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org.apache.jasper.compiler.SmapUtil Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.jasper.compiler;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import org.apache.jasper.JasperException;
import org.apache.jasper.JspCompilationContext;
import org.apache.jasper.compiler.SmapStratum.LineInfo;
import org.apache.juli.logging.Log;
import org.apache.juli.logging.LogFactory;
/**
* Contains static utilities for generating SMAP data based on the
* current version of Jasper.
*
* @author Jayson Falkner
* @author Shawn Bayern
* @author Robert Field (inner SDEInstaller class)
* @author Mark Roth
* @author Kin-man Chung
*/
public class SmapUtil {
//*********************************************************************
// Constants
private static final Charset SMAP_ENCODING = StandardCharsets.UTF_8;
//*********************************************************************
// Public entry points
/**
* Generates an appropriate SMAP representing the current compilation
* context. (JSR-045.)
*
* @param ctxt Current compilation context
* @param pageNodes The current JSP page
* @return a SMAP for the page
* @throws IOException Error writing SMAP
*/
public static Map generateSmap(JspCompilationContext ctxt,
Node.Nodes pageNodes) throws IOException {
Map smapInfo = new HashMap<>();
// Scan the nodes for presence of Jasper generated inner classes
PreScanVisitor psVisitor = new PreScanVisitor();
try {
pageNodes.visit(psVisitor);
} catch (JasperException ex) {
}
HashMap map = psVisitor.getMap();
// Assemble info about our own stratum (JSP) using JspLineMap
SmapStratum s = new SmapStratum();
// Map out Node.Nodes
evaluateNodes(pageNodes, s, map, ctxt.getOptions().getMappedFile());
s.optimizeLineSection();
s.setOutputFileName(unqualify(ctxt.getServletJavaFileName()));
String classFileName = ctxt.getClassFileName();
s.setClassFileName(classFileName);
smapInfo.put(ctxt.getFQCN(), s);
if (ctxt.getOptions().isSmapDumped()) {
File outSmap = new File(classFileName + ".smap");
PrintWriter so =
new PrintWriter(
new OutputStreamWriter(
new FileOutputStream(outSmap),
SMAP_ENCODING));
so.print(s.getSmapString());
so.close();
}
for (Map.Entry entry : map.entrySet()) {
String innerClass = entry.getKey();
s = entry.getValue();
s.optimizeLineSection();
s.setOutputFileName(unqualify(ctxt.getServletJavaFileName()));
String innerClassFileName =
classFileName.substring(0, classFileName.indexOf(".class")) +
'$' + innerClass + ".class";
s.setClassFileName(innerClassFileName);
smapInfo.put(ctxt.getFQCN() + "." + innerClass, s);
if (ctxt.getOptions().isSmapDumped()) {
File outSmap = new File(innerClassFileName + ".smap");
PrintWriter so =
new PrintWriter(
new OutputStreamWriter(
new FileOutputStream(outSmap),
SMAP_ENCODING));
so.print(s.getSmapString());
so.close();
}
}
return smapInfo;
}
public static void installSmap(Map smapInfo)
throws IOException {
if (smapInfo == null) {
return;
}
for (Map.Entry entry : smapInfo.entrySet()) {
File outServlet = new File(entry.getValue().getClassFileName());
SDEInstaller.install(outServlet,
entry.getValue().getSmapString().getBytes(StandardCharsets.ISO_8859_1));
}
}
//*********************************************************************
// Private utilities
/**
* Returns an unqualified version of the given file path.
