mirror of
https://github.com/irmen/prog8.git
synced 2024-06-28 20:29:36 +00:00
removal of unused nodes
This commit is contained in:
Irmen de Jong
parent
cc73d90d6e
commit
3e11d45883
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@ -11,12 +11,15 @@
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~ extra233 {
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; this is imported
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X = 42
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return 44
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const byte snerp=33
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const byte snerp2 = snerp+22
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sub foo() -> () {
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A=99
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return
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X = 42+snerp
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return 44+snerp
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sub foo234234() -> () {
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A=99+snerp
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return A+snerp2
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}
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}
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@ -14,20 +14,27 @@ fun main(args: Array<String>) {
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println("\nIL65 compiler by Irmen de Jong (irmen@razorvine.net)")
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println("This software is licensed under the GNU GPL 3.0, see https://www.gnu.org/licenses/gpl.html\n")
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// import main module and process additional imports
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val filepath = Paths.get(args[0]).normalize()
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val moduleAst = importModule(filepath)
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moduleAst.linkParents()
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val globalNamespace = moduleAst.namespace()
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//globalNamespace.debugPrint()
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// perform syntax checks and optimizations
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moduleAst.checkIdentifiers(globalNamespace)
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moduleAst.optimizeExpressions(globalNamespace)
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moduleAst.optimizeStatements(globalNamespace)
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val allScopedSymbolDefinitions = moduleAst.checkIdentifiers(globalNamespace)
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moduleAst.optimizeStatements(globalNamespace, allScopedSymbolDefinitions)
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val globalNamespaceAfterOptimize = moduleAst.namespace() // it could have changed in the meantime
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moduleAst.checkValid(globalNamespaceAfterOptimize) // check if final tree is valid
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val allScopedSymbolDefinitions = moduleAst.checkIdentifiers(globalNamespace)
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// determine special compiler options
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val options = moduleAst.statements.filter { it is Directive && it.directive=="%option" }.flatMap { (it as Directive).args }.toSet()
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val outputType = (moduleAst.statements.singleOrNull { it is Directive && it.directive=="%output"}
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as? Directive)?.args?.single()?.name?.toUpperCase()
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@ -42,6 +49,10 @@ fun main(args: Array<String>) {
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if(zpType==null) ZeropageType.COMPATIBLE else ZeropageType.valueOf(zpType),
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options.contains(DirectiveArg(null, "enable_floats", null))
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)
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// compile the syntax tree into intermediate form, and optimize that
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val compiler = Compiler(compilerOptions, globalNamespaceAfterOptimize)
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val intermediate = compiler.compile(moduleAst)
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intermediate.optimize()
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@ -49,8 +60,8 @@ fun main(args: Array<String>) {
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// val assembler = intermediate.compileToAssembly()
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// assembler.assemble(compilerOptions, "input", "output")
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// val monitorfile = assembler.generateBreakpointList()
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// start the vice emulator
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//
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// // start the vice emulator
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// val program = "foo"
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// val cmdline = listOf("x64", "-moncommands", monitorfile,
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// "-autostartprgmode", "1", "-autostart-warp", "-autostart", program)
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@ -61,5 +72,3 @@ fun main(args: Array<String>) {
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exitProcess(1)
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}
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}
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@ -61,50 +61,62 @@ class ExpressionException(message: String, val position: Position?) : AstExcepti
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data class Position(val file: String, val line: Int, val startCol: Int, val endCol: Int) {
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override fun toString(): String = "[$file: line $line col $startCol-$endCol]"
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override fun toString(): String = "[$file: line $line col ${startCol+1}-${endCol+1}]"
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}
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interface IAstProcessor {
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fun process(module: Module) {
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module.statements = module.statements.map { it.process(this) }
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module.statements = module.statements.map { it.process(this) }.toMutableList()
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}
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fun process(expr: PrefixExpression): IExpression {
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expr.expression = expr.expression.process(this)
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return expr
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}
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fun process(expr: BinaryExpression): IExpression {
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expr.left = expr.left.process(this)
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expr.right = expr.right.process(this)
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return expr
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}
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fun process(directive: Directive): IStatement {
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return directive
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}
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fun process(block: Block): IStatement {
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block.statements = block.statements.map { it.process(this) }
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block.statements = block.statements.map { it.process(this) }.toMutableList()
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return block
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}
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fun process(decl: VarDecl): IStatement {
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decl.value = decl.value?.process(this)
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decl.arrayspec?.process(this)
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return decl
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}
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fun process(subroutine: Subroutine): IStatement {
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subroutine.statements = subroutine.statements.map { it.process(this) }
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subroutine.statements = subroutine.statements.map { it.process(this) }.toMutableList()
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return subroutine
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}
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fun process(functionCall: FunctionCall): IExpression {
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functionCall.arglist = functionCall.arglist.map { it.process(this) }
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return functionCall
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}
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fun process(functionCall: FunctionCallStatement): IStatement {
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functionCall.arglist = functionCall.arglist.map { it.process(this) }
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return functionCall
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}
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fun process(identifier: IdentifierReference): IExpression {
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// note: this is an identifier that is used in an expression.
