Improved code layout

This commit is contained in:
Eduard Urbach 2024-06-21 12:48:01 +02:00
parent 2c6999040d
commit 1058970be3
Signed by: akyoto
GPG Key ID: C874F672B1AF20C0
4 changed files with 133 additions and 110 deletions

View File

@ -19,8 +19,8 @@ func New(files ...string) *Build {
// Run parses the input files and generates an executable file.
func (build *Build) Run() (map[string]*Function, error) {
functions, errors := Scan(build.Files)
return Compile(functions, errors)
functions, errors := scan(build.Files)
return compile(functions, errors)
}
// Executable returns the path to the executable.

View File

@ -73,6 +73,123 @@ func (f *Function) Compile() {
f.Assembler.Return()
}
// CompileInstruction compiles a single instruction.
func (f *Function) CompileInstruction(line token.List) error {
if len(line) == 0 {
return nil
}
if line[0].Kind == token.Keyword {
return f.CompileKeyword(line)
}
expr := expression.Parse(line)
if expr == nil {
return nil
}
defer expr.Close()
if isVariableDefinition(expr) {
return f.CompileVariableDefinition(expr)
}
if isFunctionCall(expr) {
return f.CompileFunctionCall(expr)
}
return errors.New(&errors.InvalidInstruction{Instruction: expr.Token.Text()}, f.File, expr.Token.Position)
}
// CompileKeyword compiles an instruction that starts with a keyword.
func (f *Function) CompileKeyword(line token.List) error {
switch line[0].Text() {
case "return":
if len(line) > 1 {
value := expression.Parse(line[1:])
defer value.Close()
// TODO: Set the return value
}
f.Assembler.Return()
default:
return errors.New(&errors.KeywordNotImplemented{Keyword: line[0].Text()}, f.File, line[0].Position)
}
return nil
}
// CompileVariableDefinition compiles a variable definition.
func (f *Function) CompileVariableDefinition(expr *expression.Expression) error {
if len(expr.Children) < 2 {
return errors.New(errors.MissingAssignValue, f.File, expr.LastChild().Token.After())
}
name := expr.Children[0].Token.Text()
_, exists := f.Variables[name]
if exists {
return errors.New(&errors.VariableAlreadyExists{Name: name}, f.File, expr.Children[0].Token.Position)
}
value := expr.Children[1]
// All expressions are returned to the memory pool.
// To avoid losing variable values, we will detach it from the expression.
expr.RemoveChild(value)
f.Variables[name] = &Variable{
Name: name,
Value: value,
IsConst: true,
}
return nil
}
// CompileFunctionCall compiles a function call.
func (f *Function) CompileFunctionCall(expr *expression.Expression) error {
funcName := expr.Children[0].Token.Text()
parameters := expr.Children[1:]
for i, parameter := range parameters {
switch parameter.Token.Kind {
case token.Identifier:
name := parameter.Token.Text()
variable, exists := f.Variables[name]
if !exists {
panic("Unknown identifier " + name)
}
if !variable.IsConst {
panic("Not implemented yet")
}
n, _ := strconv.Atoi(variable.Value.Token.Text())
f.Assembler.MoveRegisterNumber(x64.SyscallArgs[i], uint64(n))
case token.Number:
value := parameter.Token.Text()
n, _ := strconv.Atoi(value)
f.Assembler.MoveRegisterNumber(x64.SyscallArgs[i], uint64(n))
default:
panic("Unknown expression")
}
}
if funcName == "syscall" {
f.Assembler.Syscall()
} else {
f.Assembler.Call(funcName)
}
return nil
}
// PrintAsm shows the assembly instructions.
func (f *Function) PrintAsm() {
ansi.Bold.Println(f.Name)
@ -92,111 +209,17 @@ func (f *Function) PrintAsm() {
ansi.Dim.Println("╰────────────────────────────────────────────────────────────")
}
// CompileInstruction compiles a single instruction.
func (f *Function) CompileInstruction(line token.List) error {
if len(line) == 0 {
return nil
}
if line[0].Kind == token.Keyword {
switch line[0].Text() {
case "return":
if len(line) > 1 {
value := expression.Parse(line[1:])
defer value.Close()
// TODO: Set the return value
}
f.Assembler.Return()
default:
return errors.New(&errors.KeywordNotImplemented{Keyword: line[0].Text()}, f.File, line[0].Position)
}
}
expr := expression.Parse(line)
if expr == nil {
return nil
}
defer expr.Close()
if expr.Token.Kind == token.Number || expr.Token.Kind == token.Identifier || expr.Token.Kind == token.String {
return errors.New(&errors.InvalidInstruction{Instruction: expr.Token.Text()}, f.File, expr.Token.Position)
}
if expr.Token.Text() == ":=" {
if len(expr.Children) < 2 {
return errors.New(errors.MissingAssignValue, f.File, expr.LastChild().Token.After())
}
name := expr.Children[0].Token.Text()
_, exists := f.Variables[name]
if exists {
return errors.New(&errors.VariableAlreadyExists{Name: name}, f.File, expr.Children[0].Token.Position)
}
value := expr.Children[1]
// All expressions are returned to the memory pool.
// To avoid losing variable values, we will remove it from the expression.
expr.RemoveChild(value)
f.Variables[name] = &Variable{
Name: name,
Value: value,
IsConst: true,
}
return nil
}
if expr.Token.Text() == "λ" {
funcName := expr.Children[0].Token.Text()
parameters := expr.Children[1:]
for i, parameter := range parameters {
switch parameter.Token.Kind {
case token.Identifier:
name := parameter.Token.Text()
variable, exists := f.Variables[name]
if !exists {
panic("Unknown identifier " + name)
}
if !variable.IsConst {
panic("Not implemented yet")
}
n, _ := strconv.Atoi(variable.Value.Token.Text())
f.Assembler.MoveRegisterNumber(x64.SyscallArgs[i], uint64(n))
case token.Number:
value := parameter.Token.Text()
n, _ := strconv.Atoi(value)
f.Assembler.MoveRegisterNumber(x64.SyscallArgs[i], uint64(n))
default:
panic("Unknown expression")
}
}
if funcName == "syscall" {
f.Assembler.Syscall()
} else {
f.Assembler.Call(funcName)
}
return nil
}
return nil
}
// String returns the function name.
func (f *Function) String() string {
return f.Name
}
// isVariableDefinition returns true if the expression is a variable definition.
func isVariableDefinition(expr *expression.Expression) bool {
return expr.Token.Kind == token.Operator && expr.Token.Text() == ":="
}
// isFunctionCall returns true if the expression is a function call.
func isFunctionCall(expr *expression.Expression) bool {
return expr.Token.Kind == token.Operator && expr.Token.Text() == "λ"
}

View File

@ -4,8 +4,8 @@ import (
"sync"
)
// Compile compiles all the functions.
func Compile(functions <-chan *Function, errors <-chan error) (map[string]*Function, error) {
// compile waits for all functions to finish compilation.
func compile(functions <-chan *Function, errors <-chan error) (map[string]*Function, error) {
allFunctions := map[string]*Function{}
for functions != nil || errors != nil {

View File

@ -11,8 +11,8 @@ import (
"git.akyoto.dev/cli/q/src/errors"
)
// Scan scans the directory.
func Scan(files []string) (<-chan *Function, <-chan error) {
// scan scans the directory.
func scan(files []string) (<-chan *Function, <-chan error) {
functions := make(chan *Function)
errors := make(chan error)