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[ARM64] [Windows] Improve error reporting for unsupported SEH unwind. 

Use report_fatal_error instead of crashing or miscompiling. (It's
currently easier than it should be to hit this case because we don't
reuse codes across epilogs.)

llvm-svn: 346440
This commit is contained in:
Eli Friedman 2018-11-08 21:20:52 +00:00
parent 436f7b6d8a
commit ab296670e1
1 changed files with 7 additions and 2 deletions
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9
llvm/lib/MC/MCWin64EH.cpp
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@ -487,8 +487,8 @@ static void ARM64EmitUnwindInfo(MCStreamer &streamer, WinEH::FrameInfo *info) {
// Code Words, Epilog count, E, X, Vers, Function Length
uint32_t row1 = 0x0;
uint8_t CodeWords = TotalCodeBytes / 4;
uint8_t CodeWordsMod = TotalCodeBytes % 4;
uint32_t CodeWords = TotalCodeBytes / 4;
uint32_t CodeWordsMod = TotalCodeBytes % 4;
if (CodeWordsMod)
CodeWords++;
uint32_t EpilogCount = info->EpilogMap.size();
@ -505,6 +505,11 @@ static void ARM64EmitUnwindInfo(MCStreamer &streamer, WinEH::FrameInfo *info) {
// Extended Code Words, Extended Epilog Count
if (ExtensionWord) {
// FIXME: We should be able to split unwind info into multiple sections.
// FIXME: We should share epilog codes across epilogs, where possible,
// which would make this issue show up less frequently.
if (CodeWords > 0xFF || EpilogCount > 0xFFFF)
report_fatal_error("SEH unwind data splitting not yet implemented");
uint32_t row2 = 0x0;
row2 |= (CodeWords & 0xFF) << 16;
row2 |= (EpilogCount & 0xFFFF);