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The large code model is documented at http://www.x86-64.org/documentation/abi.pdf and says that calls should assume their target doesn't live within the 32-bit pc-relative offset that fits in the call instruction. To do this, we turn off the global-address->target-global-address conversion in X86TargetLowering::LowerCall(). The first attempt at this broke the lazy JIT because it can separate the movabs(imm->reg) from the actual call instruction. The lazy JIT receives the address of the movabs as a relocation and needs to record the return address from the call; and then when that call happens, it needs to patch the movabs with the newly-compiled target. We could thread the call instruction into the relocation and record the movabs<->call mapping explicitly, but that seems to require at least as much new complication in the code generator as this change. To fix this, we make lazy functions _always_ go through a call stub. You'd think we'd only have to force lazy calls through a stub on difficult platforms, but that turns out to break indirect calls through a function pointer. The right fix for that is to distinguish between calls and address-of operations on uncompiled functions, but that's complex enough to leave for someone else to do. Another attempt at this defined a new CALL64i pseudo-instruction, which expanded to a 2-instruction sequence in the assembly output and was special-cased in the X86CodeEmitter's emitInstruction() function. That broke indirect calls in the same way as above. This patch also removes a hack forcing Darwin to the small code model. Without far-call-stubs, the small code model requires things of the JITMemoryManager that the DefaultJITMemoryManager can't provide. Thanks to echristo for lots of testing! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@88984 91177308-0d34-0410-b5e6-96231b3b80d8 |
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buildit | ||
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crosstool | ||
emacs | ||
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fpcmp | ||
jedit | ||
lint | ||
lit | ||
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PerfectShuffle | ||
TableGen | ||
unittest | ||
valgrind | ||
vim | ||
cgiplotNLT.pl | ||
check-each-file | ||
codegen-diff | ||
countloc.sh | ||
DSAclean.py | ||
DSAextract.py | ||
findmisopt | ||
findoptdiff | ||
findsym.pl | ||
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getsrcs.sh | ||
importNLT.pl | ||
llvm-native-gcc | ||
llvm-native-gxx | ||
llvm.grm | ||
llvmdo | ||
llvmgrep | ||
Makefile | ||
makellvm | ||
mkpatch | ||
NewNightlyTest.pl | ||
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NightlyTestTemplate.html | ||
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parseNLT.pl | ||
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profile.pl | ||
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UpdateCMakeLists.pl | ||
userloc.pl | ||
webNLT.pl |