Add PUSH0 instruction implementation

Author: chfast

lib/evmone/instructions.hpp

@@ -781,6 +781,11 @@ inline void gas(StackTop stack, ExecutionState& state) noexcept
     stack.push(state.gas_left);
 }
 
+inline void push0(StackTop stack) noexcept
+{
+    stack.push({});
+}
+
 
 template <size_t Len>
 inline uint64_t load_partial_push_data(code_iterator pos) noexcept

lib/evmone/instructions_xmacro.hpp

@@ -68,6 +68,7 @@
     X(OP_MSIZE, msize)                   \
     X(OP_GAS, gas)                       \
     X(OP_JUMPDEST, jumpdest)             \
+    X(OP_PUSH0, push0)                   \
     X(OP_PUSH1, push<1>)                 \
     X(OP_PUSH2, push<2>)                 \
     X(OP_PUSH3, push<3>)                 \

test/unittests/CMakeLists.txt

@@ -15,6 +15,7 @@ add_executable(evmone-unittests
     evm_calls_test.cpp
     evm_eip2929_test.cpp
     evm_eip3198_basefee_test.cpp
+    evm_eip3855_push0_test.cpp
     evm_memory_test.cpp
     evm_state_test.cpp
     evm_other_test.cpp

test/unittests/evm_eip3855_push0_test.cpp

@@ -0,0 +1,50 @@
+// evmone: Fast Ethereum Virtual Machine implementation
+// Copyright 2022 The evmone Authors.
+// SPDX-License-Identifier: Apache-2.0
+
+/// This file contains EVM unit tests for EIP-3855 "PUSH0 instruction"
+/// https://eips.ethereum.org/EIPS/eip-3855
+
+#include "evm_fixture.hpp"
+
+using namespace evmc::literals;
+using evmone::test::evm;
+
+TEST_P(evm, push0_pre_shanghai)
+{
+    rev = EVMC_PARIS;
+    const auto code = bytecode{OP_PUSH0};
+
+    execute(code);
+    EXPECT_STATUS(EVMC_UNDEFINED_INSTRUCTION);
+}
+
+TEST_P(evm, push0)
+{
+    rev = EVMC_SHANGHAI;
+    execute(OP_PUSH0 + ret_top());
+    EXPECT_GAS_USED(EVMC_SUCCESS, 17);
+    EXPECT_OUTPUT_INT(0);
+}
+
+TEST_P(evm, push0_return_empty)
+{
+    rev = EVMC_SHANGHAI;
+    execute(bytecode{} + OP_PUSH0 + OP_PUSH0 + OP_RETURN);
+    EXPECT_GAS_USED(EVMC_SUCCESS, 4);
+    EXPECT_EQ(result.output_size, 0);
+}
+
+TEST_P(evm, push0_full_stack)
+{
+    rev = EVMC_SHANGHAI;
+    execute(1024 * bytecode{OP_PUSH0});
+    EXPECT_GAS_USED(EVMC_SUCCESS, 1024 * 2);
+}
+
+TEST_P(evm, push0_stack_overflow)
+{
+    rev = EVMC_SHANGHAI;
+    execute(1025 * bytecode{OP_PUSH0});
+    EXPECT_STATUS(EVMC_STACK_OVERFLOW);
+}