387 lines
12 KiB
C++
387 lines
12 KiB
C++
/*****************************************************************************
|
|
* Project: dcc
|
|
* File: backend.c
|
|
* Purpose: Back-end module. Generates C code for each procedure.
|
|
* (C) Cristina Cifuentes
|
|
****************************************************************************/
|
|
#include "dcc.h"
|
|
#include "msvc_fixes.h"
|
|
#include "disassem.h"
|
|
#include "project.h"
|
|
#include "CallGraph.h"
|
|
|
|
#include <QtCore/QDir>
|
|
#include <QtCore/QFile>
|
|
#include <QtCore/QStringList>
|
|
#include <QtCore/QDebug>
|
|
#include <cassert>
|
|
#include <string>
|
|
#include <boost/range.hpp>
|
|
#include <boost/range/adaptor/filtered.hpp>
|
|
#include <boost/range/algorithm.hpp>
|
|
|
|
#include <fstream>
|
|
#include <iostream>
|
|
#include <sstream>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
|
|
using namespace boost;
|
|
using namespace boost::adaptors;
|
|
using namespace std;
|
|
|
|
bundle cCode; /* Procedure declaration and code */
|
|
|
|
/* Returns a unique index to the next label */
|
|
int getNextLabel()
|
|
{
|
|
static int labelIdx = 1; /* index of the next label */
|
|
return (labelIdx++);
|
|
}
|
|
|
|
|
|
/* displays statistics on the subroutine */
|
|
void Function::displayStats ()
|
|
{
|
|
qDebug() << "\nStatistics - Subroutine" << name;
|
|
qDebug() << "Number of Icode instructions:";
|
|
qDebug() << " Low-level :" << stats.numLLIcode;
|
|
if (not (flg & PROC_ASM))
|
|
{
|
|
qDebug() << " High-level:"<<stats.numHLIcode;
|
|
qDebug() << QString(" Percentage reduction: %1%%").arg(100.0 - (stats.numHLIcode *
|
|
100.0) / stats.numLLIcode,4,'f',2,QChar('0'));
|
|
}
|
|
}
|
|
|
|
|
|
/**** this proc is not required any more?? ****/
|
|
#if 0
|
|
static void fixupLabels (PPROC pProc)
|
|
/* Checks the graph (pProc->cfg) for any nodes that have labels, and gives
|
|
* a unique label number for it. This label is placed in the associated
|
|
* icode for the node (pProc->Icode). The procedure is done in sequential
|
|
* order of dsfLast numbering. */
|
|
{ int i; /* index into the dfsLast array */
|
|
PBB *dfsLast; /* pointer to the dfsLast array */
|
|
|
|
dfsLast = pProc->dfsLast;
|
|
for (i = 0; i < pProc->numBBs; i++)
|
|
if (dfsLast[i]->flg/* & BB_HAS_LABEL*/) {
|
|
pProc->Icode.icode[dfsLast[i]->start].ll()->flg |= HLL_LABEL;
|
|
pProc->Icode.icode[dfsLast[i]->start].ll()->hllLabNum = getNextLabel();
|
|
}
|
|
}
|
|
#endif
|
|
|
|
|
|
/* Returns the corresponding C string for the given character c. Character
|
|
* constants such as carriage return and line feed, require 2 C characters. */
|
|
char *cChar (uint8_t c)
|
|
{
|
|
static char res[3];
|
|
|
|
switch (c) {
|
|
case 0x8: /* backspace */
|
|
sprintf (res, "\\b");
|
|
break;
|
|
case 0x9: /* horizontal tab */
|
|
sprintf (res, "\\t");
|
|
break;
|
|
case 0x0A: /* new line */
|
|
sprintf (res, "\\n");
|
|
break;
|
|
case 0x0C: /* form feed */
|
|
sprintf (res, "\\f");
|
|
break;
|
|
case 0x0D: /* carriage return */
|
|
sprintf (res, "\\r");
|
|
break;
|
|
default: /* any other character*/
|
|
sprintf (res, "%c", c);
|
|
}
|
|
return (res);
|
|
}
|
|
|
|
|
|
/* Prints the variable's name and initial contents on the file.
