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Add a InitSections method to the streamer interface. 

The ELF implementation now creates text, data and bss to match the gnu as
behavior.

The text streamer still has the old MachO specific behavior since
the testsuite checks that it will error when a directive is given
before a setting the current section for example.

A nice benefit is that -n is not required anymore when producing
ELF files.

llvm-svn: 114027
This commit is contained in:
Rafael Espindola 2010-09-15 21:48:40 +00:00
parent 44857a38fa
commit f667d929ce
13 changed files with 116 additions and 13 deletions
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3
llvm/include/llvm/MC/MCStreamer.h
View File

@ -110,6 +110,9 @@ namespace llvm {
/// This corresponds to assembler directives like .section, .text, etc.
virtual void SwitchSection(const MCSection *Section) = 0;
/// InitSections - Create the default sections and set the initial one.
virtual void InitSections() = 0;
/// EmitLabel - Emit a label for @p Symbol into the current section.
///
/// This corresponds to an assembler statement such as:

8
llvm/lib/MC/MCAsmStreamer.cpp
View File

@ -100,6 +100,14 @@ public:
virtual void SwitchSection(const MCSection *Section);
virtual void InitSections() {
// FIXME, this is MachO specific, but the testsuite
// expects this.
SwitchSection(getContext().getMachOSection("__TEXT", "__text",
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
0, SectionKind::getText()));
}
virtual void EmitLabel(MCSymbol *Symbol);
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);

2
llvm/lib/MC/MCAssembler.cpp
View File

@ -739,7 +739,7 @@ void MCAssembler::Finish(MCObjectWriter *Writer) {
// Create dummy fragments to eliminate any empty sections, this simplifies
// layout.
if (it->getFragmentList().empty())
new MCFillFragment(0, 1, 0, it);
new MCDataFragment(it);
it->setOrdinal(SectionIndex++);
}

33
llvm/lib/MC/MCELFStreamer.cpp
View File

@ -46,6 +46,7 @@ public:
/// @name MCStreamer Interface
/// @{
virtual void InitSections();
virtual void EmitLabel(MCSymbol *Symbol);
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
@ -109,10 +110,42 @@ public:
virtual void Finish();
/// @}
void SetSection(StringRef Section, unsigned Type, unsigned Flags,
SectionKind Kind) {
SwitchSection(getContext().getELFSection(Section, Type, Flags, Kind));
}
void SetSectionData() {
SetSection(".data", MCSectionELF::SHT_PROGBITS,
MCSectionELF::SHF_WRITE |MCSectionELF::SHF_ALLOC,
SectionKind::getDataRel());
EmitCodeAlignment(4, 0);
}
void SetSectionText() {
SetSection(".text", MCSectionELF::SHT_PROGBITS,
MCSectionELF::SHF_EXECINSTR |
MCSectionELF::SHF_ALLOC, SectionKind::getText());
EmitCodeAlignment(4, 0);
}
void SetSectionBss() {
SetSection(".bss", MCSectionELF::SHT_NOBITS,
MCSectionELF::SHF_WRITE |
MCSectionELF::SHF_ALLOC, SectionKind::getBSS());
EmitCodeAlignment(4, 0);
}
};
} // end anonymous namespace.
void MCELFStreamer::InitSections() {
// This emulates the same behavior of GNU as. This makes it easier
// to compare the output as the major sections are in the same order.
SetSectionText();
SetSectionData();
SetSectionBss();
SetSectionText();
}
void MCELFStreamer::EmitLabel(MCSymbol *Symbol) {
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");

4
llvm/lib/MC/MCLoggingStreamer.cpp
View File

@ -54,6 +54,10 @@ public:
return Child->SwitchSection(Section);
}
virtual void InitSections() {
LogCall("InitSections");
}
virtual void EmitLabel(MCSymbol *Symbol) {
LogCall("EmitLabel");
return Child->EmitLabel(Symbol);

8
llvm/lib/MC/MCMachOStreamer.cpp
View File

@ -46,6 +46,7 @@ public:
/// @name MCStreamer Interface
/// @{
virtual void InitSections();
virtual void EmitLabel(MCSymbol *Symbol);
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
@ -110,6 +111,13 @@ public:
} // end anonymous namespace.
void MCMachOStreamer::InitSections() {
SwitchSection(getContext().getMachOSection("__TEXT", "__text",
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
0, SectionKind::getText()));
}
void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
// TODO: This is almost exactly the same as WinCOFFStreamer. Consider merging
// into MCObjectStreamer.

