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dataflow.cpp
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dataflow.cpp
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/*****************************************************************************
* Project: dcc
* File: dataflow.c
* Purpose: Data flow analysis module.
* (C) Cristina Cifuentes
****************************************************************************/
#include "dcc.h"
#include "project.h"
#include "msvc_fixes.h"
#include <boost/range.hpp>
#include <boost/range/adaptor/filtered.hpp>
#include <boost/range/adaptor/reversed.hpp>
#include <boost/range/algorithm.hpp>
#include <boost/assign.hpp>
#include <stdint.h>
#include <cstring>
#include <iostream>
#include <iomanip>
#include <cstdio>
using namespace boost;
using namespace boost::adaptors;
using namespace std;
namespace
{
struct ExpStack
{
Function *func;
using EXP_STK = std::list<Expr *>;
EXP_STK expStk; /* local expression stack */
void init(Function *f);
void push(Expr *);
Expr * pop();
Expr * top() const {
if(not expStk.empty()) {
return expStk.back();
}
return nullptr;
}
int numElem();
bool empty();
void processExpPush(int &numHlIcodes, ICODE &picode)
{
RegisterNode *rn = dynamic_cast<RegisterNode *>(picode.hlU()->expr());
if(rn)
assert(rn->m_syms==&func->localId);
push(picode.hlU()->expr());
picode.invalidate();
numHlIcodes--;
}
};
ExpStack g_exp_stk;
/** Returns a string with the source operand of Icode */
Expr *srcIdent (const LLInst &ll_insn, Function * pProc, iICODE i, ICODE & duIcode, operDu du)
{
const LLOperand * src_op = ll_insn.get(SRC);
if (src_op->isImmediate()) /* immediate operand ll_insn.testFlags(I)*/
{
//if (ll_insn.testFlags(B))
return new Constant(src_op->getImm2(), src_op->byteWidth());
}
// otherwise
return AstIdent::id (ll_insn, SRC, pProc, i, duIcode, du);
}
/** Returns the destination operand */
Expr *dstIdent (const LLInst & ll_insn, Function * pProc, iICODE i, ICODE & duIcode, operDu du)
{
Expr *n;
n = AstIdent::id (ll_insn, DST, pProc, i, duIcode, du);
/** Is it needed? (pIcode->ll()->flg) & NO_SRC_B **/
return (n);
}
/* Substitutes the rhs (or lhs if rhs not possible) of ticode for the expression exp given */
void forwardSubsLong (int longIdx, Expr *_exp, ICODE &picode, ICODE &ticode, int *numHlIcodes)
{
bool res;
if (_exp == nullptr) /* In case expression popped is NULL */
return;
/* Insert on rhs of ticode, if possible */
res = Expr::insertSubTreeLongReg (_exp, ticode.hlU()->asgn.m_rhs, longIdx);
if (res)
{
picode.invalidate();
(*numHlIcodes)--;
}
else
{
/* Try to insert it on lhs of ticode*/
res = Expr::insertSubTreeLongReg (_exp, ticode.hlU()->asgn.m_lhs, longIdx);
if (res)
{
picode.invalidate();
(*numHlIcodes)--;
}
}
}
} // end of anonymous namespace
/***************************************************************************
* Expression stack functions
**************************************************************************/
/* Reinitalizes the expression stack (expStk) to NULL, by freeing all the
* space allocated (if any). */
void ExpStack::init(Function *f)
{
func=f;
expStk.clear();
}
/* Pushes the given expression onto the local stack (expStk). */
void ExpStack::push(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. */
