summaryrefslogtreecommitdiffstats
path: root/llvm/lib/CodeGen/AsmPrinter/WinException.cpp
Commit message (Collapse)AuthorAgeFilesLines
...
* [WinEH] Fix ip2state table emission with funcletsReid Kleckner2015-09-281-52/+65
| | | | | | | Previously we were hijacking the old LandingPadInfo data structures to communicate our state numbers. Now we don't need that anymore. llvm-svn: 248763
* [WinEH] Rip out the landingpad-based C++ EH state numbering codeReid Kleckner2015-09-161-84/+29
| | | | | | It never really worked, and the new code is working better every day. llvm-svn: 247860
* [WinEH] Pull Adjectives and CatchObj out of the catchpad arg listReid Kleckner2015-09-161-0/+10
| | | | | | | | | | Clang now passes the adjectives as an argument to catchpad. Getting the CatchObj working is simply a matter of threading another static alloca through codegen, first as an alloca, then as a frame index, and finally as a frame offset. llvm-svn: 247844
* [X86] Make sure startproc/endproc are pairedDavid Majnemer2015-09-111-1/+1
| | | | | | | | | | We used different conditions to determine if we should emit startproc vs endproc. Use the same condition to ensure that they will always be paired. This fixes PR24374. llvm-svn: 247435
* [WinEH] Add codegen support for cleanuppad and cleanupretReid Kleckner2015-09-101-4/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | All of the complexity is in cleanupret, and it mostly follows the same codepaths as catchret, except it doesn't take a return value in RAX. This small example now compiles and executes successfully on win32: extern "C" int printf(const char *, ...) noexcept; struct Dtor { ~Dtor() { printf("~Dtor\n"); } }; void has_cleanup() { Dtor o; throw 42; } int main() { try { has_cleanup(); } catch (int) { printf("caught it\n"); } } Don't try to put the cleanup in the same function as the catch, or Bad Things will happen. llvm-svn: 247219
* [SEH] Emit 32-bit SEH tables for the new EH IRReid Kleckner2015-09-091-13/+39
| | | | | | | | | | | The 32-bit tables don't actually contain PC range data, so emitting them is incredibly simple. The 64-bit tables, on the other hand, use the same table for state numbering as well as label ranges. This makes things more difficult, so it will be implemented later. llvm-svn: 247192
* [WinEH] Emit prologues and epilogues for funcletsReid Kleckner2015-09-081-6/+14
| | | | | | | | | | | | | | | | | | | | | | | | Summary: 32-bit funclets have short prologues that allocate enough stack for the largest call in the whole function. The runtime saves CSRs for the funclet. It doesn't restore CSRs after we finally transfer control back to the parent funciton via a CATCHRET, but that's a separate issue. 32-bit funclets also have to adjust the incoming EBP value, which is what llvm.x86.seh.recoverframe does in the old model. 64-bit funclets need to spill CSRs as normal. For simplicity, this just spills the same set of CSRs as the parent function, rather than trying to compute different CSR sets for the parent function and each funclet. 64-bit funclets also allocate enough stack space for the largest outgoing call frame, like 32-bit. Reviewers: majnemer Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D12546 llvm-svn: 247092
* [WinEH] Add some support for code generating catchpadReid Kleckner2015-08-271-22/+36
| | | | | | | We can now run 32-bit programs with empty catch bodies. The next step is to change PEI so that we get funclet prologues and epilogues. llvm-svn: 246235
* [WinEH] Calculate state numbers for the new EH representationDavid Majnemer2015-08-181-4/+5
| | | | | | | | | | | State numbers are calculated by performing a walk from the innermost funclet to the outermost funclet. Rudimentary support for the new EH constructs has been added to the assembly printer, just enough to test the new machinery. Differential Revision: http://reviews.llvm.org/D12098 llvm-svn: 245331
* [CodeGen] Force emission of personality directive if explicitly specifiedKeno Fischer2015-07-141-2/+6
| | | | | | | | | | | | | | | | | | | Summary: Before this change, personality directives were not emitted if there was no invoke left in the function (of course until recently this also meant that we couldn't know what the personality actually was). This patch forces personality directives to still be emitted, unless it is known to be a noop in the absence of invokes, or the user explicitly specified `nounwind` (and not `uwtable`) on the function. Reviewers: majnemer, rnk Subscribers: rnk, llvm-commits Differential Revision: http://reviews.llvm.org/D10884 llvm-svn: 242185
* [WinEH] Emit the LSDA even if no lpads remain but outlining occurredReid Kleckner2015-07-131-6/+14
| | | | | | | | | | | | | | | The outlined funclets call intrinsics which reference labels from the LSDA. This situation can easily arise in small functions with a single cleanup at -O0, where Clang marks a definition as nounwind, and then WinEHPrepare "discovers" that the landingpad is dead by accident and deletes it. We now need to ask the LLVM IR Function for it's personality directly, rather than going through MachineModuleInfo. Fixes PR23892. llvm-svn: 242063
