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//===-- ErlangGCPrinter.cpp - Erlang/OTP frametable emitter -----*- 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 compiler plugin that is used in order to emit
// garbage collection information in a convenient layout for parsing and
// loading in the Erlang/OTP runtime.
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/CodeGen/GCMetadataPrinter.h"
#include "llvm/CodeGen/GCs.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Metadata.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetSubtargetInfo.h"
using namespace llvm;
namespace {
class ErlangGCPrinter : public GCMetadataPrinter {
public:
void beginAssembly(AsmPrinter &AP) override;
void finishAssembly(AsmPrinter &AP) override;
};
}
static GCMetadataPrinterRegistry::Add<ErlangGCPrinter>
X("erlang", "erlang-compatible garbage collector");
void llvm::linkErlangGCPrinter() { }
void ErlangGCPrinter::beginAssembly(AsmPrinter &AP) { }
void ErlangGCPrinter::finishAssembly(AsmPrinter &AP) {
MCStreamer &OS = AP.OutStreamer;
unsigned IntPtrSize =
AP.TM.getSubtargetImpl()->getDataLayout()->getPointerSize();
// Put this in a custom .note section.
AP.OutStreamer.SwitchSection(AP.getObjFileLowering().getContext()
.getELFSection(".note.gc", ELF::SHT_PROGBITS, 0,
SectionKind::getDataRel()));
// For each function...
for (iterator FI = begin(), FE = end(); FI != FE; ++FI) {
GCFunctionInfo &MD = **FI;
/** A compact GC layout. Emit this data structure:
*
* struct {
* int16_t PointCount;
* void *SafePointAddress[PointCount];
* int16_t StackFrameSize; (in words)
* int16_t StackArity;
* int16_t LiveCount;
* int16_t LiveOffsets[LiveCount];
* } __gcmap_<FUNCTIONNAME>;
**/
// Align to address width.
AP.EmitAlignment(IntPtrSize == 4 ? 2 : 3);
// Emit PointCount.
OS.AddComment("safe point count");
AP.EmitInt16(MD.size());
// And each safe point...
for (GCFunctionInfo::iterator PI = MD.begin(), PE = MD.end(); PI != PE;
++PI) {
// Emit the address of the safe point.
OS.AddComment("safe point address");
MCSymbol *Label = PI->Label;
AP.EmitLabelPlusOffset(Label/*Hi*/, 0/*Offset*/, 4/*Size*/);
}
// Stack information never change in safe points! Only print info from the
// first call-site.
GCFunctionInfo::iterator PI = MD.begin();
// Emit the stack frame size.
OS.AddComment("stack frame size (in words)");
AP.EmitInt16(MD.getFrameSize() / IntPtrSize);
// Emit stack arity, i.e. the number of stacked arguments.
unsigned RegisteredArgs = IntPtrSize == 4 ? 5 : 6;
unsigned StackArity = MD.getFunction().arg_size() > RegisteredArgs ?
MD.getFunction().arg_size() - RegisteredArgs : 0;
OS.AddComment("stack arity");
AP.EmitInt16(StackArity);
// Emit the number of live roots in the function.
OS.AddComment("live root count");
AP.EmitInt16(MD.live_size(PI));
// And for each live root...
for (GCFunctionInfo::live_iterator LI = MD.live_begin(PI),
LE = MD.live_end(PI);
LI != LE; ++LI) {
// Emit live root's offset within the stack frame.
OS.AddComment("stack index (offset / wordsize)");
AP.EmitInt16(LI->StackOffset / IntPtrSize);
}
}
}
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