Added inspection for unresolved symbols, macros and labels.

src/main/java/de/platon42/intellij/plugins/m68k/inspections/M68kUnresolvedReferenceInspection.kt

@@ -0,0 +1,48 @@
+package de.platon42.intellij.plugins.m68k.inspections
+
+import com.intellij.codeInspection.LocalInspectionToolSession
+import com.intellij.codeInspection.ProblemHighlightType
+import com.intellij.codeInspection.ProblemsHolder
+import com.intellij.psi.PsiElementVisitor
+import com.intellij.psi.PsiPolyVariantReference
+import de.platon42.intellij.plugins.m68k.psi.M68kMacroCall
+import de.platon42.intellij.plugins.m68k.psi.M68kSymbolReference
+import de.platon42.intellij.plugins.m68k.psi.M68kVisitor
+import de.platon42.intellij.plugins.m68k.refs.M68kGlobalLabelSymbolReference
+
+class M68kUnresolvedReferenceInspection : AbstractBaseM68kLocalInspectionTool() {
+
+    companion object {
+        private const val DISPLAY_NAME = "Unresolved label/symbol/macro reference"
+    }
+
+    override fun getDisplayName() = DISPLAY_NAME
+
+    override fun buildVisitor(holder: ProblemsHolder, isOnTheFly: Boolean, session: LocalInspectionToolSession): PsiElementVisitor {
+        return object : M68kVisitor() {
+            override fun visitMacroCall(macroCall: M68kMacroCall) {
+                val reference = macroCall.reference as? PsiPolyVariantReference ?: return
+                val resolve = reference.multiResolve(false)
+                if (resolve.isEmpty()) {
+                    holder.registerProblem(reference)
+                }
+            }
+
+            override fun visitSymbolReference(symbolReference: M68kSymbolReference) {
+                val references = symbolReference.references ?: return
+                if (references.isEmpty()) return
+                val resolve = references.mapNotNull { it as? PsiPolyVariantReference }
+                    .firstNotNullOfOrNull { it.multiResolve(false).ifEmpty { null } }
+                if (resolve == null) {
+                    // TODO currently, because macro invocations are not evaluated, mark missing symbols only as weak warning
+                    val makeWeak = references.any { it is M68kGlobalLabelSymbolReference }
+                    if (makeWeak) {
+                        holder.registerProblem(references.first(), ProblemHighlightType.WEAK_WARNING)
+                    } else {
+                        holder.registerProblem(references.first())
+                    }
+                }
+            }
+        }
+    }
+}

src/main/java/de/platon42/intellij/plugins/m68k/psi/M68kMacroCallMixin.kt

@@ -7,6 +7,10 @@ import com.intellij.psi.impl.source.resolve.reference.ReferenceProvidersRegistry
 
 abstract class M68kMacroCallMixin(node: ASTNode) : ASTWrapperPsiElement(node), M68kMacroCall {
 
+    override fun getReference(): PsiReference? {
+        return references.firstOrNull()
+    }
+
     override fun getReferences(): Array<PsiReference> {
         return ReferenceProvidersRegistry.getReferencesFromProviders(this)
     }

src/main/java/de/platon42/intellij/plugins/m68k/psi/M68kPreprocessorDirectiveMixin.kt

@@ -7,6 +7,10 @@ import com.intellij.psi.impl.source.resolve.reference.ReferenceProvidersRegistry
 
 abstract class M68kPreprocessorDirectiveMixin(node: ASTNode) : ASTWrapperPsiElement(node), M68kPreprocessorDirective {
 
+    override fun getReference(): PsiReference? {
+        return references.firstOrNull()
+    }
+
     override fun getReferences(): Array<PsiReference> {
         return ReferenceProvidersRegistry.getReferencesFromProviders(this)
     }

src/main/java/de/platon42/intellij/plugins/m68k/psi/M68kSymbolReferenceMixin.kt

@@ -7,6 +7,10 @@ import com.intellij.psi.impl.source.resolve.reference.ReferenceProvidersRegistry
 
 abstract class M68kSymbolReferenceMixin(node: ASTNode) : ASTWrapperPsiElement(node), M68kSymbolReference {
 
