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ExceptionPath.cc
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// OpenSTA, Static Timing Analyzer
// Copyright (c) 2020, 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/>.
#include "ExceptionPath.hh"
#include <algorithm>
#include "DisallowCopyAssign.hh"
#include "MinMax.hh"
#include "TimingRole.hh"
#include "Units.hh"
#include "Transition.hh"
#include "PortDirection.hh"
#include "Network.hh"
#include "NetworkCmp.hh"
#include "Clock.hh"
namespace sta {
static bool
thrusIntersectPts(ExceptionThruSeq *thrus1,
ExceptionThruSeq *thrus2);
static void
insertPinPairsThruHierPin(const Pin *hpin,
const Network *network,
PinPairSet *pairs);
static void
insertPinPairsThruNet(Net *net,
const Network *network,
PinPairSet *pairs);
static void
deletePinPairsThruHierPin(const Pin *hpin,
const Network *network,
PinPairSet *pairs);
static int
setNameCmp(PinSet *set1,
PinSet *set2,
const Network *network)
{
size_t size1 = set1 ? set1->size() : 0;
size_t size2 = set2 ? set2->size() : 0;
if (size1 == size2) {
PinSet::ConstIterator iter1(set1);
PinSet::ConstIterator iter2(set2);
while (iter1.hasNext() && iter2.hasNext()) {
Pin *pin1 = iter1.next();
Pin *pin2 = iter2.next();
const char *name1 = network->pathName(pin1);
const char *name2 = network->pathName(pin2);
int cmp = strcmp(name1, name2);
if (cmp != 0)
return cmp;
}
// Sets are equal.
return 0;
}
else
return (size1 > size2) ? 1 : -1;
}
static int
setNameCmp(ClockSet *set1,
ClockSet *set2)
{
size_t size1 = set1 ? set1->size() : 0;
size_t size2 = set2 ? set2->size() : 0;
if (size1 == size2) {
ClockSet::ConstIterator iter1(set1);
ClockSet::ConstIterator iter2(set2);
while (iter1.hasNext() && iter2.hasNext()) {
Clock *clk1 = iter1.next();
Clock *clk2 = iter2.next();
int cmp = clk1->index() - clk2->index();
if (cmp != 0)
return cmp;
}
// Sets are equal.
return 0;
}
else
return (size1 > size2) ? 1 : -1;
}
static int
setNameCmp(InstanceSet *set1,
InstanceSet *set2,
const Network *network)
{
size_t size1 = set1 ? set1->size() : 0;
size_t size2 = set2 ? set2->size() : 0;
if (size1 == size2) {
InstanceSet::ConstIterator iter1(set1);
InstanceSet::ConstIterator iter2(set2);
while (iter1.hasNext() && iter2.hasNext()) {
Instance *inst1 = iter1.next();
Instance *inst2 = iter2.next();
const char *name1 = network->pathName(inst1);
const char *name2 = network->pathName(inst2);
int cmp = strcmp(name1, name2);
if (cmp != 0)
return cmp;
}
// Sets are equal.
return 0;
}
else
return (size1 > size2) ? 1 : -1;
}
static int
setNameCmp(NetSet *set1,
NetSet *set2,
const Network *network)
{
size_t size1 = set1 ? set1->size() : 0;
size_t size2 = set2 ? set2->size() : 0;
if (size1 == size2) {
NetSet::ConstIterator iter1(set1);
NetSet::ConstIterator iter2(set2);
while (iter1.hasNext() && iter2.hasNext()) {
Net *net1 = iter1.next();
Net *net2 = iter2.next();
const char *name1 = network->pathName(net1);
const char *name2 = network->pathName(net2);
int cmp = strcmp(name1, name2);
if (cmp != 0)
return cmp;
}
// Sets are equal.
