File wavm/dynlink.cpp

Defines

FFI_TYPE_CASE(nativeType)

namespace wasm

SYSCALL NUMBERING

Have a look in the sysroot at include/bits/syscall.h to determine the system call numbering.

Enums

enum libffi_type_value

Values:

enumerator VOID

enumerator INT

enumerator FLOAT

enumerator DOUBLE

enumerator LONGDOUBLE

enumerator UINT8

enumerator SINT8

enumerator UINT16

enumerator SINT16

enumerator UINT32

enumerator SINT32

enumerator UINT64

enumerator SINT64

enumerator STRUCT

enumerator POINTER

enumerator COMPLEX

Functions

void dynlinkLink()

WAVM_DEFINE_INTRINSIC_FUNCTION (env, "dlopen", I32, dlopen, I32 fileNamePtr, I32 flags)

WebAssembly official docs on dynamic linking: https://webassembly.org/docs/dynamic-linking/

Tool conventions: https://github.com/WebAssembly/tool-conventions/blob/main/DynamicLinking.md

WAVM_DEFINE_INTRINSIC_FUNCTION (env, "dlsym", I32, dlsym, I32 handle, I32 symbolPtr)

WAVM_DEFINE_INTRINSIC_FUNCTION (env, "dlerror", I32, dlerror)

WAVM_DEFINE_INTRINSIC_FUNCTION (env, "dlclose", I32, dlclose, I32 handle)

WAVM_DEFINE_INTRINSIC_FUNCTION (env, "ffi_call", void, ffi_call, I32 cifPtr, I32 fnPtr, I32 retPtr, I32 argsPtrPtr)

The implementation of ffi_call is language-specific. The signature is:

void ffi_call(ffi_cif *cif, void (*fn)(void), void *ret, void **args);

• cif = function definition

• fn = function pointer

• ret = return value address

• args = arguments

WAVM_DEFINE_INTRINSIC_FUNCTION (env, "ffi_prep_closure_loc", I32, ffi_prep_closure_loc, I32 a, I32 b, I32 c, I32 d, I32 e)

struct libffi_cif

Public Members

uint32_t abi

uint32_t nargs

uint32_t argTypesPtrPtr

uint32_t retTypePtr

uint32_t bytes

uint32_t flags

struct libffi_type

Public Members

uint32_t size

uint16_t alignment

uint16_t type

uint32_t elementsPtrPtr