Bugfixes in handling of target properties across imports

[byeonggiljun]

This PR fixes bugs in the handling of target properties across imports. It addresses #2083; fixes #2149; fixes #2286.

• Timeout should not be inherited #2149
• Fix for handling of target properties in imported files accessed through reactor class inheritance #2340
• Improved handling of files target property #2333

Summary by CodeRabbit

• New Features

  • Introduced methods to handle loading behavior for properties from imported files, federates, and federations.
  • Added capability to copy user files in code generation.

• Refactor

  • Transitioned resource collections from List to Set for improved handling.
  • Restructured logic for merging and updating configurations based on target properties.

• Bug Fixes

  • Improved handling of conflicting connections in modal reactors.

• Documentation

  • Updated internal documentation to reflect new methods and parameter changes.

• Tests

  • Added new test cases for imported CMake includes and federated property loading behavior.

[byeonggiljun]

@lhstrh I also tried to fix #2083 in this PR. I made TargetProperty specify the behavior of being imported. Now, it contains an enum of OVERRIDE, APPEND, and IGNORE. Currently, only FileListProperty has APPEND strategy. However, I'm not sure if this is what you wanted and we can use this to address the below fixme.

lingua-franca/core/src/main/java/org/lflang/generator/c/CGenerator.java

Lines 725 to 734 in 5997ca5

	// FIXME: we're doing ad-hoc merging, and no validation. This is **not** the way to do it.
	if (lfResource != null) {
	// Copy the user files and cmake-includes to the src-gen path of the main .lf file
	copyUserFiles(lfResource.getTargetConfig(), lfResource.getFileConfig());
	// Merge the CMake includes from the imported file into the target config
	if (lfResource.getTargetConfig().isSet(CmakeIncludeProperty.INSTANCE)) {
	CmakeIncludeProperty.INSTANCE.update(
	this.targetConfig, lfResource.getTargetConfig().get(CmakeIncludeProperty.INSTANCE));
	}

I'd appreciate it if you give me a more detailed direction. What validation should be done?

[lhstrh]

Thanks for taking a look at this, @byeong-gil. The issue is a bit tricky.
We essentially have several different ways of setting a target config, each of which might have a different expected outcome:

1. initialize a configuration (i.e., override the defaults)
2. update an already initialized configuration based on a config from an imported file (i.e., main inherits from import)
3. initialize the configuration of a federate on the basis of a configuration of the federation (i.e., federate inherits from federation)
4. update federate's config on the basis of an imported file that it was defined in (i.e., federate inherits from import)

In a way, each target property already specifies what its update behavior is, through its implementation of update. So it seems that what we need is just a way to specify whether a particular property should be regarded at all in scenarios 2, 3, and 4. If it is to be considered, we just use update. Do you agree? Or did I miss something?

[lhstrh]

I had a look, but it doesn't seem we're actually dealing with target properties from imported files in unfederated programs (it's only addressed in FederateTargetConfig). That doesn't seem right to me...

[lhstrh]

Oh, I see. The reason why "it works" is because of the stuff mentioned in #2083. A better way to do this would be to create general a mechanism for getting updates from imported files.

The way I would probably go about doing this would be to create some functions in TargetConfig that have a default implementation that works for most target properties. Stuff like:

• loadFromImport
• loadFromFederation
• loadFromFederate

I would guess that loadFromImport by default returns false, loadFromFederation and loadFromFederate should probably return true. For those properties that have a different behavior, just override those functions.

[lhstrh]

In order to honor loadFromImport, we'd have some extra work to do, but it shouldn't be hard, and it would fix #2083.

[byeonggiljun]

I had a look, but it doesn't seem we're actually dealing with target properties from imported files in unfederated programs (it's only addressed in FederateTargetConfig). That doesn't seem right to me...

You're right. I didn't deal with unfederated programs because I wasn't sure whether I was in the right way.

Now I understand what you want to do. Thanks, @lhstrh! To clarify, I wanna ask one more question.

For what situation loadFromFederate being used? loadFromImport is used when a reactor is imported from another lf file (scenarios 2 and 4) and loadFromFederation is used when each federate file is generated by FedGenerator (scenario 3) I guess.

[lhstrh]

For what situation loadFromFederate being used?

