Initial checkin

BeefySysLib/third_party/libffi/osx/src/prep_cif.c

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+/* -----------------------------------------------------------------------
+   prep_cif.c - Copyright (c) 2011, 2012  Anthony Green
+                Copyright (c) 1996, 1998, 2007  Red Hat, Inc.
+
+   Permission is hereby granted, free of charge, to any person obtaining
+   a copy of this software and associated documentation files (the
+   ``Software''), to deal in the Software without restriction, including
+   without limitation the rights to use, copy, modify, merge, publish,
+   distribute, sublicense, and/or sell copies of the Software, and to
+   permit persons to whom the Software is furnished to do so, subject to
+   the following conditions:
+
+   The above copyright notice and this permission notice shall be included
+   in all copies or substantial portions of the Software.
+
+   THE SOFTWARE IS PROVIDED ``AS IS'', WITHOUT WARRANTY OF ANY KIND,
+   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+   MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+   NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+   DEALINGS IN THE SOFTWARE.
+   ----------------------------------------------------------------------- */
+
+#include <ffi.h>
+#include <ffi_common.h>
+#include <stdlib.h>
+
+/* Round up to FFI_SIZEOF_ARG. */
+
+#define STACK_ARG_SIZE(x) ALIGN(x, FFI_SIZEOF_ARG)
+
+/* Perform machine independent initialization of aggregate type
+   specifications. */
+
+static ffi_status initialize_aggregate(ffi_type *arg)
+{
+  ffi_type **ptr;
+
+  if (UNLIKELY(arg == NULL || arg->elements == NULL))
+    return FFI_BAD_TYPEDEF;
+
+  arg->size = 0;
+  arg->alignment = 0;
+
+  ptr = &(arg->elements[0]);
+
+  if (UNLIKELY(ptr == 0))
+    return FFI_BAD_TYPEDEF;
+
+  while ((*ptr) != NULL)
+    {
+      if (UNLIKELY(((*ptr)->size == 0)
+		    && (initialize_aggregate((*ptr)) != FFI_OK)))
+	return FFI_BAD_TYPEDEF;
+
+      /* Perform a sanity check on the argument type */
+      FFI_ASSERT_VALID_TYPE(*ptr);
+
+      arg->size = ALIGN(arg->size, (*ptr)->alignment);
+      arg->size += (*ptr)->size;
+
+      arg->alignment = (arg->alignment > (*ptr)->alignment) ?
+	arg->alignment : (*ptr)->alignment;
+
+      ptr++;
+    }
+
+  /* Structure size includes tail padding.  This is important for
+     structures that fit in one register on ABIs like the PowerPC64
+     Linux ABI that right justify small structs in a register.
+     It's also needed for nested structure layout, for example
+     struct A { long a; char b; }; struct B { struct A x; char y; };
+     should find y at an offset of 2*sizeof(long) and result in a
+     total size of 3*sizeof(long).  */
+  arg->size = ALIGN (arg->size, arg->alignment);
+
+  if (arg->size == 0)
+    return FFI_BAD_TYPEDEF;
+  else
+    return FFI_OK;
+}
+
+#ifndef __CRIS__
+/* The CRIS ABI specifies structure elements to have byte
+   alignment only, so it completely overrides this functions,
+   which assumes "natural" alignment and padding.  */
+
+/* Perform machine independent ffi_cif preparation, then call
+   machine dependent routine. */
+
+/* For non variadic functions isvariadic should be 0 and
+   nfixedargs==ntotalargs.
