Untested for loop generation

generator/expression-multiplex.go

@@ -97,6 +97,8 @@ func (this *generator) generateExpressionAny (expression entity.Expression) (reg
 		return this.generateMatch(expression, resultModeAny)
 	case *entity.Loop:
 		return this.generateLoop(expression, resultModeAny)
+	case *entity.For:
+		return this.generateFor(expression, resultModeAny)
 	
 	// we get nothing from these
 	case *entity.Assignment:
@@ -236,6 +238,9 @@ func (this *generator) generateExpressionLoc (expression entity.Expression) (llv
 	case *entity.Loop:
 		loc, _, err := this.generateLoop(expression, resultModeLoc)
 		return loc, err
+	case *entity.For:
+		loc, _, err := this.generateFor(expression, resultModeLoc)
+		return loc, err
 	case *entity.LiteralArray:
 		return this.generateLiteralArrayLoc(expression, nil)
 	case *entity.LiteralString:

generator/expression.go

@@ -3,7 +3,7 @@ package generator
 // import "fmt"
 import "git.tebibyte.media/fspl/fspl/llvm"
 import "git.tebibyte.media/fspl/fspl/entity"
-// import "git.tebibyte.media/fspl/fspl/analyzer"
+import "git.tebibyte.media/fspl/fspl/analyzer"
 
 func (this *generator) generateBlock (block *entity.Block, mode resultMode) (llvm.Value, bool, error) {
 	if len(block.Steps) == 0 { return nil, false, nil }
@@ -196,26 +196,103 @@ func (this *generator) generateLoop (loop *entity.Loop, mode resultMode) (llvm.V
 			Target: exit,
 		})
 	}
+	// FIXME: loopEntry needs to have a list of phi nodes, it's probably
+	// completely broken
 	return loopEntry.value, loopEntry.loc, nil
 }
 
 func (this *generator) generateFor (loop *entity.For, mode resultMode) (llvm.Value, bool, error) {
-	irIndexType, err := this.blockManager.generateTypeIndex()
+	irIndexType, err := this.generateTypeIndex()
 	if err != nil { return nil, false, err }
 
 	// element index
-	var irIndex llvm.Value
+	var irIndexLoc llvm.Value
 	if loop.Index != nil {
-		irIndex, err = this.blockManager.addDeclaration (
+		irIndexLoc, err = this.blockManager.addDeclaration (
 			loop.Index, llvm.NewConstZeroInitializer(irIndexType))
 		if err != nil { return nil, false, err }
+	} else {
+		irIndexLoc = this.blockManager.newAllocaFront(irIndexType)
 	}
 
 	// element value
-	irElement, err := this.blockManager.addDeclaration(loop.Element, nil)
+	irElementLoc, err := this.blockManager.addDeclaration(loop.Element, nil)
+	if err != nil { return nil, false, err }
+	irElementType, err := this.generateType(loop.Element.Type())
+	if err != nil { return nil, false, err }
+
+	// source slice/array
+	irOverLoc, err := this.generateExpressionLoc(loop.Over)
+	if err != nil { return nil, false, err }
+	irOverType, err := this.generateType(loop.Over.Type())
+	if err != nil { return nil, false, err }
+	baseOverType := analyzer.ReduceToBase(loop.Over.Type())
+	array, isArray := baseOverType.(*entity.TypeArray)	
+	
+	previous := this.blockManager.Block
+	header   := this.blockManager.newBlock()
+	body     := this.blockManager.newBlock()
+	exit     := this.blockManager.newBlock()
+	previous.NewBr(header)
+	this.blockManager.Block = header
+
+	loopEntry := this.blockManager.pushLoop(mode)
+	defer this.blockManager.popLoop()
+
+	// check bounds
+	var irLength llvm.Value
+	if isArray {
+		irLength = llvm.NewConstInt(irIndexType, int64(array.Length))
+	} else {
+		irLength = this.blockManager.NewLoad (
+			irIndexType,
+			this.getSliceLengthFieldLoc(irOverLoc, irOverType))
+	}
+	this.blockManager.NewCondBr (
+		this.blockManager.NewICmp (
+			llvm.IPredicateULT,
+			this.blockManager.NewLoad(irIndexType, irIndexLoc),
+			irLength),
+		body, exit)
+
+	this.blockManager.Block = body
+	
+	// set element
+	var irDataLoc llvm.Value
+	if isArray {
+		irDataLoc = irOverLoc
+	} else {
+		irDataLoc = this.blockManager.NewLoad (
+			llvm.Pointer,
+			this.getSliceDataFieldLoc(irOverLoc, irOverType))
+	}
+	this.blockManager.NewStore (
+		this.blockManager.NewGetElementPtr (
+			irElementType, irDataLoc,
+			llvm.NewConstInt(llvm.I32, 0),
+			this.blockManager.NewLoad(irIndexType, irIndexLoc)),
+		irElementLoc)
+
+	_, _, err = this.generateExpressionAny(loop.Body)
 	if err != nil { return nil, false, err }
 	
-	// TODO
+	this.blockManager.NewBr(body)
-	
+	if !this.blockManager.Terminated() {
-	previous := this.
+		// increment index
+		this.blockManager.NewStore (
+			this.blockManager.NewAdd (
+				this.blockManager.NewLoad(irIndexType, irIndexLoc),
+				llvm.NewConstInt(irIndexType, 1)),
+			irIndexLoc)
+	}
+
+	this.blockManager.Block = exit
+	if loopEntry.stub != nil {
+		loopEntry.stub.SetTerminator(&llvm.TerminatorBr {
+			Target: exit,
+		})
+	}
+	// FIXME: loopEntry needs to have a list of phi nodes, it's probably
+	// completely broken
+	return loopEntry.value, loopEntry.loc, nil
 }