return 0;
}
else
return (size1 > size2) ? 1 : -1;
}
////////////////////////////////////////////////////////////////
const char *
EmptyExpceptionPt::what() const noexcept
{
return "empty exception from/through/to.";
}
void
checkFromThrusTo(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to)
{
bool found_empty = ((from && !from->hasObjects())
|| (to
&& (!to->hasObjects()
&& to->transition()
== RiseFallBoth::riseFall()
&& (to->endTransition()
== RiseFallBoth::riseFall()))));
if (thrus) {
ExceptionThruSeq::Iterator thru_iter(thrus);
while (thru_iter.hasNext()) {
ExceptionThru *thru = thru_iter.next();
if (!thru->hasObjects())
found_empty = true;
}
}
if (found_empty)
throw EmptyExpceptionPt();
}
ExceptionPath::ExceptionPath(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
const MinMaxAll *min_max,
bool own_pts,
int priority,
const char *comment) :
SdcCmdComment(comment),
from_(from),
thrus_(thrus),
to_(to),
min_max_(min_max),
own_pts_(own_pts),
priority_(priority)
{
makeStates();
}
ExceptionPath::~ExceptionPath()
{
if (own_pts_) {
delete from_;
delete to_;
if (thrus_) {
thrus_->deleteContents();
delete thrus_;
}
}
ExceptionState *state, *next_state;
for (state = states_; state; state = next_state) {
next_state = state->nextState();
delete state;
}
}
const char *
ExceptionPath::asString(const Network *network) const
{
const char *from_thru_to = fromThruToString(network);
const char *type = typeString();
size_t length = strlen(type) + strlen(from_thru_to) + 1;
char *result = makeTmpString(length);
char *r = result;
stringAppend(r, type);
stringAppend(r, from_thru_to);
return result;
}
ExceptionPt *
ExceptionPath::firstPt()
{
if (from_)
return from_;
else if (thrus_ && !thrus_->empty())
return (*thrus_)[0];
else if (to_)
return to_;
else
return nullptr;
}
bool
ExceptionPath::matchesFirstPt(const RiseFall *to_rf,
const MinMax *min_max)
{
ExceptionPt *first_pt = firstPt();
return first_pt->transition()->matches(to_rf)
&& matches(min_max, false);
}
bool
ExceptionPath::matches(const MinMax *min_max,
bool) const
{
return min_max_->matches(min_max);
}
void
ExceptionPath::setPriority(int priority)
{
priority_ = priority;
}
////////////////////////////////////////////////////////////////
// Exception precedence relative to from/thru/to pins/clocks:
// Priority order:
// 1) -from pin/instance/port
// 2) -to pin/instance/port
// 3) -through pin
// 4) -from clock
// 5) -to clock
//
// Foreach priority level (from 1 to 5)
// If the exception has this type of qualifier, it takes
// priority over an exception without this type of qualifier.
int
ExceptionPath::fromThruToPriority(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to)
{
int priority = 0;
if (from && (from->hasPins() || from->hasInstances()))
priority |= (1 << 6);
if (to && (to->hasPins() || to->hasInstances()))
priority |= (1 << 5);
if (thrus && !thrus->empty())
priority |= (1 << 4);
if (from && from->hasClocks())
priority |= (1 << 3);
if (to && to->hasClocks())
priority |= (1 << 2);
// Leave room for minMaxPriority() which uses bits 0 and 1.
