Move getNonexecutableStackSection up to the base ELF class.

[oota-llvm.git] / lib / Target / X86 / MCTargetDesc / X86MCAsmInfo.cpp

diff --git a/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp b/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
index 2fdd7e9d709f8ab68c6325662592d91139b88818..3a67f6a5f9135b9e9930d2018802380cb7dac5fa 100644 (file)
--- a/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
+++ b/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
@@ -12,7 +12,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "X86MCAsmInfo.h"
-#include "X86TargetMachine.h"
 #include "llvm/ADT/Triple.h"
 #include "llvm/MC/MCContext.h"
 #include "llvm/MC/MCExpr.h"
@@ -35,32 +34,24 @@ AsmWriterFlavor("x86-asm-syntax", cl::init(ATT),
              clEnumValN(Intel, "intel", "Emit Intel-style assembly"),
              clEnumValEnd));
 
+static cl::opt<bool>
+MarkedJTDataRegions("mark-data-regions", cl::init(false),
+  cl::desc("Mark code section jump table data regions."),
+  cl::Hidden);
 
-static const char *const x86_asm_table[] = {
-  "{si}", "S",
-  "{di}", "D",
-  "{ax}", "a",
-  "{cx}", "c",
-  "{memory}", "memory",
-  "{flags}", "",
-  "{dirflag}", "",
-  "{fpsr}", "",
-  "{fpcr}", "",
-  "{cc}", "cc",
-  0,0};
+void X86MCAsmInfoDarwin::anchor() { }
 
 X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &T) {
   bool is64Bit = T.getArch() == Triple::x86_64;
   if (is64Bit)
-    PointerSize = 8;
+    PointerSize = CalleeSaveStackSlotSize = 8;
 
-  AsmTransCBE = x86_asm_table;
   AssemblerDialect = AsmWriterFlavor;
 
   TextAlignFillValue = 0x90;
 
   if (!is64Bit)
-    Data64bitsDirective = 0;       // we can't emit a 64-bit unit
+    Data64bitsDirective = nullptr;       // we can't emit a 64-bit unit
 
   // Use ## as a comment string so that .s files generated by llvm can go
   // through the GCC preprocessor without causing an error.  This is needed
@@ -68,34 +59,48 @@ X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &T) {
   // for .S files on other systems.  Perhaps this is because the file system
   // wasn't always case preserving or something.
   CommentString = "##";
-  PCSymbol = ".";
 
   SupportsDebugInformation = true;
-  DwarfUsesInlineInfoSection = true;
+  UseDataRegionDirectives = MarkedJTDataRegions;
 
   // Exceptions handling
   ExceptionsType = ExceptionHandling::DwarfCFI;
+
+  // old assembler lacks some directives
+  // FIXME: this should really be a check on the assembler characteristics
+  // rather than OS version
+  if (T.isMacOSX() && T.isMacOSXVersionLT(10, 6))
+    HasWeakDefCanBeHiddenDirective = false;
+
+  // Assume ld64 is new enough that the abs-ified FDE relocs may be used
+  // (actually, must, since otherwise the non-extern relocations we produce
+  // overwhelm ld64's tiny little mind and it fails).
+  DwarfFDESymbolsUseAbsDiff = true;
+
+  UseIntegratedAssembler = true;
 }
 
 X86_64MCAsmInfoDarwin::X86_64MCAsmInfoDarwin(const Triple &Triple)
   : X86MCAsmInfoDarwin(Triple) {
 }
 
+void X86ELFMCAsmInfo::anchor() { }
+
 X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
-  if (T.getArch() == Triple::x86_64)
-    PointerSize = 8;
+  bool is64Bit = T.getArch() == Triple::x86_64;
+  bool isX32 = T.getEnvironment() == Triple::GNUX32;
 
