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- /*****************************************************************************
- * Project: dcc
- * File: dataflow.c
- * Purpose: Data flow analysis module.
- * (C) Cristina Cifuentes
- ****************************************************************************/
- #include "dcc.h"
- //#include <boost/range.hpp>
- //#include <boost/range/adaptors.hpp>
- //#include <boost/range/algorithm.hpp>
- #include <string.h>
- #include <iostream>
- #include <iomanip>
- #include <stdio.h>
- //using namespace boost;
- struct ExpStack
- {
- typedef std::list<COND_EXPR *> EXP_STK;
- EXP_STK expStk; /* local expression stack */
- void init();
- void push(COND_EXPR *);
- COND_EXPR * pop();
- int numElem();
- boolT empty();
- };
- /***************************************************************************
- * Expression stack functions
- **************************************************************************/
- /* Reinitalizes the expression stack (expStk) to NULL, by freeing all the
- * space allocated (if any). */
- void ExpStack::init()
- {
- expStk.clear();
- }
- /* Pushes the given expression onto the local stack (expStk). */
- void ExpStack::push(COND_EXPR *expr)
- {
- expStk.push_back(expr);
- }
- /* Returns the element on the top of the local expression stack (expStk),
- * and deallocates the space allocated by this node.
- * If there are no elements on the stack, returns NULL. */
- COND_EXPR *ExpStack::pop()
- {
- if(expStk.empty())
- return 0;
- COND_EXPR *topExp = expStk.back();
- expStk.pop_back();
- return topExp;
- }
- /* Returns the number of elements available in the expression stack */
- int ExpStack::numElem()
- {
- return expStk.size();
- }
- /* Returns whether the expression stack is empty or not */
- boolT ExpStack::empty()
- {
- return expStk.empty();
- }
- using namespace std;
- ExpStack g_exp_stk;
- /* Returns the index of the local variable or parameter at offset off, if it
- * is in the stack frame provided. */
- int STKFRAME::getLocVar(int off)
- {
- int i;
- for (i = 0; i < sym.size(); i++)
- if (sym[i].off == off)
- break;
- return (i);
- }
- /* Returns a string with the source operand of Icode */
- static COND_EXPR *srcIdent (const LLInst &ll_insn, Function * pProc, iICODE i, ICODE & duIcode, operDu du)
- {
- if (ll_insn.testFlags(I)) /* immediate operand */
- {
- if (ll_insn.testFlags(B))
- return COND_EXPR::idKte (ll_insn.src.op(), 1);
- return COND_EXPR::idKte (ll_insn.src.op(), 2);
- }
- // otherwise
- return COND_EXPR::id (ll_insn, SRC, pProc, i, duIcode, du);
- }
- /* Returns the destination operand */
- static COND_EXPR *dstIdent (const LLInst & ll_insn, Function * pProc, iICODE i, ICODE & duIcode, operDu du)
- {
- COND_EXPR *n;
- n = COND_EXPR::id (ll_insn, DST, pProc, i, duIcode, du);
- /** Is it needed? (pIcode->ll()->flg) & NO_SRC_B **/
- return (n);
- }
- /* Eliminates all condition codes and generates new hlIcode instructions */
- void Function::elimCondCodes ()
- {
- int i;
- uint8_t use; /* Used flags bit vector */
- uint8_t def; /* Defined flags bit vector */
- boolT notSup; /* Use/def combination not supported */
- COND_EXPR *rhs; /* Source operand */
- COND_EXPR *lhs; /* Destination operand */
- COND_EXPR *exp; /* Boolean expression */
- BB * pBB; /* Pointer to BBs in dfs last ordering */
- riICODE useAt; /* Instruction that used flag */
- riICODE defAt; /* Instruction that defined flag */
- for (i = 0; i < numBBs; i++)
- {
- pBB = m_dfsLast[i];
- if (pBB->flg & INVALID_BB)
- continue; /* Do not process invalid BBs */
