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authorPascal Stumpf <pascal@cvs.openbsd.org>2016-09-03 22:47:03 +0000
committerPascal Stumpf <pascal@cvs.openbsd.org>2016-09-03 22:47:03 +0000
commitc07c59953ad4d4f16e8c3a3e25692ad9657db3ea (patch)
treee5a516d9d25bf178ab50dad2aa60c32b8684d5ee /gnu/llvm/lib/MC/MCWinEH.cpp
parent62bc401a55deb1281a3a42cd4f08325a6839a171 (diff)
Use the space freed up by sparc and zaurus to import LLVM.
ok hackroom@
Diffstat (limited to 'gnu/llvm/lib/MC/MCWinEH.cpp')
-rw-r--r--gnu/llvm/lib/MC/MCWinEH.cpp79
1 files changed, 79 insertions, 0 deletions
diff --git a/gnu/llvm/lib/MC/MCWinEH.cpp b/gnu/llvm/lib/MC/MCWinEH.cpp
new file mode 100644
index 00000000000..83af203c7ac
--- /dev/null
+++ b/gnu/llvm/lib/MC/MCWinEH.cpp
@@ -0,0 +1,79 @@
+//===- lib/MC/MCWinEH.cpp - Windows EH implementation ---------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/ADT/StringRef.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCSectionCOFF.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCWinEH.h"
+#include "llvm/Support/COFF.h"
+
+namespace llvm {
+namespace WinEH {
+
+/// We can't have one section for all .pdata or .xdata because the Microsoft
+/// linker seems to want all code relocations to refer to the same object file
+/// section. If the code described is comdat, create a new comdat section
+/// associated with that comdat. If the code described is not in the main .text
+/// section, make a new section for it. Otherwise use the main unwind info
+/// section.
+static MCSection *getUnwindInfoSection(StringRef SecName,
+ MCSectionCOFF *UnwindSec,
+ const MCSymbol *Function,
+ MCContext &Context) {
+ if (Function && Function->isInSection()) {
+ // If Function is in a COMDAT, get or create an unwind info section in that
+ // COMDAT group.
+ const MCSectionCOFF *FunctionSection =
+ cast<MCSectionCOFF>(&Function->getSection());
+ if (FunctionSection->getCharacteristics() & COFF::IMAGE_SCN_LNK_COMDAT) {
+ return Context.getAssociativeCOFFSection(
+ UnwindSec, FunctionSection->getCOMDATSymbol());
+ }
+
+ // If Function is in a section other than .text, create a new .pdata section.
+ // Otherwise use the plain .pdata section.
+ if (const auto *Section = dyn_cast<MCSectionCOFF>(FunctionSection)) {
+ StringRef CodeSecName = Section->getSectionName();
+ if (CodeSecName == ".text")
+ return UnwindSec;
+
+ if (CodeSecName.startswith(".text$"))
+ CodeSecName = CodeSecName.substr(6);
+
+ return Context.getCOFFSection((SecName + Twine('$') + CodeSecName).str(),
+ COFF::IMAGE_SCN_CNT_INITIALIZED_DATA |
+ COFF::IMAGE_SCN_MEM_READ,
+ SectionKind::getData());
+ }
+ }
+
+ return UnwindSec;
+
+}
+
+MCSection *UnwindEmitter::getPDataSection(const MCSymbol *Function,
+ MCContext &Context) {
+ MCSectionCOFF *PData =
+ cast<MCSectionCOFF>(Context.getObjectFileInfo()->getPDataSection());
+ return getUnwindInfoSection(".pdata", PData, Function, Context);
+}
+
+MCSection *UnwindEmitter::getXDataSection(const MCSymbol *Function,
+ MCContext &Context) {
+ MCSectionCOFF *XData =
+ cast<MCSectionCOFF>(Context.getObjectFileInfo()->getXDataSection());
+ return getUnwindInfoSection(".xdata", XData, Function, Context);
+}
+
+}
+}
+