// Package cache implements a build artifact cache.
package cache

import (
	"bytes"
	"crypto/sha256"
	"encoding/hex"
	"errors"
	"fmt"
	"internal/godebug"
	"io"
	"io/fs"
	"os"
	"path/filepath"
	"strconv"
	"strings"
	"time"

	"cmd/go/internal/lockedfile"
	"cmd/go/internal/mmap"
)

// An ActionID is a cache action key, the hash of a complete description of a

// license that can be found in the LICENSE file.

package ssa

import (
	"cmd/internal/obj"
	"sort"
)

// A Cache holds reusable compiler state.
// It is intended to be re-used for multiple Func compilations.
type Cache struct {
	// Storage for low-numbered values and blocks.
	values [2000]Value
	blocks [200]Block
	locs   [2000]Location

	// Reusable stackAllocState.

		return nil, err
	}

	path := filepath.Join(cfg.GOMODCACHE, "cache", "lock")
	if err := os.MkdirAll(filepath.Dir(path), 0777); err != nil {
		return nil, fmt.Errorf("failed to create cache directory: %w", err)
	}

	return lockedfile.MutexAt(path).Lock()
}

// A cachingRepo is a cache around an underlying Repo,