3
llvm/lib/MC/MCNullStreamer.cpp
View File

@ -25,6 +25,9 @@ namespace {
/// @name MCStreamer Interface
/// @{
virtual void InitSections() {
}
virtual void SwitchSection(const MCSection *Section) {
PrevSection = CurSection;
CurSection = Section;

6
llvm/lib/MC/MCParser/AsmParser.cpp
View File

@ -365,12 +365,8 @@ const AsmToken &AsmParser::Lex() {
bool AsmParser::Run(bool NoInitialTextSection, bool NoFinalize) {
// Create the initial section, if requested.
//
// FIXME: Target hook & command line option for initial section.
if (!NoInitialTextSection)
Out.SwitchSection(Ctx.getMachOSection("__TEXT", "__text",
MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
0, SectionKind::getText()));
Out.InitSections();
// Prime the lexer.
Lex();

14
llvm/lib/MC/MCParser/ELFAsmParser.cpp
View File

@ -51,20 +51,28 @@ public:
AddDirectiveHandler<&ELFAsmParser::ParseDirectivePrevious>(".previous");
}
// FIXME: Part of this logic is duplicated in the MCELFStreamer. What is
// the best way for us to get access to it?
bool ParseSectionDirectiveData(StringRef, SMLoc) {
return ParseSectionSwitch(".data", MCSectionELF::SHT_PROGBITS,
bool ret = ParseSectionSwitch(".data", MCSectionELF::SHT_PROGBITS,
MCSectionELF::SHF_WRITE |MCSectionELF::SHF_ALLOC,
SectionKind::getDataRel());
getStreamer().EmitCodeAlignment(4, 0);
return ret;
}
bool ParseSectionDirectiveText(StringRef, SMLoc) {
return ParseSectionSwitch(".text", MCSectionELF::SHT_PROGBITS,
bool ret = ParseSectionSwitch(".text", MCSectionELF::SHT_PROGBITS,
MCSectionELF::SHF_EXECINSTR |
MCSectionELF::SHF_ALLOC, SectionKind::getText());
getStreamer().EmitCodeAlignment(4, 0);
return ret;
}
bool ParseSectionDirectiveBSS(StringRef, SMLoc) {
return ParseSectionSwitch(".bss", MCSectionELF::SHT_NOBITS,
bool ret = ParseSectionSwitch(".bss", MCSectionELF::SHT_NOBITS,
MCSectionELF::SHF_WRITE |
MCSectionELF::SHF_ALLOC, SectionKind::getBSS());
getStreamer().EmitCodeAlignment(4, 0);
return ret;
}
bool ParseSectionDirectiveRoData(StringRef, SMLoc) {
return ParseSectionSwitch(".rodata", MCSectionELF::SHT_PROGBITS,

4
llvm/lib/MC/WinCOFFStreamer.cpp
View File

@ -48,6 +48,7 @@ public:
// MCStreamer interface
virtual void InitSections();
virtual void EmitLabel(MCSymbol *Symbol);
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
@ -126,6 +127,9 @@ void WinCOFFStreamer::AddCommonSymbol(MCSymbol *Symbol, uint64_t Size,
// MCStreamer interface
void WinCOFFStreamer::InitSections() {
}
void WinCOFFStreamer::EmitLabel(MCSymbol *Symbol) {
// TODO: This is copied almost exactly from the MachOStreamer. Consider
// merging into MCObjectStreamer?

