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llvm-mirror/lib/CodeGen/StackColoring.cpp
Matthias Braun 566827a026 Move VariableDbgInfo from MachineModuleInfo to MachineFunction 
VariableDbgInfo is per function data, so it makes sense to have it with
the function instead of the module.

This is a necessary step to have machine module passes work properly.

Differential Revision: https://reviews.llvm.org/D27186

llvm-svn: 288292
2016-11-30 23:48:50 +00:00

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//===-- StackColoring.cpp -------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This pass implements the stack-coloring optimization that looks for
// lifetime markers machine instructions (LIFESTART_BEGIN and LIFESTART_END),
// which represent the possible lifetime of stack slots. It attempts to
// merge disjoint stack slots and reduce the used stack space.
// NOTE: This pass is not StackSlotColoring, which optimizes spill slots.
//
// TODO: In the future we plan to improve stack coloring in the following ways:
// 1. Allow merging multiple small slots into a single larger slot at different
// offsets.
// 2. Merge this pass with StackSlotColoring and allow merging of allocas with
// spill slots.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/PostOrderIterator.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/CodeGen/LiveInterval.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineLoopInfo.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/CodeGen/PseudoSourceValue.h"
#include "llvm/CodeGen/SlotIndexes.h"
#include "llvm/CodeGen/StackProtector.h"
#include "llvm/CodeGen/WinEHFuncInfo.h"
#include "llvm/IR/DebugInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetRegisterInfo.h"
using namespace llvm;
#define DEBUG_TYPE "stackcoloring"
static cl::opt<bool>
DisableColoring("no-stack-coloring",
cl::init(false), cl::Hidden,
cl::desc("Disable stack coloring"));
/// The user may write code that uses allocas outside of the declared lifetime
/// zone. This can happen when the user returns a reference to a local
/// data-structure. We can detect these cases and decide not to optimize the
/// code. If this flag is enabled, we try to save the user. This option
/// is treated as overriding LifetimeStartOnFirstUse below.
static cl::opt<bool>
ProtectFromEscapedAllocas("protect-from-escaped-allocas",
cl::init(false), cl::Hidden,
cl::desc("Do not optimize lifetime zones that "
"are broken"));
/// Enable enhanced dataflow scheme for lifetime analysis (treat first
/// use of stack slot as start of slot lifetime, as opposed to looking
/// for LIFETIME_START marker). See "Implementation notes" below for
/// more info.
static cl::opt<bool>
LifetimeStartOnFirstUse("stackcoloring-lifetime-start-on-first-use",
cl::init(true), cl::Hidden,
cl::desc("Treat stack lifetimes as starting on first use, not on START marker."));
STATISTIC(NumMarkerSeen, "Number of lifetime markers found.");
STATISTIC(StackSpaceSaved, "Number of bytes saved due to merging slots.");
STATISTIC(StackSlotMerged, "Number of stack slot merged.");
STATISTIC(EscapedAllocas, "Number of allocas that escaped the lifetime region");
//
// Implementation Notes:
// ---------------------
//
// Consider the following motivating example:
//
// int foo() {
// char b1[1024], b2[1024];
// if (...) {
// char b3[1024];
// <uses of b1, b3>;
// return x;
// } else {
// char b4[1024], b5[1024];
// <uses of b2, b4, b5>;
// return y;
// }
// }
//
// In the code above, "b3" and "b4" are declared in distinct lexical
// scopes, meaning that it is easy to prove that they can share the
// same stack slot. Variables "b1" and "b2" are declared in the same
// scope, meaning that from a lexical point of view, their lifetimes
// overlap. From a control flow pointer of view, however, the two
// variables are accessed in disjoint regions of the CFG, thus it
// should be possible for them to share the same stack slot. An ideal
// stack allocation for the function above would look like:
//
// slot 0: b1, b2
// slot 1: b3, b4
// slot 2: b5
//
// Achieving this allocation is tricky, however, due to the way
// lifetime markers are inserted. Here is a simplified view of the
// control flow graph for the code above:
//
// +------ block 0 -------+
// 0| LIFETIME_START b1, b2 |
// 1| <test 'if' condition> |
// +-----------------------+
// ./ \.
