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/*
* Anarres C Preprocessor
* Copyright (c) 2007-2015, Shevek
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
package org.anarres.cpp;
import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.Stack;
import java.util.TreeMap;
import javax.annotation.CheckForNull;
import javax.annotation.Nonnull;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import static org.anarres.cpp.PreprocessorCommand.*;
import org.anarres.cpp.PreprocessorListener.SourceChangeEvent;
import static org.anarres.cpp.Token.*;
/**
* A C Preprocessor.
* The Preprocessor outputs a token stream which does not need
* re-lexing for C or C++. Alternatively, the output text may be
* reconstructed by concatenating the {@link Token#getText() text}
* values of the returned {@link Token Tokens}. (See
* {@link CppReader}, which does this.)
*/
/*
* Source file name and line number information is conveyed by lines of the form
*
* # linenum filename flags
*
* These are called linemarkers. They are inserted as needed into
* the output (but never within a string or character constant). They
* mean that the following line originated in file filename at line
* linenum. filename will never contain any non-printing characters;
* they are replaced with octal escape sequences.
*
* After the file name comes zero or more flags, which are `1', `2',
* `3', or `4'. If there are multiple flags, spaces separate them. Here
* is what the flags mean:
*
* `1'
* This indicates the start of a new file.
* `2'
* This indicates returning to a file (after having included another
* file).
* `3'
* This indicates that the following text comes from a system header
* file, so certain warnings should be suppressed.
* `4'
* This indicates that the following text should be treated as being
* wrapped in an implicit extern "C" block.
*/
public class Preprocessor implements Closeable {
private static final Logger LOG = LoggerFactory.getLogger(Preprocessor.class);
private static final Source INTERNAL = new Source() {
@Override
public Token token()
throws IOException,
LexerException {
throw new LexerException("Cannot read from " + getName());
}
@Override
public String getPath() {
return "";
}
@Override
public String getName() {
return "internal data";
}
};
private static final Macro __LINE__ = new Macro(INTERNAL, "__LINE__");
private static final Macro __FILE__ = new Macro(INTERNAL, "__FILE__");
private static final Macro __COUNTER__ = new Macro(INTERNAL, "__COUNTER__");
private final List inputs;
/* The fundamental engine. */
private final Map macros;
private final Stack states;
private Source source;
/* Miscellaneous support. */
private int counter;
private final Set onceseenpaths = new HashSet();
private final List includes = new ArrayList();
/* Support junk to make it work like cpp */
private List quoteincludepath; /* -iquote */
private List sysincludepath; /* -I */
private List frameworkspath;
private final Set features;
private final Set warnings;
private VirtualFileSystem filesystem;
private PreprocessorListener listener;
public Preprocessor() {
this.inputs = new ArrayList();
this.macros = new HashMap();
macros.put(__LINE__.getName(), __LINE__);
macros.put(__FILE__.getName(), __FILE__);
macros.put(__COUNTER__.getName(), __COUNTER__);
this.states = new Stack();
states.push(new State());
this.source = null;
this.counter = 0;
this.quoteincludepath = new ArrayList();
this.sysincludepath = new ArrayList();
this.frameworkspath = new ArrayList();
this.features = EnumSet.noneOf(Feature.class);
this.warnings = EnumSet.noneOf(Warning.class);
this.filesystem = new JavaFileSystem();
this.listener = null;
}
public Preprocessor(@Nonnull Source initial) {
this();
addInput(initial);
}
/** Equivalent to
* 'new Preprocessor(new {@link FileLexerSource}(file))'
*/
public Preprocessor(@Nonnull File file)
throws IOException {
this(new FileLexerSource(file));
}
/**
* Sets the VirtualFileSystem used by this Preprocessor.
*/
public void setFileSystem(@Nonnull VirtualFileSystem filesystem) {
this.filesystem = filesystem;
}
/**
* Returns the VirtualFileSystem used by this Preprocessor.
*/
@Nonnull
public VirtualFileSystem getFileSystem() {
return filesystem;
}
/**
* Sets the PreprocessorListener which handles events for
* this Preprocessor.
*
* The listener is notified of warnings, errors and source
* changes, amongst other things.
*/
public void setListener(@Nonnull PreprocessorListener listener) {
this.listener = listener;
Source s = source;
while (s != null) {
// s.setListener(listener);
s.init(this);
s = s.getParent();
}
}
/**
* Returns the PreprocessorListener which handles events for
* this Preprocessor.
*/
@Nonnull
public PreprocessorListener getListener() {
return listener;
}
/**
* Returns the feature-set for this Preprocessor.
*
* This set may be freely modified by user code.
*/
@Nonnull
public Set getFeatures() {
return features;
}
/**
* Adds a feature to the feature-set of this Preprocessor.
*/
public void addFeature(@Nonnull Feature f) {
features.add(f);
}
/**
* Adds features to the feature-set of this Preprocessor.
*/
public void addFeatures(@Nonnull Collection f) {
features.addAll(f);
}
/**
* Adds features to the feature-set of this Preprocessor.
*/
public void addFeatures(Feature... f) {
addFeatures(Arrays.asList(f));
}
/**
* Returns true if the given feature is in
* the feature-set of this Preprocessor.
*/
public boolean getFeature(@Nonnull Feature f) {
return features.contains(f);
}
/**
* Returns the warning-set for this Preprocessor.
*
* This set may be freely modified by user code.
*/
@Nonnull
public Set getWarnings() {
return warnings;
}
/**
* Adds a warning to the warning-set of this Preprocessor.
*/
public void addWarning(@Nonnull Warning w) {
warnings.add(w);
}
/**
* Adds warnings to the warning-set of this Preprocessor.
*/
public void addWarnings(@Nonnull Collection w) {
warnings.addAll(w);
}
/**
* Returns true if the given warning is in
* the warning-set of this Preprocessor.
*/
public boolean getWarning(@Nonnull Warning w) {
return warnings.contains(w);
}
/**
* Adds input for the Preprocessor.
