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generator.cpp
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generator.cpp
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#include <cassert>
#include <string>
#include <algorithm>
#include <sstream>
#include "main.h"
//////////////////////////////////////////////////////////////////////
const GeneratorKeywordSpec Generator::m_keywordspecs[] =
{
{ KeywordBEEP, &Generator::GenerateBeep },
{ KeywordBLOAD, &Generator::GenerateIgnoredStatement },
{ KeywordBSAVE, &Generator::GenerateIgnoredStatement },
{ KeywordCIRCLE, &Generator::GenerateCircle },
{ KeywordCLEAR, &Generator::GenerateClear },
{ KeywordCLOAD, &Generator::GenerateIgnoredStatement },
{ KeywordCLOSE, &Generator::GenerateClose },
{ KeywordCLS, &Generator::GenerateCls },
{ KeywordCOLOR, &Generator::GenerateColor },
{ KeywordCSAVE, &Generator::GenerateIgnoredStatement },
{ KeywordDATA, &Generator::GenerateData },
{ KeywordDIM, &Generator::GenerateDim },
{ KeywordDRAW, &Generator::GenerateDraw },
{ KeywordEND, &Generator::GenerateEnd },
{ KeywordFOR, &Generator::GenerateFor },
{ KeywordGOSUB, &Generator::GenerateGosub },
{ KeywordGOTO, &Generator::GenerateGoto },
{ KeywordIF, &Generator::GenerateIf },
{ KeywordINPUT, &Generator::GenerateInput },
{ KeywordKEY, &Generator::GenerateIgnoredStatement },
{ KeywordLET, &Generator::GenerateLet },
{ KeywordLINE, &Generator::GenerateLine },
{ KeywordLOAD, &Generator::GenerateIgnoredStatement },
{ KeywordLOCATE, &Generator::GenerateLocate },
{ KeywordNEXT, &Generator::GenerateNext },
{ KeywordON, &Generator::GenerateOn },
{ KeywordOPEN, &Generator::GenerateOpen },
{ KeywordOUT, &Generator::GenerateOut },
{ KeywordPAINT, &Generator::GeneratePaint },
{ KeywordPOKE, &Generator::GeneratePoke },
{ KeywordPRINT, &Generator::GeneratePrint },
{ KeywordPSET, &Generator::GeneratePset },
{ KeywordPRESET, &Generator::GeneratePreset },
{ KeywordREAD, &Generator::GenerateRead },
{ KeywordREM, &Generator::GenerateRem },
{ KeywordRESTORE, &Generator::GenerateRestore },
{ KeywordRETURN, &Generator::GenerateReturn },
{ KeywordSAVE, &Generator::GenerateIgnoredStatement },
{ KeywordSCREEN, &Generator::GenerateScreen },
{ KeywordSTOP, &Generator::GenerateStop },
{ KeywordTRON, &Generator::GenerateIgnoredStatement },
{ KeywordTROFF, &Generator::GenerateIgnoredStatement },
{ KeywordWIDTH, &Generator::GenerateWidth },
};
const GeneratorOperSpec Generator::m_operspecs[] =
{
{ "+", &Generator::GenerateOperPlus },
{ "-", &Generator::GenerateOperMinus },
{ "*", &Generator::GenerateOperMul },
{ "/", &Generator::GenerateOperDiv },
{ "\\", &Generator::GenerateOperDivInt },
{ "MOD", &Generator::GenerateOperMod },
{ "^", &Generator::GenerateOperPower },
{ "=", &Generator::GenerateOperEqual },
{ "<>", &Generator::GenerateOperNotEqual },
{ "><", &Generator::GenerateOperNotEqual },
{ "<", &Generator::GenerateOperLess },
{ ">", &Generator::GenerateOperGreater },
{ "<=", &Generator::GenerateOperLessOrEqual },
{ ">=", &Generator::GenerateOperGreaterOrEqual },
{ "=<", &Generator::GenerateOperLessOrEqual },
{ "=>", &Generator::GenerateOperGreaterOrEqual },
{ "AND", &Generator::GenerateOperAnd },
{ "OR", &Generator::GenerateOperOr },
{ "XOR", &Generator::GenerateOperXor },
//TODO: EQV
//TODO: IMP
};
const GeneratorFuncSpec Generator::m_funcspecs[] =
