btf: Add support to BTF_KIND_ENUM64 type
BTF supports 64-bits enumerators with following encoding:
struct btf_type:
name_off: 0 or offset to a valid C identifier
info.kind_flag: 0 for unsigned, 1 for signed
info.kind: BTF_KIND_ENUM64
info.vlen: number of enum values
size: 1/2/4/8
The btf_type is followed by info.vlen number of:
struct btf_enum64
{
uint32_t name_off; /* Offset in string section of enumerator name. */
uint32_t val_lo32; /* lower 32-bit value for a 64-bit value Enumerator */
uint32_t val_hi32; /* high 32-bit value for a 64-bit value Enumerator */
};
So, a new btf_enum64 structure was added to represent BTF_KIND_ENUM64
and a new field dtd_enum_unsigned in ctf_dtdef structure to distinguish
when CTF enum is a signed or unsigned type, later that information is
used to encode the BTF enum type.
gcc/ChangeLog:
* btfout.cc (btf_calc_num_vbytes): Compute enumeration size depending of
enumerator type btf_enum{,64}.
(btf_asm_type): Update btf_kflag according to enumeration type sign
using dtd_enum_unsigned field for both: BTF_KIND_ENUM{,64}.
(btf_asm_enum_const): New argument to represent the size of
the BTF enum type, writing the enumerator constant value for
32 bits, if it's 64 bits then explicitly writes lower 32-bits
value and higher 32-bits value.
(output_asm_btf_enum_list): Add enumeration size argument.
* ctfc.cc (ctf_add_enum): New argument to represent CTF enum
basic information.
(ctf_add_generic): Use of ei_{name. size, unsigned} to build the
dtd structure containing enumeration information.
(ctf_add_enumerator): Update comment mention support for BTF
enumeration in 64-bits.
* dwarf2ctf.cc (gen_ctf_enumeration_type): Extract signedness
for enumeration type and use it in ctf_add_enum.
* ctfc.h (ctf_dmdef): Update dmd_value to HOST_WIDE_INT to allow
use 32/64 bits enumerators.
information.
(ctf_dtdef): New field to describe enum signedness.
include/
* btf.h (btf_enum64): Add new definition and new symbolic
constant to BTF_KIND_ENUM64 and BTF_KF_ENUM_{UN,}SIGNED.
gcc/testsuite/ChangeLog:
* gcc.dg/debug/btf/btf-enum-1.c: Update testcase, with correct
info.kflags encoding.
* gcc.dg/debug/btf/btf-enum64-1.c: New testcase.
This commit is contained in:
Guillermo E. Martinez
Indu Bhagat
parent
cbf56503d5
commit
8422861bdd
7 changed files with 100 additions and 18 deletions
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@ -223,7 +223,9 @@ btf_calc_num_vbytes (ctf_dtdef_ref dtd)
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break;
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case BTF_KIND_ENUM:
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vlen_bytes += vlen * sizeof (struct btf_enum);
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vlen_bytes += (dtd->dtd_data.ctti_size == 0x8)
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? vlen * sizeof (struct btf_enum64)
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: vlen * sizeof (struct btf_enum);
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break;
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case BTF_KIND_FUNC_PROTO:
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@ -622,6 +624,15 @@ btf_asm_type (ctf_container_ref ctfc, ctf_dtdef_ref dtd)
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btf_size_type = 0;
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}
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if (btf_kind == BTF_KIND_ENUM)
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{
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btf_kflag = dtd->dtd_enum_unsigned
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? BTF_KF_ENUM_UNSIGNED
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: BTF_KF_ENUM_SIGNED;
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if (dtd->dtd_data.ctti_size == 0x8)
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btf_kind = BTF_KIND_ENUM64;
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}
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dw2_asm_output_data (4, dtd->dtd_data.ctti_name, "btt_name");
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dw2_asm_output_data (4, BTF_TYPE_INFO (btf_kind, btf_kflag, btf_vlen),
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"btt_info: kind=%u, kflag=%u, vlen=%u",
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@ -634,6 +645,7 @@ btf_asm_type (ctf_container_ref ctfc, ctf_dtdef_ref dtd)
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case BTF_KIND_UNION:
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case BTF_KIND_ENUM:
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case BTF_KIND_DATASEC:
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case BTF_KIND_ENUM64:
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dw2_asm_output_data (4, dtd->dtd_data.ctti_size, "btt_size: %uB",
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dtd->dtd_data.ctti_size);
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return;
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@ -707,13 +719,19 @@ btf_asm_sou_member (ctf_container_ref ctfc, ctf_dmdef_t * dmd)
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}
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}
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/* Asm'out an enum constant following a BTF_KIND_ENUM. */
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/* Asm'out an enum constant following a BTF_KIND_ENUM{,64}. */
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static void
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btf_asm_enum_const (ctf_dmdef_t * dmd)
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btf_asm_enum_const (unsigned int size, ctf_dmdef_t * dmd)
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{
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dw2_asm_output_data (4, dmd->dmd_name_offset, "bte_name");
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dw2_asm_output_data (4, dmd->dmd_value, "bte_value");
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if (size == 4)