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// other identifiers are simply part of the other statements (such as jumps, subroutine defs etc)
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return identifier
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}
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fun process(jump: Jump): IStatement {
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return jump
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}
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@ -137,7 +149,7 @@ interface Node {
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interface IStatement : Node {
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fun process(processor: IAstProcessor) : IStatement
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fun scopedName(name: String): String {
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fun makeScopedName(name: String): List<String> {
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val scope = mutableListOf<String>()
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var statementScope = this.parent
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while(statementScope!=null && statementScope !is Module) {
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@ -147,7 +159,7 @@ interface IStatement : Node {
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statementScope = statementScope.parent
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}
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scope.add(name)
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return scope.joinToString(".")
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return scope
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}
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}
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@ -160,7 +172,11 @@ interface IFunctionCall {
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interface INameScope {
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val name: String
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val position: Position?
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var statements: List<IStatement>
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var statements: MutableList<IStatement>
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fun usedNames(): Set<String>
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fun registerUsedName(name: String)
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fun subScopes() = statements.filter { it is INameScope } .map { it as INameScope }.associate { it.name to it }
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@ -188,6 +204,9 @@ interface INameScope {
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statementScope = statementScope.parent
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if (statementScope == null)
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return null
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if(statementScope.parent==null && statementScope !is Module)
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throw AstException("non-Module node has no parent! node: $statementScope at ${statementScope.position}")
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val localScope = statementScope as INameScope
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val result = localScope.definedNames()[scopedName[0]]
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if (result != null)
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@ -213,6 +232,12 @@ interface INameScope {
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}
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printNames(0, this)
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}
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fun removeStatement(statement: IStatement) {
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// remove a statement (most likely because it is never referenced such as a subroutine)
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val removed = statements.remove(statement)
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if(!removed) throw AstException("node to remove wasn't found")
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}
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}
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@ -236,13 +261,14 @@ data class AnonymousStatementList(override var parent: Node?, var statements: Li
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data class Module(override val name: String,
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override var statements: List<IStatement>) : Node, INameScope {
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override var statements: MutableList<IStatement>) : Node, INameScope {
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override var position: Position? = null
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override var parent: Node? = null
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override fun linkParents(parent: Node) {
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this.parent=parent
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}
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fun linkParents() {
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parent = null
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statements.forEach {it.linkParents(this)}
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@ -254,17 +280,44 @@ data class Module(override val name: String,
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fun namespace(): INameScope {
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class GlobalNamespace(override val name: String,
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override var statements: List<IStatement>,
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override val position: Position?) : INameScope
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override var statements: MutableList<IStatement>,
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override val position: Position?) : INameScope {
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private val scopedNamesUsed: MutableSet<String> = mutableSetOf("main") // main is always used
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override fun usedNames(): Set<String> = scopedNamesUsed
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override fun lookup(scopedName: List<String>, statement: Node): IStatement? {
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val stmt = super.lookup(scopedName, statement)
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if(stmt!=null) {
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val targetScopedName = when(stmt) {
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is Label -> stmt.makeScopedName(stmt.name)
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is VarDecl -> stmt.makeScopedName(stmt.name)
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is Block -> stmt.makeScopedName(stmt.name)
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is Subroutine -> stmt.makeScopedName(stmt.name)
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else -> throw NameError("wrong identifier target: $stmt", stmt.position)
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}
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registerUsedName(targetScopedName.joinToString("."))