{
{ KeywordABS, &Generator::GenerateFuncAbs },
{ KeywordRND, &Generator::GenerateFuncRnd },
{ KeywordPEEK, &Generator::GenerateFuncPeek },
{ KeywordINP, &Generator::GenerateFuncInp },
{ KeywordLEN, &Generator::GenerateFuncLen },
{ KeywordINKEY, &Generator::GenerateFuncInkey },
{ KeywordPOS, &Generator::GenerateFuncPos },
};
// Comparison function to sort variables by decorated names
bool CompareVariables(const VariableModel& a, const VariableModel& b)
{
string deconamea = a.GetVariableDecoratedName();
string deconameb = b.GetVariableDecoratedName();
return deconamea < deconameb;
}
Generator::Generator(SourceModel* source, FinalModel* final)
: m_source(source), m_final(final)
{
assert(source != nullptr);
assert(final != nullptr);
m_lineindex = -1;
m_line = nullptr;
}
void Generator::ProcessBegin()
{
//TODO: TITLE
m_final->AddLine("\t.MCALL\t.EXIT");
m_final->AddLine("START:");
}
void Generator::ProcessEnd()
{
m_final->AddLine("L" + std::to_string(MAX_LINE_NUMBER + 1) + ":");
m_final->AddLine("\t.EXIT"); // In case we run after last line
GenerateStrings();
GenerateVariables();
m_final->AddLine("\t.END\tSTART");
}
void Generator::GenerateStrings()
{
if (m_source->conststrings.empty())
return;
m_final->AddComment("STRINGS");
m_final->AddLine("\t.EVEN");
for (size_t i = 0; i < m_source->conststrings.size(); ++i)
{
string strdeco = "ST" + std::to_string(i + 1);
string& str = m_source->conststrings[i];
string strlen = std::to_string(str.length());
if (str.length() > 7) strlen += '.';
if (str.length() % 2 == 0) str += '\0'; // to align strings to word boundary
// Mask special symbols, mask '/'
std::ostringstream oss;
oss << strdeco << ":\t.ASCII\t<" << strlen << ">";
bool mode = false; // false = out of brackets, true = inside brackets
for (size_t i = 0; i < str.length(); i++)
{
char ch = str[i];
if ((ch >= 0 && ch < 32) || ch == '/')
{
if (mode)
{
oss << "/";
mode = false;
}
oss << "<" << std::oct << (unsigned int)ch << ">";
}
else
{
if (!mode)
{
oss << "/";
mode = true;
}
oss << ch;
}
if (oss.tellp() >= 93 - 6)
{
if (mode)
{
oss << "/";
mode = false;
}
m_final->AddLine(oss.str());
oss.str("");
oss.clear();
if (i < str.length() - 1)
oss << "\t.ASCII\t";
}
}
if (oss.tellp() > 0)
{
if (mode)
oss << "/";
m_final->AddLine(oss.str());
}
}
}
void Generator::GenerateVariables()
{
if (m_source->vars.empty())
return;
m_final->AddComment("VARIABLES");
std::sort(m_source->vars.begin(), m_source->vars.end(), CompareVariables);
for (auto it = std::begin(m_source->vars); it != std::end(m_source->vars); ++it)
{
string deconame = DecorateVariableName(it->name);
//TODO: Calculate number of array elements multiplying all indices
ValueType vtype = it->GetValueType();
switch (vtype)
{
case ValueTypeInteger:
m_final->AddLine(deconame + ":\t.WORD\t0\t; " + it->name);
break;
case ValueTypeString:
m_final->AddLine(deconame + ":\t.BLKB\t256.\t; " + it->name);
break;
default: // Single
m_final->AddLine(deconame + ":\t.WORD\t0,0\t; " + it->name);
break;
}
}
}
bool Generator::ProcessLine()
{
if (m_lineindex == INT_MAX)
return false;
if (m_lineindex < 0)
{
ProcessBegin();
m_lineindex = 0;
}
else
m_lineindex++;
if (m_lineindex >= (int)m_source->lines.size())
{
ProcessEnd();
m_lineindex = INT_MAX;
return false;
}
m_line = &(m_source->lines[m_lineindex]);