* [WinEH] Make sure LSDA tables are 4 byte alignedReid Kleckner2015-07-101-0/+2
| | | | | | | | | | Apparently this is important, otherwise _except_handler3 assumes that the registration node is corrupted and ignores it. Also fix a bug in WinEHPrepare where we would insert code after a terminator instruction. llvm-svn: 241877
* Rename llvm.frameescape and llvm.framerecover to localescape and localrecoverReid Kleckner2015-07-071-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | Summary: Initially, these intrinsics seemed like part of a family of "frame" related intrinsics, but now I think that's more confusing than helpful. Initially, the LangRef specified that this would create a new kind of allocation that would be allocated at a fixed offset from the frame pointer (EBP/RBP). We ended up dropping that design, and leaving the stack frame layout alone. These intrinsics are really about sharing local stack allocations, not frame pointers. I intend to go further and add an `llvm.localaddress()` intrinsic that returns whatever register (EBP, ESI, ESP, RBX) is being used to address locals, which should not be confused with the frame pointer. Naming suggestions at this point are welcome, I'm happy to re-run sed. Reviewers: majnemer, nicholas Subscribers: llvm-commits Differential Revision: http://reviews.llvm.org/D11011 llvm-svn: 241633
* [SEH] Add new intrinsics for recovering and restoring parent framesReid Kleckner2015-06-301-15/+21
| | | | | | | | | | | | | | | | | | | | | | | | | The incoming EBP value established by the runtime is actually a pointer to the end of the EH registration object, and not the true parent function frame pointer. Clang doesn't need llvm.x86.seh.exceptioninfo anymore because we know that the exception info pointer is at a fixed offset from this incoming EBP. The llvm.x86.seh.recoverfp intrinsic takes an EBP value provided by the EH runtime and returns a pointer that is usable with llvm.framerecover. The llvm.x86.seh.restoreframe intrinsic is inserted by the 32-bit specific preparation pass in blocks targetted by the EH runtime. It re-establishes any physical registers used by the parent function to address the stack, such as the frame, base, and stack pointers. Neither of these intrinsics correctly handle stack realignment prologues yet, but it's possible to add that later. Reviewers: majnemer Differential Revision: http://reviews.llvm.org/D10848 llvm-svn: 241125
* [WinEH] Put finally pointers in the handler scope table fieldReid Kleckner2015-06-111-14/+13
| | | | | | | | | | We were putting them in the filter field, which is correct for 64-bit but wrong for 32-bit. Also switch the order of scope table entry emission so outermost entries are emitted first, and fix an obvious state assignment bug. llvm-svn: 239574
* [WinEH] Create an llvm.x86.seh.exceptioninfo intrinsicReid Kleckner2015-06-111-3/+18
| | | | | | | | | | | | | | 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. llvm-svn: 239567
* [WinEH] _except_handlerN uses 0 instead of 1 to indicate catch-allReid Kleckner2015-06-101-6/+4
| | | | | | Our usage of 1 was a holdover from __C_specific_handler. llvm-svn: 239482
* Remove safeseh debug print and remove extra bracesReid Kleckner2015-06-101-5/+2
| | | | llvm-svn: 239449
* [WinEH] Emit .safeseh directives for all 32-bit exception handlersReid Kleckner2015-06-101-0/+8
| | | | | | | | | | Use a "safeseh" string attribute to do this. You would think we chould just accumulate the set of personalities like we do on dwarf, but this fails to account for the LSDA-loading thunks we use for __CxxFrameHandler3. Each of those needs to make it into .sxdata as well. The string attribute seemed like the most straightforward approach. llvm-svn: 239448
* Fix -Wsign-compare warning in WinException.cppReid Kleckner2015-06-101-1/+2
| | | | llvm-svn: 239445
* [WinEH] Add 32-bit SEH state table emission prototypeReid Kleckner2015-06-091-1/+88
| | | | | | | | | | | | This gets all the handler info through to the asm printer and we can look at the .xdata tables now. I've convinced one small catch-all test case to work, but other than that, it would be a stretch to say this is functional. The state numbering algorithm avoids doing any scope reconstruction as we do for C++ to simplify the implementation. llvm-svn: 239433
* MC: Clean up MCExpr naming. NFC.Jim Grosbach2015-05-301-9/+9
| | | | llvm-svn: 238634
* [WinEH] Emit EH tables for __CxxFrameHandler3 on 32-bit x86Reid Kleckner2015-05-291-132/+171
| | | | | | | | | | | | | 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
* Rename Win64Exception.(cpp|h) to WinException.(cpp|h)Reid Kleckner2015-05-281-0/+504
This is in preparation for reusing this for 32-bit x86 EH table emission. Also updates the type name for consistency. NFC llvm-svn: 238521
OpenPOWER on IntegriCloud