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author | Shih-wei Liao <sliao@google.com> | 2010-04-07 12:21:42 -0700 |
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committer | Shih-wei Liao <sliao@google.com> | 2010-04-07 12:21:42 -0700 |
commit | e4454320b3cfffe926a487c33fbeb454366de2f8 (patch) | |
tree | 133c05da684edf4a3b2529bcacfa996298c455f6 /lib/Target/PowerPC/PPCTargetMachine.cpp | |
parent | 20570085304f0a4ab4f112a01d77958bbd2827a1 (diff) | |
download | external_llvm-e4454320b3cfffe926a487c33fbeb454366de2f8.zip external_llvm-e4454320b3cfffe926a487c33fbeb454366de2f8.tar.gz external_llvm-e4454320b3cfffe926a487c33fbeb454366de2f8.tar.bz2 |
libbcc
Change-Id: Ieaa3ebd5a38f370752495549f8870b534eeedfc5
Diffstat (limited to 'lib/Target/PowerPC/PPCTargetMachine.cpp')
-rw-r--r-- | lib/Target/PowerPC/PPCTargetMachine.cpp | 29 |
1 files changed, 0 insertions, 29 deletions
diff --git a/lib/Target/PowerPC/PPCTargetMachine.cpp b/lib/Target/PowerPC/PPCTargetMachine.cpp index 22eecd4..cac6962 100644 --- a/lib/Target/PowerPC/PPCTargetMachine.cpp +++ b/lib/Target/PowerPC/PPCTargetMachine.cpp @@ -115,32 +115,3 @@ bool PPCTargetMachine::addCodeEmitter(PassManagerBase &PM, return false; } - -/// getLSDAEncoding - Returns the LSDA pointer encoding. The choices are 4-byte, -/// 8-byte, and target default. The CIE is hard-coded to indicate that the LSDA -/// pointer in the FDE section is an "sdata4", and should be encoded as a 4-byte -/// pointer by default. However, some systems may require a different size due -/// to bugs or other conditions. We will default to a 4-byte encoding unless the -/// system tells us otherwise. -/// -/// The issue is when the CIE says their is an LSDA. That mandates that every -/// FDE have an LSDA slot. But if the function does not need an LSDA. There -/// needs to be some way to signify there is none. The LSDA is encoded as -/// pc-rel. But you don't look for some magic value after adding the pc. You -/// have to look for a zero before adding the pc. The problem is that the size -/// of the zero to look for depends on the encoding. The unwinder bug in SL is -/// that it always checks for a pointer-size zero. So on x86_64 it looks for 8 -/// bytes of zero. If you have an LSDA, it works fine since the 8-bytes are -/// non-zero so it goes ahead and then reads the value based on the encoding. -/// But if you use sdata4 and there is no LSDA, then the test for zero gives a -/// false negative and the unwinder thinks there is an LSDA. -/// -/// FIXME: This call-back isn't good! We should be using the correct encoding -/// regardless of the system. However, there are some systems which have bugs -/// that prevent this from occuring. -DwarfLSDAEncoding::Encoding PPCTargetMachine::getLSDAEncoding() const { - if (Subtarget.isDarwin() && Subtarget.getDarwinVers() != 10) - return DwarfLSDAEncoding::Default; - - return DwarfLSDAEncoding::EightByte; -} |