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Add hook in MCSection to decide when to use "optimized nops", for each

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section kind. Previously, optimized nops were only used for MachO.
Also added tests for ELF and COFF.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115523 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jan Wen Voung 2010-10-04 17:32:41 +00:00
parent 7a391832f4
commit 083cf1574f
13 changed files with 113 additions and 9 deletions
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4
include/llvm/MC/MCSection.h
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@ -61,6 +61,10 @@ namespace llvm {
return false;
}
// UseCodeAlign - Return true if a .align directive should use
// "optimized nops" to fill instead of 0s.
virtual bool UseCodeAlign() const = 0;
static bool classof(const MCSection *) { return true; }
};

1
include/llvm/MC/MCSectionCOFF.h
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@ -55,6 +55,7 @@ namespace llvm {
virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
raw_ostream &OS) const;
virtual bool UseCodeAlign() const;
static bool classof(const MCSection *S) {
return S->getVariant() == SV_COFF;

3
include/llvm/MC/MCSectionELF.h
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@ -178,7 +178,8 @@ public:
void PrintSwitchToSection(const MCAsmInfo &MAI,
raw_ostream &OS) const;
virtual bool UseCodeAlign() const;
/// isBaseAddressKnownZero - We know that non-allocatable sections (like
/// debug info) have a base of zero.
virtual bool isBaseAddressKnownZero() const {

1
include/llvm/MC/MCSectionMachO.h
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@ -165,6 +165,7 @@ public:
virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
raw_ostream &OS) const;
virtual bool UseCodeAlign() const;
static bool classof(const MCSection *S) {
return S->getVariant() == SV_MachO;

7
lib/MC/MCParser/AsmParser.cpp
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@ -1654,12 +1654,7 @@ bool AsmParser::ParseDirectiveAlign(bool IsPow2, unsigned ValueSize) {
// Check whether we should use optimal code alignment for this .align
// directive.
//
// FIXME: This should be using a target hook.
bool UseCodeAlign = false;
if (const MCSectionMachO *S = dyn_cast<MCSectionMachO>(
getStreamer().getCurrentSection()))
UseCodeAlign = S->hasAttribute(MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
bool UseCodeAlign = getStreamer().getCurrentSection()->UseCodeAlign();
if ((!HasFillExpr || Lexer.getMAI().getTextAlignFillValue() == FillExpr) &&
ValueSize == 1 && UseCodeAlign) {
getStreamer().EmitCodeAlignment(Alignment, MaxBytesToFill);

4
lib/MC/MCSectionCOFF.cpp
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@ -74,3 +74,7 @@ void MCSectionCOFF::PrintSwitchToSection(const MCAsmInfo &MAI,
}
}
}
bool MCSectionCOFF::UseCodeAlign() const {
return getKind().isText();
}

4
lib/MC/MCSectionELF.cpp
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@ -112,6 +112,10 @@ void MCSectionELF::PrintSwitchToSection(const MCAsmInfo &MAI,
OS << '\n';
}
bool MCSectionELF::UseCodeAlign() const {
return getFlags() & MCSectionELF::SHF_EXECINSTR;
}
// HasCommonSymbols - True if this section holds common symbols, this is
// indicated on the ELF object file by a symbol with SHN_COMMON section
// header index.

5
lib/MC/MCSectionMachO.cpp
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@ -148,6 +148,10 @@ void MCSectionMachO::PrintSwitchToSection(const MCAsmInfo &MAI,
OS << '\n';
}
bool MCSectionMachO::UseCodeAlign() const {
return hasAttribute(MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS);
}
/// StripSpaces - This removes leading and trailing spaces from the StringRef.
static void StripSpaces(StringRef &Str) {
while (!Str.empty() && isspace(Str[0]))
@ -283,4 +287,3 @@ std::string MCSectionMachO::ParseSectionSpecifier(StringRef Spec, // In.
return "";
}

4
lib/Target/PIC16/PIC16Section.cpp
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@ -102,3 +102,7 @@ void PIC16Section::PrintSwitchToSection(const MCAsmInfo &MAI,
OS << '\n';
}
bool PIC16Section::UseCodeAlign() const {
return isCODE_Type();
}