*
* Inputs are processed in the order in which they are added.
*/
public void addInput(@Nonnull Source source) {
source.init(this);
inputs.add(source);
}
/**
* Adds input for the Preprocessor.
*
* @see #addInput(Source)
*/
public void addInput(@Nonnull File file)
throws IOException {
addInput(new FileLexerSource(file));
}
/**
* Handles an error.
*
* If a PreprocessorListener is installed, it receives the
* error. Otherwise, an exception is thrown.
*/
protected void error(int line, int column, @Nonnull String msg)
throws LexerException {
if (listener != null)
listener.handleError(source, line, column, msg);
else
throw new LexerException("Error at " + line + ":" + column + ": " + msg);
}
/**
* Handles an error.
*
* If a PreprocessorListener is installed, it receives the
* error. Otherwise, an exception is thrown.
*
* @see #error(int, int, String)
*/
protected void error(@Nonnull Token tok, @Nonnull String msg)
throws LexerException {
error(tok.getLine(), tok.getColumn(), msg);
}
/**
* Handles a warning.
*
* If a PreprocessorListener is installed, it receives the
* warning. Otherwise, an exception is thrown.
*/
protected void warning(int line, int column, @Nonnull String msg)
throws LexerException {
if (warnings.contains(Warning.ERROR))
error(line, column, msg);
else if (listener != null)
listener.handleWarning(source, line, column, msg);
else
throw new LexerException("Warning at " + line + ":" + column + ": " + msg);
}
/**
* Handles a warning.
*
* If a PreprocessorListener is installed, it receives the
* warning. Otherwise, an exception is thrown.
*
* @see #warning(int, int, String)
*/
protected void warning(@Nonnull Token tok, @Nonnull String msg)
throws LexerException {
warning(tok.getLine(), tok.getColumn(), msg);
}
/**
* Adds a Macro to this Preprocessor.
*
* The given {@link Macro} object encapsulates both the name
* and the expansion.
*
* @throws LexerException if the definition fails or is otherwise illegal.
*/
public void addMacro(@Nonnull Macro m) throws LexerException {
// System.out.println("Macro " + m);
String name = m.getName();
/* Already handled as a source error in macro(). */
if ("defined".equals(name))
throw new LexerException("Cannot redefine name 'defined'");
macros.put(m.getName(), m);
}
/**
* Defines the given name as a macro.
*
* The String value is lexed into a token stream, which is
* used as the macro expansion.
*
* @throws LexerException if the definition fails or is otherwise illegal.
*/
public void addMacro(@Nonnull String name, @Nonnull String value)
throws LexerException {
try {
Macro m = new Macro(name);
StringLexerSource s = new StringLexerSource(value);
for (;;) {
Token tok = s.token();
if (tok.getType() == EOF)
break;
m.addToken(tok);
}
addMacro(m);
} catch (IOException e) {
throw new LexerException(e);
}
}
/**
* Defines the given name as a macro, with the value 1.
*
* This is a convnience method, and is equivalent to
* addMacro(name, "1").
*
* @throws LexerException if the definition fails or is otherwise illegal.
*/
public void addMacro(@Nonnull String name)
throws LexerException {
addMacro(name, "1");
}
/**
* Sets the user include path used by this Preprocessor.
*/
/* Note for future: Create an IncludeHandler? */
public void setQuoteIncludePath(@Nonnull List path) {
this.quoteincludepath = path;
}
/**
* Returns the user include-path of this Preprocessor.
*
* This list may be freely modified by user code.
*/
@Nonnull
public List getQuoteIncludePath() {
return quoteincludepath;
}
/**
* Sets the system include path used by this Preprocessor.
*/
/* Note for future: Create an IncludeHandler? */
public void setSystemIncludePath(@Nonnull List path) {
this.sysincludepath = path;
}
/**
* Returns the system include-path of this Preprocessor.
*
* This list may be freely modified by user code.
*/
@Nonnull
public List getSystemIncludePath() {
return sysincludepath;
}
/**
* Sets the Objective-C frameworks path used by this Preprocessor.
*/
/* Note for future: Create an IncludeHandler? */
public void setFrameworksPath(@Nonnull List path) {
this.frameworkspath = path;
}
/**
* Returns the Objective-C frameworks path used by this
* Preprocessor.
*
* This list may be freely modified by user code.
*/
@Nonnull
public List getFrameworksPath() {
return frameworkspath;
}
/**
* Returns the Map of Macros parsed during the run of this
* Preprocessor.
*
* @return The {@link Map} of macros currently defined.
*/
@Nonnull
public Map getMacros() {
return macros;
}
/**
* Returns the named macro.
*
* While you can modify the returned object, unexpected things
* might happen if you do.
*
* @return the Macro object, or null if not found.
*/
@CheckForNull
public Macro getMacro(@Nonnull String name) {
return macros.get(name);
}
/**
* Returns the list of {@link VirtualFile VirtualFiles} which have been
* included by this Preprocessor.
*
* This does not include any {@link Source} provided to the constructor
* or {@link #addInput(java.io.File)} or {@link #addInput(Source)}.
*/
@Nonnull
public List getIncludes() {
return includes;
}
/* States */
private void push_state() {
State top = states.peek();
states.push(new State(top));
}
private void pop_state()
throws LexerException {
State s = states.pop();
if (states.isEmpty()) {
error(0, 0, "#" + "endif without #" + "if");
states.push(s);
}
}
private boolean isActive() {
State state = states.peek();
return state.isParentActive() && state.isActive();
}
/* Sources */
/**
* Returns the top Source on the input stack.
*
* @see Source
* @see #push_source(Source,boolean)
* @see #pop_source()
*
* @return the top Source on the input stack.
*/
// @CheckForNull
protected Source getSource() {
return source;
}
/**
* Pushes a Source onto the input stack.
*
* @param source the new Source to push onto the top of the input stack.
