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pseudo.c
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// Copyright (C) 1999-2012 Core Technologies.
//
// This file is part of tpasm.
//
// tpasm is free software; you can redistribute it and/or modify
// it under the terms of the tpasm LICENSE AGREEMENT.
//
// tpasm is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// tpasm LICENSE AGREEMENT for more details.
//
// You should have received a copy of the tpasm LICENSE AGREEMENT
// along with tpasm; see the file "LICENSE.TXT".
// Handle matching and processing of assembler pseudo-ops
// NOTE: assembler pseudo-ops are those that can be considered processor
// independant.
#include "include.h"
static SYM_TABLE
*strictPseudoOpcodeSymbols,
*loosePseudoOpcodeSymbols;
// prototypes for the handler functions which need to be declared before we can build
// the opcode table
static bool HandleInclude(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleSeg(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleSegU(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleOrg(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleROrg(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleAlign(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleAlias(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleUnAlias(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleEqu(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleSet(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleUnSet(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleMacro(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleEndMacro(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleIf(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleIfdef(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleIfndef(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleElse(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleEndIf(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleSwitch(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleCase(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleBreak(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleEndSwitch(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleRepeat(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleEndRepeat(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleError(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleWarning(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleMessage(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleList(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleNoList(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleExpand(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleNoExpand(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleProcessor(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
static bool HandleEnd(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord);
// All strict pseudo-ops begin with a . to keep them from colliding with opcodes for various
// processors.
static PSEUDO_OPCODE
strictPseudoOpcodes[]=
{
{".include", HandleInclude},
{".seg", HandleSeg},
{".segu", HandleSegU},
{".seg.u", HandleSegU},
{".org", HandleOrg},
{".rorg", HandleROrg},
{".align", HandleAlign},
{".alias", HandleAlias},
{".unalias", HandleUnAlias},
{".equ", HandleEqu},
{".set", HandleSet},
{".unset", HandleUnSet},
{".macro", HandleMacro},
{".endm", HandleEndMacro},
{".if", HandleIf},
{".ifdef", HandleIfdef},
{".ifndef", HandleIfndef},
{".else", HandleElse},
{".endif", HandleEndIf},
{".switch", HandleSwitch},
{".case", HandleCase},
{".break", HandleBreak},
{".ends", HandleEndSwitch},
{".repeat", HandleRepeat},
{".endr", HandleEndRepeat},
{".error", HandleError},
{".warning", HandleWarning},
{".messg", HandleMessage},
{".message", HandleMessage},
{".list", HandleList},
{".nolist", HandleNoList},
{".expand", HandleExpand},
{".noexpand", HandleNoExpand},
{".processor", HandleProcessor},
{".end", HandleEnd},
};
// To stay compatible with old versions of tpasm, allow the loose versions
// unless told not to.
static PSEUDO_OPCODE
loosePseudoOpcodes[]=
{
{"include", HandleInclude},
{"seg", HandleSeg},
{"segu", HandleSegU},
{"seg.u", HandleSegU},
{"org", HandleOrg},
{"rorg", HandleROrg},
{"align", HandleAlign},
