//===----------------------------------------------------------------------===//
#include "llvm/MC/MCWin64EH.h"
-#include "llvm/MC/MCStreamer.h"
+#include "llvm/ADT/Twine.h"
#include "llvm/MC/MCContext.h"
-#include "llvm/MC/MCSymbol.h"
-#include "llvm/MC/MCSectionCOFF.h"
#include "llvm/MC/MCExpr.h"
-#include "llvm/Target/TargetAsmInfo.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCSectionCOFF.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
namespace llvm {
static void EmitUnwindCode(MCStreamer &streamer, MCSymbol *begin,
MCWin64EHInstruction &inst) {
- uint8_t b1, b2;
+ uint8_t b2;
uint16_t w;
b2 = (inst.getOperation() & 0x0F);
switch (inst.getOperation()) {
streamer.EmitIntValue(b2, 1);
break;
case Win64EH::UOP_SetFPReg:
- b1 = inst.getOffset() & 0xF0;
- streamer.EmitIntValue(b1, 1);
+ EmitAbsDifference(streamer, inst.getLabel(), begin);
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);
- streamer.EmitValue(MCSymbolRefExpr::Create(info->Begin, context), 4);
- streamer.EmitValue(MCSymbolRefExpr::Create(info->End, context), 4);
- streamer.EmitValue(MCSymbolRefExpr::Create(info->Symbol, context), 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);
}
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, context),
- 4);
- else if (numCodes < 2) {
+ streamer.EmitValue(MCSymbolRefExpr::Create(info->ExceptionHandler,
+ MCSymbolRefExpr::VK_COFF_IMGREL32,
+ context), 4);
+ else if (numCodes == 0) {
// 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.
- if (numCodes == 1)
- streamer.EmitIntValue(0, 2);
- else
- streamer.EmitIntValue(0, 4);
+ streamer.EmitIntValue(0, 4);
}
}
return "";
}
+static const MCSection *getWin64EHTableSection(StringRef suffix,
+ MCContext &context) {
+ if (suffix == "")
+ return context.getObjectFileInfo()->getXDataSection();
+
+ return context.getCOFFSection((".xdata"+suffix).str(),
+ COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
+ COFF::IMAGE_SCN_MEM_READ,
+ SectionKind::getDataRel());
+}
+
+static const MCSection *getWin64EHFuncTableSection(StringRef suffix,
+ MCContext &context) {
+ if (suffix == "")
+ return context.getObjectFileInfo()->getPDataSection();
+ return context.getCOFFSection((".pdata"+suffix).str(),
+ COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
+ COFF::IMAGE_SCN_MEM_READ,
+ SectionKind::getDataRel());
+}
+
void MCWin64EHUnwindEmitter::EmitUnwindInfo(MCStreamer &streamer,
MCWin64EHUnwindInfo *info) {
// Switch sections (the static function above is meant to be called from
// here and from Emit().
MCContext &context = streamer.getContext();
- const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
const MCSection *xdataSect =
- asmInfo.getWin64EHTableSection(GetSectionSuffix(info->Function));
+ getWin64EHTableSection(GetSectionSuffix(info->Function), context);
streamer.SwitchSection(xdataSect);
llvm::EmitUnwindInfo(streamer, info);
void MCWin64EHUnwindEmitter::Emit(MCStreamer &streamer) {
MCContext &context = streamer.getContext();
// Emit the unwind info structs first.
- const TargetAsmInfo &asmInfo = context.getTargetAsmInfo();
for (unsigned i = 0; i < streamer.getNumW64UnwindInfos(); ++i) {
MCWin64EHUnwindInfo &info = streamer.getW64UnwindInfo(i);
const MCSection *xdataSect =
- asmInfo.getWin64EHTableSection(GetSectionSuffix(info.Function));
+ getWin64EHTableSection(GetSectionSuffix(info.Function), context);
streamer.SwitchSection(xdataSect);
llvm::EmitUnwindInfo(streamer, &info);
}
for (unsigned i = 0; i < streamer.getNumW64UnwindInfos(); ++i) {
MCWin64EHUnwindInfo &info = streamer.getW64UnwindInfo(i);
const MCSection *pdataSect =
- asmInfo.getWin64EHFuncTableSection(GetSectionSuffix(info.Function));
+ getWin64EHFuncTableSection(GetSectionSuffix(info.Function), context);
streamer.SwitchSection(pdataSect);
EmitRuntimeFunction(streamer, &info);
}
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