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change propagation

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This commit is contained in:
Oleg Nikitin
2025-12-27 13:30:25 +03:00
parent 032cdb9b03
commit 3eb09fe5cf
3 changed files with 92 additions and 33 deletions
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91
src/ArrayConstantPropagation/propagation.cpp
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@@ -10,6 +10,7 @@
using namespace std;
static SgStatement* declPlace = NULL;
static unordered_set<SgStatement*> changed;;
static bool CheckConstIndexes(SgExpression* exp)
{
@@ -36,13 +37,13 @@ static bool CheckConstIndexes(SgExpression* exp)
static SgExpression* CreateVar(int& variableNumber, SgType* type)
{
string varName = "__tmp_prop_var";
string varName = "tmp_prop_var";
string name = varName + std::to_string(variableNumber) + "__";
variableNumber++;
SgSymbol* varSymbol = new SgSymbol(VARIABLE_NAME, name.c_str(), *type, *declPlace->controlParent());
const string commonBlockName = "__propagation_common__";
const string commonBlockName = "propagation_common__";
SgStatement* funcStart = declPlace->controlParent();
SgStatement* commonStat = NULL;
@@ -169,8 +170,7 @@ static SgExpression* CreateVar(int& variableNumber, SgType* type)
commonList->setLhs(varList);
}
return new SgExpression(VAR_REF, NULL, NULL, varSymbol, type->copyPtr());
return new SgExpression(VAR_REF, NULL, NULL, varSymbol, type->copyPtr());
}
static void TransformRightPart(SgStatement* st, SgExpression* exp, unordered_map<string, SgExpression*>& arrayToVariable, int& variableNumber)
@@ -227,6 +227,8 @@ static void TransformLeftPart(SgStatement* st, SgExpression* exp, unordered_map<
{
if (exp->symbol()->type()->variant() == T_STRING)
return;
if (changed.find(st) != changed.end())
return;
string expUnparsed = exp->unparse();
if (arrayToVariable.find(expUnparsed) == arrayToVariable.end() && exp->symbol()->type()->baseType())
{
@@ -234,12 +236,62 @@ static void TransformLeftPart(SgStatement* st, SgExpression* exp, unordered_map<
}
SgStatement* newStatement = new SgStatement(ASSIGN_STAT, NULL, NULL, arrayToVariable[expUnparsed]->copyPtr(), st->expr(1)->copyPtr(), NULL);
newStatement->setFileId(st->getFileId());
newStatement->setFileId(st->getFileId());
newStatement->setProject(st->getProject());
newStatement->setlineNumber(getNextNegativeLineNumber());
newStatement->setLocalLineNumber(st->lineNumber());
st->insertStmtBefore(*newStatement, *st->controlParent());
changed.insert(st);
}
static void TransformBorder(SgStatement* st, SgExpression* exp, unordered_map<string, SgExpression*>& arrayToVariable, int& variableNumber)
{
SgStatement* firstStatement = declPlace->lexPrev();
st = st->lexPrev();
string array = exp->unparse();
arrayToVariable[array] = CreateVar(variableNumber, exp->symbol()->type()->baseType());
while (st != firstStatement)
{
if (st->variant() == ASSIGN_STAT && arrayToVariable.find(st->expr(0)->unparse()) != arrayToVariable.end())
{
if (st->expr(1))
{
TransformRightPart(st, st->expr(1), arrayToVariable, variableNumber);
}
if (st->expr(0) && st->expr(0)->variant() == ARRAY_REF && CheckConstIndexes(st->expr(0)->lhs()) && arrayToVariable.find(st->expr(0)->unparse()) != arrayToVariable.end())
{
TransformLeftPart(st, st->expr(0), arrayToVariable, variableNumber);
}
}
st = st->lexPrev();
}
}
static void CheckVariable(SgStatement* st, SgExpression* exp, unordered_map<string, SgExpression*>& arrayToVariable, int& variableNumber)
{
SgStatement* firstStatement = declPlace->lexPrev();
st = st->lexPrev();
string varName = exp->unparse();
while (st != firstStatement)
{
if (st->variant() == ASSIGN_STAT && st->expr(0)->symbol() == exp->symbol())
{
TransformRightPart(st, st->expr(1), arrayToVariable, variableNumber);
}
if (st->variant() == ASSIGN_STAT && arrayToVariable.find(st->expr(0)->unparse()) != arrayToVariable.end())
{
if (st->expr(1))
{
TransformRightPart(st, st->expr(1), arrayToVariable, variableNumber);
}
if (st->expr(0) && st->expr(0)->variant() == ARRAY_REF && CheckConstIndexes(st->expr(0)->lhs()) && arrayToVariable.find(st->expr(0)->unparse()) != arrayToVariable.end())
{
TransformLeftPart(st, st->expr(0), arrayToVariable, variableNumber);
}
}
st = st->lexPrev();
}
}
void ArrayConstantPropagation(SgProject& project)
@@ -262,40 +314,29 @@ void ArrayConstantPropagation(SgProject& project)
for (; st != lastNode; st = st->lexNext())
{
if (st->variant() == ASSIGN_STAT)
{
if (st->expr(1))
{
TransformRightPart(st, st->expr(1), arrayToVariable, variableNumber);
}
if (st->expr(0) && st->expr(0)->variant() == ARRAY_REF && CheckConstIndexes(st->expr(0)->lhs()))
{
TransformLeftPart(st, st->expr(0), arrayToVariable, variableNumber);
}
}
else if (st->variant() == FOR_NODE)
if (st->variant() == FOR_NODE)
{
SgExpression* lowerBound = st->expr(0)->lhs();
SgExpression* upperBound = st->expr(0)->rhs();
string lowerBoundUnparsed = lowerBound->unparse(), upperBoundUnparsed = upperBound->unparse();
if (upperBound->variant() == ARRAY_REF && upperBound->symbol()->type()->baseType() && CheckConstIndexes(upperBound->lhs()))
{
if (arrayToVariable.find(upperBoundUnparsed) == arrayToVariable.end())
{
arrayToVariable[upperBoundUnparsed] = CreateVar(variableNumber, upperBound->symbol()->type()->baseType());
}
TransformBorder(st, upperBound, arrayToVariable, variableNumber);
st->expr(0)->setRhs(arrayToVariable[upperBoundUnparsed]->copyPtr());
}
else if (upperBound->variant() == VAR_REF)
CheckVariable(st, upperBound, arrayToVariable, variableNumber);
if (lowerBound->variant() == ARRAY_REF && lowerBound->symbol()->type()->baseType() && CheckConstIndexes(lowerBound->lhs()))
{
if (arrayToVariable.find(lowerBoundUnparsed) == arrayToVariable.end())
{
arrayToVariable[lowerBoundUnparsed] = CreateVar(variableNumber, lowerBound->symbol()->type()->baseType());
}
TransformBorder(st, lowerBound, arrayToVariable, variableNumber);
st->expr(0)->setLhs(arrayToVariable[lowerBoundUnparsed]->copyPtr());
}
else if (lowerBound->variant() == VAR_REF)
CheckVariable(st, lowerBound, arrayToVariable, variableNumber);
}
}
cout << file->functions(i)->unparse() << endl;
}
}
}