groovy

Compilation bug with spread operator

Details

  • Type: Bug Bug
  • Status: Closed Closed
  • Priority: Critical Critical
  • Resolution: Fixed
  • Affects Version/s: 1.8-rc-4
  • Fix Version/s: None
  • Component/s: class generator
  • Labels:
    None
  • Environment:
    Grails 1.4.0.BUILD-SNAPSHOT
  • Number of attachments :
    1

Description

I'm afraid this happened with Grails 1.4.0.BUILD-SNAPSHOT and a Grails application. That means to reproduce, you will have to build Grails 1.4.0 from trunk or pick up a nightly snapshot. I have attached a sample application.

Here's the stacktrace when running grails compile:

Welcome to Grails 1.4.0.BUILD-SNAPSHOT - http://grails.org/
Licensed under Apache Standard License 2.0
Grails home is set to: /Users/pledbrook/dev/tools/git/grails-core

Base Directory: /Users/pledbrook/dev/projects/scratch/test-1.4-snap
Running script Compile.groovy
Environment set to development
    [mkdir] Created dir: /Users/pledbrook/dev/projects/scratch/test-1.4-snap/target/plugin-classes
  [groovyc] Compiling 46 source files to /Users/pledbrook/dev/projects/scratch/test-1.4-snap/target/plugin-classes
Error executing script Compile: : BUG! exception in phase 'class generation' in source unit '/Users/pledbrook/dev/projects/scratch/test-1.4-snap/target/plugins/fixtures-1.0.6/src/groovy/grails/plugin/fixtures/files/FixtureFileLoader.groovy' SpreadExpression should not be visited here
: BUG! exception in phase 'class generation' in source unit '/Users/pledbrook/dev/projects/scratch/test-1.4-snap/target/plugins/fixtures-1.0.6/src/groovy/grails/plugin/fixtures/files/FixtureFileLoader.groovy' SpreadExpression should not be visited here
	at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:391)
	at gant.Gant$_dispatch_closure7.doCall(Gant.groovy:415)
	at gant.Gant$_dispatch_closure7.doCall(Gant.groovy)
	at java_util_concurrent_Callable$call.call(Unknown Source)
	at gant.Gant.withBuildListeners(Gant.groovy:427)
	at gant.Gant.this$2$withBuildListeners(Gant.groovy)
	at gant.Gant$this$2$withBuildListeners.callCurrent(Unknown Source)
	at gant.Gant.dispatch(Gant.groovy:415)
	at gant.Gant.this$2$dispatch(Gant.groovy)
	at gant.Gant.invokeMethod(Gant.groovy)
	at gant.Gant.executeTargets(Gant.groovy:590)
	at gant.Gant.executeTargets(Gant.groovy:589)
Caused by: : BUG! exception in phase 'class generation' in source unit '/Users/pledbrook/dev/projects/scratch/test-1.4-snap/target/plugins/fixtures-1.0.6/src/groovy/grails/plugin/fixtures/files/FixtureFileLoader.groovy' SpreadExpression should not be visited here
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:116)
	at _GrailsCompile_groovy$_run_closure3_closure9.doCall(_GrailsCompile_groovy:119)
	at _GrailsCompile_groovy$_run_closure3_closure9.doCall(_GrailsCompile_groovy)
	at _GrailsCompile_groovy$_run_closure3.doCall(_GrailsCompile_groovy:106)
	at java_util_concurrent_Callable$call.call(Unknown Source)
	at _GrailsCompile_groovy$_run_closure2.doCall(_GrailsCompile_groovy:45)
	at java_util_concurrent_Callable$call.call(Unknown Source)
	at java_util_concurrent_Callable$call.call(Unknown Source)
	at gant.Gant$_dispatch_closure5.doCall(Gant.groovy:381)
	... 11 more
Caused by: BUG! exception in phase 'class generation' in source unit '/Users/pledbrook/dev/projects/scratch/test-1.4-snap/target/plugins/fixtures-1.0.6/src/groovy/grails/plugin/fixtures/files/FixtureFileLoader.groovy' SpreadExpression should not be visited here
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitSpreadExpression(AsmClassGenerator.java:575)
	at org.codehaus.groovy.classgen.asm.InvocationWriter.writeDirectMethodCall(InvocationWriter.java:125)
	at org.codehaus.groovy.classgen.asm.InvocationWriter.makeCall(InvocationWriter.java:166)
	at org.codehaus.groovy.classgen.asm.InvocationWriter.makeCall(InvocationWriter.java:87)
	at org.codehaus.groovy.classgen.asm.InvocationWriter.makeInvokeMethodCall(InvocationWriter.java:71)
	at org.codehaus.groovy.classgen.asm.InvocationWriter.writeInvokeMethod(InvocationWriter.java:287)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitMethodCallExpression(AsmClassGenerator.java:661)
	at org.codehaus.groovy.classgen.asm.StatementWriter.writeExpressionStatement(StatementWriter.java:599)
	at org.codehaus.groovy.classgen.asm.OptimizingStatementWriter.writeExpressionStatement(OptimizingStatementWriter.java:320)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitExpressionStatement(AsmClassGenerator.java:460)
	at org.codehaus.groovy.classgen.asm.StatementWriter.writeBlockStatement(StatementWriter.java:80)
	at org.codehaus.groovy.classgen.asm.OptimizingStatementWriter.writeBlockStatement(OptimizingStatementWriter.java:151)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitBlockStatement(AsmClassGenerator.java:406)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitStdMethod(AsmClassGenerator.java:289)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitConstructorOrMethod(AsmClassGenerator.java:268)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitMethod(AsmClassGenerator.java:366)
	at org.codehaus.groovy.classgen.AsmClassGenerator.visitClass(AsmClassGenerator.java:174)
	at org.codehaus.groovy.control.CompilationUnit$13.call(CompilationUnit.java:763)
	at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:957)
	at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:542)
	at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:520)
	at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:497)
	at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:476)
	at org.codehaus.groovy.tools.FileSystemCompiler.compile(FileSystemCompiler.java:67)
	at org.codehaus.groovy.tools.FileSystemCompiler.doCompilation(FileSystemCompiler.java:180)
	at org.codehaus.groovy.ant.Groovyc.compile(Groovyc.java:903)
	at org.codehaus.groovy.ant.Groovyc.execute(Groovyc.java:606)
	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
	... 19 more
Error executing script Compile: : BUG! exception in phase 'class generation' in source unit '/Users/pledbrook/dev/projects/scratch/test-1.4-snap/target/plugins/fixtures-1.0.6/src/groovy/grails/plugin/fixtures/files/FixtureFileLoader.groovy' SpreadExpression should not be visited here

