mirror of
https://github.com/ruby/ruby.git
synced 2022-11-09 12:17:21 -05:00
dffca50bb6
(https://github.com/ruby/fiddle/pull/109) These structs don't need to be freed as part of finalization, so lets free them immediately. https://github.com/ruby/fiddle/commit/8a10ec1152
433 lines
10 KiB
C
433 lines
10 KiB
C
#include <fiddle.h>
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#include <ruby/thread.h>
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int ruby_thread_has_gvl_p(void); /* from internal.h */
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VALUE cFiddleClosure;
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typedef struct {
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void * code;
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ffi_closure *pcl;
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ffi_cif cif;
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int argc;
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ffi_type **argv;
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} fiddle_closure;
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#if defined(__OpenBSD__)
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# define USE_FFI_CLOSURE_ALLOC 0
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#endif
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#if defined(USE_FFI_CLOSURE_ALLOC)
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#elif !defined(HAVE_FFI_CLOSURE_ALLOC)
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# define USE_FFI_CLOSURE_ALLOC 0
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#else
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# define USE_FFI_CLOSURE_ALLOC 1
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#endif
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static void
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dealloc(void * ptr)
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{
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fiddle_closure * cls = (fiddle_closure *)ptr;
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#if USE_FFI_CLOSURE_ALLOC
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ffi_closure_free(cls->pcl);
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#else
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munmap(cls->pcl, sizeof(*cls->pcl));
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#endif
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if (cls->argv) xfree(cls->argv);
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xfree(cls);
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}
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static size_t
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closure_memsize(const void * ptr)
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{
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fiddle_closure * cls = (fiddle_closure *)ptr;
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size_t size = 0;
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size += sizeof(*cls);
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#if !defined(FFI_NO_RAW_API) || !FFI_NO_RAW_API
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size += ffi_raw_size(&cls->cif);
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#endif
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size += sizeof(*cls->argv);
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size += sizeof(ffi_closure);
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return size;
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}
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const rb_data_type_t closure_data_type = {
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"fiddle/closure",
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{0, dealloc, closure_memsize,},
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0, 0,
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RUBY_TYPED_FREE_IMMEDIATELY,
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};
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struct callback_args {
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ffi_cif *cif;
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void *resp;
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void **args;
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void *ctx;
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};
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static void *
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with_gvl_callback(void *ptr)
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{
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struct callback_args *x = ptr;
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VALUE self = (VALUE)x->ctx;
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VALUE rbargs = rb_iv_get(self, "@args");
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VALUE ctype = rb_iv_get(self, "@ctype");
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int argc = RARRAY_LENINT(rbargs);
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VALUE params = rb_ary_tmp_new(argc);
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VALUE ret;
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VALUE cPointer;
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int i, type;
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cPointer = rb_const_get(mFiddle, rb_intern("Pointer"));
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for (i = 0; i < argc; i++) {
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type = NUM2INT(RARRAY_AREF(rbargs, i));
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switch (type) {
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case TYPE_VOID:
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argc = 0;
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break;
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case TYPE_INT:
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rb_ary_push(params, INT2NUM(*(int *)x->args[i]));
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break;
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case TYPE_UINT:
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rb_ary_push(params, UINT2NUM(*(unsigned int *)x->args[i]));
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break;
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case TYPE_VOIDP:
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rb_ary_push(params,
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rb_funcall(cPointer, rb_intern("[]"), 1,
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PTR2NUM(*(void **)x->args[i])));
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break;
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case TYPE_LONG:
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rb_ary_push(params, LONG2NUM(*(long *)x->args[i]));
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break;
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case TYPE_ULONG:
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rb_ary_push(params, ULONG2NUM(*(unsigned long *)x->args[i]));
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break;
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case TYPE_CHAR:
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rb_ary_push(params, INT2NUM(*(signed char *)x->args[i]));
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break;
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case TYPE_UCHAR:
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rb_ary_push(params, UINT2NUM(*(unsigned char *)x->args[i]));
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break;
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case TYPE_SHORT:
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rb_ary_push(params, INT2NUM(*(signed short *)x->args[i]));
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break;
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case TYPE_USHORT:
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rb_ary_push(params, UINT2NUM(*(unsigned short *)x->args[i]));
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break;
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case TYPE_DOUBLE:
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rb_ary_push(params, rb_float_new(*(double *)x->args[i]));
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break;
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case TYPE_FLOAT:
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rb_ary_push(params, rb_float_new(*(float *)x->args[i]));
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break;
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#if HAVE_LONG_LONG
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case TYPE_LONG_LONG:
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rb_ary_push(params, LL2NUM(*(LONG_LONG *)x->args[i]));
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break;
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case TYPE_ULONG_LONG:
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rb_ary_push(params, ULL2NUM(*(unsigned LONG_LONG *)x->args[i]));
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break;
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#endif
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case TYPE_CONST_STRING:
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rb_ary_push(params,
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rb_str_new_cstr(*((const char **)(x->args[i]))));
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break;
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default:
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rb_raise(rb_eRuntimeError, "closure args: %d", type);