m_final->AddComment(m_line->text);
string linenumlabel = "L" + std::to_string(m_line->number) + ":";//TODO function GetLineNumberLabel
m_final->AddLine(linenumlabel);
// Find keyword generator implementation
KeywordIndex keyword = m_line->statement.token.keyword;
GeneratorMethodRef methodref = nullptr;
for (auto it = std::begin(m_keywordspecs); it != std::end(m_keywordspecs); ++it)
{
if (keyword == it->keyword)
{
methodref = it->methodref;
break;
}
}
if (methodref == nullptr)
{
Error("Generator for keyword " + GetKeywordString(keyword) + " not found.");
return true;
}
(this->*methodref)(m_line->statement);
return true;
}
void Generator::Error(const string& message)
{
std::cerr << "ERROR in line " << m_line->number << " - " << message << std::endl;
m_line->error = true;
RegisterError();
}
void Generator::GenerateExpression(const ExpressionModel& expr)
{
assert(!expr.IsEmpty());
const ExpressionNode& root = expr.nodes[expr.root];
GenerateExpression(expr, root);
}
// Generate code to calculate the expression; result will be in register R0
void Generator::GenerateExpression(const ExpressionModel& expr, const ExpressionNode& node)
{
assert(!expr.IsEmpty());
if (node.vtype != ValueTypeInteger && node.vtype != ValueTypeSingle)
{
m_final->AddComment("TODO calculate non-integer expression");
return;
}
if (node.constval)
{
int ivalue = (int)std::floor(node.node.dvalue);
if (ivalue == 0)
{
m_final->AddLine("\tCLR\tR0");
}
else
{
string svalue = "#" + std::to_string(ivalue) + ".";
m_final->AddLine("\tMOV\t" + svalue + ", R0");
}
return;
}
if (node.node.type == TokenTypeKeyword && IsFunctionKeyword(node.node.keyword))
{
GenerateExprFunction(expr, node);
return;
}
if (node.node.type == TokenTypeIdentifier)
{
string deconame = DecorateVariableName(GetCanonicVariableName(node.node.text));
m_final->AddLine("\tMOV\t" + deconame + ", R0");
return;
}
if (node.node.type == TokenTypeOperation && node.left >= 0 && node.right >= 0)
{
GenerateExprBinaryOperation(expr, node);
return;
}
if (node.left != -1 || node.right != -1)
{
m_final->AddComment("TODO generate complex expression");
return;
}
}
void Generator::GenerateExprBinaryOperation(const ExpressionModel& expr, const ExpressionNode& node)
{
const ExpressionNode& nodeleft = expr.nodes[node.left];
const ExpressionNode& noderight = expr.nodes[node.right];
if (nodeleft.vtype == ValueTypeNone || noderight.vtype == ValueTypeNone)
{
std::cerr << "ERROR in expression at " << node.node.line << ":" << node.node.pos << " - Cannot calculate value type for the node." << std::endl;
m_line->error = true;
RegisterError();
return;
}
// Find operator implementation
string text = node.node.text;
GeneratorOperMethodRef methodref = nullptr;
for (auto it = std::begin(m_operspecs); it != std::end(m_operspecs); ++it)
{
if (text == it->text)
{
methodref = it->methodref;
break;
}
}
if (methodref != nullptr)
(this->*methodref)(expr, node, nodeleft, noderight);
else
{
std::cerr << "ERROR in expression at " << node.node.line << ":" << node.node.pos << " - TODO generate operator \'" + text + "\'." << std::endl;
m_line->error = true;
RegisterError();
return;
}
}
void Generator::GenerateExprFunction(const ExpressionModel& expr, const ExpressionNode& node)
{
assert(!node.constval);
assert(node.node.keyword != KeywordNone);
