327 lines
9.9 KiB
Go
327 lines
9.9 KiB
Go
package generator
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// import "fmt"
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import "git.tebibyte.media/fspl/fspl/llvm"
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import "git.tebibyte.media/fspl/fspl/entity"
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import "git.tebibyte.media/fspl/fspl/analyzer"
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func (this *generator) generateBlock (block *entity.Block, mode resultMode) (llvm.Value, bool, error) {
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if len(block.Steps) == 0 { return nil, false, nil }
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lastIndex := len(block.Steps) - 1
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for _, step := range block.Steps[:lastIndex] {
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_, _, err := this.generateExpressionAny(step)
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if err != nil { return nil, false, err }
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}
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return this.generateExpression(block.Steps[lastIndex], mode)
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}
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func (this *generator) generateBreak (brk *entity.Break) (llvm.Value, error) {
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loopEntry := this.blockManager.topLoop()
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var irValue llvm.Value
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if brk.Value != nil {
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var err error
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var loc bool
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thisMode := loopEntry.mode
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if thisMode == resultModeAny && len(loopEntry.breakBlocks) > 0 {
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// there have been previous break statements, so be
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// consistent with the already decided result mode
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loc := loopEntry.loc
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if loc { thisMode = resultModeLoc
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} else { thisMode = resultModeVal }
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}
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irValue, loc, err = this.generateExpression(brk.Value, loopEntry.mode)
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if err != nil { return nil, err }
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loopEntry.loc = loc
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}
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loopEntry.breakBlocks = append(loopEntry.breakBlocks, &llvm.Incoming {
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X: irValue,
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Predecessor: this.blockManager.Block,
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})
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return nil, nil
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}
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func (this *generator) generateReturn (ret *entity.Return) (llvm.Value, error) {
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if ret.Value == nil {
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this.blockManager.NewRet(nil)
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} else {
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value, err := this.generateExpressionVal(ret.Value)
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if err != nil { return nil, err }
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this.blockManager.NewRet(value)
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}
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return nil, nil
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}
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func (this *generator) generateIfElse (ifelse *entity.IfElse, mode resultMode) (llvm.Value, bool, error) {
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condition, err := this.generateExpressionVal(ifelse.Condition)
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if err != nil { return nil, false, err }
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previous := this.blockManager.Block
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var trueBlock, falseBlock *llvm.Block
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var tru, fals llvm.Value
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var loc bool
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var irIncomings []*llvm.Incoming
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trueBlock = this.blockManager.newBlock()
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exitBlock := this.blockManager.newBlock()
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this.blockManager.Block = trueBlock
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tru, loc, err = this.generateExpression(ifelse.True, mode)
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if err != nil { return nil, false, err }
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if !this.blockManager.Terminated() {
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if tru != nil {
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irIncomings = append(irIncomings, &llvm.Incoming {
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X: tru,
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Predecessor: this.blockManager.Block,
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})
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}
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this.blockManager.NewBr(exitBlock)
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}
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if ifelse.False == nil {
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// there is no false case
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previous.NewCondBr(condition, trueBlock, exitBlock)
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this.blockManager.Block = exitBlock
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return nil, loc, nil
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} else {
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// there is a false case
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falseBlock = this.blockManager.newBlock()
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thisMode := mode
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if mode != resultModeAny {
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if loc { thisMode = resultModeLoc
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} else { thisMode = resultModeVal }
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}
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fals, _, err = this.generateExpression(ifelse.False, thisMode)
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if err != nil { return nil, false, err }
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if !this.blockManager.Terminated() {
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if fals != nil {
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irIncomings = append(irIncomings, &llvm.Incoming {
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X: fals,
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Predecessor: this.blockManager.Block,
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})
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}
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this.blockManager.NewBr(exitBlock)
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}
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if mode == resultModeAny {
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// discard results of statements
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previous.NewCondBr(condition, trueBlock, falseBlock)
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this.blockManager.Block = exitBlock
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return nil, false, nil
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} else {
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// obtain results of statements
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// set up phi to capture results
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previous.NewCondBr(condition, trueBlock, falseBlock)
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this.blockManager.Block = exitBlock
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return this.blockManager.NewPhi(irIncomings...), loc, nil
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}
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}
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}
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func (this *generator) generateMatch (match *entity.Match, mode resultMode) (llvm.Value, bool, error) {
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var loc bool
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value, err := this.generateExpressionLoc(match.Value)
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if err != nil { return nil, false, err }
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irUnionType, err := this.generateType(match.Value.Type())
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if err != nil { return nil, false, err }
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previousBlock := this.blockManager.Block
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exitBlock := this.blockManager.newBlock()
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irHashType := llvm.I64
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irCases := make([]*llvm.Case, len(match.Cases))
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irIncomings := []*llvm.Incoming { }
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for index, cas := range match.Cases {
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// set up ir case
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caseBlock := this.blockManager.newBlock()
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hash := match.CaseOrder[index]
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irCases[index] = &llvm.Case {
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X: llvm.NewConstInt(irHashType, int64(hash.Number())),
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Target: caseBlock,
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}
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// create casted variable
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irType, err := this.generateType(cas.Declaration.Type())
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if err != nil { return nil, false, err }
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dataFieldLoc := this.getUnionDataFieldLoc(value, irUnionType)
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data := this.blockManager.NewLoad(irType, dataFieldLoc)
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this.blockManager.addDeclaration(cas.Declaration, data)
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// generate case expression
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thisMode := mode
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if index != 0 && mode != resultModeAny {
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if loc { thisMode = resultModeLoc
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} else { thisMode = resultModeVal }
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}
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caseExpression, thisLoc, err := this.generateExpression(cas.Expression, thisMode)
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if err != nil { return nil, false, err }
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if index == 0 { loc = thisLoc }
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if !this.blockManager.Terminated() {
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if caseExpression != nil {
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irIncomings = append(irIncomings, &llvm.Incoming {
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X: caseExpression,
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Predecessor: this.blockManager.Block,
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})
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}
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this.blockManager.NewBr(exitBlock)
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}
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}
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// create switch branch
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this.blockManager.Block = previousBlock
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hashFieldLoc := this.getUnionTypeFieldLoc(value, irUnionType)
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hash := this.blockManager.NewLoad(irHashType, hashFieldLoc)
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this.blockManager.NewSwitch(hash, exitBlock, irCases...)
