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examples: Refactor host example

This commit is contained in:
Paweł Bylica 2019-03-15 01:25:36 +01:00
parent e951ab251b
commit 83dae57ceb
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GPG Key ID: 7A0C037434FE77EF
2 changed files with 20 additions and 24 deletions
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40
examples/example_host.cpp
View File

@ -1,6 +1,7 @@
// EVMC -- Ethereum Client-VM Connector API
// Copyright 2018 The EVMC Authors.
// Licensed under the Apache License, Version 2.0. See the LICENSE file.
/* EVMC: Ethereum Client-VM Connector API.
* Copyright 2019 The EVMC Authors.
* Licensed under the Apache License, Version 2.0.
*/
/// @file
/// Example implementation of an EVMC Host.
@ -31,7 +32,7 @@ struct example_host_context : evmc_context
static bool account_exists(evmc_context* context, const evmc_address* address)
{
example_host_context* host = static_cast<example_host_context*>(context);
auto* host = static_cast<example_host_context*>(context);
return host->accounts.find(*address) != host->accounts.end();
}
@ -39,32 +40,29 @@ static evmc_bytes32 get_storage(evmc_context* context,
const evmc_address* address,
const evmc_bytes32* key)
{
example_host_context* host = static_cast<example_host_context*>(context);
auto* host = static_cast<example_host_context*>(context);
auto it = host->accounts.find(*address);
if (it != host->accounts.end())
return it->second.storage[*key];
return {};
}
static enum evmc_storage_status set_storage(evmc_context* context,
const evmc_address* address,
const evmc_bytes32* key,
const evmc_bytes32* value)
static evmc_storage_status set_storage(evmc_context* context,
const evmc_address* address,
const evmc_bytes32* key,
const evmc_bytes32* value)
{
example_host_context* host = static_cast<example_host_context*>(context);
auto* host = static_cast<example_host_context*>(context);
auto& account = host->accounts[*address];
auto prevValue = account.storage[*key];
auto prev_value = account.storage[*key];
account.storage[*key] = *value;
if (prevValue == *value)
return EVMC_STORAGE_UNCHANGED;
else
return EVMC_STORAGE_MODIFIED;
return (prev_value == *value) ? EVMC_STORAGE_UNCHANGED : EVMC_STORAGE_MODIFIED;
}
static evmc_uint256be get_balance(evmc_context* context, const evmc_address* address)
{
example_host_context* host = static_cast<example_host_context*>(context);
auto* host = static_cast<example_host_context*>(context);
auto it = host->accounts.find(*address);
if (it != host->accounts.end())
return it->second.balance;
@ -73,7 +71,7 @@ static evmc_uint256be get_balance(evmc_context* context, const evmc_address* add
static size_t get_code_size(evmc_context* context, const evmc_address* address)
{
example_host_context* host = static_cast<example_host_context*>(context);
auto* host = static_cast<example_host_context*>(context);
auto it = host->accounts.find(*address);
if (it != host->accounts.end())
return it->second.code_size;
@ -82,7 +80,7 @@ static size_t get_code_size(evmc_context* context, const evmc_address* address)
static evmc_bytes32 get_code_hash(evmc_context* context, const evmc_address* address)
{
example_host_context* host = static_cast<example_host_context*>(context);
auto* host = static_cast<example_host_context*>(context);
auto it = host->accounts.find(*address);
if (it != host->accounts.end())
return it->second.code_hash;
@ -130,14 +128,12 @@ static evmc_tx_context get_tx_context(evmc_context* context)
static evmc_bytes32 get_block_hash(evmc_context* context, int64_t number)
{
example_host_context* host = static_cast<example_host_context*>(context);
auto* host = static_cast<example_host_context*>(context);
int64_t current_block_number = host->tx_context.block_number;
evmc_bytes32 example_block_hash;
auto example_block_hash = evmc_bytes32{};
if (number < current_block_number && number >= current_block_number - 256)
example_block_hash = {{1, 1, 1, 1}};
else
example_block_hash = {};
return example_block_hash;
}

4
examples/example_host.h
View File

@ -1,6 +1,6 @@
/* EVMC: Ethereum Client-VM Connector API.
* Copyright 2018 The EVMC Authors.
* Licensed under the Apache License, Version 2.0. See the LICENSE file.
* Copyright 2019 The EVMC Authors.
* Licensed under the Apache License, Version 2.0.
*/
#include <evmc/evmc.h>