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}
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return stmt
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}
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override fun registerUsedName(name: String) {
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scopedNamesUsed.add(name)
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}
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}
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return GlobalNamespace("<<<global>>>", statements, position)
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}
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override fun usedNames(): Set<String> = throw NotImplementedError("not implemented on sub-scopes")
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override fun registerUsedName(name: String) = throw NotImplementedError("not implemented on sub-scopes")
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}
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data class Block(override val name: String,
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val address: Int?,
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override var statements: List<IStatement>) : IStatement, INameScope {
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override var statements: MutableList<IStatement>) : IStatement, INameScope {
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override var position: Position? = null
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override var parent: Node? = null
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@ -278,6 +331,9 @@ data class Block(override val name: String,
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override fun toString(): String {
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return "Block(name=$name, address=$address, ${statements.size} statements)"
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}
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override fun usedNames(): Set<String> = throw NotImplementedError("not implemented on sub-scopes")
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override fun registerUsedName(name: String) = throw NotImplementedError("not implemented on sub-scopes")
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}
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@ -533,7 +589,7 @@ data class RegisterExpr(val register: Register) : IExpression {
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}
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data class IdentifierReference(val scopedName: List<String>) : IExpression {
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data class IdentifierReference(val nameInSource: List<String>) : IExpression {
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override var position: Position? = null
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override var parent: Node? = null
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@ -542,9 +598,9 @@ data class IdentifierReference(val scopedName: List<String>) : IExpression {
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}
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override fun constValue(namespace: INameScope): LiteralValue? {
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val node = namespace.lookup(scopedName, this)
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val node = namespace.lookup(nameInSource, this)
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?:
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throw ExpressionException("undefined symbol: ${scopedName.joinToString(".")}", position)
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throw ExpressionException("undefined symbol: ${nameInSource.joinToString(".")}", position)
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val vardecl = node as? VarDecl
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if(vardecl==null) {
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throw ExpressionException("name should be a constant, instead of: ${node::class.simpleName}", position)
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@ -555,7 +611,7 @@ data class IdentifierReference(val scopedName: List<String>) : IExpression {
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}
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override fun process(processor: IAstProcessor) = processor.process(this)
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override fun referencesIdentifier(name: String): Boolean = scopedName.last() == name // @todo is this correct all the time?
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override fun referencesIdentifier(name: String): Boolean = nameInSource.last() == name // @todo is this correct all the time?
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}
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@ -600,8 +656,8 @@ data class FunctionCall(override var target: IdentifierReference, override var a
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override fun constValue(namespace: INameScope): LiteralValue? {
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// if the function is a built-in function and the args are consts, should evaluate!
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if(target.scopedName.size>1) return null
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return when(target.scopedName[0]){
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if(target.nameInSource.size>1) return null
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return when(target.nameInSource[0]){
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"sin" -> builtin_sin(arglist, position, namespace)
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"cos" -> builtin_cos(arglist, position, namespace)
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"abs" -> builtin_abs(arglist, position, namespace)
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@ -656,15 +712,15 @@ data class Subroutine(override val name: String,
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val parameters: List<SubroutineParameter>,
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val returnvalues: List<SubroutineReturnvalue>,
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val address: Int?,
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override var statements: List<IStatement>) : IStatement, INameScope {
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override var statements: MutableList<IStatement>) : IStatement, INameScope {
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override var position: Position? = null
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override var parent: Node? = null
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override fun linkParents(parent: Node) {
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this.parent = parent
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parameters.forEach { it.parent=this }
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returnvalues.forEach { it.parent=this }
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statements.forEach { it.parent=this }
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parameters.forEach { it.linkParents(this) }
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returnvalues.forEach { it.linkParents(this) }
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statements.forEach { it.linkParents(this) }
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}
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override fun process(processor: IAstProcessor) = processor.process(this)
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@ -672,6 +728,9 @@ data class Subroutine(override val name: String,
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override fun toString(): String {
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return "Subroutine(name=$name, address=$address, parameters=$parameters, returnvalues=$returnvalues, ${statements.size} statements)"
