static void EmitUnwindCode(MCStreamer &streamer, MCSymbol *begin,
MCWin64EHInstruction &inst) {
- uint8_t b2;
+ uint8_t b1, b2;
uint16_t w;
b2 = (inst.getOperation() & 0x0F);
switch (inst.getOperation()) {
streamer.EmitIntValue(b2, 1);
break;
case Win64EH::UOP_SetFPReg:
- EmitAbsDifference(streamer, inst.getLabel(), begin);
+ b1 = inst.getOffset() & 0xF0;
+ streamer.EmitIntValue(b1, 1);
streamer.EmitIntValue(b2, 1);
break;
case Win64EH::UOP_SaveNonVol:
}
}
-static void EmitSymbolRefWithOfs(MCStreamer &streamer,
- const MCSymbol *Base,
- const MCSymbol *Other) {
- MCContext &Context = streamer.getContext();
- const MCSymbolRefExpr *BaseRef = MCSymbolRefExpr::Create(Base, Context);
- const MCSymbolRefExpr *OtherRef = MCSymbolRefExpr::Create(Other, Context);
- const MCExpr *Ofs = MCBinaryExpr::CreateSub(OtherRef, BaseRef, Context);
- const MCSymbolRefExpr *BaseRefRel = MCSymbolRefExpr::Create(Base,
- MCSymbolRefExpr::VK_COFF_IMGREL32,
- Context);
- streamer.EmitValue(MCBinaryExpr::CreateAdd(BaseRefRel, Ofs, Context), 4);
-}
-
static void EmitRuntimeFunction(MCStreamer &streamer,
const MCWin64EHUnwindInfo *info) {
MCContext &context = streamer.getContext();
streamer.EmitValueToAlignment(4);
- EmitSymbolRefWithOfs(streamer, info->Function, info->Begin);
- EmitSymbolRefWithOfs(streamer, info->Function, info->End);
- streamer.EmitValue(MCSymbolRefExpr::Create(info->Symbol,
- MCSymbolRefExpr::VK_COFF_IMGREL32,
- context), 4);
+ streamer.EmitValue(MCSymbolRefExpr::Create(info->Begin, context), 4);
+ streamer.EmitValue(MCSymbolRefExpr::Create(info->End, context), 4);
+ streamer.EmitValue(MCSymbolRefExpr::Create(info->Symbol, context), 4);
}
static void EmitUnwindInfo(MCStreamer &streamer, MCWin64EHUnwindInfo *info) {
MCContext &context = streamer.getContext();
streamer.EmitValueToAlignment(4);
+ // Upper 3 bits are the version number (currently 1).
+ uint8_t flags = 0x01;
info->Symbol = context.CreateTempSymbol();
streamer.EmitLabel(info->Symbol);
- // Upper 3 bits are the version number (currently 1).
- uint8_t flags = 0x01;
if (info->ChainedParent)
flags |= Win64EH::UNW_ChainInfo << 3;
else {
EmitUnwindCode(streamer, info->Begin, inst);
}
- // For alignment purposes, the instruction array will always have an even
- // number of entries, with the final entry potentially unused (in which case
- // the array will be one longer than indicated by the count of unwind codes
- // field).
- if (numCodes & 1) {
- streamer.EmitIntValue(0, 2);
- }
-
if (flags & (Win64EH::UNW_ChainInfo << 3))
EmitRuntimeFunction(streamer, info->ChainedParent);
else if (flags &
((Win64EH::UNW_TerminateHandler|Win64EH::UNW_ExceptionHandler) << 3))
- streamer.EmitValue(MCSymbolRefExpr::Create(info->ExceptionHandler,
- MCSymbolRefExpr::VK_COFF_IMGREL32,
- context), 4);
- else if (numCodes == 0) {
+ streamer.EmitValue(MCSymbolRefExpr::Create(info->ExceptionHandler, context),
+ 4);
+ else if (numCodes < 2) {
// The minimum size of an UNWIND_INFO struct is 8 bytes. If we're not
// a chained unwind info, if there is no handler, and if there are fewer
// than 2 slots used in the unwind code array, we have to pad to 8 bytes.
- streamer.EmitIntValue(0, 4);
+ if (numCodes == 1)
+ streamer.EmitIntValue(0, 2);
+ else
+ streamer.EmitIntValue(0, 4);
}
}