#include "llvm/MC/MCDirectives.h"
#include "llvm/MC/MCDwarf.h"
-#include "llvm/MC/MachineLocation.h"
#include <cassert>
#include <vector>
class MCSymbol;
class MCContext;
-namespace ExceptionHandling {
-enum ExceptionsType { None, DwarfCFI, SjLj, ARM, Win64 };
+namespace WinEH {
+enum class EncodingType {
+ Invalid, /// Invalid
+ Alpha, /// Windows Alpha
+ Alpha64, /// Windows AXP64
+ ARM, /// Windows NT (Windows on ARM)
+ CE, /// Windows CE ARM, PowerPC, SH3, SH4
+ Itanium, /// Windows x64, Windows Itanium (IA-64)
+ X86, /// Windows x86, uses no CFI, just EH tables
+ MIPS = Alpha,
+};
}
+enum class ExceptionHandling {
+ None, /// No exception support
+ DwarfCFI, /// DWARF-like instruction based exceptions
+ SjLj, /// setjmp/longjmp based exceptions
+ ARM, /// ARM EHABI
+ WinEH, /// Windows Exception Handling
+};
+
namespace LCOMM {
enum LCOMMType { NoAlignment, ByteAlignment, Log2Alignment };
}
bool HasMachoTBSSDirective;
/// True if the compiler should emit a ".reference .constructors_used" or
- /// ".reference .destructors_used" directive after the a static ctor/dtor
+ /// ".reference .destructors_used" directive after the static ctor/dtor
/// list. This directive is only emitted in Static relocation model. Default
/// is false.
bool HasStaticCtorDtorReferenceInStaticMode;
- /// True if the linker has a bug and requires that the debug_line section be
- /// of a minimum size. In practice such a linker requires a non-empty line
- /// sequence if a file is present. Default to false.
- bool LinkerRequiresNonEmptyDwarfLines;
-
/// This is the maximum possible length of an instruction, which is needed to
/// compute the size of an inline asm. Defaults to 4.
unsigned MaxInstLength;
/// This is appended to emitted labels. Defaults to ":"
const char *LabelSuffix;
- /// This is appended to emitted labels. Defaults to ":"
- const char *DebugLabelSuffix;
+ // Print the EH begin symbol with an assignment. Defaults to false.
+ bool UseAssignmentForEHBegin;
+
+ // Do we need to create a local symbol for .size?
+ bool NeedsLocalForSize;
/// This prefix is used for globals like constant pool entries that are
/// completely private to the .s file and should not have names in the .o
/// file. Defaults to "L"
const char *PrivateGlobalPrefix;
+ /// This prefix is used for labels for basic blocks. Defaults to the same as
+ /// PrivateGlobalPrefix.
+ const char *PrivateLabelPrefix;
+
/// This prefix is used for symbols that should be passed through the
/// assembler but be removed by the linker. This is 'l' on Darwin, currently
/// used for some ObjC metadata. The default of "" meast that for this system
/// Defaults to false.
bool AllowAtInName;
+ /// If this is true, symbol names with invalid characters will be printed in
+ /// quotes.
+ bool SupportsQuotedNames;
+
/// This is true if data region markers should be printed as
/// ".data_region/.end_data_region" directives. If false, use "$d/$a" labels
/// instead.
//===--- Global Variable Emission Directives --------------------------===//
- /// This is the directive used to declare a global entity. Defaults to NULL.
+ /// This is the directive used to declare a global entity. Defaults to
+ /// ".globl".
const char *GlobalDirective;
- /// True if the assembler supports the .set directive. Defaults to true.
- bool HasSetDirective;
+ /// True if the expression
+ /// .long f - g
+ /// uses a relocation but it can be suppressed by writing
+ /// a = f - g
+ /// .long a
+ bool SetDirectiveSuppressesReloc;
/// False if the assembler requires that we use
/// \code
/// argument and how it is interpreted. Defaults to NoAlignment.
