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5d4918dbd1
foo = a - b .long foo instead of just .long a - b First, on darwin9 64 bits the assembler produces the wrong result. Second, if "a" is the end of the section all darwin assemblers (9, 10 and mc) will not consider a - b to be a constant but will if the dummy foo is created. Split how we handle these cases. The first one is something MC should take care of. The second one has to be handled by the caller. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120889 91177308-0d34-0410-b5e6-96231b3b80d8
118 lines
3.4 KiB
C++
118 lines
3.4 KiB
C++
//===-- X86MCAsmInfo.cpp - X86 asm properties -----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains the declarations of the X86MCAsmInfo properties.
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//
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//===----------------------------------------------------------------------===//
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#include "X86MCAsmInfo.h"
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#include "X86TargetMachine.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCSectionELF.h"
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#include "llvm/Support/CommandLine.h"
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using namespace llvm;
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enum AsmWriterFlavorTy {
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// Note: This numbering has to match the GCC assembler dialects for inline
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// asm alternatives to work right.
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ATT = 0, Intel = 1
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};
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static cl::opt<AsmWriterFlavorTy>
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AsmWriterFlavor("x86-asm-syntax", cl::init(ATT),
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cl::desc("Choose style of code to emit from X86 backend:"),
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cl::values(clEnumValN(ATT, "att", "Emit AT&T-style assembly"),
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clEnumValN(Intel, "intel", "Emit Intel-style assembly"),
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clEnumValEnd));
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static const char *const x86_asm_table[] = {
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"{si}", "S",
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"{di}", "D",
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"{ax}", "a",
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"{cx}", "c",
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"{memory}", "memory",
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"{flags}", "",
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"{dirflag}", "",
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"{fpsr}", "",
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"{cc}", "cc",
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0,0};
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X86MCAsmInfoDarwin::X86MCAsmInfoDarwin(const Triple &Triple) {
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AsmTransCBE = x86_asm_table;
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AssemblerDialect = AsmWriterFlavor;
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bool is64Bit = Triple.getArch() == Triple::x86_64;
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TextAlignFillValue = 0x90;
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if (!is64Bit)
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Data64bitsDirective = 0; // we can't emit a 64-bit unit
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// FIXME: Darwin 10 doesn't need this.
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if (is64Bit)
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NeedsSetToChangeDiffSize = true;
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// Use ## as a comment string so that .s files generated by llvm can go
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// through the GCC preprocessor without causing an error. This is needed
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// because "clang foo.s" runs the C preprocessor, which is usually reserved
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// for .S files on other systems. Perhaps this is because the file system
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// wasn't always case preserving or something.
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CommentString = "##";
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PCSymbol = ".";
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SupportsDebugInformation = true;
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DwarfUsesInlineInfoSection = true;
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// Exceptions handling
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ExceptionsType = ExceptionHandling::Dwarf;
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}
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X86ELFMCAsmInfo::X86ELFMCAsmInfo(const Triple &T) {
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AsmTransCBE = x86_asm_table;
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AssemblerDialect = AsmWriterFlavor;
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TextAlignFillValue = 0x90;
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PrivateGlobalPrefix = ".L";
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WeakRefDirective = "\t.weak\t";
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PCSymbol = ".";
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// Set up DWARF directives
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HasLEB128 = true; // Target asm supports leb128 directives (little-endian)
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// Debug Information
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SupportsDebugInformation = true;
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// Exceptions handling
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ExceptionsType = ExceptionHandling::Dwarf;
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// OpenBSD has buggy support for .quad in 32-bit mode, just split into two
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// .words.
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if (T.getOS() == Triple::OpenBSD && T.getArch() == Triple::x86)
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Data64bitsDirective = 0;
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}
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const MCSection *X86ELFMCAsmInfo::
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getNonexecutableStackSection(MCContext &Ctx) const {
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return Ctx.getELFSection(".note.GNU-stack", MCSectionELF::SHT_PROGBITS,
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0, SectionKind::getMetadata());
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}
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X86MCAsmInfoCOFF::X86MCAsmInfoCOFF(const Triple &Triple) {
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if (Triple.getArch() == Triple::x86_64)
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GlobalPrefix = "";
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AsmTransCBE = x86_asm_table;
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AssemblerDialect = AsmWriterFlavor;
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TextAlignFillValue = 0x90;
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}
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