On Wed, 22 Jul 2026 01:35:56 GMT, Yasumasa Suenaga <[email protected]> wrote:
> In PR #31669 for [JDK-8386593](https://bugs.openjdk.org/browse/JDK-8386593), > we discoverd `DW_CFA_offset_extended` and `DW_CFA_restore_extended` are not > supported in SA. > > GCC on Fedora 44 and Ubuntu 26.04 (at least) generates DWARF instructions in > below: > > > DW_CFA_offset_extended: r79 (v15) at cfa-16 > DW_CFA_advance_loc: 204 to 00000000006646e4 > DW_CFA_restore: r30 (x30) > DW_CFA_restore: r29 (x29) > DW_CFA_restore: r19 (x19) > DW_CFA_restore: r20 (x20) > DW_CFA_restore_extended: r79 (v15) > > > We need to add `DW_CFA_offset_extended` and `DW_CFA_restore_extended`, and > vector registers for AArch64 which are defined in [DWARF for the Arm® 64-bit > Architecture > (AArch64)](https://github.com/ARM-software/abi-aa/blob/2025Q4/aadwarf64/aadwarf64.rst#dwarf-register-names). > > --------- > - [x] I confirm that I make this contribution in accordance with the [OpenJDK > Interim AI Policy](https://openjdk.org/legal/ai). Ok, but the need for them in the java code is not obvious since they are not referenced from java (and neither are almost all the R registers). There should be a comment saying that these static fields are fetched by the DWARF_REG macro in DwarfParser.cpp. It's also unclear why the register numbers passed to DWARF_REG don't match those in the java file: DWARF_REG(V0, 64) \ public static final int V0 = 34; ------------- PR Comment: https://git.openjdk.org/jdk/pull/31999#issuecomment-5123707056