Expr *ExpStack::pop()
{
if(expStk.empty())
return nullptr;
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 */
bool ExpStack::empty()
{
return expStk.empty();
}
/* Returns the index of the local variable or parameter at offset off, if it
* is in the stack frame provided. */
size_t STKFRAME::getLocVar(int off)
{
auto iter=findByLabel(off);
return std::distance(begin(),iter);
}
/* 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 */
bool notSup; /* Use/def combination not supported */
Expr *rhs; /* Source operand */
Expr *lhs; /* Destination operand */
BinaryOperator *_expr; /* Boolean expression */
//BB * pBB; /* Pointer to BBs in dfs last ordering */
riICODE useAt; /* Instruction that used flag */
riICODE defAt; /* Instruction that defined flag */
//lhs=rhs=_expr=0;
auto valid_bbs_reversed = (m_dfsLast | reversed | filtered(BB::ValidFunctor()) );
for( BB * pBB : valid_bbs_reversed)
{
//auto reversed_instructions = pBB->range() | reversed;
for (useAt = pBB->rbegin(); useAt != pBB->rend(); ++useAt)
{
llIcode useAtOp(useAt->ll()->getOpcode());
use = useAt->ll()->flagDU.u;
if ((useAt->type != LOW_LEVEL_ICODE) or ( not useAt->valid() ) or ( 0 == use ))
continue;
/* Find definition within the same basic block */
defAt=useAt;
++defAt;
for (; defAt != pBB->rend(); ++defAt)
{
ICODE &defIcode(*defAt);
def = defAt->ll()->flagDU.d;
if ((use & def) != use)
continue;
notSup = false;
LLOperand *dest_ll = defIcode.ll()->get(DST);
if ((useAtOp >= iJB) and (useAtOp <= iJNS))
{
iICODE befDefAt = (++riICODE(defAt)).base();
switch (defIcode.ll()->getOpcode())
{
case iCMP:
rhs = srcIdent (*defIcode.ll(), this, befDefAt,*useAt, eUSE);
lhs = dstIdent (*defIcode.ll(), this, befDefAt,*useAt, eUSE);
break;
case iOR:
lhs = defIcode.hl()->asgn.lhs()->clone();
useAt->copyDU(*defAt, eUSE, eDEF);
//if (defAt->ll()->testFlags(B))
rhs = new Constant(0, dest_ll->byteWidth());
break;
case iTEST:
rhs = srcIdent (*defIcode.ll(),this, befDefAt,*useAt, eUSE);
lhs = dstIdent (*defIcode.ll(),this, befDefAt,*useAt, eUSE);
lhs = BinaryOperator::And(lhs, rhs);
// if (defAt->ll()->testFlags(B))
rhs = new Constant(0, dest_ll->byteWidth());
break;
case iINC:
case iDEC: //WARNING: verbatim copy from iOR needs fixing ?
lhs = defIcode.hl()->asgn.lhs()->clone();
useAt->copyDU(*defAt, eUSE, eDEF);
rhs = new Constant(0, dest_ll->byteWidth());
break;
default:
notSup = true;
std::cout << hex<<defIcode.loc_ip;
reportError (JX_NOT_DEF, defIcode.ll()->getOpcode());
flg |= PROC_ASM; /* generate asm */
}
if (not notSup)
{
assert(lhs);
assert(rhs);
_expr = BinaryOperator::Create(condOpJCond[useAtOp-iJB],lhs,rhs);
useAt->setJCond(_expr);
}
}
else if (useAtOp == iJCXZ)
{
//NOTICE: was rCX, 0
lhs = new RegisterNode(LLOperand(rCX, 0 ), &localId);
useAt->setRegDU (rCX, eUSE);
rhs = new Constant(0, 2);
_expr = BinaryOperator::Create(EQUAL,lhs,rhs);
useAt->setJCond(_expr);
}
// else if (useAt->getOpcode() == iRCL)
// {
// }
else
{
ICODE &a(*defAt);
ICODE &b(*useAt);
reportError (NOT_DEF_USE,a.ll()->label,a.ll()->getOpcode(),b.ll()->getOpcode());
flg |= PROC_ASM; /* generate asm */
}
break;
}
/* Check for extended basic block */
if ((pBB->size() == 1) and(useAtOp >= iJB) and (useAtOp <= iJNS))
{
ICODE & _prev(pBB->back()); /* For extended basic blocks - previous icode inst */