2
lib/Target/PIC16/PIC16Section.h
View File

@ -88,6 +88,8 @@ namespace llvm {
virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
raw_ostream &OS) const;
virtual bool UseCodeAlign() const;
static bool classof(const MCSection *S) {
return S->getVariant() == SV_PIC16;
}

45
test/MC/COFF/align-nops.s Normal file
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@ -0,0 +1,45 @@
// RUN: llvm-mc -filetype=obj -triple i686-pc-win32 %s -o %t
// RUN: coff-dump.py %abs_tmp | FileCheck %s
// Test that we get optimal nops in text
.text
f0:
.long 0
.align 8, 0x90
.long 0
.align 8
// But not in another section
.data
.long 0
.align 8, 0x90
.long 0
.align 8
//CHECK: Name = .text
//CHECK-NEXT: VirtualSize
//CHECK-NEXT: VirtualAddress
//CHECK-NEXT: SizeOfRawData = 16
//CHECK-NEXT: PointerToRawData
//CHECK-NEXT: PointerToRelocations
//CHECK-NEXT: PointerToLineNumbers
//CHECK-NEXT: NumberOfRelocations
//CHECK-NEXT: NumberOfLineNumbers
//CHECK-NEXT: Charateristics = 0x400001
//CHECK-NEXT: IMAGE_SCN_ALIGN_8BYTES
//CHECK-NEXT: SectionData =
//CHECK-NEXT: 00 00 00 00 0F 1F 40 00 - 00 00 00 00 0F 1F 40 00
//CHECK: Name = .data
//CHECK-NEXT: VirtualSize
//CHECK-NEXT: VirtualAddress
//CHECK-NEXT: SizeOfRawData = 16
//CHECK-NEXT: PointerToRawData
//CHECK-NEXT: PointerToRelocations
//CHECK-NEXT: PointerToLineNumbers
//CHECK-NEXT: NumberOfRelocations
//CHECK-NEXT: NumberOfLineNumbers
//CHECK-NEXT: Charateristics = 0x400001
//CHECK-NEXT: IMAGE_SCN_ALIGN_8BYTES
//CHECK-NEXT: SectionData =
//CHECK-NEXT: 00 00 00 00 90 90 90 90 - 00 00 00 00 00 00 00 00

2
test/MC/COFF/dg.exp
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@ -1,5 +1,5 @@
load_lib llvm.exp
if { [llvm_supports_target X86] } {
RunLLVMTests [lsort [glob -nocomplain $srcdir/$subdir/*.{ll}]]
RunLLVMTests [lsort [glob -nocomplain $srcdir/$subdir/*.{ll,s}]]
}

40
test/MC/ELF/align-nops.s Normal file
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@ -0,0 +1,40 @@
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump --dump-section-data | FileCheck %s
// Test that we get optimal nops in text
.text
f0:
.long 0
.align 8, 0x90
.long 0
.align 8
// But not in another section
.data
.long 0
.align 8, 0x90
.long 0
.align 8
// CHECK: (('sh_name', 1) # '.text'
// CHECK-NEXT: ('sh_type', 1)
// CHECK-NEXT: ('sh_flags', 6)
// CHECK-NEXT: ('sh_addr',
// CHECK-NEXT: ('sh_offset',
// CHECK-NEXT: ('sh_size', 16)
// CHECK-NEXT: ('sh_link', 0)
// CHECK-NEXT: ('sh_info', 0)
// CHECK-NEXT: ('sh_addralign', 8)
// CHECK-NEXT: ('sh_entsize', 0)
// CHECK-NEXT: ('_section_data', '00000000 0f1f4000 00000000 0f1f4000')
// CHECK: (('sh_name', 7) # '.data'
// CHECK-NEXT: ('sh_type', 1)
// CHECK-NEXT: ('sh_flags', 3)
// CHECK-NEXT: ('sh_addr',
// CHECK-NEXT: ('sh_offset',
// CHECK-NEXT: ('sh_size', 16)
// CHECK-NEXT: ('sh_link', 0)
// CHECK-NEXT: ('sh_info', 0)
// CHECK-NEXT: ('sh_addralign', 8)
// CHECK-NEXT: ('sh_entsize', 0)
// CHECK-NEXT: ('_section_data', '00000000 90909090 00000000 00000000')