MCLinkerOptimizationHint.h [plain text]
#ifndef LLVM_MC_MCLINKEROPTIMIZATIONHINT_H
#define LLVM_MC_MCLINKEROPTIMIZATIONHINT_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/MC/MCMachObjectWriter.h"
#include "llvm/Support/raw_ostream.h"
namespace llvm {
class MCAsmLayout;
class MCSymbol;
enum MCLOHType {
MCLOH_AdrpAdrp = 0x1u, MCLOH_AdrpLdr = 0x2u, MCLOH_AdrpAddLdr = 0x3u, MCLOH_AdrpLdrGotLdr = 0x4u, MCLOH_AdrpAddStr = 0x5u, MCLOH_AdrpLdrGotStr = 0x6u, MCLOH_AdrpAdd = 0x7u, MCLOH_AdrpLdrGot = 0x8u };
static inline StringRef MCLOHDirectiveName() {
return StringRef(".loh");
}
static inline bool isValidMCLOHType(unsigned Kind) {
return Kind >= MCLOH_AdrpAdrp && Kind <= MCLOH_AdrpLdrGot;
}
static inline int MCLOHNameToId(StringRef Name) {
#define MCLOHCaseNameToId(Name) .Case(#Name, MCLOH_ ## Name)
return StringSwitch<int>(Name)
MCLOHCaseNameToId(AdrpAdrp)
MCLOHCaseNameToId(AdrpLdr)
MCLOHCaseNameToId(AdrpAddLdr)
MCLOHCaseNameToId(AdrpLdrGotLdr)
MCLOHCaseNameToId(AdrpAddStr)
MCLOHCaseNameToId(AdrpLdrGotStr)
MCLOHCaseNameToId(AdrpAdd)
MCLOHCaseNameToId(AdrpLdrGot)
.Default(-1);
}
static inline StringRef MCLOHIdToName(MCLOHType Kind) {
#define MCLOHCaseIdToName(Name) case MCLOH_ ## Name: return StringRef(#Name);
switch (Kind) {
MCLOHCaseIdToName(AdrpAdrp);
MCLOHCaseIdToName(AdrpLdr);
MCLOHCaseIdToName(AdrpAddLdr);
MCLOHCaseIdToName(AdrpLdrGotLdr);
MCLOHCaseIdToName(AdrpAddStr);
MCLOHCaseIdToName(AdrpLdrGotStr);
MCLOHCaseIdToName(AdrpAdd);
MCLOHCaseIdToName(AdrpLdrGot);
}
return StringRef();
}
static inline int MCLOHIdToNbArgs(MCLOHType Kind) {
switch (Kind) {
case MCLOH_AdrpAdrp:
case MCLOH_AdrpLdr:
case MCLOH_AdrpAdd:
case MCLOH_AdrpLdrGot:
return 2;
case MCLOH_AdrpAddLdr:
case MCLOH_AdrpLdrGotLdr:
case MCLOH_AdrpAddStr:
case MCLOH_AdrpLdrGotStr:
return 3;
}
return -1;
}
class MCLOHDirective {
MCLOHType Kind;
SmallVector<MCSymbol *, 3> Args;
void Emit_impl(raw_ostream &OutStream, const MachObjectWriter &ObjWriter,
const MCAsmLayout &Layout) const;
public:
typedef SmallVectorImpl<MCSymbol *> LOHArgs;
MCLOHDirective(MCLOHType Kind, const LOHArgs &Args)
: Kind(Kind), Args(Args.begin(), Args.end()) {
assert(isValidMCLOHType(Kind) && "Invalid LOH directive type!");
}
MCLOHType getKind() const { return Kind; }
const LOHArgs &getArgs() const { return Args; }
void Emit(MachObjectWriter &ObjWriter, const MCAsmLayout &Layout) const {
raw_ostream &OutStream = ObjWriter.getStream();
Emit_impl(OutStream, ObjWriter, Layout);
}
uint64_t getEmitSize(const MachObjectWriter &ObjWriter,
const MCAsmLayout &Layout) const {
class raw_counting_ostream : public raw_ostream {
uint64_t Count;
void write_impl(const char *, size_t size) override { Count += size; }
uint64_t current_pos() const override { return Count; }
public:
raw_counting_ostream() : Count(0) {}
~raw_counting_ostream() { flush(); }
};
raw_counting_ostream OutStream;
Emit_impl(OutStream, ObjWriter, Layout);
return OutStream.tell();
}
};
class MCLOHContainer {
mutable uint64_t EmitSize;
SmallVector<MCLOHDirective, 32> Directives;
public:
typedef SmallVectorImpl<MCLOHDirective> LOHDirectives;
MCLOHContainer() : EmitSize(0) {};
const LOHDirectives &getDirectives() const {
return Directives;
}
void addDirective(MCLOHType Kind, const MCLOHDirective::LOHArgs &Args) {
Directives.push_back(MCLOHDirective(Kind, Args));
}
uint64_t getEmitSize(const MachObjectWriter &ObjWriter,
const MCAsmLayout &Layout) const {
if (!EmitSize) {
for (const MCLOHDirective &D : Directives)
EmitSize += D.getEmitSize(ObjWriter, Layout);
}
return EmitSize;
}
void Emit(MachObjectWriter &ObjWriter, const MCAsmLayout &Layout) const {
for (const MCLOHDirective &D : Directives)
D.Emit(ObjWriter, Layout);
}
void reset() {
Directives.clear();
EmitSize = 0;
}
};
typedef MCLOHDirective::LOHArgs MCLOHArgs;
typedef MCLOHContainer::LOHDirectives MCLOHDirectives;
}
#endif