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remove unused/empty modules
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parent
b35430214b
commit
b374af3526
@ -496,6 +496,8 @@ class Module(override val name: String,
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val source: Path) : Node, INameScope {
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override lateinit var parent: Node
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lateinit var program: Program
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val imports = mutableSetOf<Module>()
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val importedBy = mutableSetOf<Module>()
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override fun linkParents(parent: Node) {
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this.parent=parent
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@ -1625,7 +1627,7 @@ class FunctionCallStatement(override var target: IdentifierReference,
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override fun process(processor: IAstProcessor) = processor.process(this)
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override fun toString(): String {
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return "FunctionCall(target=$target, pos=$position)"
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return "FunctionCallStatement(target=$target, pos=$position)"
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}
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}
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@ -1690,6 +1692,9 @@ class Subroutine(override val name: String,
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override var statements: MutableList<IStatement>,
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override val position: Position) : IStatement, INameScope {
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override lateinit var parent: Node
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val calledBy = mutableSetOf<Subroutine>()
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val calls = mutableSetOf<Subroutine>()
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val scopedname: String by lazy { makeScopedName(name) }
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override fun linkParents(parent: Node) {
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90
compiler/src/prog8/optimizing/CallGraphBuilder.kt
Normal file
90
compiler/src/prog8/optimizing/CallGraphBuilder.kt
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@ -0,0 +1,90 @@
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package prog8.optimizing
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import prog8.ast.*
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class CallGraphBuilder(private val program: Program): IAstProcessor {
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private val modulesImporting = mutableMapOf<Module, Set<Module>>().withDefault { mutableSetOf() }
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private val modulesImportedBy = mutableMapOf<Module, Set<Module>>().withDefault { mutableSetOf() }
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private val subroutinesCalling = mutableMapOf<Subroutine, Set<Subroutine>>().withDefault { mutableSetOf() }
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private val subroutinesCalledBy = mutableMapOf<Subroutine, Set<Subroutine>>().withDefault { mutableSetOf() }
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private fun forAllSubroutines(scope: INameScope, sub: (s: Subroutine) -> Unit) {
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fun findSubs(scope: INameScope) {
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scope.statements.forEach {
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if(it is Subroutine)
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sub(it)
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if(it is INameScope)
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findSubs(it)
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}
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}
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findSubs(scope)
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}
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override fun process(program: Program) {
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super.process(program)
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program.modules.forEach {
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it.importedBy.clear()
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it.imports.clear()
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it.importedBy.addAll(modulesImportedBy.getValue(it))
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it.imports.addAll(modulesImporting.getValue(it))
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if(it.isLibraryModule && it.importedBy.isEmpty())
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it.importedBy.add(it) // don't discard auto-imported library module
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forAllSubroutines(it) { sub ->
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sub.calledBy.clear()
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sub.calls.clear()
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sub.calledBy.addAll(subroutinesCalledBy.getValue(sub))
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sub.calls.addAll(subroutinesCalling.getValue(sub))
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}
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}
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val rootmodule = program.modules.first()
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rootmodule.importedBy.add(rootmodule) // don't discard root module
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}
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override fun process(directive: Directive): IStatement {
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if(directive.directive=="%import") {
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val importedModule: Module = program.modules.single { it.name==directive.args[0].name }
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val thisModule = directive.definingModule()
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modulesImporting[thisModule] = modulesImporting.getValue(thisModule).plus(importedModule)
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modulesImportedBy[importedModule] = modulesImportedBy.getValue(importedModule).plus(thisModule)
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}
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return super.process(directive)
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}
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override fun process(functionCall: FunctionCall): IExpression {
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val otherSub = functionCall.target.targetSubroutine(program.namespace)
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if(otherSub!=null) {
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val thisSub = functionCall.definingScope() as Subroutine
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subroutinesCalling[thisSub] = subroutinesCalling.getValue(thisSub).plus(otherSub)
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subroutinesCalledBy[otherSub] = subroutinesCalledBy.getValue(otherSub).plus(thisSub)
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}
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return super.process(functionCall)
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}
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override fun process(functionCallStatement: FunctionCallStatement): IStatement {
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val otherSub = functionCallStatement.target.targetSubroutine(program.namespace)
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if(otherSub!=null) {
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val thisSub = functionCallStatement.definingScope() as Subroutine
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subroutinesCalling[thisSub] = subroutinesCalling.getValue(thisSub).plus(otherSub)
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subroutinesCalledBy[otherSub] = subroutinesCalledBy.getValue(otherSub).plus(thisSub)
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}
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return super.process(functionCallStatement)
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}
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override fun process(jump: Jump): IStatement {
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val otherSub = jump.identifier?.targetSubroutine(program.namespace)
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if(otherSub!=null) {
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val thisSub = jump.definingScope() as Subroutine
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subroutinesCalling[thisSub] = subroutinesCalling.getValue(thisSub).plus(otherSub)
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subroutinesCalledBy[otherSub] = subroutinesCalledBy.getValue(otherSub).plus(thisSub)
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}
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return super.process(jump)
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}
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}
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@ -11,7 +11,7 @@ import kotlin.math.floor
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todo: implement usage counters for blocks, variables, subroutines, heap variables. Then:
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todo remove unused: subroutines, blocks, modules (in this order)
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todo remove unused: subroutines, blocks (in this order)
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todo remove unused: variable declarations
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todo remove unused strings and arrays from the heap
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todo inline subroutines that are called exactly once (regardless of their size)
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@ -28,6 +28,24 @@ class StatementOptimizer(private val program: Program) : IAstProcessor {
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private set
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private val pureBuiltinFunctions = BuiltinFunctions.filter { it.value.pure }
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override fun process(program: Program) {
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val callgraph = CallGraphBuilder(program)
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callgraph.process(program)
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// remove modules that are not imported, or are empty
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val removeModules = mutableSetOf<Module>()
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program.modules.forEach {
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if(it.importedBy.isEmpty() || it.isEmpty()) {
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printWarning("discarding empty or unused module: ${it.name}")
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removeModules.add(it)
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}
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}
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program.modules.removeAll(removeModules)
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super.process(program)
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}
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override fun process(block: Block): IStatement {
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if(block.statements.isEmpty()) {
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// remove empty block
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@ -38,6 +56,7 @@ class StatementOptimizer(private val program: Program) : IAstProcessor {
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}
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override fun process(subroutine: Subroutine): IStatement {
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println("STMT OPTIMIZE $subroutine ${subroutine.calledBy} ${subroutine.calls}")
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super.process(subroutine)
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if(subroutine.asmAddress==null) {
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