|
|
* Note: to get to the value of the variable:
|
|
* com file: prog.Image[operand]
|
|
* exe file: prog.Image[operand+0x100] */
|
|
static void printGlobVar (QTextStream &ostr,SYM * psym)
|
|
{
|
|
int j;
|
|
PROG &prog(Project::get()->prog);
|
|
uint32_t relocOp = prog.fCOM ? psym->label : psym->label + 0x100;
|
|
|
|
switch (psym->size)
|
|
{
|
|
case 1:
|
|
ostr << "uint8_t\t"<<psym->name<<" = "<<prog.image()[relocOp]<<";\n";
|
|
break;
|
|
case 2:
|
|
ostr << "uint16_t\t"<<psym->name<<" = "<<LH(prog.image()+relocOp)<<";\n";
|
|
break;
|
|
case 4: if (psym->type == TYPE_PTR) /* pointer */
|
|
ostr << "uint16_t *\t"<<psym->name<<" = "<<LH(prog.image()+relocOp)<<";\n";
|
|
else /* char */
|
|
ostr << "char\t"<<psym->name<<"[4] = \""<<
|
|
prog.image()[relocOp]<<prog.image()[relocOp+1]<<
|
|
prog.image()[relocOp+2]<<prog.image()[relocOp+3]<<";\n";
|
|
break;
|
|
default:
|
|
{
|
|
QString strContents;
|
|
for (j=0; j < psym->size; j++)
|
|
strContents += cChar(prog.image()[relocOp + j]);
|
|
ostr << "char\t*"<<psym->name<<" = \""<<strContents<<"\";\n";
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// Note: Not called at present.
|
|
/* Writes the contents of the symbol table, along with any variable
|
|
* initialization. */
|
|
void Project::writeGlobSymTable()
|
|
{
|
|
QString contents;
|
|
QTextStream ostr(&contents);
|
|
|
|
if (symtab.empty())
|
|
return;
|
|
ostr<<"/* Global variables */\n";
|
|
for (SYM &sym : symtab)
|
|
{
|
|
if (sym.duVal.isUSE_VAL()) /* first used */
|
|
printGlobVar (ostr,&sym);
|
|
else { /* first defined */
|
|
switch (sym.size) {
|
|
case 1: ostr<<"uint8_t\t"; break;
|
|
case 2: ostr<<"int\t"; break;
|
|
case 4: if (sym.type == TYPE_PTR)
|
|
ostr<<"int\t*";
|
|
else
|
|
ostr<<"char\t*";
|
|
break;
|
|
default: ostr<<"char\t*";
|
|
}
|
|
ostr<<sym.name<<";\t/* size = "<<sym.size<<" */\n";
|
|
}
|
|
}
|
|
ostr<< "\n";
|
|
ostr.flush();
|
|
cCode.appendDecl( contents );
|
|
}
|
|
|
|
|
|
/* Writes the header information and global variables to the output C file
|
|
* fp. */
|
|
static void writeHeader (QIODevice &_ios, const std::string &fileName)
|
|
{
|
|
PROG &prog(Project::get()->prog);
|
|
/* Write header information */
|
|
cCode.init();
|
|
cCode.appendDecl( "/*\n");
|
|
cCode.appendDecl( " * Input file\t: %s\n", fileName.c_str());
|
|
cCode.appendDecl( " * File type\t: %s\n", (prog.fCOM)?"COM":"EXE");
|
|
cCode.appendDecl( " */\n\n#include \"dcc.h\"\n\n");
|
|
|
|
/* Write global symbol table */
|
|
/** writeGlobSymTable(); *** need to change them into locident fmt ***/
|
|
writeBundle (_ios, cCode);
|
|
freeBundle (&cCode);
|
|
}
|
|
|
|
// Note: Not currently called!
|
|
/** Checks the given icode to determine whether it has a label associated
|
|
* to it. If so, a goto is emitted to this label; otherwise, a new label
|
|
* is created and a goto is also emitted.