- // auto v(pBB | boost::adaptors::reversed);
- // for (const ICODE &useAt : v)
- // {}
- for (useAt = pBB->rbegin2(); useAt != pBB->rend2(); useAt++)
- {
- llIcode useAtOp = useAt->ll()->getOpcode();
- if ((useAt->type == LOW_LEVEL) && (useAt->valid()) && (use = useAt->ll()->flagDU.u))
- {
- /* Find definition within the same basic block */
- defAt=useAt;
- ++defAt;
- for (; defAt != pBB->rend2(); defAt++)
- {
- def = defAt->ll()->flagDU.d;
- if ((use & def) != use)
- continue;
- notSup = FALSE;
- if ((useAtOp >= iJB) && (useAtOp <= iJNS))
- {
- iICODE befDefAt = (++riICODE(defAt)).base();
- switch (defAt->ll()->getOpcode())
- {
- case iCMP:
- rhs = srcIdent (*defAt->ll(), this, befDefAt,*useAt, eUSE);
- lhs = dstIdent (*defAt->ll(), this, befDefAt,*useAt, eUSE);
- break;
- case iOR:
- lhs = defAt->hl()->asgn.lhs->clone();
- useAt->copyDU(*defAt, eUSE, eDEF);
- if (defAt->ll()->testFlags(B))
- rhs = COND_EXPR::idKte (0, 1);
- else
- rhs = COND_EXPR::idKte (0, 2);
- break;
- case iTEST:
- rhs = srcIdent (*defAt->ll(),this, befDefAt,*useAt, eUSE);
- lhs = dstIdent (*defAt->ll(),this, befDefAt,*useAt, eUSE);
- lhs = COND_EXPR::boolOp (lhs, rhs, AND);
- if (defAt->ll()->testFlags(B))
- rhs = COND_EXPR::idKte (0, 1);
- else
- rhs = COND_EXPR::idKte (0, 2);
- break;
- default:
- notSup = TRUE;
- std::cout << hex<<defAt->loc_ip;
- reportError (JX_NOT_DEF, defAt->ll()->getOpcode());
- flg |= PROC_ASM; /* generate asm */
- }
- if (! notSup)
- {
- exp = COND_EXPR::boolOp (lhs, rhs,condOpJCond[useAtOp-iJB]);
- useAt->setJCond(exp);
- }
- }
- else if (useAtOp == iJCXZ)
- {
- lhs = COND_EXPR::idReg (rCX, 0, &localId);
- useAt->setRegDU (rCX, eUSE);
- rhs = COND_EXPR::idKte (0, 2);
- exp = COND_EXPR::boolOp (lhs, rhs, EQUAL);
- useAt->setJCond(exp);
- }
- // else if (useAt->getOpcode() == iRCL)
- // {
- // }
- else
- {
- ICODE &a(*defAt);
- ICODE &b(*useAt);
- reportError (NOT_DEF_USE,a.ll()->getOpcode(),b.ll()->getOpcode());
- flg |= PROC_ASM; /* generate asm */
- }
- break;
- }
- /* Check for extended basic block */
- if ((pBB->size() == 1) &&(useAtOp >= iJB) && (useAtOp <= iJNS))
- {
- ICODE & prev(pBB->back()); /* For extended basic blocks - previous icode inst */
- if (prev.hl()->opcode == HLI_JCOND)
- {
- exp = prev.hl()->expr()->clone();
- exp->changeBoolOp (condOpJCond[useAtOp-iJB]);
- useAt->copyDU(prev, eUSE, eUSE);
- useAt->setJCond(exp);
- }
- }
- /* Error - definition not found for use of a cond code */
- else if (defAt == pBB->rend2())
- {
- reportError(DEF_NOT_FOUND,useAtOp);
- //fatalError (DEF_NOT_FOUND, Icode.getOpcode(useAt-1));
- }
- }
- }
- }
- }
- /** Generates the LiveUse() and Def() sets for each basic block in the graph.
- * Note: these sets are constant and could have been constructed during
- * the construction of the graph, but since the code hasn't been
- * analyzed yet for idioms, the procedure preamble misleads the
- * analysis (eg: push si, would include si in LiveUse; although it
- * is not really meant to be a register that is used before defined). */
- void Function::genLiveKtes ()
- {
- int i;
- BB * pbb;
- bitset<32> liveUse, def;
- for (i = 0; i < numBBs; i++)
- {
- liveUse.reset();
- def.reset();
- pbb = m_dfsLast[i];
- if (pbb->flg & INVALID_BB)
- continue; // skip invalid BBs
- for (auto j = pbb->begin2(); j != pbb->end2(); j++)
- {
- if ((j->type == HIGH_LEVEL) && (j->invalid == FALSE))
- {
- liveUse |= (j->du.use & ~def);
- def |= j->du.def;
- }
- }
- pbb->liveUse = liveUse;
- pbb->def = def;
- }
- }
- /* Generates the liveIn() and liveOut() sets for each basic block via an
- * iterative approach.