LCOMM::LCOMMType LCOMMDirectiveAlignmentType;
+ // True if the target allows .align directives on functions. This is true for
+ // most targets, so defaults to true.
+ bool HasFunctionAlignment;
+
/// True if the target has .type and .size directives, this is true for most
/// ELF targets. Defaults to true.
bool HasDotTypeDotSizeDirective;
/// to false.
bool HasNoDeadStrip;
+ /// Used to declare a global as being a weak symbol. Defaults to ".weak".
+ const char *WeakDirective;
+
/// This directive, if non-null, is used to declare a global as being a weak
/// undefined symbol. Defaults to NULL.
const char *WeakRefDirective;
//===--- Dwarf Emission Directives -----------------------------------===//
- /// True if target asm supports leb128 directives. Defaults to false.
- bool HasLEB128;
-
/// True if target supports emission of debugging information. Defaults to
/// false.
bool SupportsDebugInformation;
- /// True if target supports exception handling. Defaults to None
- ExceptionHandling::ExceptionsType ExceptionsType;
+ /// Exception handling format for the target. Defaults to None.
+ ExceptionHandling ExceptionsType;
+
+ /// Windows exception handling data (.pdata) encoding. Defaults to Invalid.
+ WinEH::EncodingType WinEHEncodingType;
/// True if Dwarf2 output generally uses relocations for references to other
/// .debug_* sections.
std::vector<MCCFIInstruction> InitialFrameState;
- //===--- Integrated Assembler State ----------------------------------===//
+ //===--- Integrated Assembler Information ----------------------------===//
/// Should we use the integrated assembler?
/// The integrated assembler should be enabled by default (by the
/// Compress DWARF debug sections. Defaults to false.
bool CompressDebugSections;
+ /// True if the integrated assembler should interpret 'a >> b' constant
+ /// expressions as logical rather than arithmetic.
+ bool UseLogicalShr;
+
public:
explicit MCAsmInfo();
virtual ~MCAsmInfo();
/// Targets can implement this method to specify a section to switch to if the
/// translation unit doesn't have any trampolines that require an executable
/// stack.
- virtual const MCSection *getNonexecutableStackSection(MCContext &Ctx) const {
+ virtual MCSection *getNonexecutableStackSection(MCContext &Ctx) const {
return nullptr;
}
+ /// \brief True if the section is atomized using the symbols in it.
+ /// This is false if the section is not atomized at all (most ELF sections) or
+ /// if it is atomized based on its contents (MachO' __TEXT,__cstring for
+ /// example).
+ virtual bool isSectionAtomizableBySymbols(const MCSection &Section) const;
+
virtual const MCExpr *getExprForPersonalitySymbol(const MCSymbol *Sym,
unsigned Encoding,
MCStreamer &Streamer) const;
unsigned Encoding,
MCStreamer &Streamer) const;
+ /// Return true if the identifier \p Name does not need quotes to be
+ /// syntactically correct.