// +------ block 1 -------+ +------ block 2 -------+
// 2| LIFETIME_START b3 | 5| LIFETIME_START b4, b5 |
// 3| <uses of b1, b3> | 6| <uses of b2, b4, b5> |
// 4| LIFETIME_END b3 | 7| LIFETIME_END b4, b5 |
// +-----------------------+ +-----------------------+
// \. /.
// +------ block 3 -------+
// 8| <cleanupcode> |
// 9| LIFETIME_END b1, b2 |
// 10| return |
// +-----------------------+
//
// If we create live intervals for the variables above strictly based
// on the lifetime markers, we'll get the set of intervals on the
// left. If we ignore the lifetime start markers and instead treat a
// variable's lifetime as beginning with the first reference to the
// var, then we get the intervals on the right.
//
// LIFETIME_START First Use
// b1: [0,9] [3,4] [8,9]
// b2: [0,9] [6,9]
// b3: [2,4] [3,4]
// b4: [5,7] [6,7]
// b5: [5,7] [6,7]
//
// For the intervals on the left, the best we can do is overlap two
// variables (b3 and b4, for example); this gives us a stack size of
// 4*1024 bytes, not ideal. When treating first-use as the start of a
// lifetime, we can additionally overlap b1 and b5, giving us a 3*1024
// byte stack (better).
//
// Relying entirely on first-use of stack slots is problematic,
// however, due to the fact that optimizations can sometimes migrate
// uses of a variable outside of its lifetime start/end region. Here
// is an example:
//
// int bar() {
// char b1[1024], b2[1024];
// if (...) {
// <uses of b2>
// return y;
// } else {
// <uses of b1>
// while (...) {
// char b3[1024];
// <uses of b3>
// }
// }
// }
//
// Before optimization, the control flow graph for the code above
// might look like the following:
//
// +------ block 0 -------+
// 0| LIFETIME_START b1, b2 |
// 1| <test 'if' condition> |
// +-----------------------+
// ./ \.
// +------ block 1 -------+ +------- block 2 -------+
// 2| <uses of b2> | 3| <uses of b1> |
// +-----------------------+ +-----------------------+
// | |
// | +------- block 3 -------+ <-\.
// | 4| <while condition> | |
// | +-----------------------+ |
// | / | |
// | / +------- block 4 -------+
// \ / 5| LIFETIME_START b3 | |
// \ / 6| <uses of b3> | |
// \ / 7| LIFETIME_END b3 | |
// \ | +------------------------+ |
// \ | \ /
// +------ block 5 -----+ \---------------
// 8| <cleanupcode> |
// 9| LIFETIME_END b1, b2 |
// 10| return |
// +---------------------+
//
// During optimization, however, it can happen that an instruction
// computing an address in "b3" (for example, a loop-invariant GEP) is
// hoisted up out of the loop from block 4 to block 2. [Note that
// this is not an actual load from the stack, only an instruction that
// computes the address to be loaded]. If this happens, there is now a
// path leading from the first use of b3 to the return instruction
// that does not encounter the b3 LIFETIME_END, hence b3's lifetime is
// now larger than if we were computing live intervals strictly based
// on lifetime markers. In the example above, this lengthened lifetime
// would mean that it would appear illegal to overlap b3 with b2.
//
// To deal with this such cases, the code in ::collectMarkers() below
// tries to identify "degenerate" slots -- those slots where on a single
// forward pass through the CFG we encounter a first reference to slot
// K before we hit the slot K lifetime start marker. For such slots,
// we fall back on using the lifetime start marker as the beginning of
// the variable's lifetime. NB: with this implementation, slots can
// appear degenerate in cases where there is unstructured control flow:
//
// if (q) goto mid;
// if (x > 9) {
// int b[100];
// memcpy(&b[0], ...);
// mid: b[k] = ...;
// abc(&b);
// }
//
// If in RPO ordering chosen to walk the CFG we happen to visit the b[k]
// before visiting the memcpy block (which will contain the lifetime start
// for "b" then it will appear that 'b' has a degenerate lifetime.