{"alias", HandleAlias},
{"unalias", HandleUnAlias},
{"equ", HandleEqu},
{"set", HandleSet},
{"unset", HandleUnSet},
{"macro", HandleMacro},
{"endm", HandleEndMacro},
{"if", HandleIf},
{"ifdef", HandleIfdef},
{"ifndef", HandleIfndef},
{"else", HandleElse},
{"endif", HandleEndIf},
{"switch", HandleSwitch},
{"case", HandleCase},
{"break", HandleBreak},
{"ends", HandleEndSwitch},
{"repeat", HandleRepeat},
{"endr", HandleEndRepeat},
{"error", HandleError},
{"warning", HandleWarning},
{"messg", HandleMessage},
{"message", HandleMessage},
{"list", HandleList},
{"nolist", HandleNoList},
{"expand", HandleExpand},
{"noexpand", HandleNoExpand},
{"processor", HandleProcessor},
{"end", HandleEnd},
};
static bool HandleInclude(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// include the given file into the input stream
// If there is a problem, report it and return false
{
bool
fail;
char
includeName[MAX_STRING];
unsigned int
stringLength;
bool
hunt;
fail=false;
if(contextStack->active) // if not active, includes are just ignored, since they should not change context anyway
{
if(lineLabel)
{
ReportDisallowedLabel(lineLabel);
}
hunt=false;
if(ParseQuotedString(line,lineIndex,'"','"',includeName,&stringLength)||(hunt=true,ParseQuotedString(line,lineIndex,'<','>',includeName,&stringLength)))
{
if(ParseComment(line,lineIndex)) // make sure there's nothing else on the line
{
OutputListFileLine(listingRecord,line); // output the line first so that the include contents follow it
listingRecord->wantList=false;
fail=!ProcessSourceFile(includeName,hunt); // go handle this file now
}
else
{
AssemblyComplaint(NULL,true,"Missing or incorrectly formatted include file name\n");
}
}
else
{
AssemblyComplaint(NULL,true,"Missing or incorrectly formatted include file name\n");
}
}
return(!fail);
}
static bool HandleSeg(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// create new segment, or select old one
{
char
element[MAX_STRING];
unsigned int
stringLength;
SEGMENT_RECORD
*segment;
bool
fail;
fail=false;
if(contextStack->active)
{
if(lineLabel)
{
ReportDisallowedLabel(lineLabel);
}
if(ParseQuotedString(line,lineIndex,'"','"',element,&stringLength)||ParseFirstListElement(line,lineIndex,element)) // see which processor is being chosen
{
if(ParseComment(line,lineIndex)) // make sure there's nothing else on the line
{
if((segment=MatchSegment(element))) // see if we can find an existing segment with this name
{
currentSegment=segment;
if(!currentSegment->generateOutput)
{
AssemblyComplaint(NULL,false,"Segment is uninitialized (your reference here is for an initialized segment)\n");
}
}
else
{
if((segment=CreateSegment(element,true))) // create the new segment
{
currentSegment=segment;
}
else
{
ReportComplaint(true,"Failed to create segment\n");
fail=true;
}
}
}
else
{
ReportBadOperands();
}
}
else
{
ReportBadOperands();
}
}
return(!fail);
}
static bool HandleSegU(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// create new uninitialized segment, or select old one
{
char
element[MAX_STRING];
unsigned int
stringLength;
SEGMENT_RECORD
*segment;
bool
fail;
fail=false;
if(contextStack->active)
{
if(lineLabel)
{
ReportDisallowedLabel(lineLabel);
}
if(ParseQuotedString(line,lineIndex,'"','"',element,&stringLength)||ParseFirstListElement(line,lineIndex,element)) // see which processor is being chosen
{
if(ParseComment(line,lineIndex)) // make sure there's nothing else on the line
{
if((segment=MatchSegment(element))) // see if we can find an existing segment with this name
{
currentSegment=segment;
if(currentSegment->generateOutput)
{
AssemblyComplaint(NULL,false,"Segment is initialized (your reference here is for an uninitialized segment)\n");
}
}
else
{
if((segment=CreateSegment(element,false))) // create the new segment
{
currentSegment=segment;
}
else
{
ReportComplaint(true,"Failed to create segment\n");
fail=true;
}
}
}
else
{
ReportBadOperands();
}
}
else
{
ReportBadOperands();
}
}
return(!fail);
}
static bool HandleOrg(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// Org statement, set PC within the current segment
// If there is a problem, report it and return false
{
int
address;
bool
unresolved;
bool
fail;
fail=false;
if(contextStack->active)
{
if(ParseExpression(line,lineIndex,&address,&unresolved))
{
if(ParseComment(line,lineIndex)) // make sure there's nothing else on the line