assert(node.node.type == TokenTypeKeyword && IsFunctionKeyword(node.node.keyword));
KeywordIndex keyword = node.node.keyword;
GeneratorFuncMethodRef methodref = nullptr;
for (auto it = std::begin(m_funcspecs); it != std::end(m_funcspecs); ++it)
{
if (keyword == it->keyword)
{
methodref = it->methodref;
break;
}
}
if (methodref == nullptr)
{
m_final->AddComment("TODO generate function expression for " + GetKeywordString(keyword));
return;
}
(this->*methodref)(expr, node);
}
// Calculate expression and assign the result to variable
// To use in LET and FOR
void Generator::GenerateAssignment(VariableExpressionModel& var, ExpressionModel& expr)
{
const string comment = "\t; assignment";
ValueType vtype = var.GetValueType();
string deconame = var.GetVariableDecoratedName();
if (expr.IsConstExpression())
{
if (vtype == ValueTypeInteger)
{
int ivalue = (int)std::floor(expr.GetConstExpressionDValue());
if (ivalue == 0)
{
m_final->AddLine("\tCLR\t" + deconame + comment);
}
else {
string svalue = "#" + std::to_string(ivalue) + ".";
m_final->AddLine("\tMOV\t" + svalue + ", " + deconame + comment);
}
}
//TODO: version for Single type
else if (vtype == ValueTypeString)
{
string svalue = expr.GetConstExpressionSValue();
int sindex = m_source->GetConstStringIndex(svalue);
//TODO: Special case for one-char string
m_final->AddLine("\tMOV\t#ST" + std::to_string(sindex) + ", R0");
m_final->AddLine("\tMOV\t#" + deconame + ", R1");
m_final->AddLine("\tCALL\tSTRCPY" + comment);
}
}
else if (expr.IsVariableExpression())
{
string svalue = expr.GetVariableExpressionDecoratedName();
m_final->AddLine("\tMOV\t" + svalue + ", " + deconame + comment);
}
else
{
ExpressionNode& root = expr.nodes[expr.root];
// Convert "A% = A% + N" and "A% = A% - N" assignments into INC/DEC/ADD/SUB
if (vtype == ValueTypeInteger && root.node.IsBinaryOperation() &&
(root.node.text == "-" || root.node.text == "+") &&
expr.nodes[root.left].node.type == TokenTypeIdentifier &&
GetCanonicVariableName(expr.nodes[root.left].node.text) == var.name &&
expr.nodes[root.right].constval &&
(expr.nodes[root.right].vtype == ValueTypeInteger || expr.nodes[root.right].vtype == ValueTypeSingle))
{
bool plusminus = (root.node.text == "+");
int ivalue = (int)std::floor(expr.nodes[root.right].node.dvalue);
if (plusminus && ivalue == 1)
m_final->AddLine("\tINC\t" + deconame + comment);
else if (!plusminus && ivalue == 1)
m_final->AddLine("\tDEC\t" + deconame + comment);
else if (plusminus && ivalue != 1)
m_final->AddLine("\tADD\t#" + std::to_string(ivalue) + "., " + deconame + comment);
else //if (!plusminus && ivalue != 1)
m_final->AddLine("\tSUB\t#" + std::to_string(ivalue) + "., " + deconame + comment);
}
else
{
GenerateExpression(expr);
m_final->AddLine("\tMOV\tR0, " + deconame + comment);
}
}
}
void Generator::GenerateIgnoredStatement(StatementModel& statement)
{
m_final->AddComment(statement.token.text + " statement is ignored");
}
void Generator::GenerateBeep(StatementModel& statement)
{
m_final->AddLine("\tCALL\tBEEP");
}
void Generator::GenerateClear(StatementModel& statement)
{
m_final->AddComment("CLEAR statement is ignored");
}
void Generator::GenerateCls(StatementModel& statement)
{
m_final->AddLine("\tCALL\tCLS");
}
void Generator::GenerateColor(StatementModel& statement)
{
//TODO
m_final->AddComment("TODO COLOR");
}
