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From: Alexandre Oliva <aoliva@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r12-3554] zero-call-used-regs attr for ada Date: Wed, 15 Sep 2021 16:30:00 +0000 (GMT) [thread overview] Message-ID: <20210915163000.2548E3858422@sourceware.org> (raw) https://gcc.gnu.org/g:2709337c1181510e3d4f74e86bf75aa83f7b18aa commit r12-3554-g2709337c1181510e3d4f74e86bf75aa83f7b18aa Author: Alexandre Oliva <oliva@adacore.com> Date: Wed Sep 15 13:04:54 2021 -0300 zero-call-used-regs attr for ada Make the zero_call_used_regs attribute usable as a Machine_Attribute pragma. for gcc/ada/ChangeLog * gcc-interface/utils.c: Include opts.h. (handle_zero_call_used_regs_attribute): New. (gnat_internal_attribute_table): Add zero_call_used_regs. for gcc/testsuite/ChangeLog * gnat.dg/zcur_attr.adb, gnat.dg/zcur_attr.ads: New. Diff: --- gcc/ada/gcc-interface/utils.c | 59 +++++++++++++++++++++++++++++++++++++ gcc/testsuite/gnat.dg/zcur_attr.adb | 8 +++++ gcc/testsuite/gnat.dg/zcur_attr.ads | 4 +++ 3 files changed, 71 insertions(+) diff --git a/gcc/ada/gcc-interface/utils.c b/gcc/ada/gcc-interface/utils.c index 4190855b763..be3f107926d 100644 --- a/gcc/ada/gcc-interface/utils.c +++ b/gcc/ada/gcc-interface/utils.c @@ -38,6 +38,7 @@ #include "attribs.h" #include "varasm.h" #include "toplev.h" +#include "opts.h" #include "output.h" #include "debug.h" #include "convert.h" @@ -109,6 +110,8 @@ static tree handle_target_attribute (tree *, tree, tree, int, bool *); static tree handle_target_clones_attribute (tree *, tree, tree, int, bool *); static tree handle_vector_size_attribute (tree *, tree, tree, int, bool *); static tree handle_vector_type_attribute (tree *, tree, tree, int, bool *); +static tree handle_zero_call_used_regs_attribute (tree *, tree, tree, int, + bool *); static const struct attribute_spec::exclusions attr_cold_hot_exclusions[] = { @@ -191,6 +194,9 @@ const struct attribute_spec gnat_internal_attribute_table[] = { "may_alias", 0, 0, false, true, false, false, NULL, NULL }, + { "zero_call_used_regs", 1, 1, true, false, false, false, + handle_zero_call_used_regs_attribute, NULL }, + /* ??? format and format_arg are heavy and not supported, which actually prevents support for stdio builtins, which we however declare as part of the common builtins.def contents. */ @@ -6987,6 +6993,59 @@ handle_vector_type_attribute (tree *node, tree name, tree ARG_UNUSED (args), return NULL_TREE; } +/* Handle a "zero_call_used_regs" attribute; arguments as in + struct attribute_spec.handler. */ + +static tree +handle_zero_call_used_regs_attribute (tree *node, tree name, tree args, + int ARG_UNUSED (flags), + bool *no_add_attrs) +{ + tree decl = *node; + tree id = TREE_VALUE (args); + + if (TREE_CODE (decl) != FUNCTION_DECL) + { + error_at (DECL_SOURCE_LOCATION (decl), + "%qE attribute applies only to functions", name); + *no_add_attrs = true; + return NULL_TREE; + } + + /* pragma Machine_Attribute turns string arguments into identifiers. + Reverse it. */ + if (TREE_CODE (id) == IDENTIFIER_NODE) + id = TREE_VALUE (args) = build_string + (IDENTIFIER_LENGTH (id), IDENTIFIER_POINTER (id)); + + if (TREE_CODE (id) != STRING_CST) + { + error_at (DECL_SOURCE_LOCATION (decl), + "%qE argument not a string", name); + *no_add_attrs = true; + return NULL_TREE; + } + + bool found = false; + for (unsigned int i = 0; zero_call_used_regs_opts[i].name != NULL; ++i) + if (strcmp (TREE_STRING_POINTER (id), + zero_call_used_regs_opts[i].name) == 0) + { + found = true; + break; + } + + if (!found) + { + error_at (DECL_SOURCE_LOCATION (decl), + "unrecognized %qE attribute argument %qs", + name, TREE_STRING_POINTER (id)); + *no_add_attrs = true; + } + + return NULL_TREE; +} + /* ----------------------------------------------------------------------- * * BUILTIN FUNCTIONS * * ----------------------------------------------------------------------- */ diff --git a/gcc/testsuite/gnat.dg/zcur_attr.adb b/gcc/testsuite/gnat.dg/zcur_attr.adb new file mode 100644 index 00000000000..5d15f5e9d73 --- /dev/null +++ b/gcc/testsuite/gnat.dg/zcur_attr.adb @@ -0,0 +1,8 @@ +-- { dg-do compile } +-- { dg-options "-fdump-tree-optimized" } + +package body ZCUR_Attr is + function F return Integer is (0); +end ZCUR_Attr; + +-- { dg-final { scan-tree-dump "zero_call_used_regs \[(\]\"all\"\[)\]" "optimized" } } diff --git a/gcc/testsuite/gnat.dg/zcur_attr.ads b/gcc/testsuite/gnat.dg/zcur_attr.ads new file mode 100644 index 00000000000..b756cc838b8 --- /dev/null +++ b/gcc/testsuite/gnat.dg/zcur_attr.ads @@ -0,0 +1,4 @@ +package ZCUR_Attr is + function F return Integer; + pragma Machine_Attribute (F, "zero_call_used_regs", "all"); +end ZCUR_Attr;
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