+
+   For variadic calls, isvariadic should be 1 and nfixedargs
+   and ntotalargs set as appropriate. nfixedargs must always be >=1 */
+
+
+ffi_status FFI_HIDDEN ffi_prep_cif_core(ffi_cif *cif, ffi_abi abi,
+			     unsigned int isvariadic,
+                             unsigned int nfixedargs,
+                             unsigned int ntotalargs,
+			     ffi_type *rtype, ffi_type **atypes)
+{
+  unsigned bytes = 0;
+  unsigned int i;
+  ffi_type **ptr;
+
+  FFI_ASSERT(cif != NULL);
+  FFI_ASSERT((!isvariadic) || (nfixedargs >= 1));
+  FFI_ASSERT(nfixedargs <= ntotalargs);
+
+#ifndef X86_WIN32
+  if (! (abi > FFI_FIRST_ABI && abi < FFI_LAST_ABI))
+    return FFI_BAD_ABI;
+#else
+  if (! (abi > FFI_FIRST_ABI && abi < FFI_LAST_ABI || abi == FFI_THISCALL))
+    return FFI_BAD_ABI;
+#endif
+
+  cif->abi = abi;
+  cif->arg_types = atypes;
+  cif->nargs = ntotalargs;
+  cif->rtype = rtype;
+
+  cif->flags = 0;
+
+  /* Initialize the return type if necessary */
+  if ((cif->rtype->size == 0) && (initialize_aggregate(cif->rtype) != FFI_OK))
+    return FFI_BAD_TYPEDEF;
+
+  /* Perform a sanity check on the return type */
+  FFI_ASSERT_VALID_TYPE(cif->rtype);
+
+  /* x86, x86-64 and s390 stack space allocation is handled in prep_machdep. */
+#if !defined M68K && !defined X86_ANY && !defined S390 && !defined PA
+  /* Make space for the return structure pointer */
+  if (cif->rtype->type == FFI_TYPE_STRUCT
+#ifdef SPARC
+      && (cif->abi != FFI_V9 || cif->rtype->size > 32)
+#endif
+#ifdef TILE
+      && (cif->rtype->size > 10 * FFI_SIZEOF_ARG)
+#endif
+#ifdef XTENSA
+      && (cif->rtype->size > 16)
+#endif
+
+     )
+    bytes = STACK_ARG_SIZE(sizeof(void*));
+#endif
+
+  for (ptr = cif->arg_types, i = cif->nargs; i > 0; i--, ptr++)
+    {
+
+      /* Initialize any uninitialized aggregate type definitions */
+      if (((*ptr)->size == 0) && (initialize_aggregate((*ptr)) != FFI_OK))
+	return FFI_BAD_TYPEDEF;
+
+      /* Perform a sanity check on the argument type, do this
+	 check after the initialization.  */
+      FFI_ASSERT_VALID_TYPE(*ptr);
+
+#if !defined X86_ANY && !defined S390 && !defined PA
+#ifdef SPARC
+      if (((*ptr)->type == FFI_TYPE_STRUCT
+	   && ((*ptr)->size > 16 || cif->abi != FFI_V9))
+	  || ((*ptr)->type == FFI_TYPE_LONGDOUBLE
+	      && cif->abi != FFI_V9))
+	bytes += sizeof(void*);
+      else
+#endif
+	{
+	  /* Add any padding if necessary */
+	  if (((*ptr)->alignment - 1) & bytes)
+	    bytes = ALIGN(bytes, (*ptr)->alignment);
+
+#ifdef TILE
+	  if (bytes < 10 * FFI_SIZEOF_ARG &&
+	      bytes + STACK_ARG_SIZE((*ptr)->size) > 10 * FFI_SIZEOF_ARG)
+	    {
+	      /* An argument is never split between the 10 parameter
+		 registers and the stack.  */
+	      bytes = 10 * FFI_SIZEOF_ARG;
+	    }
+#endif
+#ifdef XTENSA
+	  if (bytes <= 6*4 && bytes + STACK_ARG_SIZE((*ptr)->size) > 6*4)
+	    bytes = 6*4;
+#endif
+
+	  bytes += STACK_ARG_SIZE((*ptr)->size);
+	}
+#endif
+    }
+
+  cif->bytes = bytes;
+
+  /* Perform machine dependent cif processing */
+#ifdef FFI_TARGET_SPECIFIC_VARIADIC
+  if (isvariadic)
+	return ffi_prep_cif_machdep_var(cif, nfixedargs, ntotalargs);
+#endif
+
+  return ffi_prep_cif_machdep(cif);
+}
+#endif /* not __CRIS__ */
+
+ffi_status ffi_prep_cif(ffi_cif *cif, ffi_abi abi, unsigned int nargs,
+			     ffi_type *rtype, ffi_type **atypes)
+{
+  return ffi_prep_cif_core(cif, abi, 0, nargs, nargs, rtype, atypes);
+}
+
+ffi_status ffi_prep_cif_var(ffi_cif *cif,
+                            ffi_abi abi,
+                            unsigned int nfixedargs,
+                            unsigned int ntotalargs,
+                            ffi_type *rtype,
+                            ffi_type **atypes)
+{
+  return ffi_prep_cif_core(cif, abi, 1, nfixedargs, ntotalargs, rtype, atypes);
+}
+
+#if FFI_CLOSURES
+
+ffi_status
+ffi_prep_closure (ffi_closure* closure,
+		  ffi_cif* cif,
+		  void (*fun)(ffi_cif*,void*,void**,void*),
+		  void *user_data)
+{
+  return ffi_prep_closure_loc (closure, cif, fun, user_data, closure);
+}
+
+#endif