void Generator::GenerateData(StatementModel& statement)
{
//TODO
m_final->AddComment("TODO DATA");
}
void Generator::GenerateDim(StatementModel& statement)
{
// Nothing to generate, DIM variables declared in ProcessEnd()
}
void Generator::GenerateDraw(StatementModel& statement)
{
//TODO
m_final->AddComment("TODO DRAW");
}
void Generator::GenerateEnd(StatementModel& statement)
{
// END generates JMP 65536, but only if END is not on the last line
int nextlinenum = m_source->GetNextLineNumber(m_line->number);
if (nextlinenum != MAX_LINE_NUMBER + 1)
m_final->AddLine("\tJMP\tL" + std::to_string(MAX_LINE_NUMBER + 1));
}
void Generator::GenerateFor(StatementModel& statement)
{
// Calculate expression for "from"
assert(statement.args.size() > 1);
ExpressionModel& expr1 = statement.args[0];
assert(statement.ident.type == TokenTypeIdentifier);
VariableExpressionModel var;
var.name = statement.ident.text;
string deconame = var.GetVariableDecoratedName();
// Assign the expression to the loop variable
GenerateAssignment(var, expr1);
// Calculate expression for "to"
string tovalue = "#0";
ExpressionModel& expr2 = statement.args[1];
if (expr2.IsConstExpression())
{
tovalue = "#" + std::to_string((int)std::floor(expr2.GetConstExpressionDValue())) + ".";
}
else if (expr2.IsVariableExpression())
{
string svalue = expr2.GetVariableExpressionDecoratedName();
m_final->AddLine("\tMOV\t" + svalue + ", @#<N" + std::to_string(m_line->number) + "+2>");
}
else
{
GenerateExpression(expr2);
m_final->AddLine("\tMOV\tR0, @#<N" + std::to_string(m_line->number) + "+2>"); // Save "to" value
}
if (statement.args.size() > 2) // has STEP expression
{
// Calculate expression for "step"
ExpressionModel& expr3 = statement.args[2];
GenerateExpression(expr3);
// Save "step" value
m_final->AddLine("\tMOV\tR0, @#<L" + std::to_string(statement.paramline) + "+2>");
}
int nextlinenum = m_source->GetNextLineNumber(m_line->number);
m_final->AddLine("N" + std::to_string(m_line->number) + ":\tCMP\t" + tovalue + ", " + deconame);
m_final->AddLine("\tBHIS\tL" + std::to_string(nextlinenum));
m_final->AddLine("\tJMP\tX" + std::to_string(m_line->number)); // label after NEXT
}
void Generator::GenerateGosub(StatementModel& statement)
{
string calllinenum = "\tCALL\tL" + std::to_string(statement.paramline);
m_final->AddLine(calllinenum);
}
void Generator::GenerateGoto(StatementModel& statement)
{
string jmplinenum = "\tJMP\tL" + std::to_string(statement.paramline);
m_final->AddLine(jmplinenum);
}
void Generator::GenerateIf(StatementModel& statement)
{
assert(statement.args.size() > 0);
const ExpressionModel& expr = statement.args[0];
if (expr.IsConstExpression())
{
int ivalue = (int)expr.GetConstExpressionDValue();
if (ivalue != 0) // TRUE - generate THEN only
{
//TODO: Statement under THEN
int linenum = (int)statement.params[0].dvalue;
m_final->AddLine("\tJMP\tL" + std::to_string(linenum) + "\t; THEN");
}
else // FALSE - generate ELSE only
{
//TODO: Statement under ELSE
if (statement.params.size() == 1)
m_final->AddLine("\t\t\t; ELSE do nothing");
else
{
int linenum2 = (int)statement.params[1].dvalue;
m_final->AddLine("\tJMP\tL" + std::to_string(linenum2) + "\t; ELSE");
}
}
return;
}
GenerateExpression(expr);
//TODO: set flags: Z=0 for TRUE, Z=1 for FALSE
//TODO: Statement under THEN
//TODO: Statement under ELSE