//
//===----------------------------------------------------------------------===//
// StackColoring Pass
//===----------------------------------------------------------------------===//
namespace {
/// StackColoring - A machine pass for merging disjoint stack allocations,
/// marked by the LIFETIME_START and LIFETIME_END pseudo instructions.
class StackColoring : public MachineFunctionPass {
MachineFrameInfo *MFI;
MachineFunction *MF;
/// A class representing liveness information for a single basic block.
/// Each bit in the BitVector represents the liveness property
/// for a different stack slot.
struct BlockLifetimeInfo {
/// Which slots BEGINs in each basic block.
BitVector Begin;
/// Which slots ENDs in each basic block.
BitVector End;
/// Which slots are marked as LIVE_IN, coming into each basic block.
BitVector LiveIn;
/// Which slots are marked as LIVE_OUT, coming out of each basic block.
BitVector LiveOut;
};
/// Maps active slots (per bit) for each basic block.
typedef DenseMap<const MachineBasicBlock*, BlockLifetimeInfo> LivenessMap;
LivenessMap BlockLiveness;
/// Maps serial numbers to basic blocks.
DenseMap<const MachineBasicBlock*, int> BasicBlocks;
/// Maps basic blocks to a serial number.
SmallVector<const MachineBasicBlock*, 8> BasicBlockNumbering;
/// Maps liveness intervals for each slot.
SmallVector<std::unique_ptr<LiveInterval>, 16> Intervals;
/// VNInfo is used for the construction of LiveIntervals.
VNInfo::Allocator VNInfoAllocator;
/// SlotIndex analysis object.
SlotIndexes *Indexes;
/// The stack protector object.
StackProtector *SP;
/// The list of lifetime markers found. These markers are to be removed
/// once the coloring is done.
SmallVector<MachineInstr*, 8> Markers;
/// Record the FI slots for which we have seen some sort of
/// lifetime marker (either start or end).
BitVector InterestingSlots;
/// FI slots that need to be handled conservatively (for these
/// slots lifetime-start-on-first-use is disabled).
BitVector ConservativeSlots;
/// Number of iterations taken during data flow analysis.
unsigned NumIterations;
public:
static char ID;
StackColoring() : MachineFunctionPass(ID) {
initializeStackColoringPass(*PassRegistry::getPassRegistry());
}
void getAnalysisUsage(AnalysisUsage &AU) const override;
bool runOnMachineFunction(MachineFunction &MF) override;
private:
/// Debug.
void dump() const;
void dumpIntervals() const;
void dumpBB(MachineBasicBlock *MBB) const;
void dumpBV(const char *tag, const BitVector &BV) const;
/// Removes all of the lifetime marker instructions from the function.
/// \returns true if any markers were removed.
bool removeAllMarkers();
/// Scan the machine function and find all of the lifetime markers.
/// Record the findings in the BEGIN and END vectors.
/// \returns the number of markers found.
unsigned collectMarkers(unsigned NumSlot);
/// Perform the dataflow calculation and calculate the lifetime for each of
/// the slots, based on the BEGIN/END vectors. Set the LifetimeLIVE_IN and
/// LifetimeLIVE_OUT maps that represent which stack slots are live coming
/// in and out blocks.
void calculateLocalLiveness();
/// Returns TRUE if we're using the first-use-begins-lifetime method for
/// this slot (if FALSE, then the start marker is treated as start of lifetime).
bool applyFirstUse(int Slot) {
if (!LifetimeStartOnFirstUse || ProtectFromEscapedAllocas)
return false;
if (ConservativeSlots.test(Slot))
return false;
return true;
}
/// Examines the specified instruction and returns TRUE if the instruction
/// represents the start or end of an interesting lifetime. The slot or slots
/// starting or ending are added to the vector "slots" and "isStart" is set
/// accordingly.
