Implemented function calls
This commit is contained in:
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086998a0c3
commit
76db8feee3
@ -1,8 +1,12 @@
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main() {
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hello()
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}
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hello() {
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write := 1
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stdout := 1
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exit := 60
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address := 4194305
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length := 3
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syscall(write, stdout, 4194305, 3)
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syscall(exit, 0)
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syscall(write, stdout, address, length)
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}
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@ -1,12 +1,18 @@
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package build
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import (
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"git.akyoto.dev/cli/q/src/build/arch/x64"
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"git.akyoto.dev/cli/q/src/build/asm"
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"git.akyoto.dev/cli/q/src/build/os/linux"
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)
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// Finalize generates the final machine code.
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func Finalize(functions map[string]*Function) ([]byte, []byte) {
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a := asm.New()
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a := entry()
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main := functions["main"]
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delete(functions, "main")
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a.Merge(&main.Assembler)
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for _, f := range functions {
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a.Merge(&f.Assembler)
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@ -15,3 +21,16 @@ func Finalize(functions map[string]*Function) ([]byte, []byte) {
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code, data := a.Finalize()
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return code, data
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}
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// entry returns the entry point of the executable.
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// The only job of the entry function is to call `main` and exit cleanly.
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// The reason we call `main` instead of using `main` itself is to place
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// a return address on the stack, which allows return statements in `main`.
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func entry() *asm.Assembler {
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entry := asm.New()
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entry.Call("main")
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entry.MoveRegisterNumber(x64.SyscallArgs[0], linux.Exit)
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entry.MoveRegisterNumber(x64.SyscallArgs[1], 0)
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entry.Syscall()
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return entry
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}
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@ -6,7 +6,6 @@ import (
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"git.akyoto.dev/cli/q/src/build/arch/x64"
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"git.akyoto.dev/cli/q/src/build/asm"
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"git.akyoto.dev/cli/q/src/build/config"
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"git.akyoto.dev/cli/q/src/build/expression"
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"git.akyoto.dev/cli/q/src/build/fs"
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"git.akyoto.dev/cli/q/src/build/token"
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@ -27,11 +26,7 @@ type Function struct {
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// Compile turns a function into machine code.
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func (f *Function) Compile() {
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if config.Verbose {
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ansi.Bold.Println(f.Name)
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ansi.Dim.Println("╭────────────────────────────────────────────────────────────")
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}
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f.Assembler.Label(f.Name)
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start := 0
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groupLevel := 0
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@ -76,17 +71,11 @@ func (f *Function) Compile() {
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}
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f.Assembler.Return()
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if config.Verbose {
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ansi.Dim.Println("╰────────────────────────────────────────────────────────────")
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f.PrintAsm()
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}
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}
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// PrintAsm shows the assembly instructions.
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func (f *Function) PrintAsm() {
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fmt.Println()
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ansi.Bold.Println(f.Name + ".asm")
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ansi.Bold.Println(f.Name)
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ansi.Dim.Println("╭────────────────────────────────────────────────────────────")
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for _, x := range f.Assembler.Instructions {
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@ -105,11 +94,6 @@ func (f *Function) PrintAsm() {
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// CompileInstruction compiles a single instruction.
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func (f *Function) CompileInstruction(line token.List) error {
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if config.Verbose {
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ansi.Dim.Print("│ ")
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fmt.Println(line)
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}
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if len(line) == 0 {
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return nil
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}
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@ -117,6 +101,12 @@ func (f *Function) CompileInstruction(line token.List) error {
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if line[0].Kind == token.Keyword {
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switch line[0].Text() {
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case "return":
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if len(line) > 1 {
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value := expression.Parse(line[1:])
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defer value.Close()
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// TODO: Set the return value
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}
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f.Assembler.Return()
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default:
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@ -132,11 +122,7 @@ func (f *Function) CompileInstruction(line token.List) error {
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defer expr.Close()
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if config.Verbose {
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ansi.Dim.Printf("│ %s\n", expr)
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}
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if expr.Token.Kind == token.Number || expr.Token.Kind == token.Identifier {
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if expr.Token.Kind == token.Number || expr.Token.Kind == token.Identifier || expr.Token.Kind == token.String {
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return errors.New(&errors.InvalidInstruction{Instruction: expr.Token.Text()}, f.File, expr.Token.Position)
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}
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@ -159,7 +145,8 @@ func (f *Function) CompileInstruction(line token.List) error {
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return nil
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}
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if expr.Token.Text() == "λ" && expr.Children[0].Token.Text() == "syscall" {
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if expr.Token.Text() == "λ" {
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funcName := expr.Children[0].Token.Text()
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parameters := expr.Children[1:]
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for i, parameter := range parameters {
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@ -189,7 +176,12 @@ func (f *Function) CompileInstruction(line token.List) error {
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}
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}
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f.Assembler.Syscall()
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if funcName == "syscall" {
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f.Assembler.Syscall()
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} else {
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f.Assembler.Call(funcName)
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}
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return nil
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}
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@ -4,7 +4,6 @@ import (
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"encoding/binary"
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"git.akyoto.dev/cli/q/src/build/arch/x64"
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"git.akyoto.dev/cli/q/src/build/config"
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)
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// Assembler contains a list of instructions.
