int32_t CompileENDOF(ContextType *context,int32_t value)
{
UNUSED(value);
int32_t addr;
// Pop value set by OF
if (CPOP(&addr))
{
consoleErrorMessage(&MainContext,"ENDOF not matched by OF");
return 0;
}
// Check that there is a related OF
if ((addr&HEAD_MASK)!=BHEAD_OF)
{
consoleErrorMessage(&MainContext,"ENDOF not matched by OF");
return 0;
}
// Discard head
addr&=BRANCH_MASK;
// Compile leave to go to the endcase
CompileLEAVE(context,0);
// Set OF addr to current position
set16uValue(addr,CodePosition);
return 0;
}
int32_t CompileENDIF(ContextType *context,int32_t value)
{
UNUSED(value); UNUSED(context);
int32_t data;
// Pop value set by IF or ELSE
if (CPOP(&data))
{
consoleErrorMessage(&MainContext,"THEN not matched by IF or ELSE");
abortCompile();
return 0;
}
// Check that there is a related IF or ELSE
//if (!(data&BHEAD_IF))
if ((data&HEAD_MASK)!=BHEAD_IF)
{
consoleErrorMessage(&MainContext,"THEN not matched by IF or ELSE");
return 0;
}
// Discard head
data&=BRANCH_MASK;
// Set IF addr to current position
set16uValue(data,CodePosition);
return 0;
}
// Process pendent leaves
static void processLeaves(void)
{
int32_t data,addr;
uint16_t *pointer;
// Pop value set by DO
if (CPOP(&data))
{
consoleErrorMessage(&MainContext,"Cannot process leaves");
return;
}
// Check that data is about leaves
if ((data&HEAD_MASK)!=BHEAD_LEAVE)
{
consoleErrorMessage(&MainContext,"Inconsistent leave processing");
return;
}
// Discard head
data&=BRANCH_MASK;
// Discard one because 1 was added
data--;
while(MainContext.rstack.Pointer>data)
{
// Try to get one element from the return stack
if (RPOP(&addr))
{
consoleErrorMessage(&MainContext,"Inconsistent leave processing");
return;
}
// Check that data is about leaves
if ((addr&HEAD_MASK)!=BHEAD_LEAVE)
{
consoleErrorMessage(&MainContext,"Inconsistent leave processing");
return;
}
// Discard head
addr&=BRANCH_MASK;
// Set pointer
pointer=(uint16_t*)(UDict.Mem+addr);
// Set value in pointer to current code position
(*pointer)=CodePosition;
}
}
// Compiles the words:
// LOOP @LOOP
int32_t CompileLOOP(ContextType *context,int32_t value)
{
UNUSED(value); UNUSED(context);
int32_t data;
if (value==F_LOOP)
if (baseCode("LOOP"))
{
consoleErrorMessage(&MainContext,"Error compiling LOOP");
return 0;
}
if (value==F_NEW_LOOP)
if (baseCode("@LOOP"))
{
consoleErrorMessage(&MainContext,"Error compiling @LOOP");
return 0;
}
// Pop value set by DO
if (CPOP(&data))
{
consoleErrorMessage(&MainContext,"LOOP or @LOOP not matched by DO");
return 0;
}
// Check that there is a related DO
if ((data&HEAD_MASK)!=BHEAD_DO)
{
consoleErrorMessage(&MainContext,"LOOP or @LOOP not matched by DO");
return 0;
}
// Discard head
data&=BRANCH_MASK;
// Allocate space for JMP addr with addr value
allocate16u((uint16_t)data);
// Process leaves
processLeaves();
if (baseCode("UNLOOP"))
{
consoleErrorMessage(&MainContext,"Error compiling UNLOOP");
return 0;
}
return 0;
}
void _Br1 (void) { // BR1
CPOP(pc);
if (AITEM(1)==AT)
{ ADELn(2);
GETCMD;
// looking for ELSE
while (ML(pc)!=cmd_Else) pc++;
pc +=2; // so that pc points after P0
EXECMD;
} else {
ADEL;
pc++;
GETCMD;
CPUSH(pc);
pc=PCADR(cmd_BR1);
EXECMD;
}
}
int32_t CompileELSE(ContextType *context,int32_t value)
{
UNUSED(value); UNUSED(context);
int32_t data;
// Pop value set by IF
if (CPOP(&data))
{
consoleErrorMessage(&MainContext,"ELSE not matched by IF");
return 0;
}
// Check that there is a related IF
if ((data&HEAD_MASK)!=BHEAD_IF)
{
consoleErrorMessage(&MainContext,"ELSE not matched by IF");
return 0;
}
// Discard head
data&=BRANCH_MASK;
// Try to compile the JMP execute command
if (baseCode("JMP"))
{
consoleErrorMessage(&MainContext,"Error compiling ELSE");
return 0;
}
// Push current counter with IF head
CPUSH_HERE(BHEAD_IF);
// Allocate space for JMP addr with a dummy value
allocate16u(0);
// Set IF addr to current position
set16uValue(data,CodePosition);
return 0;
}
// Implements REPEAT and AGAIN
int32_t CompileREPEAT(ContextType *context,int32_t value)
{
UNUSED(value); UNUSED(context);
int32_t addr;
// Pop value set by BEGIN
if (CPOP(&addr))
{
consoleErrorMessage(&MainContext,"REPEAT/AGAIN not matched by BEGIN");
return 0;
}
// Check that there is a related BEGIN
if ((addr&HEAD_MASK)!=BHEAD_BEGIN)
{
consoleErrorMessage(&MainContext,"REPEAT/AGAIN not matched by BEGIN");
return 0;
}
// Discard head
addr&=BRANCH_MASK;
// Try to compile the JMP execute command
if (baseCode("JMP"))
{
consoleErrorMessage(&MainContext,"Error compiling REPEAT/AGAIN");
return 0;
}
// Allocate space for JMP addr with addr value
allocate16u((uint16_t)addr);
// Process leaves
processLeaves();
return 0;
}
// finish current-level interpretation ( END DSSP-procedure )
void _K (void)
{ CPOP(pc); }
void _GetR (void) { // @R
int32 RVal;
CPOP (RVal);
APUSH(RVal);
}
void _Else (void) { // ELSE
CPOP(pc);
ADEL;
}