[GR-66195] Debug info for shared library missed info for variables (linux, aarch64)

[minamoto79]

Describe the Issue

1. follow build instructions from example https://github.com/graalvm/graalvm-demos/blob/master/native-image/build-shared-library/README.md
2. but add -g to native-image to generate debug info
3. execute dwarfdamp: dwarfdump -i graalvm-demos/native-shared-library/libenvmap.so.debug | less +/\"filterEnv\"

Actual result is:

0x00000c2c:     DW_TAG_subprogram
                  DW_AT_external        (0x01)
                  DW_AT_name    ("filterEnv")
                  DW_AT_linkage_name    ("_ZN9LibEnvMap9filterEnvEJi37org.graalvm.nativeimage.IsolateThread43org.graalvm.nativeimage.c.type.CCharPointer")
                  DW_AT_type    (0x219ae612287b7531)
                  DW_AT_artificial      (0x00)
                  DW_AT_accessibility   (DW_ACCESS_private)
                  DW_AT_declaration     (0x01)

0x00000c41:       DW_TAG_formal_parameter
                    DW_AT_type  (0xab1c3ea4b91a5af3)

0x00000c4a:       DW_TAG_formal_parameter
                    DW_AT_type  (0xf4746327f17324ed)

0x00000c53:       NULL

0x00000c54:     NULL

Expected result is: DW_TAG_variable entries for filter, env and others

Using the latest version of GraalVM can resolve many issues.

• I tried with the latest version of GraalVM.

GraalVM Version

openjdk 24 2025-03-18
OpenJDK Runtime Environment GraalVM CE 24+36.1 (build 24+36-jvmci-b01)
OpenJDK 64-Bit Server VM GraalVM CE 24+36.1 (build 24+36-jvmci-b01, mixed mode, sharing)

Operating System and Version

Linux 531ed515bb73 6.10.14-linuxkit #1 SMP Sat May 17 08:28:57 UTC 2025 aarch64 aarch64 aarch64 GNU/Linux

Build Command

native-image -o libenvmap --shared -g -cp .

Expected Behavior

dwarfdump -i graalvm-demos/native-shared-library/libenvmap.so.debug | less +/\"filterEnv\"
DW_TAG_variable entries for filter, env and others

Actual Behavior

dwarfdump -i graalvm-demos/native-shared-library/libenvmap.so.debug | less +/\"filterEnv\"

Actual result is:

0x00000c2c:     DW_TAG_subprogram
                  DW_AT_external        (0x01)
                  DW_AT_name    ("filterEnv")
                  DW_AT_linkage_name    ("_ZN9LibEnvMap9filterEnvEJi37org.graalvm.nativeimage.IsolateThread43org.graalvm.nativeimage.c.type.CCharPointer")
                  DW_AT_type    (0x219ae612287b7531)
                  DW_AT_artificial      (0x00)
                  DW_AT_accessibility   (DW_ACCESS_private)
                  DW_AT_declaration     (0x01)

0x00000c41:       DW_TAG_formal_parameter
                    DW_AT_type  (0xab1c3ea4b91a5af3)

0x00000c4a:       DW_TAG_formal_parameter
                    DW_AT_type  (0xf4746327f17324ed)

0x00000c53:       NULL

0x00000c54:     NULL

Steps to Reproduce

1. follow instructions from https://github.com/graalvm/graalvm-demos/blob/master/native-image/build-shared-library/README.md, but add -g for native-image

Additional Context

No response

Build Log Output and Error Messages

No response

[fniephaus]

Thanks for the ticket, @minamoto79. Any idea what could be causing this, @adinn?

[adinn]

Thanks for the ticket, @minamoto79. Any idea what could be causing this, @adinn?

@fniephaus I'll take a look and get back to you asap.

[adinn]

@minamoto79

Before looking into the error you are seeing I tried to reproduce the symptoms described above with GraalVM head and labsjdk-ce-26+1-jvmci-b01-linux-aarch64. I got a somewhat different result. The dwarf info for the shared library contained no mention of entry point method filterEnv and no mention of the owner class LibEnvMap.

I debugged dwarf info generation and confirmed that this is not because of an issue in the debug info generator. The relevant class and associated method are not presented to the debugger for inclusion in the debug output. To be more specific - The list of types returned when the DebugInfoProvider calls call to HostedUniverse.getTypes() does not include a class named "LibEnvMap". Likewise the list of methods returned when the DebugInfoProvider calls call to HostedUniverse.getMethods() does not include a method whose name includes "filterEnv" (not on any class).

I'm not sure this outcome represents any change from the status quo. I have generated debug info for a shared library before but I don't remember the entry points and their associated class being included in the resulting info. Perhaps @olpaw can comment on whether this is normal or not?

I also don't understand why you are seeing the method mentioned in the debug info output from your JDK24 build (are you also seeing info for the associated class). If you or @olpaw could advise on how to obtain jdk24 graal source tree and associated labsjdk image I'd be happy to try reproducing the problem and debugging it.

[adinn]

@minamoto79 I switched my source tree to tag release/graal-vm/24.2 and tried building using labsjdk release 24+36-jvmci-b0. I was able to run mx build with this release but any attempt to run mx native-image failed because of a JVMCI mismatch (even when I set and exported JVMCI_VERSION_CHECK=ignore -- recursive builds failed).

I was able to build release/graal-vm/24.2 using labsjdk release 24.0.1+9-jvmci-b0. However, this displayed the same behaviour as the jdk26 code i.e. type LibEnvMap and method filterEnv were missing from the (respective) types and methods lists attached to the HostedUniverse.

@olpaw If you can work out how to reproduce this I'll be happy to help diagnose. Otherwise I don't think I can do any more to help.

[minamoto79]

@adinn in my debug info I see entry for class too:

0x00000c18:   DW_TAG_class_type
                DW_AT_name      ("LibEnvMap")
                DW_AT_byte_size (0x0010)
                DW_AT_decl_file (0x0001)

0x00000c21:     DW_TAG_inheritance
                  DW_AT_type    (0x0675f9f96109e8e1)
                  DW_AT_data_member_location    (0x00)
                  DW_AT_accessibility   (DW_ACCESS_public)

0x00000c2c:     DW_TAG_subprogram
                  DW_AT_external        (0x01)
                  DW_AT_name    ("filterEnv")
                  DW_AT_linkage_name    ("_ZN9LibEnvMap9filterEnvEJi37org.graalvm.nativeimage.IsolateThread43org.graalvm.nativeimage.c.type.CCharPointer")
                  DW_AT_type    (0x219ae612287b7531)
                  DW_AT_artificial      (0x00)
                  DW_AT_accessibility   (DW_ACCESS_private)
                  DW_AT_declaration     (0x01)

0x00000c41:       DW_TAG_formal_parameter
                    DW_AT_type  (0xab1c3ea4b91a5af3)

0x00000c4a:       DW_TAG_formal_parameter
                    DW_AT_type  (0xf4746327f17324ed)

0x00000c53:       NULL

0x00000c54:     NULL

0x00000c55:   NULL

and this tag value looks corrupted:

0x00000c21:     DW_TAG_inheritance
                  DW_AT_type    (0x0675f9f96109e8e1) <--
                  DW_AT_data_member_location    (0x00)
                  DW_AT_accessibility   (DW_ACCESS_public)

I suppose DW_AT_type should be 0x3d4:

0x000003d4:   DW_TAG_class_type
                DW_AT_name      ("java.lang.Object")
                DW_AT_declaration       (0x01)
                DW_AT_signature (0x0675f9f96109e8e1)