return priority;
}
size_t
ExceptionPath::hash() const
{
return hash(nullptr);
}
size_t
ExceptionPath::hash(ExceptionPt *missing_pt) const
{
size_t hash = typePriority();
int pot = 32;
ExceptionPtIterator pt_iter(this);
while (pt_iter.hasNext()) {
ExceptionPt *pt = pt_iter.next();
if (pt != missing_pt)
hash += pt->hash() * (pot - 1);
pot *= 2;
}
return hash;
}
bool
ExceptionPath::mergeable(ExceptionPath *exception) const
{
return stringEqualIf(comment_, exception->comment());
}
bool
ExceptionPath::mergeablePts(ExceptionPath *exception) const
{
ExceptionPt *ignore;
return mergeablePts(exception, nullptr, ignore);
}
bool
ExceptionPath::mergeablePts(ExceptionPath *exception2,
ExceptionPt *missing_pt2,
ExceptionPt *&missing_pt) const
{
missing_pt = nullptr;
ExceptionFrom *from2 = exception2->from();
if ((from_ && from2
&& !(from_->transition() == from2->transition()
&& (from2 == missing_pt2
|| from_->equal(from2))))
|| (from_ && from2 == nullptr)
|| (from_ == nullptr && from2))
return false;
if (from2 == missing_pt2)
missing_pt = from_;
ExceptionThruSeq::Iterator thru_iter(thrus_);
ExceptionThruSeq::Iterator thru_iter2(exception2->thrus());
while (thru_iter.hasNext()
&& thru_iter2.hasNext()) {
ExceptionThru *thru = thru_iter.next();
ExceptionThru *thru2 = thru_iter2.next();
if (!(thru->transition() == thru2->transition()
&& (thru2 == missing_pt2
|| thru->equal(thru))))
return false;
if (thru2 == missing_pt2)
missing_pt = thru;
}
if (thru_iter.hasNext()
|| thru_iter2.hasNext())
return false;
ExceptionTo *to2 = exception2->to();
if ((to_ && to2
&& !(to_->transition() == to2->transition()
&& to_->endTransition() == to2->endTransition()
&& (to2 == missing_pt2
|| to_->equal(to2))))
|| (to_ && to2 == nullptr)
|| (to_ == nullptr && to2))
return false;
if (to2 == missing_pt2)
missing_pt = to_;
return true;
}
bool
ExceptionPath::intersectsPts(ExceptionPath *exception) const
{
ExceptionFrom *from2 = exception->from();
ExceptionThruSeq *thrus2 = exception->thrus();
ExceptionTo *to2 = exception->to();
if (((from_ == nullptr && from2 == nullptr)
|| (from_ && from2 && from_->intersectsPts(from2)))
&& ((thrus_ == nullptr && thrus2 == nullptr)
|| (thrus_ && thrus2 && thrus_->size() == thrus2->size()))
&& ((to_ == nullptr && to2 == nullptr)
|| (to_ && to2 && to_->intersectsPts(to2)))) {
ExceptionThruSeq::Iterator thrus_iter1(thrus_);
ExceptionThruSeq::Iterator thrus_iter2(thrus2);
while (thrus_iter1.hasNext() && thrus_iter2.hasNext()) {
ExceptionThru *thru1 = thrus_iter1.next();
ExceptionThru *thru2 = thrus_iter2.next();
if (!thru1->intersectsPts(thru2))
return false;
}
return true;
}
return false;
}
const char *
ExceptionPath::fromThruToString(const Network *network) const
{
string str;
if (min_max_ != MinMaxAll::all()) {
str += " -";
str += min_max_->asString();
}
if (from_)
str += from_->asString(network);
if (thrus_) {
str += " -thru";
bool first_thru = true;
ExceptionThruSeq::Iterator thru_iter(thrus_);
while (thru_iter.hasNext()) {
ExceptionThru *thru = thru_iter.next();
if (!first_thru)
str += " &&";
str += " {";
str += thru->asString(network);
str += "}";
first_thru = false;
}
}
if (to_)
str += to_->asString(network);
char *result = makeTmpString(str.size() + 1);
strcpy(result, str.c_str());
return result;
}
ExceptionState *
ExceptionPath::firstState()
{
return states_;
}
void
ExceptionPath::makeStates()
{
if (thrus_) {
ExceptionState *prev_state = nullptr;
ExceptionThruSeq::Iterator thru_iter(thrus_);
bool first = true;
int index = 0;
while (thru_iter.hasNext()) {
ExceptionThru *thru = thru_iter.next();
// No state for first -thru if no -from,since it kicks off the exception.
if (!(from_ == nullptr && first)) {
ExceptionState *state = new ExceptionState(this, thru, index);
if (prev_state)
prev_state->setNextState(state);
else
states_ = state;
prev_state = state;
}
first = false;
index++;
}
// Last state indicates all the thrus have been traversed.