if (_prev.hl()->opcode == HLI_JCOND)
{
_expr = dynamic_cast<BinaryOperator *>(_prev.hl()->expr()->clone());
assert(_expr);
_expr->changeBoolOp (condOpJCond[useAtOp-iJB]);
useAt->copyDU(_prev, eUSE, eUSE);
useAt->setJCond(_expr);
}
}
/* Error - definition not found for use of a cond code */
else if (defAt == pBB->rend())
{
reportError(DEF_NOT_FOUND,useAtOp);
}
}
}
}
/** 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 ()
{
BB * pbb;
LivenessSet liveUse, def;
for (size_t i = 0; i < numBBs; i++)
{
liveUse.reset();
def.reset();
pbb = m_dfsLast[i];
if (pbb->flg & INVALID_BB)
continue; // skip invalid BBs
for(ICODE &insn : *pbb)
{
if ((insn.type == HIGH_LEVEL_ICODE) and ( insn.valid() ))
{
liveUse |= (insn.du.use - def);
def |= insn.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 (LivenessSet &in_liveOut)
{
using namespace boost::adaptors;
using namespace boost::assign;
//BB * pbb=0; /* pointer to current basic block */
Function * pcallee; /* invoked subroutine */
//ICODE *ticode /* icode that invokes a subroutine */
;
LivenessSet prevLiveOut, /* previous live out */
prevLiveIn; /* previous live in */
bool 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;
auto valid_reversed_bbs = (m_dfsLast | reversed | filtered(BB::ValidFunctor()) );
for( BB * pbb : valid_reversed_bbs) // for each valid pbb in reversed dfs order
{
/* 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->rbegin(); /* icode of function return */
if (picode->hl()->opcode == HLI_RET)
{
picode->hlU()->expr(AstIdent::idID(&retVal, &localId, (++pbb->rbegin()).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 (not (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) and /* returns a value */
(pcallee->liveOut & pbb->edges[0].BBptr->liveIn).any()
)
pbb->liveOut = pcallee->liveOut;
else
pbb->liveOut.reset();
}
if ((not (pcallee->flg & PROC_ISLIB)) or ( pbb->liveOut.any() ))
{
switch (pcallee->retVal.type) {
case TYPE_LONG_SIGN:
case TYPE_LONG_UNSIGN:
ticode.du1.setDef(rAX).addDef(rDX);
//TODO: use Calling convention to properly set regs here
break;
case TYPE_WORD_SIGN: case TYPE_WORD_UNSIGN:
case TYPE_BYTE_SIGN: case TYPE_BYTE_UNSIGN:
ticode.du1.setDef(rAX);
break;
default:
ticode.du1 = ICODE::DU1(); // was .numRegsDef = 0
//fprintf(stderr,"Function::liveRegAnalysis : Unknown return type %d, assume 0\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 = LivenessSet(pbb->liveUse + (pbb->liveOut - pbb->def));
/* Check if live sets have been modified */
if ((prevLiveIn != pbb->liveIn) or (prevLiveOut != pbb->liveOut))
change = true;
}
}
BB *pbb = m_dfsLast.front();
/* Propagate liveIn(b) to procedure header */
if (pbb->liveIn.any()) /* uses registers */
liveIn = pbb->liveIn;
/* Remove any references to register variables */
if (flg & SI_REGVAR)
{
liveIn.clrReg(rSI);
pbb->liveIn.clrReg(rSI);
}
if (flg & DI_REGVAR)
{
liveIn.clrReg(rDI);
pbb->liveIn.clrReg(rDI);
}
}
/* Check remaining instructions of the BB for all uses
* of register regi, before any definitions of the
* register */
bool BB::FindUseBeforeDef(eReg regi, int defRegIdx, iICODE start_at)
{
if ((regi == rDI) and (flg & DI_REGVAR))
return true;
if ((regi == rSI) and (flg & SI_REGVAR))
return true;
if (std::distance(start_at,end())>1) /* several instructions */
