Change how complex types are created

This patch changes how complex types are created.  init_complex_type
and arch_complex_type are unified, and complex types are reused, by
attaching them to the underlying scalar type.

gdb/ChangeLog
2020-04-01  Tom Tromey  <tom@tromey.com>

	* stabsread.c (rs6000_builtin_type, read_sun_floating_type)
	(read_range_type): Update.
	* mdebugread.c (basic_type): Update.
	* go-lang.c (build_go_types): Use init_complex_type.
	* gdbtypes.h (struct main_type) <complex_type>: New member.
	(init_complex_type): Update.
	(arch_complex_type): Don't declare.
	* gdbtypes.c (init_complex_type): Remove "objfile" parameter.
	Make name if none given.  Use alloc_type_copy.  Look for cached
	complex type.
	(arch_complex_type): Remove.
	(gdbtypes_post_init): Use init_complex_type.
	* f-lang.c (build_fortran_types): Use init_complex_type.
	* dwarf2/read.c (read_base_type): Update.
	* d-lang.c (build_d_types): Use init_complex_type.
	* ctfread.c (read_base_type): Update.

10 files changed, 71 insertions, 57 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index ef62216e..7a883e8 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,22 @@
+2020-04-01  Tom Tromey  <tom@tromey.com>
+
+	* stabsread.c (rs6000_builtin_type, read_sun_floating_type)
+	(read_range_type): Update.
+	* mdebugread.c (basic_type): Update.
+	* go-lang.c (build_go_types): Use init_complex_type.
+	* gdbtypes.h (struct main_type) <complex_type>: New member.
+	(init_complex_type): Update.
+	(arch_complex_type): Don't declare.
+	* gdbtypes.c (init_complex_type): Remove "objfile" parameter.
+	Make name if none given.  Use alloc_type_copy.  Look for cached
+	complex type.
+	(arch_complex_type): Remove.
+	(gdbtypes_post_init): Use init_complex_type.
+	* f-lang.c (build_fortran_types): Use init_complex_type.
+	* dwarf2/read.c (read_base_type): Update.
+	* d-lang.c (build_d_types): Use init_complex_type.
+	* ctfread.c (read_base_type): Update.
+
 2020-04-01  Tankut Baris Aktemur  <tankut.baris.aktemur@intel.com>
 
 	* infrun.c (stop_all_threads): Update assertion, plus when
diff --git a/gdb/ctfread.c b/gdb/ctfread.c
index 241d0b6..7784e9d 100644
--- a/gdb/ctfread.c
+++ b/gdb/ctfread.c
@@ -553,7 +553,7 @@ read_base_type (struct ctf_context *ccp, ctf_id_t tid)
 	{
 	  struct type *t
 	    = ctf_init_float_type (of, cet.cte_bits / 2, NULL, name);
-	  type = init_complex_type (of, name, t);
+	  type = init_complex_type (name, t);
 	}
     }
   else
diff --git a/gdb/d-lang.c b/gdb/d-lang.c
index f50c31a..951e664 100644
--- a/gdb/d-lang.c
+++ b/gdb/d-lang.c
@@ -314,14 +314,11 @@ build_d_types (struct gdbarch *gdbarch)
     = arch_float_type (gdbarch, gdbarch_long_double_bit (gdbarch),
 		       "ireal", gdbarch_long_double_format (gdbarch));
   builtin_d_type->builtin_cfloat
-    = arch_complex_type (gdbarch, "cfloat",
-			 builtin_d_type->builtin_float);
+    = init_complex_type ("cfloat", builtin_d_type->builtin_float);
   builtin_d_type->builtin_cdouble
-    = arch_complex_type (gdbarch, "cdouble",
-			 builtin_d_type->builtin_double);
+    = init_complex_type ("cdouble", builtin_d_type->builtin_double);
   builtin_d_type->builtin_creal
-    = arch_complex_type (gdbarch, "creal",
-			 builtin_d_type->builtin_real);
+    = init_complex_type ("creal", builtin_d_type->builtin_real);
 
   /* Character types.  */
   builtin_d_type->builtin_char
diff --git a/gdb/dwarf2/read.c b/gdb/dwarf2/read.c
index 6ee33fc..2db527e 100644
--- a/gdb/dwarf2/read.c
+++ b/gdb/dwarf2/read.c
@@ -16880,7 +16880,7 @@ read_base_type (struct die_info *die, struct dwarf2_cu *cu)
       case DW_ATE_complex_float:
 	type = dwarf2_init_complex_target_type (cu, objfile, bits / 2, name,
 						byte_order);
-	type = init_complex_type (objfile, name, type);
+	type = init_complex_type (name, type);
 	break;
       case DW_ATE_decimal_float:
 	type = init_decfloat_type (objfile, bits, name);
diff --git a/gdb/f-lang.c b/gdb/f-lang.c
index 75a131d..2ce4ad4 100644
--- a/gdb/f-lang.c
+++ b/gdb/f-lang.c
@@ -741,14 +741,11 @@ build_fortran_types (struct gdbarch *gdbarch)
       = arch_type (gdbarch, TYPE_CODE_ERROR, 128, "real*16");
 