ExceptionState *state = new ExceptionState(this, nullptr, index);
if (prev_state)
prev_state->setNextState(state);
else
states_ = state;
}
else
states_ = new ExceptionState(this, nullptr, 0);
}
bool
ExceptionPath::resetMatch(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
const MinMaxAll *min_max)
{
// Only the reset expception points need to match.
// For example, if the reset is -from, it matches any
// exceptions that match the -from even if they are more specific.
// -from
return ((from && from_
&& thrus == nullptr
&& to == nullptr
&& from_->intersectsPts(from))
// -thru
|| (from == nullptr
&& thrus && thrus_
&& to == nullptr
&& thrusIntersectPts(thrus_, thrus))
// -to
|| (from == nullptr
&& thrus == nullptr
&& to && to_
&& to_->intersectsPts(to))
// -from -thru
|| (from && from_
&& thrus && thrus_
&& to == nullptr
&& from_->intersectsPts(from)
&& thrusIntersectPts(thrus_, thrus))
// -from -to
|| (from && from_
&& thrus == nullptr
&& to && to_
&& from_->intersectsPts(from)
&& to_->intersectsPts(to))
// -thru -to
|| (from == nullptr
&& thrus && thrus_
&& to && to_
&& thrusIntersectPts(thrus_, thrus)
&& to_->intersectsPts(to))
// -from -thru -to
|| (from && from_
&& thrus && thrus_
&& to && to_
&& from_->intersectsPts(from)
&& thrusIntersectPts(thrus_, thrus)
&& to_->intersectsPts(to)))
&& (min_max == MinMaxAll::all()
|| min_max_ == min_max);
}
static bool
thrusIntersectPts(ExceptionThruSeq *thrus1,
ExceptionThruSeq *thrus2)
{
ExceptionThruSeq::Iterator thrus_iter1(thrus1);
ExceptionThruSeq::Iterator thrus_iter2(thrus2);
while (thrus_iter1.hasNext() && thrus_iter2.hasNext()) {
ExceptionThru *thru1 = thrus_iter1.next();
ExceptionThru *thru2 = thrus_iter2.next();
if (!thru1->intersectsPts(thru2))
return false;
}
return true;
}
////////////////////////////////////////////////////////////////
PathDelay::PathDelay(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
const MinMax *min_max,
bool ignore_clk_latency,
float delay,
bool own_pts,
const char *comment) :
ExceptionPath(from, thrus, to, min_max->asMinMaxAll(), own_pts,
pathDelayPriority() + fromThruToPriority(from, thrus, to),
comment),
ignore_clk_latency_(ignore_clk_latency),
delay_(delay)
{
}
ExceptionPath *
PathDelay::clone(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
bool own_pts)
{
return new PathDelay(from, thrus, to, min_max_->asMinMax(),
ignore_clk_latency_, delay_, own_pts,
comment_);
}
int
PathDelay::typePriority() const
{
return pathDelayPriority();
}
bool
PathDelay::tighterThan(ExceptionPath *exception) const
{
if (min_max_->asMinMax() == MinMax::min())
return delay_ > exception->delay();
else
return delay_ < exception->delay();
}
const char *
PathDelay::asString(const Network *network) const
{
const char *from_thru_to = fromThruToString(network);
const char *result = stringPrintTmp("PathDelay %.3fns%s",
delay_ * 1E+9F,
from_thru_to);
return result;
}
const char *
PathDelay::typeString() const
{
return "Path";
}
bool
PathDelay::mergeable(ExceptionPath *exception) const
{
return ExceptionPath::mergeable(exception)
&& overrides(exception)
&& exception->ignoreClkLatency() == ignore_clk_latency_
&& exception->delay() == delay_;
}
bool
PathDelay::overrides(ExceptionPath *exception) const