- * Propagates register usage information to the procedure call. */
- void Function::liveRegAnalysis (std::bitset<32> &in_liveOut)
- {
- int i, j;
- BB * pbb=0; /* pointer to current basic block */
- Function * pcallee; /* invoked subroutine */
- //ICODE *ticode /* icode that invokes a subroutine */
- ;
- std::bitset<32> prevLiveOut, /* previous live out */
- prevLiveIn; /* previous live in */
- boolT change; /* is there change in the live sets?*/
- /* liveOut for this procedure */
- liveOut = in_liveOut;
- change = true;
- while (change)
- {
- /* Process nodes in reverse postorder order */
- change = false;
- //for (i = numBBs; i > 0; i--)
- //boost::RandomAccessContainerConcept;
- for(auto iBB=m_dfsLast.rbegin(); iBB!=m_dfsLast.rend(); ++iBB)
- {
- pbb = *iBB;//m_dfsLast[i-1];
- if (pbb->flg & INVALID_BB) /* Do not process invalid BBs */
- continue;
- /* Get current liveIn() and liveOut() sets */
- prevLiveIn = pbb->liveIn;
- prevLiveOut = pbb->liveOut;
- /* liveOut(b) = U LiveIn(s); where s is successor(b)
- * liveOut(b) = {liveOut}; when b is a HLI_RET node */
- if (pbb->edges.empty()) /* HLI_RET node */
- {
- pbb->liveOut = in_liveOut;
- /* Get return expression of function */
- if (flg & PROC_IS_FUNC)
- {
- auto picode = pbb->rbegin2(); /* icode of function return */
- if (picode->hl()->opcode == HLI_RET)
- {
- //pbb->back().loc_ip
- picode->hl()->expr(COND_EXPR::idID (&retVal, &localId, (++pbb->rbegin2()).base()));
- picode->du.use = in_liveOut;
- }
- }
- }
- else /* Check successors */
- {
- for(TYPEADR_TYPE &e : pbb->edges)
- pbb->liveOut |= e.BBptr->liveIn;
- /* propagate to invoked procedure */
- if (pbb->nodeType == CALL_NODE)
- {
- ICODE &ticode(pbb->back());
- pcallee = ticode.hl()->call.proc;
- /* user/runtime routine */
- if (! (pcallee->flg & PROC_ISLIB))
- {
- if (pcallee->liveAnal == FALSE) /* hasn't been processed */
- pcallee->dataFlow (pbb->liveOut);
- pbb->liveOut = pcallee->liveIn;
- }
- else /* library routine */
- {
- if ( (pcallee->flg & PROC_IS_FUNC) && /* returns a value */
- (pcallee->liveOut & pbb->edges[0].BBptr->liveIn).any()
- )
- pbb->liveOut = pcallee->liveOut;
- else
- pbb->liveOut = 0;
- }
- if ((! (pcallee->flg & PROC_ISLIB)) || (pbb->liveOut != 0))
- {
- switch (pcallee->retVal.type) {
- case TYPE_LONG_SIGN: case TYPE_LONG_UNSIGN:
- ticode.du1.numRegsDef = 2;
- break;
- case TYPE_WORD_SIGN: case TYPE_WORD_UNSIGN:
- case TYPE_BYTE_SIGN: case TYPE_BYTE_UNSIGN:
- ticode.du1.numRegsDef = 1;
- break;
- default:
- fprintf(stderr,"Function::liveRegAnalysis : Unknown return type %d\n",pcallee->retVal.type);
- } /*eos*/
- /* Propagate def/use results to calling icode */
- ticode.du.use = pcallee->liveIn;
- ticode.du.def = pcallee->liveOut;
- }
- }
- }
- /* liveIn(b) = liveUse(b) U (liveOut(b) - def(b) */
- pbb->liveIn = pbb->liveUse | (pbb->liveOut & ~pbb->def);
- /* Check if live sets have been modified */
- if ((prevLiveIn != pbb->liveIn) || (prevLiveOut != pbb->liveOut))
- change = true;
- }
- }
- /* Propagate liveIn(b) to procedure header */
- if (pbb->liveIn != 0) /* uses registers */
- liveIn = pbb->liveIn;
- /* Remove any references to register variables */
- if (flg & SI_REGVAR)
- {
- liveIn &= maskDuReg[rSI];
- pbb->liveIn &= maskDuReg[rSI];
- }
- if (flg & DI_REGVAR)
- {
- liveIn &= maskDuReg[rDI];
- pbb->liveIn &= maskDuReg[rDI];
- }
- }
- void BB::genDU1()
- {
- uint8_t regi; /* Register that was defined */
- int k, defRegIdx, useIdx;
- iICODE picode, ticode,lastInst;
- BB *tbb; /* Target basic block */
- bool res;
- //COND_EXPR *e
- /* Process each register definition of a HIGH_LEVEL icode instruction.
- * Note that register variables should not be considered registers.
