Print location for conflicting global regs.

gcc/

2011-06-08  Andi Kleen  <ak@linux.intel.com>

	* reginfo.c (global_regs_decl): Add.
	(globalize_reg): Add decl parameter. Compute location.
	Pass location to warnings and add inform. Store decl
	in global_regs_decl.
	* rtl.h (globalize_reg): Update prototype.
	* varasm.c (make_decl_rtl): Pass decl to globalize_reg().

From-SVN: r174834

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 821771a..fb53fdc 100644 (file)
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,12 @@
+2011-06-08  Andi Kleen  <ak@linux.intel.com>
+
+       * reginfo.c (global_regs_decl): Add.
+       (globalize_reg): Add decl parameter. Compute location.
+       Pass location to warnings and add inform. Store decl
+       in global_regs_decl.
+       * rtl.h (globalize_reg): Update prototype.
+       * varasm.c (make_decl_rtl): Pass decl to globalize_reg().
+
 2011-06-09  Mingjie Xing  <mingjie.xing@gmail.com>
 
        * treestruct.def (TS_TYPE_DECL): Fix the printable name typo.

diff --git a/gcc/reginfo.c b/gcc/reginfo.c
index a283a90..1da4cb8 100644 (file)
--- a/gcc/reginfo.c
+++ b/gcc/reginfo.c
@@ -87,6 +87,9 @@ static const char initial_call_really_used_regs[] = CALL_REALLY_USED_REGISTERS;
    and are also considered fixed.  */
 char global_regs[FIRST_PSEUDO_REGISTER];
 
+/* Declaration for the global register. */
+static tree GTY(()) global_regs_decl[FIRST_PSEUDO_REGISTER];
+
 /* Same information as REGS_INVALIDATED_BY_CALL but in regset form to be used
    in dataflow more conveniently.  */
 regset regs_invalidated_by_call_regset;
@@ -825,8 +828,10 @@ fix_register (const char *name, int fixed, int call_used)
 
 /* Mark register number I as global.  */
 void
-globalize_reg (int i)
+globalize_reg (tree decl, int i)
 {
+  location_t loc = DECL_SOURCE_LOCATION (decl);
+
 #ifdef STACK_REGS
   if (IN_RANGE (i, FIRST_STACK_REG, LAST_STACK_REG))
     {
@@ -836,18 +841,23 @@ globalize_reg (int i)
 #endif
 
   if (fixed_regs[i] == 0 && no_global_reg_vars)
-    error ("global register variable follows a function definition");
+    error_at (loc, "global register variable follows a function definition");
 
   if (global_regs[i])
     {
-      warning (0, "register used for two global register variables");
+      warning_at (loc, 0, 
+                 "register of %qD used for multiple global register variables",
+                 decl);
+      inform (DECL_SOURCE_LOCATION (global_regs_decl[i]),
+             "conflicts with %qD", global_regs_decl[i]); 
       return;
     }
 
   if (call_used_regs[i] && ! fixed_regs[i])
-    warning (0, "call-clobbered register used for global register variable");
+    warning_at (loc, 0, "call-clobbered register used for global register variable");
 
   global_regs[i] = 1;
+  global_regs_decl[i] = decl;
 
   /* If we're globalizing the frame pointer, we need to set the
      appropriate regs_invalidated_by_call bit, even if it's already

diff --git a/gcc/rtl.h b/gcc/rtl.h
index 62b677a..f2c2983 100644 (file)
--- a/gcc/rtl.h
+++ b/gcc/rtl.h
@@ -2451,7 +2451,7 @@ extern void mark_elimination (int, int);
 /* In reginfo.c */
 extern int reg_classes_intersect_p (reg_class_t, reg_class_t);
 extern int reg_class_subset_p (reg_class_t, reg_class_t);
-extern void globalize_reg (int);
+extern void globalize_reg (tree, int);
 extern void init_reg_modes_target (void);
 extern void init_regs (void);
 extern void reinit_regs (void);

diff --git a/gcc/varasm.c b/gcc/varasm.c
index f46c21b..3311c86 100644 (file)
--- a/gcc/varasm.c
+++ b/gcc/varasm.c
@@ -1237,7 +1237,7 @@ make_decl_rtl (tree decl)
 #endif
              nregs = hard_regno_nregs[reg_number][DECL_MODE (decl)];
              while (nregs > 0)
-               globalize_reg (reg_number + --nregs);
+               globalize_reg (decl, reg_number + --nregs);
            }
 
          /* As a register variable, it has no section.  */