wip qbe support

asm/qbe/qbe.go

@@ -1 +1,99 @@
 package qbe
+
+import (
+	"fmt"
+	"io"
+
+	"robaertschi.xyz/robaertschi/tt/ast"
+	"robaertschi.xyz/robaertschi/tt/ttir"
+
+	_ "embed"
+)
+
+//go:embed qbe_stub.asm
+var Stub string
+
+func emitf(w io.Writer, format string, args ...any) error {
+	_, err := w.Write([]byte(fmt.Sprintf(format, args...)))
+	return err
+}
+
+func Emit(output io.Writer, input *ttir.Program) error {
+	for _, f := range input.Functions {
+		err := emitFunction(output, f)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func emitFunction(w io.Writer, f ttir.Function) error {
+	emitf(w, "export function ")
+	if f.HasReturnValue {
+		if err := emitf(w, "l "); err != nil {
+			return err
+		}
+	}
+	if err := emitf(w, "$%s() {\n@start\n", f.Name); err != nil {
+		return err
+	}
+	for _, i := range f.Instructions {
+		if err := emitInstruction(w, i); err != nil {
+			return err
+		}
+	}
+	return emitf(w, "}\n")
+}
+
+func emitOperand(op ttir.Operand) string {
+	switch op := op.(type) {
+	case *ttir.Constant:
+		return fmt.Sprintf("%d", op.Value)
+	case *ttir.Var:
+		return "%" + op.Value
+	}
+	panic(fmt.Sprintf("invalid operand %T", op))
+}
+
+func emitInstruction(w io.Writer, i ttir.Instruction) error {
+	switch i := i.(type) {
+	case *ttir.Ret:
+		if op := i.Op; op != nil {
+			if err := emitf(w, "\tret %s\n", emitOperand(i.Op)); err != nil {
+				return err
+			}
+		} else {
+			if err := emitf(w, "\tret\n"); err != nil {
+				return err
+			}
+
+		}
+	case *ttir.Binary:
+		var inst string
+		switch i.Operator {
+		case ast.Add:
+			inst = "add"
+		case ast.Subtract:
+			inst = "sub"
+		case ast.Multiply:
+			inst = "mul"
+		case ast.Divide:
+			inst = "div"
+		case ast.GreaterThan:
+			inst = "csgtl"
+		case ast.GreaterThanEqual:
+			inst = "csgel"
+		case ast.LessThan:
+			inst = "csltl"
+		case ast.LessThanEqual:
+			inst = "cslel"
+		}
+		if err := emitf(w, "\t%s =l %s %s, %s\n", emitOperand(i.Dst), inst, emitOperand(i.Lhs), emitOperand(i.Rhs)); err != nil {
+			return err
+		}
+
+	}
+
+	return nil
+}

build/build.go

@@ -10,6 +10,7 @@ import (
 	"strings"
 
 	"robaertschi.xyz/robaertschi/tt/asm"
+	"robaertschi.xyz/robaertschi/tt/asm/qbe"
 	"robaertschi.xyz/robaertschi/tt/utils"
 )
 
@@ -73,9 +74,16 @@ func (sp *SourceProgram) Build(backend asm.Backend, emitAsmOnly bool, toPrint To
 		return id - 1
 	}
 
-	err := sp.buildFasm(addRootNode, addNode, emitAsmOnly, toPrint)
+	if backend == asm.Fasm {
-	if err != nil {
+		err := sp.buildFasm(addRootNode, addNode, emitAsmOnly, toPrint)
-		return err
+		if err != nil {
+			return err
+		}
+	} else if backend == asm.Qbe {
+		err := sp.buildQbe(addRootNode, addNode, emitAsmOnly, toPrint)
+		if err != nil {
+			return err
+		}
 	}
 
 	return runTasks(nodes, rootNodes, l)
@@ -93,7 +101,7 @@ func (sp *SourceProgram) buildFasm(addRootNode func(task) int, addNode func(task
 	mainAsmOutput := strings.TrimSuffix(sp.InputFile, filepath.Ext(sp.InputFile)) + ".asm"
 
 	asmFile := addRootNode(NewFuncTask("generating assembly for "+sp.InputFile, func(output io.Writer) error {
-		return build(output, sp.InputFile, mainAsmOutput, toPrint)
+		return build(output, sp.InputFile, mainAsmOutput, toPrint, asm.Fasm)
 	}))
 
 	if !emitAsmOnly {
@@ -108,3 +116,80 @@ func (sp *SourceProgram) buildFasm(addRootNode func(task) int, addNode func(task
 