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}
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override fun usedNames(): Set<String> = throw NotImplementedError("not implemented on sub-scopes")
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override fun registerUsedName(name: String) = throw NotImplementedError("not implemented on sub-scopes")
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}
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@ -715,7 +774,7 @@ data class IfStatement(var condition: IExpression,
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/***************** Antlr Extension methods to create AST ****************/
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fun il65Parser.ModuleContext.toAst(name: String, withPosition: Boolean) : Module {
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val module = Module(name, modulestatement().map { it.toAst(withPosition) })
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val module = Module(name, modulestatement().map { it.toAst(withPosition) }.toMutableList())
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module.position = toPosition(withPosition)
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return module
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}
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@ -753,8 +812,8 @@ private fun il65Parser.BlockContext.toAst(withPosition: Boolean) : IStatement {
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}
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private fun il65Parser.Statement_blockContext.toAst(withPosition: Boolean): List<IStatement>
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= statement().map { it.toAst(withPosition) }
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private fun il65Parser.Statement_blockContext.toAst(withPosition: Boolean): MutableList<IStatement>
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= statement().map { it.toAst(withPosition) }.toMutableList()
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private fun il65Parser.StatementContext.toAst(withPosition: Boolean) : IStatement {
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@ -918,7 +977,7 @@ private fun il65Parser.SubroutineContext.toAst(withPosition: Boolean) : Subrouti
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if(sub_params()==null) emptyList() else sub_params().toAst(),
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if(sub_returns()==null) emptyList() else sub_returns().toAst(),
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sub_address()?.integerliteral()?.toAst(),
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if(statement_block()==null) emptyList() else statement_block().toAst(withPosition))
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if(statement_block()==null) mutableListOf() else statement_block().toAst(withPosition))
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sub.position = toPosition(withPosition)
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return sub
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}
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|
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@ -309,8 +309,8 @@ class AstChecker(private val globalNamespace: INameScope) : IAstProcessor {
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}
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private fun checkFunctionExists(target: IdentifierReference, statement: IStatement) {
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if(globalNamespace.lookup(target.scopedName, statement)==null)
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checkResult.add(SyntaxError("undefined function or subroutine: ${target.scopedName.joinToString(".")}", statement.position))
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if(globalNamespace.lookup(target.nameInSource, statement)==null)
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checkResult.add(SyntaxError("undefined function or subroutine: ${target.nameInSource.joinToString(".")}", statement.position))
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}
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private fun checkValueRange(datatype: DataType, value: LiteralValue, position: Position?) : Boolean {
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|
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@ -35,50 +35,46 @@ class AstIdentifiersChecker(private val globalNamespace: INameScope) : IAstProce
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}
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override fun process(block: Block): IStatement {
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val scopedName = block.scopedName(block.name)
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val scopedName = block.makeScopedName(block.name).joinToString(".")
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val existing = symbols[scopedName]
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if(existing!=null) {
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nameError(block.name, block.position, existing)
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} else {
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symbols[scopedName] = block
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}
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super.process(block)
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return block
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return super.process(block)
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}
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override fun process(decl: VarDecl): IStatement {
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val scopedName = decl.scopedName(decl.name)
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val scopedName = decl.makeScopedName(decl.name).joinToString(".")
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val existing = symbols[scopedName]
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if(existing!=null) {
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nameError(decl.name, decl.position, existing)
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} else {
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symbols[scopedName] = decl
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}
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super.process(decl)
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return decl
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return super.process(decl)
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}
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override fun process(subroutine: Subroutine): IStatement {
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val scopedName = subroutine.scopedName(subroutine.name)
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val scopedName = subroutine.makeScopedName(subroutine.name).joinToString(".")
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val existing = symbols[scopedName]
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if(existing!=null) {
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nameError(subroutine.name, subroutine.position, existing)
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} else {
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symbols[scopedName] = subroutine
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}
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super.process(subroutine)
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return subroutine
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return super.process(subroutine)
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}
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override fun process(label: Label): IStatement {
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val scopedName = label.scopedName(label.name)
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val scopedName = label.makeScopedName(label.name).joinToString(".")