{
if(currentSegment)
{
if(!unresolved) // if unresolved, then just ignore org for the moment (it will get resolved later)
{
currentSegment->currentPC=address; // ORG to the given address
if(lineLabel)
{
fail=!AssignLabel(lineLabel,currentSegment->currentPC+currentSegment->codeGenOffset); // assign this label (after the ORG)
}
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' outside of a segment\n",opcodeName);
}
}
else
{
ReportBadOperands();
}
}
else
{
ReportBadOperands();
}
}
return(!fail);
}
static bool HandleROrg(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// Relocatable org statement, set the offset between the PC (place where code is being
// written out, and place where code is being generated (offset is normally 0)
// If there is a problem, report it and return false
{
int
address;
bool
unresolved;
bool
fail;
fail=false;
if(contextStack->active)
{
if(ParseExpression(line,lineIndex,&address,&unresolved))
{
if(ParseComment(line,lineIndex)) // make sure there's nothing else on the line
{
if(currentSegment)
{
if(!unresolved) // if unresolved, then just ignore org for the moment (it will get resolved later)
{
currentSegment->codeGenOffset=address-currentSegment->currentPC;
if(lineLabel)
{
fail=!AssignLabel(lineLabel,currentSegment->currentPC+currentSegment->codeGenOffset); // assign this label (after the RORG)
}
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' outside of a segment\n",opcodeName);
}
}
else
{
ReportBadOperands();
}
}
else
{
ReportBadOperands();
}
}
return(!fail);
}
static bool HandleAlign(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// Align the PC to a boundary which is given
// if 0 or 1 are given, do nothing
// If there is a problem, report it and return false
{
int
value;
bool
unresolved;
unsigned int
offset;
bool
fail;
fail=false;
if(contextStack->active)
{
if(ParseExpression(line,lineIndex,&value,&unresolved))
{
if(ParseComment(line,lineIndex)) // make sure there's nothing else on the line
{
if(lineLabel)
{
ReportDisallowedLabel(lineLabel);
}
if(currentSegment)
{
if(!unresolved) // if unresolved, then just ignore org for the moment (it will get resolved later)
{
if(value>0)
{
offset=currentSegment->currentPC%value;
if(offset)
{
currentSegment->currentPC+=value-offset;
}
}
else
{
AssemblyComplaint(NULL,false,"Bad value for align (%d) ignored\n",value);
}
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' outside of segment\n",opcodeName);
}
}
else
{
ReportBadOperands();
}
}
else
{
ReportBadOperands();
}
}
return(!fail);
}
static bool HandleAlias(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// ALIAS statement, set definition
// If there is a hard error, return false
{
ALIAS_RECORD
*aliasMatch;
char
aliasValue[MAX_STRING];
unsigned int
stringLength;
bool
fail;
fail=false;
if(contextStack->active)
{
if(lineLabel)
{
if(!lineLabel->isLocal)
{
if(ParseFirstNameElement(line,lineIndex,aliasValue)||ParseQuotedString(line,lineIndex,'"','"',aliasValue,&stringLength)) // think of operands as a list of one element, or as a quoted string
{
if(ParseComment(line,lineIndex)) // must be at the end of the line now
{
if(!(aliasMatch=MatchAlias(lineLabel->name))) // make sure it does not already exist
{
if(!CreateAlias(lineLabel->name,aliasValue)) // create the alias, complain if there's trouble
{
ReportComplaint(true,"Failed to create alias record\n");
fail=true;
}
}
else
{
AssemblyComplaint(NULL,true,"Alias '%s' already defined\n",lineLabel);
AssemblySupplement(&aliasMatch->whereFrom,"Conflicting alias was defined here\n");
}
}
else
{
ReportBadOperands();
}
}
else
{
AssemblyComplaint(NULL,true,"Bad alias replacement declaration\n");
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' requires a non-local label\n",opcodeName);
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' requires a label\n",opcodeName);
}
}
return(!fail);
}
static bool HandleUnAlias(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// get rid of an alias which currently exists
// If there is a hard error, return false
{
ALIAS_RECORD
*aliasMatch;
bool
fail;
fail=false;
if(contextStack->active)
{
if(lineLabel)
{
if(!lineLabel->isLocal)
{
if(ParseComment(line,lineIndex)) // must be at the end of the line now
{
if((aliasMatch=MatchAlias(lineLabel->name))) // does this alias already exist?
