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BTF: Support for BTF_KIND_FLOAT

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Add BTF_KIND_FLOAT, a new BTF type kind which has recently stabilized in
the linux kernel [1]. This kind is used for encoding floating point
types, and is of particular use when generating BTF for some s390
arch-specific kernel headers.

Also update some BTF tests which previously used floating point types to
check correct behavior for types with no BTF representation.

[1]: b1828f0b04

include/ChangeLog:

	* btf.h (struct btf_type): Update bit usage comment.
	(BTF_INFO_KIND): Update bit mask.
	(BTF_KIND_FLOAT): New define.
	(BTF_KIND_MAX): Update.

gcc/ChangeLog:

	* btfout.c (get_btf_kind): Support BTF_KIND_FLOAT.
	(btf_asm_type): Likewise.

gcc/testsuite/ChangeLog:

	* gcc.dg/debug/btf/btf-float-1.c: New test.
	* gcc.dg/debug/btf/btf-function-3.c: Use different unrepresentable type.
	* gcc.dg/debug/btf/btf-struct-2.c: Likewise.
	* gcc.dg/debug/btf/btf-variables-2.c: Likewise.
This commit is contained in:
David Faust 2021-06-01 09:22:59 -07:00
parent b60761baa6
commit 18d0fad77b
6 changed files with 30 additions and 7 deletions
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2
gcc/btfout.c
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@ -124,6 +124,7 @@ get_btf_kind (uint32_t ctf_kind)
switch (ctf_kind)
{
case CTF_K_INTEGER: return BTF_KIND_INT;
case CTF_K_FLOAT: return BTF_KIND_FLOAT;
case CTF_K_POINTER: return BTF_KIND_PTR;
case CTF_K_ARRAY: return BTF_KIND_ARRAY;
case CTF_K_FUNCTION: return BTF_KIND_FUNC_PROTO;
@ -627,6 +628,7 @@ btf_asm_type (ctf_container_ref ctfc, ctf_dtdef_ref dtd)
switch (btf_kind)
{
case BTF_KIND_INT:
case BTF_KIND_FLOAT:
case BTF_KIND_STRUCT:
case BTF_KIND_UNION:
case BTF_KIND_ENUM:

20
gcc/testsuite/gcc.dg/debug/btf/btf-float-1.c Normal file
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@ -0,0 +1,20 @@
/* Tests for BTF floating point type kinds. We expect a single record for each
of the base types: float, double and long double. */
/* { dg-do compile } */
/* { dg-options "-O0 -gbtf -dA" } */
/* { dg-final { scan-assembler-times "\[\t \]0x10000000\[\t \]+\[^\n\]*btt_info" 3 } } */
/* { dg-final { scan-assembler-times "ascii \"float.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
/* { dg-final { scan-assembler-times "ascii \"double.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
/* { dg-final { scan-assembler-times "ascii \"long double.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
float a;
float b = 1.5f;
double c;
double d = -99.9;
long double e;
long double f = 1000.01;

2
gcc/testsuite/gcc.dg/debug/btf/btf-function-3.c
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@ -16,7 +16,7 @@
/* Exactly one function parameter should have type_id=0. */
/* { dg-final { scan-assembler-times "\[\t \]0\[\t \]+\[^\n\]*farg_type" 1 } } */
int foo (int a, float f, long b)
int foo (int a, float __attribute__((__vector_size__(16))) f, long b)
{
return 0;
}

2
gcc/testsuite/gcc.dg/debug/btf/btf-struct-2.c
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@ -14,6 +14,6 @@
struct with_float
{
int a;
float f;
float __attribute__((__vector_size__(16))) f;
char c;
} instance;

2
gcc/testsuite/gcc.dg/debug/btf/btf-variables-2.c
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@ -16,7 +16,7 @@
/* { dg-final { scan-assembler-times "ascii \"myst.0\"\[\t \]+\[^\n\]*btf_string" 1 } } */
int foo;
float bar;
float __attribute__((__vector_size__(16))) bar;
int baz[10];
struct st

9
include/btf.h
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@ -62,8 +62,8 @@ struct btf_type
uint32_t info; /* Encoded kind, variant length, kind flag:
- bits 0-15: vlen
- bits 16-23: unused
- bits 24-27: kind
- bits 28-30: unused
- bits 24-28: kind
- bits 29-30: unused
- bit 31: kind_flag
See accessor macros below. */
@ -79,7 +79,7 @@ struct btf_type
/* The folloing macros access the information encoded in btf_type.info. */
/* Type kind. See below. */
#define BTF_INFO_KIND(info) (((info) >> 24) & 0x0f)
#define BTF_INFO_KIND(info) (((info) >> 24) & 0x1f)
/* Number of entries of variable length data following certain type kinds.
For example, number of structure members, number of function parameters. */
#define BTF_INFO_VLEN(info) ((info) & 0xffff)
@ -108,7 +108,8 @@ struct btf_type
#define BTF_KIND_FUNC_PROTO 13 /* Function Prototype. */
#define BTF_KIND_VAR 14 /* Variable. */
#define BTF_KIND_DATASEC 15 /* Section such as .bss or .data. */
#define BTF_KIND_MAX BTF_KIND_DATASEC
#define BTF_KIND_FLOAT 16 /* Floating point. */
#define BTF_KIND_MAX BTF_KIND_FLOAT
#define NR_BTF_KINDS (BTF_KIND_MAX + 1)
/* For some BTF_KINDs, struct btf_type is immediately followed by