mpw/bin/parser.lemon

%extra_argument { Debug::Command *command }
%token_prefix tk

%token_type { Token }
%include {
#include <stdbool.h> 
#include <stdint.h>
#include <string.h>
#include <cassert>
#include <cstddef>
#include "debugger.h"

#include <toolbox/mm.h>

using Debug::Token;

#ifdef __cplusplus
extern "C" {
#endif

uint32_t cpuGetSR();
uint32_t cpuGetPC();
uint32_t cpuGetAReg(unsigned);
uint32_t cpuGetDReg(unsigned);

#ifdef __cplusplus
}
#endif


#undef NDEBUG

}

%parse_failure {
	//fprintf(stderr,"I don't understand.\n");
	command->valid = false;
}

%parse_accept {
	command->valid = true;
}



%left PIPEPIPE.
%left AMPAMP.
%left PIPE.
%left CARET.
%left AMP.
%left EQEQ BANGEQ.
%left LT LTEQ GT GTEQ.  
%left LTLT GTGT.
%left PLUS MINUS. 
%left STAR SLASH PERCENT.
%right BANG TILDE.


stmt ::= expr(a) EOL.
{
	Debug::Print(a.intValue);
}

stmt ::= STAR EOL.
{
	Debug::PrintRegisters();
}

stmt ::= PRINT expr(a) EOL.
{
	Debug::Print(a.intValue);
}

stmt ::= BREAK EOL.
{
	Debug::Break();
}

stmt ::= BREAK expr(a) EOL.
{
	Debug::Break(a.intValue);
}

stmt ::= BACKTRACE EOL.
{
	Debug::PrintBackTrace();
}

stmt ::= CONTINUE EOL.
{
	command->action = Debug::cmdContinue;
	command->argc = 0;
}

stmt ::= TBREAK EOL.
{
	Debug::ToolBreak();
}

stmt ::= TBREAK expr(a) EOL.
{
	Debug::ToolBreak(a.intValue);
}

stmt ::= RBREAK EOL .
{
	Debug::ReadBreak();
}

stmt ::= RBREAK expr(a) EOL.
{
	Debug::ReadBreak(a.intValue);
}

stmt ::= WBREAK EOL.
{
	Debug::WriteBreak();
}

stmt ::= WBREAK expr(a) EOL.
{
	Debug::WriteBreak(a.intValue);
}


stmt ::= RWBREAK expr(a) EOL .
{
	Debug::ReadWriteBreak(a.intValue);
}


stmt ::= NEXT EOL.
{
	command->action = Debug::cmdStep;
	command->argc = 0;
}

stmt ::= NEXT expr(a) EOL.
{
	command->action = Debug::cmdStep;
	command->argc = 1;
	command->argv[0] = a.intValue;
}

stmt ::= DUMP expr(a) EOL.
{
	Debug::Dump(a.intValue);
}

stmt ::= DUMP expr(a) COLON expr(b) EOL.
{
	Debug::Dump(a.intValue, b.intValue - a.intValue);
}

stmt ::= DUMP expr(a) AT expr(b) EOL.
{
	Debug::Dump(a.intValue, b.intValue);
}

stmt ::= LIST expr(a) EOL.
{
	Debug::List(a.intValue);
}

stmt ::= STACKCRAWL EOL.
{
	Debug::StackCrawl();
}

stmt ::= expr(a) SEMI SEMIH EOL.
{
	Debug::Dump(a.intValue);
}

stmt ::= expr(a) COLON expr(b) SEMI SEMIH EOL.
{
	Debug::Dump(a.intValue, b.intValue - a.intValue);
}

stmt ::= expr(a) AT expr(b) SEMI SEMIH EOL.
{
	Debug::Dump(a.intValue, b.intValue);
}


stmt ::= expr(a) SEMI SEMII EOL.
{
	Debug::Info(a.intValue);
}


stmt ::= expr(a) SEMI SEMIL EOL.
{
	Debug::List(a.intValue);
}

stmt ::= expr(a) AT expr(b) SEMI SEMIL EOL.
{
	Debug::List(a.intValue, (int)b.intValue);
}

stmt ::= expr(a) COLON expr(b) SEMI SEMIL EOL.
{
	Debug::List(a.intValue, b.intValue);
}

stmt ::= expr(a) SEMI SEMIDATE EOL.
{
	Debug::PrintDate(a.intValue);
}

stmt ::= expr(a) SEMI SEMIERROR EOL.
{
	Debug::PrintError(a.intValue);
}



stmt ::= expr(a) SEMI SEMIT IDENTIFIER(b) EOL.
{
	Debug::ApplyTemplate(a.intValue, *b.stringValue);	
}


stmt ::= expr SEMI SEMIT error EOL.
{
	fprintf(stderr, "usage: expression ; t TemplateName\n");
}