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val existing = symbols[scopedName]
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if(existing!=null) {
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nameError(label.name, label.position, existing)
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} else {
|
||||
symbols[scopedName] = label
|
||||
}
|
||||
super.process(label)
|
||||
return label
|
||||
return super.process(label)
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -161,7 +161,8 @@ class AssemblyResult(val name: String) {
|
|||
}
|
||||
}
|
||||
|
||||
fun genereateBreakpointList(): String {
|
||||
fun generateBreakpointList(): String {
|
||||
// todo build breakpoint list!
|
||||
/*
|
||||
def generate_breakpoint_list(self, program_filename: str) -> str:
|
||||
breakpoints = []
|
||||
|
|
|
|||
|
|
@ -3,9 +3,10 @@ package il65.optimizing
|
|||
import il65.ast.*
|
||||
|
||||
|
||||
fun Module.optimizeStatements(globalNamespace: INameScope) {
|
||||
fun Module.optimizeStatements(globalNamespace: INameScope, allScopedSymbolDefinitions: MutableMap<String, IStatement>) {
|
||||
val optimizer = StatementOptimizer(globalNamespace)
|
||||
this.process(optimizer)
|
||||
optimizer.removeUnusedNodes(globalNamespace.usedNames(), allScopedSymbolDefinitions)
|
||||
if(optimizer.optimizationsDone==0)
|
||||
println("[${this.name}] 0 optimizations performed")
|
||||
|
||||
|
|
@ -18,7 +19,6 @@ fun Module.optimizeStatements(globalNamespace: INameScope) {
|
|||
}
|
||||
|
||||
/*
|
||||
todo remove unused blocks, subroutines and variable decls (replace with empty AnonymousStatementList)
|
||||
todo statement optimization: create augmented assignment from assignment that only refers to its lvalue (A=A+10, A=4*A, ...)
|
||||
todo statement optimization: X+=1, X-=1 --> X++/X-- ,
|
||||
todo remove statements that have no effect X=X , X+=0, X-=0, X*=1, X/=1, X//=1, A |= 0, A ^= 0, A<<=0, etc etc
|
||||
|
|
@ -37,6 +37,32 @@ class StatementOptimizer(private val globalNamespace: INameScope) : IAstProcesso
|
|||
optimizationsDone = 0
|
||||
}
|
||||
|
||||
override fun process(functionCall: FunctionCall): IExpression {
|
||||
val function = globalNamespace.lookup(functionCall.target.nameInSource, functionCall)
|
||||
if(function!=null) {
|
||||
val scopedName = when(function) {
|
||||
is Label -> function.makeScopedName(function.name)
|
||||
is Subroutine -> function.makeScopedName(function.name)
|
||||
else -> throw AstException("invalid function call target node type")
|
||||
}
|
||||
globalNamespace.registerUsedName(scopedName.joinToString("."))
|
||||
}
|
||||
return super.process(functionCall)
|
||||
}
|
||||
|
||||
override fun process(functionCall: FunctionCallStatement): IStatement {
|
||||
val function = globalNamespace.lookup(functionCall.target.nameInSource, functionCall)
|
||||
if(function!=null) {
|
||||
val scopedName = when(function) {
|
||||
is Label -> function.makeScopedName(function.name)
|
||||
is Subroutine -> function.makeScopedName(function.name)
|
||||
else -> throw AstException("invalid function call target node type")
|
||||
}
|
||||
globalNamespace.registerUsedName(scopedName.joinToString("."))
|
||||
}
|
||||
return super.process(functionCall)
|
||||
}
|
||||
|
||||
override fun process(ifStatement: IfStatement): IStatement {
|
||||
super.process(ifStatement)
|
||||
val constvalue = ifStatement.condition.constValue(globalNamespace)
|
||||
|
|
@ -53,4 +79,16 @@ class StatementOptimizer(private val globalNamespace: INameScope) : IAstProcesso
|
|||
}
|
||||
return ifStatement
|
||||
}
|
||||
|
||||
fun removeUnusedNodes(usedNames: Set<String>, allScopedSymbolDefinitions: MutableMap<String, IStatement>) {
|
||||
for ((name, value) in allScopedSymbolDefinitions) {
|
||||
if(!usedNames.contains(name)) {
|
||||
val parentScope = value.parent as INameScope
|
||||
val localname = name.substringAfterLast(".")
|
||||
println("${value.position} Warning: ${value::class.simpleName} '$localname' is never used")
|
||||
parentScope.removeStatement(value)
|
||||
optimizationsDone++
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user