//
//===----------------------------------------------------------------------===//
-#define DEBUG_TYPE "stackmaps"
-
#include "llvm/CodeGen/StackMaps.h"
#include "llvm/CodeGen/AsmPrinter.h"
-#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCObjectFileInfo.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOpcodes.h"
#include "llvm/Target/TargetRegisterInfo.h"
+#include "llvm/Target/TargetSubtargetInfo.h"
#include <iterator>
using namespace llvm;
+#define DEBUG_TYPE "stackmaps"
+
+static cl::opt<int> StackMapVersion("stackmap-version", cl::init(1),
+ cl::desc("Specify the stackmap encoding version (default = 1)"));
+
+const char *StackMaps::WSMP = "Stack Maps: ";
+
PatchPointOpers::PatchPointOpers(const MachineInstr *MI)
: MI(MI),
HasDef(MI->getOperand(0).isReg() && MI->getOperand(0).isDef() &&
return ScratchIdx;
}
+StackMaps::StackMaps(AsmPrinter &AP) : AP(AP) {
+ if (StackMapVersion != 1)
+ llvm_unreachable("Unsupported stackmap version!");
+}
+
MachineInstr::const_mop_iterator
StackMaps::parseOperand(MachineInstr::const_mop_iterator MOI,
MachineInstr::const_mop_iterator MOE,
switch (MOI->getImm()) {
default: llvm_unreachable("Unrecognized operand type.");
case StackMaps::DirectMemRefOp: {
- unsigned Size = AP.TM.getDataLayout()->getPointerSizeInBits();
+ unsigned Size =
+ AP.TM.getSubtargetImpl()->getDataLayout()->getPointerSizeInBits();
assert((Size % 8) == 0 && "Need pointer size in bytes.");
Size /= 8;
unsigned Reg = (++MOI)->getReg();
assert(TargetRegisterInfo::isPhysicalRegister(MOI->getReg()) &&
"Virtreg operands should have been rewritten before now.");
const TargetRegisterClass *RC =
- AP.TM.getRegisterInfo()->getMinimalPhysRegClass(MOI->getReg());
+ AP.TM.getSubtargetImpl()->getRegisterInfo()->getMinimalPhysRegClass(
+ MOI->getReg());
assert(!MOI->getSubReg() && "Physical subreg still around.");
Locs.push_back(
Location(Location::Register, RC->getSize(), MOI->getReg(), 0));
StackMaps::LiveOutVec
StackMaps::parseRegisterLiveOutMask(const uint32_t *Mask) const {
assert(Mask && "No register mask specified");
- const TargetRegisterInfo *TRI = AP.TM.getRegisterInfo();
+ const TargetRegisterInfo *TRI = AP.TM.getSubtargetImpl()->getRegisterInfo();
LiveOutVec LiveOuts;
// Create a LiveOutReg for each bit that is set in the register mask.
std::sort(LiveOuts.begin(), LiveOuts.end());
for (LiveOutVec::iterator I = LiveOuts.begin(), E = LiveOuts.end();
I != E; ++I) {
- for (LiveOutVec::iterator II = next(I); II != E; ++II) {
+ for (LiveOutVec::iterator II = std::next(I); II != E; ++II) {
if (I->RegNo != II->RegNo) {
// Skip all the now invalid entries.
I = --II;
if (recordResult) {
assert(PatchPointOpers(&MI).hasDef() && "Stackmap has no return value.");
- parseOperand(MI.operands_begin(), llvm::next(MI.operands_begin()),
+ parseOperand(MI.operands_begin(), std::next(MI.operands_begin()),
Locations, LiveOuts);
}
if (I->LocType == Location::Constant &&
((I->Offset + (int64_t(1)<<31)) >> 32) != 0) {
I->LocType = Location::ConstantIndex;
- I->Offset = ConstPool.getConstantIndex(I->Offset);
+ auto Result = ConstPool.insert(std::make_pair(I->Offset, I->Offset));
+ I->Offset = Result.first - ConstPool.begin();
}
}
MCSymbolRefExpr::Create(AP.CurrentFnSym, OutContext),
OutContext);
- CSInfos.push_back(CallsiteInfo(CSOffsetExpr, ID, Locations, LiveOuts));
+ CSInfos.emplace_back(CSOffsetExpr, ID, std::move(Locations),
+ std::move(LiveOuts));
// Record the stack size of the current function.
