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I noticed that clang produces DIFiles that look like DIFile(filename: "src/test.c", directory: "/path/to/pwd") at first I thought this must be a bug, but this could also be a space-saving optimization to unique the redundant $PWD prefix of all paths. Is this a bug or a feature? -- adrian

...ce- > > saving optimization to unique the redundant $PWD prefix of all paths. > > > > Is this a bug or a feature? > > Based on extremely quick experiments, I think it's simple-minded and > not purposely factoring out common prefixes; directories are just PWD > and -Ifoo, and filenames are the rest of the path, whether it comes > from the command line or an #include directive. > > Interestingly, I get different .debug_line sections depending on > compiling straight to object versus compiling to assembler and then > assembling. When we compile to obj...

Unlike full virtualization in which the virtual machine provides the same platform interface as running natively on the hardware, paravirtualization requires modification to the guest operating system to work with the platform interface provided by the hypervisor. Xen was designed with performance in mind. Calls to the hypervisor are minimized, batched if necessary, and non-critical codepaths