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- /*
- * File: procs.c
- * Purpose: Functions to support Call graphs and procedures
- * Date: November 1993
- * (C) Cristina Cifuentes
- */
- #include <cstring>
- #include <cassert>
- #include "dcc.h"
- #include "project.h"
- extern Project g_proj;
- /* Static indentation buffer */
- static constexpr int indSize=81; /* size of indentation buffer; max 20 */
- static char indentBuf[indSize] =
- " ";
- // not static, used in icode.cpp at emitGotoLabel
- const char *indentStr(int indLevel) // Indentation according to the depth of the statement
- {
- return (&indentBuf[indSize-(indLevel*4)-1]);
- }
- /* Inserts an outEdge at the current callGraph pointer if the newProc does
- * not exist. */
- void CALL_GRAPH::insertArc (ilFunction newProc)
- {
- CALL_GRAPH *pcg;
- /* Check if procedure already exists */
- auto res=std::find_if(outEdges.begin(),outEdges.end(),[newProc](CALL_GRAPH *e) {return e->proc==newProc;});
- if(res!=outEdges.end())
- return;
- /* Include new arc */
- pcg = new CALL_GRAPH;
- pcg->proc = newProc;
- outEdges.push_back(pcg);
- }
- /* Inserts a (caller, callee) arc in the call graph tree. */
- bool CALL_GRAPH::insertCallGraph(ilFunction caller, ilFunction callee)
- {
- int i;
- if (proc == caller)
- {
- insertArc (callee);
- return true;
- }
- else
- {
- for (i = 0; i < outEdges.size(); i++)
- if (outEdges[i]->insertCallGraph (caller, callee))
- return true;
- return (false);
- }
- }
- bool CALL_GRAPH::insertCallGraph(Function *caller, ilFunction callee)
- {
- return insertCallGraph(g_proj.funcIter(caller),callee);
- }
- /* Displays the current node of the call graph, and invokes recursively on
- * the nodes the procedure invokes. */
- void CALL_GRAPH::writeNodeCallGraph(int indIdx)
- {
- int i;
- printf ("%s%s\n", indentStr(indIdx), proc->name.c_str());
- for (i = 0; i < outEdges.size(); i++)
- outEdges[i]->writeNodeCallGraph (indIdx + 1);
- }
- /* Writes the header and invokes recursive procedure */
- void CALL_GRAPH::write()
- {
- printf ("\nCall Graph:\n");
- writeNodeCallGraph (0);
- }
- /**************************************************************************
- * Routines to support arguments
- *************************************************************************/
- /* Updates the argument table by including the register(s) (ie. lhs of
- * picode) and the actual expression (ie. rhs of picode).
- * Note: register(s) are only included once in the table. */
- void LOCAL_ID::newRegArg(iICODE picode, iICODE ticode) const
- {
- COND_EXPR *lhs;
- STKFRAME * call_args_stackframe, *target_stackframe;
- const ID *id;
- int tidx;
- boolT regExist;
- condId type;
- Function * tproc;
- eReg regL, regH; /* Registers involved in arguments */
- /* Flag ticode as having register arguments */
- tproc = ticode->hl()->call.proc;
- tproc->flg |= REG_ARGS;