* @param autopop if true, the Source is automatically removed from the input stack at EOF.
* @see #getSource()
* @see #pop_source()
*/
protected void push_source(@Nonnull Source source, boolean autopop) {
source.init(this);
source.setParent(this.source, autopop);
// source.setListener(listener);
if (listener != null)
listener.handleSourceChange(this.source, SourceChangeEvent.SUSPEND);
this.source = source;
if (listener != null)
listener.handleSourceChange(this.source, SourceChangeEvent.PUSH);
}
/**
* Pops a Source from the input stack.
*
* @see #getSource()
* @see #push_source(Source,boolean)
*
* @param linemarker TODO: currently ignored, might be a bug?
* @throws IOException if an I/O error occurs.
*/
@CheckForNull
protected Token pop_source(boolean linemarker)
throws IOException {
if (listener != null)
listener.handleSourceChange(this.source, SourceChangeEvent.POP);
Source s = this.source;
this.source = s.getParent();
/* Always a noop unless called externally. */
s.close();
if (listener != null && this.source != null)
listener.handleSourceChange(this.source, SourceChangeEvent.RESUME);
Source t = getSource();
if (getFeature(Feature.LINEMARKERS)
&& s.isNumbered()
&& t != null) {
/* We actually want 'did the nested source
* contain a newline token', which isNumbered()
* approximates. This is not perfect, but works. */
return line_token(t.getLine(), t.getName(), " 2");
}
return null;
}
protected void pop_source()
throws IOException {
pop_source(false);
}
@Nonnull
private Token next_source() {
if (inputs.isEmpty())
return new Token(EOF);
Source s = inputs.remove(0);
push_source(s, true);
return line_token(s.getLine(), s.getName(), " 1");
}
/* Source tokens */
private Token source_token;
/* XXX Make this include the NL, and make all cpp directives eat
* their own NL. */
@Nonnull
private Token line_token(int line, @CheckForNull String name, @Nonnull String extra) {
StringBuilder buf = new StringBuilder();
buf.append("#line ").append(line)
.append(" \"");
/* XXX This call to escape(name) is correct but ugly. */
if (name == null)
buf.append("");
else
MacroTokenSource.escape(buf, name);
buf.append("\"").append(extra).append("\n");
return new Token(P_LINE, line, 0, buf.toString(), null);
}
@Nonnull
private Token source_token()
throws IOException,
LexerException {
if (source_token != null) {
Token tok = source_token;
source_token = null;
if (getFeature(Feature.DEBUG))
LOG.debug("Returning unget token " + tok);
return tok;
}
for (;;) {
Source s = getSource();
if (s == null) {
Token t = next_source();
if (t.getType() == P_LINE && !getFeature(Feature.LINEMARKERS))
continue;
return t;
}
Token tok = s.token();
/* XXX Refactor with skipline() */
if (tok.getType() == EOF && s.isAutopop()) {
// System.out.println("Autopop " + s);
Token mark = pop_source(true);
if (mark != null)
return mark;
continue;
}
if (getFeature(Feature.DEBUG))
LOG.debug("Returning fresh token " + tok);
return tok;
}
}
private void source_untoken(Token tok) {
if (this.source_token != null)
throw new IllegalStateException("Cannot return two tokens");
this.source_token = tok;
}
private boolean isWhite(Token tok) {
int type = tok.getType();
return (type == WHITESPACE)
|| (type == CCOMMENT)
|| (type == CPPCOMMENT);
}
private Token source_token_nonwhite()
throws IOException,
LexerException {
Token tok;
do {
tok = source_token();
} while (isWhite(tok));
return tok;
}
/**
* Returns an NL or an EOF token.
*
* The metadata on the token will be correct, which is better
* than generating a new one.
*
* This method can, as of recent patches, return a P_LINE token.
*/
private Token source_skipline(boolean white)
throws IOException,
LexerException {
// (new Exception("skipping line")).printStackTrace(System.out);
Source s = getSource();
Token tok = s.skipline(white);
/* XXX Refactor with source_token() */
if (tok.getType() == EOF && s.isAutopop()) {
// System.out.println("Autopop " + s);
Token mark = pop_source(true);
if (mark != null)
return mark;
}
return tok;
}
/* processes and expands a macro. */
private boolean macro(Macro m, Token orig)
throws IOException,
LexerException {
Token tok;
List args;
// System.out.println("pp: expanding " + m);
if (m.isFunctionLike()) {
OPEN:
for (;;) {
tok = source_token();
// System.out.println("pp: open: token is " + tok);
switch (tok.getType()) {
case WHITESPACE: /* XXX Really? */
case CCOMMENT:
case CPPCOMMENT:
case NL:
break; /* continue */
case '(':
break OPEN;
default:
source_untoken(tok);
return false;
}
}
// tok = expanded_token_nonwhite();
tok = source_token_nonwhite();
/* We either have, or we should have args.
* This deals elegantly with the case that we have
* one empty arg. */
if (tok.getType() != ')' || m.getArgs() > 0) {
args = new ArrayList();
Argument arg = new Argument();
int depth = 0;
boolean space = false;
ARGS:
for (;;) {
// System.out.println("pp: arg: token is " + tok);
switch (tok.getType()) {
case EOF:
error(tok, "EOF in macro args");
return false;
case ',':
if (depth == 0) {
if (m.isVariadic()
&& /* We are building the last arg. */ args.size() == m.getArgs() - 1) {
/* Just add the comma. */
arg.addToken(tok);
} else {
args.add(arg);
arg = new Argument();
}
} else {
arg.addToken(tok);
}
space = false;
break;
case ')':
if (depth == 0) {
args.add(arg);
break ARGS;
} else {
depth--;
arg.addToken(tok);
}
space = false;
break;
case '(':
depth++;
arg.addToken(tok);
space = false;
break;
case WHITESPACE:
case CCOMMENT:
case CPPCOMMENT:
case NL:
/* Avoid duplicating spaces. */
space = true;
break;
default:
/* Do not put space on the beginning of
* an argument token. */
if (space && !arg.isEmpty())
arg.addToken(Token.space);
arg.addToken(tok);
space = false;
break;
}
// tok = expanded_token();
tok = source_token();
}
/* space may still be true here, thus trailing space
* is stripped from arguments. */
if (args.size() != m.getArgs()) {
if (m.isVariadic()) {
if (args.size() == m.getArgs() - 1) {
args.add(new Argument());
} else {
error(tok,
"variadic macro " + m.getName()
+ " has at least " + (m.getArgs() - 1) + " parameters "
+ "but given " + args.size() + " args");
return false;
}
} else {
error(tok,
"macro " + m.getName()
+ " has " + m.getArgs() + " parameters "
+ "but given " + args.size() + " args");
/* We could replay the arg tokens, but I
* note that GNU cpp does exactly what we do,
* i.e. output the macro name and chew the args.
