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10 Commits

Author SHA1 Message Date
Reid Kleckner e6531a5588 [WinEH] Adjust the 32-bit SEH prologue to better match reality 
It turns out that _except_handler3 and _except_handler4 really use the
same stack allocation layout, at least today. They just make different
choices about encoding the LSDA.

This is in preparation for lowering the llvm.eh.exceptioninfo().

llvm-svn: 238627
 2015-05-29 22:57:46 +00:00
Reid Kleckner 173a72524f Disable FP elimination in funcs using 32-bit MSVC EH personalities 
The value in 'ebp' acts as an implicit argument to the outlined
handlers, and is recovered with frameaddress(1).

llvm-svn: 238619
 2015-05-29 21:58:11 +00:00
Reid Kleckner 1d3d4adbb9 [WinEH] Emit EH tables for __CxxFrameHandler3 on 32-bit x86 
Small (really small!) C++ exception handling examples work on 32-bit x86
now.

This change disables the use of .seh_* directives in WinException when
CFI is not in use. It also uses absolute symbol references in the tables
instead of imagerel32 relocations.

Also fixes a cache invalidation bug in MMI personality classification.

llvm-svn: 238575
 2015-05-29 17:00:57 +00:00
Reid Kleckner fe4d491bd9 [WinEH] Start inserting state number stores for C++ EH 
This moves all the state numbering code for C++ EH to WinEHPrepare so
that we can call it from the X86 state numbering IR pass that runs
before isel.

Now we just call the same state numbering machinery and insert a bunch
of stores. It also populates MachineModuleInfo with information about
the current function.

llvm-svn: 238514
 2015-05-28 22:00:24 +00:00
Reid Kleckner 2632f0df48 [WinEH] Store pointers to the LSDA in the exception registration object 
We aren't yet emitting the LSDA yet, so this will still fail to
assemble.

llvm-svn: 237852
 2015-05-20 23:08:04 +00:00
Reid Kleckner 0738a9c02e Re-land "[WinEH] Add an EH registration and state insertion pass for 32-bit x86" 
This reverts commit r236360.

This change exposed a bug in WinEHPrepare by opting win32 code into EH
preparation. We already knew that WinEHPrepare has bugs, and is the
status quo for x64, so I don't think that's a reason to hold off on this
change. I disabled exceptions in the sanitizer tests in r236505 and an
earlier revision.

llvm-svn: 236508
 2015-05-05 17:44:16 +00:00
Reid Kleckner 83d89fa546 Revert "[WinEH] Add an EH registration and state insertion pass for 32-bit x86" 
This reverts commit r236359. Things are still broken despite testing. :(

llvm-svn: 236360
 2015-05-01 22:50:14 +00:00
Reid Kleckner 51476acd77 Re-land "[WinEH] Add an EH registration and state insertion pass for 32-bit x86" 
This reverts commit r236340.

llvm-svn: 236359
 2015-05-01 22:40:25 +00:00
Reid Kleckner 2747d3d55a Revert "[WinEH] Add an EH registration and state insertion pass for 32-bit x86" 
This reverts commit r236339, it breaks the win32 clang-cl self-host.

llvm-svn: 236340
 2015-05-01 20:14:04 +00:00
Reid Kleckner 4856fc61b4 [WinEH] Add an EH registration and state insertion pass for 32-bit x86 
This pass is responsible for constructing the EH registration object
that gets linked into fs:00, which is all it does in this change. In the
future, it will also insert stores to update the EH state number.

I considered keeping this functionality in WinEHPrepare, but it's pretty
separable and X86 specific. It has conceptually very little to do with
the task of WinEHPrepare, which is currently outlining.  WinEHPrepare is
also in theory useful on ARM, but this logic is pretty x86 specific.

Reviewers: andrew.w.kaylor, majnemer

Differential Revision: http://reviews.llvm.org/D9422

llvm-svn: 236339
 2015-05-01 20:04:54 +00:00