 	return nil
 }
+
+func (sp *SourceProgram) buildQbe(addRootNode func(task) int, addNode func(task, ...int) int, emitAsmOnly bool, toPrint ToPrintFlags) error {
+	fasmPath, err := exec.LookPath("fasm")
+	if err != nil {
+		fasmPath, err = exec.LookPath("fasm2")
+		if err != nil {
+			return fmt.Errorf("could not find fasm or fasm2, please install any those two using your systems package manager or from https://flatassembler.net")
+		}
+	}
+	qbePath, err := exec.LookPath("qbe")
+	if err != nil {
+		return fmt.Errorf("could not find qbe, please install using your systems package manager or from https://https://c9x.me/compile")
+	}
+
+	asPath, err := exec.LookPath("as")
+	if err != nil {
+		return fmt.Errorf("could not find the system `as` assembler, please install it using your systems package manager")
+	}
+
+	ldPath, err := exec.LookPath("ld")
+	if err != nil {
+		return fmt.Errorf("could not find the system `ld` linker, please install it using your systems package manager")
+	}
+
+	mainAsmOutput := strings.TrimSuffix(sp.InputFile, filepath.Ext(sp.InputFile)) + ".qbe"
+
+	asmFile := addRootNode(NewFuncTask("generating assembly for "+sp.InputFile, func(output io.Writer) error {
+		return build(output, sp.InputFile, mainAsmOutput, toPrint, asm.Qbe)
+	}))
+
+	if !emitAsmOnly {
+
+		objectFileTasks := []int{}
+		qbeStubAsm := "qbe_stub.asm"
+		qbeStubO := "qbe_stub.o"
+		generatedAsmFile := addRootNode(NewCreateFileTask(qbeStubAsm, qbe.Stub))
+		id := addNode(NewProcessTask(fasmPath, qbeStubAsm, qbeStubO), generatedAsmFile)
+		objectFileTasks = append(objectFileTasks, id)
+		sp.ObjectFiles = append(sp.ObjectFiles, qbeStubO)
+
+		qbeOutput := strings.TrimSuffix(mainAsmOutput, filepath.Ext(mainAsmOutput)) + ".S"
+		task := NewProcessTask(qbePath, mainAsmOutput, "-o", qbeOutput)
+		task.WithName("running qbe on " + mainAsmOutput)
+		qbeTask := addNode(task, asmFile)
+		sp.InputAssemblies = append(sp.InputAssemblies, qbeOutput)
+
+		for _, asmFile := range sp.InputAssemblies {
+			outputFile := strings.TrimSuffix(asmFile, filepath.Ext(asmFile)) + ".o"
+
+			if filepath.Ext(asmFile) == ".asm" {
+				id := addRootNode(NewProcessTask(fasmPath, asmFile, outputFile))
+				objectFileTasks = append(objectFileTasks, id)
+			} else if filepath.Ext(asmFile) == ".S" {
+				id := addRootNode(NewProcessTask(asPath, asmFile, "-o", outputFile))
+				objectFileTasks = append(objectFileTasks, id)
+			} else {
+				panic(fmt.Sprintf("unkown asm file extension %q", filepath.Ext(asmFile)))
+			}
+
+			sp.ObjectFiles = append(sp.ObjectFiles, outputFile)
+		}
+		ldTask := NewProcessTask(ldPath, append([]string{"-o", sp.OutputFile}, sp.ObjectFiles...)...)
+		ldTaskId := addNode(ldTask, append([]int{generatedAsmFile}, objectFileTasks...)...)
+
+		for _, object := range sp.ObjectFiles {
+			// Cleanup object files
+			addNode(NewRemoveFileTask(object), ldTaskId)
+		}
+
+		// Cleanup
+		addNode(NewRemoveFileTask(mainAsmOutput), ldTaskId, qbeTask)
+		addNode(NewRemoveFileTask(qbeStubAsm), ldTaskId, generatedAsmFile)
+		addNode(NewRemoveFileTask(qbeOutput), ldTaskId)
+	}
+
+	return nil
+}

build/task.go

@@ -9,7 +9,9 @@ import (
 	"slices"
 	"strings"
 
