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examples: Fix and extend example VM with NUMBER example code

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This commit is contained in:
Paweł Bylica 2019-03-12 16:55:34 +01:00
parent 0a0bb0b92e
commit 1f1a095208
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GPG Key ID: 7A0C037434FE77EF
1 changed files with 21 additions and 2 deletions
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23
examples/example_vm.c
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@ -107,7 +107,10 @@ static struct evmc_result execute(struct evmc_instance* instance,
// Assembly: `{ sstore(0, add(sload(0), 1)) }`
const char counter[] = "\x60\x01\x60\x00\x54\x01\x60\x00\x55";
if (code_size == strlen(return_address) &&
// Assembly: `{ mstore(0, number()) return(0, msize()) }`
const char return_block_number[] = "\x43\x60\x00\x52\x59\x60\x00\xf3";
if (code_size == (sizeof(return_address) - 1) &&
strncmp((const char*)code, return_address, code_size) == 0)
{
static const size_t address_size = sizeof(msg->destination);
@ -125,7 +128,8 @@ static struct evmc_result execute(struct evmc_instance* instance,
ret.release = &free_result_output_data;
return ret;
}
else if (code_size == strlen(counter) && strncmp((const char*)code, counter, code_size) == 0)
else if (code_size == (sizeof(counter) - 1) &&
strncmp((const char*)code, counter, code_size) == 0)
{
const evmc_bytes32 key = {{0}};
evmc_bytes32 value = context->host->get_storage(context, &msg->destination, &key);
@ -134,6 +138,21 @@ static struct evmc_result execute(struct evmc_instance* instance,
ret.status_code = EVMC_SUCCESS;
return ret;
}
else if (code_size == (sizeof(return_block_number) - 1) &&
strncmp((const char*)code, return_block_number, code_size) == 0)
{
const struct evmc_tx_context tx_context = context->host->get_tx_context(context);
const size_t output_size = 20;
uint8_t* output_data = (uint8_t*)calloc(1, output_size);
snprintf((char*)output_data, output_size, "%u", (unsigned)tx_context.block_number);
ret.status_code = EVMC_SUCCESS;
ret.gas_left = msg->gas / 2;
ret.output_data = output_data;
ret.output_size = output_size;
ret.release = &free_result_output_data;
return ret;
}
ret.status_code = EVMC_FAILURE;
ret.gas_left = 0;