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This fixes displaying 64-bit addresses in readelf and also fixes
showing backtraces from core dumps on x86_64.
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This makes it unnecessary to track the symbol size which just isn't
available for unexported symbols (e.g. for 'static __thread').
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By constraining two implementations, the compiler will select the best
fitting one. All this will require is duplicating the implementation and
simplifying for the `void` case.
This constraining also informs both the caller and compiler by passing
the callback parameter types as part of the constraint
(e.g.: `IterationFunction<int>`).
Some `for_each` functions in LibELF only take functions which return
`void`. This is a minimal correctness check, as it removes one way for a
function to incompletely do something.
There seems to be a possible idiom where inside a lambda, a `return;` is
the same as `continue;` in a for-loop.
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This changes the TLS offset calculation logic to be based on the
symbol's size instead of the total size of the TLS.
Because of this change, we no longer need to pipe "m_tls_size" to so
many functions.
Also, After this patch, the TLS data of the main program exists at the
"end" of the TLS block (Highest addresses).
This fixes a part of #6609.
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This implements more of the dlfcn functionality. Most notably:
* It's now possible to dlopen() libraries which were already
loaded at program startup time. This does not cause those
libraries to be loaded twice.
* Errors are reported via dlerror() rather than by crashing
the program.
* Calls to the dl*() functions are thread-safe.
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SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
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This helper is used by libgcc_s to figure out where the .eh_frame sections
are located for all loaded shared objects.
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This was high up in profiles and gets almost entirely optimized out
when inlined, so let's do that.
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It's a lot faster to iterate the GNU hash tables if we don't have to
compute the length of every symbol name before rejecting it anyway while
comparing the first character. :^)
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We have two kinds of lookup, SYSV and GNU hash. Both are ELF lookups.
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When performing a global symbol lookup, we were recomputing the symbol
hashes once for every dynamic object searched. The hash function was
at the very top of a profile (15%) of program startup.
With this change, the hash function is no longer visible among the top
stacks in the profile. :^)
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Also simplify it by removing an unreachable code path.
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Let's use a stronger type than void* for this since we're talking
specifically about a virtual address and not necessarily a pointer
to something actually in memory (yet).
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We no longer need the create_undefined() helper function.
Also we don't need a member field for is_undefined().
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It was very confusing how these functions used the "undefined" state
of Symbol to signal lookup failure. Let's use Optional<T> to make things
a bit more understandable.
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Remove a bunch of unused code, unnecessary const, and make some
non-object-specific member functions static.
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There's no reason to use C strings more than absolutely necessary.
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Instead of storing a "found" state inside the result object.
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This was refactored in 3e815ad, leaving this unused member behind.
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