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dw2_asm_output_data (size, dmd->dmd_value, "bte_value");
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else
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{
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dw2_asm_output_data (4, dmd->dmd_value & 0xffffffff, "bte_value_lo32");
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dw2_asm_output_data (4, (dmd->dmd_value >> 32) & 0xffffffff, "bte_value_hi32");
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}
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}
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/* Asm'out a function parameter description following a BTF_KIND_FUNC_PROTO. */
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@ -871,7 +889,7 @@ output_asm_btf_sou_fields (ctf_container_ref ctfc, ctf_dtdef_ref dtd)
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btf_asm_sou_member (ctfc, dmd);
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}
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/* Output all enumerator constants following a BTF_KIND_ENUM. */
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/* Output all enumerator constants following a BTF_KIND_ENUM{,64}. */
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static void
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output_asm_btf_enum_list (ctf_container_ref ARG_UNUSED (ctfc),
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@ -881,7 +899,7 @@ output_asm_btf_enum_list (ctf_container_ref ARG_UNUSED (ctfc),
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for (dmd = dtd->dtd_u.dtu_members;
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dmd != NULL; dmd = (ctf_dmdef_t *) ctf_dmd_list_next (dmd))
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btf_asm_enum_const (dmd);
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btf_asm_enum_const (dtd->dtd_data.ctti_size, dmd);
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}
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/* Output all function arguments following a BTF_KIND_FUNC_PROTO. */
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13
gcc/ctfc.cc
13
gcc/ctfc.cc
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@ -577,7 +577,7 @@ ctf_add_array (ctf_container_ref ctfc, uint32_t flag, const ctf_arinfo_t * arp,
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ctf_id_t
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ctf_add_enum (ctf_container_ref ctfc, uint32_t flag, const char * name,
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HOST_WIDE_INT size, dw_die_ref die)
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HOST_WIDE_INT size, bool eunsigned, dw_die_ref die)
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{
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ctf_dtdef_ref dtd;
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ctf_id_t type;
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@ -604,6 +604,7 @@ ctf_add_enum (ctf_container_ref ctfc, uint32_t flag, const char * name,
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gcc_assert (size <= CTF_MAX_SIZE);
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dtd->dtd_data.ctti_size = size;
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dtd->dtd_enum_unsigned = eunsigned;
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ctfc->ctfc_num_stypes++;
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@ -630,10 +631,12 @@ ctf_add_enumerator (ctf_container_ref ctfc, ctf_id_t enid, const char * name,
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gcc_assert (kind == CTF_K_ENUM && vlen < CTF_MAX_VLEN);
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/* Enum value is of type HOST_WIDE_INT in the compiler, dmd_value is int32_t
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on the other hand. Check bounds and skip adding this enum value if out of
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bounds. */
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if ((value > INT_MAX) || (value < INT_MIN))
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/* Enum value is of type HOST_WIDE_INT in the compiler, CTF enumerators
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values in ctf_enum_t is limited to int32_t, BTF supports signed and
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unsigned enumerators values of 32 and 64 bits, for both debug formats
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we use ctf_dmdef_t.dmd_value entry of HOST_WIDE_INT type. So check
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CTF bounds and skip adding this enum value if out of bounds. */
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if (!btf_debuginfo_p() && ((value > INT_MAX) || (value < INT_MIN)))
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{
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/* FIXME - Note this TBD_CTF_REPRESENTATION_LIMIT. */
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return (1);
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@ -133,7 +133,7 @@ typedef struct GTY ((chain_next ("%h.dmd_next"))) ctf_dmdef
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ctf_id_t dmd_type; /* Type of this member (for sou). */
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uint32_t dmd_name_offset; /* Offset of the name in str table. */
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uint64_t dmd_offset; /* Offset of this member in bits (for sou). */
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int dmd_value; /* Value of this member (for enum). */
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HOST_WIDE_INT dmd_value; /* Value of this member (for enum). */
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struct ctf_dmdef * dmd_next; /* A list node. */
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} ctf_dmdef_t;
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@ -162,6 +162,7 @@ struct GTY ((for_user)) ctf_dtdef
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bool from_global_func; /* Whether this type was added from a global
