102 lines
3.1 KiB
Go
102 lines
3.1 KiB
Go
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package cache
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import (
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"sync"
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"github.com/evanw/esbuild/internal/logger"
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"github.com/evanw/esbuild/internal/runtime"
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)
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// This is a cache of the parsed contents of a set of files. The idea is to be
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// able to reuse the results of parsing between builds and make subsequent
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// builds faster by avoiding redundant parsing work. This only works if:
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//
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// * The AST information in the cache must be considered immutable. There is
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// no way to enforce this in Go, but please be disciplined about this. The
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// ASTs are shared in between builds. Any information that must be mutated
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// in the AST during a build must be done on a shallow clone of the data if
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// the mutation happens after parsing (i.e. a clone that clones everything
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// that will be mutated and shares only the parts that won't be mutated).
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//
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// * The information in the cache must not depend at all on the contents of
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// any file other than the file being cached. Invalidating an entry in the
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// cache does not also invalidate any entries that depend on that file, so
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// caching information that depends on other files can result in incorrect
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// results due to reusing stale data. For example, do not "bake in" some
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// value imported from another file.
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//
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// * Cached ASTs must only be reused if the parsing options are identical
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// between builds. For example, it would be bad if the AST parser depended
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// on options inherited from a nearby "package.json" file but those options
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// were not part of the cache key. Then the cached AST could incorrectly be
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// reused even if the contents of that "package.json" file have changed.
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//
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type CacheSet struct {
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SourceIndexCache SourceIndexCache
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FSCache FSCache
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CSSCache CSSCache
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JSONCache JSONCache
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JSCache JSCache
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}
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func MakeCacheSet() *CacheSet {
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return &CacheSet{
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SourceIndexCache: SourceIndexCache{
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entries: make(map[sourceIndexKey]uint32),
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nextSourceIndex: runtime.SourceIndex + 1,
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},
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FSCache: FSCache{
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entries: make(map[string]*fsEntry),
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},
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CSSCache: CSSCache{
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entries: make(map[logger.Path]*cssCacheEntry),
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},
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JSONCache: JSONCache{
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entries: make(map[logger.Path]*jsonCacheEntry),
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},
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JSCache: JSCache{
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entries: make(map[logger.Path]*jsCacheEntry),
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},
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}
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}
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type SourceIndexCache struct {
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mutex sync.Mutex
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entries map[sourceIndexKey]uint32
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nextSourceIndex uint32
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}
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type SourceIndexKind uint8
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const (
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SourceIndexNormal SourceIndexKind = iota
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SourceIndexJSStubForCSS
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)
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type sourceIndexKey struct {
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path logger.Path
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kind SourceIndexKind
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}
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func (c *SourceIndexCache) LenHint() uint32 {
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c.mutex.Lock()
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defer c.mutex.Unlock()
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// Add some extra room at the end for a new file or two without reallocating
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const someExtraRoom = 16
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return c.nextSourceIndex + someExtraRoom
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}
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func (c *SourceIndexCache) Get(path logger.Path, kind SourceIndexKind) uint32 {
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key := sourceIndexKey{path: path, kind: kind}
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c.mutex.Lock()
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defer c.mutex.Unlock()
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if sourceIndex, ok := c.entries[key]; ok {
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return sourceIndex
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}
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sourceIndex := c.nextSourceIndex
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c.nextSourceIndex++
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c.entries[key] = sourceIndex
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return sourceIndex
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}
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