342 lines
12 KiB
C++
342 lines
12 KiB
C++
#include "propagation.h"
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#include "../Utils/SgUtils.h"
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#include <iostream>
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#include <unordered_map>
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#include <unordered_set>
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#include <vector>
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using namespace std;
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static SgStatement* declPlace = NULL;
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static unordered_set<SgStatement*> changed;;
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static bool CheckConstIndexes(SgExpression* exp)
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{
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if (!exp)
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{
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return true;
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}
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SgExpression* lhs = exp->lhs();
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SgExpression* rhs = exp->rhs();
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do
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{
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if (lhs->variant() != INT_VAL)
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{
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return false;
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}
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if (rhs)
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{
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lhs = rhs->lhs();
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rhs = rhs->rhs();
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}
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} while (rhs);
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return true;
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}
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static SgExpression* CreateVar(int& variableNumber, SgType* type)
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{
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string varName = "tmp_prop_var";
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string name = varName + std::to_string(variableNumber) + "__";
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variableNumber++;
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SgSymbol* varSymbol = new SgSymbol(VARIABLE_NAME, name.c_str(), *type, *declPlace->controlParent());
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const string commonBlockName = "propagation_common__";
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SgStatement* funcStart = declPlace->controlParent();
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SgStatement* commonStat = NULL;
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SgExpression* commonList = NULL;
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SgStatement* funcEnd = funcStart->lastNodeOfStmt();
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SgStatement* current = funcStart->lexNext();
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while (current != funcEnd && current)
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{
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if (current->variant() == COMM_STAT)
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{
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for (SgExpression* exp = current->expr(0); exp; exp = exp->rhs())
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{
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if (exp->variant() == COMM_LIST)
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{
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string existingName = exp->symbol() ?
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string(exp->symbol()->identifier()) :
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string("spf_unnamed");
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if (existingName == commonBlockName)
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{
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commonStat = current;
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commonList = exp;
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break;
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}
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}
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}
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if (commonStat)
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break;
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}
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current = current->lexNext();
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}
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vector<SgExpression*> varRefs;
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if (commonList)
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{
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SgExpression* varList = commonList->lhs();
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if (varList)
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{
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auto extractSymbol = [](SgExpression* exp) -> SgSymbol* {
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if (!exp)
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return NULL;
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if (exp->symbol())
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return exp->symbol();
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if (exp->lhs() && exp->lhs()->symbol())
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return exp->lhs()->symbol();
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return NULL;
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};
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if (varList->variant() == EXPR_LIST)
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{
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for (SgExpression* exp = varList; exp; exp = exp->rhs())
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{
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SgExpression* varExp = exp->lhs();
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SgSymbol* sym = extractSymbol(varExp);
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if (sym)
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{
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varRefs.push_back(new SgVarRefExp(sym));
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}
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}
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}
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else
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{
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for (SgExpression* varExp = varList; varExp; varExp = varExp->rhs())
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{
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SgSymbol* sym = extractSymbol(varExp);
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if (sym)
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{
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varRefs.push_back(new SgVarRefExp(sym));
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}
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}
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}
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}
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}
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if (!commonList)
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{
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current = funcStart->lexNext();
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while (current != funcEnd && current)
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{
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if (current->variant() == COMM_STAT)
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{
