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compiler.go
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compiler.go
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package compiler
import (
"errors"
"fmt"
"path/filepath"
"github.com/dcaiafa/nitro/internal/errlogger"
"github.com/dcaiafa/nitro/internal/export"
"github.com/dcaiafa/nitro/internal/fs"
"github.com/dcaiafa/nitro/internal/mod"
"github.com/dcaiafa/nitro/internal/vm"
)
var ErrCircularDependency = errors.New("circular dependency")
type Compiler struct {
pkgs []*vm.CompiledPackage
pkgMap map[string]int // package_name => pkgs index
inflight map[string]bool // package_name
fs fs.FS
packageResolver *mod.PackageResolver
errLogger *errlogger.ErrLoggerWrapper
}
func New() *Compiler {
c := &Compiler{
pkgMap: make(map[string]int),
inflight: make(map[string]bool),
fs: fs.NewNative(),
packageResolver: mod.NewPackageResolver(),
}
c.errLogger = errlogger.NewErrLoggerBase(
&errlogger.ConsoleErrLogger{})
return c
}
func (c *Compiler) SetFS(fs fs.FS) {
c.fs = fs
}
func (c *Compiler) RegisterBuiltins(pkgName string, exports export.Exports) {
if _, ok := c.pkgMap[pkgName]; ok {
panic("built-in package already registered")
}
pkg := &vm.CompiledPackage{
Name: pkgName,
Builtin: true,
Literals: make([]vm.Value, len(exports)),
Symbols: make(map[string]int, len(exports)),
}
for i, export := range exports {
pkg.Literals[i] = export.Value()
pkg.Symbols[export.N] = i
}
c.pkgs = append(c.pkgs, pkg)
pkgIndex := len(c.pkgs) - 1
c.pkgMap[pkgName] = pkgIndex
}
func (c *Compiler) Compile(programFile string) (*vm.Program, error) {
root := filepath.Dir(programFile)
manifest, err := mod.ReadManifest(c.fs, root)
if err != nil {
return nil, err
}
err = c.packageResolver.AddModule(&mod.Module{
Name: manifest.Module,
Path: root,
})
if err != nil {
return nil, err
}
packageName := manifest.Module
c.inflight[packageName] = true
pkgCompiler := packageCompiler{
ModuleRoot: root,
ModuleName: manifest.Module,
PackageName: manifest.Module,
PackageGetter: c,
ProgramPath: programFile,
ErrLogger: c.errLogger,
FS: c.fs,
}
pkg, err := pkgCompiler.Compile()
if err != nil {
return nil, err
}
c.pkgs = append(c.pkgs, pkg)
pkg.Index = len(c.pkgs) - 1
c.pkgMap[packageName] = pkg.Index
prog := &vm.Program{
Packages: c.pkgs,
}
return prog, nil
}
func (c *Compiler) compilePackage(packageName string) (*vm.CompiledPackage, error) {
if _, ok := c.pkgMap[packageName]; ok {
panic("package already compiled")
}
if c.inflight[packageName] {
return nil, fmt.Errorf("%w: %v", ErrCircularDependency, packageName)
}
packageInfo, err := c.packageResolver.ResolvePackage(packageName)
if err != nil {
return nil, err
}
c.inflight[packageName] = true
pkgCompiler := packageCompiler{
ModuleRoot: packageInfo.Module.Path,
ModuleName: packageInfo.Module.Name,
PackageName: packageName,
PackageGetter: c,
PackagePath: packageInfo.Path,
ErrLogger: c.errLogger,
FS: c.fs,
}
pkg, err := pkgCompiler.Compile()
if err != nil {
return nil, err
}
delete(c.inflight, packageName)
c.pkgs = append(c.pkgs, pkg)
pkg.Index = len(c.pkgs) - 1
c.pkgMap[packageName] = pkg.Index
return pkg, nil
}
func (c *Compiler) getPackage(packageName string) (*vm.CompiledPackage, error) {
// Have we compiled this package already?
pkgIndex, ok := c.pkgMap[packageName]
if ok {
return c.pkgs[pkgIndex], nil
}
return c.compilePackage(packageName)
}
func (c *Compiler) getAllDeps() []*vm.CompiledPackage {
return c.pkgs
}