- */
- assert(0!=Parent);
- lastInst = this->end2();
- for (picode = this->begin2(); picode != lastInst; picode++)
- {
- if (picode->type != HIGH_LEVEL)
- continue;
- regi = 0;
- defRegIdx = 0;
- // foreach defined register
- bitset<32> processed=0;
- for (k = 0; k < INDEXBASE; k++)
- {
- if (not picode->du.def.test(k))
- continue;
- //printf("Processing reg")
- processed |= duReg[k];
- regi = (uint8_t)(k + 1); /* defined register */
- picode->du1.regi[defRegIdx] = regi;
- /* Check remaining instructions of the BB for all uses
- * of register regi, before any definitions of the
- * register */
- if ((regi == rDI) && (flg & DI_REGVAR))
- continue;
- if ((regi == rSI) && (flg & SI_REGVAR))
- continue;
- if (distance(picode,lastInst)>1) /* several instructions */
- {
- useIdx = 0;
- for (auto ricode = ++iICODE(picode); ricode != lastInst; ricode++)
- {
- ticode=ricode;
- if (ricode->type != HIGH_LEVEL) // Only check uses of HIGH_LEVEL icodes
- continue;
- /* if used, get icode index */
- if ((ricode->du.use & duReg[regi]).any())
- picode->du1.recordUse(defRegIdx,ricode);
- /* if defined, stop finding uses for this reg */
- if ((ricode->du.def & duReg[regi]).any())
- break;
- }
- /* Check if last definition of this register */
- if ((not (ticode->du.def & duReg[regi]).any()) and (this->liveOut & duReg[regi]).any())
- picode->du.lastDefRegi |= duReg[regi];
- }
- else /* only 1 instruction in this basic block */
- {
- /* Check if last definition of this register */
- if ((this->liveOut & duReg[regi]).any())
- picode->du.lastDefRegi |= duReg[regi];
- }
- /* Find target icode for HLI_CALL icodes to procedures
- * that are functions. The target icode is in the
- * next basic block (unoptimized code) or somewhere else
- * on optimized code. */
- if ((picode->hl()->opcode == HLI_CALL) &&
- (picode->hl()->call.proc->flg & PROC_IS_FUNC))
- {
- tbb = this->edges[0].BBptr;
- for (ticode = tbb->begin2(); ticode != tbb->end2(); ticode++)
- {
- if (ticode->type != HIGH_LEVEL)
- continue;
- /* if used, get icode index */
- if ((ticode->du.use & duReg[regi]).any())
- picode->du1.recordUse(defRegIdx,ticode);
- /* if defined, stop finding uses for this reg */
- if ((ticode->du.def & duReg[regi]).any())
- break;
- }
- /* if not used in this basic block, check if the
- * register is live out, if so, make it the last
- * definition of this register */
- if ( picode->du1.used(defRegIdx) && (tbb->liveOut & duReg[regi]).any())
- picode->du.lastDefRegi |= duReg[regi];
- }
- /* If not used within this bb or in successors of this
- * bb (ie. not in liveOut), then register is useless,
- * thus remove it. Also check that this is not a return
- * from a library function (routines such as printf
- * return an integer, which is normally not taken into
- * account by the programmer). */
- if (picode->valid() and not picode->du1.used(defRegIdx) and
- (not (picode->du.lastDefRegi & duReg[regi]).any()) &&
- (not ((picode->hl()->opcode == HLI_CALL) &&
- (picode->hl()->call.proc->flg & PROC_ISLIB))))
- {
- if (! (this->liveOut & duReg[regi]).any()) /* not liveOut */
- {
- res = picode->removeDefRegi (regi, defRegIdx+1,&Parent->localId);
- if (res != true)
- {
- defRegIdx++;
- continue;
- }
- /* Backpatch any uses of this instruction, within
- * the same BB, if the instruction was invalidated */
- for (auto ticode = riICODE(picode); ticode != this->rend2(); ticode++)
- {
- ticode->du1.remove(0,picode);
- }
- }
- else /* liveOut */
- picode->du.lastDefRegi |= duReg[regi];
- }
- defRegIdx++;
- /* Check if all defined registers have been processed */
- if ((defRegIdx >= picode->du1.numRegsDef) || (defRegIdx == MAX_REGS_DEF))
- break;
- }
- }
- }
- /* Generates the du chain of each instruction in a basic block */
- void Function::genDU1 ()
- {
- uint8_t regi; /* Register that was defined */
- int i, k, defRegIdx, useIdx;
- iICODE picode, ticode,lastInst;/* Current and target bb */
- BB * pbb, *tbb; /* Current and target basic block */
- bool res;
- //COND_EXPR *exp, *lhs;
- /* Traverse tree in dfsLast order */
- assert(m_dfsLast.size()==numBBs);
- for(BB *pbb : m_dfsLast)
- {
- if (pbb->flg & INVALID_BB)
- continue;
- pbb->genDU1();
- }
- }
- /* Substitutes the rhs (or lhs if rhs not possible) of ticode for the rhs
