private BitSet getParamUsage(PreprocessorMacro macro) {
final BitSet result = new BitSet();
final TokenList replacement = macro.getTokens(fDefinitionParser, fLexOptions, this);
Token l = null;
Token n;
for (Token t = replacement.first(); t != null; l = t, t = n) {
n = (Token) t.getNext();
switch (t.getType()) {
case ObjCPreprocessor.tMACRO_PARAMETER:
int idx = 2 * ((TokenParameterReference) t).getIndex();
if (!isKind(n, IToken.tPOUNDPOUND)) {
idx++;
}
result.set(idx);
break;
case IToken.tPOUND:
if (isKind(n, ObjCPreprocessor.tMACRO_PARAMETER)) {
idx = ((TokenParameterReference) n).getIndex();
result.set(2 * idx);
t = n;
n = (Token) n.getNext();
}
break;
case IToken.tPOUNDPOUND:
if (isKind(n, ObjCPreprocessor.tMACRO_PARAMETER)) {
idx = ((TokenParameterReference) n).getIndex();
// gcc-extension
if (isKind(l, IToken.tCOMMA)
&& macro.hasVarArgs() != FunctionStyleMacro.NO_VAARGS
&& idx == macro.getParameterPlaceholderList().length - 1
&& !isKind(n.getNext(), IToken.tPOUNDPOUND)) {
result.set(2 * idx + 1);
} else {
result.set(2 * idx);
}
t = n;
n = (Token) n.getNext();
}
break;
}
}
return result;
}
/**
* Expects that the identifier of the macro expansion has been consumed. Expands the macro
* consuming tokens from the input (to read the parameters) and stores the resulting tokens
* together with boundary markers in the result token list. Returns the last token of the
* expansion.
*
* @throws AbortMacroExpansionException
*/
private Token expandOne(
Token lastConsumed,
PreprocessorMacro macro,
IdentityHashMap<PreprocessorMacro, PreprocessorMacro> forbidden,
TokenSource input,
TokenList result,
MacroExpansionTracker tracker)
throws OffsetLimitReachedException {
if (macro.isFunctionStyle()) {
final int paramCount = macro.getParameterPlaceholderList().length;
final TokenSource[] argInputs = new TokenSource[paramCount];
final BitSet paramUsage = getParamUsage(macro);
if (tracker != null) {
tracker.startFunctionStyleMacro((Token) lastConsumed.clone());
}
try {
lastConsumed =
parseArguments(input, (FunctionStyleMacro) macro, forbidden, argInputs, tracker);
} catch (AbortMacroExpansionException e) {
// ignore this macro expansion
for (int i = 0; i < argInputs.length; i++) {
TokenSource argInput = argInputs[i];
executeScopeMarkers(argInput, forbidden);
if (tracker != null) {
tracker.setExpandedMacroArgument(null);
}
}
if (tracker != null) {
if (tracker.isRequestedStep()) {
tracker.storeFunctionStyleMacroReplacement(macro, new TokenList(), result);
} else if (tracker.isDone()) {
tracker.appendFunctionStyleMacro(result);
}
tracker.endFunctionStyleMacro();
}
return null;
}
TokenList[] clonedArgs = new TokenList[paramCount];
TokenList[] expandedArgs = new TokenList[paramCount];
for (int i = 0; i < paramCount; i++) {
final TokenSource argInput = argInputs[i];
final boolean needCopy = paramUsage.get(2 * i);
final boolean needExpansion = paramUsage.get(2 * i + 1);
clonedArgs[i] = needCopy ? argInput.cloneTokens() : EMPTY_TOKEN_LIST;
expandedArgs[i] =
needExpansion ? expandAll(argInput, forbidden, false, tracker) : EMPTY_TOKEN_LIST;
if (!needExpansion) {
executeScopeMarkers(argInput, forbidden);
}
if (tracker != null) {
tracker.setExpandedMacroArgument(needExpansion ? expandedArgs[i] : null);
// make sure that the trailing arguments do not get
// expanded.
if (tracker.isDone()) {
paramUsage.clear();
}
}
}
if (tracker == null) {
replaceArgs(macro, clonedArgs, expandedArgs, result);
} else {
if (tracker.isRequestedStep()) {
TokenList replacement = new TokenList();
replaceArgs(macro, clonedArgs, expandedArgs, replacement);
tracker.storeFunctionStyleMacroReplacement(macro, replacement, result);
} else if (tracker.isDone()) {
tracker.appendFunctionStyleMacro(result);
} else {
replaceArgs(macro, clonedArgs, expandedArgs, result);
}
tracker.endFunctionStyleMacro();
}
} else {
if (tracker == null) {
objStyleTokenPaste(macro, result);
} else {
if (tracker.isRequestedStep()) {
TokenList replacement = new TokenList();
objStyleTokenPaste(macro, replacement);
tracker.storeObjectStyleMacroReplacement(macro, lastConsumed, replacement, result);
} else {
objStyleTokenPaste(macro, result);
}
tracker.endObjectStyleMacro();
}
}
return lastConsumed;
}