347 lines
11 KiB
C
347 lines
11 KiB
C
/*
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fixups.c -- Routines to handle expressions being saved away for fixups
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in the Macross assembler.
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Chip Morningstar -- Lucasfilm Ltd.
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20-December-1984
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*/
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#include "macrossTypes.h"
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#include "macrossGlobals.h"
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operandType *dbOperand; /* safe temps for dbx hacking */
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expressionType *dbExpression;
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symbolTableEntryType *dbSymbol;
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stringType *dbString = "graphics2.m";
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#define nullDup(thing) if (thing==NULL) { return (NULL); }
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#define expansionOff() {saveExpansion=expandMacros; expandMacros=FALSE;}
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#define expansionOn() expandMacros=saveExpansion;
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/*
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Whenever a value is needed as the operand of an instruction or data
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statement, but one or more of the terms of the expression which define the
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value are themselves undefined symbols, we have to get fancy. What we do
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is use a zero value and save away a copy of the expression for later
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evaluation at a time (the end of assembly) when (hopefully) the undefined
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symbols will have been defined. It is necessary to save a copy of the
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expression, rather that the expression itself, since some of the terms of
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the expression may be variables whose value may change between now and
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when the saved expression gets reevaluated. When we are making the copy
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we replace any variables with their present values.
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The routines below collectively duplicate expressions for later evaluation.
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*/
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expressionType *
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generateFixupExpression(expression)
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expressionType *expression;
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{
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expressionType *result;
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expressionType *duplicateExpressionForFixup();
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generatingFixup = TRUE;
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result = duplicateExpressionForFixup(expression, TRUE, FALSE);
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generatingFixup = FALSE;
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return(result);
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}
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expressionType *
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duplicateExpressionForFixup(expression, isTopLevel, isSpecialFunctionOperand)
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expressionType *expression;
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bool isTopLevel;
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bool isSpecialFunctionOperand;
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{
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expressionType *result;
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expressionType *originalResult;
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valueType *value;
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symbolTableEntryType *identifier;
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symbolInContextType *context;
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operandType *newOperand;
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environmentType *saveEnvironment;
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bool saveExpansion;
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operandType *duplicateOperandForFixup();
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symbolInContextType *getWorkingContext();
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functionCallTermType *duplicateFunctionCall();
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expressionType *duplicateArrayReference();
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valueType *evaluateIdentifier();
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valueType *evaluateHere();
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valueType *newValue();
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symbolTableEntryType *generateLocalLabel();
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stringType *saveString();
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nullDup(expression);
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result = originalResult = typeAlloc(expressionType);
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*result = *expression;
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switch (expression->kindOfTerm) {
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case STRING_EXPR:
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expand(moreExpression("%s", expression->expressionTerm.stringUnion));
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result->expressionTerm.stringUnion = saveString(originalResult->
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expressionTerm.stringUnion);
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break;
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case IDENTIFIER_EXPR:
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identifier = expression->expressionTerm.identifierUnion;
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if (symbName(identifier)[0] == '$')
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identifier = result->expressionTerm.identifierUnion =
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generateLocalLabel(identifier);
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context = getWorkingContext(identifier);
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if (context->usage == ARGUMENT_SYMBOL && context->value->
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kindOfValue == OPERAND_VALUE) {
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if (isSpecialFunctionOperand) {
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while (context->usage == ARGUMENT_SYMBOL && context->value->
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kindOfValue == OPERAND_VALUE) {
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newOperand = (operandType *)context->value->value;
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if (newOperand->kindOfOperand == EXPRESSION_OPND &&
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(expression = newOperand->theOperand.
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expressionUnion) != NULL && expression->
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kindOfTerm == IDENTIFIER_EXPR) {
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identifier = expression->expressionTerm.
