void EmitChar(char c)
{
if (G_PREV_OP != 0) {
EmitByte(G_PREV_OP);
G_PREV_OP = 0;
}
if (c == '-' || c == '+') {
G_PREV_OP = c;
} else {
EmitByte(c);
}
}
void Ia32Codegen::Emit(Ia32Instr instr, const Ia32Op& op, const Ia32Op& op2) {
switch (instr) {
case Ia32Instr::INSTR_MOV:
{
if (op.Type == Ia32Op::OP_REG && op.BaseReg==REG_A_CX && op2.Type == Ia32Op::OP_OFFSET) {
EmitByte(0xB9);
EmitInt32(op2.Offset);
} else
Throw(E_NOTIMPL);
}
break;
case Ia32Instr::INSTR_CALL:
switch (op.BaseReg & ~REG_MASK) {
case REG_GP:
EmitByte(0xFF);
EmitByte(0xD0 | (op.BaseReg & REG_MASK));
break;
}
break;
case Ia32Instr::INSTR_RET:
if (op.Type == Ia32Op::OP_NONE)
EmitByte(0xC3);
else {
EmitByte(0xC2);
EmitInt16((int16_t)op.Offset);
}
break;
case Ia32Instr::INSTR_IRET: EmitByte(0xCF); break;
case Ia32Instr::INSTR_PUSH:
if ((op.BaseReg & ~REG_MASK) != REG_GP)
Throw(E_FAIL);
EmitByte(0x50 | (op.BaseReg & REG_MASK));
break;
}
}
void EmitStrConst(char * str)
/*
Purpose:
Emit string constant.
This code is currently MADS specific to handle emit of single quotes.
Quotes are emitted like: 'ahaha', 39, 'sksksks'
*/
{
char * s, c;
Bool in_quotes = false;
Bool empty = true;
if (str != NULL) {
s = str;
while(c = *s++) {
if (c == '\'') {
if (in_quotes) {
EmitStr("\'");
in_quotes = false;
}
if (!empty) EmitStr(",");
EmitStr("39");
empty = false;
} else {
if (!in_quotes) {
if (!empty) EmitStr(",");
EmitStr("c\'");
in_quotes = true;
}
EmitByte(c);
empty = false;
}
}
if (in_quotes) {
EmitStr("\'");
}
}
}
void Emit1 (unsigned char OPC, ExprNode* Value)
/* Emit an instruction with an one byte argument */
{
Emit0 (OPC);
EmitByte (Value);
}
