2019-07-08 14:04:52 +00:00
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/* EVMC: Ethereum Client-VM Connector API.
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* Copyright 2018-2019 The EVMC Authors.
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* Licensed under the Apache License, Version 2.0.
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*/
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/**
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* EVMC Helpers
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*
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* A collection of C helper functions for invoking a VM instance methods.
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* These are convenient for languages where invoking function pointers
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* is "ugly" or impossible (such as Go).
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*
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* It also contains helpers (overloaded operators) for using EVMC types effectively in C++.
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*
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* @defgroup helpers EVMC Helpers
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* @{
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*/
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#pragma once
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#include <evmc/evmc.h>
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2019-11-07 10:34:12 +00:00
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#include <stdlib.h>
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#include <string.h>
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2019-07-08 14:04:52 +00:00
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/**
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* Returns true if the VM instance has a compatible ABI version.
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*/
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static inline int evmc_is_abi_compatible(struct evmc_instance* instance)
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{
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return instance->abi_version == EVMC_ABI_VERSION;
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}
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/**
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* Returns the name of the VM instance.
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*/
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static inline const char* evmc_vm_name(struct evmc_instance* instance)
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{
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return instance->name;
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}
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/**
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* Returns the version of the VM instance.
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*/
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static inline const char* evmc_vm_version(struct evmc_instance* instance)
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{
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return instance->version;
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}
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/**
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* Checks if the VM instance has the given capability.
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*
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* @see evmc_get_capabilities_fn
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*/
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static inline bool evmc_vm_has_capability(struct evmc_instance* vm,
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enum evmc_capabilities capability)
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{
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return (vm->get_capabilities(vm) & (evmc_capabilities_flagset)capability) != 0;
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}
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/**
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* Destroys the VM instance.
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*
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* @see evmc_destroy_fn
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*/
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static inline void evmc_destroy(struct evmc_instance* instance)
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{
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instance->destroy(instance);
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}
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/**
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* Sets the option for the VM instance, if the feature is supported by the VM.
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*
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* @see evmc_set_option_fn
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*/
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static inline enum evmc_set_option_result evmc_set_option(struct evmc_instance* instance,
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char const* name,
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char const* value)
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{
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if (instance->set_option)
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return instance->set_option(instance, name, value);
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return EVMC_SET_OPTION_INVALID_NAME;
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}
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/**
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* Sets the tracer callback for the VM instance, if the feature is supported by the VM.
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*
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* @see evmc_set_tracer_fn
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*/
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2019-11-07 10:34:12 +00:00
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EVMC_DEPRECATED
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2019-07-08 14:04:52 +00:00
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static inline void evmc_set_tracer(struct evmc_instance* instance,
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evmc_trace_callback callback,
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struct evmc_tracer_context* context)
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{
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if (instance->set_tracer)
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instance->set_tracer(instance, callback, context);
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}
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/**
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* Executes code in the VM instance.
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*
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* @see evmc_execute_fn.
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*/
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static inline struct evmc_result evmc_execute(struct evmc_instance* instance,
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struct evmc_context* context,
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enum evmc_revision rev,
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const struct evmc_message* msg,
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uint8_t const* code,
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size_t code_size)
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{
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return instance->execute(instance, context, rev, msg, code, code_size);
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}
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2019-11-07 10:34:12 +00:00
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/// The evmc_result release function using free() for releasing the memory.
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///
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/// This function is used in the evmc_make_result(),
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/// but may be also used in other case if convenient.
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///
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/// @param result The result object.
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static void evmc_free_result_memory(const struct evmc_result* result)
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{
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free((uint8_t*)result->output_data);
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}
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/// Creates the result from the provided arguments.
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///
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/// The provided output is copied to memory allocated with malloc()
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/// and the evmc_result::release function is set to one invoking free().
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///
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/// In case of memory allocation failure, the result has all fields zeroed
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/// and only evmc_result::status_code is set to ::EVMC_OUT_OF_MEMORY internal error.
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///
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/// @param status_code The status code.
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/// @param gas_left The amount of gas left.
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/// @param output_data The pointer to the output.
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/// @param output_size The output size.
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static inline struct evmc_result evmc_make_result(enum evmc_status_code status_code,
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int64_t gas_left,
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const uint8_t* output_data,
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size_t output_size)
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{
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struct evmc_result result;
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memset(&result, 0, sizeof(result));
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if (output_size != 0)
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{
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uint8_t* buffer = (uint8_t*)malloc(output_size);
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if (!buffer)
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{
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result.status_code = EVMC_OUT_OF_MEMORY;
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return result;
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}
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memcpy(buffer, output_data, output_size);
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result.output_data = buffer;
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result.output_size = output_size;
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result.release = evmc_free_result_memory;
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}
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result.status_code = status_code;
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result.gas_left = gas_left;
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return result;
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}
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2019-07-08 14:04:52 +00:00
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/**
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* Releases the resources allocated to the execution result.
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*
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* @param result The result object to be released. MUST NOT be NULL.
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*
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* @see evmc_result::release() evmc_release_result_fn
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*/
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static inline void evmc_release_result(struct evmc_result* result)
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{
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if (result->release)
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result->release(result);
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}
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/**
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* Helpers for optional storage of evmc_result.
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*
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* In some contexts (i.e. evmc_result::create_address is unused) objects of
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* type evmc_result contains a memory storage that MAY be used by the object
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* owner. This group defines helper types and functions for accessing
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* the optional storage.
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*
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* @defgroup result_optional_storage Result Optional Storage
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* @{
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*/
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/**
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* The union representing evmc_result "optional storage".
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*
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* The evmc_result struct contains 24 bytes of optional storage that can be
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* reused by the object creator if the object does not contain
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* evmc_result::create_address.
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*
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* A VM implementation MAY use this memory to keep additional data
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* when returning result from evmc_execute_fn().
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* The host application MAY use this memory to keep additional data
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* when returning result of performed calls from evmc_call_fn().
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*
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* @see evmc_get_optional_storage(), evmc_get_const_optional_storage().
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*/
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union evmc_result_optional_storage
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{
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uint8_t bytes[24]; /**< 24 bytes of optional storage. */
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void* pointer; /**< Optional pointer. */
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};
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/** Provides read-write access to evmc_result "optional storage". */
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static inline union evmc_result_optional_storage* evmc_get_optional_storage(
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struct evmc_result* result)
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{
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return (union evmc_result_optional_storage*)&result->create_address;
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}
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/** Provides read-only access to evmc_result "optional storage". */
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static inline const union evmc_result_optional_storage* evmc_get_const_optional_storage(
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const struct evmc_result* result)
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{
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return (const union evmc_result_optional_storage*)&result->create_address;
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}
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/** @} */
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/** @} */
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