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genasm.cpp
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genasm.cpp
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#include "stdafx.h"
//#define PRINTF_NEWLINE
static ostringstream out;
static funcitem *fitem = nullptr;
void genheader()
{
out << ".386" << endl
<< ".model flat, stdcall" << endl
<< "option casemap:none" << endl
<< "include c:/masm32/include/msvcrt.inc" << endl
<< "includelib c:/masm32/lib/msvcrt.lib" << endl
<< "" << endl
;
}
void gendataseg()
{
string type_name[] = {"", "dd", "dd"}; //define double-word/byte
out << ".data" << endl;
//all global const and vars
for(tblitem &item: glbtbl)
{
if(item.objtype == tblitem::FUNCTION)
continue;
bool isconst = (item.objtype == tblitem::CONST);
//out << " " << "align " << size_of[item.datatype] << endl;
out << " _" << item.name << " " << type_name[item.datatype] << " ";
if(item.isarray)
out << item.value << " dup(0)" <<endl;
else
{
if(isconst)
out << item.value << endl;
else
out << "0" << endl;
}
}
//all string value
for(unsigned int i=0; i<strtbl.size(); ++i)
{
if(strtbl[i] == "")
out << " s" << i << " db 0" << endl;
else
out << " s" << i << " db \"" << strtbl[i] << "\",0" << endl;
}
//format control string
out << " fmtd db \"%d\",0" << endl;
out << " fmtc db \"%c\",0" << endl;
out << " fmts db \"%s\",0" << endl;
out << " fmtnl db 10,0" << endl;//newline
out << endl;
}
//return the addressing string of immediate number / temp number / simple var/const
//or base address of array
//immediate number 10 -> 10
//temp number $5 -> DWORD PTR [ebp-20]
//simple var/const glb -> BYTE PTR _glb
// var -> DWORD PTR [ebp-8]
// para -> DWORD PTR [ebp+12]
string addrstr(qoperand qo)
{
if(qo.type == qoperand::IMD)
return tostr(qo.value);
if(qo.type == qoperand::TMP)//temp local var
return "DWORD PTR [ebp-" +
tostr(fitem->varsize + 4 + qo.value*4)
+ "]";//the first local var is [ebp-4]
tblitem &ti = getitem(qo);
if(qo.type == qoperand::GLB_OBJ)//global object
{
return "DWORD PTR _"+ti.name;
}
//local object
if(qo.value < fitem->argnum)//parameter
return "DWORD PTR [ebp+" +
tostr(8 + qo.value*4)//the first arg is [ebp+8]
+ "]";
else
return "DWORD PTR [ebp-"
+tostr(4+ti.addr)//the first local var is [ebp-4] TODO: this is not compatible with size[char_t]=1(compact store)
+"]";
}
string cmpopstr(int op)
{
switch(op)
{
case qi::JEQ: return("jz ");
case qi::JNE: return("jne");
case qi::JGE: return("jge");
case qi::JGT: return("jg ");
case qi::JLE: return("jle");
case qi::JLT: return("jl ");
}
return ("ERR");
}
void gencodeseg()
{
out << ".code" << endl;
out << "init:" << endl;
out << " call _main" << endl;
out << " invoke crt_exit" << endl;
out << endl ;
context = 0;
for(funcitem &fi: functbl)
{
fitem = &fi;
tblitem &ti = glbtbl[fi.index];
string lblexit = "exit_"+ti.name;
out << "_" << ti.name << ":" << endl
<< " push ebp" << endl
<< " mov ebp, esp" << endl
<< " sub esp, " << fi.varsize+fi.tmpamt*4 << endl;
//set value for constant first
int i = 0;
for(tblitem &cti: functbl[context].lcltbl)
{
if(cti.objtype == tblitem::CONST)
out << " mov "<<addrstr(qoperand{qoperand::LCL_OBJ, i, cti.datatype})
<< ", " << cti.value <<endl;
++i;
}
//generate asm for statements
for(qi &q: fi.qilist)
{
switch(q.op)
{
case qi::LABEL:
