pkg/proc: update riscv64 support and fix several tests

[lrzlin]

This pull request adds support for stack-switching functions, contextregnum and sigtramp on riscv64, which fix TestCgoStacktrace, TestCgoStacktrace2, TestStepIntoCoroutine, TestCapturedVarVisibleOnFirstLine and TestDWZCompression.

[aarzilli]

The tests on linux/riscv64 aren't passing because there is no capslock file. Do you mind generating it with

capslock -goos linux -goarch riscv64 -packages ./cmd/dlv > _scripts/capslock_linux_riscv64-output.txt

Also, while we are at this, the linux/riscv64/tip fails due to a timeout compiling go-tip. I think we should just remove it from the test matrix (we don't test tip on linux/386 and linux/pcc64le either).

[lrzlin]

The tests on linux/riscv64 aren't passing because there is no capslock file. Do you mind generating it with

capslock -goos linux -goarch riscv64 -packages ./cmd/dlv > _scripts/capslock_linux_riscv64-output.txt

Added, BTW I have to add GOFLAGS="-tags=exp.linuxriscv64" to generate this, is that okay?

Also, while we are at this, the linux/riscv64/tip fails due to a timeout compiling go-tip. I think we should just remove it from the test matrix (we don't test tip on linux/386 and linux/pcc64le either).

Removed, also I'm wondering with CI machine and renewed support, could we start discussing remove the experimental mark of riscv64 support?

[aarzilli]

Added, BTW I have to add GOFLAGS="-tags=exp.linuxriscv64" to generate this, is that okay?

Yes. You also need to add it to TestCapsLock, the same as the if statement for linux/ppc64le.

Removed, also I'm wondering with CI machine and renewed support, could we start discussing remove the experimental mark of riscv64 support?

Yes.

[lrzlin]

Added, BTW I have to add GOFLAGS="-tags=exp.linuxriscv64" to generate this, is that okay?

Yes. You also need to add it to TestCapsLock, the same as the if statement for linux/ppc64le.

Added, thanks for the guide.

[aarzilli]

LGTM

[derekparker]

Re-running CI due to all the failures.

[derekparker]

I think you may need to update the capslock file. Can you run go run _scripts/gen-capslock-all.go?

[lrzlin]

I think you may need to update the capslock file. Can you run go run _scripts/gen-capslock-all.go?

I've run go run _scripts/gen-capslock-all.go again but there are not any difference with the version I updated.

[lrzlin]

I think you may need to update the capslock file. Can you run go run _scripts/gen-capslock-all.go?

Sorry, after updated the capslock version, I've found it generated correctly, also remove the experimental mark.

Besides, I've checked with @mengzhuo that the riscv64 ci machine is up-and-running normally, so I've re-added riscv64 in testing matrix, if there are any issues with delve CI machine, we'll try to solve it ASAP.

[derekparker]

LGTM