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Guillaume Laforge added a comment -

Groovy 1.7 was a bit more tolerant to such errors than Groovy 1.8 seems to be, but there is a bad usage of the spread operator in FixtureFileLoader.groovy.

To summarize what this class is doing (by trimming as much as possible):

class FixtureFileLoader {
    def load(String[] patterns) {
        doLoad(*patterns)
    }
    
    protected doLoad(String[] locationPatterns) {}
}

String[] arr = ['a', 'b', 'c']

def ffl = new FixtureFileLoader()
ffl.load(arr)

You are calling the doLoad() method from the load() method, by spreading the patterns array as arguments, but the doLoad() method actually takes the same array as parameters.

This is a bad usage of the spread operator, as the spread operator is not needed at all.
So just remove the 'star', and the code will work the same in 1.7 and 1.8.

Show
Guillaume Laforge added a comment - Groovy 1.7 was a bit more tolerant to such errors than Groovy 1.8 seems to be, but there is a bad usage of the spread operator in FixtureFileLoader.groovy. To summarize what this class is doing (by trimming as much as possible): class FixtureFileLoader { def load( String [] patterns) { doLoad(*patterns) } protected doLoad( String [] locationPatterns) {} } String [] arr = ['a', 'b', 'c'] def ffl = new FixtureFileLoader() ffl.load(arr) You are calling the doLoad() method from the load() method, by spreading the patterns array as arguments, but the doLoad() method actually takes the same array as parameters. This is a bad usage of the spread operator, as the spread operator is not needed at all. So just remove the 'star', and the code will work the same in 1.7 and 1.8.
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Peter Ledbrook added a comment -

That's fair enough, but surely Groovy should not be printing a "BUG! exception in phase..." message for such an error? Now that I see that the String[] array type is important in the doLoad() method (I was trying with Object[]), it's easy to reproduce:

load("hello", "world")

def load(String[] patterns) {
    loading = true
    doLoad(*patterns)
    loading = false
}

def doLoad(String[] items) {
    println ">> args: ${items}"
}
Show
Peter Ledbrook added a comment - That's fair enough, but surely Groovy should not be printing a "BUG! exception in phase..." message for such an error? Now that I see that the String[] array type is important in the doLoad() method (I was trying with Object[]), it's easy to reproduce: load( "hello" , "world" ) def load( String [] patterns) { loading = true doLoad(*patterns) loading = false } def doLoad( String [] items) { println ">> args: ${items}" }
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Paul King added a comment -

I am also wondering whether the current behavior couldn't be improved. Firstly with a better error message, but I guess we currently don't support adding a varargs/Object[] method at runtime using e.g. EMC, and I wonder whether we should.

Show
Paul King added a comment - I am also wondering whether the current behavior couldn't be improved. Firstly with a better error message, but I guess we currently don't support adding a varargs/Object[] method at runtime using e.g. EMC, and I wonder whether we should.
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blackdrag blackdrag added a comment -

A Bug! message should never appear. Either the case should be caught somewhere else or is valid and still failing. The behaviour here is a bug and should work normally

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blackdrag blackdrag added a comment - A Bug! message should never appear. Either the case should be caught somewhere else or is valid and still failing. The behaviour here is a bug and should work normally
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Paul King added a comment -

reopen until we add the better error message as per Jochen's comment

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Paul King added a comment - reopen until we add the better error message as per Jochen's comment
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blackdrag blackdrag added a comment -

this seems to be fixed by now

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blackdrag blackdrag added a comment - this seems to be fixed by now

People

  • Assignee:
    blackdrag blackdrag
    Reporter:
    Peter Ledbrook
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Dates

  • Created:
    Updated:
    Resolved: