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[WinEH] Create an llvm.x86.seh.exceptioninfo intrinsic

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This intrinsic is like framerecover plus a load. It recovers the EH
registration stack allocation from the parent frame and loads the
exception information field out of it, giving back a pointer to an
EXCEPTION_POINTERS struct. It's designed for clang to use in SEH filter
expressions instead of accessing the EXCEPTION_POINTERS parameter that
is available on x64.

This required a minor change to MC to allow defining a label variable to
another absolute framerecover label variable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239567 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Kleckner
2015-06-11 22:32:23 +00:00
parent 5e9819c5bd
commit 3e16bd3aaf
10 changed files with 176 additions and 105 deletions
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13
include/llvm/CodeGen/WinEHFuncInfo.h
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@ -144,14 +144,15 @@ struct WinEHFuncInfo {
SmallVector<WinEHUnwindMapEntry, 4> UnwindMap;
SmallVector<WinEHTryBlockMapEntry, 4> TryBlockMap;
SmallVector<std::pair<MCSymbol *, int>, 4> IPToStateList;
int UnwindHelpFrameIdx;
int UnwindHelpFrameOffset;
int UnwindHelpFrameIdx = INT_MAX;
int UnwindHelpFrameOffset = -1;
unsigned NumIPToStateFuncsVisited = 0;
unsigned NumIPToStateFuncsVisited;
/// frameescape index of the 32-bit EH registration node. Set by
/// WinEHStatePass and used indirectly by SEH filter functions of the parent.
int EHRegNodeEscapeIndex = INT_MAX;
WinEHFuncInfo()
: UnwindHelpFrameIdx(INT_MAX), UnwindHelpFrameOffset(-1),
NumIPToStateFuncsVisited(0) {}
WinEHFuncInfo() {}
};
/// Analyze the IR in ParentFn and it's handlers to build WinEHFuncInfo, which