/// \returns True if inst contains a lifetime start or end
bool isLifetimeStartOrEnd(const MachineInstr &MI,
SmallVector<int, 4> &slots,
bool &isStart);
/// Construct the LiveIntervals for the slots.
void calculateLiveIntervals(unsigned NumSlots);
/// Go over the machine function and change instructions which use stack
/// slots to use the joint slots.
void remapInstructions(DenseMap<int, int> &SlotRemap);
/// The input program may contain instructions which are not inside lifetime
/// markers. This can happen due to a bug in the compiler or due to a bug in
/// user code (for example, returning a reference to a local variable).
/// This procedure checks all of the instructions in the function and
/// invalidates lifetime ranges which do not contain all of the instructions
/// which access that frame slot.
void removeInvalidSlotRanges();
/// Map entries which point to other entries to their destination.
/// A->B->C becomes A->C.
void expungeSlotMap(DenseMap<int, int> &SlotRemap, unsigned NumSlots);
/// Used in collectMarkers
typedef DenseMap<const MachineBasicBlock*, BitVector> BlockBitVecMap;
};
} // end anonymous namespace
char StackColoring::ID = 0;
char &llvm::StackColoringID = StackColoring::ID;
INITIALIZE_PASS_BEGIN(StackColoring,
"stack-coloring", "Merge disjoint stack slots", false, false)
INITIALIZE_PASS_DEPENDENCY(SlotIndexes)
INITIALIZE_PASS_DEPENDENCY(StackProtector)
INITIALIZE_PASS_END(StackColoring,
"stack-coloring", "Merge disjoint stack slots", false, false)
void StackColoring::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<SlotIndexes>();
AU.addRequired<StackProtector>();
MachineFunctionPass::getAnalysisUsage(AU);
}
#ifndef NDEBUG
LLVM_DUMP_METHOD void StackColoring::dumpBV(const char *tag,
const BitVector &BV) const {
DEBUG(dbgs() << tag << " : { ");
for (unsigned I = 0, E = BV.size(); I != E; ++I)
DEBUG(dbgs() << BV.test(I) << " ");
DEBUG(dbgs() << "}\n");
}
LLVM_DUMP_METHOD void StackColoring::dumpBB(MachineBasicBlock *MBB) const {
LivenessMap::const_iterator BI = BlockLiveness.find(MBB);
assert(BI != BlockLiveness.end() && "Block not found");
const BlockLifetimeInfo &BlockInfo = BI->second;
dumpBV("BEGIN", BlockInfo.Begin);
dumpBV("END", BlockInfo.End);
dumpBV("LIVE_IN", BlockInfo.LiveIn);
dumpBV("LIVE_OUT", BlockInfo.LiveOut);
}
LLVM_DUMP_METHOD void StackColoring::dump() const {
for (MachineBasicBlock *MBB : depth_first(MF)) {
DEBUG(dbgs() << "Inspecting block #" << MBB->getNumber() << " ["
<< MBB->getName() << "]\n");
DEBUG(dumpBB(MBB));
}
}
LLVM_DUMP_METHOD void StackColoring::dumpIntervals() const {
for (unsigned I = 0, E = Intervals.size(); I != E; ++I) {
DEBUG(dbgs() << "Interval[" << I << "]:\n");
DEBUG(Intervals[I]->dump());
}
}
#endif // not NDEBUG
static inline int getStartOrEndSlot(const MachineInstr &MI)
{
assert((MI.getOpcode() == TargetOpcode::LIFETIME_START ||
MI.getOpcode() == TargetOpcode::LIFETIME_END) &&
"Expected LIFETIME_START or LIFETIME_END op");
const MachineOperand &MO = MI.getOperand(0);
int Slot = MO.getIndex();
if (Slot >= 0)
return Slot;
return -1;
}
//
// At the moment the only way to end a variable lifetime is with
// a VARIABLE_LIFETIME op (which can't contain a start). If things
// change and the IR allows for a single inst that both begins
// and ends lifetime(s), this interface will need to be reworked.
