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[ARM] [MC] Refactor the constant pool classes

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ARMTargetStreamer implements ConstantPool and AssmeblerConstantPools
to keep track of assembler-generated constant pools that are used for
ldr-pseudo.

When implementing ldr-pseudo for AArch64, these two classes can be reused.
So this patch factors them out from ARM target to the general MC lib.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211198 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Weiming Zhao 2014-06-18 18:17:25 +00:00
parent 7ec69f6e10
commit de04c48578
4 changed files with 177 additions and 136 deletions
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80
include/llvm/MC/ConstantPools.h Normal file
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@ -0,0 +1,80 @@
//===- ConstantPool.h - Keep track of assembler-generated ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file declares the ConstantPool and AssemblerConstantPools classes.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_CONSTANTPOOL_H
#define LLVM_MC_CONSTANTPOOL_H
#include "llvm/ADT/SmallVector.h"
namespace llvm {
class MCContext;
class MCExpr;
class MCSection;
class MCStreamer;
class MCSymbol;
// A class to keep track of assembler-generated constant pools that are use to
// implement the ldr-pseudo.
class ConstantPool {
typedef SmallVector<std::pair<MCSymbol *, const MCExpr *>, 4> EntryVecTy;
EntryVecTy Entries;
public:
// Initialize a new empty constant pool
ConstantPool() {}
// Add a new entry to the constant pool in the next slot.
// \param Value is the new entry to put in the constant pool.
//
// \returns a MCExpr that references the newly inserted value
const MCExpr *addEntry(const MCExpr *Value, MCContext &Context);
// Emit the contents of the constant pool using the provided streamer.
void emitEntries(MCStreamer &Streamer);
// Return true if the constant pool is empty
bool empty();
};
class AssemblerConstantPools {
// Map type used to keep track of per-Section constant pools used by the
// ldr-pseudo opcode. The map associates a section to its constant pool. The
// constant pool is a vector of (label, value) pairs. When the ldr
// pseudo is parsed we insert a new (label, value) pair into the constant pool
// for the current section and add MCSymbolRefExpr to the new label as
// an opcode to the ldr. After we have parsed all the user input we
// output the (label, value) pairs in each constant pool at the end of the
// section.
//
// We use the MapVector for the map type to ensure stable iteration of
// the sections at the end of the parse. We need to iterate over the
// sections in a stable order to ensure that we have print the
// constant pools in a deterministic order when printing an assembly
// file.
typedef MapVector<const MCSection *, ConstantPool> ConstantPoolMapTy;
ConstantPoolMapTy ConstantPools;
public:
AssemblerConstantPools() {}
~AssemblerConstantPools() {}
void emitAll(MCStreamer &Streamer);
void emitForCurrentSection(MCStreamer &Streamer);
const MCExpr *addEntry(MCStreamer &Streamer, const MCExpr *Expr);
private:
ConstantPool *getConstantPool(const MCSection *Section);
ConstantPool &getOrCreateConstantPool(const MCSection *Section);
};
} // end namespace llvm
#endif

1
lib/MC/CMakeLists.txt
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@ -1,4 +1,5 @@
add_llvm_library(LLVMMC
ConstantPools.cpp
ELFObjectWriter.cpp
MCAsmBackend.cpp
MCAsmInfo.cpp

95
lib/MC/ConstantPools.cpp Normal file
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@ -0,0 +1,95 @@
//===- ConstantPools.cpp - ConstantPool class --*- C++ -*---------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the ConstantPool and AssemblerConstantPools classes.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/MapVector.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/ConstantPools.h"
using namespace llvm;
//
// ConstantPool implementation
//
// Emit the contents of the constant pool using the provided streamer.
void ConstantPool::emitEntries(MCStreamer &Streamer) {
if (Entries.empty())
return;
Streamer.EmitCodeAlignment(4); // align to 4-byte address
Streamer.EmitDataRegion(MCDR_DataRegion);
for (EntryVecTy::const_iterator I = Entries.begin(), E = Entries.end();
I != E; ++I) {
Streamer.EmitLabel(I->first);
Streamer.EmitValue(I->second, 4);
}
Streamer.EmitDataRegion(MCDR_DataRegionEnd);
Entries.clear();
}
const MCExpr *ConstantPool::addEntry(const MCExpr *Value, MCContext &Context) {
MCSymbol *CPEntryLabel = Context.CreateTempSymbol();
Entries.push_back(std::make_pair(CPEntryLabel, Value));
return MCSymbolRefExpr::Create(CPEntryLabel, Context);
}
bool ConstantPool::empty() { return Entries.empty(); }
//
// AssemblerConstantPools implementation
//
ConstantPool *
AssemblerConstantPools::getConstantPool(const MCSection *Section) {
ConstantPoolMapTy::iterator CP = ConstantPools.find(Section);
if (CP == ConstantPools.end())
return nullptr;
return &CP->second;
}
ConstantPool &
AssemblerConstantPools::getOrCreateConstantPool(const MCSection *Section) {
return ConstantPools[Section];
}
static void emitConstantPool(MCStreamer &Streamer, const MCSection *Section,
ConstantPool &CP) {
if (!CP.empty()) {
Streamer.SwitchSection(Section);
CP.emitEntries(Streamer);
}
}
void AssemblerConstantPools::emitAll(MCStreamer &Streamer) {
// Dump contents of assembler constant pools.
for (ConstantPoolMapTy::iterator CPI = ConstantPools.begin(),
CPE = ConstantPools.end();
CPI != CPE; ++CPI) {
const MCSection *Section = CPI->first;
ConstantPool &CP = CPI->second;
emitConstantPool(Streamer, Section, CP);
}
}
void AssemblerConstantPools::emitForCurrentSection(MCStreamer &Streamer) {
const MCSection *Section = Streamer.getCurrentSection().first;
if (ConstantPool *CP = getConstantPool(Section)) {
emitConstantPool(Streamer, Section, *CP);
}
}
const MCExpr *AssemblerConstantPools::addEntry(MCStreamer &Streamer,
const MCExpr *Expr) {
const MCSection *Section = Streamer.getCurrentSection().first;
return getOrCreateConstantPool(Section).addEntry(Expr, Streamer.getContext());
}