+    override fun getReference(): PsiReference? {
+        return references.firstOrNull()
+    }
+
     override fun getReferences(): Array<PsiReference> {
         return ReferenceProvidersRegistry.getReferencesFromProviders(this)
     }

src/main/java/de/platon42/intellij/plugins/m68k/refs/M68kLocalLabelReference.kt

@@ -1,5 +1,6 @@
 package de.platon42.intellij.plugins.m68k.refs
 
+import com.intellij.codeInsight.daemon.EmptyResolveMessageProvider
 import com.intellij.codeInsight.lookup.LookupElementBuilder
 import com.intellij.openapi.util.TextRange
 import com.intellij.psi.PsiElement
@@ -14,11 +15,15 @@ import de.platon42.intellij.plugins.m68k.psi.M68kLocalLabel
 import de.platon42.intellij.plugins.m68k.psi.M68kStatement
 import de.platon42.intellij.plugins.m68k.psi.M68kSymbolReference
 
-class M68kLocalLabelReference(element: M68kSymbolReference) : PsiPolyVariantReferenceBase<M68kSymbolReference>(element, TextRange(0, element.textLength)) {
+class M68kLocalLabelReference(element: M68kSymbolReference) :
+    PsiPolyVariantReferenceBase<M68kSymbolReference>(element, TextRange(0, element.textLength)),
+    EmptyResolveMessageProvider {
 
     companion object {
         val INSTANCE = Resolver()
 
+        private const val UNRESOLVED_MESSAGE_PATTERN = "Cannot resolve local label ''{0}''"
+
         fun findLocalLabels(element: M68kSymbolReference, predicate: (M68kLocalLabel) -> Boolean): List<M68kLocalLabel> {
             val statement = PsiTreeUtil.getStubOrPsiParentOfType(element, M68kStatement::class.java)!!
             val results = SmartList<M68kLocalLabel>()
@@ -42,6 +47,8 @@ class M68kLocalLabelReference(element: M68kSymbolReference) : PsiPolyVariantRefe
         }
     }
 
+    override fun getUnresolvedMessagePattern() = UNRESOLVED_MESSAGE_PATTERN
+
     class Resolver : ResolveCache.PolyVariantResolver<M68kLocalLabelReference> {
         override fun resolve(ref: M68kLocalLabelReference, incompleteCode: Boolean): Array<ResolveResult> {
             val refName = ref.element.symbolName

src/main/java/de/platon42/intellij/plugins/m68k/refs/M68kMacroReference.kt

@@ -1,5 +1,6 @@
 package de.platon42.intellij.plugins.m68k.refs
 
+import com.intellij.codeInsight.daemon.EmptyResolveMessageProvider
 import com.intellij.openapi.util.TextRange
 import com.intellij.psi.PsiElement
 import com.intellij.psi.PsiElementResolveResult
@@ -14,12 +15,16 @@ import de.platon42.intellij.plugins.m68k.psi.M68kMacroDefinition
 import de.platon42.intellij.plugins.m68k.stubs.M68kMacroDefinitionStubIndex
 
 class M68kMacroReference(element: M68kMacroCall) :
-    PsiPolyVariantReferenceBase<M68kMacroCall>(element, TextRange(0, element.macroName.length)) {
+    PsiPolyVariantReferenceBase<M68kMacroCall>(element, TextRange(0, element.macroName.length)), EmptyResolveMessageProvider {
 
     companion object {
         val INSTANCE = Resolver()
+
+        private const val UNRESOLVED_MESSAGE_PATTERN = "Cannot resolve macro ''{0}''"
     }
 
+    override fun getUnresolvedMessagePattern() = UNRESOLVED_MESSAGE_PATTERN
+
     class Resolver : ResolveCache.PolyVariantResolver<M68kMacroReference> {
         override fun resolve(ref: M68kMacroReference, incompleteCode: Boolean): Array<ResolveResult> {
             val macroName = ref.element.macroName

src/main/resources/META-INF/plugin.xml

@@ -61,6 +61,9 @@
         <localInspection implementationClass="de.platon42.intellij.plugins.m68k.inspections.M68kUnexpectedConditionalInstructionInspection"
                          displayName="Unaffected condition codes before conditional instruction" groupName="M68k"
                          enabledByDefault="true" level="WARNING"/>
+        <localInspection implementationClass="de.platon42.intellij.plugins.m68k.inspections.M68kUnresolvedReferenceInspection"
+                         displayName="Unresolved label/symbol/macro reference" groupName="M68k"
+                         enabledByDefault="true" level="WARNING"/>
     </extensions>
 
     <actions>

src/main/resources/inspectionDescriptions/M68kUnresolvedReference.html

@@ -0,0 +1,8 @@
+<html>
+<body>
+Checks if references to symbols, macros, global and local labels are resolvable.
+<!-- tooltip end -->
+<p>Currently, issues a weak warning for global labels or symbols as those
+    can be defined via macros, which are not evaluated right now</p>
+</body>
+</html>