- * of picode. */
- static void forwardSubs (COND_EXPR *lhs, COND_EXPR *rhs, iICODE picode,
- iICODE ticode, LOCAL_ID *locsym, int &numHlIcodes)
- {
- boolT res;
- if (rhs == NULL) /* In case expression popped is NULL */
- return;
- /* Insert on rhs of ticode, if possible */
- res = COND_EXPR::insertSubTreeReg (ticode->hl()->asgn.rhs,rhs,
- locsym->id_arr[lhs->expr.ident.idNode.regiIdx].id.regi,
- locsym);
- if (res)
- {
- picode->invalidate();
- numHlIcodes--;
- }
- else
- {
- /* Try to insert it on lhs of ticode*/
- res = COND_EXPR::insertSubTreeReg (ticode->hl()->asgn.lhs,rhs,
- locsym->id_arr[lhs->expr.ident.idNode.regiIdx].id.regi,
- locsym);
- if (res)
- {
- picode->invalidate();
- numHlIcodes--;
- }
- }
- }
- /* Substitutes the rhs (or lhs if rhs not possible) of ticode for the
- * expression exp given */
- static void forwardSubsLong (int longIdx, COND_EXPR *exp, iICODE picode,
- iICODE ticode, int *numHlIcodes)
- {
- bool res;
- if (exp == NULL) /* In case expression popped is NULL */
- return;
- /* Insert on rhs of ticode, if possible */
- res = COND_EXPR::insertSubTreeLongReg (exp, &ticode->hl()->asgn.rhs, longIdx);
- if (res)
- {
- picode->invalidate();
- (*numHlIcodes)--;
- }
- else
- {
- /* Try to insert it on lhs of ticode*/
- res = COND_EXPR::insertSubTreeLongReg (exp, &ticode->hl()->asgn.lhs, longIdx);
- if (res)
- {
- picode->invalidate();
- (*numHlIcodes)--;
- }
- }
- }
- /* Returns whether the elements of the expression rhs are all x-clear from
- * instruction f up to instruction t. */
- bool COND_EXPR::xClear (iICODE f, iICODE t, iICODE lastBBinst, Function * pproc)
- {
- iICODE i;
- boolT res;
- uint8_t regi;
- switch (type)
- {
- case IDENTIFIER:
- if (expr.ident.idType == REGISTER)
- {
- regi= pproc->localId.id_arr[expr.ident.idNode.regiIdx].id.regi;
- for (i = ++iICODE(f); (i != lastBBinst) && (i!=t); i++)
- if ((i->type == HIGH_LEVEL) && ( not i->invalid ))
- {
- if ((i->du.def & duReg[regi]).any())
- return false;
- }
- if (i != lastBBinst)
- return true;
- return false;
- }
- else
- return true;
- /* else if (rhs->expr.ident.idType == LONG_VAR)
- {
- missing all other identifiers ****
- } */
- case BOOLEAN_OP:
- if(0==rhs())
- return false;
- res = rhs()->xClear ( f, t, lastBBinst, pproc);
- if (res == FALSE)
- return false;
- if(0==lhs())
- return false;
- return lhs()->xClear ( f, t, lastBBinst, pproc);
- case NEGATION:
- case ADDRESSOF:
- case DEREFERENCE:
- if(0==expr.unaryExp)
- return false;
- return expr.unaryExp->xClear ( f, t, lastBBinst, pproc);
- } /* eos */
- return false;
- }
- bool UnaryOperator::xClear(iICODE f, iICODE t, iICODE lastBBinst, Function *pproc)
- {
- if(0==unaryExp)
- return false;
- return unaryExp->xClear ( f, t, lastBBinst, pproc);
- }
- bool BinaryOperator::xClear(iICODE f, iICODE t, iICODE lastBBinst, Function *pproc)
- {
- if(0==m_rhs)
- return false;
- if ( not m_rhs->xClear (f, t, lastBBinst, pproc) )
- return false;
- if(0==m_lhs)
- return false;
- return m_lhs->xClear (f, t, lastBBinst, pproc);
- }
- /* Checks the type of the formal argument as against to the actual argument,
- * whenever possible, and then places the actual argument on the procedure's
- * argument list. */
- static void processCArg (Function * pp, Function * pProc, ICODE * picode, int numArgs, int *k)
- {
- COND_EXPR *exp;
- boolT res;
- /* if (numArgs == 0)
- return; */
- exp = g_exp_stk.pop();
- if (pp->flg & PROC_ISLIB) /* library function */
- {
- if (pp->args.numArgs > 0)
- if (pp->flg & PROC_VARARG)
- {
- if (numArgs < pp->args.sym.size())
- adjustActArgType (exp, pp->args.sym[numArgs].type, pProc);
- }
- else
- adjustActArgType (exp, pp->args.sym[numArgs].type, pProc);
- res = picode->newStkArg (exp, picode->ll()->getOpcode(), pProc);
- }
- else /* user function */
- {
- if (pp->args.numArgs > 0)
- pp->args.adjustForArgType (numArgs, expType (exp, pProc));
- res = picode->newStkArg (exp, picode->ll()->getOpcode(), pProc);
- }
- /* Do not update the size of k if the expression was a segment register
- * in a near call */
- if (res == FALSE)
- *k += hlTypeSize (exp, pProc);
- }
- /** Eliminates extraneous intermediate icode instructions when finding
- * expressions. Generates new hlIcodes in the form of expression trees.