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function. */
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uint32_t linkage; /* Used in function types. 0=local, 1=global. */
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bool dtd_enum_unsigned; /* Enum signedness. */
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union GTY ((desc ("ctf_dtu_d_union_selector (&%1)")))
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{
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/* struct, union, or enum. */
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@ -406,7 +407,7 @@ extern const char * ctf_add_string (ctf_container_ref, const char *,
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extern ctf_id_t ctf_add_reftype (ctf_container_ref, uint32_t, ctf_id_t,
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uint32_t, dw_die_ref);
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extern ctf_id_t ctf_add_enum (ctf_container_ref, uint32_t, const char *,
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HOST_WIDE_INT, dw_die_ref);
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HOST_WIDE_INT, bool, dw_die_ref);
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extern ctf_id_t ctf_add_slice (ctf_container_ref, uint32_t, ctf_id_t,
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uint32_t, uint32_t, dw_die_ref);
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extern ctf_id_t ctf_add_float (ctf_container_ref, uint32_t, const char *,
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@ -736,6 +736,7 @@ gen_ctf_enumeration_type (ctf_container_ref ctfc, dw_die_ref enumeration)
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{
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const char *enum_name = get_AT_string (enumeration, DW_AT_name);
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unsigned int bit_size = ctf_die_bitsize (enumeration);
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unsigned int signedness = get_AT_unsigned (enumeration, DW_AT_encoding);
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int declaration_p = get_AT_flag (enumeration, DW_AT_declaration);
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ctf_id_t enumeration_type_id;
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@ -759,7 +760,9 @@ gen_ctf_enumeration_type (ctf_container_ref ctfc, dw_die_ref enumeration)
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/* Generate a CTF type for the enumeration. */
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enumeration_type_id = ctf_add_enum (ctfc, CTF_ADD_ROOT,
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enum_name, bit_size / 8, enumeration);
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enum_name, bit_size / 8,
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(signedness == DW_ATE_unsigned),
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enumeration);
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/* Process the enumerators. */
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{
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@ -4,7 +4,7 @@
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/* { dg-options "-O0 -gbtf -dA" } */
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/* { dg-final { scan-assembler-times "\[\t \]0x6000004\[\t \]+\[^\n\]*btt_info" 1 } } */
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/* { dg-final { scan-assembler-times "\[\t \]0x6000003\[\t \]+\[^\n\]*btt_info" 1 } } */
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/* { dg-final { scan-assembler-times "\[\t \]0x86000003\[\t \]+\[^\n\]*btt_info" 1 } } */
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/* { dg-final { scan-assembler-times "ascii \"QAD.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
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/* { dg-final { scan-assembler-times "ascii \"QED.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
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/* { dg-final { scan-assembler-times "ascii \"QOD.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
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44
gcc/testsuite/gcc.dg/debug/btf/btf-enum64-1.c
Normal file
44
gcc/testsuite/gcc.dg/debug/btf/btf-enum64-1.c
Normal file
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@ -0,0 +1,44 @@
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/* Test BTF generation for 64 bits enums. */
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/* { dg-do compile } */
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/* { dg-options "-O0 -gbtf -dA" } */
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/* { dg-final { scan-assembler-times "\[\t \].size\[\t \]myenum1,\[\t \]8" 1 } } */
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/* { dg-final { scan-assembler-times "\[\t \].size\[\t \]myenum2,\[\t \]8" 1 } } */
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/* { dg-final { scan-assembler-times "\[\t \].size\[\t \]myenum3,\[\t \]8" 1 } } */
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/* { dg-final { scan-assembler-times "\[\t \]0x13000003\[\t \]+\[^\n\]*btt_info" 2 } } */
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/* { dg-final { scan-assembler-times "\[\t \]0x93000003\[\t \]+\[^\n\]*btt_info" 1 } } */
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/* { dg-final { scan-assembler-times "\[\t \]0xffffffaa\[\t \]+\[^\n\]*bte_value_lo32" 2 } } */
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/* { dg-final { scan-assembler-times "\[\t \]0xff\[\t \]+\[^\n\]*bte_value_hi32" 3 } } */
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/* { dg-final { scan-assembler-times "ascii \"B1.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
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/* { dg-final { scan-assembler-times "ascii \"B2.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
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/* { dg-final { scan-assembler-times "ascii \"B3.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
