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d: Compile-time reflection for supported built-ins (PR101127)

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In order to allow user-code to determine whether a back-end builtin is
available without error, LANG_HOOKS_BUILTIN_FUNCTION_EXT_SCOPE has been
defined to delay putting back-end builtin functions until the ISA that
defines them has been declared.

However in D, there is no global namespace.  All builtins get pushed
into the `gcc.builtins' module, which is constructed during the semantic
analysis pass, which has already finished by the time target attributes
are evaluated.  So builtins are not pushed by the new langhook because
they would be ultimately ignored.  Builtins exposed to D code then can
now only be altered by the command-line.

	PR d/101127

gcc/d/ChangeLog:

	* d-builtins.cc (d_builtin_function_ext_scope): New function.
	* d-lang.cc (LANG_HOOKS_BUILTIN_FUNCTION_EXT_SCOPE): Define.
	* d-tree.h (d_builtin_function_ext_scope): Declare.

gcc/testsuite/ChangeLog:

	* gdc.dg/pr101127a.d: New test.
	* gdc.dg/pr101127b.d: New test.
This commit is contained in:
Iain Buclaw 2021-07-25 23:19:36 +02:00
parent 3e21361174
commit b2f6e1de24
5 changed files with 33 additions and 0 deletions
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15
gcc/d/d-builtins.cc
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@ -1204,5 +1204,20 @@ d_builtin_function (tree decl)
return decl;
}
/* Same as d_builtin_function, but used to delay putting in back-end builtin
functions until the ISA that defines the builtin has been declared.
However in D, there is no global namespace. All builtins get pushed into the
`gcc.builtins' module, which is constructed during the semantic analysis
pass, which has already finished by the time target attributes are evaluated.
So builtins are not pushed because they would be ultimately ignored.
The purpose of having this function then is to improve compile-time
reflection support to allow user-code to determine whether a given back end
function is enabled by the ISA. */
tree
d_builtin_function_ext_scope (tree decl)
{
return decl;
}
#include "gt-d-d-builtins.h"

2
gcc/d/d-lang.cc
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@ -1745,6 +1745,7 @@ d_enum_underlying_base_type (const_tree type)
#undef LANG_HOOKS_GET_ALIAS_SET
#undef LANG_HOOKS_TYPES_COMPATIBLE_P
#undef LANG_HOOKS_BUILTIN_FUNCTION
#undef LANG_HOOKS_BUILTIN_FUNCTION_EXT_SCOPE
#undef LANG_HOOKS_REGISTER_BUILTIN_TYPE
#undef LANG_HOOKS_FINISH_INCOMPLETE_DECL
#undef LANG_HOOKS_GIMPLIFY_EXPR
@ -1776,6 +1777,7 @@ d_enum_underlying_base_type (const_tree type)
#define LANG_HOOKS_GET_ALIAS_SET d_get_alias_set
#define LANG_HOOKS_TYPES_COMPATIBLE_P d_types_compatible_p
#define LANG_HOOKS_BUILTIN_FUNCTION d_builtin_function
#define LANG_HOOKS_BUILTIN_FUNCTION_EXT_SCOPE d_builtin_function_ext_scope
#define LANG_HOOKS_REGISTER_BUILTIN_TYPE d_register_builtin_type
#define LANG_HOOKS_FINISH_INCOMPLETE_DECL d_finish_incomplete_decl
#define LANG_HOOKS_GIMPLIFY_EXPR d_gimplify_expr

1
gcc/d/d-tree.h
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@ -502,6 +502,7 @@ extern const attribute_spec d_langhook_common_attribute_table[];
extern Type *build_frontend_type (tree);
extern tree d_builtin_function (tree);
extern tree d_builtin_function_ext_scope (tree);
extern void d_init_builtins (void);
extern void d_register_builtin_type (tree, const char *);
extern void d_build_builtins_module (Module *);

8
gcc/testsuite/gdc.dg/pr101127a.d Normal file
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@ -0,0 +1,8 @@
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101127
// { dg-do compile { target i?86*-*-* x86_64-*-* } }
// { dg-additional-options "-mavx" }
import gcc.builtins;
static assert(__traits(compiles, __builtin_ia32_andps256));
static assert(__traits(compiles, __builtin_ia32_pmulhrsw128));

7
gcc/testsuite/gdc.dg/pr101127b.d Normal file
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@ -0,0 +1,7 @@
// https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101127
// { dg-do compile { target i?86*-*-* x86_64-*-* } }
import gcc.builtins;
static assert(!__traits(compiles, __builtin_ia32_andps256));
static assert(!__traits(compiles, __builtin_ia32_pmulhrsw128));