{
DestroyAlias(aliasMatch); // get rid of the alias
}
else
{
AssemblyComplaint(NULL,true,"'%s' not defined as an alias\n",lineLabel);
}
}
else
{
ReportBadOperands();
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' requires a non-local label\n",opcodeName);
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' requires a label\n",opcodeName);
}
}
return(!fail);
}
static bool HandleEqu(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// EQU statement, set label
// If there is a hard error, return false
{
int
value;
bool
unresolved;
bool
fail;
fail=false;
if(contextStack->active)
{
if(lineLabel)
{
if(!lineLabel->isLocal)
{
if(ParseExpression(line,lineIndex,&value,&unresolved))
{
if(ParseComment(line,lineIndex)) // make sure there's nothing else on the line
{
if(!intermediatePass)
{
CreateListStringValue(listingRecord,value,unresolved);
}
fail=!AssignConstant(lineLabel->name,value,!unresolved); // assign it (even if it is unresolved, since this way we can remember that there was an attempt to equate it)
}
else
{
ReportBadOperands();
}
}
else
{
ReportBadOperands();
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' requires a non-local label\n",opcodeName);
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' requires a label\n",opcodeName);
}
}
return(!fail);
}
static bool HandleSet(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// SET statement, set label
// If there is a problem, report it and return false
{
int
value;
bool
unresolved;
bool
fail;
fail=false;
if(contextStack->active)
{
if(lineLabel)
{
if(!lineLabel->isLocal)
{
if(ParseExpression(line,lineIndex,&value,&unresolved))
{
if(ParseComment(line,lineIndex)) // make sure there's nothing else on the line
{
if(!intermediatePass)
{
CreateListStringValue(listingRecord,value,unresolved);
}
fail=!AssignSetConstant(lineLabel->name,value,!unresolved); // assign it (even if it is unresolved, since this way we can remember that there was an attempt to equate it)
}
else
{
ReportBadOperands();
}
}
else
{
ReportBadOperands();
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' requires a non-local label\n",opcodeName);
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' requires a label\n",opcodeName);
}
}
return(!fail);
}
static bool HandleUnSet(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// UNSET statement, clear previously existing set label
// If there is a problem, report it and return false
{
bool
fail;
fail=false;
if(contextStack->active)
{
if(lineLabel)
{
if(!lineLabel->isLocal)
{
if(ParseComment(line,lineIndex)) // make sure there's nothing else on the line
{
UnAssignSetConstant(lineLabel->name); // unassign it
}
else
{
ReportBadOperands();
}
}
else
{
ReportBadOperands();
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' requires a label\n",opcodeName);
}
}
return(!fail);
}
static bool HandleMacro(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// A macro is being defined
// If there is a problem, report it and return false
// NOTE: even if the macro command was ill formed, we still enter the macro
// context (with contextStack->active=false). This generates the least confusing error output.
{
bool
fail;
MACRO_RECORD
*buildingMacro,
*macroMatch;
char
macroName[MAX_STRING];
unsigned int
i;
bool
wasActive;
fail=false;
wasActive=contextStack->active;
if(PushContextRecord(0))
{
contextStack->contextType=CT_MACRO;
contextStack->active=false;
if(wasActive)
{
if(lineLabel)
{
if(!lineLabel->isLocal)
{
i=0;
while(lineLabel->name[i]) // make macro name lower case for later case insensitive matching
{
macroName[i]=tolower(lineLabel->name[i]);
i++;
}
macroName[i]='\0';
if(!(macroMatch=LocateMacro(macroName))) // does this macro already exist?
{
if((buildingMacro=CreateMacro(macroName)))
{
if(CreateParameterNames(line,lineIndex,&buildingMacro->parameters))
{
collectingBlock=&buildingMacro->contents; // start collecting the text here (even if parameters are bad)
if(!ParseComment(line,lineIndex))
{
AssemblyComplaint(NULL,true,"Ill formed macro parameters\n");
}
}
else
{
DestroyMacro(buildingMacro); // failed to create parameter list
fail=true;
}
}
else
{
ReportComplaint(true,"Failed to create macro record\n");
fail=true;
}
}
else
{
AssemblyComplaint(NULL,true,"Macro '%s' already defined\n",macroName);
AssemblySupplement(¯oMatch->whereFrom,"Conflicting macro was defined here\n");
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' requires a non-local label\n",opcodeName);
}
}
else
{
AssemblyComplaint(NULL,true,"'%s' requires a label\n",opcodeName);
}
}
}
else
{
ReportComplaint(true,"Failed to create context record\n");
fail=true;
}
return(!fail);
}
static bool HandleEndMacro(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// Process end of macro definition
// If there is a problem, report it and return false
{
bool
fail;
fail=false;
if(contextStack->contextType==CT_MACRO)
{
PopContextRecord();
if(contextStack->active) // parent was active, therefore we were collecting text into this macro
{
collectingBlock=NULL; // stop collecting the block, we have the macro now
if(lineLabel)
{
ReportDisallowedLabel(lineLabel);
}
if(!ParseComment(line,lineIndex)) // make sure there's nothing else on the line
{
ReportBadOperands();
}
}
}
else
{
if(contextStack->active)
{
AssemblyComplaint(NULL,true,"'%s' outside of 'macro'\n",opcodeName);
}
}
return(!fail);
}
static bool HandleIf(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// Check condition, execute code immediately following if true, or after the optional else
// if false.