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// discard/obtain results
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this.blockManager.Block = exitBlock
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if mode == resultModeAny {
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return nil, false, nil
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} else {
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irType, err := this.generateType(match.Type())
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if err != nil { return nil, false, err }
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irIncomings = append(irIncomings, &llvm.Incoming {
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X: llvm.NewConstZeroInitializer(irType),
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Predecessor: previousBlock,
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})
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return this.blockManager.NewPhi(irIncomings...), loc, nil
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}
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}
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func (this *generator) generateLoop (loop *entity.Loop, mode resultMode) (llvm.Value, bool, error) {
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irResultType, err := this.generateType(loop.Type())
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if err != nil { return nil, false, err }
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previous := this.blockManager.Block
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body := this.blockManager.newBlock()
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exit := this.blockManager.newBlock()
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previous.NewBr(body)
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loopEntry := this.blockManager.pushLoop(mode)
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defer this.blockManager.popLoop()
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this.blockManager.Block = body
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_, _, err = this.generateExpressionAny(loop.Body)
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if err != nil { return nil, false, err }
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final := this.blockManager.Block
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// discard/obtain results
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this.blockManager.Block = exit
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var irValue llvm.Value
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if _, void := irResultType.(*llvm.TypeVoid); void {
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loopEntry.tieUp(exit)
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} else {
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irValue = loopEntry.tieUpPhi(irResultType, exit)
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}
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if !final.Terminated () {
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final.NewBr(body)
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}
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return irValue, loopEntry.loc, nil
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}
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func (this *generator) generateFor (loop *entity.For, mode resultMode) (llvm.Value, bool, error) {
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irIndexType, err := this.generateTypeIndex()
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if err != nil { return nil, false, err }
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irResultType, err := this.generateType(loop.Type())
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if err != nil { return nil, false, err }
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// element index
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var irIndexLoc llvm.Value
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if loop.Index != nil {
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irIndexLoc, err = this.blockManager.addDeclaration (
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loop.Index, llvm.NewConstZeroInitializer(irIndexType))
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if err != nil { return nil, false, err }
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} else {
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irIndexLoc = this.blockManager.newAllocaFront(irIndexType)
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}
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// element value
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irElementLoc, err := this.blockManager.addDeclaration(loop.Element, nil)
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if err != nil { return nil, false, err }
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irElementType, err := this.generateType(loop.Element.Type())
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if err != nil { return nil, false, err }
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// source slice/array
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irOverLoc, err := this.generateExpressionLoc(loop.Over)
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if err != nil { return nil, false, err }
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irOverType, err := this.generateType(loop.Over.Type())
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if err != nil { return nil, false, err }
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baseOverType := analyzer.ReduceToBase(loop.Over.Type())
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array, isArray := baseOverType.(*entity.TypeArray)
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previous := this.blockManager.Block
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header := this.blockManager.newBlock()
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body := this.blockManager.newBlock()
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exit := this.blockManager.newBlock()
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previous.NewBr(header)
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loopEntry := this.blockManager.pushLoop(mode)
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defer this.blockManager.popLoop()
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// check bounds
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this.blockManager.Block = header
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var irLength llvm.Value
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if isArray {
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irLength = llvm.NewConstInt(irIndexType, int64(array.Length))
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} else {
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irLength = this.blockManager.NewLoad (
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irIndexType,
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this.getSliceLengthFieldLoc(irOverLoc, irOverType))
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}
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this.blockManager.NewCondBr (
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this.blockManager.NewICmp (
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llvm.IPredicateULT,
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this.blockManager.NewLoad(irIndexType, irIndexLoc),
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irLength),
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body, exit)
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// set element
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this.blockManager.Block = body
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var irDataLoc llvm.Value
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if isArray {
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irDataLoc = irOverLoc
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} else {
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irDataLoc = this.getSliceDataAddress(irOverLoc, irOverType)
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}
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irElementLocInData := this.blockManager.NewGetElementPtr (
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irElementType, irDataLoc,
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this.blockManager.NewLoad(irIndexType, irIndexLoc))
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this.blockManager.NewStore (
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this.blockManager.NewLoad(irElementType, irElementLocInData),
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irElementLoc)
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// generate loop body
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this.blockManager.Block = body
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_, _, err = this.generateExpressionAny(loop.Body)
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if err != nil { return nil, false, err }
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// increment index
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this.blockManager.NewStore (
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this.blockManager.NewAdd (
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this.blockManager.NewLoad(irIndexType, irIndexLoc),
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llvm.NewConstInt(irIndexType, 1)),
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irIndexLoc)
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// discard/obtain results
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final := this.blockManager.Block
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this.blockManager.Block = exit
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var irValue llvm.Value
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if _, void := irResultType.(*llvm.TypeVoid); void {
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loopEntry.tieUp(exit)
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} else {
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irValue = loopEntry.tieUpPhi(irResultType, exit, &llvm.Incoming {
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X: llvm.NewConstZeroInitializer(irResultType),
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Predecessor: header,
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})
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}
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// loop back around
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if !final.Terminated () {
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final.NewBr(header)
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}
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return irValue, loopEntry.loc, nil
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}
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