+	"robaertschi.xyz/robaertschi/tt/asm"
 	"robaertschi.xyz/robaertschi/tt/asm/amd64"
+	"robaertschi.xyz/robaertschi/tt/asm/qbe"
 	"robaertschi.xyz/robaertschi/tt/lexer"
 	"robaertschi.xyz/robaertschi/tt/parser"
 	"robaertschi.xyz/robaertschi/tt/token"
@@ -84,6 +86,42 @@ func (rft *removeFileTask) Name() string { return rft.name }
 
 func (rft *removeFileTask) WithName(name string) { rft.name = name }
 
+type createFileTask struct {
+	file    string
+	content string
+	name    string
+}
+
+func NewCreateFileTask(file string, content string) task {
+	return &createFileTask{
+		file:    file,
+		content: content,
+		name:    fmt.Sprintf("writing file %q", file),
+	}
+}
+
+func (cft *createFileTask) Run(id int, output io.Writer, doneChan chan taskResult) {
+	file, err := os.Create(cft.file)
+	if err != nil {
+		doneChan <- taskResult{
+			Id:  id,
+			Err: err,
+		}
+		return
+	}
+
+	_, err = file.WriteString(cft.content)
+	doneChan <- taskResult{
+		Id:  id,
+		Err: err,
+	}
+	return
+}
+
+func (cft *createFileTask) Name() string { return cft.name }
+
+func (cft *createFileTask) WithName(name string) { cft.name = name }
+
 type funcTask struct {
 	f    func(io.Writer) error
 	name string
@@ -108,7 +146,7 @@ func (rft *funcTask) WithName(name string) {
 	rft.name = name
 }
 
-func build(outputWriter io.Writer, input string, output string, toPrint ToPrintFlags) error {
+func build(outputWriter io.Writer, input string, output string, toPrint ToPrintFlags, backend asm.Backend) error {
 	file, err := os.Open(input)
 	if err != nil {
 		return fmt.Errorf("could not open file %q because: %v", input, err)
@@ -158,19 +196,26 @@ func build(outputWriter io.Writer, input string, output string, toPrint ToPrintF
 		io.WriteString(outputWriter,
 			fmt.Sprintf("TTIR:\n%s\n%+#v\n", ir.String(), ir))
 	}
-	asm := amd64.CgProgram(ir)
-
-	asmOutput := asm.Emit()
 
 	asmOutputFile, err := os.Create(output)
 	if err != nil {
 		return fmt.Errorf("failed to create/truncate asm file %q because: %v\n", output, err)
 	}
+	defer asmOutputFile.Close()
+
+	if backend == asm.Fasm {
+		asm := amd64.CgProgram(ir)
+		asmOutput := asm.Emit()
+		_, err = asmOutputFile.WriteString(asmOutput)
+		if err != nil {
+			return fmt.Errorf("failed to write to file %q because: %v\n", output, err)
+		}
+	} else if backend == asm.Qbe {
+		err := qbe.Emit(asmOutputFile, ir)
+		if err != nil {
+			return fmt.Errorf("failed to write to file %q because: %v\n", output, err)
+		}
 
-	_, err = asmOutputFile.WriteString(asmOutput)
-	asmOutputFile.Close()
-	if err != nil {
-		return fmt.Errorf("failed to write to file %q because: %v\n", output, err)
 	}
 
 	return nil
@@ -284,7 +329,9 @@ func runTasks(nodes map[int]*node, rootNodes []int, l *utils.Logger) error {
 	}
 
 	for id, node := range nodes {
-		if output[id].Len() > 0 {
+		if output[id] == nil {
+			l.Errorf("output of task %q is nil", nodes[id].task.Name())
+		} else if output[id].Len() > 0 {
 			l.Infof("task %q output: %s", node.task.Name(), output[id])
 		}
 	}

main.go

@@ -14,18 +14,20 @@ import (
 )
 
 func main() {
-	err := term.EnterRawMode()
+	// err := term.EnterRawMode()
-	if err != nil {
+	// if err != nil {
-		fmt.Printf("could not enter raw mode %v", err)
+	// 	fmt.Printf("could not enter raw mode %v", err)
-		return
+	// 	return
-	}
+	// }
-	defer term.LeaveRawMode()
+	// defer term.LeaveRawMode()
 
 	flag.Usage = func() {
 		fmt.Fprintf(flag.CommandLine.Output(), "Usage of %s [flags] input\nPossible flags:\n", os.Args[0])
 		flag.PrintDefaults()
 	}
 
+	qbe := flag.Bool("qbe", false, "Use the qbe backend")
+
 	var output string
 	flag.StringVar(&output, "o", "", "Output a executable named `file`")
 	flag.StringVar(&output, "output", "", "Output a executable named `file`")
@@ -59,7 +61,12 @@ func main() {
 
 	logger := log.New(os.Stderr, "", log.Lshortfile)
 
-	err = build.NewSourceProgram(input, output).Build(asm.Fasm, *emitAsmOnly, build.ToPrintFlags(toPrint))
+	backend := asm.Fasm
+	if *qbe {
+		backend = asm.Qbe
+	}
+
+	err := build.NewSourceProgram(input, output).Build(backend, *emitAsmOnly, build.ToPrintFlags(toPrint))
 	if err != nil {
 		logger.Fatalln(err)
 		term.Exit(1)