{
iICODE ticode=end();
// Only check uses of HIGH_LEVEL icodes
auto hl_range=make_iterator_range(start_at,end()) | filtered(ICODE::select_high_level);
auto checked_icode=hl_range.begin();
++checked_icode;
for (; checked_icode != hl_range.end(); ++checked_icode)
{
ICODE &ic(*checked_icode);
/* if used, get icode index */
if ( ic.du.use.testRegAndSubregs(regi) )
start_at->du1.recordUse(defRegIdx,checked_icode.base());
/* if defined, stop finding uses for this reg */
if (ic.du.def.testRegAndSubregs(regi))
{
ticode=checked_icode.base();
break;
}
}
if(ticode==end())
ticode=(++riICODE(rbegin())).base();
/* Check if last definition of this register */
if (not ticode->du.def.testRegAndSubregs(regi) and liveOut.testRegAndSubregs(regi) )
start_at->du.lastDefRegi.addReg(regi);
}
else /* only 1 instruction in this basic block */
{
/* Check if last definition of this register */
if ( liveOut.testRegAndSubregs(regi) )
start_at->du.lastDefRegi.addReg(regi);
}
return false;
}
/* 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. */
void BB::ProcessUseDefForFunc(eReg regi, int defRegIdx, ICODE &picode)
{
if (not ((picode.hl()->opcode == HLI_CALL) and (picode.hl()->call.proc->flg & PROC_IS_FUNC)))
return;
BB *tbb = this->edges[0].BBptr;
auto target_instructions = tbb->instructions | filtered(ICODE::select_high_level);
for (auto iter=target_instructions.begin(); iter!=target_instructions.end(); ++iter)
{
/* if used, get icode index */
if ( iter->du.use.testRegAndSubregs(regi) )
picode.du1.recordUse(defRegIdx,iter.base());
/* if defined, stop finding uses for this reg */
if (iter->du.def.testRegAndSubregs(regi))
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) and tbb->liveOut.testRegAndSubregs(regi))
picode.du.lastDefRegi.addReg(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). */
void BB::RemoveUnusedDefs(eReg regi, int defRegIdx, iICODE picode)
{
if (picode->valid() and not picode->du1.used(defRegIdx) and
(not picode->du.lastDefRegi.testRegAndSubregs(regi)) and
(not ((picode->hl()->opcode == HLI_CALL) and
(picode->hl()->call.proc->flg & PROC_ISLIB))))
{
if (not (this->liveOut.testRegAndSubregs(regi))) /* not liveOut */
{
bool res = picode->removeDefRegi (regi, defRegIdx+1,&Parent->localId);
if (res == true)
{
/* Backpatch any uses of this instruction, within
* the same BB, if the instruction was invalidated */
rICODE the_rest(begin(),picode);
for ( ICODE &back_patch_at : the_rest|reversed)
{
back_patch_at.du1.remove(0,picode);
}
}
}
else /* liveOut */
picode->du.lastDefRegi.addReg(regi);
}
}
void BB::genDU1()
{
/* Process each register definition of a HIGH_LEVEL icode instruction.
* Note that register variables should not be considered registers.
*/
assert(nullptr!=Parent);
auto all_high_levels = instructions | filtered(ICODE::select_high_level);
for (auto picode=all_high_levels.begin(); picode!=all_high_levels.end(); ++picode)
{
ICODE &ic = *picode;
int defRegIdx = 0;
// foreach defined register
for (int k = rAX; k < INDEX_BX_SI; k++)
{
if (not ic.du.def.testReg(k))
continue;
eReg regi = (eReg)(k); /* Register that was defined */
picode->du1.regi[defRegIdx] = regi;
if(FindUseBeforeDef(regi,defRegIdx, picode.base()))
continue;
ProcessUseDefForFunc(regi, defRegIdx,ic);
RemoveUnusedDefs(regi, defRegIdx, picode.base());