- /* Get registers and index into target procedure's local list */
- call_args_stackframe = ticode->hl()->call.args;
- target_stackframe = &tproc->args;
- lhs = picode->hl()->asgn.lhs;
- type = lhs->expr.ident.idType;
- if (type == REGISTER)
- {
- regL = id_arr[lhs->expr.ident.idNode.regiIdx].id.regi;
- if (regL < rAL)
- tidx = tproc->localId.newByteWordReg(TYPE_WORD_SIGN, regL);
- else
- tidx = tproc->localId.newByteWordReg(TYPE_BYTE_SIGN, regL);
- }
- else if (type == LONG_VAR)
- {
- int longIdx = lhs->expr.ident.idNode.longIdx;
- regL = id_arr[longIdx].id.longId.l;
- regH = id_arr[longIdx].id.longId.h;
- tidx = tproc->localId.newLongReg(TYPE_LONG_SIGN, regH, regL, tproc->Icode.begin() /*0*/);
- }
- /* Check if register argument already on the formal argument list */
- regExist = false;
- for(STKSYM &tgt_sym : *target_stackframe)
- {
- if( tgt_sym.regs == NULL ) // both REGISTER and LONG_VAR require this precondition
- continue;
- if (type == REGISTER)
- {
- if ( tgt_sym.regs->expr.ident.idNode.regiIdx == tidx )
- {
- regExist = true;
- }
- }
- else if (type == LONG_VAR)
- {
- if ( tgt_sym.regs->expr.ident.idNode.longIdx == tidx )
- {
- regExist = true;
- }
- }
- if(regExist == true)
- break;
- }
- /* Do ts (formal arguments) */
- if (regExist == false)
- {
- STKSYM newsym;
- newsym.setArgName(target_stackframe->size());
- if (type == REGISTER)
- {
- if (regL < rAL)
- {
- newsym.type = TYPE_WORD_SIGN;
- newsym.regs = COND_EXPR::idRegIdx(tidx, WORD_REG);
- }
- else
- {
- newsym.type = TYPE_BYTE_SIGN;
- newsym.regs = COND_EXPR::idRegIdx(tidx, BYTE_REG);
- }
- tproc->localId.id_arr[tidx].name = newsym.name;
- }
- else if (type == LONG_VAR)
- {
- newsym.regs = COND_EXPR::idLongIdx (tidx);
- newsym.type = TYPE_LONG_SIGN;
- tproc->localId.id_arr[tidx].name = newsym.name;
- tproc->localId.propLongId (regL, regH, tproc->localId.id_arr[tidx].name.c_str());
- }
- target_stackframe->push_back(newsym);
- target_stackframe->numArgs++;
- }
- /* Do ps (actual arguments) */
- STKSYM newsym;
- newsym.setArgName(call_args_stackframe->size());
- newsym.actual = picode->hl()->asgn.rhs;
- newsym.regs = lhs;
- /* Mask off high and low register(s) in picode */
- switch (type) {
- case REGISTER:
- id = &id_arr[lhs->expr.ident.idNode.regiIdx];
- picode->du.def &= maskDuReg[id->id.regi];
- if (id->id.regi < rAL)
- newsym.type = TYPE_WORD_SIGN;
- else
- newsym.type = TYPE_BYTE_SIGN;
- break;
- case LONG_VAR:
- id = &id_arr[lhs->expr.ident.idNode.longIdx];
- picode->du.def &= maskDuReg[id->id.longId.h];
- picode->du.def &= maskDuReg[id->id.longId.l];
- newsym.type = TYPE_LONG_SIGN;
- break;
- }
- call_args_stackframe->push_back(newsym);
- call_args_stackframe->numArgs++;
- }
- /** Inserts the new expression (ie. the actual parameter) on the argument
- * list.
- * @return true if it was a near call that made use of a segment register.