{
return exception->isPathDelay()
&& exception->priority() == priority_
&& exception->minMax() == min_max_;
}
////////////////////////////////////////////////////////////////
FalsePath::FalsePath(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
const MinMaxAll *min_max,
bool own_pts,
const char *comment) :
ExceptionPath(from, thrus, to, min_max, own_pts,
falsePathPriority() + fromThruToPriority(from, thrus, to),
comment)
{
}
FalsePath::FalsePath(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
const MinMaxAll *min_max,
bool own_pts,
int priority,
const char *comment) :
ExceptionPath(from, thrus, to, min_max, own_pts, priority, comment)
{
}
ExceptionPath *
FalsePath::clone(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
bool own_pts)
{
return new FalsePath(from, thrus, to, min_max_, own_pts, comment_);
}
int
FalsePath::typePriority() const
{
return falsePathPriority();
}
bool
FalsePath::tighterThan(ExceptionPath *) const
{
return false;
}
const char *
FalsePath::typeString() const
{
return "False";
}
bool
FalsePath::mergeable(ExceptionPath *exception) const
{
return ExceptionPath::mergeable(exception)
&& overrides(exception);
}
bool
FalsePath::overrides(ExceptionPath *exception) const
{
return exception->priority() == priority()
&& exception->minMax() == min_max_;
}
////////////////////////////////////////////////////////////////
LoopPath::LoopPath(ExceptionThruSeq *thrus, bool own_pts) :
FalsePath(nullptr, thrus, nullptr, MinMaxAll::all(), own_pts,
falsePathPriority() + fromThruToPriority(nullptr, thrus, nullptr),
nullptr)
{
}
const char *
LoopPath::typeString() const
{
return "Loop";
}
bool
LoopPath::mergeable(ExceptionPath *) const
{
return false;
}
////////////////////////////////////////////////////////////////
MultiCyclePath::MultiCyclePath(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
const MinMaxAll *min_max,
bool use_end_clk,
int path_multiplier,
bool own_pts,
const char *comment) :
ExceptionPath(from, thrus, to, min_max, own_pts,
multiCyclePathPriority() + fromThruToPriority(from, thrus, to),
comment),
use_end_clk_(use_end_clk),
path_multiplier_(path_multiplier)
{
}
ExceptionPath *
MultiCyclePath::clone(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
bool own_pts)
{
return new MultiCyclePath(from, thrus, to, min_max_, use_end_clk_,
path_multiplier_, own_pts, comment_);
}
int
MultiCyclePath::pathMultiplier(const MinMax *min_max) const
{
if (min_max_ == MinMaxAll::all()
&& min_max == MinMax::min())
// Path multiplier is zero if no -setup/-hold is specified.
return 0;
else
return path_multiplier_;
}
int
MultiCyclePath::priority(const MinMax *min_max) const
{
if (min_max_ == MinMaxAll::all())
return priority_ + 1;
else if (min_max_->asMinMax() == min_max)
return priority_ + 2;
else
return priority_;
}
int
MultiCyclePath::typePriority() const
{
return multiCyclePathPriority();
}
bool
MultiCyclePath::tighterThan(ExceptionPath *exception) const
{
return path_multiplier_ < exception->pathMultiplier();
}
bool
MultiCyclePath::matches(const MinMax *min_max,
bool exactly) const
{
return min_max_->matches(min_max)
// set_multicycle_path -setup determines hold check accounting,
// so they must be propagated for min (hold) paths.
