https://sourceware.org/bugzilla/show_bug.cgi?id=31213
Bug ID: 31213
Summary: gas: add diagnostic when skipping CFI directives for
SFrame generation
Product: binutils
Version: 2.42 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: indu.bhagat at oracle dot com
Target Milestone: ---
When the user specifies --gsframe, GAS consumes the .cfi_* directives to
generate the SFrame stack trace information. Some CFI directives are skipped,
however, because they are either unnecessary or unsupported.
When it comes to unsupported directives, it is preferable to convey to user
because missed SFrame FDEs affect the coverage and hence asynchronicity of the
stack trace information in SFrame section.
One example of an unsupported directive is the .cfi_escape directive. A
.cfi_escape directive allows to encode simple or complex expressions for unwind
information (DW_CFA_def_cfa_expression, DW_CFA_expression, or
DW_CFA_val_expression etc).
It will be great to add support for .cfi_escape for SFrame generation, for at
least simple expressions to begin with. In the meantime, GAS must at least warn
and not silently skip generating SFrame FDE for unsupported directives.
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