*/
return false;
}
}
for (Argument a : args) {
a.expand(this);
}
// System.out.println("Macro " + m + " args " + args);
} else {
/* nargs == 0 and we (correctly) got () */
args = null;
}
} else {
/* Macro without args. */
args = null;
}
if (m == __LINE__) {
push_source(new FixedTokenSource(
new Token[]{new Token(NUMBER,
orig.getLine(), orig.getColumn(),
Integer.toString(orig.getLine()),
new NumericValue(10, Integer.toString(orig.getLine())))}
), true);
} else if (m == __FILE__) {
StringBuilder buf = new StringBuilder("\"");
String name = getSource().getName();
if (name == null)
name = "";
for (int i = 0; i < name.length(); i++) {
char c = name.charAt(i);
switch (c) {
case '\\':
buf.append("\\\\");
break;
case '"':
buf.append("\\\"");
break;
default:
buf.append(c);
break;
}
}
buf.append("\"");
String text = buf.toString();
push_source(new FixedTokenSource(
new Token[]{new Token(STRING,
orig.getLine(), orig.getColumn(),
text, text)}
), true);
} else if (m == __COUNTER__) {
/* This could equivalently have been done by adding
* a special Macro subclass which overrides getTokens(). */
int value = this.counter++;
push_source(new FixedTokenSource(
new Token[]{new Token(NUMBER,
orig.getLine(), orig.getColumn(),
Integer.toString(value),
new NumericValue(10, Integer.toString(value)))}
), true);
} else {
push_source(new MacroTokenSource(m, args), true);
}
return true;
}
/**
* Expands an argument.
*/
/* I'd rather this were done lazily, but doing so breaks spec. */
@Nonnull
/* pp */ List expand(@Nonnull List arg)
throws IOException,
LexerException {
List expansion = new ArrayList();
boolean space = false;
push_source(new FixedTokenSource(arg), false);
EXPANSION:
for (;;) {
Token tok = expanded_token();
switch (tok.getType()) {
case EOF:
break EXPANSION;
case WHITESPACE:
case CCOMMENT:
case CPPCOMMENT:
space = true;
break;
default:
if (space && !expansion.isEmpty())
expansion.add(Token.space);
expansion.add(tok);
space = false;
break;
}
}
// Always returns null.
pop_source(false);
return expansion;
}
/* processes a #define directive */
private Token define()
throws IOException,
LexerException {
Token tok = source_token_nonwhite();
if (tok.getType() != IDENTIFIER) {
error(tok, "Expected identifier");
return source_skipline(false);
}
/* if predefined */
String name = tok.getText();
if ("defined".equals(name)) {
error(tok, "Cannot redefine name 'defined'");
return source_skipline(false);
}
Macro m = new Macro(getSource(), name);
List args;
tok = source_token();
if (tok.getType() == '(') {
tok = source_token_nonwhite();
if (tok.getType() != ')') {
args = new ArrayList();
ARGS:
for (;;) {
switch (tok.getType()) {
case IDENTIFIER:
args.add(tok.getText());
break;
case ELLIPSIS:
// Unnamed Variadic macro
args.add("__VA_ARGS__");
// We just named the ellipsis, but we unget the token
// to allow the ELLIPSIS handling below to process it.
source_untoken(tok);
break;
case NL:
case EOF:
error(tok,
"Unterminated macro parameter list");
return tok;
default:
error(tok,
"error in macro parameters: "
+ tok.getText());
return source_skipline(false);
}
tok = source_token_nonwhite();
switch (tok.getType()) {
case ',':
break;
case ELLIPSIS:
tok = source_token_nonwhite();
if (tok.getType() != ')')
error(tok,
"ellipsis must be on last argument");
m.setVariadic(true);
break ARGS;
case ')':
break ARGS;
case NL:
case EOF:
/* Do not skip line. */
error(tok,
"Unterminated macro parameters");
return tok;
default:
error(tok,
"Bad token in macro parameters: "
+ tok.getText());
return source_skipline(false);
}
tok = source_token_nonwhite();
}
} else {
assert tok.getType() == ')' : "Expected ')'";
args = Collections.emptyList();
}
m.setArgs(args);
} else {
/* For searching. */
args = Collections.emptyList();
source_untoken(tok);
}
/* Get an expansion for the macro, using indexOf. */
boolean space = false;
boolean paste = false;
int idx;
/* Ensure no space at start. */
tok = source_token_nonwhite();
EXPANSION:
for (;;) {
switch (tok.getType()) {
case EOF:
break EXPANSION;
case NL:
break EXPANSION;
case CCOMMENT:
case CPPCOMMENT:
/* XXX This is where we implement GNU's cpp -CC. */
// break;
case WHITESPACE:
if (!paste)
space = true;
break;
/* Paste. */
case PASTE:
space = false;
paste = true;
m.addPaste(new Token(M_PASTE,
tok.getLine(), tok.getColumn(),
"#" + "#", null));
break;
/* Stringify. */
case '#':
if (space)
m.addToken(Token.space);
space = false;
Token la = source_token_nonwhite();
if (la.getType() == IDENTIFIER
&& ((idx = args.indexOf(la.getText())) != -1)) {
m.addToken(new Token(M_STRING,
la.getLine(), la.getColumn(),
"#" + la.getText(),
Integer.valueOf(idx)));
} else {
m.addToken(tok);
/* Allow for special processing. */
source_untoken(la);
}
break;
case IDENTIFIER:
if (space)
m.addToken(Token.space);
space = false;
paste = false;
idx = args.indexOf(tok.getText());
if (idx == -1)
m.addToken(tok);
else
m.addToken(new Token(M_ARG,
tok.getLine(), tok.getColumn(),
tok.getText(),
Integer.valueOf(idx)));
break;
default:
if (space)
m.addToken(Token.space);
space = false;
paste = false;
m.addToken(tok);
break;
}
tok = source_token();
}
if (getFeature(Feature.DEBUG))
LOG.debug("Defined macro " + m);
addMacro(m);
return tok; /* NL or EOF. */
}
@Nonnull
private Token undef()
throws IOException,
LexerException {
Token tok = source_token_nonwhite();
if (tok.getType() != IDENTIFIER) {
error(tok,
"Expected identifier, not " + tok.getText());
if (tok.getType() == NL || tok.getType() == EOF)
return tok;
} else {
Macro m = getMacro(tok.getText());
if (m != null) {
/* XXX error if predefined */
macros.remove(m.getName());
}
}
return source_skipline(true);
}
/**
* Attempts to include the given file.