const MachineFrameInfo *MFI = AP.MF->getFrameInfo();
+ const TargetRegisterInfo *RegInfo = AP.MF->getSubtarget().getRegisterInfo();
+ const bool DynamicFrameSize = MFI->hasVarSizedObjects() ||
+ RegInfo->needsStackRealignment(*(AP.MF));
FnStackSize[AP.CurrentFnSym] =
- MFI->hasVarSizedObjects() ? ~0U : MFI->getStackSize();
+ DynamicFrameSize ? UINT64_MAX : MFI->getStackSize();
}
void StackMaps::recordStackMap(const MachineInstr &MI) {
assert(MI.getOpcode() == TargetOpcode::STACKMAP && "expected stackmap");
int64_t ID = MI.getOperand(0).getImm();
- recordStackMapOpers(MI, ID, llvm::next(MI.operands_begin(), 2),
+ recordStackMapOpers(MI, ID, std::next(MI.operands_begin(), 2),
MI.operands_end());
}
int64_t ID = opers.getMetaOper(PatchPointOpers::IDPos).getImm();
MachineInstr::const_mop_iterator MOI =
- llvm::next(MI.operands_begin(), opers.getStackMapStartIdx());
+ std::next(MI.operands_begin(), opers.getStackMapStartIdx());
recordStackMapOpers(MI, ID, MOI, MI.operands_end(),
opers.isAnyReg() && opers.hasDef());
#endif
}
-/// serializeToStackMapSection conceptually populates the following fields:
+/// Emit the stackmap header.
///
-/// uint32 : Reserved (header)
+/// Header {
+/// uint8 : Stack Map Version (currently 1)
+/// uint8 : Reserved (expected to be 0)
+/// uint16 : Reserved (expected to be 0)
+/// }
/// uint32 : NumFunctions
+/// uint32 : NumConstants
+/// uint32 : NumRecords
+void StackMaps::emitStackmapHeader(MCStreamer &OS) {
+ // Header.
+ OS.EmitIntValue(StackMapVersion, 1); // Version.
+ OS.EmitIntValue(0, 1); // Reserved.
+ OS.EmitIntValue(0, 2); // Reserved.
+
+ // Num functions.
+ DEBUG(dbgs() << WSMP << "#functions = " << FnStackSize.size() << '\n');
+ OS.EmitIntValue(FnStackSize.size(), 4);
+ // Num constants.
+ DEBUG(dbgs() << WSMP << "#constants = " << ConstPool.size() << '\n');
+ OS.EmitIntValue(ConstPool.size(), 4);
+ // Num callsites.
+ DEBUG(dbgs() << WSMP << "#callsites = " << CSInfos.size() << '\n');
+ OS.EmitIntValue(CSInfos.size(), 4);
+}
+
+/// Emit the function frame record for each function.
+///
/// StkSizeRecord[NumFunctions] {
-/// uint32 : Function Offset
-/// uint32 : Stack Size
+/// uint64 : Function Address
+/// uint64 : Stack Size
/// }
-/// uint32 : NumConstants
+void StackMaps::emitFunctionFrameRecords(MCStreamer &OS) {
+ // Function Frame records.
+ DEBUG(dbgs() << WSMP << "functions:\n");
+ for (auto const &FR : FnStackSize) {
+ DEBUG(dbgs() << WSMP << "function addr: " << FR.first
+ << " frame size: " << FR.second);
+ OS.EmitSymbolValue(FR.first, 8);
+ OS.EmitIntValue(FR.second, 8);
+ }
+}
+
+/// Emit the constant pool.
+///
/// int64 : Constants[NumConstants]
-/// uint32 : NumRecords
+void StackMaps::emitConstantPoolEntries(MCStreamer &OS) {
+ // Constant pool entries.
