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debug: Add BTF_WITH_CORE_DEBUG debug format 

To best handle BTF/CO-RE in GCC, a distinct BTF_WITH_CORE_DEBUG debug format is
being added.  This helps the compiler detect whether BTF with CO-RE relocations
needs to be emitted.

gcc/ChangeLog:

	* flag-types.h (enum debug_info_type): Add new enum
	DINFO_TYPE_BTF_WITH_CORE.
	(BTF_WITH_CORE_DEBUG): New bitmask.
	* flags.h (btf_with_core_debuginfo_p): New declaration.
	* opts.c (btf_with_core_debuginfo_p): New definition.
This commit is contained in:
Indu Bhagat 2021-09-07 11:16:53 -07:00
parent c03db573b9
commit 053db9a49b
3 changed files with 17 additions and 1 deletions
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6
gcc/flag-types.h
View File

@ -31,7 +31,8 @@ enum debug_info_type
DINFO_TYPE_VMS = 4, /* VMS debug info. */
DINFO_TYPE_CTF = 5, /* CTF debug info. */
DINFO_TYPE_BTF = 6, /* BTF debug info. */
DINFO_TYPE_MAX = DINFO_TYPE_BTF /* Marker only. */
DINFO_TYPE_BTF_WITH_CORE = 7, /* BTF debug info with CO-RE relocations. */
DINFO_TYPE_MAX = DINFO_TYPE_BTF_WITH_CORE /* Marker only. */
};
#define NO_DEBUG (0U)
@ -47,6 +48,9 @@ enum debug_info_type
#define CTF_DEBUG (1U << DINFO_TYPE_CTF)
/* Write BTF debug info (using btfout.c). */
#define BTF_DEBUG (1U << DINFO_TYPE_BTF)
/* Write BTF debug info for BPF CO-RE usecase (using btfout.c). */
#define BTF_WITH_CORE_DEBUG (1U << DINFO_TYPE_BTF_WITH_CORE)
/* Note: Adding new definitions to handle -combination- of debug formats,
like VMS_AND_DWARF2_DEBUG is not recommended. This definition remains
here for historical reasons. */

4
gcc/flags.h
View File

@ -44,6 +44,10 @@ const char * debug_set_names (uint32_t w_symbols);
extern bool btf_debuginfo_p ();
/* Return true iff BTF with CO-RE debug info is enabled. */
extern bool btf_with_core_debuginfo_p ();
/* Return true iff CTF debug info is enabled. */
extern bool ctf_debuginfo_p ();

8
gcc/opts.c
View File

@ -135,6 +135,14 @@ btf_debuginfo_p ()
return (write_symbols & BTF_DEBUG);
}
/* Return TRUE iff BTF with CO-RE debug info is enabled. */
bool
btf_with_core_debuginfo_p ()
{
return (write_symbols & BTF_WITH_CORE_DEBUG);
}
/* Return TRUE iff CTF debug info is enabled. */
bool