My understanding it should be used to determine which properties to load from the federate itself (as opposed to the federation). Specifically, in the constructor of FederateTargetconfig, the following should be filtered by loadFromFederation:

    // Load properties from the main file
    load(federationResource, reporter);

while the following should be filtered by loadFromFederate:

    // Load properties from the federate file
    mergeImportedConfig(federateResource, federationResource, reporter);

Does this make sense?

[byeonggiljun]

Oh, so it's the federate version of loadFromImport, right?

[lhstrh]

I think that a federate itself can also have imports, which would also need to be handled...

[byeonggiljun]

Hmm... Then I don't understand yet. Actually, the below code handles imported federate.

// Load properties from the federate file
mergeImportedConfig(federateResource, federationResource, reporter);

private void mergeImportedConfig(
      Resource federateResource, Resource mainResource, MessageReporter messageReporter) {
    // If the federate is imported, then update the configuration based on target properties
    // in the imported file.

Regarding the below file, the timeout property from the federation is 5 sec. And the timeout from the imported file is 10 sec. I can't imagine how a federate itself can have a different property from the federation.

In DistributedCount.lf

target C {
  timeout: 5 sec
}

import Count from "../lib/Count.lf"

reactor Print {
  input in: int
  state c: int = 1

  reaction(in) {=
    //
  =}
}

federated reactor DistributedCount(offset: time = 200 msec) {
  c = new Count()
  p = new Print()
  c.out -> p.in after offset
}

In Count.lf

target C {
  timeout: 10 sec
}
...

[lhstrh]

Regarding the below file, the timeout property from the federation is 5 sec. And the timeout from the imported file is 10 sec. I can't imagine how a federate itself can have a different property from the federation.

Right, so that suggests that the loadFromFederate function in TimeOutProperty should return false.

[lhstrh]

By the way, I would look in the fed-gen folder to inspect the code generated for each federate. That will be the code that is worked on, not the original LF source.

[byeonggiljun]

Ok, I'll analyze the code more and fix it. Thanks for your help!

[byeonggiljun]

@lhstrh I attempted to fix this issue again. Now, TargetProperty classes have methods named loadFromImport, loadFromFederation, and loadFromFederate. And in CGenerator, the generator walks through every property from the imported file and decides the behavior based on loadFromImport.

I have two questions.

1. I think we don't need the loadFromFederation method as a federate always inherits the properties from its federation. What do you think?
2. For now, the default value of loadFromImport' and loadFromFederate is false except for CmakeIncludeProperty. Because general properties should not be inherited from the imported file. Are there any other properties that should return true instead? I'm not familiar with every property being used... In my opinion, FileListProperty (superclass of CmakeIncludeProperty, ProtobufsProperty, and FilesProperty), CompilerProperty, and CompilerFlagsProperty, are possible candidates to be expanded from an imported file.

[lhstrh]

@lhstrh I attempted to fix this issue again. Now, TargetProperty classes have methods named loadFromImport, loadFromFederation, and loadFromFederate. And in CGenerator, the generator walks through every property from the imported file and decides the behavior based on loadFromImport.

I have two questions.

This looks great, @byeong-gil. Let me make a pass over this and push changes that will help me answer your question. I believe you got us 90% there already.

[lhstrh]

This is taking a little longer than expected. One problem I see is that some things are handled in CGenerator that should be dealt with in GeneratorBase. Ideally, we'd gather all the target properties and then do things like copy files, but the problem is that the paths are stored as strings, not as fully resolved paths, and resolving files has to be done relative to the file in which the target property is found.

[coderabbitai]

Walkthrough

The changes primarily enhance configuration merging, resource handling, and property loading mechanisms across the federated, generator, and target properties components. Key improvements include using lambdas for configurable property loading, refining resource collection and inheritance handling, and adding new methods to streamline importing and extending target properties.