if (statement.params.size() == 1) // IF expr THEN linenum
{
int linenumnext = m_source->GetNextLineNumber(m_line->number);
m_final->AddLine("\tBEQ\tL" + std::to_string(linenumnext));
int linenum = (int)statement.params[0].dvalue;
m_final->AddLine("\tJMP\tL" + std::to_string(linenum));
}
else // IF expr THEN linenum ELSE linenum
{
m_final->AddLine("\tBEQ\t10$");
int linenum1 = (int)statement.params[0].dvalue;
m_final->AddLine("\tJMP\tL" + std::to_string(linenum1));
int linenum2 = (int)statement.params[1].dvalue;
m_final->AddLine("10$:\tJMP\tL" + std::to_string(linenum2));
}
}
void Generator::GenerateInput(StatementModel& statement)
{
if (statement.params.size() > 0) // Write the const string prompt
{
Token& param = statement.params[0];
int strindex = m_source->GetConstStringIndex(param.text);
string strdeco = "ST" + std::to_string(strindex);
m_final->AddLine("\tMOV\t" + strdeco + ", R0");
m_final->AddLine("\tCALL\tWRSTR\t; print the prompt");
}
for (auto it = std::begin(statement.variables); it != std::end(statement.variables); ++it)
{
ValueType vtype = it->GetValueType();
string vardeco = it->GetVariableDecoratedName();
if (vtype == ValueTypeInteger)
{
m_final->AddLine("\tCALL\tREADI");
m_final->AddLine("\tMOV\tR0, " + vardeco);
}
else
{
m_final->AddComment("TODO INPUT " + it->name); //TODO
}
}
}
void Generator::GenerateOpen(StatementModel& statement)
{
//TODO
m_final->AddComment("TODO OPEN");
}
void Generator::GenerateClose(StatementModel& statement)
{
//TODO
m_final->AddComment("TODO CLOSE");
}
void Generator::GenerateLet(StatementModel& statement)
{
assert(statement.args.size() == 1);
ExpressionModel& expr = statement.args[0];
VariableExpressionModel& var = statement.varexprs[0];
GenerateAssignment(var, expr);
}
void Generator::GenerateOn(StatementModel& statement)
{
ExpressionModel& expr = statement.args[0];
GenerateExpression(expr);
int numofcases = statement.params.size();
string nextline = "L" + std::to_string(m_source->GetNextLineNumber(m_line->number));
m_final->AddLine("\tDEC\tR0");
m_final->AddLine("\tBLO\t" + nextline);
m_final->AddLine("\tCMP\t#" + std::to_string(numofcases) + ", R0");
m_final->AddLine("\tBGE\t" + nextline);
m_final->AddLine("\tASL\tR0");
if (statement.gotogosub)
m_final->AddLine("\tJMP\t@10$(R0)");
else
{
m_final->AddLine("\tCALL\t@10$(R0)");
m_final->AddLine("\tBR\t" + nextline);
}
int linenum = (int)statement.params[0].dvalue;
m_final->AddLine("10$:\t.WORD\tL" + std::to_string(linenum));
for (auto it = std::begin(statement.params); it != std::end(statement.params); ++it)
{
linenum = (int)it->dvalue;
m_final->AddLine("\t.WORD\tL" + std::to_string(linenum));
}
}
void Generator::GenerateLocate(StatementModel& statement)
{
assert(statement.args.size() > 0);
//const ExpressionModel& expr1 = statement.args[0]; // column, could be empty
if (statement.args.size() > 1)
{
//const ExpressionModel& expr2 = statement.args[1]; // row, could be empty
//TODO
}
if (statement.args.size() > 2)
{
//const ExpressionModel& expr3 = statement.args[2]; // on/off, could be empty
//TODO
}
//TODO
m_final->AddComment("TODO LOCATE");
}
void Generator::GeneratePset(StatementModel& statement)
{
//TODO
m_final->AddComment("TODO PSET");
}
void Generator::GeneratePreset(StatementModel& statement)
{
//TODO
m_final->AddComment("TODO PRESET");
}