+ DEBUG(dbgs() << WSMP << "constants:\n");
+ for (auto ConstEntry : ConstPool) {
+ DEBUG(dbgs() << WSMP << ConstEntry.second << '\n');
+ OS.EmitIntValue(ConstEntry.second, 8);
+ }
+}
+
+/// Emit the callsite info for each callsite.
+///
/// StkMapRecord[NumRecords] {
/// uint64 : PatchPoint ID
/// uint32 : Instruction Offset
/// uint16 : Dwarf RegNum
/// int32 : Offset
/// }
+/// uint16 : Padding
/// uint16 : NumLiveOuts
-/// LiveOuts[NumLiveOuts]
+/// LiveOuts[NumLiveOuts] {
/// uint16 : Dwarf RegNum
/// uint8 : Reserved
/// uint8 : Size in Bytes
+/// }
+/// uint32 : Padding (only if required to align to 8 byte)
/// }
///
/// Location Encoding, Type, Value:
/// 0x3, Indirect, [Reg + Offset] (spilled value)
/// 0x4, Constant, Offset (small constant)
/// 0x5, ConstIndex, Constants[Offset] (large constant)
-///
-void StackMaps::serializeToStackMapSection() {
- // Bail out if there's no stack map data.
- if (CSInfos.empty())
- return;
+void StackMaps::emitCallsiteEntries(MCStreamer &OS,
+ const TargetRegisterInfo *TRI) {
+ // Callsite entries.
+ DEBUG(dbgs() << WSMP << "callsites:\n");
+ for (const auto &CSI : CSInfos) {
+ const LocationVec &CSLocs = CSI.Locations;
+ const LiveOutVec &LiveOuts = CSI.LiveOuts;
- MCContext &OutContext = AP.OutStreamer.getContext();
- const TargetRegisterInfo *TRI = AP.TM.getRegisterInfo();
-
- // Create the section.
- const MCSection *StackMapSection =
- OutContext.getObjectFileInfo()->getStackMapSection();
- AP.OutStreamer.SwitchSection(StackMapSection);
-
- // Emit a dummy symbol to force section inclusion.
- AP.OutStreamer.EmitLabel(
- OutContext.GetOrCreateSymbol(Twine("__LLVM_StackMaps")));
-
- // Serialize data.
- const char *WSMP = "Stack Maps: ";
- (void)WSMP;
-
- DEBUG(dbgs() << "********** Stack Map Output **********\n");
-
- // Header.
- AP.OutStreamer.EmitIntValue(0, 4);
-
- // Num functions.
- AP.OutStreamer.EmitIntValue(FnStackSize.size(), 4);
-
- // Stack size entries.
- for (FnStackSizeMap::iterator I = FnStackSize.begin(), E = FnStackSize.end();
- I != E; ++I) {
- AP.OutStreamer.EmitSymbolValue(I->first, 4);
- AP.OutStreamer.EmitIntValue(I->second, 4);
- }
-
- // Num constants.
- AP.OutStreamer.EmitIntValue(ConstPool.getNumConstants(), 4);
-
- // Constant pool entries.
- for (unsigned i = 0; i < ConstPool.getNumConstants(); ++i)
- AP.OutStreamer.EmitIntValue(ConstPool.getConstant(i), 8);
-
- DEBUG(dbgs() << WSMP << "#callsites = " << CSInfos.size() << "\n");
- AP.OutStreamer.EmitIntValue(CSInfos.size(), 4);
-
- for (CallsiteInfoList::const_iterator CSII = CSInfos.begin(),
- CSIE = CSInfos.end();
- CSII != CSIE; ++CSII) {
-
- uint64_t CallsiteID = CSII->ID;
- const LocationVec &CSLocs = CSII->Locations;
- const LiveOutVec &LiveOuts = CSII->LiveOuts;
-
- DEBUG(dbgs() << WSMP << "callsite " << CallsiteID << "\n");
+ DEBUG(dbgs() << WSMP << "callsite " << CSI.ID << "\n");
// Verify stack map entry. It's better to communicate a problem to the
// runtime than crash in case of in-process compilation. Currently, we do
// simple overflow checks, but we may eventually communicate other
// compilation errors this way.
if (CSLocs.size() > UINT16_MAX || LiveOuts.size() > UINT16_MAX) {
- AP.OutStreamer.EmitIntValue(UINT64_MAX, 8); // Invalid ID.
