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feat(runtime-c-api) Add an API to update vm::Ctx.data.

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This patch adds 2 functions for the runtime C API, respectively
`wasmer_instance_context_data_set` and
`wasmer_instance_context_data_get`. The goal is to modify the
`vm::Ctx.data` field in the `runtime-core` library.

This is required to pass dynamic data to imported functions for
instance.
This commit is contained in:
Ivan Enderlin
2019-03-11 16:50:18 +01:00
parent a61fdf8b0b
commit a11d454130
3 changed files with 42 additions and 4 deletions
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20
lib/runtime-c-api/src/lib.rs
View File

@ -947,6 +947,17 @@ pub unsafe extern "C" fn wasmer_instance_exports(
*exports = Box::into_raw(named_exports) as *mut wasmer_exports_t;
}
/// Sets the `data` field of the instance context. This context will be
/// passed to all imported function for instance.
#[no_mangle]
pub extern "C" fn wasmer_instance_context_data_set(
instance: *mut wasmer_instance_t,
data_ptr: *mut c_void,
) {
let instance_ref = unsafe { &mut *(instance as *mut Instance) };
instance_ref.context_mut().data = data_ptr;
}
pub struct NamedExports(Vec<NamedExport>);
/// Frees the memory for the given exports
@ -1350,6 +1361,15 @@ pub extern "C" fn wasmer_instance_context_memory(
memory as *const Memory as *const wasmer_memory_t
}
/// Gets the `data` field within the context.
#[no_mangle]
pub extern "C" fn wasmer_instance_context_data_get(
ctx: *const wasmer_instance_context_t,
) -> *mut c_void {
let ctx = unsafe { &*(ctx as *const Ctx) };
ctx.data
}
/// Gets the start pointer to the bytes within a Memory
#[allow(clippy::cast_ptr_alignment)]
#[no_mangle]

15
lib/runtime-c-api/wasmer.h
View File

@ -95,11 +95,11 @@ typedef struct {
typedef struct {
} wasmer_memory_t;
} wasmer_instance_context_t;
typedef struct {
} wasmer_instance_context_t;
} wasmer_memory_t;
typedef struct {
@ -382,6 +382,17 @@ wasmer_result_t wasmer_instance_call(wasmer_instance_t *instance,
wasmer_value_t *results,
int results_len);
/**
* Gets the `data` field within the context.
*/
void *wasmer_instance_context_data_get(const wasmer_instance_context_t *ctx);
/**
* Sets the `data` field of the instance context. This context will be
* passed to all imported function for instance.
*/
void wasmer_instance_context_data_set(wasmer_instance_t *instance, void *data_ptr);
/**
* Gets the memory within the context at the index `memory_idx`.
* The index is always 0 until multiple memories are supported.

11
lib/runtime-c-api/wasmer.hh
View File

@ -90,11 +90,11 @@ struct wasmer_instance_t {
};
struct wasmer_memory_t {
struct wasmer_instance_context_t {
};
struct wasmer_instance_context_t {
struct wasmer_memory_t {
};
@ -307,6 +307,13 @@ wasmer_result_t wasmer_instance_call(wasmer_instance_t *instance,
wasmer_value_t *results,
int results_len);
/// Gets the `data` field within the context.
void *wasmer_instance_context_data_get(const wasmer_instance_context_t *ctx);
/// Sets the `data` field of the instance context. This context will be
/// passed to all imported function for instance.
void wasmer_instance_context_data_set(wasmer_instance_t *instance, void *data_ptr);
/// Gets the memory within the context at the index `memory_idx`.
/// The index is always 0 until multiple memories are supported.
const wasmer_memory_t *wasmer_instance_context_memory(const wasmer_instance_context_t *ctx,