|
|
* Note: this procedure is to be used when the label is to be forward on
|
|
* the code; that is, the target code has not been traversed yet. */
|
|
#if 0
|
|
static void emitFwdGotoLabel (ICODE * pt, int indLevel)
|
|
{
|
|
if ( not pt->ll()->testFlags(HLL_LABEL)) /* node hasn't got a lab */
|
|
{
|
|
/* Generate new label */
|
|
pt->ll()->hllLabNum = getNextLabel();
|
|
pt->ll()->setFlags(HLL_LABEL);
|
|
}
|
|
cCode.appendCode( "%sgoto l%ld;\n", indentStr(indLevel), pt->ll()->hllLabNum);
|
|
}
|
|
#endif
|
|
|
|
/* Writes the procedure's declaration (including arguments), local variables,
|
|
* and invokes the procedure that writes the code of the given record *hli */
|
|
void Function::codeGen (QIODevice &fs)
|
|
{
|
|
int numLoc;
|
|
QString ostr_contents;
|
|
QTextStream ostr(&ostr_contents);
|
|
//STKFRAME * args; /* Procedure arguments */
|
|
//char buf[200], /* Procedure's definition */
|
|
// arg[30]; /* One argument */
|
|
BB *pBB; /* Pointer to basic block */
|
|
|
|
/* Write procedure/function header */
|
|
cCode.init();
|
|
if (getReturnType() != TYPE_UNKNOWN) /* Function */
|
|
ostr << QString("\n%1 %2 (").arg(TypeContainer::typeName(getReturnType())).arg(name);
|
|
else /* Procedure */
|
|
ostr << "\nvoid "+name+" (";
|
|
|
|
/* Write arguments */
|
|
struct validArg
|
|
{
|
|
bool operator()(STKSYM &s) { return s.invalid==false;}
|
|
};
|
|
QStringList parts;
|
|
for (STKSYM &arg : (args | filtered(validArg())))
|
|
{
|
|
parts << QString("%1 %2").arg(hlTypes[arg.type]).arg(arg.name);
|
|
}
|
|
ostr << parts.join(", ")+")\n";
|
|
|
|
/* Write comments */
|
|
writeProcComments( ostr );
|
|
|
|
/* Write local variables */
|
|
if (not (flg & PROC_ASM))
|
|
{
|
|
numLoc = 0;
|
|
for (ID &refId : localId )
|
|
{
|
|
/* Output only non-invalidated entries */
|
|
if ( refId.illegal )
|
|
continue;
|
|
if (refId.loc == REG_FRAME)
|
|
{
|
|
/* Register variables are assigned to a local variable */
|
|
if (((flg & SI_REGVAR) and (refId.id.regi == rSI)) or
|
|
((flg & DI_REGVAR) and (refId.id.regi == rDI)))
|
|
{
|
|
refId.setLocalName(++numLoc);
|
|
ostr << "int "<<refId.name<<";\n";
|
|
}
|
|
/* Other registers are named when they are first used in
|
|
* the output C code, and appended to the proc decl. */
|
|
}
|
|
else if (refId.loc == STK_FRAME)
|
|
{
|
|
/* Name local variables and output appropriate type */
|
|
refId.setLocalName(++numLoc);
|
|
ostr << TypeContainer::typeName(refId.type)<<" "<<refId.name<<";\n";
|
|
}
|
|
}
|
|
}
|
|
ostr.flush();
|
|
fs.write(ostr_contents.toLatin1());
|
|
|
|
/* Write procedure's code */
|
|
if (flg & PROC_ASM) /* generate assembler */
|
|
{
|
|
Disassembler ds(3);
|
|
ds.disassem(this->shared_from_this());
|
|
}
|
|
else /* generate C */
|
|
{
|
|
m_actual_cfg.front()->writeCode (1, this, &numLoc, MAX, UN_INIT);
|
|
}
|
|
|
|
cCode.appendCode( "}\n\n");
|
|