- AP.OutStreamer.EmitValue(CSII->CSOffsetExpr, 4);
- AP.OutStreamer.EmitIntValue(0, 2); // Reserved.
- AP.OutStreamer.EmitIntValue(0, 2); // 0 locations.
- AP.OutStreamer.EmitIntValue(0, 2); // 0 live-out registers.
+ OS.EmitIntValue(UINT64_MAX, 8); // Invalid ID.
+ OS.EmitValue(CSI.CSOffsetExpr, 4);
+ OS.EmitIntValue(0, 2); // Reserved.
+ OS.EmitIntValue(0, 2); // 0 locations.
+ OS.EmitIntValue(0, 2); // padding.
+ OS.EmitIntValue(0, 2); // 0 live-out registers.
+ OS.EmitIntValue(0, 4); // padding.
continue;
}
- AP.OutStreamer.EmitIntValue(CallsiteID, 8);
- AP.OutStreamer.EmitValue(CSII->CSOffsetExpr, 4);
+ OS.EmitIntValue(CSI.ID, 8);
+ OS.EmitValue(CSI.CSOffsetExpr, 4);
// Reserved for flags.
- AP.OutStreamer.EmitIntValue(0, 2);
+ OS.EmitIntValue(0, 2);
DEBUG(dbgs() << WSMP << " has " << CSLocs.size() << " locations\n");
- AP.OutStreamer.EmitIntValue(CSLocs.size(), 2);
+ OS.EmitIntValue(CSLocs.size(), 2);
- unsigned operIdx = 0;
- for (LocationVec::const_iterator LocI = CSLocs.begin(), LocE = CSLocs.end();
- LocI != LocE; ++LocI, ++operIdx) {
- const Location &Loc = *LocI;
+ unsigned OperIdx = 0;
+ for (const auto &Loc : CSLocs) {
unsigned RegNo = 0;
int Offset = Loc.Offset;
if(Loc.Reg) {
"Missing location register");
}
- DEBUG(
- dbgs() << WSMP << " Loc " << operIdx << ": ";
- switch (Loc.LocType) {
- case Location::Unprocessed:
- dbgs() << "<Unprocessed operand>";
- break;
- case Location::Register:
- dbgs() << "Register " << TRI->getName(Loc.Reg);
- break;
- case Location::Direct:
- dbgs() << "Direct " << TRI->getName(Loc.Reg);
- if (Loc.Offset)
- dbgs() << " + " << Loc.Offset;
- break;
- case Location::Indirect:
- dbgs() << "Indirect " << TRI->getName(Loc.Reg)
- << " + " << Loc.Offset;
- break;
- case Location::Constant:
- dbgs() << "Constant " << Loc.Offset;
- break;
- case Location::ConstantIndex:
- dbgs() << "Constant Index " << Loc.Offset;
- break;
- }
- dbgs() << " [encoding: .byte " << Loc.LocType
- << ", .byte " << Loc.Size
- << ", .short " << RegNo
- << ", .int " << Offset << "]\n";
- );
-
- AP.OutStreamer.EmitIntValue(Loc.LocType, 1);
- AP.OutStreamer.EmitIntValue(Loc.Size, 1);
- AP.OutStreamer.EmitIntValue(RegNo, 2);
- AP.OutStreamer.EmitIntValue(Offset, 4);
+ DEBUG(dbgs() << WSMP << " Loc " << OperIdx << ": ";
+ switch (Loc.LocType) {
+ case Location::Unprocessed:
+ dbgs() << "<Unprocessed operand>";
+ break;
+ case Location::Register:
+ dbgs() << "Register " << TRI->getName(Loc.Reg);
+ break;
+ case Location::Direct:
+ dbgs() << "Direct " << TRI->getName(Loc.Reg);
+ if (Loc.Offset)
+ dbgs() << " + " << Loc.Offset;
+ break;
+ case Location::Indirect:
+ dbgs() << "Indirect " << TRI->getName(Loc.Reg)
+ << " + " << Loc.Offset;
+ break;
+ case Location::Constant:
+ dbgs() << "Constant " << Loc.Offset;
+ break;
+ case Location::ConstantIndex:
+ dbgs() << "Constant Index " << Loc.Offset;
+ break;
+ }
+ dbgs() << " [encoding: .byte " << Loc.LocType
+ << ", .byte " << Loc.Size
+ << ", .short " << RegNo
+ << ", .int " << Offset << "]\n";
+ );
+
+ OS.EmitIntValue(Loc.LocType, 1);
+ OS.EmitIntValue(Loc.Size, 1);
+ OS.EmitIntValue(RegNo, 2);
+ OS.EmitIntValue(Offset, 4);
+ OperIdx++;
}
DEBUG(dbgs() << WSMP << " has " << LiveOuts.size()
- << " live-out registers\n");
+ << " live-out registers\n");
+
+ // Num live-out registers and padding to align to 4 byte.