-  AsmTransCBE = x86_asm_table;
-  AssemblerDialect = AsmWriterFlavor;
+  // For ELF, x86-64 pointer size depends on the ABI.
+  // For x86-64 without the x32 ABI, pointer size is 8. For x86 and for x86-64
+  // with the x32 ABI, pointer size remains the default 4.
+  PointerSize = (is64Bit && !isX32) ? 8 : 4;
 
-  TextAlignFillValue = 0x90;
+  // OTOH, stack slot size is always 8 for x86-64, even with the x32 ABI.
+  CalleeSaveStackSlotSize = is64Bit ? 8 : 4;
 
-  PrivateGlobalPrefix = ".L";
-  WeakRefDirective = "\t.weak\t";
-  PCSymbol = ".";
+  AssemblerDialect = AsmWriterFlavor;
 
-  // Set up DWARF directives
-  HasLEB128 = true;  // Target asm supports leb128 directives (little-endian)
+  TextAlignFillValue = 0x90;
 
   // Debug Information
   SupportsDebugInformation = true;
@@ -103,10 +108,15 @@ X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
   // Exceptions handling
   ExceptionsType = ExceptionHandling::DwarfCFI;
 
-  // OpenBSD has buggy support for .quad in 32-bit mode, just split into two
-  // .words.
-  if (T.getOS() == Triple::OpenBSD && T.getArch() == Triple::x86)
-    Data64bitsDirective = 0;
+  // OpenBSD and Bitrig have buggy support for .quad in 32-bit mode, just split
+  // into two .words.
+  if ((T.getOS() == Triple::OpenBSD || T.getOS() == Triple::Bitrig) &&
+       T.getArch() == Triple::x86)
+    Data64bitsDirective = nullptr;
+
+  // Always enable the integrated assembler by default.
+  // Clang also enabled it when the OS is Solaris but that is redundant here.
+  UseIntegratedAssembler = true;
 }
 
 const MCExpr *
@@ -120,20 +130,41 @@ X86_64MCAsmInfoDarwin::getExprForPersonalitySymbol(const MCSymbol *Sym,
   return MCBinaryExpr::CreateAdd(Res, Four, Context);
 }
 
-const MCSection *X86ELFMCAsmInfo::
-getNonexecutableStackSection(MCContext &Ctx) const {
-  return Ctx.getELFSection(".note.GNU-stack", ELF::SHT_PROGBITS,
-                           0, SectionKind::getMetadata());
+void X86MCAsmInfoMicrosoft::anchor() { }
+
+X86MCAsmInfoMicrosoft::X86MCAsmInfoMicrosoft(const Triple &Triple) {
+  if (Triple.getArch() == Triple::x86_64) {
+    PrivateGlobalPrefix = ".L";
+    PointerSize = 8;
+    WinEHEncodingType = WinEH::EncodingType::Itanium;
+    ExceptionsType = ExceptionHandling::WinEH;
+  }
+
+  AssemblerDialect = AsmWriterFlavor;
+
+  TextAlignFillValue = 0x90;
+
+  AllowAtInName = true;
+
+  UseIntegratedAssembler = true;
 }
 
-X86MCAsmInfoCOFF::X86MCAsmInfoCOFF(const Triple &Triple) {
+void X86MCAsmInfoGNUCOFF::anchor() { }
+
+X86MCAsmInfoGNUCOFF::X86MCAsmInfoGNUCOFF(const Triple &Triple) {
+  assert(Triple.isOSWindows() && "Windows is the only supported COFF target");
   if (Triple.getArch() == Triple::x86_64) {
-    GlobalPrefix = "";
     PrivateGlobalPrefix = ".L";
+    PointerSize = 8;
+    WinEHEncodingType = WinEH::EncodingType::Itanium;
+    ExceptionsType = ExceptionHandling::WinEH;
+  } else {
+    ExceptionsType = ExceptionHandling::DwarfCFI;
   }
 
-  AsmTransCBE = x86_asm_table;
   AssemblerDialect = AsmWriterFlavor;
 
   TextAlignFillValue = 0x90;
+
+  UseIntegratedAssembler = true;
 }