Use SHT_X86_64_UNWIND on every OS.

[oota-llvm.git] / lib / MC / MCObjectFileInfo.cpp

diff --git a/lib/MC/MCObjectFileInfo.cpp b/lib/MC/MCObjectFileInfo.cpp
index 666a1c306c5f8cf47e7791d4f4c681e5097ea7c2..8849f5d4d122776bfce1aef8ab72a4bbe80aab8c 100644 (file)
--- a/lib/MC/MCObjectFileInfo.cpp
+++ b/lib/MC/MCObjectFileInfo.cpp
@@ -29,6 +29,10 @@ static bool useCompactUnwind(const Triple &T) {
   if (T.getArch() == Triple::aarch64)
     return true;
 
+  // armv7k always has it.
+  if (T.isWatchOS())
+    return true;
+
   // Use it on newer version of OS X.
   if (T.isMacOSX() && !T.isMacOSXVersionLT(10, 6))
     return true;
@@ -48,6 +52,9 @@ void MCObjectFileInfo::initMachOMCObjectFileInfo(Triple T) {
   if (T.isOSDarwin() && T.getArch() == Triple::aarch64)
     SupportsCompactUnwindWithoutEHFrame = true;
 
+  if (T.isWatchOS())
+    OmitDwarfIfHaveCompactUnwind = true;
+
   PersonalityEncoding = dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel
     | dwarf::DW_EH_PE_sdata4;
   LSDAEncoding = FDECFIEncoding = dwarf::DW_EH_PE_pcrel;
@@ -193,9 +200,11 @@ void MCObjectFileInfo::initMachOMCObjectFileInfo(Triple T) {
                              SectionKind::getReadOnly());
 
     if (T.getArch() == Triple::x86_64 || T.getArch() == Triple::x86)
-      CompactUnwindDwarfEHFrameOnly = 0x04000000;
+      CompactUnwindDwarfEHFrameOnly = 0x04000000;  // UNWIND_X86_64_MODE_DWARF
     else if (T.getArch() == Triple::aarch64)
-      CompactUnwindDwarfEHFrameOnly = 0x03000000;
+      CompactUnwindDwarfEHFrameOnly = 0x03000000;  // UNWIND_ARM64_MODE_DWARF
+    else if (T.getArch() == Triple::arm || T.getArch() == Triple::thumb)
+      CompactUnwindDwarfEHFrameOnly = 0x04000000;  // UNWIND_ARM_MODE_DWARF
   }
 
   // Debug Information.
@@ -407,16 +416,14 @@ void MCObjectFileInfo::initELFMCObjectFileInfo(Triple T) {
     break;
   }
 
+  EHSectionType = T.getArch() == Triple::x86_64 ? ELF::SHT_X86_64_UNWIND
+                                                : ELF::SHT_PROGBITS;
+
   // Solaris requires different flags for .eh_frame to seemingly every other
   // platform.
-  EHSectionType = ELF::SHT_PROGBITS;
   EHSectionFlags = ELF::SHF_ALLOC;
-  if (T.isOSSolaris()) {
-    if (T.getArch() == Triple::x86_64)
-      EHSectionType = ELF::SHT_X86_64_UNWIND;
-    else
-      EHSectionFlags |= ELF::SHF_WRITE;
-  }
+  if (T.isOSSolaris() && T.getArch() != Triple::x86_64)
+    EHSectionFlags |= ELF::SHF_WRITE;
 
   // ELF
   BSSSection = Ctx->getELFSection(".bss", ELF::SHT_NOBITS,
@@ -767,6 +774,7 @@ void MCObjectFileInfo::InitMCObjectFileInfo(const Triple &TheTriple,
   CommDirectiveSupportsAlignment = true;
   SupportsWeakOmittedEHFrame = true;
   SupportsCompactUnwindWithoutEHFrame = false;
+  OmitDwarfIfHaveCompactUnwind = false;
 
   PersonalityEncoding = LSDAEncoding = FDECFIEncoding = TTypeEncoding =
       dwarf::DW_EH_PE_absptr;