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// Copyright 2020 CUE Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package runtime
import (
"path"
"sync"
"cuelang.org/go/cue/build"
"cuelang.org/go/cue/errors"
"cuelang.org/go/internal"
"cuelang.org/go/internal/core/adt"
"cuelang.org/go/internal/cueexperiment"
)
type PackageFunc func(ctx adt.Runtime) (*adt.Vertex, errors.Error)
func RegisterBuiltin(importPath string, f PackageFunc) {
sharedIndex.RegisterBuiltin(importPath, f)
}
func (x *index) RegisterBuiltin(importPath string, f PackageFunc) {
if x.builtinPaths == nil {
x.builtinPaths = map[string]PackageFunc{}
x.builtinShort = map[string]string{}
}
x.builtinPaths[importPath] = f
base := path.Base(importPath)
if _, ok := x.builtinShort[base]; ok {
importPath = "" // Don't allow ambiguous base paths.
}
x.builtinShort[base] = importPath
}
// We use a sync.OnceValue below so that cueexperiment.Init is only called
// the first time that the API is used, letting the user set $CUE_EXPERIMENT globally
// as part of their package init if they want to.
var SharedRuntime = sync.OnceValue(func() *Runtime {
r := &Runtime{index: sharedIndex}
// The version logic below is copied from [Runtime.Init];
// consider refactoring to share the code if it gets any more complicated.
//
// TODO(mvdan,mpvl): Note that SharedRuntime follows the globally set evaluator version,
// which may be different than what was supplied via Go code for each context like
// via cuecontext.EvaluatorVersion(cuecontext.EvalV3).
// This does not cause issues between evalv2 and evalv3 as they use the same ADT,
// but future evaluator versions may not be compatible at that level.
// We should consider using one SharedRuntime per evaluator version,
// or getting rid of SharedRuntime altogether.
cueexperiment.Init()
if cueexperiment.Flags.EvalV3 {
r.version = internal.DevVersion
} else {
r.version = internal.DefaultVersion
}
return r
})
// BuiltinPackagePath converts a short-form builtin package identifier to its
// full path or "" if this doesn't exist.
func (x *Runtime) BuiltinPackagePath(path string) string {
return x.index.shortBuiltinToPath(path)
}
// sharedIndex is used for indexing builtins and any other labels common to
// all instances.
var sharedIndex = newIndex()
// index maps conversions from label names to internal codes.
//
// All instances belonging to the same package should share this index.
type index struct {
// lock is used to guard imports-related maps.
// TODO: makes these per cuecontext.
lock sync.RWMutex
imports map[*adt.Vertex]*build.Instance
importsByPath map[string]*adt.Vertex
importsByBuild map[*build.Instance]*adt.Vertex
nextUniqueID uint64
// These are initialized during Go package initialization time and do not
// need to be guarded.
builtinPaths map[string]PackageFunc // Full path
builtinShort map[string]string // Commandline shorthand
typeCache sync.Map // map[reflect.Type]evaluated
}
func (i *index) getNextUniqueID() uint64 {
// TODO: use atomic increment instead.
i.lock.Lock()
i.nextUniqueID++
x := i.nextUniqueID
i.lock.Unlock()
return x
}
func newIndex() *index {
i := &index{
imports: map[*adt.Vertex]*build.Instance{},
importsByPath: map[string]*adt.Vertex{},
importsByBuild: map[*build.Instance]*adt.Vertex{},
}
return i
}
func (x *index) shortBuiltinToPath(id string) string {
if x == nil || x.builtinPaths == nil {
return ""
}
return x.builtinShort[id]
}
func (r *Runtime) AddInst(path string, key *adt.Vertex, p *build.Instance) {
r.index.lock.Lock()
defer r.index.lock.Unlock()
x := r.index
if key == nil {
panic("key must not be nil")
}
x.imports[key] = p
x.importsByBuild[p] = key
if path != "" {
x.importsByPath[path] = key
}
}
func (r *Runtime) GetInstanceFromNode(key *adt.Vertex) *build.Instance {
r.index.lock.RLock()
defer r.index.lock.RUnlock()
return r.index.imports[key]
}
func (r *Runtime) getNodeFromInstance(key *build.Instance) *adt.Vertex {
r.index.lock.RLock()
defer r.index.lock.RUnlock()
return r.index.importsByBuild[key]
}
func (r *Runtime) LoadImport(importPath string) *adt.Vertex {
r.index.lock.Lock()
defer r.index.lock.Unlock()
x := r.index
key := x.importsByPath[importPath]
if key != nil {
return key
}
if x.builtinPaths != nil {
if f := x.builtinPaths[importPath]; f != nil {
p, err := f(r)
if err != nil {
return adt.ToVertex(&adt.Bottom{Err: err})
}
inst := &build.Instance{
ImportPath: importPath,
PkgName: path.Base(importPath),
}
x.imports[p] = inst
x.importsByPath[importPath] = p
x.importsByBuild[inst] = p
return p
}
}
return key
}
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