go: Expose transient storage API (#708)

Author: chfast

bindings/go/evmc/host.c

@@ -27,6 +27,8 @@ const struct evmc_host_interface evmc_go_host = {
     (evmc_emit_log_fn)emitLog,
     (evmc_access_account_fn)accessAccount,
     (evmc_access_storage_fn)accessStorage,
+    (evmc_get_transient_storage_fn)getTransientStorage,
+    (evmc_set_transient_storage_fn)setTransientStorage,
 };
 
 

bindings/go/evmc/host.go

@@ -103,6 +103,8 @@ type HostContext interface {
 		createAddr Address, err error)
 	AccessAccount(addr Address) AccessStatus
 	AccessStorage(addr Address, key Hash) AccessStatus
+	GetTransientStorage(addr Address, key Hash) Hash
+	SetTransientStorage(addr Address, key Hash, value Hash)
 }
 
 //export accountExists
@@ -247,3 +249,15 @@ func accessStorage(pCtx unsafe.Pointer, pAddr *C.evmc_address, pKey *C.evmc_byte
 	ctx := getHostContext(uintptr(pCtx))
 	return C.enum_evmc_access_status(ctx.AccessStorage(goAddress(*pAddr), goHash(*pKey)))
 }
+
+//export getTransientStorage
+func getTransientStorage(pCtx unsafe.Pointer, pAddr *C.struct_evmc_address, pKey *C.evmc_bytes32) C.evmc_bytes32 {
+	ctx := getHostContext(uintptr(pCtx))
+	return evmcBytes32(ctx.GetTransientStorage(goAddress(*pAddr), goHash(*pKey)))
+}
+
+//export setTransientStorage
+func setTransientStorage(pCtx unsafe.Pointer, pAddr *C.evmc_address, pKey *C.evmc_bytes32, pVal *C.evmc_bytes32) {
+	ctx := getHostContext(uintptr(pCtx))
+	ctx.SetTransientStorage(goAddress(*pAddr), goHash(*pKey), goHash(*pVal))
+}

bindings/go/evmc/host_test.go

@@ -72,6 +72,14 @@ func (host *testHostContext) AccessStorage(addr Address, key Hash) AccessStatus
 	return ColdAccess
 }
 
+func (host *testHostContext) GetTransientStorage(addr Address, key Hash) Hash {
+	return Hash{}
+}
+
+func (host *testHostContext) SetTransientStorage(addr Address, key Hash, value Hash) {
+}
+
+
 func TestGetBlockNumberFromTxContext(t *testing.T) {
 	// Yul: mstore(0, number()) return(0, msize())
 	code := []byte("\x43\x60\x00\x52\x59\x60\x00\xf3")