LLVM 19.0.0git
X86MCAsmInfo.cpp
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1//===-- X86MCAsmInfo.cpp - X86 asm properties -----------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file contains the declarations of the X86MCAsmInfo properties.
10//
11//===----------------------------------------------------------------------===//
12
13#include "X86MCAsmInfo.h"
14#include "llvm/MC/MCExpr.h"
15#include "llvm/MC/MCStreamer.h"
18using namespace llvm;
19
21 // Note: This numbering has to match the GCC assembler dialects for inline
22 // asm alternatives to work right.
23 ATT = 0, Intel = 1
24};
25
27 "x86-asm-syntax", cl::init(ATT), cl::Hidden,
28 cl::desc("Choose style of code to emit from X86 backend:"),
29 cl::values(clEnumValN(ATT, "att", "Emit AT&T-style assembly"),
30 clEnumValN(Intel, "intel", "Emit Intel-style assembly")));
31
32static cl::opt<bool>
33MarkedJTDataRegions("mark-data-regions", cl::init(true),
34 cl::desc("Mark code section jump table data regions."),
36
37void X86MCAsmInfoDarwin::anchor() { }
38
40 bool is64Bit = T.getArch() == Triple::x86_64;
41 if (is64Bit)
43
45
46 TextAlignFillValue = 0x90;
47
48 if (!is64Bit)
49 Data64bitsDirective = nullptr; // we can't emit a 64-bit unit
50
51 // Use ## as a comment string so that .s files generated by llvm can go
52 // through the GCC preprocessor without causing an error. This is needed
53 // because "clang foo.s" runs the C preprocessor, which is usually reserved
54 // for .S files on other systems. Perhaps this is because the file system
55 // wasn't always case preserving or something.
56 CommentString = "##";
57
60
61 // Exceptions handling
63
64 // old assembler lacks some directives
65 // FIXME: this should really be a check on the assembler characteristics
66 // rather than OS version
67 if (T.isMacOSX() && T.isMacOSXVersionLT(10, 6))
69
70 // Assume ld64 is new enough that the abs-ified FDE relocs may be used
71 // (actually, must, since otherwise the non-extern relocations we produce
72 // overwhelm ld64's tiny little mind and it fails).
74}
75
78}
79
80void X86ELFMCAsmInfo::anchor() { }
81
83 bool is64Bit = T.getArch() == Triple::x86_64;
84 bool isX32 = T.isX32();
85
86 // For ELF, x86-64 pointer size depends on the ABI.
87 // For x86-64 without the x32 ABI, pointer size is 8. For x86 and for x86-64
88 // with the x32 ABI, pointer size remains the default 4.
89 CodePointerSize = (is64Bit && !isX32) ? 8 : 4;
90
91 // OTOH, stack slot size is always 8 for x86-64, even with the x32 ABI.
93
95
96 TextAlignFillValue = 0x90;
97
98 // Debug Information
100
101 // Exceptions handling
103}
104
105const MCExpr *
107 unsigned Encoding,
108 MCStreamer &Streamer) const {
109 MCContext &Context = Streamer.getContext();
110 const MCExpr *Res =
112 const MCExpr *Four = MCConstantExpr::create(4, Context);
113 return MCBinaryExpr::createAdd(Res, Four, Context);
114}
115
116void X86MCAsmInfoMicrosoft::anchor() { }
117
119 if (Triple.getArch() == Triple::x86_64) {
120 PrivateGlobalPrefix = ".L";
121 PrivateLabelPrefix = ".L";
122 CodePointerSize = 8;
124 } else {
125 // 32-bit X86 doesn't use CFI, so this isn't a real encoding type. It's just
126 // a place holder that the Windows EHStreamer looks for to suppress CFI
127 // output. In particular, usesWindowsCFI() returns false.
129 }
130
132
134
135 TextAlignFillValue = 0x90;
136
137 AllowAtInName = true;
138}
139
140void X86MCAsmInfoMicrosoftMASM::anchor() { }
141
144 DollarIsPC = true;
145 SeparatorString = "\n";
146 CommentString = ";";
151}
152
153void X86MCAsmInfoGNUCOFF::anchor() { }
154
157 "Windows and UEFI are the only supported COFF targets");
158 if (Triple.getArch() == Triple::x86_64) {
159 PrivateGlobalPrefix = ".L";
160 PrivateLabelPrefix = ".L";
161 CodePointerSize = 8;
164 } else {
166 }
167
169
170 TextAlignFillValue = 0x90;
171
172 AllowAtInName = true;
173}
#define clEnumValN(ENUMVAL, FLAGNAME, DESC)
Definition: CommandLine.h:693
Symbol * Sym
Definition: ELF_riscv.cpp:479
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
static bool is64Bit(const char *name)
static cl::opt< AsmWriterFlavorTy > AsmWriterFlavor("x86-asm-syntax", cl::init(ATT), cl::Hidden, 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")))
static cl::opt< bool > MarkedJTDataRegions("mark-data-regions", cl::init(true), cl::desc("Mark code section jump table data regions."), cl::Hidden)
AsmWriterFlavorTy
@ Intel
@ ATT
bool AllowAdditionalComments
This indicates whether to allow additional "comment strings" to be lexed as a comment.