void Generator::GenerateNext(StatementModel& statement)
{
assert(statement.paramline != 0);
SourceLineModel& linefor = m_source->GetSourceLine(statement.paramline);
string varname = linefor.statement.ident.text;
string deconame = DecorateVariableName(GetCanonicVariableName(varname));
int forlinenum = statement.paramline;
if (linefor.statement.args.size() < 3)
m_final->AddLine("\tINC\t" + deconame);
else
m_final->AddLine("\tADD\t#1, " + deconame);
// JMP to continue loop
m_final->AddLine("\tJMP\tN" + std::to_string(forlinenum));
// Label after NEXT
m_final->AddLine("X" + std::to_string(forlinenum) + ":");
}
void Generator::GeneratePoke(StatementModel& statement)
{
assert(statement.args.size() == 2);
ExpressionModel& expr1 = statement.args[0];
//TODO: Simplified version for const/var expression
GenerateExpression(expr1);
// Save value
m_final->AddLine("\tMOV\tR0, @#<10$+2>");
ExpressionModel& expr2 = statement.args[1];
//TODO: Simplified version for const/var expression
GenerateExpression(expr2);
// Save value
m_final->AddLine("\tMOV\tR0, @#<10$+4>");
m_final->AddLine("10$:\tMOV\t#0, #0");
}
void Generator::GenerateOut(StatementModel& statement)
{
assert(statement.args.size() == 3);
//TODO
m_final->AddComment("TODO OUT"); //TODO
}
void Generator::GenerateLine(StatementModel& statement)
{
//TODO
m_final->AddComment("TODO LINE"); //TODO
}
void Generator::GenerateCircle(StatementModel& statement)
{
//TODO
m_final->AddComment("TODO CIRCLE"); //TODO
}
void Generator::GeneratePaint(StatementModel& statement)
{
//TODO
m_final->AddComment("TODO PAINT"); //TODO
}
void Generator::GeneratePrint(StatementModel& statement)
{
for (auto it = std::begin(statement.args); it != std::end(statement.args); ++it)
{
const ExpressionModel& expr = *it;
assert(!it->IsEmpty());
const ExpressionNode& root = expr.nodes[expr.root];
if (root.node.IsKeyword(KeywordAT))
{
GeneratePrintAt(expr);
}
else if (root.node.IsKeyword(KeywordTAB))
{
assert(root.args.size() == 1);
const ExpressionModel& expr1 = root.args[0];
GenerateExpression(expr1);
m_final->AddLine("\tCALL\tWRTAB");
}
else if (root.node.IsKeyword(KeywordSPC))
{
assert(root.args.size() == 1);
const ExpressionModel& expr1 = root.args[0];
if (!expr1.IsConstExpression() || (int)expr1.GetConstExpressionDValue() > 0) // skip SPC(0)
{
GenerateExpression(expr1);
m_final->AddLine("\tCALL\tWRSPC");
}
}
else if (root.vtype == ValueTypeString)
{
GeneratePrintString(expr);
}
else if (root.vtype == ValueTypeInteger)
{
GenerateExpression(expr);
m_final->AddLine("\tCALL\tWRINT");
}
else if (root.vtype == ValueTypeSingle)
{
GenerateExpression(expr);
m_final->AddLine("\tCALL\tWRSNG");
}
//TODO: Comma
}
// CR/LF at end of PRINT
if (!statement.nocrlf)
m_final->AddLine("\tCALL\tWRCRLF");
}
void Generator::GeneratePrintAt(const ExpressionModel& expr)
{
const ExpressionNode& root = expr.nodes[expr.root];
assert(root.args.size() == 2);
const ExpressionModel& expr1 = root.args[0];
GenerateExpression(expr1);
const ExpressionModel& expr2 = root.args[1];
GenerateExpression(expr2);//TODO: should be in R1
m_final->AddLine("\tCALL\tPRAT");
}
void Generator::GeneratePrintString(const ExpressionModel& expr)
{
assert(!expr.IsEmpty());
const ExpressionNode& root = expr.nodes[expr.root];
if (root.constval)
{
string svalue = root.node.svalue;
if (svalue.length() == 0)
