mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 04:02:41 +01:00
102 lines
3.3 KiB
C++
102 lines
3.3 KiB
C++
//===- ConstantPools.h - Keep track of assembler-generated ------*- C++ -*-===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file declares the ConstantPool and AssemblerConstantPools classes.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_MC_CONSTANTPOOLS_H
|
|
#define LLVM_MC_CONSTANTPOOLS_H
|
|
|
|
#include "llvm/ADT/MapVector.h"
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/Support/SMLoc.h"
|
|
#include <cstdint>
|
|
#include <map>
|
|
|
|
namespace llvm {
|
|
|
|
class MCContext;
|
|
class MCExpr;
|
|
class MCSection;
|
|
class MCStreamer;
|
|
class MCSymbol;
|
|
class MCSymbolRefExpr;
|
|
|
|
struct ConstantPoolEntry {
|
|
ConstantPoolEntry(MCSymbol *L, const MCExpr *Val, unsigned Sz, SMLoc Loc_)
|
|
: Label(L), Value(Val), Size(Sz), Loc(Loc_) {}
|
|
|
|
MCSymbol *Label;
|
|
const MCExpr *Value;
|
|
unsigned Size;
|
|
SMLoc Loc;
|
|
};
|
|
|
|
// A class to keep track of assembler-generated constant pools that are use to
|
|
// implement the ldr-pseudo.
|
|
class ConstantPool {
|
|
using EntryVecTy = SmallVector<ConstantPoolEntry, 4>;
|
|
EntryVecTy Entries;
|
|
std::map<int64_t, const MCSymbolRefExpr *> CachedEntries;
|
|
|
|
public:
|
|
// Initialize a new empty constant pool
|
|
ConstantPool() = default;
|
|
|
|
// Add a new entry to the constant pool in the next slot.
|
|
// \param Value is the new entry to put in the constant pool.
|
|
// \param Size is the size in bytes of the entry
|
|
//
|
|
// \returns a MCExpr that references the newly inserted value
|
|
const MCExpr *addEntry(const MCExpr *Value, MCContext &Context,
|
|
unsigned Size, SMLoc Loc);
|
|
|
|
// 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();
|
|
|
|
void clearCache();
|
|
};
|
|
|
|
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.
|
|
using ConstantPoolMapTy = MapVector<MCSection *, ConstantPool>;
|
|
ConstantPoolMapTy ConstantPools;
|
|
|
|
public:
|
|
void emitAll(MCStreamer &Streamer);
|
|
void emitForCurrentSection(MCStreamer &Streamer);
|
|
void clearCacheForCurrentSection(MCStreamer &Streamer);
|
|
const MCExpr *addEntry(MCStreamer &Streamer, const MCExpr *Expr,
|
|
unsigned Size, SMLoc Loc);
|
|
|
|
private:
|
|
ConstantPool *getConstantPool(MCSection *Section);
|
|
ConstantPool &getOrCreateConstantPool(MCSection *Section);
|
|
};
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif // LLVM_MC_CONSTANTPOOLS_H
|