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As of LLVM 3.9, the x86-call-frame-opt pass in LLVM's X86 backend causes
the stack descriptors to contain incorrect (or even negative) frame
sizes or root slot offsets.
This might cause LLVM-compiled modules to be rejected during loading
with a badarg exception in hipe_bifs:enter_sdecs/1 (which additionally
prints a "hipe_bifs_enter_sdesc_1: bad sdesc!" message to stderr), or it
might cause corruption or segmentation faults when walking stacks (f.ex.
during GC) containing frames compiled with ErLLVM.
As a workaround, we pass the -no-x86-call-frame-opt flag to llc when
the version is at least 3.9
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Since 3.7, LLVM sometimes generates SSE constants in a special constant
section with the requisite alignment (".rodata.cst16"). This broke
hipe_llvm since it assumed that all constants that were linked from the
text section were constants generated by hipe_llvm.
As this is the first time alignments larger than 8 have been required,
some small changes were required to hipe_consttab and
hipe_bifs:alloc_data/2. Note that hipe_bifs:alloc_data/2 still assumes
that erl_alloc will provide the requisite alignment.
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This allows for much more robust interpretation of relocations, symbols
and sections in hipe_llvm_main, without the clunkiness of an abstract
interface between two internal modules that belong to the same subsystem
anyway.
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The elf_format module was written in such a way that some of the
customisation to ELF-32 vs ELF-64 was made at compile-time and some of
it at run-time. As such it was not actually possible to read 32-bit
files with a module compiled for 64-bit support, or vice versa.
As the run-time selection uses some process dictionary ugliness, it was
removed, shifting all the customisation to be compile-time.
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In case of function calls with arguments that are passed to the stack,
the frame size of corresponding stack descriptors needs to be reduced by
the number of stack arguments. This commit fixes a bug in this
adjustment which was caused by an incorrect check.
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