   builtin_f_type->builtin_complex_s8
-    = arch_complex_type (gdbarch, "complex*8",
-			 builtin_f_type->builtin_real);
+    = init_complex_type ("complex*8", builtin_f_type->builtin_real);
   builtin_f_type->builtin_complex_s16
-    = arch_complex_type (gdbarch, "complex*16",
-			 builtin_f_type->builtin_real_s8);
+    = init_complex_type ("complex*16", builtin_f_type->builtin_real_s8);
   builtin_f_type->builtin_complex_s32
-    = arch_complex_type (gdbarch, "complex*32",
-			 builtin_f_type->builtin_real_s16);
+    = init_complex_type ("complex*32", builtin_f_type->builtin_real_s16);
 
   return builtin_f_type;
 }
diff --git a/gdb/gdbtypes.c b/gdb/gdbtypes.c
index d89df9f..f23def1 100644
--- a/gdb/gdbtypes.c
+++ b/gdb/gdbtypes.c
@@ -3025,19 +3025,40 @@ init_decfloat_type (struct objfile *objfile, int bit, const char *name)
   return t;
 }
 
-/* Allocate a TYPE_CODE_COMPLEX type structure associated with OBJFILE.
-   NAME is the type name.  TARGET_TYPE is the component float type.  */
+/* Allocate a TYPE_CODE_COMPLEX type structure.  NAME is the type
+   name.  TARGET_TYPE is the component type.  */
 
 struct type *
-init_complex_type (struct objfile *objfile,
-		   const char *name, struct type *target_type)
+init_complex_type (const char *name, struct type *target_type)
 {
   struct type *t;
 
-  t = init_type (objfile, TYPE_CODE_COMPLEX,
-		 2 * TYPE_LENGTH (target_type) * TARGET_CHAR_BIT, name);
-  TYPE_TARGET_TYPE (t) = target_type;
-  return t;
+  gdb_assert (TYPE_CODE (target_type) == TYPE_CODE_INT
+	      || TYPE_CODE (target_type) == TYPE_CODE_FLT);
+
+  if (TYPE_MAIN_TYPE (target_type)->flds_bnds.complex_type == nullptr)
+    {
+      if (name == nullptr)
+	{
+	  char *new_name
+	    = (char *) TYPE_ALLOC (target_type,
+				   strlen (TYPE_NAME (target_type))
+				   + strlen ("_Complex ") + 1);
+	  strcpy (new_name, "_Complex ");
+	  strcat (new_name, TYPE_NAME (target_type));
+	  name = new_name;
+	}
+
+      t = alloc_type_copy (target_type);
+      set_type_code (t, TYPE_CODE_COMPLEX);
+      TYPE_LENGTH (t) = 2 * TYPE_LENGTH (target_type);
+      TYPE_NAME (t) = name;
+
+      TYPE_TARGET_TYPE (t) = target_type;
+      TYPE_MAIN_TYPE (target_type)->flds_bnds.complex_type = t;
+    }
+
+  return TYPE_MAIN_TYPE (target_type)->flds_bnds.complex_type;
 }
 
 /* Allocate a TYPE_CODE_PTR type structure associated with OBJFILE.
@@ -5259,21 +5280,6 @@ arch_decfloat_type (struct gdbarch *gdbarch, int bit, const char *name)
   return t;
 }
 
-/* Allocate a TYPE_CODE_COMPLEX type structure associated with GDBARCH.
-   NAME is the type name.  TARGET_TYPE is the component float type.  */
-
-struct type *
-arch_complex_type (struct gdbarch *gdbarch,
-		   const char *name, struct type *target_type)
-{
-  struct type *t;
-
-  t = arch_type (gdbarch, TYPE_CODE_COMPLEX,
-		 2 * TYPE_LENGTH (target_type) * TARGET_CHAR_BIT, name);
-  TYPE_TARGET_TYPE (t) = target_type;
-  return t;
-}
-
 /* Allocate a TYPE_CODE_PTR type structure associated with GDBARCH.
    BIT is the pointer type size in bits.  NAME is the type name.
    TARGET_TYPE is the pointer target type.  Always sets the pointer type's
@@ -5497,11 +5503,9 @@ gdbtypes_post_init (struct gdbarch *gdbarch)
     = arch_float_type (gdbarch, gdbarch_long_double_bit (gdbarch),
 		       "long double", gdbarch_long_double_format (gdbarch));
   builtin_type->builtin_complex
-    = arch_complex_type (gdbarch, "complex",
-			 builtin_type->builtin_float);
+    = init_complex_type ("complex", builtin_type->builtin_float);
   builtin_type->builtin_double_complex
-    = arch_complex_type (gdbarch, "double complex",
-			 builtin_type->builtin_double);
+    = init_complex_type ("double complex", builtin_type->builtin_double);
   builtin_type->builtin_string
     = arch_type (gdbarch, TYPE_CODE_STRING, TARGET_CHAR_BIT, "string");
   builtin_type->builtin_bool
diff --git a/gdb/gdbtypes.h b/gdb/gdbtypes.h
index cb674db..77cc92e 100644
--- a/gdb/gdbtypes.h
+++ b/gdb/gdbtypes.h
@@ -803,6 +803,10 @@ struct main_type
 
     struct range_bounds *bounds;
 