defRegIdx++;
/* Check if all defined registers have been processed */
if ((defRegIdx >= picode->du1.getNumRegsDef()) or (defRegIdx == MAX_REGS_DEF))
break;
}
}
}
/* Generates the du chain of each instruction in a basic block */
void Function::genDU1 ()
{
/* Traverse tree in dfsLast order */
assert(m_dfsLast.size()==numBBs);
for(BB *pbb : m_dfsLast | filtered(BB::ValidFunctor()))
{
pbb->genDU1();
}
}
/* Substitutes the rhs (or lhs if rhs not possible) of ticode for the rhs of picode. */
void LOCAL_ID::forwardSubs (Expr *lhs, Expr *rhs, ICODE &picode, ICODE &ticode, int &numHlIcodes) const
{
bool res;
UnaryOperator *lhs_unary;
while( (lhs_unary = dynamic_cast<UnaryOperator *>(lhs)) )
{
if(dynamic_cast<AstIdent *>(lhs_unary))
break;
lhs = lhs_unary->unaryExp;
}
RegisterNode * lhs_reg=dynamic_cast<RegisterNode *>(lhs_unary);
assert(lhs_reg);
if (rhs == nullptr) /* In case expression popped is NULL */
return;
/* Insert on rhs of ticode, if possible */
res = Expr::insertSubTreeReg (ticode.hlU()->asgn.m_rhs,rhs, id_arr[lhs_reg->regiIdx].id.regi, this);
if (res)
{
picode.invalidate();
numHlIcodes--;
}
else
{
/* Try to insert it on lhs of ticode*/
RegisterNode *op = dynamic_cast<RegisterNode *>(ticode.hlU()->asgn.m_lhs);
if(op)
{
eReg inserted = id_arr[lhs_reg->regiIdx].id.regi;
eReg lhsReg = id_arr[op->regiIdx].id.regi;
if((lhsReg==inserted) or Machine_X86::isSubRegisterOf(lhsReg,inserted))
{
// Do not replace ax = XYZ; given ax = H << P; with H << P =
return;
}
}
res = Expr::insertSubTreeReg (ticode.hlU()->asgn.m_lhs,rhs, id_arr[lhs_reg->regiIdx].id.regi, this);
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 UnaryOperator::xClear(rICODE range_to_check, iICODE lastBBinst, const LOCAL_ID &locs)
{
if(nullptr==unaryExp)
return false;
return unaryExp->xClear ( range_to_check, lastBBinst, locs);
}
bool BinaryOperator::xClear(rICODE range_to_check, iICODE lastBBinst, const LOCAL_ID &locs)
{
if(nullptr==m_rhs)
return false;
if ( not m_rhs->xClear (range_to_check, lastBBinst, locs) )
return false;
if(nullptr==m_lhs)
return false;
return m_lhs->xClear (range_to_check, lastBBinst, locs);
}
bool AstIdent::xClear(rICODE range_to_check, iICODE lastBBinst, const LOCAL_ID &locId)
{
if (ident.idType != REGISTER)
return true;
assert(false);
return false;
}
/** 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.
@returns the type size of the stored Arg
*/
int C_CallingConvention::processCArg (Function * callee, Function * pProc, ICODE * picode, size_t numArgs)
{
Expr *_exp;
bool res;
int size_of_arg=0;
PROG &prog(Project::get()->prog);
/* if (numArgs == 0)
return; */
assert(pProc==g_exp_stk.func);
_exp = g_exp_stk.pop();
if (callee->isLibrary() ) /* library function */
{
if (callee->args.numArgs > 0)
{
if (callee->getFunctionType()->isVarArg())
{
if (numArgs < callee->args.size()) {
if(_exp==nullptr)
fprintf(stderr,"Would try to adjustForArgType with null _exp\n");
else
_exp = pProc->adjustActArgType (_exp, callee->args[numArgs].type);
}
}
else {
if(numArgs<callee->args.size()) {
if(prog.addressingMode=='l') {
if((callee->args[numArgs].type==TYPE_STR) or (callee->args[numArgs].type==TYPE_PTR)) {
RegisterNode *rn = dynamic_cast<RegisterNode *>(g_exp_stk.top());
AstIdent *idn = dynamic_cast<AstIdent *>(g_exp_stk.top());
