RE: [PING 2] [PATCH v3 1/1] gdb: Use a typedef's scoped type name to identify local typedefs

["Schimpe, Christina" <christina.schimpe@intel.com>]

Kindly pinging.
The changes made for V3 of this patch are described here: 
https://sourceware.org/pipermail/gdb-patches/2021-December/184601.html

Thanks,
Christina

> -----Original Message-----
> From: Schimpe, Christina
> Sent: Tuesday, January 18, 2022 8:11 PM
> To: gdb-patches@sourceware.org
> Subject: [PING] [PATCH v3 1/1] gdb: Use a typedef's scoped type name to
> identify local typedefs
> 
> Kindly pinging for this patch.
> 
> Thanks,
> Christina
> 
> -----Original Message-----
> From: Schimpe, Christina <christina.schimpe@intel.com>
> Sent: Monday, December 20, 2021 2:15 PM
> To: gdb-patches@sourceware.org
> Cc: Schimpe, Christina <christina.schimpe@intel.com>
> Subject: [PATCH v3 1/1] gdb: Use a typedef's scoped type name to identify
> local typedefs
> 
> GDB prints the wrong type for typedefs in case there is another typedef
> available for the same raw type (gdb/16040).  The reason is that the current
> hashmap based substitution mechanism always compares the target type of
> a typedef and not its scoped name.
> 
> The original output of GDB for a program like
> 
> ~~~~
> namespace ns
> {
>   typedef double scoped_double;
> }
> 
> typedef double global_double;
> 
> class TypedefHolder
> {
> public:
>   double a;
>   ns::scoped_double b;
>   global_double c;
> 
> private:
>   typedef double class_double;
>   class_double d;
> 
>   double method1(ns::scoped_double) { return 24.0; }
>   double method2(global_double) { return 24.0; } };
> 
> int main()
> {
>   TypedefHolder th;
>   return 0;
> }
> ~~~~
> 
> is
> ~~~~
> 
> (gdb) b 27
> Breakpoint 1 at 0x1131: file TypedefHolder.cc, line 27.
> (gdb) r
> Starting program: /tmp/typedefholder
> 
> Breakpoint 1, main () at TypedefHolder.cc:27
> 27	  return 0;
> (gdb) ptype th
> type = class TypedefHolder {
>   public:
>     class_double a;
>     class_double b;
>     class_double c;
>   private:
>     class_double d;
> 
>     class_double method1(class_double);
>     class_double method2(class_double);
> 
>     typedef double class_double;
> }
> ~~~~
> 
> Basically all attributes of a class which have the raw type "double" are
> substituted by "class_double".
> 
> With the patch the output is the following
> 
> ~~~~
> type = class TypedefHolder {
>   public:
>     double a;
>     ns::scoped_double b;
>     global_double c;
>   private:
>     class_double d;
> 
>     double method1(ns::scoped_double);
>     double method2(global_double);
> 
>     typedef double class_double;
> }
> ~~~~
> ---
>  gdb/testsuite/gdb.cp/ptype-flags.cc  | 23 ++++++++
> gdb/testsuite/gdb.cp/ptype-flags.exp | 88 ++++++++++++++++++++++------
>  gdb/typeprint.c                      |  3 +-
>  3 files changed, 95 insertions(+), 19 deletions(-)
> 
> diff --git a/gdb/testsuite/gdb.cp/ptype-flags.cc
> b/gdb/testsuite/gdb.cp/ptype-flags.cc
> index fc92d3950c..564d272e57 100644
> --- a/gdb/testsuite/gdb.cp/ptype-flags.cc
> +++ b/gdb/testsuite/gdb.cp/ptype-flags.cc
> @@ -38,7 +38,30 @@ public:
>    double method(void) { return 23.0; }
>  };
> 
> +namespace ns
> +{
> +  typedef double scoped_double;
> +}
> +
> +typedef double global_double;
> +
> +class TypedefHolder
> +{
> +public:
> +  double a;
> +  ns::scoped_double b;
> +  global_double c;
> +
> +private:
> +  typedef double class_double;
> +  class_double d;
> +
> +  double method1(ns::scoped_double) { return 24.0; }  double
> + method2(global_double) { return 24.0; } };
> +
>  Holder<int> value;
> +TypedefHolder value2;
> 
>  int main()
>  {
> diff --git a/gdb/testsuite/gdb.cp/ptype-flags.exp
> b/gdb/testsuite/gdb.cp/ptype-flags.exp
> index c368415793..9734a70ee2 100644
> --- a/gdb/testsuite/gdb.cp/ptype-flags.exp
> +++ b/gdb/testsuite/gdb.cp/ptype-flags.exp
> @@ -33,7 +33,9 @@ if ![runto_main] then {  gdb_test_no_output "set
> language c++" ""
>  gdb_test_no_output "set width 0" ""
> 
> -proc do_check {name {flags ""} {show_typedefs 1} {show_methods 1} {raw
> 0}} {
> +proc do_check_holder {name {flags ""} {show_typedefs 1} {show_methods
> 1}
> +		      {raw 0}} {
> +
>      set contents {
>  	{ base "public Base<T>" }
>  	{ field public "Simple<T> t;" }
> @@ -62,24 +64,76 @@ proc do_check {name {flags ""} {show_typedefs 1}
> {show_methods 1} {raw 0}} {
>  	"" {} $flags
>  }
> 
> -do_check "basic test"
> -do_check "no methods" "/m" 1 0
> -do_check "no typedefs" "/t" 0 1
