This has the following advantages:
* Less code.
* The old ELF implementation was wrong for non-relocatable objects.
* The old ELF implementation (and I think MachO) was wrong for thumb.
No current testcase since this is only used from MCJIT and it only uses
relocatable objects and I don't think it supports thumb yet.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205508 91177308-0d34-0410-b5e6-96231b3b80d8
In particular, we only need to fetch the section if this is a relocatable
object.
No functionality change.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205499 91177308-0d34-0410-b5e6-96231b3b80d8
This reverts commit r205479.
It turns out that nm does use addresses, it is just that every reasonable
relocatable ELF object has sections with address 0. I have no idea if those
exist in reality, but it at least it shows that llvm-nm should use the name
address.
The added test was includes an unusual .o file with non 0 section addresses. I
created it by hacking ELFObjectWriter.cpp.
Really sorry for the churn.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205493 91177308-0d34-0410-b5e6-96231b3b80d8
What llvm-nm prints depends on the file format. On ELF for example, if the
file is relocatable, it prints offsets. If it is not, it prints addresses.
Since it doesn't really need to care what it is that it is printing, use the
generic term value.
Fix or implement getSymbolValue to keep llvm-nm working.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205479 91177308-0d34-0410-b5e6-96231b3b80d8
Some targets require more than one relocation entry to perform a relocation.
This change allows processRelocationRef to process more than one relocation
entry at a time by passing the relocation iterator itself instead of just
the relocation entry.
Related to <rdar://problem/16199095>
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This interface allows IRObjectFile to be implemented without having dummy
methods for all section and segment related methods.
Both llvm-ar and llvm-nm are changed to use it. Unfortunately the mangler is
still not plugged in since it requires some refactoring to make a Module hold
a DataLayout.
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COFF has only one symbol table.
MachO has a LC_DYSYMTAB, but that is not a symbol table, just extra info about
the one symbol table (LC_SYMTAB).
IR (coming soon) also has only one table.
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None of the object file formats reported error on iterator increment. In
retrospect, that is not too surprising: no object format stores symbols or
sections in a linked list or other structure that requires chasing pointers.
As a consequence, all error checking can be done on begin() and end().
This reduces the text segment of bin/llvm-readobj in my machine from 521233 to
518526 bytes.
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The compiler was warning about using | on a uintptr_t and bool:
Object/ELFObjectFile.h(131) : warning C4805: '|' : unsafe
mix of type 'uintptr_t' and type 'bool' in operation
I think the warning might be useful in other cases, so I added
a cast instead of disabling it altogether.
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* ELFTypes.h contains template magic for defining types based on endianess, size, and alignment.
* ELFFile.h defines the ELFFile class which provides low level ELF specific access.
* ELFObjectFile.h contains ELFObjectFile which uses ELFFile to implement the ObjectFile interface.
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