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[mips] Implement custom MCELFStreamer. 

This allows us to insert some hooks before emitting data into an actual object file.
For example, we can capture the register usage for a translation unit by overriding
the EmitInstruction method. The register usage information is needed to generate
.reginfo and .Mips.options ELF sections.
    
No functional changes.
    
Differential Revision: http://llvm-reviews.chandlerc.com/D3129

llvm-svn: 204917
This commit is contained in:
Matheus Almeida 2014-03-27 11:39:03 +00:00
parent cb5ebf66df
commit dac77fb389
4 changed files with 66 additions and 1 deletions
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1
llvm/lib/Target/Mips/MCTargetDesc/CMakeLists.txt
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@ -1,6 +1,7 @@
add_llvm_library(LLVMMipsDesc
MipsAsmBackend.cpp
MipsELFObjectWriter.cpp
MipsELFStreamer.cpp
MipsMCAsmInfo.cpp
MipsMCCodeEmitter.cpp
MipsMCExpr.cpp

19
llvm/lib/Target/Mips/MCTargetDesc/MipsELFStreamer.cpp Normal file
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@ -0,0 +1,19 @@
//===-------- MipsELFStreamer.cpp - ELF Object Output ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "MipsELFStreamer.h"
namespace llvm {
MCELFStreamer *createMipsELFStreamer(MCContext &Context, MCAsmBackend &MAB,
raw_ostream &OS, MCCodeEmitter *Emitter,
const MCSubtargetInfo &STI, bool RelaxAll,
bool NoExecStack) {
return new MipsELFStreamer(Context, MAB, OS, Emitter, STI);
}
}

43
llvm/lib/Target/Mips/MCTargetDesc/MipsELFStreamer.h Normal file
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@ -0,0 +1,43 @@
//===-------- MipsELFStreamer.h - ELF Object Output -----------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This is a custom MCELFStreamer which allows us to insert some hooks before
// emitting data into an actual object file.
//
//===----------------------------------------------------------------------===//
#ifndef MIPSELFSTREAMER_H
#define MIPSELFSTREAMER_H
#include "llvm/MC/MCELFStreamer.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
class MCAsmBackend;
class MCCodeEmitter;
class MCContext;
class MCSubtargetInfo;
class MipsELFStreamer : public MCELFStreamer {
const MCSubtargetInfo &STI;
public:
MipsELFStreamer(MCContext &Context, MCAsmBackend &MAB, raw_ostream &OS,
MCCodeEmitter *Emitter, const MCSubtargetInfo &STI)
: MCELFStreamer(Context, MAB, OS, Emitter), STI(STI) {}
virtual ~MipsELFStreamer() {}
};
MCELFStreamer *createMipsELFStreamer(MCContext &Context, MCAsmBackend &MAB,
raw_ostream &OS, MCCodeEmitter *Emitter,
const MCSubtargetInfo &STI, bool RelaxAll,
bool NoExecStack);
} // namespace llvm.
#endif

4
llvm/lib/Target/Mips/MCTargetDesc/MipsMCTargetDesc.cpp
View File

@ -12,6 +12,7 @@
//===----------------------------------------------------------------------===//
#include "InstPrinter/MipsInstPrinter.h"
#include "MipsELFStreamer.h"
#include "MipsMCAsmInfo.h"
#include "MipsMCNaCl.h"
#include "MipsMCTargetDesc.h"
@ -112,7 +113,8 @@ static MCStreamer *createMCStreamer(const Target &T, StringRef TT,
bool RelaxAll, bool NoExecStack) {
MCStreamer *S;
if (!Triple(TT).isOSNaCl())
S = createELFStreamer(Context, MAB, OS, Emitter, RelaxAll, NoExecStack);
S = createMipsELFStreamer(Context, MAB, OS, Emitter, STI, RelaxAll,
NoExecStack);
else
S = createMipsNaClELFStreamer(Context, MAB, OS, Emitter, RelaxAll,
NoExecStack);