if(rn) {
const ID &_id(pProc->localId.id_arr[rn->regiIdx]);
assert(&pProc->localId==rn->m_syms);
if(_id.id.regi==rDS) {
g_exp_stk.pop(); // pop segment
size_of_arg += 2;
}
} else if(idn) {
Expr *tmp1 = new Constant(2,1);
Expr *tmp2 = BinaryOperator::createSHL(_exp,tmp1);
_exp = BinaryOperator::CreateAdd(g_exp_stk.top(),tmp2);
g_exp_stk.pop(); // pop segment
size_of_arg += 2;
}
}
}
_exp = pProc->adjustActArgType (_exp, callee->args[numArgs].type);
} else {
fprintf(stderr,"processCArg tried to query non existent arg\n");
}
}
}
}
else /* user function */
{
if (callee->args.numArgs > 0)
{
if(_exp==nullptr)
fprintf(stderr,"Would try to adjustForArgType with null _exp\n");
else
callee->args.adjustForArgType (numArgs, _exp->expType (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)
{
if(_exp==nullptr)
return 2+size_of_arg;
return _exp->hlTypeSize (pProc)+size_of_arg;
}
return 0; // be default we do not know the size of the argument
}
/** 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 LOCAL_ID::processTargetIcode(ICODE &picode, int &numHlIcodes, ICODE &ticode,bool isLong) const
{
bool res;
HLTYPE &p_hl(*picode.hlU());
HLTYPE &t_hl(*ticode.hlU());
AstIdent *lhs_ident = dynamic_cast<AstIdent *>(p_hl.asgn.lhs());
switch (t_hl.opcode)
{
case HLI_ASSIGN:
assert(lhs_ident);
if(isLong)
{
forwardSubsLong (lhs_ident->ident.idNode.longIdx,
p_hl.asgn.m_rhs, picode,ticode,
&numHlIcodes);
}
else
this->forwardSubs (lhs_ident, p_hl.asgn.m_rhs, picode, ticode, numHlIcodes);
break;
case HLI_JCOND: case HLI_PUSH: case HLI_RET:
if(isLong)
{
assert(lhs_ident);
res = Expr::insertSubTreeLongReg (
p_hl.asgn.m_rhs,
t_hl.exp.v,
lhs_ident->ident.idNode.longIdx);
}
else
{
RegisterNode *lhs_reg = dynamic_cast<RegisterNode *>(p_hl.asgn.lhs());
assert(lhs_reg);
res = Expr::insertSubTreeReg (
t_hl.exp.v,
p_hl.asgn.m_rhs,
id_arr[lhs_reg->regiIdx].id.regi,
this);
}
if (res)
{
picode.invalidate();
numHlIcodes--;
}
break;
case HLI_CALL: /* register arguments */
newRegArg ( picode, ticode);
picode.invalidate();
numHlIcodes--;
break;
default:
fprintf(stderr,"unhandled LOCAL_ID::processTargetIcode opcode %d\n",t_hl.opcode);
}
}
void C_CallingConvention::processHLI(Function *func,Expr *_exp, iICODE picode) {
Function * pp;
int cb, numArgs;
int k;
pp = picode->hl()->call.proc;
cb = picode->hl()->call.args->cb;
numArgs = 0;
k = 0;
if (cb)
{
while ( k < cb )
{
k+=processCArg (pp, func, &(*picode), numArgs);
numArgs++;
}
}
else if ((cb == 0) and picode->ll()->testFlags(REST_STK))
{
while (not g_exp_stk.empty())
{
k+=processCArg (pp, func, &(*picode), numArgs);
numArgs++;
}
}
}
void Pascal_CallingConvention::processHLI(Function *func,Expr *_exp, iICODE picode) {
Function * pp;
int cb, numArgs;
bool res;
int k;
pp = picode->hl()->call.proc;
cb = pp->cbParam; /* fixed # arguments */
k = 0;
numArgs = 0;
while(k<cb)
{
_exp = g_exp_stk.pop();
if (pp->isLibrary() ) /* library function */
{
if (pp->args.numArgs > 0)
_exp = func->adjustActArgType(_exp, pp->args[numArgs].type);
res = picode->newStkArg (_exp, picode->ll()->getOpcode(), func);
}
else /* user function */
{
if (pp->args.numArgs >0)
{
if(_exp==nullptr)
{
fprintf(stderr,"Would try to adjustForArgType with null _exp\n");
}
else
pp->args.adjustForArgType (numArgs,_exp->expType (func));