- * For HLI_CALL hlIcodes, places the arguments in the argument list. */
- void Function::processTargetIcode(iICODE picode, int &numHlIcodes, iICODE ticode,bool isLong)
- {
- boolT res;
- switch (ticode->hl()->opcode) {
- case HLI_ASSIGN:
- if(isLong)
- {
- forwardSubsLong (picode->hl()->asgn.lhs->expr.ident.idNode.longIdx,
- picode->hl()->asgn.rhs, picode,ticode,
- &numHlIcodes);
- }
- else
- forwardSubs (picode->hl()->asgn.lhs, picode->hl()->asgn.rhs,
- picode, ticode, &localId, numHlIcodes);
- break;
- case HLI_JCOND: case HLI_PUSH: case HLI_RET:
- if(isLong)
- {
- res = COND_EXPR::insertSubTreeLongReg (
- picode->hl()->asgn.rhs,
- &ticode->hl()->exp.v,
- picode->hl()->asgn.lhs->expr.ident.idNode.longIdx);
- }
- else
- {
- res = COND_EXPR::insertSubTreeReg (
- ticode->hl()->exp.v,
- picode->hl()->asgn.rhs,
- localId.id_arr[picode->hl()->asgn.lhs->expr.ident.idNode.regiIdx].id.regi,
- &localId);
- }
- if (res)
- {
- picode->invalidate();
- numHlIcodes--;
- }
- break;
- case HLI_CALL: /* register arguments */
- newRegArg ( picode, ticode);
- picode->invalidate();
- numHlIcodes--;
- break;
- }
- }
- void Function::processHliCall1(COND_EXPR *exp, iICODE picode)
- {
- Function * pp;
- int cb, numArgs;
- boolT res;
- int k;
- pp = picode->hl()->call.proc;
- if (pp->flg & CALL_PASCAL)
- {
- cb = pp->cbParam; /* fixed # arguments */
- for (k = 0, numArgs = 0; k < cb; numArgs++)
- {
- exp = g_exp_stk.pop();
- if (pp->flg & PROC_ISLIB) /* library function */
- {
- if (pp->args.numArgs > 0)
- adjustActArgType(exp, pp->args.sym[numArgs].type, this);
- res = picode->newStkArg (exp, picode->ll()->getOpcode(), this);
- }
- else /* user function */
- {
- if (pp->args.numArgs >0)
- pp->args.adjustForArgType (numArgs,expType (exp, this));
- res = picode->newStkArg (exp,picode->ll()->getOpcode(), this);
- }
- if (res == FALSE)
- k += hlTypeSize (exp, this);
- }
- }
- else /* CALL_C */
- {
- cb = picode->hl()->call.args->cb;
- numArgs = 0;
- if (cb)
- for (k = 0; k < cb; numArgs++)
- processCArg (pp, this, &(*picode), numArgs, &k);
- else if ((cb == 0) && picode->ll()->testFlags(REST_STK))
- while (! g_exp_stk.empty())
- {
- processCArg (pp, this, &(*picode), numArgs, &k);
- numArgs++;
- }
- }
- }
- void Function::findExps()
- {
- int i, numHlIcodes;
- iICODE lastInst,
- picode, // Current icode */
- ticode; // Target icode */
- BB * pbb; // Current and next basic block */
- boolT res;
- COND_EXPR *exp, // expression pointer - for HLI_POP and HLI_CALL */
- *lhs; // exp ptr for return value of a HLI_CALL */
- //STKFRAME * args; // pointer to arguments - for HLI_CALL */
- uint8_t regi; // register(s) to be forward substituted */
- ID *retVal; // function return value
- /* Initialize expression stack */
- g_exp_stk.init();
- /* Traverse tree in dfsLast order */
- for (i = 0; i < numBBs; i++)
- {
- /* Process one BB */
- pbb = m_dfsLast[i];
- if (pbb->flg & INVALID_BB)
- continue;
- lastInst = pbb->end2();
- numHlIcodes = 0;
- for (picode = pbb->begin2(); picode != lastInst; picode++)
- {
- if ((picode->type == HIGH_LEVEL) && (picode->invalid == FALSE))
- {
- numHlIcodes++;
- if (picode->du1.numRegsDef == 1) /* uint8_t/uint16_t regs */
- {
- /* Check for only one use of this register. If this is
- * the last definition of the register in this BB, check
- * that it is not liveOut from this basic block */
- if (picode->du1.numUses(0)==1)
- {
- /* Check that this register is not liveOut, if it
- * is the last definition of the register */
- regi = picode->du1.regi[0];
- /* Check if we can forward substitute this register */
- switch (picode->hl()->opcode)
- {
- case HLI_ASSIGN:
- /* Replace rhs of current icode into target
- * icode expression */
- ticode = picode->du1.idx[0].uses.front();
- if ((picode->du.lastDefRegi & duReg[regi]).any() &&
- ((ticode->hl()->opcode != HLI_CALL) &&
- (ticode->hl()->opcode != HLI_RET)))
- continue;
- if (picode->hl()->asgn.rhs->xClear (picode,
- picode->du1.idx[0].uses[0], lastInst, this))
- {
- processTargetIcode(picode, numHlIcodes, ticode,false);
- }
- break;
- case HLI_POP:
- ticode = picode->du1.idx[0].uses.front();
- if ((picode->du.lastDefRegi & duReg[regi]).any() &&
- ((ticode->hl()->opcode != HLI_CALL) &&
- (ticode->hl()->opcode != HLI_RET)))
- continue;
- exp = g_exp_stk.pop(); /* pop last exp pushed */
- switch (ticode->hl()->opcode) {
- case HLI_ASSIGN:
- forwardSubs (picode->hl()->expr(), exp,