writeBundle (fs, cCode);
|
|
freeBundle (&cCode);
|
|
|
|
/* Write Live register analysis information */
|
|
if (option.verbose) {
|
|
QString debug_contents;
|
|
QTextStream debug_stream(&debug_contents);
|
|
for (size_t i = 0; i < numBBs; i++)
|
|
{
|
|
pBB = m_dfsLast[i];
|
|
if (pBB->flg & INVALID_BB) continue; /* skip invalid BBs */
|
|
debug_stream << "BB "<<i<<"\n";
|
|
debug_stream << " Start = "<<pBB->begin()->loc_ip;
|
|
debug_stream << ", end = "<<pBB->begin()->loc_ip+pBB->size()<<"\n";
|
|
debug_stream << " LiveUse = ";
|
|
Machine_X86::writeRegVector(debug_stream,pBB->liveUse);
|
|
debug_stream << "\n Def = ";
|
|
Machine_X86::writeRegVector(debug_stream,pBB->def);
|
|
debug_stream << "\n LiveOut = ";
|
|
Machine_X86::writeRegVector(debug_stream,pBB->liveOut);
|
|
debug_stream << "\n LiveIn = ";
|
|
Machine_X86::writeRegVector(debug_stream,pBB->liveIn);
|
|
debug_stream <<"\n\n";
|
|
}
|
|
debug_stream.flush();
|
|
qDebug() << debug_contents.toLatin1();
|
|
}
|
|
}
|
|
|
|
|
|
/* Recursive procedure. Displays the procedure's code in depth-first order
|
|
* of the call graph. */
|
|
static void backBackEnd (CALL_GRAPH * pcallGraph, QIODevice &_ios)
|
|
{
|
|
|
|
// IFace.Yield(); /* This is a good place to yield to other apps */
|
|
|
|
/* Check if this procedure has been processed already */
|
|
if ((pcallGraph->proc->flg & PROC_OUTPUT) or
|
|
(pcallGraph->proc->flg & PROC_ISLIB))
|
|
return;
|
|
pcallGraph->proc->flg |= PROC_OUTPUT;
|
|
|
|
/* Dfs if this procedure has any successors */
|
|
for (auto & elem : pcallGraph->outEdges)
|
|
{
|
|
backBackEnd (elem, _ios);
|
|
}
|
|
|
|
/* Generate code for this procedure */
|
|
stats.numLLIcode = pcallGraph->proc->Icode.size();
|
|
stats.numHLIcode = 0;
|
|
pcallGraph->proc->codeGen (_ios);
|
|
|
|
/* Generate statistics */
|
|
if (option.Stats)
|
|
pcallGraph->proc->displayStats ();
|
|
if (not (pcallGraph->proc->flg & PROC_ASM))
|
|
{
|
|
stats.totalLL += stats.numLLIcode;
|
|
stats.totalHL += stats.numHLIcode;
|
|
}
|
|
}
|
|
|
|
|
|
/* Invokes the necessary routines to produce code one procedure at a time. */
|
|
void BackEnd(CALL_GRAPH * pcallGraph)
|
|
{
|
|
/* Get output file name */
|
|
QString outNam(Project::get()->output_name("b")); /* b for beta */
|
|
QFile fs(outNam); /* Output C file */
|
|
|
|
/* Open output file */
|
|
if(not fs.open(QFile::WriteOnly|QFile::Text))
|
|
fatalError (CANNOT_OPEN, outNam.toStdString().c_str());
|
|
|
|
qDebug()<<"dcc: Writing C beta file"<<outNam;
|
|
|
|
/* Header information */
|
|
writeHeader (fs, option.filename.toStdString());
|
|
|
|
/* Initialize total Icode instructions statistics */
|
|
stats.totalLL = 0;
|
|
stats.totalHL = 0;
|
|
|
|
/* Process each procedure at a time */
|
|
backBackEnd (pcallGraph, fs);
|
|
|
|
/* Close output file */
|
|
fs.close();
|
|
qDebug() << "dcc: Finished writing C beta file";
|
|
}
|
|
|
|
|