re PR other/48981 (bootstrap-lto -O3 produces miscompiled, broken gcc)

2011-05-27  Andrew Pinski  <pinskia@gmail.com>

	PR middle-end/48981
	* gengtype.c (vec_prefix_type): New function.
	(note_def_vec): Use vec_prefix_type and change the length
	attribute to be based on the prefix.
	* vec.c: Include coretypes.h before vec.h.
	(struct vec_prefix): Remove.
	(vec_gc_p_reserve): Change the offsetof to sizeof.
	(vec_gc_p_reserve_exact): Likewise.
	(vec_heap_p_reserve): Likewise.
	(vec_heap_p_reserve_exact): Likewise.
	(vec_stack_o_reserve_1): Copy from +1 instead of from vec.
	(vec_stack_p_reserve): Change the offsetof to sizeof.
	(vec_stack_p_reserve_exact): Likewise.
	* vec.h (struct vec_prefix): New struct definition.
	(VEC_T(T,B)): Use vec_prefix instead of having num/alloc fields.
	(VEC_T_GTY(T,B)): Likewise.
	(DEF_VEC_FUNC_P(T)): Use prefix field.
	(DEF_VEC_NONALLOC_FUNCS_O(T,A)): Likewise.
	(DEF_VEC_NONALLOC_FUNCS_I(T,A)): Likewise.

From-SVN: r174359

1 files changed, 9 insertions, 17 deletions

diff --git a/gcc/vec.c b/gcc/vec.c
index 5b472bd..c1d0034 100644
--- a/gcc/vec.c
+++ b/gcc/vec.c
@@ -28,20 +28,12 @@ along with GCC; see the file COPYING3.  If not see
 #endif
 
 #include "system.h"
+#include "coretypes.h"
 #include "ggc.h"
 #include "vec.h"
-#include "coretypes.h"
 #include "diagnostic-core.h"
 #include "hashtab.h"
 
-struct vec_prefix
-{
-  unsigned num;
-  unsigned alloc;
-  void *vec[1];
-};
-
-
 #ifdef GATHER_STATISTICS
 
 /* Store information about each particular vector.  */
@@ -254,7 +246,7 @@ void *
 vec_gc_p_reserve (void *vec, int reserve MEM_STAT_DECL)
 {
   return vec_gc_o_reserve_1 (vec, reserve,
-			     offsetof (struct vec_prefix, vec),
+			     sizeof (struct vec_prefix),
 			     sizeof (void *), false
 			     PASS_MEM_STAT);
 }
@@ -268,7 +260,7 @@ void *
 vec_gc_p_reserve_exact (void *vec, int reserve MEM_STAT_DECL)
 {
   return vec_gc_o_reserve_1 (vec, reserve,
-			     offsetof (struct vec_prefix, vec),
+			     sizeof (struct vec_prefix),
 			     sizeof (void *), true
 			     PASS_MEM_STAT);
 }
@@ -337,7 +329,7 @@ void *
 vec_heap_p_reserve (void *vec, int reserve MEM_STAT_DECL)
 {
   return vec_heap_o_reserve_1 (vec, reserve,
-			       offsetof (struct vec_prefix, vec),
+			       sizeof (struct vec_prefix),
 			       sizeof (void *), false
 			       PASS_MEM_STAT);
 }
@@ -348,7 +340,7 @@ void *
 vec_heap_p_reserve_exact (void *vec, int reserve MEM_STAT_DECL)
 {
   return vec_heap_o_reserve_1 (vec, reserve,
-			       offsetof (struct vec_prefix, vec),
+			       sizeof (struct vec_prefix),
 			       sizeof (void *), true
 			       PASS_MEM_STAT);
 }
@@ -443,8 +435,8 @@ vec_stack_o_reserve_1 (void *vec, int reserve, size_t vec_offset,
   if (newvec && vec)
     {
       ((struct vec_prefix *) newvec)->num = ((struct vec_prefix *) vec)->num;
-      memcpy (((struct vec_prefix *) newvec)->vec,
-	      ((struct vec_prefix *) vec)->vec,
+      memcpy (((struct vec_prefix *) newvec)+1,
+	      ((struct vec_prefix *) vec)+1,
 	      ((struct vec_prefix *) vec)->num * elt_size);
     }
   return newvec;
@@ -456,7 +448,7 @@ void *
 vec_stack_p_reserve (void *vec, int reserve MEM_STAT_DECL)
 {
   return vec_stack_o_reserve_1 (vec, reserve,
-				offsetof (struct vec_prefix, vec),
+				sizeof (struct vec_prefix),
 				sizeof (void *), false
 				PASS_MEM_STAT);
 }
@@ -467,7 +459,7 @@ void *
 vec_stack_p_reserve_exact (void *vec, int reserve MEM_STAT_DECL)
 {
   return vec_stack_o_reserve_1 (vec, reserve,
-				offsetof (struct vec_prefix, vec),
+				sizeof (struct vec_prefix),
 				sizeof (void *), true
 				PASS_MEM_STAT);
 }