llvm-6502/lib/Target/X86/MCTargetDesc/X86MCAsmInfo.cpp
Eli Bendersky 9dd2a3b1f2 Initial patch for x32 ABI support.
Add the x32 environment kind to the triple, and separate the concept of
pointer size and callee save stack slot size, since they're not equal
on x32.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@173175 91177308-0d34-0410-b5e6-96231b3b80d8
2013-01-22 18:02:49 +00:00

159 lines
4.9 KiB
C++

//===-- X86MCAsmInfo.cpp - X86 asm properties -----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declarations of the X86MCAsmInfo properties.
//
//===----------------------------------------------------------------------===//
#include "X86MCAsmInfo.h"
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ELF.h"
using namespace llvm;
enum AsmWriterFlavorTy {
// Note: This numbering has to match the GCC assembler dialects for inline
// asm alternatives to work right.
ATT = 0, Intel = 1
};
static cl::opt<AsmWriterFlavorTy>
AsmWriterFlavor("x86-asm-syntax", cl::init(ATT),
cl::desc("Choose style of code to emit from X86 backend:"),
cl::values(clEnumValN(ATT, "att", "Emit AT&T-style assembly"),
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);
void X86MCAsmInfoDarwin::anchor() { }
X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &T) {
bool is64Bit = T.getArch() == Triple::x86_64;
if (is64Bit)
PointerSize = CalleeSaveStackSlotSize = 8;
AssemblerDialect = AsmWriterFlavor;
TextAlignFillValue = 0x90;
if (!is64Bit)
Data64bitsDirective = 0; // 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
// because "clang foo.s" runs the C preprocessor, which is usually reserved
// 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;
}
X86_64MCAsmInfoDarwin::X86_64MCAsmInfoDarwin(const Triple &Triple)
: X86MCAsmInfoDarwin(Triple) {
}
void X86ELFMCAsmInfo::anchor() { }
X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
bool is64Bit = T.getArch() == Triple::x86_64;
bool isX32 = T.getEnvironment() == Triple::GNUX32;
// 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;
// OTOH, stack slot size is always 8 for x86-64, even with the x32 ABI.
CalleeSaveStackSlotSize = is64Bit ? 8 : 4;
AssemblerDialect = AsmWriterFlavor;
TextAlignFillValue = 0x90;
PrivateGlobalPrefix = ".L";
WeakRefDirective = "\t.weak\t";
PCSymbol = ".";
// Set up DWARF directives
HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
// Debug Information
SupportsDebugInformation = true;
// Exceptions handling
ExceptionsType = ExceptionHandling::DwarfCFI;
// 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 = 0;
}
const MCExpr *
X86_64MCAsmInfoDarwin::getExprForPersonalitySymbol(const MCSymbol *Sym,
unsigned Encoding,
MCStreamer &Streamer) const {
MCContext &Context = Streamer.getContext();
const MCExpr *Res =
MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOTPCREL, Context);
const MCExpr *Four = MCConstantExpr::Create(4, Context);
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) {
GlobalPrefix = "";
PrivateGlobalPrefix = ".L";
}
AssemblerDialect = AsmWriterFlavor;
TextAlignFillValue = 0x90;
}
void X86MCAsmInfoGNUCOFF::anchor() { }
X86MCAsmInfoGNUCOFF::X86MCAsmInfoGNUCOFF(const Triple &Triple) {
if (Triple.getArch() == Triple::x86_64) {
GlobalPrefix = "";
PrivateGlobalPrefix = ".L";
}
AssemblerDialect = AsmWriterFlavor;
TextAlignFillValue = 0x90;
// Exceptions handling
ExceptionsType = ExceptionHandling::DwarfCFI;
}