[PATCH, i386, MPX, 1/X] Support of Intel MPX ISA. 1/2 Bound type and modes

[Ilya Enkovich <enkovich dot gnu at gmail dot com>]

Hi,

Here is a patch introducing new type and mode for bounds. It is a part of MPX ISA support patch (http://gcc.gnu.org/ml/gcc-patches/2013-07/msg01094.html).

Bootstrapped and tested on linux-x86_64. Is it OK for trunk?

Thanks,
Ilya
--

gcc/

2013-09-16  Ilya Enkovich  <ilya.enkovich@intel.com>

	* mode-classes.def (MODE_BOUND): New.
	* tree.def (BOUND_TYPE): New.
	* genmodes.c (complete_mode): Support MODE_BOUND.
	(BOUND_MODE): New.
	(make_bound_mode): New.
	* machmode.h (BOUND_MODE_P): New.
	* stor-layout.c (int_mode_for_mode): Support MODE_BOUND.
	(layout_type): Support BOUND_TYPE.
	* tree-pretty-print.c (dump_generic_node): Support BOUND_TYPE.
	* tree.c (build_int_cst_wide): Support BOUND_TYPE.
	(type_contains_placeholder_1): Likewise.
	* tree.h (BOUND_TYPE_P): New.
	* varasm.c (output_constant): Support BOUND_TYPE.
	* doc/rtl.texi (MODE_BOUND): New.

diff --git a/gcc/doc/rtl.texi b/gcc/doc/rtl.texi
index 1d62223..02b1214 100644
--- a/gcc/doc/rtl.texi
+++ b/gcc/doc/rtl.texi
@@ -1382,6 +1382,10 @@ any @code{CC_MODE} modes listed in the @file{@var{machine}-modes.def}.
 @xref{Jump Patterns},
 also see @ref{Condition Code}.
 
+@findex MODE_BOUND
+@item MODE_BOUND
+Bound modes class.  Used to represent values of pointer bounds.
+
 @findex MODE_RANDOM
 @item MODE_RANDOM
 This is a catchall mode class for modes which don't fit into the above
diff --git a/gcc/genmodes.c b/gcc/genmodes.c
index dc38483..89174ec 100644
--- a/gcc/genmodes.c
+++ b/gcc/genmodes.c
@@ -333,6 +333,7 @@ complete_mode (struct mode_data *m)
       break;
 
     case MODE_INT:
+    case MODE_BOUND:
     case MODE_FLOAT:
     case MODE_DECIMAL_FLOAT:
     case MODE_FRACT:
@@ -533,6 +534,18 @@ make_special_mode (enum mode_class cl, const char *name,
   new_mode (cl, name, file, line);
 }
 
+#define BOUND_MODE(N, Y) make_bound_mode (#N, Y, __FILE__, __LINE__)
+
+static void ATTRIBUTE_UNUSED
+make_bound_mode (const char *name,
+               unsigned int bytesize,
+               const char *file, unsigned int line)
+{
+  struct mode_data *m = new_mode (MODE_BOUND, name, file, line);
+  m->bytesize = bytesize;
+}
+
+
 #define INT_MODE(N, Y) FRACTIONAL_INT_MODE (N, -1U, Y)
 #define FRACTIONAL_INT_MODE(N, B, Y) \
   make_int_mode (#N, B, Y, __FILE__, __LINE__)
diff --git a/gcc/machmode.h b/gcc/machmode.h
index 981ee92..d4a20b2 100644
--- a/gcc/machmode.h
+++ b/gcc/machmode.h
@@ -174,6 +174,9 @@ extern const unsigned char mode_class[NUM_MACHINE_MODES];
    || CLASS == MODE_ACCUM                      \
    || CLASS == MODE_UACCUM)
 
+#define BOUND_MODE_P(MODE)      \
+  (GET_MODE_CLASS (MODE) == MODE_BOUND)
+
 /* Get the size in bytes and bits of an object of mode MODE.  */
 
 extern CONST_MODE_SIZE unsigned char mode_size[NUM_MACHINE_MODES];
diff --git a/gcc/mode-classes.def b/gcc/mode-classes.def
index 7207ef7..c5ea215 100644
--- a/gcc/mode-classes.def
+++ b/gcc/mode-classes.def
@@ -21,6 +21,7 @@ along with GCC; see the file COPYING3.  If not see
   DEF_MODE_CLASS (MODE_RANDOM),		/* other */			   \
   DEF_MODE_CLASS (MODE_CC),		/* condition code in a register */ \
   DEF_MODE_CLASS (MODE_INT),		/* integer */			   \
+  DEF_MODE_CLASS (MODE_BOUND),            /* bounds */                     \
   DEF_MODE_CLASS (MODE_PARTIAL_INT),	/* integer with padding bits */    \
   DEF_MODE_CLASS (MODE_FRACT),		/* signed fractional number */	   \
   DEF_MODE_CLASS (MODE_UFRACT),		/* unsigned fractional number */   \
diff --git a/gcc/stor-layout.c b/gcc/stor-layout.c
index 6f6b310..82611c7 100644
--- a/gcc/stor-layout.c
+++ b/gcc/stor-layout.c
@@ -383,6 +383,7 @@ int_mode_for_mode (enum machine_mode mode)
     case MODE_VECTOR_ACCUM:
     case MODE_VECTOR_UFRACT:
     case MODE_VECTOR_UACCUM:
+    case MODE_BOUND:
       mode = mode_for_size (GET_MODE_BITSIZE (mode), MODE_INT, 0);
       break;
 
