op-bindings: fix canonicalize impl

op-bindings/Makefile

@@ -21,7 +21,8 @@ bindings-build:
 		-out ./bindings \
 		-contracts ./artifacts.json \
 		-source-maps MIPS,PreimageOracle \
-		-package $(pkg)
+		-package $(pkg) \
+		-monorepo-base $(shell dirname $(realpath .))
 
 mkdir:
 	mkdir -p $(pkg)

op-bindings/ast/canonicalize.go

@@ -7,8 +7,6 @@ import (
 	"strconv"
 	"strings"
 
-	"golang.org/x/exp/slices"
-
 	"github.com/ethereum-optimism/optimism/op-bindings/solc"
 )
 
@@ -36,7 +34,7 @@ type typeRemapping struct {
 // inefficiency comes from replaceType, which performs a linear
 // search of all replacements when performing substring matches of
 // composite types.
-func CanonicalizeASTIDs(in *solc.StorageLayout) *solc.StorageLayout {
+func CanonicalizeASTIDs(in *solc.StorageLayout, monorepoBase string) *solc.StorageLayout {
 	lastId := uint(1000)
 	astIDRemappings := make(map[uint]uint)
 	typeRemappings := make(map[string]string)
@@ -92,10 +90,7 @@ func CanonicalizeASTIDs(in *solc.StorageLayout) *solc.StorageLayout {
 		// are used when there are 2 contracts imported with the same
 		// name
 		if filepath.IsAbs(contract) {
-			elements := strings.Split(contract, "/")
-			if idx := slices.Index(elements, "optimism"); idx != -1 {
-				contract = filepath.Join(elements[idx+1:]...)
-			}
+			contract = strings.TrimPrefix(strings.Replace(contract, monorepoBase, "", 1), "/")
 		}
 
 		outLayout.Storage = append(outLayout.Storage, solc.StorageLayoutEntry{

op-bindings/ast/canonicalize_test.go

@@ -49,7 +49,7 @@ func TestCanonicalize(t *testing.T) {
 			// Run 100 times to make sure that we aren't relying
 			// on random map iteration order.
 			for i := 0; i < 100; i++ {
-				require.Equal(t, testData.Out, CanonicalizeASTIDs(testData.In))
+				require.Equal(t, testData.Out, CanonicalizeASTIDs(testData.In, ""))
 			}
 		})
 	}

op-bindings/gen/main.go

@@ -22,6 +22,7 @@ type flags struct {
 	SourceMaps     string
 	OutDir         string
 	Package        string
+	MonorepoBase   string
 }
 
 type data struct {
@@ -39,8 +40,14 @@ func main() {
 	flag.StringVar(&f.Contracts, "contracts", "artifacts.json", "Path to file containing list of contracts to generate bindings for")
 	flag.StringVar(&f.SourceMaps, "source-maps", "", "Comma-separated list of contracts to generate source-maps for")
 	flag.StringVar(&f.Package, "package", "artifacts", "Go package name")
+	flag.StringVar(&f.MonorepoBase, "monorepo-base", "", "Base of the monorepo")
 	flag.Parse()
 
+	if f.MonorepoBase == "" {
+		log.Fatal("must provide -monorepo-base")
+	}
+	log.Printf("Using monorepo base %s\n", f.MonorepoBase)
+
 	contractData, err := os.ReadFile(f.Contracts)
 	if err != nil {
 		log.Fatal("error reading contract list: %w\n", err)
@@ -147,7 +154,7 @@ func main() {
 		}
 
 		storage := artifact.StorageLayout
-		canonicalStorage := ast.CanonicalizeASTIDs(&storage)
+		canonicalStorage := ast.CanonicalizeASTIDs(&storage, f.MonorepoBase)
 		ser, err := json.Marshal(canonicalStorage)
 		if err != nil {
 			log.Fatalf("error marshaling storage: %v\n", err)