137
lib/Target/ARM/MCTargetDesc/ARMTargetStreamer.cpp
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@ -11,147 +11,12 @@
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/MapVector.h"
#include "llvm/MC/ConstantPools.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCStreamer.h"
using namespace llvm;
namespace {
// A class to keep track of assembler-generated constant pools that are use to
// implement the ldr-pseudo.
class ConstantPool {
typedef SmallVector<std::pair<MCSymbol *, const MCExpr *>, 4> EntryVecTy;
EntryVecTy Entries;
public:
// Initialize a new empty constant pool
ConstantPool() {}
// Add a new entry to the constant pool in the next slot.
// \param Value is the new entry to put in the constant pool.
//
// \returns a MCExpr that references the newly inserted value
const MCExpr *addEntry(const MCExpr *Value, MCContext &Context);
// Emit the contents of the constant pool using the provided streamer.
void emitEntries(MCStreamer &Streamer);
// Return true if the constant pool is empty
bool empty();
};
}
namespace llvm {
class AssemblerConstantPools {
// Map type used to keep track of per-Section constant pools used by the
// ldr-pseudo opcode. The map associates a section to its constant pool. The
// constant pool is a vector of (label, value) pairs. When the ldr
// pseudo is parsed we insert a new (label, value) pair into the constant pool
// for the current section and add MCSymbolRefExpr to the new label as
// an opcode to the ldr. After we have parsed all the user input we
// output the (label, value) pairs in each constant pool at the end of the
// section.
//
// We use the MapVector for the map type to ensure stable iteration of
// the sections at the end of the parse. We need to iterate over the
// sections in a stable order to ensure that we have print the
// constant pools in a deterministic order when printing an assembly
// file.
typedef MapVector<const MCSection *, ConstantPool> ConstantPoolMapTy;
ConstantPoolMapTy ConstantPools;
public:
AssemblerConstantPools() {}
~AssemblerConstantPools() {}
void emitAll(MCStreamer &Streamer);
void emitForCurrentSection(MCStreamer &Streamer);
const MCExpr *addEntry(MCStreamer &Streamer, const MCExpr *Expr);
private:
ConstantPool *getConstantPool(const MCSection *Section);
ConstantPool &getOrCreateConstantPool(const MCSection *Section);
};
}
//
// ConstantPool implementation
//
// Emit the contents of the constant pool using the provided streamer.
void ConstantPool::emitEntries(MCStreamer &Streamer) {
if (Entries.empty())
return;
Streamer.EmitCodeAlignment(4); // align to 4-byte address
Streamer.EmitDataRegion(MCDR_DataRegion);
for (EntryVecTy::const_iterator I = Entries.begin(), E = Entries.end();
I != E; ++I) {
Streamer.EmitLabel(I->first);
Streamer.EmitValue(I->second, 4);
}
Streamer.EmitDataRegion(MCDR_DataRegionEnd);
Entries.clear();
}
const MCExpr *ConstantPool::addEntry(const MCExpr *Value, MCContext &Context) {
MCSymbol *CPEntryLabel = Context.CreateTempSymbol();
Entries.push_back(std::make_pair(CPEntryLabel, Value));
return MCSymbolRefExpr::Create(CPEntryLabel, Context);
}
bool ConstantPool::empty() { return Entries.empty(); }
//
// AssemblerConstantPools implementation
//
ConstantPool *
AssemblerConstantPools::getConstantPool(const MCSection *Section) {
ConstantPoolMapTy::iterator CP = ConstantPools.find(Section);
if (CP == ConstantPools.end())
return nullptr;
return &CP->second;
}
ConstantPool &
AssemblerConstantPools::getOrCreateConstantPool(const MCSection *Section) {
return ConstantPools[Section];
}
static void emitConstantPool(MCStreamer &Streamer, const MCSection *Section,
ConstantPool &CP) {
if (!CP.empty()) {
Streamer.SwitchSection(Section);
CP.emitEntries(Streamer);
}
}
void AssemblerConstantPools::emitAll(MCStreamer &Streamer) {
// Dump contents of assembler constant pools.
for (ConstantPoolMapTy::iterator CPI = ConstantPools.begin(),
CPE = ConstantPools.end();
CPI != CPE; ++CPI) {
const MCSection *Section = CPI->first;
ConstantPool &CP = CPI->second;
emitConstantPool(Streamer, Section, CP);
}
}
void AssemblerConstantPools::emitForCurrentSection(MCStreamer &Streamer) {
const MCSection *Section = Streamer.getCurrentSection().first;
if (ConstantPool *CP = getConstantPool(Section)) {
emitConstantPool(Streamer, Section, *CP);
}
}
const MCExpr *AssemblerConstantPools::addEntry(MCStreamer &Streamer,
const MCExpr *Expr) {
const MCSection *Section = Streamer.getCurrentSection().first;
return getOrCreateConstantPool(Section).addEntry(Expr, Streamer.getContext());
}
//
// ARMTargetStreamer Implemenation
//