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identifierUnion;
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context = getWorkingContext(identifier);
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} else {
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expand(moreExpression("*fail*"));
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return(NULL);
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}
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}
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expand(moreExpression("%s", symbName(identifier)));
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result->expressionTerm.identifierUnion = identifier;
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} else {
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saveEnvironment = currentEnvironment;
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currentEnvironment = currentEnvironment->previousEnvironment;
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if ((newOperand = duplicateOperandForFixup(
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context->value->value,
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FALSE)) == NULL) {
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result = NULL;
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} else {
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result->kindOfTerm = VALUE_EXPR;
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result->expressionTerm.valueUnion =
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newValue(OPERAND_VALUE,
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newOperand, newOperand->
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kindOfOperand);
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}
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currentEnvironment = saveEnvironment;
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}
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} else {
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expansionOff();
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if(!isUndefined(value = evaluateIdentifier(identifier,
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isTopLevel, NO_FIXUP_OK)) && value->kindOfValue !=
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RELOCATABLE_VALUE) {
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expansionOn();
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result->kindOfTerm = VALUE_EXPR;
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result->expressionTerm.valueUnion = value;
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expand((context->usage==MVARIABLE_SYMBOL ||
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context->usage==VARIABLE_SYMBOL ||
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context->usage==MDEFINE_SYMBOL) ?
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moreExpression("0x%x", value->value) :
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moreExpression("%s", symbName(identifier)));
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} else {
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expansionOn();
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expand(moreExpression("%s", symbName(identifier)));
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}
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}
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break;
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case FUNCTION_CALL_EXPR:
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if ((result->expressionTerm.functionCallUnion =
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duplicateFunctionCall(expression->
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expressionTerm.functionCallUnion)) == NULL)
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result = NULL;
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break;
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case NUMBER_EXPR:
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expand(moreExpression("0x%x", result->expressionTerm.numberUnion));
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/* keep unchanged */
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break;
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case SUBEXPRESSION_EXPR:
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expand(moreExpression("("));
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if ((result->expressionTerm.subexpressionUnion =
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duplicateExpressionForFixup(expression->
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expressionTerm.subexpressionUnion,
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isTopLevel, FALSE)) == NULL)
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result = NULL;
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expand(moreExpression(")"));
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break;
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case UNOP_EXPR:
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expand(moreExpression("%s", tokenString(expression->expressionTerm.
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unopUnion->unop)));
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result->expressionTerm.unopUnion = typeAlloc(unopTermType);
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result->expressionTerm.unopUnion->unop = expression->expressionTerm.
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unopUnion->unop;
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if ((result->expressionTerm.unopUnion->unopArgument =
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duplicateExpressionForFixup(expression->
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expressionTerm.unopUnion->unopArgument,
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FALSE, FALSE)) == NULL)
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result = NULL;
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break;
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case BINOP_EXPR:
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result->expressionTerm.binopUnion = typeAlloc(binopTermType);
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result->expressionTerm.binopUnion->binop = expression->expressionTerm.
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binopUnion->binop;
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if ((result->expressionTerm.binopUnion->leftArgument =
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duplicateExpressionForFixup(expression->
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expressionTerm.binopUnion->leftArgument,
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FALSE, FALSE)) == NULL) {
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expand(moreExpression("*fail*"));
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result = NULL;
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} else {
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expand(moreExpression("%s", tokenString(expression->
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expressionTerm.binopUnion->binop)));
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if ((result->expressionTerm.binopUnion->rightArgument =
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duplicateExpressionForFixup(expression->
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expressionTerm.binopUnion->rightArgument,
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FALSE, FALSE)) == NULL) {
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result = NULL;
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expand(moreExpression("*fail*"));
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}
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}
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break;
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case PREOP_EXPR:
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expand(moreExpression("*fail*"));
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error(CANT_USE_PREOP_WITH_FORWARD_REFERENCE_ERROR, tokenString(
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expression->expressionTerm.preOpUnion->preOp));
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result = NULL;
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break;
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case POSTOP_EXPR:
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expand(moreExpression("*fail*"));
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error(CANT_USE_POSTOP_WITH_FORWARD_REFERENCE_ERROR, tokenString(
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expression->expressionTerm.postOpUnion->postOp));
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result = NULL;
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break;
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case HERE_EXPR:
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result->kindOfTerm = VALUE_EXPR;
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result->expressionTerm.valueUnion = evaluateHere();
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expand(moreExpression("0x%x", result->expressionTerm.valueUnion->
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value));
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break;
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case ASSIGN_EXPR:
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expand(moreExpression("*fail*"));
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error(CANT_USE_ASSIGNMENT_WITH_FORWARD_REFERENCE_ERROR);
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result = NULL;
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break;
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case CONDITION_CODE_EXPR:
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/* keep unchanged */
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expand(moreExpression("%s", conditionString(expression->
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expressionTerm.conditionCodeUnion)));
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break;
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case VALUE_EXPR:
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/* keep unchanged */
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expand(moreExpression("0x%x", expression->expressionTerm.valueUnion->
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value));
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break;
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case ARRAY_EXPR:
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result = duplicateArrayReference(expression->expressionTerm.
