,
		     ClockSense sense);
  bool clkStopSense(const Pin *to_pin,
		    const Clock *clk,
		    const RiseFall *from_rf,
		    const RiseFall *to_rf) const;
  void disconnectPinBefore(Pin *pin,
			   ExceptionPathSet *exceptions);
  void clockGroupsDeleteClkRefs(Clock *clk);
  void makeVertexClkHpinDisables(Clock *clk,
				 Vertex *vertex,
				 FindClkHpinDisables &visitor);
  void clearGroupPathMap();

  AnalysisType analysis_type_;
  OperatingConditions *operating_conditions_[MinMax::index_count];
  InstancePvtMap *instance_pvt_maps_[MinMax::index_count];
  DeratingFactorsGlobal *derating_factors_;
  NetDeratingFactorsMap *net_derating_factors_;
  InstDeratingFactorsMap *inst_derating_factors_;
  CellDeratingFactorsMap *cell_derating_factors_;
  // Clock sequence retains clock definition order.
  // This is important for getting consistent regression results,
  // which iterating over the name map can't provide.
  ClockSeq clocks_;
  // Clocks are assigned an index.
  int clk_index_;
  // Default clock used for unclocked input arrivals.
  Clock *default_arrival_clk_;
  bool use_default_arrival_clock_;
  ClockNameMap clock_name_map_;
  ClockPinMap clock_pin_map_;
  // Clocks on hierarchical pins are indexed by the load pins.
  ClockPinMap clock_leaf_pin_map_;
  ClkHpinDisables clk_hpin_disables_;
  bool clk_hpin_disables_valid_;
  PinSet propagated_clk_pins_;
  ClockLatencies clk_latencies_;
  ClockInsertions *clk_insertions_;
  PinClockUncertaintyMap pin_clk_uncertainty_map_;
  InterClockUncertaintySet inter_clk_uncertainties_;
  // clk_groups name -> clk_groups
  ClockGroupsNameMap clk_groups_name_map_;
  // clk to clk paths excluded by clock groups.
  ClockPairSet *clk_group_exclusions_;
  // clks in the same set_clock_group set.
  ClockPairSet *clk_group_same_;
  ClockSenseMap clk_sense_map_;
  ClockGatingCheck *clk_gating_check_;
  ClockGatingCheckMap clk_gating_check_map_;
  InstanceClockGatingCheckMap inst_clk_gating_check_map_;
  PinClockGatingCheckMap pin_clk_gating_check_map_;
  CycleAcctingSet cycle_acctings_;
  std::mutex cycle_acctings_lock_;
  DataChecksMap data_checks_from_map_;
  DataChecksMap data_checks_to_map_;

  InputDelaySet input_delays_;
  InputDelaysPinMap input_delay_pin_map_;
  int input_delay_index_;
  InputDelaysPinMap input_delay_ref_pin_map_;
  // Input delays on hierarchical pins are indexed by the load pins.
  InputDelaysPinMap input_delay_leaf_pin_map_;
  InputDelaysPinMap input_delay_internal_pin_map_;

  OutputDelaySet output_delays_;
  OutputDelaysPinMap output_delay_pin_map_;
  OutputDelaysPinMap output_delay_ref_pin_map_;
  // Output delays on hierarchical pins are indexed by the load pins.
  OutputDelaysPinMap output_delay_leaf_pin_map_;

  PortSlewLimitMap port_slew_limit_map_;
  PinSlewLimitMap pin_slew_limit_map_;
  CellSlewLimitMap cell_slew_limit_map_;
  bool have_clk_slew_limits_;
  CellCapLimitMap cell_cap_limit_map_;
  PortCapLimitMap port_cap_limit_map_;
  PinCapLimitMap pin_cap_limit_map_;
  PortFanoutLimitMap port_fanout_limit_map_;
  CellFanoutLimitMap cell_fanout_limit_map_;
  // External parasitics on top level ports.
  //  set_load port
  //  set_fanout_load port
  // Indexed by corner_index.
  PortExtCapMap *port_cap_map_;
  // set_load net
  // Indexed by corner_index.
  NetWireCapMap *net_wire_cap_map_;
  // Indexed by corner_index.
  PinWireCapMap *drvr_pin_wire_cap_map_;
  NetResistanceMap net_res_map_;
  PinSet disabled_pins_;
  PortSet disabled_ports_;
  LibertyPortSet disabled_lib_ports_;
  PinPairSet disabled_wire_edges_;
  EdgeSet disabled_edges_;
  DisabledCellPortsMap disabled_cell_ports_;
  DisabledInstancePortsMap disabled_inst_ports_;
  InstanceSet disabled_clk_gating_checks_inst_;
  PinSet disabled_clk_gating_checks_pin_;
  ExceptionPathSet exceptions_;