+    /* If this is a scalar type, then this is its corresponding
+       complex type.  */
+    struct type *complex_type;
+
   } flds_bnds;
 
   /* * Slot to point to additional language-specific fields of this
@@ -1841,8 +1845,7 @@ extern struct type *init_float_type (struct objfile *, int, const char *,
 				     const struct floatformat **,
 				     enum bfd_endian = BFD_ENDIAN_UNKNOWN);
 extern struct type *init_decfloat_type (struct objfile *, int, const char *);
-extern struct type *init_complex_type (struct objfile *, const char *,
-				       struct type *);
+extern struct type *init_complex_type (const char *, struct type *);
 extern struct type *init_pointer_type (struct objfile *, int, const char *,
 				       struct type *);
 
@@ -1858,8 +1861,6 @@ extern struct type *arch_boolean_type (struct gdbarch *, int, int,
 extern struct type *arch_float_type (struct gdbarch *, int, const char *,
 				     const struct floatformat **);
 extern struct type *arch_decfloat_type (struct gdbarch *, int, const char *);
-extern struct type *arch_complex_type (struct gdbarch *, const char *,
-				       struct type *);
 extern struct type *arch_pointer_type (struct gdbarch *, int, const char *,
 				       struct type *);
 
diff --git a/gdb/go-lang.c b/gdb/go-lang.c
index 53e3429..03dc986 100644
--- a/gdb/go-lang.c
+++ b/gdb/go-lang.c
@@ -665,11 +665,9 @@ build_go_types (struct gdbarch *gdbarch)
   builtin_go_type->builtin_float64
     = arch_float_type (gdbarch, 64, "float64", floatformats_ieee_double);
   builtin_go_type->builtin_complex64
-    = arch_complex_type (gdbarch, "complex64",
-			 builtin_go_type->builtin_float32);
+    = init_complex_type ("complex64", builtin_go_type->builtin_float32);
   builtin_go_type->builtin_complex128
-    = arch_complex_type (gdbarch, "complex128",
-			 builtin_go_type->builtin_float64);
+    = init_complex_type ("complex128", builtin_go_type->builtin_float64);
 
   return builtin_go_type;
 }
diff --git a/gdb/mdebugread.c b/gdb/mdebugread.c
index d9ad8ee..bac6fd6 100644
--- a/gdb/mdebugread.c
+++ b/gdb/mdebugread.c
@@ -1429,13 +1429,11 @@ basic_type (int bt, struct objfile *objfile)
       break;
 
     case btComplex:
-      tp = init_complex_type (objfile, "complex",
-			      basic_type (btFloat, objfile));
+      tp = init_complex_type ("complex", basic_type (btFloat, objfile));
       break;
 
     case btDComplex:
-      tp = init_complex_type (objfile, "double complex",
-			      basic_type (btFloat, objfile));
+      tp = init_complex_type ("double complex", basic_type (btFloat, objfile));
       break;
 
     case btFixedDec:
diff --git a/gdb/stabsread.c b/gdb/stabsread.c
index a23ebf6..068ece2 100644
--- a/gdb/stabsread.c
+++ b/gdb/stabsread.c
@@ -2186,12 +2186,12 @@ rs6000_builtin_type (int typenum, struct objfile *objfile)
       break;
     case 25:
       /* Complex type consisting of two IEEE single precision values.  */
-      rettype = init_complex_type (objfile, "complex",
+      rettype = init_complex_type ("complex",
 				   rs6000_builtin_type (12, objfile));
       break;
     case 26:
       /* Complex type consisting of two IEEE double precision values.  */
-      rettype = init_complex_type (objfile, "double complex",
+      rettype = init_complex_type ("double complex",
 				   rs6000_builtin_type (13, objfile));
       break;
     case 27:
@@ -3805,7 +3805,7 @@ read_sun_floating_type (const char **pp, int typenums[2],
       || details == NF_COMPLEX32)
     {
       rettype = dbx_init_float_type (objfile, nbits / 2);
-      return init_complex_type (objfile, NULL, rettype);
+      return init_complex_type (NULL, rettype);
     }
 
   return dbx_init_float_type (objfile, nbits);
@@ -4099,7 +4099,7 @@ read_range_type (const char **pp, int typenums[2], int type_size,
 	= dbx_init_float_type (objfile, n2 * TARGET_CHAR_BIT);
 
       if (self_subrange)
-	return init_complex_type (objfile, NULL, float_type);
+	return init_complex_type (NULL, float_type);
       else
 	return float_type;
     }