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Instrumentor: also skip classes with methods now too large for JVM's 64k limit #18

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Instrumentor: also skip classes with methods now too large for JVM's 64k limit #18

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40 changes: 31 additions & 9 deletions instrumentor/src/main/java/edu/cmu/sv/kelinci/instrumentor/Instrumentor.java
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Original file line number Diff line number Diff line change
Expand Up @@ -42,7 +42,8 @@ public static void main(String[] args) {
// load all classes to instrument (instrument library classes?)
Set<String> inputClasses = Options.v().getInput();

Set<String> skipped = new HashSet<>();
Set<String> skipped_jsr_ret = new HashSet<>();
Set<String> skipped_largemethod = new HashSet<>();

for (String cls : inputClasses) {
System.out.println("Instrumenting class: " + cls);
Expand All @@ -64,21 +65,32 @@ public static void main(String[] args) {
byte[] bytes = cw.toByteArray();
writeClass(cls, bytes);
} catch (RuntimeException rte) {
if (rte.getMessage().contains("JSR/RET")) {
final String msg = rte.getMessage();
if (msg.contains("JSR/RET")) {
/**
* This is an exception related to a particular construct in the bytecode that
* is not supported by ASM. It is deprecated and should not be present in bytecode
* generated by a recent compiler. However, the JDK contains it and it may occur elsewhere.
*
* This catch simply skips the class and warns the user.
*/
System.out.println("\n[WARNING] RuntimeException thrown during instrumentation: " + rte.getMessage());
System.out.println("Skipping instrumentation of class " + cls + "\n");
// include original, uninstrumented class in output
loadAndWriteResource(cls);
skipped.add(cls);
skipped_jsr_ret.add(cls);
} else if (msg.contains("Method code too large")) {
/**
* Adding instrumentation to classes might push some large
* methods' size over the JVM's 64k method limit.
*
* This catch simply skips the class and warns the user.
*/
skipped_largemethod.add(cls);
} else {
throw rte;
}

System.out.println("\n[WARNING] RuntimeException thrown during instrumentation: " + rte.getMessage());
System.out.println("Skipping instrumentation of class " + cls + "\n");
// include original, uninstrumented class in output
loadAndWriteResource(cls);
}

}
Expand All @@ -97,14 +109,24 @@ public static void main(String[] args) {
loadAndWriteResource(resource);
}

if (skipped.size() > 0) {
if (skipped_jsr_ret.size() > 0) {
System.out.println("\nWARNING!!! Instrumentation of some classes has been skipped.");
System.out.println("This is due to the JSR/RET bytecode construct that is not supported by ASM.");
System.out.println("It is deprecated and should not be present in bytecode generated by a recent compiler.");
System.out.println("If this is your code, try using a different compiler.");
System.out.println("If this is a library, there might be not too much harm in skipping instrumentation of these classes.");
System.out.println("Classes that were skipped:");
for (String cls : skipped)
for (String cls : skipped_jsr_ret)
System.out.println(cls);
}

if (skipped_largemethod.size() > 0) {
System.out.println("\nWARNING!!! Instrumentation of some classes has been skipped.");
System.out.println("This is due to the instrumentation pushing the size of a.");
System.out.println("method over the JVM's 64k method limit");
System.out.println("If this is your code, try splitting it into smaller methods.");
System.out.println("Classes that were skipped:");
for (String cls : skipped_largemethod)
System.out.println(cls);
}
}
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