@@ -2135,6 +2136,13 @@ layout_type (tree type)
       SET_TYPE_MODE (type, VOIDmode);
       break;
 
+    case BOUND_TYPE:
+      SET_TYPE_MODE (type,
+                     mode_for_size (TYPE_PRECISION (type), MODE_BOUND, 0));
+      TYPE_SIZE (type) = bitsize_int (GET_MODE_BITSIZE (TYPE_MODE (type)));
+      TYPE_SIZE_UNIT (type) = size_int (GET_MODE_SIZE (TYPE_MODE (type)));
+      break;
+
     case OFFSET_TYPE:
       TYPE_SIZE (type) = bitsize_int (POINTER_SIZE);
       TYPE_SIZE_UNIT (type) = size_int (POINTER_SIZE / BITS_PER_UNIT);
diff --git a/gcc/tree-pretty-print.c b/gcc/tree-pretty-print.c
index 69e4006..8b0825c 100644
--- a/gcc/tree-pretty-print.c
+++ b/gcc/tree-pretty-print.c
@@ -697,6 +697,7 @@ dump_generic_node (pretty_printer *buffer, tree node, int spc, int flags,
       break;
 
     case VOID_TYPE:
+    case BOUND_TYPE:
     case INTEGER_TYPE:
     case REAL_TYPE:
     case FIXED_POINT_TYPE:
diff --git a/gcc/tree.c b/gcc/tree.c
index b469b97..bbbe16e 100644
--- a/gcc/tree.c
+++ b/gcc/tree.c
@@ -1197,6 +1197,7 @@ build_int_cst_wide (tree type, unsigned HOST_WIDE_INT low, HOST_WIDE_INT hi)
 
     case INTEGER_TYPE:
     case OFFSET_TYPE:
+    case BOUND_TYPE:
       if (TYPE_UNSIGNED (type))
 	{
 	  /* Cache 0..N */
@@ -3232,6 +3233,7 @@ type_contains_placeholder_1 (const_tree type)
   switch (TREE_CODE (type))
     {
     case VOID_TYPE:
+    case BOUND_TYPE:
     case COMPLEX_TYPE:
     case ENUMERAL_TYPE:
     case BOOLEAN_TYPE:
diff --git a/gcc/tree.def b/gcc/tree.def
index f825aad..b01cdd5 100644
--- a/gcc/tree.def
+++ b/gcc/tree.def
@@ -232,6 +232,11 @@ DEFTREECODE (QUAL_UNION_TYPE, "qual_union_type", tcc_type, 0)
 /* The void type in C */
 DEFTREECODE (VOID_TYPE, "void_type", tcc_type, 0)
 
+/* Type to hold bounds for a pointer.
+   Has TYPE_PRECISION component to specify number of bits used
+   by this type.  */
+DEFTREECODE (BOUND_TYPE, "bound_type", tcc_type, 0)
+
 /* Type of functions.  Special fields:
    TREE_TYPE		    type of value returned.
    TYPE_ARG_TYPES      list of types of arguments expected.
diff --git a/gcc/tree.h b/gcc/tree.h
index 83edaba..863a204 100644
--- a/gcc/tree.h
+++ b/gcc/tree.h
@@ -1097,6 +1097,10 @@ extern void omp_clause_range_check_failed (const_tree, const char *, int,
 /* Nonzero if this type is a complete type.  */
 #define COMPLETE_TYPE_P(NODE) (TYPE_SIZE (NODE) != NULL_TREE)
 
+/* Nonzero if this type is a bound type.  */
+#define BOUND_TYPE_P(NODE) \
+  (TREE_CODE (NODE) == BOUND_TYPE)
+
 /* Nonzero if this type is the (possibly qualified) void type.  */
 #define VOID_TYPE_P(NODE) (TREE_CODE (NODE) == VOID_TYPE)
 
diff --git a/gcc/varasm.c b/gcc/varasm.c
index 0504eeb..2b5305b 100644
--- a/gcc/varasm.c
+++ b/gcc/varasm.c
@@ -4703,6 +4703,7 @@ output_constant (tree exp, unsigned HOST_WIDE_INT size, unsigned int align)
     case REFERENCE_TYPE:
     case OFFSET_TYPE:
     case FIXED_POINT_TYPE:
+    case BOUND_TYPE:
       if (! assemble_integer (expand_expr (exp, NULL_RTX, VOIDmode,
 					   EXPAND_INITIALIZER),
 			      MIN (size, thissize), align, 0))