//
bool StackColoring::isLifetimeStartOrEnd(const MachineInstr &MI,
SmallVector<int, 4> &slots,
bool &isStart)
{
if (MI.getOpcode() == TargetOpcode::LIFETIME_START ||
MI.getOpcode() == TargetOpcode::LIFETIME_END) {
int Slot = getStartOrEndSlot(MI);
if (Slot < 0)
return false;
if (!InterestingSlots.test(Slot))
return false;
slots.push_back(Slot);
if (MI.getOpcode() == TargetOpcode::LIFETIME_END) {
isStart = false;
return true;
}
if (! applyFirstUse(Slot)) {
isStart = true;
return true;
}
} else if (LifetimeStartOnFirstUse && !ProtectFromEscapedAllocas) {
if (! MI.isDebugValue()) {
bool found = false;
for (const MachineOperand &MO : MI.operands()) {
if (!MO.isFI())
continue;
int Slot = MO.getIndex();
if (Slot<0)
continue;
if (InterestingSlots.test(Slot) && applyFirstUse(Slot)) {
slots.push_back(Slot);
found = true;
}
}
if (found) {
isStart = true;
return true;
}
}
}
return false;
}
unsigned StackColoring::collectMarkers(unsigned NumSlot)
{
unsigned MarkersFound = 0;
BlockBitVecMap SeenStartMap;
InterestingSlots.clear();
InterestingSlots.resize(NumSlot);
ConservativeSlots.clear();
ConservativeSlots.resize(NumSlot);
// number of start and end lifetime ops for each slot
SmallVector<int, 8> NumStartLifetimes(NumSlot, 0);
SmallVector<int, 8> NumEndLifetimes(NumSlot, 0);
// Step 1: collect markers and populate the "InterestingSlots"
// and "ConservativeSlots" sets.
for (MachineBasicBlock *MBB : depth_first(MF)) {
// Compute the set of slots for which we've seen a START marker but have
// not yet seen an END marker at this point in the walk (e.g. on entry
// to this bb).
BitVector BetweenStartEnd;
BetweenStartEnd.resize(NumSlot);
for (MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(),
PE = MBB->pred_end(); PI != PE; ++PI) {
BlockBitVecMap::const_iterator I = SeenStartMap.find(*PI);
if (I != SeenStartMap.end()) {
BetweenStartEnd |= I->second;
}
}
// Walk the instructions in the block to look for start/end ops.
for (MachineInstr &MI : *MBB) {
if (MI.getOpcode() == TargetOpcode::LIFETIME_START ||
MI.getOpcode() == TargetOpcode::LIFETIME_END) {
int Slot = getStartOrEndSlot(MI);
if (Slot < 0)
continue;
InterestingSlots.set(Slot);
if (MI.getOpcode() == TargetOpcode::LIFETIME_START) {
BetweenStartEnd.set(Slot);
NumStartLifetimes[Slot] += 1;
} else {
BetweenStartEnd.reset(Slot);
NumEndLifetimes[Slot] += 1;
}
const AllocaInst *Allocation = MFI->getObjectAllocation(Slot);
if (Allocation) {
DEBUG(dbgs() << "Found a lifetime ");
DEBUG(dbgs() << (MI.getOpcode() == TargetOpcode::LIFETIME_START
? "start"
: "end"));
DEBUG(dbgs() << " marker for slot #" << Slot);
DEBUG(dbgs() << " with allocation: " << Allocation->getName()
<< "\n");
}
Markers.push_back(&MI);
MarkersFound += 1;
} else {
for (const MachineOperand &MO : MI.operands()) {
if (!MO.isFI())
continue;
int Slot = MO.getIndex();
if (Slot < 0)
continue;
if (! BetweenStartEnd.test(Slot)) {
ConservativeSlots.set(Slot);
}
}
}
}
BitVector &SeenStart = SeenStartMap[MBB];
SeenStart |= BetweenStartEnd;
}
if (!MarkersFound) {
return 0;
}
// PR27903: slots with multiple start or end lifetime ops are not
// safe to enable for "lifetime-start-on-first-use".