*
* User code may override this method to implement a virtual
* file system.
*
* @param file The VirtualFile to attempt to include.
* @return true if the file was successfully included, false otherwise.
* @throws IOException if an I/O error occurs.
*/
protected boolean include(@Nonnull VirtualFile file)
throws IOException {
// System.out.println("Try to include " + ((File)file).getAbsolutePath());
if (!file.isFile())
return false;
if (getFeature(Feature.DEBUG))
LOG.debug("pp: including " + file);
includes.add(file);
push_source(file.getSource(), true);
return true;
}
/**
* Attempts to include a file from an include path, by name.
*
* @param path The list of virtual directories to search for the given name.
* @param name The name of the file to attempt to include.
* @return true if the file was successfully included, false otherwise.
* @throws IOException if an I/O error occurs.
*/
protected boolean include(@Nonnull Iterable path, @Nonnull String name)
throws IOException {
for (String dir : path) {
VirtualFile file = getFileSystem().getFile(dir, name);
if (include(file))
return true;
}
return false;
}
/**
* Handles an include directive.
*
* @throws IOException if an I/O error occurs.
* @throws LexerException if the include fails, and the error handler is fatal.
*/
private void include(
@CheckForNull String parent, int line,
@Nonnull String name, boolean quoted, boolean next)
throws IOException,
LexerException {
if (name.startsWith("/")) {
VirtualFile file = filesystem.getFile(name);
if (include(file))
return;
StringBuilder buf = new StringBuilder();
buf.append("File not found: ").append(name);
error(line, 0, buf.toString());
return;
}
VirtualFile pdir = null;
if (quoted) {
if (parent != null) {
VirtualFile pfile = filesystem.getFile(parent);
pdir = pfile.getParentFile();
}
if (pdir != null) {
VirtualFile ifile = pdir.getChildFile(name);
if (include(ifile))
return;
}
if (include(quoteincludepath, name))
return;
} else {
int idx = name.indexOf('/');
if (idx != -1) {
String frameworkName = name.substring(0, idx);
String headerName = name.substring(idx + 1);
String headerPath = frameworkName + ".framework/Headers/" + headerName;
if (include(frameworkspath, headerPath))
return;
}
}
if (include(sysincludepath, name))
return;
StringBuilder buf = new StringBuilder();
buf.append("File not found: ").append(name);
buf.append(" in");
if (quoted) {
buf.append(" .").append('(').append(pdir).append(')');
for (String dir : quoteincludepath)
buf.append(" ").append(dir);
}
for (String dir : sysincludepath)
buf.append(" ").append(dir);
error(line, 0, buf.toString());
}
@Nonnull
private Token include(boolean next)
throws IOException,
LexerException {
LexerSource lexer = (LexerSource) source;
try {
lexer.setInclude(true);
Token tok = token_nonwhite();
String name;
boolean quoted;
if (tok.getType() == STRING) {
/* XXX Use the original text, not the value.
* Backslashes must not be treated as escapes here. */
StringBuilder buf = new StringBuilder((String) tok.getValue());
HEADER:
for (;;) {
tok = token_nonwhite();
switch (tok.getType()) {
case STRING:
buf.append((String) tok.getValue());
break;
case NL:
case EOF:
break HEADER;
default:
warning(tok,
"Unexpected token on #" + "include line");
return source_skipline(false);
}
}
name = buf.toString();
quoted = true;
} else if (tok.getType() == HEADER) {
name = (String) tok.getValue();
quoted = false;
tok = source_skipline(true);
} else {
error(tok,
"Expected string or header, not " + tok.getText());
switch (tok.getType()) {
case NL:
case EOF:
return tok;
default:
/* Only if not a NL or EOF already. */
return source_skipline(false);
}
}
/* Do the inclusion. */
include(source.getPath(), tok.getLine(), name, quoted, next);
/* 'tok' is the 'nl' after the include. We use it after the
* #line directive. */
if (getFeature(Feature.LINEMARKERS))
return line_token(1, source.getName(), " 1");
return tok;
} finally {
lexer.setInclude(false);
}
}
protected void pragma_once(@Nonnull Token name)
throws IOException, LexerException {
Source s = this.source;
if (!onceseenpaths.add(s.getPath())) {
Token mark = pop_source(true);
// FixedTokenSource should never generate a linemarker on exit.
if (mark != null)
push_source(new FixedTokenSource(Arrays.asList(mark)), true);
}
}
protected void pragma(@Nonnull Token name, @Nonnull List value)
throws IOException,
LexerException {
if (getFeature(Feature.PRAGMA_ONCE)) {
if ("once".equals(name.getText())) {
pragma_once(name);
return;
}
}
warning(name, "Unknown #" + "pragma: " + name.getText());
}
@Nonnull
private Token pragma()
throws IOException,
LexerException {
Token name;
NAME:
for (;;) {
Token tok = source_token();
switch (tok.getType()) {
case EOF:
/* There ought to be a newline before EOF.