- picode, ticode, &localId,
- numHlIcodes);
- break;
- case HLI_JCOND: case HLI_PUSH: case HLI_RET:
- res = COND_EXPR::insertSubTreeReg (ticode->hl()->exp.v,
- exp,
- localId.id_arr[picode->hl()->expr()->expr.ident.idNode.regiIdx].id.regi,
- &localId);
- if (res)
- {
- picode->invalidate();
- numHlIcodes--;
- }
- break;
- /****case HLI_CALL: /* register arguments
- newRegArg (pProc, picode, ticode);
- picode->invalidate();
- numHlIcodes--;
- break; */
- } /* eos */
- break;
- case HLI_CALL:
- ticode = picode->du1.idx[0].uses.front();
- switch (ticode->hl()->opcode) {
- case HLI_ASSIGN:
- exp = COND_EXPR::idFunc (
- picode->hl()->call.proc,
- picode->hl()->call.args);
- res = COND_EXPR::insertSubTreeReg (ticode->hl()->asgn.rhs,
- exp,
- picode->hl()->call.proc->retVal.id.regi,
- &localId);
- if (! res)
- COND_EXPR::insertSubTreeReg (ticode->hl()->asgn.lhs,
- exp,
- picode->hl()->call.proc->retVal.id.regi,
- &localId);
- /*** TODO: HERE missing: 2 regs ****/
- picode->invalidate();
- numHlIcodes--;
- break;
- case HLI_PUSH: case HLI_RET:
- ticode->hl()->expr( COND_EXPR::idFunc ( picode->hl()->call.proc, picode->hl()->call.args) );
- picode->invalidate();
- numHlIcodes--;
- break;
- case HLI_JCOND:
- exp = COND_EXPR::idFunc ( picode->hl()->call.proc, picode->hl()->call.args);
- retVal = &picode->hl()->call.proc->retVal,
- res = COND_EXPR::insertSubTreeReg (ticode->hl()->exp.v,
- exp,
- retVal->id.regi, &localId);
- if (res) /* was substituted */
- {
- picode->invalidate();
- numHlIcodes--;
- }
- else /* cannot substitute function */
- {
- //picode->loc_ip
- lhs = COND_EXPR::idID(retVal,&localId,picode);
- picode->setAsgn(lhs, exp);
- }
- break;
- } /* eos */
- break;
- } /* eos */
- }
- }
- else if (picode->du1.numRegsDef == 2) /* long regs */
- {
- /* Check for only one use of these registers */
- if ((picode->du1.numUses(0) == 1) and (picode->du1.numUses(1) == 1))
- {
- switch (picode->hl()->opcode) {
- case HLI_ASSIGN:
- /* Replace rhs of current icode into target
- * icode expression */
- if (picode->du1.idx[0].uses[0] == picode->du1.idx[1].uses[0])
- {
- ticode = picode->du1.idx[0].uses.front();
- if ((picode->du.lastDefRegi & duReg[regi]).any() &&
- ((ticode->hl()->opcode != HLI_CALL) &&
- (ticode->hl()->opcode != HLI_RET)))
- continue;
- processTargetIcode(picode, numHlIcodes, ticode,true);
- }
- break;
- case HLI_POP:
- if (picode->du1.idx[0].uses[0] == picode->du1.idx[1].uses[0])
- {
- ticode = picode->du1.idx[0].uses.front();
- if ((picode->du.lastDefRegi & duReg[regi]).any() &&
- ((ticode->hl()->opcode != HLI_CALL) &&
- (ticode->hl()->opcode != HLI_RET)))
- continue;
- exp = g_exp_stk.pop(); /* pop last exp pushed */
- switch (ticode->hl()->opcode) {
- case HLI_ASSIGN:
- forwardSubsLong (picode->hl()->expr()->expr.ident.idNode.longIdx,
- exp, picode, ticode, &numHlIcodes);
- break;
- case HLI_JCOND: case HLI_PUSH:
- res = COND_EXPR::insertSubTreeLongReg (exp,
- &ticode->hl()->exp.v,
- picode->hl()->asgn.lhs->expr.ident.idNode.longIdx);
- if (res)
- {
- picode->invalidate();
- numHlIcodes--;
- }
- break;
- case HLI_CALL: /*** missing ***/
- break;
- } /* eos */
- }
- break;
- case HLI_CALL: /* check for function return */
- ticode = picode->du1.idx[0].uses.front();
- switch (ticode->hl()->opcode)
- {
- case HLI_ASSIGN:
- exp = COND_EXPR::idFunc ( picode->hl()->call.proc, picode->hl()->call.args);
- ticode->hl()->asgn.lhs =
- COND_EXPR::idLong(&localId, DST, ticode,HIGH_FIRST, picode, eDEF, ++iICODE(ticode));
- ticode->hl()->asgn.rhs = exp;
- picode->invalidate();
- numHlIcodes--;
- break;
- case HLI_PUSH: case HLI_RET:
- ticode->hl()->expr( COND_EXPR::idFunc ( picode->hl()->call.proc, picode->hl()->call.args) );
- picode->invalidate();
- numHlIcodes--;
- break;
- case HLI_JCOND:
- exp = COND_EXPR::idFunc ( picode->hl()->call.proc, picode->hl()->call.args);
- retVal = &picode->hl()->call.proc->retVal;
- res = COND_EXPR::insertSubTreeLongReg (exp,
- &ticode->hl()->exp.v,
- localId.newLongReg ( retVal->type, retVal->id.longId.h,
- retVal->id.longId.l, picode));
- if (res) /* was substituted */
- {
- picode->invalidate();
- numHlIcodes--;
- }
- else /* cannot substitute function */
- {
- lhs = COND_EXPR::idID(retVal,&localId,picode/*picode->loc_ip*/);
- picode->setAsgn(lhs, exp);
- }
- break;
- } /* eos */
- } /* eos */
- }
- }
- /* HLI_PUSH doesn't define any registers, only uses registers.