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}
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}
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ret = rb_funcall2(self, rb_intern("call"), argc, RARRAY_CONST_PTR(params));
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RB_GC_GUARD(params);
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type = NUM2INT(ctype);
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switch (type) {
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case TYPE_VOID:
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break;
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case TYPE_LONG:
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*(long *)x->resp = NUM2LONG(ret);
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break;
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case TYPE_ULONG:
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*(unsigned long *)x->resp = NUM2ULONG(ret);
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break;
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case TYPE_CHAR:
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case TYPE_SHORT:
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case TYPE_INT:
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*(ffi_sarg *)x->resp = NUM2INT(ret);
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break;
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case TYPE_UCHAR:
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case TYPE_USHORT:
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case TYPE_UINT:
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*(ffi_arg *)x->resp = NUM2UINT(ret);
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break;
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case TYPE_VOIDP:
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*(void **)x->resp = NUM2PTR(ret);
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break;
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case TYPE_DOUBLE:
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*(double *)x->resp = NUM2DBL(ret);
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break;
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case TYPE_FLOAT:
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*(float *)x->resp = (float)NUM2DBL(ret);
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break;
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#if HAVE_LONG_LONG
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case TYPE_LONG_LONG:
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*(LONG_LONG *)x->resp = NUM2LL(ret);
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break;
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case TYPE_ULONG_LONG:
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*(unsigned LONG_LONG *)x->resp = NUM2ULL(ret);
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break;
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#endif
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case TYPE_CONST_STRING:
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/* Dangerous. Callback must keep reference of the String. */
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*((const char **)(x->resp)) = StringValueCStr(ret);
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break;
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default:
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rb_raise(rb_eRuntimeError, "closure retval: %d", type);
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}
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return 0;
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}
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static void
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callback(ffi_cif *cif, void *resp, void **args, void *ctx)
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{
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struct callback_args x;
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x.cif = cif;
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x.resp = resp;
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x.args = args;
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x.ctx = ctx;
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if (ruby_thread_has_gvl_p()) {
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(void)with_gvl_callback(&x);
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} else {
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(void)rb_thread_call_with_gvl(with_gvl_callback, &x);
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}
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}
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static VALUE
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allocate(VALUE klass)
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{
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fiddle_closure * closure;
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VALUE i = TypedData_Make_Struct(klass, fiddle_closure,
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&closure_data_type, closure);
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#if USE_FFI_CLOSURE_ALLOC
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closure->pcl = ffi_closure_alloc(sizeof(ffi_closure), &closure->code);
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#else
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closure->pcl = mmap(NULL, sizeof(ffi_closure), PROT_READ | PROT_WRITE,
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MAP_ANON | MAP_PRIVATE, -1, 0);
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#endif
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return i;
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}
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static fiddle_closure *
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get_raw(VALUE self)
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{
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fiddle_closure *closure;
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TypedData_Get_Struct(self, fiddle_closure, &closure_data_type, closure);
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if (!closure) {
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rb_raise(rb_eArgError, "already freed: %+"PRIsVALUE, self);
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}
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return closure;
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}
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typedef struct {
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VALUE self;
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int argc;
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VALUE *argv;
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} initialize_data;
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static VALUE
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initialize_body(VALUE user_data)
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{
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initialize_data *data = (initialize_data *)user_data;
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VALUE ret;
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VALUE args;
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VALUE normalized_args;
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VALUE abi;
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fiddle_closure * cl;
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ffi_cif * cif;
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ffi_closure *pcl;
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ffi_status result;
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int i, argc;
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if (2 == rb_scan_args(data->argc, data->argv, "21", &ret, &args, &abi))
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abi = INT2NUM(FFI_DEFAULT_ABI);
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Check_Type(args, T_ARRAY);
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argc = RARRAY_LENINT(args);
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TypedData_Get_Struct(data->self, fiddle_closure, &closure_data_type, cl);
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cl->argv = (ffi_type **)xcalloc(argc + 1, sizeof(ffi_type *));
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normalized_args = rb_ary_new_capa(argc);
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for (i = 0; i < argc; i++) {
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VALUE arg = rb_fiddle_type_ensure(RARRAY_AREF(args, i));
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rb_ary_push(normalized_args, arg);
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cl->argv[i] = rb_fiddle_int_to_ffi_type(NUM2INT(arg));
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}
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cl->argv[argc] = NULL;
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ret = rb_fiddle_type_ensure(ret);
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rb_iv_set(data->self, "@ctype", ret);
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rb_iv_set(data->self, "@args", normalized_args);
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cif = &cl->cif;
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pcl = cl->pcl;
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result = ffi_prep_cif(cif,
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NUM2INT(abi),
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argc,
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rb_fiddle_int_to_ffi_type(NUM2INT(ret)),
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cl->argv);
