fix abi methods crash on wasm

internal/build/build.go

@@ -691,7 +691,7 @@ func buildLdflags(goos, goarch, targetTriple string) []string {
 			"-lwasi-emulated-signal",
 			"-fwasm-exceptions",
 			"-mllvm", "-wasm-enable-sjlj",
-			"-mllvm", "-wasm-enable-eh",
+			// "-mllvm", "-wasm-enable-eh", // unreachable error if enabled
 			// "-mllvm", "-wasm-disable-explicit-locals", // WASM module load failed: type mismatch: expect data but stack was empty if enabled
 		)
 		if IsWasiThreadsEnabled() {

runtime/abi/type.go

@@ -342,14 +342,28 @@ func (t *UncommonType) Methods() []Method {
 	if t.Mcount == 0 {
 		return nil
 	}
-	return (*[1 << 16]Method)(addChecked(unsafe.Pointer(t), uintptr(t.Moff), "t.mcount > 0"))[:t.Mcount:t.Mcount]
+	methodsPtr := addChecked(unsafe.Pointer(t), uintptr(t.Moff), "t.mcount > 0")
+	methods := make([]Method, t.Mcount)
+	for i := 0; i < int(t.Mcount); i++ {
+		elemPtr := addChecked(methodsPtr, uintptr(i)*unsafe.Sizeof(Method{}), "accessing method element")
+		elem := (*Method)(elemPtr)
+		methods[i] = *elem
+	}
+	return methods
 }
 
 func (t *UncommonType) ExportedMethods() []Method {
 	if t.Xcount == 0 {
 		return nil
 	}
-	return (*[1 << 16]Method)(addChecked(unsafe.Pointer(t), uintptr(t.Moff), "t.xcount > 0"))[:t.Xcount:t.Xcount]
+	mthdsPtr := addChecked(unsafe.Pointer(t), uintptr(t.Moff), "t.xcount > 0")
+	mthds := make([]Method, t.Xcount)
+	for i := 0; i < int(t.Xcount); i++ {
+		elemPtr := addChecked(mthdsPtr, uintptr(i)*unsafe.Sizeof(Method{}), "accessing method element")
+		elem := (*Method)(elemPtr)
+		mthds[i] = *elem
+	}
+	return mthds
 }
 
 // Imethod represents a method on an interface type