cpp: Add evmc::host - wrapper around Host context / interface
@@ -76,4 +76,92 @@ public:
private:
evmc_instance* const m_instance = nullptr;
};
+
+
+/// Wrapper around EVMC host context / host interface.
+class host
+{
+ evmc_context* context = nullptr;
+ evmc_tx_context tx_context = {};
+
+public:
+ host(evmc_context* context) noexcept : context{context} {}
+
+ bool account_exists(const evmc_address& address) noexcept
+ {
+ return context->host->account_exists(context, &address);
+ }
+
+ evmc_bytes32 get_storage(const evmc_address& address, const evmc_bytes32& key) noexcept
+ {
+ return context->host->get_storage(context, &address, &key);
+ }
+
+ evmc_storage_status set_storage(const evmc_address& address,
+ const evmc_bytes32& key,
+ const evmc_bytes32& value) noexcept
+ {
+ return context->host->set_storage(context, &address, &key, &value);
+ }
+
+ evmc_uint256be get_balance(const evmc_address& address) noexcept
+ {
+ return context->host->get_balance(context, &address);
+ }
+
+ size_t get_code_size(const evmc_address& address) noexcept
+ {
+ return context->host->get_code_size(context, &address);
+ }
+
+ evmc_bytes32 get_code_hash(const evmc_address& address) noexcept
+ {
+ return context->host->get_code_hash(context, &address);
+ }
+
+ size_t copy_code(const evmc_address& address,
+ size_t code_offset,
+ uint8_t* buffer_data,
+ size_t buffer_size) noexcept
+ {
+ return context->host->copy_code(context, &address, code_offset, buffer_data, buffer_size);
+ }
+
+ void selfdestruct(const evmc_address& address, const evmc_address& beneficiary)
+ {
+ context->host->selfdestruct(context, &address, &beneficiary);
+ }
+
+ result call(const evmc_message& message) noexcept
+ {
+ return result{context->host->call(context, &message)};
+ }
+
+ /// Gets the transaction and block context from the Host.
+ ///
+ /// The implementation caches the received transaction context
+ /// by assuming that the block timestamp should never be zero.
+ ///
+ /// @return Reference to the cached transaction context.
+ const evmc_tx_context& get_tx_context() noexcept
+ {
+ if (tx_context.block_timestamp == 0)
+ tx_context = context->host->get_tx_context(context);
+ return tx_context;
+ }
+
+ evmc_bytes32 get_block_hash(int64_t number) noexcept
+ {
+ return context->host->get_block_hash(context, number);
+ }
+
+ void emit_log(const evmc_address& address,
+ const uint8_t* data,
+ size_t data_size,
+ const evmc_bytes32 topics[],
+ size_t topics_count) noexcept
+ {
+ context->host->emit_log(context, &address, data, data_size, topics, topics_count);
+ }
+};
} // namespace evmc