* At least, in any skipline context. */
/* XXX Are we sure about this? */
warning(tok,
"End of file in #" + "pragma");
return tok;
case NL:
/* This may contain one or more newlines. */
warning(tok,
"Empty #" + "pragma");
return tok;
case CCOMMENT:
case CPPCOMMENT:
case WHITESPACE:
continue NAME;
case IDENTIFIER:
name = tok;
break NAME;
default:
warning(tok,
"Illegal #" + "pragma " + tok.getText());
return source_skipline(false);
}
}
Token tok;
List value = new ArrayList();
VALUE:
for (;;) {
tok = source_token();
switch (tok.getType()) {
case EOF:
/* There ought to be a newline before EOF.
* At least, in any skipline context. */
/* XXX Are we sure about this? */
warning(tok,
"End of file in #" + "pragma");
break VALUE;
case NL:
/* This may contain one or more newlines. */
break VALUE;
case CCOMMENT:
case CPPCOMMENT:
break;
case WHITESPACE:
value.add(tok);
break;
default:
value.add(tok);
break;
}
}
pragma(name, value);
return tok; /* The NL. */
}
/* For #error and #warning. */
private void error(@Nonnull Token pptok, boolean is_error)
throws IOException,
LexerException {
StringBuilder buf = new StringBuilder();
buf.append('#').append(pptok.getText()).append(' ');
/* Peculiar construction to ditch first whitespace. */
Token tok = source_token_nonwhite();
ERROR:
for (;;) {
switch (tok.getType()) {
case NL:
case EOF:
break ERROR;
default:
buf.append(tok.getText());
break;
}
tok = source_token();
}
if (is_error)
error(pptok, buf.toString());
else
warning(pptok, buf.toString());
}
/* This bypasses token() for #elif expressions.
* If we don't do this, then isActive() == false
* causes token() to simply chew the entire input line. */
@Nonnull
private Token expanded_token()
throws IOException,
LexerException {
for (;;) {
Token tok = source_token();
// System.out.println("Source token is " + tok);
if (tok.getType() == IDENTIFIER) {
Macro m = getMacro(tok.getText());
if (m == null)
return tok;
if (source.isExpanding(m))
return tok;
if (macro(m, tok))
continue;
}
return tok;
}
}
@Nonnull
private Token expanded_token_nonwhite()
throws IOException,
LexerException {
Token tok;
do {
tok = expanded_token();
// System.out.println("expanded token is " + tok);
} while (isWhite(tok));
return tok;
}
@CheckForNull
private Token expr_token = null;
@Nonnull
private Token expr_token()
throws IOException,
LexerException {
Token tok = expr_token;
if (tok != null) {
// System.out.println("ungetting");
expr_token = null;
} else {
tok = expanded_token_nonwhite();
// System.out.println("expt is " + tok);
if (tok.getType() == IDENTIFIER
&& tok.getText().equals("defined")) {
Token la = source_token_nonwhite();
boolean paren = false;
if (la.getType() == '(') {
paren = true;
la = source_token_nonwhite();
}
// System.out.println("Core token is " + la);
if (la.getType() != IDENTIFIER) {
error(la,
"defined() needs identifier, not "
+ la.getText());
tok = new Token(NUMBER,
la.getLine(), la.getColumn(),
"0", new NumericValue(10, "0"));
} else if (macros.containsKey(la.getText())) {
// System.out.println("Found macro");
tok = new Token(NUMBER,
la.getLine(), la.getColumn(),
"1", new NumericValue(10, "1"));
} else {
// System.out.println("Not found macro");
tok = new Token(NUMBER,
la.getLine(), la.getColumn(),
"0", new NumericValue(10, "0"));
}
if (paren) {
la = source_token_nonwhite();
if (la.getType() != ')') {
expr_untoken(la);
error(la, "Missing ) in defined(). Got " + la.getText());
}
}
}
}
// System.out.println("expr_token returns " + tok);
return tok;
}
private void expr_untoken(@Nonnull Token tok)
throws LexerException {
if (expr_token != null)
throw new InternalException(
"Cannot unget two expression tokens."
