mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-14 11:32:34 +00:00
de04c48578
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
96 lines
3.0 KiB
C++
96 lines
3.0 KiB
C++
//===- 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());
|
|
}
|