stmt ::= DREGISTER(a) EQ expr(b) EOL.
{
	Debug::SetDRegister(a.intValue, b.intValue);
}

stmt ::= AREGISTER(a) EQ expr(b) EOL.
{
	Debug::SetARegister(a.intValue, b.intValue);
}

stmt ::= XREGISTER(a) EQ expr(b) EOL.
{
	Debug::SetXRegister(a.intValue, b.intValue);
}

stmt ::= HELP EOL.
{
	Debug::Help();
}

stmt ::= IDENTIFIER(a) EQ expr(b) EOL.
{
	Debug::VariableSet(*a.stringValue, b.intValue);
}

expr(rhs) ::= unary(a). { rhs = a; }
expr(rhs) ::= expr(a) PLUS expr(b). { rhs = Token::Make(a.intValue + b.intValue); }
expr(rhs) ::= expr(a) MINUS expr(b). { rhs = Token::Make(a.intValue - b.intValue); }
expr(rhs) ::= expr(a) STAR expr(b). { rhs = Token::Make(a.intValue * b.intValue); }
expr(rhs) ::= expr(a) SLASH expr(b). { rhs = Token::Make(a.intValue / b.intValue); }
expr(rhs) ::= expr(a) PERCENT expr(b). { rhs = Token::Make(a.intValue % b.intValue); }
expr(rhs) ::= expr(a) LTLT expr(b). { rhs = Token::Make(a.intValue << b.intValue); }
expr(rhs) ::= expr(a) GTGT expr(b). { rhs = Token::Make(a.intValue >> b.intValue); }
expr(rhs) ::= expr(a) LT expr(b). { rhs = Token::Make(a.intValue < b.intValue); }
expr(rhs) ::= expr(a) LTEQ expr(b). { rhs = Token::Make(a.intValue <= b.intValue); }
expr(rhs) ::= expr(a) GT expr(b). { rhs = Token::Make(a.intValue > b.intValue); }
expr(rhs) ::= expr(a) GTEQ expr(b). { rhs = Token::Make(a.intValue >= b.intValue); }
expr(rhs) ::= expr(a) EQEQ expr(b). { rhs = Token::Make(a.intValue == b.intValue); }
expr(rhs) ::= expr(a) BANGEQ expr(b). { rhs = Token::Make(a.intValue != b.intValue); }
expr(rhs) ::= expr(a) AMP expr(b). { rhs = Token::Make(a.intValue & b.intValue); }
expr(rhs) ::= expr(a) CARET expr(b). { rhs = Token::Make(a.intValue ^ b.intValue); }
expr(rhs) ::= expr(a) PIPE expr(b). { rhs = Token::Make(a.intValue | b.intValue); }
expr(rhs) ::= expr(a) AMPAMP expr(b). { rhs = Token::Make(a.intValue && b.intValue); }
expr(rhs) ::= expr(a) PIPEPIPE expr(b). { rhs = Token::Make(a.intValue || b.intValue); }

// 68k assembly - offset(register)
// offset is a 16-bit quantity... this will 
// handle 32-bit values or 16-bit.
expr(rhs) ::= unary(a) LPAREN register(b) RPAREN.
{
	uint32_t offset = a.intValue;
	uint32_t value = b.intValue;

	// offset is 16-bits.
	if (offset <= 0xffff)
	{
		if (offset & 0x8000)
			offset |= 0xffff0000;
	}

	rhs = Token::Make(value + offset);
}


unary(rhs) ::= term(a). { rhs = a; }
unary(rhs) ::= PLUS unary(a). [BANG] { rhs = a; }
unary(rhs) ::= MINUS unary(a). [BANG] { rhs = Token::Make(-a.intValue); }
unary(rhs) ::= TILDE unary(a). { rhs = Token::Make(~a.intValue); }
unary(rhs) ::= BANG unary(a). { rhs = Token::Make(!a.intValue); }
unary(rhs) ::= STAR unary(a). [BANG] { rhs = Token::Make(Debug::ReadLong(a)); }

term(rhs) ::= LPAREN expr(a) RPAREN. { rhs = a; }
term(rhs) ::= INTEGER(a). { rhs = a; }
term(rhs) ::= register(a). { rhs = a; }


term(rhs) ::= IDENTIFIER(a).
{
	// should throw/barf if undefined?
	rhs = Token::Make(Debug::VariableGet(*a.stringValue));
}


register(rhs) ::= DREGISTER(a). { rhs = Token::Make(cpuGetDReg(a)); }
register(rhs) ::= AREGISTER(a). { rhs = Token::Make(cpuGetAReg(a)); }
register(rhs) ::= XREGISTER(a).
{
	switch(a)
	{
	case 0: 
		rhs = Token::Make(cpuGetPC());
		break;
	case 1:
		rhs = Token::Make(cpuGetSR());
		break;
	default:
		rhs = Token::Make(0);
	}
}