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resolve a fixme: the "nonexecutable stack directive" is actually

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a .section.  Switch to it with SwitchSection.

However, I think that this directive should be safe on any ELF target.
If so, we should hoist it up out of the X86 and SystemZ targets.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94298 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-01-23 07:21:06 +00:00
parent 74670b26fc
commit f9f93e4388
9 changed files with 35 additions and 26 deletions
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29
include/llvm/MC/MCAsmInfo.h
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@@ -20,6 +20,9 @@
#include <cassert>
namespace llvm {
class MCSection;
class MCContext;
/// MCAsmInfo - This class is intended to be used as a base class for asm
/// properties and features specific to the target.
namespace ExceptionHandling { enum ExceptionsType { None, Dwarf, SjLj }; }
@@ -30,11 +33,10 @@ namespace llvm {
// Properties to be set by the target writer, used to configure asm printer.
//
/// NonexecutableStackDirective - Directive for declaring to the
/// linker and beyond that the emitted code does not require stack
/// memory to be executable.
const char *NonexecutableStackDirective; // Default is null.
/// HasSubsectionsViaSymbols - True if this target has the MachO
/// .subsections_via_symbols directive.
bool HasSubsectionsViaSymbols; // Default is false.
/// HasMachoZeroFillDirective - True if this is a MachO target that supports
/// the macho-specific .zerofill directive for emitting BSS Symbols.
bool HasMachoZeroFillDirective; // Default is false.
@@ -288,14 +290,12 @@ namespace llvm {
explicit MCAsmInfo();
virtual ~MCAsmInfo();
/// getSLEB128Size - Compute the number of bytes required for a signed
/// leb128 value.
// FIXME: move these methods to DwarfPrinter when the JIT stops using them.
static unsigned getSLEB128Size(int Value);
/// getULEB128Size - Compute the number of bytes required for an unsigned
/// leb128 value.
static unsigned getULEB128Size(unsigned Value);
bool hasSubsectionsViaSymbols() const { return HasSubsectionsViaSymbols; }
// Data directive accessors.
//
const char *getData8bitsDirective(unsigned AS = 0) const {
@@ -311,6 +311,12 @@ namespace llvm {
return AS == 0 ? Data64bitsDirective : getDataASDirective(64, AS);
}
/// getNonexecutableStackSection - 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 MCSection *getNonexecutableStackSection(MCContext &Ctx) const {
return 0;
}
bool usesSunStyleELFSectionSwitchSyntax() const {
return SunStyleELFSectionSwitchSyntax;
@@ -326,9 +332,6 @@ namespace llvm {
bool hasStaticCtorDtorReferenceInStaticMode() const {
return HasStaticCtorDtorReferenceInStaticMode;
}
const char *getNonexecutableStackDirective() const {
return NonexecutableStackDirective;
}
bool needsSet() const {
return NeedsSet;
}