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/* { dg-final { scan-assembler-times "ascii \"C1.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
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/* { dg-final { scan-assembler-times "ascii \"C2.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
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/* { dg-final { scan-assembler-times "ascii \"C3.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
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/* { dg-final { scan-assembler-times "ascii \"D1.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
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/* { dg-final { scan-assembler-times "ascii \"D2.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
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/* { dg-final { scan-assembler-times "ascii \"D3.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
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/* { dg-final { scan-assembler-times "bte_value_lo32" 9 } } */
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/* { dg-final { scan-assembler-times "bte_value_hi32" 9 } } */
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enum default_enum
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{
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B1 = 0xffffffffaa,
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B2 = 0xbbbbbbbb,
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B3 = 0xaabbccdd,
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} myenum1 = B1;
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enum explicit_unsigned
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{
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C1 = 0xffffffffbbUL,
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C2 = 0xbbbbbbbb,
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C3 = 0xaabbccdd,
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} myenum2 = C1;
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enum signed64
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{
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D1 = 0xffffffffaa,
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D2 = 0xbbbbbbbb,
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D3 = -0x1,
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} myenum3 = D1;
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@ -109,7 +109,8 @@ struct btf_type
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#define BTF_KIND_VAR 14 /* Variable. */
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#define BTF_KIND_DATASEC 15 /* Section such as .bss or .data. */
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#define BTF_KIND_FLOAT 16 /* Floating point. */
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#define BTF_KIND_MAX BTF_KIND_FLOAT
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#define BTF_KIND_ENUM64 19 /* Enumeration up to 64 bits. */
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#define BTF_KIND_MAX BTF_KIND_ENUM64
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#define NR_BTF_KINDS (BTF_KIND_MAX + 1)
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/* For some BTF_KINDs, struct btf_type is immediately followed by
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@ -130,14 +131,17 @@ struct btf_type
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#define BTF_INT_BOOL (1 << 2)
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/* BTF_KIND_ENUM is followed by VLEN struct btf_enum entries,
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which describe the enumerators. Note that BTF currently only
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supports signed 32-bit enumerator values. */
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which describe the enumerators. */
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struct btf_enum
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{
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uint32_t name_off; /* Offset in string section of enumerator name. */
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int32_t val; /* Enumerator value. */
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};
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/* BTF_KF_ENUM_ holds the flags for kflags in BTF_KIND_ENUM{,64}. */
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#define BTF_KF_ENUM_UNSIGNED (0)
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#define BTF_KF_ENUM_SIGNED (1 << 0)
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/* BTF_KIND_ARRAY is followed by a single struct btf_array. */
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struct btf_array
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{
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@ -190,6 +194,15 @@ struct btf_var_secinfo
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uint32_t size; /* Size (in bytes) of variable. */
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};
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/* BTF_KIND_ENUM64 is followed by VLEN struct btf_enum64 entries,
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which describe the 64 bits enumerators. */
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struct btf_enum64
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{
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uint32_t name_off; /* Offset in string section of enumerator name. */
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uint32_t val_lo32; /* lower 32-bit value for a 64-bit value Enumerator */
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uint32_t val_hi32; /* high 32-bit value for a 64-bit value Enumerator */
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};
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#ifdef __cplusplus
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}
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#endif
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