  // First pin/clock/instance/net/edge exception point to exception set map.
  PinExceptionsMap *first_from_pin_exceptions_;
  ClockExceptionsMap *first_from_clk_exceptions_;
  InstanceExceptionsMap *first_from_inst_exceptions_;
  PinExceptionsMap *first_thru_pin_exceptions_;
  InstanceExceptionsMap *first_thru_inst_exceptions_;
  // Nets that have exception -thru nets.
  NetExceptionsMap *first_thru_net_exceptions_;
  PinExceptionsMap *first_to_pin_exceptions_;
  ClockExceptionsMap *first_to_clk_exceptions_;
  InstanceExceptionsMap *first_to_inst_exceptions_;
  // Edges that traverse hierarchical exception pins.
  EdgeExceptionsMap *first_thru_edge_exceptions_;

  // Exception hash with one missing from/thru/to point, used for merging.
  ExceptionPathPtHash exception_merge_hash_;
  // Path delay -from pin internal startpoints.
  PinSet *path_delay_internal_startpoints_;
  // Path delay -to pin internal endpoints.
  PinSet *path_delay_internal_endpoints_;
  // There is a path delay exception without a -to.
  bool path_delays_without_to_;
  // Group path exception names.
  GroupPathMap group_path_map_;
  InputDriveMap input_drive_map_;
  // set_LogicValue::one/zero/dc
  LogicValueMap logic_value_map_;
  // set_case_analysis
  LogicValueMap case_value_map_;
  PinLatchBorrowLimitMap pin_latch_borrow_limit_map_;
  InstLatchBorrowLimitMap inst_latch_borrow_limit_map_;
  ClockLatchBorrowLimitMap clk_latch_borrow_limit_map_;
  RiseFallValues min_pulse_width_;
  PinMinPulseWidthMap pin_min_pulse_width_map_;
  InstMinPulseWidthMap inst_min_pulse_width_map_;
  ClockMinPulseWidthMap clk_min_pulse_width_map_;
  float max_area_;
  Wireload *wireload_[MinMax::index_count];
  WireloadMode wireload_mode_;
  WireloadSelection *wireload_selection_[MinMax::index_count];
  bool crpr_enabled_;
  CrprMode crpr_mode_;
  bool pocv_enabled_;
  bool propagate_gated_clock_enable_;
  bool preset_clr_arcs_enabled_;
  bool cond_default_arcs_enabled_;
  bool bidirect_net_paths_enabled_;
  bool bidirect_inst_paths_enabled_;
  bool recovery_removal_checks_enabled_;
  bool gated_clk_checks_enabled_;
  bool clk_thru_tristate_enabled_;
  bool dynamic_loop_breaking_;
  bool propagate_all_clks_;

  // Annotations on graph objects that are stored in constraints
  // rather on the graph itself.
  EdgeClockLatencyMap edge_clk_latency_;

private:
  DISALLOW_COPY_AND_ASSIGN(Sdc);

  friend class WriteSdc;
  friend class FindNetCaps;
  friend class ClockGroupIterator;
  friend class GroupPathIterator;
};

class ClockIterator : public ClockSeq::Iterator
{
public:
  ClockIterator(Sdc *sdc);

private:
  ClockIterator(ClockSeq &clocks);
  friend class Sdc;
  DISALLOW_COPY_AND_ASSIGN(ClockIterator);
};

class ClockGroupIterator : public ClockGroupsNameMap::Iterator
{
public:
  ClockGroupIterator(Sdc *sdc);

private:
  ClockGroupIterator(ClockGroupsNameMap &clk_groups_name_map);

  friend class Sdc;
  DISALLOW_COPY_AND_ASSIGN(ClockGroupIterator);
};

class GroupPathIterator : public GroupPathMap::Iterator
{
public:
  GroupPathIterator(Sdc *sdc);

private:
  GroupPathIterator(GroupPathMap &group_path_map);

  friend class Sdc;
  DISALLOW_COPY_AND_ASSIGN(GroupPathIterator);
};

} // namespace
#endif