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| author | David Faust <david.faust@oracle.com> | 2022-12-07 11:44:28 -0800 |
|---|---|---|
| committer | David Faust <david.faust@oracle.com> | 2022-12-14 10:20:52 -0800 |
| commit | 2bce22e88e1c8486a0f2d42311506a8d3da20fb7 (patch) | |
| tree | 911e7df680b0a6f1ea5ccd4ecfe80cf1ea5a3efa /include | |
| parent | 0e9495303db062cf118869b7526132b5821833e9 (diff) | |
| download | gcc-2bce22e88e1c8486a0f2d42311506a8d3da20fb7.tar.gz | |
btf: add 'extern' linkage for variables [PR106773]
Add support for the 'extern' linkage value for BTF_KIND_VAR records,
which is used for variables declared as extern in the source file.
This also fixes a bug with BTF generation for extern variables which
have both a non-defining declaration and a defining declaration in the
same CU.
PR target/106773
gcc/
* btfout.cc (btf_collect_datasec): Mark extern variables as such.
(btf_dvd_emit_preprocess_cb): Skip non-defining extern variable decl
if there is a defining decl for the same variable.
(btf_asm_varent): Accomodate 'extern' linkage.
gcc/testsuite/
* gcc.dg/debug/btf/btf-variables-4.c: New test.
* gcc.dg/debug/btf/btf-variables-5.c: New test.
include/
* btf.h (enum btf_var_linkage): New.
(struct btf_var): Update comment to note 'extern' linkage.
Diffstat (limited to 'include')
| -rw-r--r-- | include/btf.h | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/include/btf.h b/include/btf.h index eba67f9d599..da621353aa1 100644 --- a/include/btf.h +++ b/include/btf.h @@ -178,11 +178,20 @@ struct btf_param uint32_t type; /* Type of parameter. */ }; +/* BTF_KIND_VAR records encode linkage information in a single + trailing struct btf_var. These are the supported values. */ +enum btf_var_linkage +{ + BTF_VAR_STATIC = 0, + BTF_VAR_GLOBAL_ALLOCATED = 1, + BTF_VAR_GLOBAL_EXTERN = 2, +}; + /* BTF_KIND_VAR is followed by a single struct btf_var, which describes information about the variable. */ struct btf_var { - uint32_t linkage; /* Currently only 0=static or 1=global. */ + uint32_t linkage; /* 0=static, 1=global, 2=extern. */ }; /* BTF_KIND_DATASEC is followed by VLEN struct btf_var_secinfo entries, |