- * false elsewhere
- */
- bool CallType::newStkArg(COND_EXPR *exp, llIcode opcode, Function * pproc)
- {
- uint8_t regi;
- /* Check for far procedure call, in which case, references to segment
- * registers are not be considered another parameter (i.e. they are
- * long references to another segment) */
- if (exp)
- {
- if ((exp->m_type == IDENTIFIER) && (exp->expr.ident.idType == REGISTER))
- {
- regi = pproc->localId.id_arr[exp->expr.ident.idNode.regiIdx].id.regi;
- if ((regi >= rES) && (regi <= rDS))
- if (opcode == iCALLF)
- return false;
- else
- return true;
- }
- }
- /* Place register argument on the argument list */
- STKSYM newsym;
- newsym.actual = exp;
- args->push_back(newsym);
- args->numArgs++;
- return false;
- }
- /* Places the actual argument exp in the position given by pos in the
- * argument list of picode. */
- void CallType::placeStkArg (COND_EXPR *exp, int pos)
- {
- (*args)[pos].actual = exp;
- (*args)[pos].setArgName(pos);
- }
- COND_EXPR *CallType::toId()
- {
- return COND_EXPR::idFunc( proc, args);
- }
- /* Checks to determine whether the expression (actual argument) has the
- * same type as the given type (from the procedure's formal list). If not,
- * the actual argument gets modified */
- void adjustActArgType (COND_EXPR *exp, hlType forType, Function * pproc)
- {
- PROG &prog(Project::get()->prog);
- hlType actType;
- int offset, offL;
- if (exp == NULL)
- return;
- actType = exp-> expType (pproc);
- if (((actType == forType) || (exp->m_type != IDENTIFIER)))
- return;
- switch (forType)
- {
- case TYPE_UNKNOWN: case TYPE_BYTE_SIGN:
- case TYPE_BYTE_UNSIGN: case TYPE_WORD_SIGN:
- case TYPE_WORD_UNSIGN: case TYPE_LONG_SIGN:
- case TYPE_LONG_UNSIGN: case TYPE_RECORD:
- break;
- case TYPE_PTR:
- case TYPE_CONST:
- break;
- case TYPE_STR:
- switch (actType) {
- case TYPE_CONST:
- /* It's an offset into image where a string is
- * found. Point to the string. */
- offL = exp->expr.ident.idNode.kte.kte;
- if (prog.fCOM)
- offset = (pproc->state.r[rDS]<<4) + offL + 0x100;
- else
- offset = (pproc->state.r[rDS]<<4) + offL;
- exp->expr.ident.idNode.strIdx = offset;
- exp->expr.ident.idType = STRING;
- break;
- case TYPE_PTR:
- /* It's a pointer to a char rather than a pointer to
- * an integer */
- /***HERE - modify the type ****/
- break;
- case TYPE_WORD_SIGN:
- break;
- } /* eos */
- break;
- }
- }
- /* Determines whether the formal argument has the same type as the given
- * type (type of the actual argument). If not, the formal argument is
- * changed its type */
- void STKFRAME::adjustForArgType(int numArg_, hlType actType_)
- {
- hlType forType;
- STKSYM * psym, * nsym;
- int off, i;
- /* If formal argument does not exist, do not create new ones, just
- * ignore actual argument
- */
- if(numArg_>size())
- return;
- /* Find stack offset for this argument */
- off = m_minOff;
- i=0;
- for(STKSYM &s : *this) // walk formal arguments upto numArg_
- {
- if(i>=numArg_)
- break;
- off+=s.size;
- i++;
- }
- /* Find formal argument */
- //psym = &at(numArg_);
- //i = numArg_;
- //auto iter=std::find_if(sym.begin(),sym.end(),[off](STKSYM &s)->bool {s.off==off;});
- auto iter=std::find_if(begin()+numArg_,end(),[off](STKSYM &s)->bool {s.label==off;});
- if(iter==end()) // symbol not found
- return;
- psym = &(*iter);
- forType = psym->type;
- if (forType != actType_)
- {
- switch (actType_) {
- case TYPE_UNKNOWN: case TYPE_BYTE_SIGN:
- case TYPE_BYTE_UNSIGN: case TYPE_WORD_SIGN:
- case TYPE_WORD_UNSIGN: case TYPE_RECORD:
- break;
- case TYPE_LONG_UNSIGN: case TYPE_LONG_SIGN:
- if ((forType == TYPE_WORD_UNSIGN) ||
- (forType == TYPE_WORD_SIGN) ||
- (forType == TYPE_UNKNOWN))
- {
- /* Merge low and high */
- psym->type = actType_;
- psym->size = 4;
- nsym = psym + 1;
- nsym->macro = "HI";
- psym->macro = "LO";
- nsym->hasMacro = true;
- psym->hasMacro = true;
- nsym->name = psym->name;
- nsym->invalid = true;
- numArgs--;
- }
- break;
- case TYPE_PTR:
- case TYPE_CONST:
- case TYPE_STR:
- break;
- } /* eos */
- }
- }
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