for (unsigned slot = 0; slot < NumSlot; ++slot)
if (NumStartLifetimes[slot] > 1 || NumEndLifetimes[slot] > 1)
ConservativeSlots.set(slot);
DEBUG(dumpBV("Conservative slots", ConservativeSlots));
// Step 2: compute begin/end sets for each block
// NOTE: We use a reverse-post-order iteration to ensure that we obtain a
// deterministic numbering, and because we'll need a post-order iteration
// later for solving the liveness dataflow problem.
for (MachineBasicBlock *MBB : depth_first(MF)) {
// Assign a serial number to this basic block.
BasicBlocks[MBB] = BasicBlockNumbering.size();
BasicBlockNumbering.push_back(MBB);
// Keep a reference to avoid repeated lookups.
BlockLifetimeInfo &BlockInfo = BlockLiveness[MBB];
BlockInfo.Begin.resize(NumSlot);
BlockInfo.End.resize(NumSlot);
SmallVector<int, 4> slots;
for (MachineInstr &MI : *MBB) {
bool isStart = false;
slots.clear();
if (isLifetimeStartOrEnd(MI, slots, isStart)) {
if (!isStart) {
assert(slots.size() == 1 && "unexpected: MI ends multiple slots");
int Slot = slots[0];
if (BlockInfo.Begin.test(Slot)) {
BlockInfo.Begin.reset(Slot);
}
BlockInfo.End.set(Slot);
} else {
for (auto Slot : slots) {
DEBUG(dbgs() << "Found a use of slot #" << Slot);
DEBUG(dbgs() << " at BB#" << MBB->getNumber() << " index ");
DEBUG(Indexes->getInstructionIndex(MI).print(dbgs()));
const AllocaInst *Allocation = MFI->getObjectAllocation(Slot);
if (Allocation) {
DEBUG(dbgs() << " with allocation: "<< Allocation->getName());
}
DEBUG(dbgs() << "\n");
if (BlockInfo.End.test(Slot)) {
BlockInfo.End.reset(Slot);
}
BlockInfo.Begin.set(Slot);
}
}
}
}
}
// Update statistics.
NumMarkerSeen += MarkersFound;
return MarkersFound;
}
void StackColoring::calculateLocalLiveness()
{
unsigned NumIters = 0;
bool changed = true;
while (changed) {
changed = false;
++NumIters;
for (const MachineBasicBlock *BB : BasicBlockNumbering) {
// Use an iterator to avoid repeated lookups.
LivenessMap::iterator BI = BlockLiveness.find(BB);
assert(BI != BlockLiveness.end() && "Block not found");
BlockLifetimeInfo &BlockInfo = BI->second;
// Compute LiveIn by unioning together the LiveOut sets of all preds.
BitVector LocalLiveIn;
for (MachineBasicBlock::const_pred_iterator PI = BB->pred_begin(),
PE = BB->pred_end(); PI != PE; ++PI) {
LivenessMap::const_iterator I = BlockLiveness.find(*PI);
assert(I != BlockLiveness.end() && "Predecessor not found");
LocalLiveIn |= I->second.LiveOut;
}
// Compute LiveOut by subtracting out lifetimes that end in this
// block, then adding in lifetimes that begin in this block. If
// we have both BEGIN and END markers in the same basic block
// then we know that the BEGIN marker comes after the END,
// because we already handle the case where the BEGIN comes
// before the END when collecting the markers (and building the
// BEGIN/END vectors).