*/
private static String unqualify(String path) {
path = path.replace('\\', '/');
return path.substring(path.lastIndexOf('/') + 1);
}
//*********************************************************************
// Installation logic (from Robert Field, JSR-045 spec lead)
private static class SDEInstaller {
private final Log log = LogFactory.getLog(SDEInstaller.class); // must not be static
static final String nameSDE = "SourceDebugExtension";
byte[] orig;
byte[] sdeAttr;
byte[] gen;
int origPos = 0;
int genPos = 0;
int sdeIndex;
static void install(File classFile, byte[] smap) throws IOException {
File tmpFile = new File(classFile.getPath() + "tmp");
SDEInstaller installer = new SDEInstaller(classFile, smap);
installer.install(tmpFile);
if (!classFile.delete()) {
throw new IOException("classFile.delete() failed");
}
if (!tmpFile.renameTo(classFile)) {
throw new IOException("tmpFile.renameTo(classFile) failed");
}
}
SDEInstaller(File inClassFile, byte[] sdeAttr)
throws IOException {
if (!inClassFile.exists()) {
throw new FileNotFoundException("no such file: " + inClassFile);
}
this.sdeAttr = sdeAttr;
// get the bytes
orig = readWhole(inClassFile);
gen = new byte[orig.length + sdeAttr.length + 100];
}
void install(File outClassFile) throws IOException {
// do it
addSDE();
// write result
try (FileOutputStream outStream = new FileOutputStream(outClassFile)) {
outStream.write(gen, 0, genPos);
}
}
static byte[] readWhole(File input) throws IOException {
int len = (int)input.length();
byte[] bytes = new byte[len];
try (FileInputStream inStream = new FileInputStream(input)) {
if (inStream.read(bytes, 0, len) != len) {
throw new IOException("expected size: " + len);
}
}
return bytes;
}
void addSDE() throws UnsupportedEncodingException, IOException {
copy(4 + 2 + 2); // magic min/maj version
int constantPoolCountPos = genPos;
int constantPoolCount = readU2();
if (log.isDebugEnabled())
log.debug("constant pool count: " + constantPoolCount);
writeU2(constantPoolCount);
// copy old constant pool return index of SDE symbol, if found
sdeIndex = copyConstantPool(constantPoolCount);
if (sdeIndex < 0) {
// if "SourceDebugExtension" symbol not there add it
writeUtf8ForSDE();
// increment the constantPoolCount
sdeIndex = constantPoolCount;
++constantPoolCount;
randomAccessWriteU2(constantPoolCountPos, constantPoolCount);
if (log.isDebugEnabled())
log.debug("SourceDebugExtension not found, installed at: " + sdeIndex);
} else {
if (log.isDebugEnabled())
log.debug("SourceDebugExtension found at: " + sdeIndex);
}
copy(2 + 2 + 2); // access, this, super
int interfaceCount = readU2();
writeU2(interfaceCount);
if (log.isDebugEnabled())
log.debug("interfaceCount: " + interfaceCount);
copy(interfaceCount * 2);
copyMembers(); // fields
copyMembers(); // methods
int attrCountPos = genPos;
int attrCount = readU2();
writeU2(attrCount);
if (log.isDebugEnabled())
log.debug("class attrCount: " + attrCount);
// copy the class attributes, return true if SDE attr found (not copied)
if (!copyAttrs(attrCount)) {
// we will be adding SDE and it isn't already counted
++attrCount;
randomAccessWriteU2(attrCountPos, attrCount);
if (log.isDebugEnabled())
log.debug("class attrCount incremented");
}
writeAttrForSDE(sdeIndex);
}
void copyMembers() {
int count = readU2();
writeU2(count);
if (log.isDebugEnabled())
log.debug("members count: " + count);
for (int i = 0; i < count; ++i) {
copy(6); // access, name, descriptor
int attrCount = readU2();
writeU2(attrCount);
if (log.isDebugEnabled())
log.debug("member attr count: " + attrCount);
copyAttrs(attrCount);
}
}
boolean copyAttrs(int attrCount) {
boolean sdeFound = false;
for (int i = 0; i < attrCount; ++i) {
int nameIndex = readU2();
// don't write old SDE
if (nameIndex == sdeIndex) {
sdeFound = true;
if (log.isDebugEnabled())
log.debug("SDE attr found");
} else {
writeU2(nameIndex); // name
int len = readU4();
writeU4(len);
copy(len);
if (log.isDebugEnabled())
log.debug("attr len: " + len);
}
}
return sdeFound;
}
void writeAttrForSDE(int index) {
writeU2(index);
writeU4(sdeAttr.length);
for (int i = 0; i < sdeAttr.length; ++i) {
writeU1(sdeAttr[i]);
}
}
void randomAccessWriteU2(int pos, int val) {
int savePos = genPos;
genPos = pos;
writeU2(val);
genPos = savePos;
}
int readU1() {
return orig[origPos++] & 0xFF;
}
int readU2() {
int res = readU1();
return (res << 8) + readU1();
}
int readU4() {
int res = readU2();
return (res << 16) + readU2();
}
void writeU1(int val) {
gen[genPos++] = (byte)val;
}
void writeU2(int val) {
writeU1(val >> 8);
writeU1(val & 0xFF);
}
void writeU4(int val) {
writeU2(val >> 16);
writeU2(val & 0xFFFF);
}
void copy(int count) {
for (int i = 0; i < count; ++i) {
gen[genPos++] = orig[origPos++];
}
}
byte[] readBytes(int count) {
byte[] bytes = new byte[count];
for (int i = 0; i < count; ++i) {
bytes[i] = orig[origPos++];
}
return bytes;
}
void writeBytes(byte[] bytes) {
for (int i = 0; i < bytes.length; ++i) {
gen[genPos++] = bytes[i];
}
}
int copyConstantPool(int constantPoolCount)