- * Push the associated expression to the register on the local
- * expression stack */
- else if (picode->hl()->opcode == HLI_PUSH)
- {
- g_exp_stk.push(picode->hl()->expr());
- picode->invalidate();
- numHlIcodes--;
- }
- /* For HLI_CALL instructions that use arguments from the stack,
- * pop them from the expression stack and place them on the
- * procedure's argument list */
- if ((picode->hl()->opcode == HLI_CALL) && ! (picode->hl()->call.proc->flg & REG_ARGS))
- {
- processHliCall1(exp, picode);
- }
- /* If we could not substitute the result of a function,
- * assign it to the corresponding registers */
- if ((picode->hl()->opcode == HLI_CALL) &&
- ((picode->hl()->call.proc->flg & PROC_ISLIB) !=
- PROC_ISLIB) && (not picode->du1.used(0)) &&
- (picode->du1.numRegsDef > 0))
- {
- exp = COND_EXPR::idFunc (picode->hl()->call.proc, picode->hl()->call.args);
- lhs = COND_EXPR::idID (&picode->hl()->call.proc->retVal, &localId, picode);
- picode->setAsgn(lhs, exp);
- }
- }
- }
- /* Store number of high-level icodes in current basic block */
- pbb->numHlIcodes = numHlIcodes;
- }
- }
- /** Invokes procedures related with data flow analysis. Works on a procedure
- * at a time basis.
- * Note: indirect recursion in liveRegAnalysis is possible. */
- void Function::dataFlow(std::bitset<32> &liveOut)
- {
- boolT isAx, isBx, isCx, isDx;
- int idx;
- /* Remove references to register variables */
- if (flg & SI_REGVAR)
- liveOut &= maskDuReg[rSI];
- if (flg & DI_REGVAR)
- liveOut &= maskDuReg[rDI];
- /* Function - return value register(s) */
- if (liveOut != 0)
- {
- flg |= PROC_IS_FUNC;
- isAx = liveOut.test(rAX - rAX);
- isBx = liveOut.test(rBX - rAX);
- isCx = liveOut.test(rCX - rAX);
- isDx = liveOut.test(rDX - rAX);
- if (isAx && isDx) /* long or pointer */
- {
- retVal.type = TYPE_LONG_SIGN;
- retVal.loc = REG_FRAME;
- retVal.id.longId.h = rDX;
- retVal.id.longId.l = rAX;
- idx = localId.newLongReg(TYPE_LONG_SIGN, rDX, rAX, Icode.begin()/*0*/);
- localId.propLongId (rAX, rDX, "\0");
- }
- else if (isAx || isBx || isCx || isDx) /* uint16_t */
- {
- retVal.type = TYPE_WORD_SIGN;
- retVal.loc = REG_FRAME;
- if (isAx)
- retVal.id.regi = rAX;
- else if (isBx)
- retVal.id.regi = rBX;
- else if (isCx)
- retVal.id.regi = rCX;
- else
- retVal.id.regi = rDX;
- idx = localId.newByteWordReg(TYPE_WORD_SIGN,retVal.id.regi);
- }
- }
- /* Data flow analysis */
- liveAnal = TRUE;
- elimCondCodes();
- genLiveKtes();
- liveRegAnalysis (liveOut); /* calls dataFlow() recursively */
- if (! (flg & PROC_ASM)) /* can generate C for pProc */
- {
- genDU1 (); /* generate def/use level 1 chain */
- findExps (); /* forward substitution algorithm */
- }
- }
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