> -do_check "no methods or typedefs" "/mt" 0 0
> +proc do_check_typedef_holder {name {flags ""} {show_typedefs 1}
> {show_methods 1}
> +			      {raw 0}} {
> +
> +    set contents {
> +	{ field public "double a;" }
> +	{ field public "ns::scoped_double b;" }
> +	{ field public "global_double c;" }
> +    }
> +
> +    if {$show_typedefs} {
> +	lappend contents { typedef private "typedef double class_double;" }
> +    }
> +
> +    if {$show_methods} {
> +	lappend contents { method private "double
> method1(ns::scoped_double);" }
> +	lappend contents { method private "double
> method2(global_double);" }
> +    }
> +
> +    if {$raw} {
> +	lappend contents { field private "TypedefHolder::class_double d;" }
> +    } else {
> +	lappend contents { field private "class_double d;" }
> +    }
> +
> +    cp_test_ptype_class value2 $name "class" "TypedefHolder" $contents \
> +	"" {} $flags
> +}
> 
> -do_check "raw" "/r" 1 1 1
> -do_check "raw no methods" "/rm" 1 0 1
> -do_check "raw no typedefs" "/rt" 0 1 1
> -do_check "raw no methods or typedefs" "/rmt" 0 0 1
> +do_check_holder "basic test"
> +do_check_holder "no methods" "/m" 1 0
> +do_check_holder "no typedefs" "/t" 0 1
> +do_check_holder "no methods or typedefs" "/mt" 0 0
> +do_check_typedef_holder "typdefs class: basic test"
> +do_check_typedef_holder "typdefs class: no methods" "/m" 1 0
> +do_check_typedef_holder "typdefs class: no typedefs" "/t" 0 1 0
> +do_check_typedef_holder "typdefs class:no methods or typedefs" "/mt" 0
> +0
> +
> +do_check_holder "raw" "/r" 1 1 1
> +do_check_holder "raw no methods" "/rm" 1 0 1 do_check_holder "raw no
> +typedefs" "/rt" 0 1 1 do_check_holder "raw no methods or typedefs"
> +"/rmt" 0 0 1 do_check_typedef_holder "typedef class: raw" "/r" 1 1 1
> +do_check_typedef_holder "typedef class: raw no methods" "/rm" 1 0 1
> +do_check_typedef_holder "typedef class: raw no typedefs" "/rt" 0 1 1
> +do_check_typedef_holder "typedef class: raw no methods or typedefs"
> +"/rmt" 0 0 1
> 
>  gdb_test_no_output "set print type methods off"
> -do_check "basic test, default methods off" "" 1 0 -do_check "methods,
> default methods off" "/M" 1 1 -do_check "no typedefs, default methods off"
> "/t" 0 0 -do_check "methods, no typedefs, default methods off" "/Mt" 0 1
> +do_check_holder "basic test, default methods off" "" 1 0
> +do_check_holder "methods, default methods off" "/M" 1 1
> do_check_holder
> +"no typedefs, default methods off" "/t" 0 0 do_check_holder "methods,
> +no typedefs, default methods off" "/Mt" 0 1 do_check_typedef_holder \
> +    "typedef class: basic test, default methods off" "" 1 0
> +do_check_typedef_holder \
> +    "typedef class: methods, default methods off" "/M" 1 1
> +do_check_typedef_holder \
> +    "typedef class: no typedefs, default methods off" "/t" 0 0
> +do_check_typedef_holder \
> +    "typedef class: methods, no typedefs, default methods off" "/Mt" 0
> +1
> 
>  gdb_test_no_output "set print type typedefs off"
> -do_check "basic test, default methods+typedefs off" "" 0 0 -do_check
> "methods, default methods+typedefs off" "/M" 0 1 -do_check "typedefs,
> default methods+typedefs off" "/T" 1 0 -do_check "methods typedefs,
> default methods+typedefs off" "/MT" 1 1
> +do_check_holder "basic test, default methods+typedefs off" "" 0 0
> +do_check_holder "methods, default methods+typedefs off" "/M" 0 1
> +do_check_holder "typedefs, default methods+typedefs off" "/T" 1 0
> +do_check_holder "methods typedefs, default methods+typedefs off"
> "/MT"
> +1 1 do_check_typedef_holder \
> +    "typedef class: basic test, default methods+typedefs off" "" 0 0
> +do_check_typedef_holder \
> +    "typedef class: methods, default methods+typedefs off" "/M" 0 1
> +do_check_typedef_holder \
> +    "typedef class: typedefs, default methods+typedefs off" "/T" 1 0
> +do_check_typedef_holder \
> +    "typedef class: methods typedefs, default methods+typedefs off"
> +"/MT" 1 1
> diff --git a/gdb/typeprint.c b/gdb/typeprint.c index 1312111b60..98f6af4104
> 100644
> --- a/gdb/typeprint.c
> +++ b/gdb/typeprint.c
> @@ -201,9 +201,8 @@ static hashval_t
>  hash_typedef_field (const void *p)
>  {
>    const struct decl_field *tf = (const struct decl_field *) p;
> -  struct type *t = check_typedef (tf->type);
> 
> -  return htab_hash_string (TYPE_SAFE_NAME (t));
> +  return htab_hash_string (TYPE_SAFE_NAME (tf->type));
>  }
> 
>  /* An equality function for a typedef field.  */
> --
> 2.25.1

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