Definition: MCAsmInfo.h:147
unsigned TextAlignFillValue
If non-zero, this is used to fill the executable space created as the result of a alignment directive...
Definition: MCAsmInfo.h:336
bool AllowQuestionAtStartOfIdentifier
This is true if the assembler allows the "?" character at the start of of a string to be lexed as an ...
Definition: MCAsmInfo.h:204
const char * Data64bitsDirective
Definition: MCAsmInfo.h:291
bool DollarIsPC
The '$' token, when not referencing an identifier or constant, refers to the current PC.
Definition: MCAsmInfo.h:119
ExceptionHandling ExceptionsType
Exception handling format for the target. Defaults to None.
Definition: MCAsmInfo.h:457
bool AllowDollarAtStartOfIdentifier
This is true if the assembler allows the "$" character at the start of of a string to be lexed as an ...
Definition: MCAsmInfo.h:211
StringRef PrivateGlobalPrefix
This prefix is used for globals like constant pool entries that are completely private to the ....
Definition: MCAsmInfo.h:168
bool DwarfFDESymbolsUseAbsDiff
True if DWARF FDE symbol reference relocations should be replaced by an absolute difference.
Definition: MCAsmInfo.h:472
bool AllowAtAtStartOfIdentifier
This is true if the assembler allows the "@" character at the start of a string to be lexed as an Asm...
Definition: MCAsmInfo.h:218
WinEH::EncodingType WinEHEncodingType
Windows exception handling data (.pdata) encoding. Defaults to Invalid.
Definition: MCAsmInfo.h:464
StringRef PrivateLabelPrefix
This prefix is used for labels for basic blocks.
Definition: MCAsmInfo.h:172
bool AllowAtInName
This is true if the assembler allows @ characters in symbol names.
Definition: MCAsmInfo.h:197
bool HasWeakDefCanBeHiddenDirective
True if we have a directive to declare a global as being a weak defined symbol that can be hidden (un...
Definition: MCAsmInfo.h:425
bool SupportsDebugInformation
True if target supports emission of debugging information.
Definition: MCAsmInfo.h:454
unsigned AssemblerDialect
Which dialect of an assembler variant to use. Defaults to 0.
Definition: MCAsmInfo.h:193
const char * SeparatorString
This string, if specified, is used to separate instructions from each other when on the same line.
Definition: MCAsmInfo.h:131
bool UseDataRegionDirectives
This is true if data region markers should be printed as ".data_region/.end_data_region" directives.
Definition: MCAsmInfo.h:234
unsigned CodePointerSize
Code pointer size in bytes. Default is 4.
Definition: MCAsmInfo.h:72
unsigned CalleeSaveStackSlotSize
Size of the stack slot reserved for callee-saved registers, in bytes.
Definition: MCAsmInfo.h:76
StringRef CommentString
This indicates the comment string used by the assembler.
Definition: MCAsmInfo.h:135
static const MCBinaryExpr * createAdd(const MCExpr *LHS, const MCExpr *RHS, MCContext &Ctx)
Definition: MCExpr.h:536
static const MCConstantExpr * create(int64_t Value, MCContext &Ctx, bool PrintInHex=false, unsigned SizeInBytes=0)
Definition: MCExpr.cpp:194
Context object for machine code objects.
Definition: MCContext.h:82
Base class for the full range of assembler expressions which are needed for parsing.
Definition: MCExpr.h:35
Streaming machine code generation interface.
Definition: MCStreamer.h:212
MCContext & getContext() const
Definition: MCStreamer.h:297
static const MCSymbolRefExpr * create(const MCSymbol *Symbol, MCContext &Ctx)
Definition: MCExpr.h:397
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:40
Triple - Helper class for working with autoconf configuration names.
Definition: Triple.h:44
ArchType getArch() const
Get the parsed architecture type of this triple.
Definition: Triple.h:373
bool isUEFI() const
Tests whether the OS is UEFI.
Definition: Triple.h:619
bool isOSWindows() const
Tests whether the OS is Windows.
Definition: Triple.h:624
X86ELFMCAsmInfo(const Triple &Triple)
X86MCAsmInfoDarwin(const Triple &Triple)
X86MCAsmInfoGNUCOFF(const Triple &Triple)
X86MCAsmInfoMicrosoftMASM(const Triple &Triple)
X86MCAsmInfoMicrosoft(const Triple &Triple)
@ Itanium
Windows CE ARM, PowerPC, SH3, SH4.
@ X86
Windows x64, Windows Itanium (IA-64)
ValuesClass values(OptsTy... Options)
Helper to build a ValuesClass by forwarding a variable number of arguments as an initializer list to ...
Definition: CommandLine.h:718
initializer< Ty > init(const Ty &Val)
Definition: CommandLine.h:450
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
@ DwarfCFI
DWARF-like instruction based exceptions.
@ WinEH
Windows Exception Handling.
const MCExpr * getExprForPersonalitySymbol(const MCSymbol *Sym, unsigned Encoding, MCStreamer &Streamer) const override
X86_64MCAsmInfoDarwin(const Triple &Triple)