out << "L" << q.A.value << ":" <<endl;
break;
case qi::RET:
if(q.A.type != qoperand::BLANK)
out << " mov eax, " << addrstr(q.A) << endl;
out << " jmp " << lblexit << endl;
break;
case qi::WR:
if(q.A.type == qoperand::STRING)
out<<" invoke crt_printf,addr fmts,addr s"<<q.A.value<<endl;
else
{
out << " mov eax, " << addrstr(q.A) << endl;
assert(q.A.type == qoperand::IMD || q.A.type == qoperand::LCL_OBJ
|| q.A.type == qoperand::GLB_OBJ || q.A.type == qoperand::TMP);
if(q.A.datatype == char_t)
out<<" invoke crt_printf,addr fmtc,eax"<<endl;
else if(q.A.datatype == int_t)
out<<" invoke crt_printf,addr fmtd,eax"<<endl;
}
#ifdef PRINTF_NEWLINE
out<<" invoke crt_printf,addr fmts,addr fmtnl"<<endl;
#endif // PRINTF_NEWLINE
break;
case qi::RD:
out << " lea eax, " << addrstr(q.A) << endl;
if( getitem(q.A).datatype == char_t )
out<<" invoke crt_scanf,addr fmtc,eax"<<endl;
else
out<<" invoke crt_scanf,addr fmtd,eax"<<endl;
break;
case qi::PUSH:
out<<" mov eax, "<<addrstr(q.A)<<endl;
out<<" push eax"<<endl;
break;
case qi::CALL:
out<<" call _"<<glbtbl[q.A.value].name<<endl;
out<<" add esp, "<<functbl[glbtbl[q.A.value].value].argnum*4<<endl;
out<<" mov "<<addrstr(q.D)<<", eax"<<endl;
break;
case qi::ARRAYLOAD:
out<<" lea edx, "<<addrstr(q.A)<<endl;//base addr
out<<" mov eax, "<<addrstr(q.B)<<endl;//index
out<<" mov eax, DWORD PTR [edx+eax*"<<
size_of[getitem(q.A).datatype]<<"]"<<endl;//load
out<<" mov "<<addrstr(q.D)<<", eax"<<endl;//store
break;
case qi::ARRAYASS:
out<<" lea edx, "<<addrstr(q.A)<<endl;//base addr
out<<" mov eax, "<<addrstr(q.B)<<endl;//index
out<<" mov ecx, "<<addrstr(q.D)<<endl;//value
out<<" mov DWORD PTR [edx+eax*"<<
size_of[getitem(q.A).datatype]<<"], ecx"<<endl;//assign
break;
case qi::ASSIGN:
out<<" mov eax, "<<addrstr(q.A)<<endl;//value
out<<" mov "<<addrstr(q.D)<<", eax"<<endl;//assign
break;
case qi::JMP:
out<<" jmp L"<<q.D.value<<endl;
break;
case qi::JZ:
out<<" mov eax, "<<addrstr(q.A)<<endl;
out<<" test eax, eax"<<endl;
out<<" jz L"<<q.D.value<<endl;
break;
case qi::JNE:
case qi::JEQ:
case qi::JGT:
case qi::JGE:
case qi::JLT:
case qi::JLE:
out<<" mov eax, "<<addrstr(q.A)<<endl;
out<<" mov ecx, "<<addrstr(q.B)<<endl;
out<<" cmp eax, ecx"<<endl;
out<<" "<<cmpopstr(q.op)<<" L"<<q.D.value<<endl;
break;
case qi::MUL:
out<<" mov eax, "<<addrstr(q.A)<<endl;
out<<" imul eax, "<<addrstr(q.B)<<endl;
out<<" mov "<<addrstr(q.D)<<", eax"<<endl;
break;
case qi::DIV:
out<<" mov eax, "<<addrstr(q.A)<<endl;
out<<" cdq"<<endl;
out<<" mov ecx, "<<addrstr(q.B)<<endl;
out<<" idiv ecx"<<endl;
out<<" mov "<<addrstr(q.D)<<", eax"<<endl;
break;
case qi::ADD:
out<<" mov eax, "<<addrstr(q.A)<<endl;
out<<" add eax, "<<addrstr(q.B)<<endl;
out<<" mov "<<addrstr(q.D)<<", eax"<<endl;
break;
case qi::SUB:
out<<" mov eax, "<<addrstr(q.A)<<endl;
out<<" sub eax, "<<addrstr(q.B)<<endl;
out<<" mov "<<addrstr(q.D)<<", eax"<<endl;
break;
case qi::NEG:
out<<" mov eax, "<<addrstr(q.A)<<endl;
out<<" neg eax"<<endl;
out<<" mov "<<addrstr(q.D)<<", eax"<<endl;
break;
case qi::NOP:
break;
default:
assert(0);
}
}
out << lblexit << ":" << endl
<< " mov esp, ebp" << endl
<< " pop ebp" << endl
<< " ret" << endl
<< endl;
++context;
}
}
void genasm()
{
genheader();
gendataseg();
gencodeseg();
out << endl;
out << "end init";
*asm_output << out.str() << endl;
}