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commonStat = current;
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break;
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}
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current = current->lexNext();
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}
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SgSymbol* commonSymbol = new SgSymbol(COMMON_NAME, commonBlockName.c_str());
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commonList = new SgExpression(COMM_LIST, NULL, NULL, commonSymbol);
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if (commonStat)
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{
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SgExpression* lastCommList = commonStat->expr(0);
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if (lastCommList)
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{
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while (lastCommList->rhs())
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lastCommList = lastCommList->rhs();
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lastCommList->setRhs(commonList);
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}
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else
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{
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commonStat->setExpression(0, commonList);
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}
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}
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else
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{
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commonStat = new SgStatement(COMM_STAT);
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commonStat->setFileName(declPlace->fileName());
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commonStat->setFileId(declPlace->getFileId());
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commonStat->setProject(declPlace->getProject());
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commonStat->setlineNumber(getNextNegativeLineNumber());
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commonStat->setExpression(0, commonList);
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declPlace->insertStmtBefore(*commonStat, *declPlace->controlParent());
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}
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}
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varRefs.push_back(new SgVarRefExp(varSymbol));
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if (varRefs.size() > 0)
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{
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std::reverse(varRefs.begin(), varRefs.end());
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SgExpression* varList = makeExprList(varRefs, false);
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commonList->setLhs(varList);
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}
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return new SgExpression(VAR_REF, NULL, NULL, varSymbol, type->copyPtr());
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}
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static void TransformRightPart(SgStatement* st, SgExpression* exp, unordered_map<string, SgExpression*>& arrayToVariable, int& variableNumber)
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{
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if (!exp)
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{
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return;
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}
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vector<SgExpression*> subnodes = { exp->lhs(), exp->rhs() };
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string expUnparsed;
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SgExpression* toAdd = NULL;
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if (exp->variant() == ARRAY_REF && CheckConstIndexes(exp->lhs()))
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{
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cout << st->unparse() << endl;
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if (arrayToVariable.find(expUnparsed) == arrayToVariable.end() && exp->symbol()->type()->baseType())
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{
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arrayToVariable[expUnparsed] = CreateVar(variableNumber, exp->symbol()->type()->baseType());
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}
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st->setExpression(1, arrayToVariable[expUnparsed]->copyPtr());
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return;
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}
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for (int i = 0; i < 2; i++)
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{
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if (subnodes[i] && subnodes[i]->variant() == ARRAY_REF && subnodes[i]->symbol()->type()->baseType() && CheckConstIndexes(subnodes[i]->lhs()))
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{
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expUnparsed = subnodes[i]->unparse();
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if (arrayToVariable.find(expUnparsed) == arrayToVariable.end())
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{
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arrayToVariable[expUnparsed] = CreateVar(variableNumber, subnodes[i]->symbol()->type()->baseType());;
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}
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toAdd = arrayToVariable[expUnparsed]->copyPtr();
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if (toAdd)
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{
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if (i == 0)
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{
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exp->setLhs(toAdd);
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}
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else
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{
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exp->setRhs(toAdd);
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}
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}
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}
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else
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{
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TransformRightPart(st, subnodes[i], arrayToVariable, variableNumber);
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}
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}
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}
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static void TransformLeftPart(SgStatement* st, SgExpression* exp, unordered_map<string, SgExpression*>& arrayToVariable, int& variableNumber)
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{
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if (exp->symbol()->type()->variant() == T_STRING)
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return;
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if (changed.find(st) != changed.end())
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return;
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string expUnparsed = exp->unparse();
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if (arrayToVariable.find(expUnparsed) == arrayToVariable.end() && exp->symbol()->type()->baseType())
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{
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arrayToVariable[expUnparsed] = CreateVar(variableNumber, exp->symbol()->type()->baseType());
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}
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SgStatement* newStatement = new SgStatement(ASSIGN_STAT, NULL, NULL, arrayToVariable[expUnparsed]->copyPtr(), st->expr(1)->copyPtr(), NULL);
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newStatement->setFileId(st->getFileId());
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newStatement->setProject(st->getProject());