}
res = picode->newStkArg (_exp, picode->ll()->getOpcode(), func);
}
if (res == false)
k += _exp->hlTypeSize (func);
numArgs++;
}
}
void Function::processHliCall(Expr *_exp, iICODE picode)
{
Function * pp = picode->hl()->call.proc;
pp->callingConv()->processHLI(this,_exp,picode);
}
void BB::findBBExps(LOCAL_ID &locals,Function *fnc)
{
bool res;
ID *_retVal; // function return value
Expr *_exp; // expression pointer - for HLI_POP and HLI_CALL */
iICODE ticode; // Target icode */
HLTYPE *ti_hl=nullptr;
uint8_t regi;
numHlIcodes = 0;
assert(&fnc->localId==&locals);
// register(s) to be forward substituted */
auto valid_and_highlevel = instructions | filtered(ICODE::TypeAndValidFilter<HIGH_LEVEL_ICODE>());
for (auto picode = valid_and_highlevel.begin(); picode != valid_and_highlevel.end(); picode++)
{
ICODE &_ic(*picode);
HLTYPE &_icHl(*_ic.hlU());
numHlIcodes++;
if (_ic.du1.getNumRegsDef() == 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 (_ic.du1.numUses(0)==1)
{
/* Check that this register is not liveOut, if it
* is the last definition of the register */
regi = _ic.du1.regi[0];
/* Check if we can forward substitute this register */
switch (_icHl.opcode)
{
case HLI_ASSIGN:
/* Replace rhs of current icode into target
* icode expression */
ticode = _ic.du1.idx[0].uses.front();
if ((_ic.du.lastDefRegi.testRegAndSubregs(regi)) and
((ticode->hl()->opcode != HLI_CALL) and
(ticode->hl()->opcode != HLI_RET)))
continue;
if (_icHl.asgn.m_rhs->xClear (make_iterator_range(picode.base(),_ic.du1.idx[0].uses[0]),
end(), locals))
{
locals.processTargetIcode(_ic, numHlIcodes, *ticode,false);
}
break;
case HLI_POP:
// TODO: sometimes picode->du1.idx[0].uses.front() points to next basic block ?
// pop X
// lab1:
// call F() <- somehow this is marked as user of POP ?
ticode = _ic.du1.idx[0].uses.front();
ti_hl = ticode->hlU();
if ((_ic.du.lastDefRegi.testRegAndSubregs(regi)) and
((ti_hl->opcode != HLI_CALL) and
(ti_hl->opcode != HLI_RET)))
continue;
_exp = g_exp_stk.pop(); /* pop last exp pushed */
switch (ticode->hl()->opcode) {
case HLI_ASSIGN:
locals.forwardSubs(_icHl.expr(), _exp, _ic, *ticode, numHlIcodes);
break;
case HLI_JCOND: case HLI_PUSH: case HLI_RET:
{
RegisterNode *v = dynamic_cast<RegisterNode *>(_icHl.expr());
assert(v);
res = Expr::insertSubTreeReg (ti_hl->exp.v,
_exp,
locals.id_arr[v->regiIdx].id.regi,
&locals);
if (res)
{
_ic.invalidate();
numHlIcodes--;
}
}
break;
/****case HLI_CALL: // register arguments
newRegArg (pProc, picode, ticode);
picode->invalidate();
numHlIcodes--;
break; */
default:
fprintf(stderr,"unhandled BB::findBBExps target opcode %d\n",ticode->hl()->opcode);
} // eos
break;
case HLI_CALL:
ticode = _ic.du1.idx[0].uses.front();
ti_hl = ticode->hlU();
_retVal = &_icHl.call.proc->retVal;
switch (ti_hl->opcode)
{
case HLI_ASSIGN:
assert(ti_hl->asgn.m_rhs);
_exp = _icHl.call.toAst();
res = Expr::insertSubTreeReg (ti_hl->asgn.m_rhs,_exp, _retVal->id.regi, &locals);
if (not res)
Expr::insertSubTreeReg (ti_hl->asgn.m_lhs, _exp,_retVal->id.regi, &locals);
//TODO: HERE missing: 2 regs
_ic.invalidate();
numHlIcodes--;
break;
case HLI_PUSH: case HLI_RET:
ti_hl->expr( _icHl.call.toAst() );
_ic.invalidate();
numHlIcodes--;
break;
case HLI_JCOND:
_exp = _icHl.call.toAst();