BitVector LocalLiveOut = LocalLiveIn;
LocalLiveOut.reset(BlockInfo.End);
LocalLiveOut |= BlockInfo.Begin;
// Update block LiveIn set, noting whether it has changed.
if (LocalLiveIn.test(BlockInfo.LiveIn)) {
changed = true;
BlockInfo.LiveIn |= LocalLiveIn;
}
// Update block LiveOut set, noting whether it has changed.
if (LocalLiveOut.test(BlockInfo.LiveOut)) {
changed = true;
BlockInfo.LiveOut |= LocalLiveOut;
}
}
}// while changed.
NumIterations = NumIters;
}
void StackColoring::calculateLiveIntervals(unsigned NumSlots) {
SmallVector<SlotIndex, 16> Starts;
SmallVector<SlotIndex, 16> Finishes;
// For each block, find which slots are active within this block
// and update the live intervals.
for (const MachineBasicBlock &MBB : *MF) {
Starts.clear();
Starts.resize(NumSlots);
Finishes.clear();
Finishes.resize(NumSlots);
// Create the interval for the basic blocks containing lifetime begin/end.
for (const MachineInstr &MI : MBB) {
SmallVector<int, 4> slots;
bool IsStart = false;
if (!isLifetimeStartOrEnd(MI, slots, IsStart))
continue;
SlotIndex ThisIndex = Indexes->getInstructionIndex(MI);
for (auto Slot : slots) {
if (IsStart) {
if (!Starts[Slot].isValid() || Starts[Slot] > ThisIndex)
Starts[Slot] = ThisIndex;
} else {
if (!Finishes[Slot].isValid() || Finishes[Slot] < ThisIndex)
Finishes[Slot] = ThisIndex;
}
}
}
// Create the interval of the blocks that we previously found to be 'alive'.
BlockLifetimeInfo &MBBLiveness = BlockLiveness[&MBB];
for (int pos = MBBLiveness.LiveIn.find_first(); pos != -1;
pos = MBBLiveness.LiveIn.find_next(pos)) {
Starts[pos] = Indexes->getMBBStartIdx(&MBB);
}
for (int pos = MBBLiveness.LiveOut.find_first(); pos != -1;
pos = MBBLiveness.LiveOut.find_next(pos)) {
Finishes[pos] = Indexes->getMBBEndIdx(&MBB);
}
for (unsigned i = 0; i < NumSlots; ++i) {
//
// When LifetimeStartOnFirstUse is turned on, data flow analysis
// is forward (from starts to ends), not bidirectional. A
// consequence of this is that we can wind up in situations
// where Starts[i] is invalid but Finishes[i] is valid and vice
// versa. Example:
//
// LIFETIME_START x
// if (...) {
// <use of x>
// throw ...;
// }
// LIFETIME_END x
// return 2;
//
//
// Here the slot for "x" will not be live into the block
// containing the "return 2" (since lifetimes start with first
// use, not at the dominating LIFETIME_START marker).
//
if (Starts[i].isValid() && !Finishes[i].isValid()) {
Finishes[i] = Indexes->getMBBEndIdx(&MBB);
}
if (!Starts[i].isValid())
continue;
assert(Starts[i] && Finishes[i] && "Invalid interval");
VNInfo *ValNum = Intervals[i]->getValNumInfo(0);
SlotIndex S = Starts[i];
SlotIndex F = Finishes[i];
if (S < F) {
// We have a single consecutive region.
Intervals[i]->addSegment(LiveInterval::Segment(S, F, ValNum));
} else {
// We have two non-consecutive regions. This happens when
// LIFETIME_START appears after the LIFETIME_END marker.