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newStatement->setlineNumber(getNextNegativeLineNumber());
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newStatement->setLocalLineNumber(st->lineNumber());
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st->insertStmtBefore(*newStatement, *st->controlParent());
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changed.insert(st);
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}
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static void TransformBorder(SgStatement* st, SgExpression* exp, unordered_map<string, SgExpression*>& arrayToVariable, int& variableNumber)
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{
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SgStatement* firstStatement = declPlace->lexPrev();
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st = st->lexPrev();
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string array = exp->unparse();
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arrayToVariable[array] = CreateVar(variableNumber, exp->symbol()->type()->baseType());
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while (st != firstStatement)
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{
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if (st->variant() == ASSIGN_STAT && arrayToVariable.find(st->expr(0)->unparse()) != arrayToVariable.end())
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{
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if (st->expr(1))
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{
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TransformRightPart(st, st->expr(1), arrayToVariable, variableNumber);
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}
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if (st->expr(0) && st->expr(0)->variant() == ARRAY_REF && CheckConstIndexes(st->expr(0)->lhs()) && arrayToVariable.find(st->expr(0)->unparse()) != arrayToVariable.end())
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{
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TransformLeftPart(st, st->expr(0), arrayToVariable, variableNumber);
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}
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}
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st = st->lexPrev();
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}
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}
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static void CheckVariable(SgStatement* st, SgExpression* exp, unordered_map<string, SgExpression*>& arrayToVariable, int& variableNumber)
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{
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SgStatement* firstStatement = declPlace->lexPrev();
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st = st->lexPrev();
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string varName = exp->unparse();
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while (st != firstStatement)
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{
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if (st->variant() == ASSIGN_STAT && st->expr(0)->symbol() == exp->symbol())
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{
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TransformRightPart(st, st->expr(1), arrayToVariable, variableNumber);
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}
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if (st->variant() == ASSIGN_STAT && arrayToVariable.find(st->expr(0)->unparse()) != arrayToVariable.end())
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{
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if (st->expr(1))
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{
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TransformRightPart(st, st->expr(1), arrayToVariable, variableNumber);
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}
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if (st->expr(0) && st->expr(0)->variant() == ARRAY_REF && CheckConstIndexes(st->expr(0)->lhs()) && arrayToVariable.find(st->expr(0)->unparse()) != arrayToVariable.end())
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{
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TransformLeftPart(st, st->expr(0), arrayToVariable, variableNumber);
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}
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}
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st = st->lexPrev();
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}
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}
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void ArrayConstantPropagation(SgProject& project)
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{
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unordered_map<string, SgExpression*> arrayToVariable;
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int variableNumber = 0;
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for (int i = 0; i < project.numberOfFiles(); i++)
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{
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SgFile* file = &(project.file(i));
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if (!file)
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continue;
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const int funcNum = file->numberOfFunctions();
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for (int i = 0; i < funcNum; ++i)
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{
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SgStatement* st = file->functions(i);
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declPlace = st->lexNext();
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SgStatement* lastNode = st->lastNodeOfStmt();
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for (; st != lastNode; st = st->lexNext())
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{
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if (st->variant() == FOR_NODE)
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{
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SgExpression* lowerBound = st->expr(0)->lhs();
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SgExpression* upperBound = st->expr(0)->rhs();
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string lowerBoundUnparsed = lowerBound->unparse(), upperBoundUnparsed = upperBound->unparse();
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if (upperBound->variant() == ARRAY_REF && upperBound->symbol()->type()->baseType() && CheckConstIndexes(upperBound->lhs()))
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{
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TransformBorder(st, upperBound, arrayToVariable, variableNumber);
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st->expr(0)->setRhs(arrayToVariable[upperBoundUnparsed]->copyPtr());
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}
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else if (upperBound->variant() == VAR_REF)
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CheckVariable(st, upperBound, arrayToVariable, variableNumber);
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if (lowerBound->variant() == ARRAY_REF && lowerBound->symbol()->type()->baseType() && CheckConstIndexes(lowerBound->lhs()))
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{
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TransformBorder(st, lowerBound, arrayToVariable, variableNumber);
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st->expr(0)->setLhs(arrayToVariable[lowerBoundUnparsed]->copyPtr());
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}
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else if (lowerBound->variant() == VAR_REF)
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CheckVariable(st, lowerBound, arrayToVariable, variableNumber);
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}
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}
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cout << file->functions(i)->unparse() << endl;
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}
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}
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} |