Add mock context for VM testing

test/vmtester/CMakeLists.txt

@@ -7,7 +7,7 @@ include(GNUInstallDirs)
 hunter_add_package(CLI11)
 find_package(CLI11)
 
-add_executable(evmc-vmtester vmtester.hpp vmtester.cpp tests.cpp)
+add_executable(evmc-vmtester vmtester.hpp vmtester.cpp tests.cpp mock_context.cpp)
 set_target_properties(evmc-vmtester PROPERTIES RUNTIME_OUTPUT_DIRECTORY ..)
 target_link_libraries(evmc-vmtester PRIVATE evmc loader GTest::gtest CLI11::CLI11)
 

test/vmtester/mock_context.cpp

@@ -0,0 +1,130 @@
+#include <evmc/evmc.h>
+#include <evmc/helpers.h>
+
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+evmc_uint256be balance(evmc_context* context, const evmc_address* address)
+{
+    (void)context;
+    (void)address;
+    evmc_uint256be ret = {{1, 2, 3, 4}};
+    return ret;
+}
+
+static int account_exists(evmc_context* context, const evmc_address* address)
+{
+    (void)context;
+    (void)address;
+    return 0;
+}
+
+static void get_storage(evmc_uint256be* result,
+                        evmc_context* context,
+                        const evmc_address* address,
+                        const evmc_uint256be* key)
+{
+    (void)result;
+    (void)context;
+    (void)address;
+    (void)key;
+}
+
+static enum evmc_storage_status set_storage(evmc_context* context,
+                                            const evmc_address* address,
+                                            const evmc_uint256be* key,
+                                            const evmc_uint256be* value)
+{
+    (void)context;
+    (void)address;
+    (void)key;
+    (void)value;
+    return EVMC_STORAGE_UNCHANGED;
+}
+
+static void get_balance(evmc_uint256be* result, evmc_context* context, const evmc_address* address)
+{
+    *result = balance(context, address);
+}
+
+static size_t get_code_size(evmc_context* context, const evmc_address* address)
+{
+    (void)context;
+    (void)address;
+    return 0;
+}
+
+static void get_code_hash(evmc_uint256be* result,
+                          evmc_context* context,
+                          const evmc_address* address)
+{
+    (void)result;
+    (void)context;
+    (void)address;
+}
+
+static size_t copy_code(evmc_context* context,
+                        const evmc_address* address,
+                        size_t code_offset,
+                        uint8_t* buffer_data,
+                        size_t buffer_size)
+{
+    (void)context;
+    (void)address;
+    (void)code_offset;
+    (void)buffer_data;
+    (void)buffer_size;
+    return 0;
+}
+
+static void selfdestruct(evmc_context* context,
+                         const evmc_address* address,
+                         const evmc_address* beneficiary)
+{
+    (void)context;
+    (void)address;
+    (void)beneficiary;
+}
+
+static void call(evmc_result* result, evmc_context* context, const evmc_message* msg)
+{
+    (void)context;
+    (void)msg;
+    result->status_code = EVMC_FAILURE;
+}
+
+static void get_tx_context(evmc_tx_context* result, evmc_context* context)
+{
+    (void)result;
+    (void)context;
+}
+
+static void get_block_hash(evmc_uint256be* result, evmc_context* context, int64_t number)
+{
+    (void)result;
+    (void)context;
+    (void)number;
+}
+
+/// EVM log callback.
+static void emit_log(evmc_context* context,
+                     const evmc_address* address,
+                     const uint8_t* data,
+                     size_t data_size,
+                     const evmc_uint256be topics[],
+                     size_t topics_count)
+{
+    (void)context;
+    (void)address;
+    (void)data;
+    (void)data_size;
+    (void)topics;
+    (void)topics_count;
+}
+
+extern const evmc_context_fn_table mock_context_fn_table = {
+    account_exists, get_storage,  set_storage, get_balance,    get_code_size,  get_code_hash,
+    copy_code,      selfdestruct, call,        get_tx_context, get_block_hash, emit_log,
+};

test/vmtester/tests.cpp

@@ -27,6 +27,8 @@ static constexpr size_t optionalDataSize =
     sizeof(evmc_result) - offsetof(evmc_result, create_address);
 static_assert(optionalDataSize == sizeof(evmc_result_optional_storage), "");
 
+extern const struct evmc_context_fn_table mock_context_fn_table;
+
 TEST_F(evmc_vm_test, abi_version_match)
 {
     ASSERT_EQ(vm->abi_version, EVMC_ABI_VERSION);
@@ -34,7 +36,7 @@ TEST_F(evmc_vm_test, abi_version_match)
 
 TEST_F(evmc_vm_test, execute)
 {
-    evmc_context context{};
+    evmc_context context = {&mock_context_fn_table};
     evmc_message msg{};
     std::array<uint8_t, 2> code = {{0xfe, 0x00}};