throws UnsupportedEncodingException, IOException {
int sdeIndex = -1;
// copy const pool index zero not in class file
for (int i = 1; i < constantPoolCount; ++i) {
int tag = readU1();
writeU1(tag);
switch (tag) {
case 7 : // Class
case 8 : // String
case 16 : // MethodType
if (log.isDebugEnabled())
log.debug(i + " copying 2 bytes");
copy(2);
break;
case 15 : // MethodHandle
if (log.isDebugEnabled())
log.debug(i + " copying 3 bytes");
copy(3);
break;
case 9 : // Field
case 10 : // Method
case 11 : // InterfaceMethod
case 3 : // Integer
case 4 : // Float
case 12 : // NameAndType
case 18 : // InvokeDynamic
if (log.isDebugEnabled())
log.debug(i + " copying 4 bytes");
copy(4);
break;
case 5 : // Long
case 6 : // Double
if (log.isDebugEnabled())
log.debug(i + " copying 8 bytes");
copy(8);
i++;
break;
case 1 : // Utf8
int len = readU2();
writeU2(len);
byte[] utf8 = readBytes(len);
String str = new String(utf8, "UTF-8");
if (log.isDebugEnabled())
log.debug(i + " read class attr -- '" + str + "'");
if (str.equals(nameSDE)) {
sdeIndex = i;
}
writeBytes(utf8);
break;
default :
throw new IOException("unexpected tag: " + tag);
}
}
return sdeIndex;
}
void writeUtf8ForSDE() {
int len = nameSDE.length();
writeU1(1); // Utf8 tag
writeU2(len);
for (int i = 0; i < len; ++i) {
writeU1(nameSDE.charAt(i));
}
}
}
public static void evaluateNodes(
Node.Nodes nodes,
SmapStratum s,
HashMap innerClassMap,
boolean breakAtLF) {
try {
nodes.visit(new SmapGenVisitor(s, breakAtLF, innerClassMap));
} catch (JasperException ex) {
}
}
private static class SmapGenVisitor extends Node.Visitor {
private SmapStratum smap;
private final boolean breakAtLF;
private final HashMap innerClassMap;
SmapGenVisitor(SmapStratum s, boolean breakAtLF, HashMap map) {
this.smap = s;
this.breakAtLF = breakAtLF;
this.innerClassMap = map;
}
@Override
public void visitBody(Node n) throws JasperException {
SmapStratum smapSave = smap;
String innerClass = n.getInnerClassName();
if (innerClass != null) {
this.smap = innerClassMap.get(innerClass);
}
super.visitBody(n);
smap = smapSave;
}
@Override
public void visit(Node.Declaration n) throws JasperException {
doSmapText(n);
}
@Override
public void visit(Node.Expression n) throws JasperException {
doSmapText(n);
}
@Override
public void visit(Node.Scriptlet n) throws JasperException {
doSmapText(n);
}
@Override
public void visit(Node.IncludeAction n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.ForwardAction n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.GetProperty n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.SetProperty n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.UseBean n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.PlugIn n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.CustomTag n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.UninterpretedTag n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.JspElement n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.JspText n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.NamedAttribute n) throws JasperException {
visitBody(n);
}
@Override
public void visit(Node.JspBody n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.InvokeAction n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.DoBodyAction n) throws JasperException {
doSmap(n);
visitBody(n);
}
@Override
public void visit(Node.ELExpression n) throws JasperException {
doSmap(n);
}
@Override
public void visit(Node.TemplateText n) throws JasperException {
Mark mark = n.getStart();
if (mark == null) {
return;
}
//Add the file information
String fileName = mark.getFile();
smap.addFile(unqualify(fileName), fileName);
//Add a LineInfo that corresponds to the beginning of this node
int iInputStartLine = mark.getLineNumber();
int iOutputStartLine = n.getBeginJavaLine();
int iOutputLineIncrement = breakAtLF? 1: 0;
smap.addLineData(iInputStartLine, fileName, 1, iOutputStartLine,
iOutputLineIncrement);
// Output additional mappings in the text
java.util.ArrayList extraSmap = n.getExtraSmap();
if (extraSmap != null) {
for (int i = 0; i < extraSmap.size(); i++) {
iOutputStartLine += iOutputLineIncrement;
smap.addLineData(
iInputStartLine+extraSmap.get(i).intValue(),
fileName,
1,
iOutputStartLine,
iOutputLineIncrement);
}
}
}
private void doSmap(
Node n,
int inLineCount,
int outIncrement,
int skippedLines) {
Mark mark = n.getStart();
if (mark == null) {
return;
}
String unqualifiedName = unqualify(mark.getFile());
smap.addFile(unqualifiedName, mark.getFile());
smap.addLineData(
mark.getLineNumber() + skippedLines,
mark.getFile(),
inLineCount - skippedLines,
n.getBeginJavaLine() + skippedLines,
outIncrement);
}
private void doSmap(Node n) {
doSmap(n, 1, n.getEndJavaLine() - n.getBeginJavaLine(), 0);
}
private void doSmapText(Node n) {
String text = n.getText();
int index = 0;
int next = 0;
int lineCount = 1;
int skippedLines = 0;
boolean slashStarSeen = false;
boolean beginning = true;
// Count lines inside text, but skipping comment lines at the
// beginning of the text.