Changes

File/Path	Change Summary
core/.../FederateTargetConfig.java	Updated mergeImportedConfig to include a lambda parameter for configuration loading behavior.
core/.../GeneratorBase.java	Removed public and protected fields, introduced private methods for property loading and resource transformation, and adjusted transformations for modal reactors.
core/.../GeneratorUtils.java	Shifted from List to Set for resource collections, added methods for handling inherited resources, and updated reactor resource retrieval logic.
core/.../CGenerator.java	Introduced copyUserFiles method, refined code generation logic for reactors, and removed inspectReactorEResource method.
core/.../TargetConfig.java	Added imports and methods for merging and updating configurations, and refactored load method to use lambdas for property processing.
core/.../CmakeIncludeProperty.java	Added loadFromFederate() method to handle property loading from federated configurations.
core/.../FileListProperty.java	Added loadFromImport() method to return true for property loading from imports.
core/.../TargetProperty.java	Added methods loadFromImport(), loadFromFederation(), and loadFromFederate() for property loading decisions.
core/.../FileUtil.java	Added getRelativePath method for computing relative paths between resources.
test/C/.../ImportedCMakeInclude.lf	Added a new test file to verify the handling of imported CMake includes and reactor extensions.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant FederateTargetConfig
    participant GeneratorBase
    participant TargetConfig
    participant CGenerator
    participant GeneratorUtils

    User->>FederateTargetConfig: Call mergeImportedConfig with lambda
    FederateTargetConfig->>TargetConfig: merge and update configurations
    User->>GeneratorBase: generate code
    GeneratorBase->>TargetConfig: load and process properties
    User->>CGenerator: generate C code
    CGenerator->>GeneratorUtils: load and collect resources

Loading

Assessment against linked issues

Objective	Addressed	Explanation
Timeout should not be inherited (#2149)	✅
Target property imported correctly when reactor is extended (#2286)	✅

---

Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between ff7c984 and adfb734.

Files selected for processing (10)

• core/src/main/java/org/lflang/federated/generator/FederateTargetConfig.java (3 hunks)
• core/src/main/java/org/lflang/generator/GeneratorBase.java (7 hunks)
• core/src/main/java/org/lflang/generator/GeneratorUtils.java (3 hunks)
• core/src/main/java/org/lflang/generator/c/CGenerator.java (6 hunks)
• core/src/main/java/org/lflang/target/TargetConfig.java (7 hunks)
• core/src/main/java/org/lflang/target/property/CmakeIncludeProperty.java (1 hunks)
• core/src/main/java/org/lflang/target/property/FileListProperty.java (1 hunks)
• core/src/main/java/org/lflang/target/property/TargetProperty.java (1 hunks)
• core/src/main/java/org/lflang/util/FileUtil.java (1 hunks)
• test/C/src/target/ImportedCMakeInclude.lf (1 hunks)

Files skipped from review due to trivial changes (1)

• core/src/main/java/org/lflang/target/property/FileListProperty.java

Additional comments not posted (18)

test/C/src/target/ImportedCMakeInclude.lf (3)

7-8: Verify extended reactor behavior.

Ensure that the extended reactor does not inherit the timeout property, as per the PR objectives.

Verification successful

---

Verification successful.

The Bar reactor does not inherit the timeout property from Foo. The timeout property is defined in the target section, which is separate from the reactor definitions.

• test/C/src/target/ImportedCMakeInclude.lf: The timeout property is defined in the target section, not within the Bar reactor definition.

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1-3: Verify timeout property handling.

Ensure that the timeout property is not inherited when importing reactors from other files, as per the PR objectives.

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10-12: Verify instantiated reactor behavior.

Ensure that the instantiated reactor handles target properties correctly, as per the PR objectives.

core/src/main/java/org/lflang/target/property/CmakeIncludeProperty.java (1)

43-46: LGTM!

The loadFromFederate method correctly specifies that the property should be loaded from the federate.

core/src/main/java/org/lflang/federated/generator/FederateTargetConfig.java (1)

36-36: LGTM!

The constructor correctly includes the call to mergeImportedConfig with the lambda parameter p -> p.loadFromFederate(), aligning with the PR objectives.

core/src/main/java/org/lflang/generator/GeneratorUtils.java (2)

87-94: LGTM!

The change to return a Set instead of a List in the getResources method improves the uniqueness of resources.

---

98-106: LGTM!

The addInheritedResources method correctly handles inherited resources, aligning with the PR objectives.

core/src/main/java/org/lflang/target/property/TargetProperty.java (3)

107-113: LGTM!

The loadFromImport method correctly returns false by default, ensuring properties are not loaded from imports unless explicitly overridden.

