mirror of https://github.com/status-im/evmc.git
91 lines
3.0 KiB
C
91 lines
3.0 KiB
C
/* EVMC: Ethereum Client-VM Connector API.
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* Copyright 2016-2019 The EVMC Authors.
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* Licensed under the Apache License, Version 2.0.
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*/
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#include "example_host.h"
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#ifdef STATICALLY_LINKED_EXAMPLE
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#include "example_vm/example_vm.h"
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#endif
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#include <evmc/helpers.h>
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#include <evmc/loader.h>
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#include <inttypes.h>
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#include <stdio.h>
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int main(int argc, char* argv[])
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{
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#ifdef STATICALLY_LINKED_EXAMPLE
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(void)argc;
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(void)argv;
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struct evmc_instance* vm = evmc_create_example_vm();
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if (!vm)
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return EVMC_LOADER_INSTANCE_CREATION_FAILURE;
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if (!evmc_is_abi_compatible(vm))
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return EVMC_LOADER_ABI_VERSION_MISMATCH;
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#else
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const char* config_string = (argc > 1) ? argv[1] : "example-vm.so";
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enum evmc_loader_error_code error_code;
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struct evmc_instance* vm = evmc_load_and_configure(config_string, &error_code);
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if (!vm)
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{
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printf("Loading error: %d\n", error_code);
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// NOTE: the values are small enough for casting
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return (int)error_code;
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}
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#endif
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// EVM bytecode goes here. This is one of the examples.
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const uint8_t code[] = "\x43\x60\x00\x55\x43\x60\x00\x52\x59\x60\x00\xf3";
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const size_t code_size = sizeof(code) - 1;
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const uint8_t input[] = "Hello World!";
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const evmc_uint256be value = {{1, 0}};
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const evmc_address addr = {{0, 1, 2}};
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const int64_t gas = 200000;
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struct evmc_tx_context tx_context;
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memset(&tx_context, 0, sizeof(tx_context));
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tx_context.block_number = 42;
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tx_context.block_timestamp = 66;
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tx_context.block_gas_limit = gas * 2;
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struct evmc_context* ctx = example_host_create_context(tx_context);
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struct evmc_message msg;
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msg.kind = EVMC_CALL;
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msg.sender = addr;
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msg.destination = addr;
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msg.value = value;
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msg.input_data = input;
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msg.input_size = sizeof(input);
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msg.gas = gas;
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msg.depth = 0;
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struct evmc_result result = evmc_execute(vm, ctx, EVMC_HOMESTEAD, &msg, code, code_size);
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printf("Execution result:\n");
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int exit_code = 0;
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if (result.status_code != EVMC_SUCCESS)
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{
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printf(" EVM execution failure: %d\n", result.status_code);
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exit_code = result.status_code;
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}
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else
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{
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printf(" Gas used: %" PRId64 "\n", gas - result.gas_left);
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printf(" Gas left: %" PRId64 "\n", result.gas_left);
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printf(" Output size: %zd\n", result.output_size);
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printf(" Output: ");
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size_t i = 0;
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for (i = 0; i < result.output_size; i++)
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printf("%02x", result.output_data[i]);
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printf("\n");
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const evmc_bytes32 storage_key = {{0}};
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evmc_bytes32 storage_value = ctx->host->get_storage(ctx, &msg.destination, &storage_key);
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printf(" Storage at 0x00..00: ");
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for (i = 0; i < sizeof(storage_value.bytes) / sizeof(storage_value.bytes[0]); i++)
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printf("%02x", storage_value.bytes[i]);
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printf("\n");
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}
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evmc_release_result(&result);
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example_host_destroy_context(ctx);
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evmc_destroy(vm);
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return exit_code;
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}
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