hipe_llvm: Allow LLVM-generated constants

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.

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/hipe/llvm/elf_format.erl b/lib/hipe/llvm/elf_format.erl
index 4155dff7c4..b3c5ecddab 100644
--- a/lib/hipe/llvm/elf_format.erl
+++ b/lib/hipe/llvm/elf_format.erl
@@ -23,6 +23,8 @@
 	 get_exn_handlers/1,
 	 %% Symbols
 	 elf_symbols/1,
+	 %% Sections
+	 section_contents/2,
 	 %% Main interface
 	 read/1
         ]).
@@ -312,6 +314,11 @@ elf_section(?SHN_ABS, #elf{}) -> abs;
 elf_section(Index, #elf{sec_idx=SecIdx}) when Index =< tuple_size(SecIdx) ->
   element(Index, SecIdx).
 
+%% Reads the contents of a section from an object
+-spec section_contents(elf_shdr(), elf()) -> binary().
+section_contents(#elf_shdr{offset=Offset, size=Size}, #elf{file=ElfBin}) ->
+  get_binary_segment(ElfBin, Offset, Size).
+
 %%------------------------------------------------------------------------------
 %% Functions to manipulate Symbol Table
 %%------------------------------------------------------------------------------