|| (!exactly && min_max == MinMax::min());
}
const char *
MultiCyclePath::asString(const Network *network) const
{
const char *from_thru_to = fromThruToString(network);
const char *result = stringPrintTmp("Multicycle %s %d%s",
(use_end_clk_) ? "-end" : "-start",
path_multiplier_,
from_thru_to);
return result;
}
const char *
MultiCyclePath::typeString() const
{
return "Multicycle";
}
bool
MultiCyclePath::mergeable(ExceptionPath *exception) const
{
return ExceptionPath::mergeable(exception)
&& overrides(exception)
&& exception->pathMultiplier() == path_multiplier_;
}
bool
MultiCyclePath::overrides(ExceptionPath *exception) const
{
return exception->isMultiCycle()
&& exception->priority() == priority()
&& exception->minMax() == min_max_;
}
////////////////////////////////////////////////////////////////
FilterPath::FilterPath(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
bool own_pts) :
ExceptionPath(from, thrus, to, MinMaxAll::all(), own_pts,
filterPathPriority() + fromThruToPriority(from, thrus, to),
nullptr)
{
}
const char *
FilterPath::typeString() const
{
return "Filter";
}
ExceptionPath *
FilterPath::clone(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
bool own_pts)
{
return new FilterPath(from, thrus, to, own_pts);
}
int
FilterPath::typePriority() const
{
return filterPathPriority();
}
bool
FilterPath::tighterThan(ExceptionPath *) const
{
return false;
}
// Filter paths are used for report -from/-thru/-to as well as
// generated clock insertion delays so do not let them merge.
bool
FilterPath::mergeable(ExceptionPath *) const
{
return false;
}
bool
FilterPath::overrides(ExceptionPath *) const
{
return false;
}
bool
FilterPath::resetMatch(ExceptionFrom *,
ExceptionThruSeq *,
ExceptionTo *,
const MinMaxAll *)
{
return false;
}
////////////////////////////////////////////////////////////////
GroupPath::GroupPath(const char *name,
bool is_default,
ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
bool own_pts,
const char *comment) :
ExceptionPath(from, thrus, to, MinMaxAll::all(), own_pts,
groupPathPriority() + fromThruToPriority(from, thrus, to),
comment),
name_(stringCopy(name)),
is_default_(is_default)
{
}
GroupPath::~GroupPath()
{
stringDelete(name_);
}
const char *
GroupPath::typeString() const
{
return "Group";
}
ExceptionPath *
GroupPath::clone(ExceptionFrom *from,
ExceptionThruSeq *thrus,
ExceptionTo *to,
bool own_pts)
{
return new GroupPath(name_, is_default_, from, thrus, to, own_pts,
comment_);
}
int
GroupPath::typePriority() const
{
return groupPathPriority();
}
bool
GroupPath::tighterThan(ExceptionPath *) const
{
return false;
}
bool
GroupPath::mergeable(ExceptionPath *exception) const
{
return ExceptionPath::mergeable(exception)
&& overrides(exception);
}
bool
GroupPath::overrides(ExceptionPath *exception) const
{
return exception->isGroupPath()
&& is_default_ == exception->isDefault()
&& stringEqIf(name_, exception->name());
}
////////////////////////////////////////////////////////////////
const int ExceptionPt::as_string_max_objects_ = 20;
ExceptionPt::ExceptionPt(const RiseFallBoth *rf,
bool own_pts) :
rf_(rf),
own_pts_(own_pts),
hash_(0)
{
}
// ExceptionPt initialization functions set hash_ and incrementally
// maintain the value.
size_t
ExceptionPt::hash() const
{
return hash_;
}
ExceptionFromTo::ExceptionFromTo(PinSet *pins,
ClockSet *clks,
InstanceSet *insts,
const RiseFallBoth *rf,
bool own_pts) :
ExceptionPt(rf, own_pts),
pins_(pins),
clks_(clks),
insts_(insts)
{
// Delete empty sets.
if (pins_ && pins_->empty()) {
if (own_pts)
delete pins_;
pins_ = nullptr;
}
if (clks_ && clks_->empty()) {
if (own_pts)
delete clks_;
clks_ = nullptr;
}
if (insts_ && insts_->empty()) {
if (own_pts)
delete insts_;
insts_ = nullptr;
}
findHash();
}
ExceptionFromTo::~ExceptionFromTo()
{
if (own_pts_) {
delete pins_;
delete clks_;
delete insts_;
}
}
bool
ExceptionFromTo::hasPins() const