return; // Empty string, nothing to print
if (svalue.length() == 1) // one-char string, no use of const string
{
//TODO: char to int conversion depends on encoding
m_final->AddLine("\tMOV\t#" + std::to_string((unsigned int)svalue[0]) + "., R0");
m_final->AddLine("\tCALL\tWRCHR");
return;
}
int sindex = m_source->GetConstStringIndex(svalue);
if (sindex < 0)
{
Error("Failed to find index for const string \"" + svalue + "\".");
return;
}
m_final->AddLine("\tMOV\t#ST" + std::to_string(sindex) + ", R0");
m_final->AddLine("\tCALL\tWRSTR");
return;
}
if (root.node.type == TokenTypeIdentifier)
{
string deconame = DecorateVariableName(GetCanonicVariableName(root.node.text));
m_final->AddLine("\tMOV\t#" + deconame + ", R0");
m_final->AddLine("\tCALL\tWRSTR");
return;
}
//TODO
m_final->AddComment("TODO PRINT string expression");
}
void Generator::GenerateRead(StatementModel& statement)
{
//TODO
m_final->AddComment("TODO READ");
}
void Generator::GenerateRem(StatementModel& statement)
{
// Do nothing
}
void Generator::GenerateRestore(StatementModel& statement)
{
//TODO
m_final->AddComment("TODO RESTORE");
}
void Generator::GenerateReturn(StatementModel& statement)
{
m_final->AddLine("\tRETURN");
}
void Generator::GenerateScreen(StatementModel& statement)
{
m_final->AddComment("SCREEN statement is ignored");
}
void Generator::GenerateStop(StatementModel& statement)
{
m_final->AddLine("\tHALT");
}
void Generator::GenerateWidth(StatementModel& statement)
{
m_final->AddComment("WIDTH statement is ignored");
}
// Operation generation //////////////////////////////////////////////
void Generator::GenerateOperPlus(const ExpressionModel& expr, const ExpressionNode& node, const ExpressionNode& nodeleft, const ExpressionNode& noderight)
{
const string comment = "\t; Operation \'+\'";
// Code to calculate left sub-expression, with result in R0
GenerateExpression(expr, nodeleft);
// Convert "XXX + N" into INC/ADD
if (nodeleft.vtype == ValueTypeInteger &&
noderight.constval && (noderight.vtype == ValueTypeInteger || noderight.vtype == ValueTypeSingle))
{
int ivalue = (int)std::floor(noderight.node.dvalue);
if (ivalue == 0)
; // Do nothing
else if (ivalue == 1)
m_final->AddLine("\tINC\tR0" + comment);
else // ivalue != 1
m_final->AddLine("\tADD\t#" + std::to_string(ivalue) + "., R0" + comment);
return;
}
// Special case for noderight as variable
if (nodeleft.vtype == ValueTypeInteger && noderight.vtype == ValueTypeInteger && noderight.node.type == TokenTypeIdentifier)
{
string deconame = DecorateVariableName(GetCanonicVariableName( noderight.node.text));
m_final->AddLine("\tADD\t" + deconame + ", R0" + comment);
return;
}
m_final->AddLine("\tMOV\tR0, -(SP)"); // PUSH R0
GenerateExpression(expr, noderight);
m_final->AddLine("\tADD\t(SP)+, R0" + comment); // POP & ADD
}
void Generator::GenerateOperMinus(const ExpressionModel& expr, const ExpressionNode& node, const ExpressionNode& nodeleft, const ExpressionNode& noderight)
{
const string comment = "\t; Operation \'-\'";
// Code to calculate left sub-expression, with result in R0
GenerateExpression(expr, nodeleft);
// Convert "XXX - N" into DEC/SUB
if (nodeleft.vtype == ValueTypeInteger &&
noderight.constval && (noderight.vtype == ValueTypeInteger || noderight.vtype == ValueTypeSingle))
{
int ivalue = (int)std::floor(noderight.node.dvalue);