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if (FFI_OK != result) {
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rb_raise(rb_eRuntimeError, "error prepping CIF %d", result);
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}
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#if USE_FFI_CLOSURE_ALLOC
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result = ffi_prep_closure_loc(pcl, cif, callback,
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(void *)(data->self), cl->code);
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#else
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result = ffi_prep_closure(pcl, cif, callback, (void *)(data->self));
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cl->code = (void *)pcl;
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i = mprotect(pcl, sizeof(*pcl), PROT_READ | PROT_EXEC);
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if (i) {
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rb_sys_fail("mprotect");
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}
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#endif
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if (FFI_OK != result) {
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rb_raise(rb_eRuntimeError, "error prepping closure %d", result);
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}
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return data->self;
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}
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static VALUE
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initialize_rescue(VALUE user_data, VALUE exception)
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{
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initialize_data *data = (initialize_data *)user_data;
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dealloc(RTYPEDDATA_DATA(data->self));
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RTYPEDDATA_DATA(data->self) = NULL;
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rb_exc_raise(exception);
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return data->self;
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}
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static VALUE
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initialize(int argc, VALUE *argv, VALUE self)
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{
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initialize_data data;
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data.self = self;
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data.argc = argc;
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data.argv = argv;
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return rb_rescue(initialize_body, (VALUE)&data,
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initialize_rescue, (VALUE)&data);
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}
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static VALUE
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to_i(VALUE self)
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{
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fiddle_closure *closure = get_raw(self);
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return PTR2NUM(closure->code);
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}
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static VALUE
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closure_free(VALUE self)
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{
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fiddle_closure *closure;
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TypedData_Get_Struct(self, fiddle_closure, &closure_data_type, closure);
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if (closure) {
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dealloc(closure);
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RTYPEDDATA_DATA(self) = NULL;
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}
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return RUBY_Qnil;
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}
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static VALUE
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closure_freed_p(VALUE self)
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{
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fiddle_closure *closure;
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TypedData_Get_Struct(self, fiddle_closure, &closure_data_type, closure);
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return closure ? RUBY_Qfalse : RUBY_Qtrue;
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}
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void
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Init_fiddle_closure(void)
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{
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#if 0
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mFiddle = rb_define_module("Fiddle"); /* let rdoc know about mFiddle */
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#endif
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/*
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* Document-class: Fiddle::Closure
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*
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* == Description
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*
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* An FFI closure wrapper, for handling callbacks.
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*
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* == Example
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*
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* closure = Class.new(Fiddle::Closure) {
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* def call
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* 10
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* end
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* }.new(Fiddle::TYPE_INT, [])
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* #=> #<#<Class:0x0000000150d308>:0x0000000150d240>
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* func = Fiddle::Function.new(closure, [], Fiddle::TYPE_INT)
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* #=> #<Fiddle::Function:0x00000001516e58>
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* func.call
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* #=> 10
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*/
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cFiddleClosure = rb_define_class_under(mFiddle, "Closure", rb_cObject);
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rb_define_alloc_func(cFiddleClosure, allocate);
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/*
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* Document-method: new
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*
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* call-seq: new(ret, args, abi = Fiddle::DEFAULT)
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*
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* Construct a new Closure object.
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*
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* * +ret+ is the C type to be returned
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* * +args+ is an Array of arguments, passed to the callback function
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* * +abi+ is the abi of the closure
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*
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* If there is an error in preparing the ffi_cif or ffi_prep_closure,
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* then a RuntimeError will be raised.
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*/
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rb_define_method(cFiddleClosure, "initialize", initialize, -1);
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/*
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* Document-method: to_i
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*
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* Returns the memory address for this closure.
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*/
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rb_define_method(cFiddleClosure, "to_i", to_i, 0);
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/*
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* Document-method: free
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*
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* Free this closure explicitly. You can't use this closure anymore.
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*
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* If this closure is already freed, this does nothing.
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*/
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rb_define_method(cFiddleClosure, "free", closure_free, 0);
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/*
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* Document-method: freed?
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*
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* Whether this closure was freed explicitly.
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*/
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rb_define_method(cFiddleClosure, "freed?", closure_freed_p, 0);
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}
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/* vim: set noet sw=4 sts=4 */
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