);
expr_token = tok;
}
private int expr_priority(@Nonnull Token op) {
switch (op.getType()) {
case '/':
return 11;
case '%':
return 11;
case '*':
return 11;
case '+':
return 10;
case '-':
return 10;
case LSH:
return 9;
case RSH:
return 9;
case '<':
return 8;
case '>':
return 8;
case LE:
return 8;
case GE:
return 8;
case EQ:
return 7;
case NE:
return 7;
case '&':
return 6;
case '^':
return 5;
case '|':
return 4;
case LAND:
return 3;
case LOR:
return 2;
case '?':
return 1;
default:
// System.out.println("Unrecognised operator " + op);
return 0;
}
}
private long expr(int priority)
throws IOException,
LexerException {
/*
* (new Exception("expr(" + priority + ") called")).printStackTrace();
*/
Token tok = expr_token();
long lhs, rhs;
// System.out.println("Expr lhs token is " + tok);
switch (tok.getType()) {
case '(':
lhs = expr(0);
tok = expr_token();
if (tok.getType() != ')') {
expr_untoken(tok);
error(tok, "Missing ) in expression. Got " + tok.getText());
return 0;
}
break;
case '~':
lhs = ~expr(11);
break;
case '!':
lhs = expr(11) == 0 ? 1 : 0;
break;
case '-':
lhs = -expr(11);
break;
case NUMBER:
NumericValue value = (NumericValue) tok.getValue();
lhs = value.longValue();
break;
case CHARACTER:
lhs = ((Character) tok.getValue()).charValue();
break;
case IDENTIFIER:
if (warnings.contains(Warning.UNDEF))
warning(tok, "Undefined token '" + tok.getText()
+ "' encountered in conditional.");
lhs = 0;
break;
default:
expr_untoken(tok);
error(tok,
"Bad token in expression: " + tok.getText());
return 0;
}
EXPR:
for (;;) {
// System.out.println("expr: lhs is " + lhs + ", pri = " + priority);
Token op = expr_token();
int pri = expr_priority(op); /* 0 if not a binop. */
if (pri == 0 || priority >= pri) {
expr_untoken(op);
break EXPR;
}
rhs = expr(pri);
// System.out.println("rhs token is " + rhs);
switch (op.getType()) {
case '/':
if (rhs == 0) {
error(op, "Division by zero");
lhs = 0;
} else {
lhs = lhs / rhs;
}
break;
case '%':
if (rhs == 0) {
error(op, "Modulus by zero");
lhs = 0;
} else {
lhs = lhs % rhs;
}
break;
case '*':
lhs = lhs * rhs;
break;
case '+':
lhs = lhs + rhs;
break;
case '-':
lhs = lhs - rhs;
break;
case '<':
lhs = lhs < rhs ? 1 : 0;
break;
case '>':
lhs = lhs > rhs ? 1 : 0;
break;
case '&':
lhs = lhs & rhs;
break;
case '^':
lhs = lhs ^ rhs;
break;
case '|':
lhs = lhs | rhs;
break;
case LSH:
lhs = lhs << rhs;
break;
case RSH:
lhs = lhs >> rhs;
break;
case LE:
lhs = lhs <= rhs ? 1 : 0;
break;
case GE:
lhs = lhs >= rhs ? 1 : 0;
break;
case EQ:
lhs = lhs == rhs ? 1 : 0;
break;
case NE:
lhs = lhs != rhs ? 1 : 0;
break;
case LAND:
lhs = (lhs != 0) && (rhs != 0) ? 1 : 0;
break;
case LOR:
lhs = (lhs != 0) || (rhs != 0) ? 1 : 0;
break;
case '?': {
tok = expr_token();
if (tok.getType() != ':') {
expr_untoken(tok);
error(tok, "Missing : in conditional expression. Got " + tok.getText());
return 0;
}
long falseResult = expr(0);
lhs = (lhs != 0) ? rhs : falseResult;
}
break;
default:
error(op,
"Unexpected operator " + op.getText());
return 0;
}
}
/*
* (new Exception("expr returning " + lhs)).printStackTrace();
*/
// System.out.println("expr returning " + lhs);
return lhs;
}
@Nonnull
private Token toWhitespace(@Nonnull Token tok) {
String text = tok.getText();
int len = text.length();
boolean cr = false;
int nls = 0;
for (int i = 0; i < len; i++) {
char c = text.charAt(i);
switch (c) {
case '\r':
cr = true;
nls++;
break;
case '\n':
if (cr) {
cr = false;
break;
}
/* fallthrough */
case '\u2028':
case '\u2029':
case '\u000B':
case '\u000C':
case '\u0085':
cr = false;
nls++;
break;
}
}
char[] cbuf = new char[nls];
Arrays.fill(cbuf, '\n');
return new Token(WHITESPACE,
tok.getLine(), tok.getColumn(),
new String(cbuf));
}
@Nonnull
private Token _token()
throws IOException,
LexerException {
for (;;) {
Token tok;
if (!isActive()) {
Source s = getSource();
if (s == null) {
Token t = next_source();
if (t.getType() == P_LINE && !getFeature(Feature.LINEMARKERS))
continue;
return t;
}
try {
/* XXX Tell lexer to ignore warnings. */
s.setActive(false);
tok = source_token();
} finally {
/* XXX Tell lexer to stop ignoring warnings. */
s.setActive(true);
}
switch (tok.getType()) {
case HASH:
case NL:
case EOF:
/* The preprocessor has to take action here. */
break;
case WHITESPACE:
return tok;
case CCOMMENT:
case CPPCOMMENT:
// Patch up to preserve whitespace.
if (getFeature(Feature.KEEPALLCOMMENTS))
return tok;
if (!isActive())
return toWhitespace(tok);
if (getFeature(Feature.KEEPCOMMENTS))
return tok;
return toWhitespace(tok);
default:
// Return NL to preserve whitespace.
