Merge pull request #102 from athenavm/refactor/export-host-interface-…

…from-go

ffi/athcon/bindings/go/athcon.go

@@ -202,9 +202,11 @@ func (vm *VM) Execute(
 	}
 
 	ctxHandle := cgo.NewHandle(ctx)
+
+	hostInterface := newHostInterface()
 	result := C.athcon_execute(
 		vm.handle,
-		&C.athcon_go_host,
+		hostInterface,
 		(*C.struct_athcon_host_context)(unsafe.Pointer(uintptr(ctxHandle))),
 		uint32(rev),
 		&msg,

ffi/athcon/bindings/go/host.go

@@ -5,6 +5,16 @@ package athcon
 
 #include <athcon/athcon.h>
 #include <athcon/helpers.h>
+#include <stdint.h>
+
+// Forward declarations of exported functions that are shared with the VM.
+bool accountExists(void *ctx, athcon_address *addr);
+athcon_bytes32 getStorage(void *ctx, athcon_address *addr, athcon_bytes32 *key);
+enum athcon_storage_status setStorage(void *ctx, athcon_address *addr, athcon_bytes32 *key, athcon_bytes32 *val);
+athcon_uint256be getBalance(void *ctx, athcon_address *addr);
+struct athcon_tx_context getTxContext(void *ctx);
+athcon_bytes32 getBlockHash(void *ctx, long long int number);
+struct athcon_result call(void *ctx, struct athcon_message *msg);
 */
 import "C"
 import (
@@ -84,7 +94,7 @@ func accountExists(pCtx unsafe.Pointer, pAddr *C.athcon_address) C.bool {
 }
 
 //export getStorage
-func getStorage(pCtx unsafe.Pointer, pAddr *C.struct_athcon_address, pKey *C.athcon_bytes32) C.athcon_bytes32 {
+func getStorage(pCtx unsafe.Pointer, pAddr *C.athcon_address, pKey *C.athcon_bytes32) C.athcon_bytes32 {
 	ctx := cgo.Handle(pCtx).Value().(HostContext)
 	return athconBytes32(ctx.GetStorage(goAddress(*pAddr), goHash(*pKey)))
 }
@@ -144,3 +154,15 @@ func call(pCtx unsafe.Pointer, msg *C.struct_athcon_message) C.struct_athcon_res
 	result.create_address = athconAddress(createAddr)
 	return result
 }
+
+func newHostInterface() *C.struct_athcon_host_interface {
+	return &C.struct_athcon_host_interface{
+		account_exists: (C.athcon_account_exists_fn)(C.accountExists),
+		get_storage:    (C.athcon_get_storage_fn)(C.getStorage),
+		set_storage:    (C.athcon_set_storage_fn)(C.setStorage),
+		get_balance:    (C.athcon_get_balance_fn)(C.getBalance),
+		get_tx_context: (C.athcon_get_tx_context_fn)(C.getTxContext),
+		get_block_hash: (C.athcon_get_block_hash_fn)(C.getBlockHash),
+		call:           (C.athcon_call_fn)(C.call),
+	}
+}