while ((next = text.indexOf('\n', index)) > -1) {
if (beginning) {
String line = text.substring(index, next).trim();
if (!slashStarSeen && line.startsWith("/*")) {
slashStarSeen = true;
}
if (slashStarSeen) {
skippedLines++;
int endIndex = line.indexOf("*/");
if (endIndex >= 0) {
// End of /* */ comment
slashStarSeen = false;
if (endIndex < line.length() - 2) {
// Some executable code after comment
skippedLines--;
beginning = false;
}
}
} else if (line.length() == 0 || line.startsWith("//")) {
skippedLines++;
} else {
beginning = false;
}
}
lineCount++;
index = next + 1;
}
doSmap(n, lineCount, 1, skippedLines);
}
}
private static class PreScanVisitor extends Node.Visitor {
HashMap map = new HashMap<>();
@Override
public void doVisit(Node n) {
String inner = n.getInnerClassName();
if (inner != null && !map.containsKey(inner)) {
map.put(inner, new SmapStratum());
}
}
HashMap getMap() {
return map;
}
}
public static SmapStratum loadSmap(String className, ClassLoader cl) {
// Extract SMAP from class file. First line "SMAP" is not included
String smap = getSmap(className, cl);
if (smap == null) {
return null;
}
SmapStratum smapStratum = new SmapStratum();
String[] lines = smap.split("\n");
int lineIndex = 0;
// First line is output file name
smapStratum.setOutputFileName(lines[lineIndex]);
// There is only one stratum (JSP) so skip to the start of the file
// section
lineIndex = 4;
while (!lines[lineIndex].equals("*L")) {
int i = lines[lineIndex].lastIndexOf(' ');
String fileName = lines[lineIndex].substring(i + 1);
smapStratum.addFile(fileName, lines[++lineIndex]);
lineIndex++;
}
// Skip *L
lineIndex++;
while (!lines[lineIndex].equals("*E")) {
LineInfo li = new LineInfo();
// Split into in and out
String[] inOut = lines[lineIndex].split(":");
// Split in on comma (might not be one)
String[] in = inOut[0].split(",");
if (in.length == 2) {
// There is a count
li.setInputLineCount(Integer.parseInt(in[1]));
}
// Check for fileID
String[] start = in[0].split("#");
if (start.length == 2) {
// There is a file ID
li.setLineFileID(Integer.parseInt(start[1]));
}
li.setInputStartLine(Integer.parseInt(start[0]));
// Split out
String[] out = inOut[1].split(",");
if (out.length == 2) {
// There is an increment
li.setOutputLineIncrement(Integer.parseInt(out[1]));
}
li.setOutputStartLine(Integer.parseInt(out[0]));
smapStratum.addLineInfo(li);
lineIndex++;
}
return smapStratum;
}
private static String getSmap(String className, ClassLoader cl) {
Charset encoding = StandardCharsets.ISO_8859_1;
boolean found = false;
String smap = null;
InputStream is = null;
try {
is = cl.getResourceAsStream(className.replaceAll("\\.","/") + ".smap");
if (is != null) {
encoding = SMAP_ENCODING;
found = true;
} else {
is = cl.getResourceAsStream(className.replaceAll("\\.","/") + ".class");
// Alternative approach would be to read the class file as per the
// JLS. That would require duplicating a lot of BCEL functionality.
int b = is.read();
while (b != -1) {
if (b == 'S') {
if ((b = is.read()) != 'M') {
continue;
}
if ((b = is.read()) != 'A') {
continue;
}
if ((b = is.read()) != 'P') {
continue;
}
if ((b = is.read()) != '\n') {
continue;
}
found = true;
break;
}
b = is.read();
}
}
if (found) {
ByteArrayOutputStream baos = new ByteArrayOutputStream(1024);
byte[] buf = new byte[1024];
int numRead;
while ( (numRead = is.read(buf) ) >= 0) {
baos.write(buf, 0, numRead);
}
smap = new String(baos.toByteArray(), encoding);
}
} catch (IOException ioe) {
Log log = LogFactory.getLog(SmapUtil.class);
log.warn(Localizer.getMessage("jsp.warning.loadSmap", className), ioe);
} finally {
if (is != null) {
try {
is.close();
} catch (IOException ioe) {
Log log = LogFactory.getLog(SmapUtil.class);
log.warn(Localizer.getMessage("jsp.warning.loadSmap", className), ioe);
}
}
}
return smap;
}
}