---

115-121: LGTM!

The loadFromFederation method correctly returns true by default, allowing properties to be loaded by federates at the federation level.

---

123-129: LGTM!

The loadFromFederate method correctly returns false by default, ensuring properties are not loaded from imported federates unless explicitly overridden.

core/src/main/java/org/lflang/target/TargetConfig.java (2)

176-205: Ensure correct merging of imported properties.

The mergeImportedConfig method includes logic to merge properties from imported files. Verify that the logic correctly handles properties that should not be loaded from imports.

Verification successful

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Verified: Correct merging of imported properties.

The mergeImportedConfig method includes logic to merge properties from imported files. The predicates loadFromImport and loadFromFederate correctly handle the logic for filtering properties, ensuring that properties not meant to be loaded from imports or federates are appropriately excluded.

• TargetProperty.java:
  • loadFromImport() returns false.
  • loadFromFederate() returns false.

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207-239: Ensure correct updating of properties.

The update method includes logic to handle properties. Verify that the logic correctly handles properties that should not be loaded from imports.

core/src/main/java/org/lflang/generator/GeneratorBase.java (3)

Line range hint 417-447: Ensure correct transformation of conflicting connections.

The transformConflictingConnectionsInModalReactors method includes logic to transform conflicting connections in modal reactors. Verify that the logic correctly handles all necessary transformations.

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Line range hint 417-447: Verified correct transformation of conflicting connections.

The transformConflictingConnectionsInModalReactors method correctly handles the transformation of conflicting connections in modal reactors by checking for unsupported features and transforming eligible connections into reactions. The method is invoked at an appropriate stage in the processing pipeline.

• GeneratorBase.java:
  • Verified the method's logic and its invocation context.

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160-179: Ensure correct loading of target properties.

The loadTargetProperties method includes logic to process target properties from imported files. Verify that the logic correctly handles properties that should not be loaded from imports.

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Ensure correct loading of target properties.

The loadTargetProperties method includes logic to process target properties from imported files. The mergeImportedConfig method, which is called within loadTargetProperties, uses a predicate to ensure that only the appropriate properties are loaded from imports. This implementation appears to handle properties correctly.

• GeneratorBase.java:240
• TargetConfig.java: mergeImportedConfig method

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231-248: Ensure correct handling of target properties during code generation.

The doGenerate method includes logic for loading target properties. Verify that the logic correctly handles properties that should not be loaded from imports.

core/src/main/java/org/lflang/generator/c/CGenerator.java (3)

583-583: Ensure copyUserFiles method is correctly handling target-specific files.

The method copyUserFiles(targetConfig, fileConfig) is added here. Ensure that this method correctly handles copying target-specific files and directories.

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The copyUserFiles method correctly handles target-specific files.

Both GeneratorBase.java and CGenerator.java implementations ensure that target-specific files and directories are copied appropriately. The CGenerator extends the base functionality to include additional properties specific to the C target.

• GeneratorBase.java handles copying files specified in FilesProperty.
• CGenerator.java additionally handles copying files specified in CmakeIncludeProperty.

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797-798: Ensure generateReactorChildren method is correctly generating code for reactor children.

The method generateReactorChildren is added. Ensure that this method correctly generates code for the children of the given reactor and collects preambles and relevant target properties associated with imported reactors.

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728-729: Ensure generateReactorDefinitions method is correctly defining all instantiated reactors.

The method generateReactorDefinitions is added. Ensure that this method correctly defines all instantiated reactors and collects preambles and relevant target properties associated with imported reactors.

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Ensure generateReactorDefinitions method is correctly defining all instantiated reactors.

The generateReactorDefinitions method, along with its helper methods generateReactorChildren and generateReactorClass, correctly defines all instantiated reactors and collects preambles and relevant target properties associated with imported reactors.

• generateReactorDefinitions calls generateReactorChildren to recursively process reactor instances.
• generateReactorChildren ensures all child reactors are included and calls generateReactorClass for each unique reactor.
• generateReactorClass handles the generation of reactor class code, including preambles and properties.

No issues found with the implementation.

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[coderabbitai]

Actionable comments posted: 1

[cmnrd]

This looks like a considerable improvement! I left a few small comments.

[coderabbitai]

Actionable comments posted: 3