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EVM-C: Attach result_release function to the result itself

This commit is contained in:
Paweł Bylica 2016-09-27 17:14:19 +02:00
parent 6f88571130
commit 8b9867c971
3 changed files with 25 additions and 18 deletions
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2
examples/capi.c
View File

@ -93,6 +93,6 @@ int main(int argc, char *argv[]) {
printf("\n");
}
intf.release_result(&result);
result.release(&result);
intf.destroy(jit);
}

10
examples/examplevm.c
View File

@ -40,6 +40,10 @@ int evm_set_option(struct evm_instance* evm,
return 0;
}
static void evm_release_result(struct evm_result const* result)
{
}
static struct evm_result evm_execute(struct evm_instance* instance,
struct evm_env* env,
enum evm_mode mode,
@ -57,16 +61,13 @@ static struct evm_result evm_execute(struct evm_instance* instance,
// Execute code and refer to callbacks: instance->query_fn()
ret.release = evm_release_result;
ret.code = EVM_FAILURE;
ret.gas_left = 0;
return ret;
}
static void evm_release_result(struct evm_result const* result)
{
}
struct evm_interface examplevm_get_interface()
{
struct evm_interface intf;
@ -75,7 +76,6 @@ struct evm_interface examplevm_get_interface()
intf.create = evm_create;
intf.destroy = evm_destroy;
intf.execute = evm_execute;
intf.release_result = evm_release_result;
intf.set_option = evm_set_option;
return intf;
}

31
include/evm.h
View File

@ -55,6 +55,18 @@ enum evm_result_code {
EVM_STACK_UNDERFLOW = 6,
};
struct evm_result;
/// Releases resources assigned to an execution result.
///
/// This function releases memory (and other resources, if any) assigned to the
/// specified execution result making the result object invalid.
///
/// @param result The execution result which resource are to be released. The
/// result itself it not modified by this function, but becomes
/// invalid and user should discard it as well.
typedef void (*evm_release_result_fn)(struct evm_result const* result);
/// The EVM code execution result.
struct evm_result {
/// The execution result code.
@ -83,6 +95,13 @@ struct evm_result {
/// The error message explaining the result code.
char const* error_message;
/// The pointer to the result release implementation.
///
/// This function pointer must be set by the VM implementation and works
/// similary to C++ virtual destructor. Attaching the releaser to the result
/// itself allows VM composition.
evm_release_result_fn release;
/// @}
};
@ -370,15 +389,6 @@ typedef struct evm_result (*evm_execute_fn)(struct evm_instance* instance,
size_t input_size,
struct evm_uint256be value);
/// Releases resources assigned to an execution result.
///
/// This function releases memory (and other resources, if any) assigned to the
/// specified execution result making the result object invalid.
///
/// @param result The execution result which resource are to be released. The
/// result itself it not modified by this function, but becomes
/// invalid and user should discard it as well.
typedef void (*evm_release_result_fn)(struct evm_result const* result);
/// Status of a code in VM. Useful for JIT-like implementations.
enum evm_code_status {
@ -427,9 +437,6 @@ struct evm_interface {
/// Pointer to function execuing a code in a VM.
evm_execute_fn execute;
/// Pointer to function releasing an execution result.
evm_release_result_fn release_result;
/// Optional pointer to function returning a status of a code.
///
/// If the VM does not support this feature the pointer can be NULL.