+ virtual bool isValidUnquotedName(StringRef Name) const;
+
+ /// Return true if the .section directive should be omitted when
+ /// emitting \p SectionName. For example:
+ ///
+ /// shouldOmitSectionDirective(".text")
+ ///
+ /// returns false => .section .text,#alloc,#execinstr
+ /// returns true => .text
+ virtual bool shouldOmitSectionDirective(StringRef SectionName) const;
+
bool usesSunStyleELFSectionSwitchSyntax() const {
return SunStyleELFSectionSwitchSyntax;
}
bool hasStaticCtorDtorReferenceInStaticMode() const {
return HasStaticCtorDtorReferenceInStaticMode;
}
- bool getLinkerRequiresNonEmptyDwarfLines() const {
- return LinkerRequiresNonEmptyDwarfLines;
- }
unsigned getMaxInstLength() const { return MaxInstLength; }
unsigned getMinInstAlignment() const { return MinInstAlignment; }
bool getDollarIsPC() const { return DollarIsPC; }
const char *getCommentString() const { return CommentString; }
const char *getLabelSuffix() const { return LabelSuffix; }
- const char *getDebugLabelSuffix() const { return DebugLabelSuffix; }
+ bool useAssignmentForEHBegin() const { return UseAssignmentForEHBegin; }
+ bool needsLocalForSize() const { return NeedsLocalForSize; }
const char *getPrivateGlobalPrefix() const { return PrivateGlobalPrefix; }
+ const char *getPrivateLabelPrefix() const { return PrivateLabelPrefix; }
bool hasLinkerPrivateGlobalPrefix() const {
return LinkerPrivateGlobalPrefix[0] != '\0';
}
const char *getCode64Directive() const { return Code64Directive; }
unsigned getAssemblerDialect() const { return AssemblerDialect; }
bool doesAllowAtInName() const { return AllowAtInName; }
+ bool supportsNameQuoting() const { return SupportsQuotedNames; }
bool doesSupportDataRegionDirectives() const {
return UseDataRegionDirectives;
}
bool getAlignmentIsInBytes() const { return AlignmentIsInBytes; }
unsigned getTextAlignFillValue() const { return TextAlignFillValue; }
const char *getGlobalDirective() const { return GlobalDirective; }
- bool hasSetDirective() const { return HasSetDirective; }
+ bool doesSetDirectiveSuppressesReloc() const {
+ return SetDirectiveSuppressesReloc;
+ }
bool hasAggressiveSymbolFolding() const { return HasAggressiveSymbolFolding; }
bool getCOMMDirectiveAlignmentIsInBytes() const {
return COMMDirectiveAlignmentIsInBytes;
LCOMM::LCOMMType getLCOMMDirectiveAlignmentType() const {
return LCOMMDirectiveAlignmentType;
}
+ bool hasFunctionAlignment() const { return HasFunctionAlignment; }
bool hasDotTypeDotSizeDirective() const { return HasDotTypeDotSizeDirective; }
bool hasSingleParameterDotFile() const { return HasSingleParameterDotFile; }
bool hasIdentDirective() const { return HasIdentDirective; }
bool hasNoDeadStrip() const { return HasNoDeadStrip; }
+ const char *getWeakDirective() const { return WeakDirective; }
const char *getWeakRefDirective() const { return WeakRefDirective; }
bool hasWeakDefDirective() const { return HasWeakDefDirective; }
bool hasWeakDefCanBeHiddenDirective() const {
MCSymbolAttr getProtectedVisibilityAttr() const {
return ProtectedVisibilityAttr;
}
- bool hasLEB128() const { return HasLEB128; }
bool doesSupportDebugInformation() const { return SupportsDebugInformation; }
bool doesSupportExceptionHandling() const {
return ExceptionsType != ExceptionHandling::None;
}
- ExceptionHandling::ExceptionsType getExceptionHandlingType() const {
- return ExceptionsType;
- }
- bool isExceptionHandlingDwarf() const {
+ ExceptionHandling getExceptionHandlingType() const { return ExceptionsType; }
+ WinEH::EncodingType getWinEHEncodingType() const { return WinEHEncodingType; }
+
+ /// Returns true if the exception handling method for the platform uses call
+ /// frame information to unwind.
+ bool usesCFIForEH() const {
return (ExceptionsType == ExceptionHandling::DwarfCFI ||
- ExceptionsType == ExceptionHandling::ARM ||
- ExceptionsType == ExceptionHandling::Win64);
+ ExceptionsType == ExceptionHandling::ARM || usesWindowsCFI());
+ }
+
+ bool usesWindowsCFI() const {
+ return ExceptionsType == ExceptionHandling::WinEH &&
+ (WinEHEncodingType != WinEH::EncodingType::Invalid &&
+ WinEHEncodingType != WinEH::EncodingType::X86);
}
+
bool doesDwarfUseRelocationsAcrossSections() const {
return DwarfUsesRelocationsAcrossSections;
}
void setCompressDebugSections(bool CompressDebugSections) {
this->CompressDebugSections = CompressDebugSections;
}
+
+ bool shouldUseLogicalShr() const { return UseLogicalShr; }
};
}
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