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arrayUnion);
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break;
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default:
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botch("duplicateExpression: funny expression kind %d\n",
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expression->kindOfTerm);
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break;
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}
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return(result);
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}
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functionCallTermType *
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duplicateFunctionCall(functionCall)
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functionCallTermType *functionCall;
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{
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functionCallTermType *result;
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operandListType **argument;
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operandListType *parameterList;
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operandListType *duplicateOperandForFixup();
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result = typeAlloc(functionCallTermType);
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result->functionName = functionCall->functionName;
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expand(moreExpression("%s(", symbName(functionCall->functionName)));
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result->parameters = NULL;
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parameterList = functionCall->parameters;
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argument = &(result->parameters);
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while (parameterList != NULL) {
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*argument = duplicateOperandForFixup(parameterList,
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(functionCall->functionName->context->attributes &
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SPECIAL_FUNCTION_ATT) != 0);
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(*argument)->nextOperand = NULL;
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argument = &((*argument)->nextOperand);
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parameterList = parameterList->nextOperand;
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expand(parameterList != NULL ? moreExpression(", ") : 0);
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}
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expand(moreExpression(")"));
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return(result);
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}
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expressionType *
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duplicateArrayReference(arrayTerm)
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arrayTermType *arrayTerm;
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{
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anyOldThing *resultThing;
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valueKindType kindOfResult;
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expressionType *result;
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stringType *charPtr;
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valueType **valuePtr;
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environmentType *saveEnvironment;
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bool saveExpansion;
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operandType *newOperand;
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valueType *newValue();
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operandType *duplicateOperandForFixup();
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anyOldThing *arrayLookup();
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expansionOff();
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resultThing = arrayLookup(arrayTerm, &kindOfResult);
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expansionOn();
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if (*(valueType **)resultThing == NULL) {
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error(VALUELESS_ARRAY_ELEMENT_ERROR);
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result = NULL;
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} else if (kindOfResult == FAIL) {
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result = NULL;
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} else if (kindOfResult == STRING_VALUE) {
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charPtr = (stringType *)resultThing;
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result = typeAlloc(expressionType);
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result->kindOfTerm = VALUE_EXPR;
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result->expressionTerm.valueUnion = newValue(ABSOLUTE_VALUE,
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*charPtr, EXPRESSION_OPND);
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} else {
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valuePtr = (valueType **) resultThing;
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if ((*valuePtr)->kindOfValue == OPERAND_VALUE) {
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saveEnvironment = currentEnvironment;
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currentEnvironment = currentEnvironment->
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previousEnvironment;
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if ((newOperand = duplicateOperandForFixup((*
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valuePtr)->value, FALSE)) == NULL) {
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result = NULL;
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} else {
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result = typeAlloc(expressionType);
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result->kindOfTerm = VALUE_EXPR;
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result->expressionTerm.valueUnion = newValue(
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OPERAND_VALUE, newOperand,
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newOperand->kindOfOperand);
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}
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currentEnvironment = saveEnvironment;
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} else {
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result = typeAlloc(expressionType);
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result->kindOfTerm = VALUE_EXPR;
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dupValue(result->expressionTerm.valueUnion,*valuePtr);
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}
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}
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return(result);
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}
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