+ OS.EmitIntValue(0, 2);
+ OS.EmitIntValue(LiveOuts.size(), 2);
+
+ OperIdx = 0;
+ for (const auto &LO : LiveOuts) {
+ DEBUG(dbgs() << WSMP << " LO " << OperIdx << ": "
+ << TRI->getName(LO.Reg)
+ << " [encoding: .short " << LO.RegNo
+ << ", .byte 0, .byte " << LO.Size << "]\n");
+ OS.EmitIntValue(LO.RegNo, 2);
+ OS.EmitIntValue(0, 1);
+ OS.EmitIntValue(LO.Size, 1);
+ }
+ // Emit alignment to 8 byte.
+ OS.EmitValueToAlignment(8);
+ }
+}
+
+/// Serialize the stackmap data.
+void StackMaps::serializeToStackMapSection() {
+ (void) WSMP;
+ // Bail out if there's no stack map data.
+ assert((!CSInfos.empty() || (CSInfos.empty() && ConstPool.empty())) &&
+ "Expected empty constant pool too!");
+ assert((!CSInfos.empty() || (CSInfos.empty() && FnStackSize.empty())) &&
+ "Expected empty function record too!");
+ if (CSInfos.empty())
+ return;
- AP.OutStreamer.EmitIntValue(LiveOuts.size(), 2);
+ MCContext &OutContext = AP.OutStreamer.getContext();
+ MCStreamer &OS = AP.OutStreamer;
+ const TargetRegisterInfo *TRI = AP.TM.getSubtargetImpl()->getRegisterInfo();
- operIdx = 0;
- for (LiveOutVec::const_iterator LI = LiveOuts.begin(), LE = LiveOuts.end();
- LI != LE; ++LI, ++operIdx) {
- DEBUG(dbgs() << WSMP << " LO " << operIdx << ": "
- << TRI->getName(LI->Reg)
- << " [encoding: .short " << LI->RegNo
- << ", .byte 0, .byte " << LI->Size << "]\n");
+ // Create the section.
+ const MCSection *StackMapSection =
+ OutContext.getObjectFileInfo()->getStackMapSection();
+ OS.SwitchSection(StackMapSection);
- AP.OutStreamer.EmitIntValue(LI->RegNo, 2);
- AP.OutStreamer.EmitIntValue(0, 1);
- AP.OutStreamer.EmitIntValue(LI->Size, 1);
- }
- }
+ // Emit a dummy symbol to force section inclusion.
+ OS.EmitLabel(OutContext.GetOrCreateSymbol(Twine("__LLVM_StackMaps")));
- AP.OutStreamer.AddBlankLine();
+ // Serialize data.
+ DEBUG(dbgs() << "********** Stack Map Output **********\n");
+ emitStackmapHeader(OS);
+ emitFunctionFrameRecords(OS);
+ emitConstantPoolEntries(OS);
+ emitCallsiteEntries(OS, TRI);
+ OS.AddBlankLine();
+ // Clean up.
CSInfos.clear();
+ ConstPool.clear();
}
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