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@ -23,19 +22,14 @@ func New() *Assembler {
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func (a *Assembler) Finalize() ([]byte, []byte) {
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code := make([]byte, 0, len(a.Instructions)*8)
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data := make([]byte, 0, 16)
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labels := map[string]Address{}
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pointers := []Pointer{}
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for _, x := range a.Instructions {
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switch x.Mnemonic {
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case MOVE:
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code = x64.MoveRegNum32(code, uint8(x.Data.(*RegisterNumber).Register), uint32(x.Data.(*RegisterNumber).Number))
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if x.Data.(*RegisterNumber).IsPointer {
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pointers = append(pointers, Pointer{
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Position: Address(len(code) - 4),
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Address: Address(x.Data.(*RegisterNumber).Number),
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})
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}
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regNum := x.Data.(*RegisterNumber)
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code = x64.MoveRegNum32(code, uint8(regNum.Register), uint32(regNum.Number))
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case RETURN:
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code = x64.Return(code)
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@ -43,17 +37,33 @@ func (a *Assembler) Finalize() ([]byte, []byte) {
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case SYSCALL:
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code = x64.Syscall(code)
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case CALL:
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code = x64.Call(code, 0x00_00_00_00)
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label := x.Data.(*Label)
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nextInstructionAddress := len(code)
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pointers = append(pointers, Pointer{
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Position: Address(len(code) - 4),
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Resolve: func() Address {
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destination := labels[label.Name]
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distance := int32(destination) - int32(nextInstructionAddress)
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return Address(distance)
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},
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})
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case LABEL:
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labels[x.Data.(*Label).Name] = Address(len(code))
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default:
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panic("Unknown mnemonic: " + x.Mnemonic.String())
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}
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}
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dataStart := config.BaseAddress + config.CodeOffset + Address(len(code))
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// dataStart := config.BaseAddress + config.CodeOffset + Address(len(code))
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for _, pointer := range pointers {
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slice := code[pointer.Position : pointer.Position+4]
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address := dataStart + pointer.Address
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binary.LittleEndian.PutUint32(slice, address)
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binary.LittleEndian.PutUint32(slice, pointer.Resolve())
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}
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return code, data
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@ -7,21 +7,28 @@ func (a *Assembler) MoveRegisterNumber(reg cpu.Register, number uint64) {
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a.Instructions = append(a.Instructions, Instruction{
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Mnemonic: MOVE,
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Data: &RegisterNumber{
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Register: reg,
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Number: number,
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IsPointer: false,
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Register: reg,
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Number: number,
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},
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})
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}
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// MoveRegisterAddress moves an address into the given register.
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func (a *Assembler) MoveRegisterAddress(reg cpu.Register, address Address) {
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// Label adds a label at the current position.
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func (a *Assembler) Label(name string) {
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a.Instructions = append(a.Instructions, Instruction{
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Mnemonic: MOVE,
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Data: &RegisterNumber{
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Register: reg,
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Number: uint64(address),
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IsPointer: true,
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Mnemonic: LABEL,
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Data: &Label{
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Name: name,
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},
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})
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}
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// Call calls a function whose position is identified by a label.
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func (a *Assembler) Call(name string) {
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a.Instructions = append(a.Instructions, Instruction{
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Mnemonic: CALL,
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Data: &Label{
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Name: name,
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},
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})
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}
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11
src/build/asm/Label.go
Normal file
11
src/build/asm/Label.go
Normal file
@ -0,0 +1,11 @@
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package asm
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// Label represents a jump label.
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type Label struct {
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Name string
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}
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// String returns a human readable version.
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func (data *Label) String() string {
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return data.Name
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}
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@ -7,6 +7,8 @@ const (
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MOVE
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RETURN
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SYSCALL
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LABEL
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CALL
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)
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// String returns a human readable version.
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@ -20,6 +22,12 @@ func (m Mnemonic) String() string {
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case SYSCALL:
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return "syscall"
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case LABEL:
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return "label"
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case CALL:
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return "call"
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}
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return "NONE"
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@ -5,8 +5,8 @@ type Address = uint32
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// Pointer stores a relative memory address that we can later turn into an absolute one.
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// Position: The machine code offset where the address was inserted.
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// Address: The offset inside the section.
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// Resolve: The function that will return the final address.
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type Pointer struct {
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Position uint32
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Address uint32
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Position Address
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Resolve func() Address
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}
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@ -8,9 +8,8 @@ import (
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// RegisterNumber operates with a register and a number.
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type RegisterNumber struct {
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Register cpu.Register
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Number uint64
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IsPointer bool
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Register cpu.Register
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Number uint64
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}
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// String returns a human readable version.
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@ -42,6 +42,12 @@ func Build(args []string) int {
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return 1
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}
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if config.Verbose {
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for _, function := range result {
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function.PrintAsm()
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}
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}
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if !writeExecutable {
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return 0
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}
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main() {
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()
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1+(2*3)
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(1+2)
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f(x)
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(a+b)(c)
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return 1+2*3
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}
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