36
llvm/test/MC/ELF/empty.s Normal file
View File

@ -0,0 +1,36 @@
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump | FileCheck %s
// Test that like gnu as we create text, data and bss by default.
// CHECK: ('sh_name', 1) # '.text'
// CHECK-NEXT: ('sh_type', 1)
// CHECK-NEXT: ('sh_flags', 6)
// CHECK-NEXT: ('sh_addr', 0)
// CHECK-NEXT: ('sh_offset', 64)
// CHECK-NEXT: ('sh_size', 0)
// CHECK-NEXT: ('sh_link', 0)
// CHECK-NEXT: ('sh_info', 0)
// CHECK-NEXT: ('sh_addralign', 4)
// CHECK-NEXT: ('sh_entsize', 0)
// CHECK: ('sh_name', 7) # '.data'
// CHECK-NEXT: ('sh_type', 1)
// CHECK-NEXT: ('sh_flags', 3)
// CHECK-NEXT: ('sh_addr', 0)
// CHECK-NEXT: ('sh_offset', 64)
// CHECK-NEXT: ('sh_size', 0)
// CHECK-NEXT: ('sh_link', 0)
// CHECK-NEXT: ('sh_info', 0)
// CHECK-NEXT: ('sh_addralign', 4)
// CHECK-NEXT: ('sh_entsize', 0)
// CHECK: ('sh_name', 13) # '.bss'
// CHECK-NEXT: ('sh_type', 8)
// CHECK-NEXT: ('sh_flags', 3)
// CHECK-NEXT: ('sh_addr', 0)
// CHECK-NEXT: ('sh_offset', 64)
// CHECK-NEXT: ('sh_size', 0)
// CHECK-NEXT: ('sh_link', 0)
// CHECK-NEXT: ('sh_info', 0)
// CHECK-NEXT: ('sh_addralign', 4)
// CHECK-NEXT: ('sh_entsize', 0)

4
llvm/test/MC/ELF/sleb.s
View File

@ -1,5 +1,5 @@
// RUN: llvm-mc -filetype=obj -triple i686-pc-linux-gnu -n %s -o - | elf-dump --dump-section-data | FileCheck -check-prefix=ELF_32 %s
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu -n %s -o - | elf-dump --dump-section-data | FileCheck -check-prefix=ELF_64 %s
// RUN: llvm-mc -filetype=obj -triple i686-pc-linux-gnu %s -o - | elf-dump --dump-section-data | FileCheck -check-prefix=ELF_32 %s
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump --dump-section-data | FileCheck -check-prefix=ELF_64 %s
// RUN: llvm-mc -filetype=obj -triple i386-apple-darwin9 %s -o - | macho-dump --dump-section-data | FileCheck -check-prefix=MACHO_32 %s
// RUN: llvm-mc -filetype=obj -triple x86_64-apple-darwin9 %s -o - | macho-dump --dump-section-data | FileCheck -check-prefix=MACHO_64 %s

4
llvm/test/MC/ELF/uleb.s
View File

@ -1,5 +1,5 @@
// RUN: llvm-mc -filetype=obj -triple i686-pc-linux-gnu -n %s -o - | elf-dump --dump-section-data | FileCheck -check-prefix=ELF_32 %s
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu -n %s -o - | elf-dump --dump-section-data | FileCheck -check-prefix=ELF_64 %s
// RUN: llvm-mc -filetype=obj -triple i686-pc-linux-gnu %s -o - | elf-dump --dump-section-data | FileCheck -check-prefix=ELF_32 %s
// RUN: llvm-mc -filetype=obj -triple x86_64-pc-linux-gnu %s -o - | elf-dump --dump-section-data | FileCheck -check-prefix=ELF_64 %s
// RUN: llvm-mc -filetype=obj -triple i386-apple-darwin9 %s -o - | macho-dump --dump-section-data | FileCheck -check-prefix=MACHO_32 %s
// RUN: llvm-mc -filetype=obj -triple x86_64-apple-darwin9 %s -o - | macho-dump --dump-section-data | FileCheck -check-prefix=MACHO_64 %s