/* XXX This might lose a comment. */
return source_skipline(false);
}
} else {
tok = source_token();
}
LEX:
switch (tok.getType()) {
case EOF:
/* Pop the stacks. */
return tok;
case WHITESPACE:
case NL:
return tok;
case CCOMMENT:
case CPPCOMMENT:
return tok;
case '!':
case '%':
case '&':
case '(':
case ')':
case '*':
case '+':
case ',':
case '-':
case '/':
case ':':
case ';':
case '<':
case '=':
case '>':
case '?':
case '[':
case ']':
case '^':
case '{':
case '|':
case '}':
case '~':
case '.':
/* From Olivier Chafik for Objective C? */
case '@':
/* The one remaining ASCII, might as well. */
case '`':
// case '#':
case AND_EQ:
case ARROW:
case CHARACTER:
case DEC:
case DIV_EQ:
case ELLIPSIS:
case EQ:
case GE:
case HEADER: /* Should only arise from include() */
case INC:
case LAND:
case LE:
case LOR:
case LSH:
case LSH_EQ:
case SUB_EQ:
case MOD_EQ:
case MULT_EQ:
case NE:
case OR_EQ:
case PLUS_EQ:
case RANGE:
case RSH:
case RSH_EQ:
case STRING:
case SQSTRING:
case XOR_EQ:
return tok;
case NUMBER:
return tok;
case IDENTIFIER:
Macro m = getMacro(tok.getText());
if (m == null)
return tok;
if (source.isExpanding(m))
return tok;
if (macro(m, tok))
break;
return tok;
case P_LINE:
if (getFeature(Feature.LINEMARKERS))
return tok;
break;
case INVALID:
if (getFeature(Feature.CSYNTAX))
error(tok, String.valueOf(tok.getValue()));
return tok;
default:
throw new InternalException("Bad token " + tok);
// break;
case HASH:
tok = source_token_nonwhite();
// (new Exception("here")).printStackTrace();
switch (tok.getType()) {
case NL:
break LEX; /* Some code has #\n */
case IDENTIFIER:
break;
default:
error(tok,
"Preprocessor directive not a word "
+ tok.getText());
return source_skipline(false);
}
PreprocessorCommand ppcmd = PreprocessorCommand.forText(tok.getText());
if (ppcmd == null) {
error(tok,
"Unknown preprocessor directive "
+ tok.getText());
return source_skipline(false);
}
PP:
switch (ppcmd) {
case PP_DEFINE:
if (!isActive())
return source_skipline(false);
else
return define();
// break;
case PP_UNDEF:
if (!isActive())
return source_skipline(false);
else
return undef();
// break;
case PP_INCLUDE:
if (!isActive())
return source_skipline(false);
else
return include(false);
// break;
case PP_INCLUDE_NEXT:
if (!isActive())
return source_skipline(false);
if (!getFeature(Feature.INCLUDENEXT)) {
error(tok,
"Directive include_next not enabled"
);
return source_skipline(false);
}
return include(true);
// break;
case PP_WARNING:
case PP_ERROR:
if (!isActive())
return source_skipline(false);
else
error(tok, ppcmd == PP_ERROR);
break;
case PP_IF:
push_state();
if (!isActive()) {
return source_skipline(false);
}
expr_token = null;
states.peek().setActive(expr(0) != 0);
tok = expr_token(); /* unget */
if (tok.getType() == NL)
return tok;
return source_skipline(true);
// break;
case PP_ELIF:
State state = states.peek();
if (false) {
/* Check for 'if' */;
} else if (state.sawElse()) {
error(tok,
"#elif after #" + "else");
return source_skipline(false);
} else if (!state.isParentActive()) {
/* Nested in skipped 'if' */
return source_skipline(false);
} else if (state.isActive()) {
/* The 'if' part got executed. */
state.setParentActive(false);
/* This is like # else # if but with
* only one # end. */
state.setActive(false);
return source_skipline(false);
} else {
expr_token = null;
state.setActive(expr(0) != 0);
tok = expr_token(); /* unget */
if (tok.getType() == NL)
return tok;
return source_skipline(true);
}
// break;
case PP_ELSE:
state = states.peek();
if (false)
/* Check for 'if' */ ; else if (state.sawElse()) {
error(tok,
"#" + "else after #" + "else");
return source_skipline(false);
} else {
state.setSawElse();
state.setActive(!state.isActive());
return source_skipline(warnings.contains(Warning.ENDIF_LABELS));
}
// break;
case PP_IFDEF:
push_state();
if (!isActive()) {
return source_skipline(false);
} else {
tok = source_token_nonwhite();
// System.out.println("ifdef " + tok);
if (tok.getType() != IDENTIFIER) {
error(tok,
"Expected identifier, not "
+ tok.getText());
return source_skipline(false);
} else {
String text = tok.getText();
boolean exists
= macros.containsKey(text);
states.peek().setActive(exists);
return source_skipline(true);
}
}
// break;
case PP_IFNDEF:
push_state();
if (!isActive()) {
return source_skipline(false);
} else {
tok = source_token_nonwhite();
if (tok.getType() != IDENTIFIER) {
error(tok,
"Expected identifier, not "
+ tok.getText());
return source_skipline(false);
} else {
String text = tok.getText();
boolean exists
= macros.containsKey(text);
states.peek().setActive(!exists);
return source_skipline(true);
}
}
// break;
case PP_ENDIF:
pop_state();
return source_skipline(warnings.contains(Warning.ENDIF_LABELS));
// break;
case PP_LINE:
return source_skipline(false);
// break;
case PP_PRAGMA:
if (!isActive())
return source_skipline(false);
return pragma();
// break;
default:
/* Actual unknown directives are
* processed above. If we get here,
* we succeeded the map lookup but
* failed to handle it. Therefore,
* this is (unconditionally?) fatal. */
// if (isActive()) /* XXX Could be warning. */
throw new InternalException(
"Internal error: Unknown directive "
+ tok);
// return source_skipline(false);
}
}
}
}
@Nonnull
private Token token_nonwhite()
throws IOException,
LexerException {
Token tok;
do {
tok = _token();
} while (isWhite(tok));
return tok;
}
/**
* Returns the next preprocessor token.
*
* @see Token
* @return The next fully preprocessed token.
* @throws IOException if an I/O error occurs.
* @throws LexerException if a preprocessing error occurs.
* @throws InternalException if an unexpected error condition arises.
*/
@Nonnull
public Token token()
throws IOException,
LexerException {
Token tok = _token();
if (getFeature(Feature.DEBUG))
LOG.debug("pp: Returning " + tok);
return tok;
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder();
Source s = getSource();
while (s != null) {
buf.append(" -> ").append(String.valueOf(s)).append("\n");
s = s.getParent();
}
Map macros = new TreeMap(getMacros());
for (Macro macro : macros.values()) {
buf.append("#").append("macro ").append(macro).append("\n");
}
return buf.toString();
}
@Override
public void close()
throws IOException {
{
Source s = source;
while (s != null) {
s.close();
s = s.getParent();
}
}
for (Source s : inputs) {
s.close();
}
}
}