// If there is a problem, report it and return false
// NOTE: if the expression is undefined, neither the if, or the else
// part will be executed. The "if" statement will remain undefined until the last
// pass which defines it, or until it cannot be defined
{
int
value;
bool
unresolved;
bool
fail;
bool
wasActive;
IF_CONTEXT
*ifContext;
fail=false;
wasActive=contextStack->active;
if(PushContextRecord(sizeof(IF_CONTEXT))) // change context
{
contextStack->contextType=CT_IF;
contextStack->active=wasActive;
ifContext=(IF_CONTEXT *)&contextStack->contextData[0];
ifContext->sawElse=false;
ifContext->wantElse=false;
if(contextStack->active)
{
if(lineLabel)
{
ReportDisallowedLabel(lineLabel);
}
if(ParseExpression(line,lineIndex,&value,&unresolved))
{
if(ParseComment(line,lineIndex)) // make sure there's nothing else on the line
{
if(!intermediatePass)
{
CreateListStringValue(listingRecord,value,unresolved);
}
if(!unresolved)
{
if(value==0) // use the code below the "if"
{
contextStack->active=false; // go inactive, go active later on else if currently active
ifContext->wantElse=true;
}
}
else
{
contextStack->active=false; // unresolved, so take neither path
}
}
else
{
ReportBadOperands();
contextStack->active=false;
}
}
else
{
ReportBadOperands();
contextStack->active=false;
}
}
}
else
{
ReportComplaint(true,"Failed to create context record\n");
fail=true;
}
return(!fail);
}
static bool HandleIfdef(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// Check to see if a label is defined, execute code immediately following if true,
// or after the optional else if false.
// If there is a problem, report it and return false
{
bool
fail;
bool
wasActive;
IF_CONTEXT
*ifContext;
char
label[MAX_STRING];
bool
local;
LABEL_RECORD
*labelRecord;
fail=false;
wasActive=contextStack->active;
if(PushContextRecord(sizeof(IF_CONTEXT))) // change context
{
contextStack->contextType=CT_IF;
contextStack->active=wasActive;
ifContext=(IF_CONTEXT *)&contextStack->contextData[0];
ifContext->sawElse=false;
ifContext->wantElse=false;
if(contextStack->active)
{
if(lineLabel)
{
ReportDisallowedLabel(lineLabel);
}
if(ParseLabelString(line,lineIndex,&label[0],&local))
{
if(ParseComment(line,lineIndex)) // make sure there's nothing else on the line
{
if((labelRecord=LocateLabel(label,!intermediatePass))) // if we found it, it's defined (even if it is not resolved)
{
// already active, so no more needs to be done here
}
else
{
contextStack->active=false; // not defined, so take else path
ifContext->wantElse=true;
}
}
else
{
ReportBadOperands();
contextStack->active=false;
}
}
else
{
ReportBadOperands();
contextStack->active=false;
}
}
}
else
{
ReportComplaint(true,"Failed to create context record\n");
fail=true;
}
return(!fail);
}
static bool HandleIfndef(const char *opcodeName,const char *line,unsigned int *lineIndex,const PARSED_LABEL *lineLabel,LISTING_RECORD *listingRecord)
// Check to see if a label is not defined, execute code immediately following if true,
// or after the optional else if false.
// If there is a problem, report it and return false
{
bool
fail;
bool
wasActive;
IF_CONTEXT
*ifContext;
char
label[MAX_STRING];
bool
local;