SlotIndex NewStart = Indexes->getMBBStartIdx(&MBB);
SlotIndex NewFin = Indexes->getMBBEndIdx(&MBB);
Intervals[i]->addSegment(LiveInterval::Segment(NewStart, F, ValNum));
Intervals[i]->addSegment(LiveInterval::Segment(S, NewFin, ValNum));
}
}
}
}
bool StackColoring::removeAllMarkers() {
unsigned Count = 0;
for (MachineInstr *MI : Markers) {
MI->eraseFromParent();
Count++;
}
Markers.clear();
DEBUG(dbgs()<<"Removed "<<Count<<" markers.\n");
return Count;
}
void StackColoring::remapInstructions(DenseMap<int, int> &SlotRemap) {
unsigned FixedInstr = 0;
unsigned FixedMemOp = 0;
unsigned FixedDbg = 0;
// Remap debug information that refers to stack slots.
for (auto &VI : MF->getVariableDbgInfo()) {
if (!VI.Var)
continue;
if (SlotRemap.count(VI.Slot)) {
DEBUG(dbgs() << "Remapping debug info for ["
<< cast<DILocalVariable>(VI.Var)->getName() << "].\n");
VI.Slot = SlotRemap[VI.Slot];
FixedDbg++;
}
}
// Keep a list of *allocas* which need to be remapped.
DenseMap<const AllocaInst*, const AllocaInst*> Allocas;
for (const std::pair<int, int> &SI : SlotRemap) {
const AllocaInst *From = MFI->getObjectAllocation(SI.first);
const AllocaInst *To = MFI->getObjectAllocation(SI.second);
assert(To && From && "Invalid allocation object");
Allocas[From] = To;
// AA might be used later for instruction scheduling, and we need it to be
// able to deduce the correct aliasing releationships between pointers
// derived from the alloca being remapped and the target of that remapping.
// The only safe way, without directly informing AA about the remapping
// somehow, is to directly update the IR to reflect the change being made
// here.
Instruction *Inst = const_cast<AllocaInst *>(To);
if (From->getType() != To->getType()) {
BitCastInst *Cast = new BitCastInst(Inst, From->getType());
Cast->insertAfter(Inst);
Inst = Cast;
}
// Allow the stack protector to adjust its value map to account for the
// upcoming replacement.
SP->adjustForColoring(From, To);
// The new alloca might not be valid in a llvm.dbg.declare for this
// variable, so undef out the use to make the verifier happy.
AllocaInst *FromAI = const_cast<AllocaInst *>(From);
if (FromAI->isUsedByMetadata())
ValueAsMetadata::handleRAUW(FromAI, UndefValue::get(FromAI->getType()));
for (auto &Use : FromAI->uses()) {
if (BitCastInst *BCI = dyn_cast<BitCastInst>(Use.get()))
if (BCI->isUsedByMetadata())
ValueAsMetadata::handleRAUW(BCI, UndefValue::get(BCI->getType()));
}
// Note that this will not replace uses in MMOs (which we'll update below),
// or anywhere else (which is why we won't delete the original
// instruction).
FromAI->replaceAllUsesWith(Inst);
}
// Remap all instructions to the new stack slots.
for (MachineBasicBlock &BB : *MF)
for (MachineInstr &I : BB) {
// Skip lifetime markers. We'll remove them soon.
if (I.getOpcode() == TargetOpcode::LIFETIME_START ||
I.getOpcode() == TargetOpcode::LIFETIME_END)
continue;
// Update the MachineMemOperand to use the new alloca.
for (MachineMemOperand *MMO : I.memoperands()) {
// FIXME: In order to enable the use of TBAA when using AA in CodeGen,
// we'll also need to update the TBAA nodes in MMOs with values
// derived from the merged allocas. When doing this, we'll need to use
// the same variant of GetUnderlyingObjects that is used by the
// instruction scheduler (that can look through ptrtoint/inttoptr
// pairs).
// We've replaced IR-level uses of the remapped allocas, so we only
// need to replace direct uses here.
const AllocaInst *AI = dyn_cast_or_null<AllocaInst>(MMO->getValue());
if (!AI)
continue;
if (!Allocas.count(AI))
continue;
MMO->setValue(Allocas[AI]);
FixedMemOp++;
}
// Update all of the machine instruction operands.
for (MachineOperand &MO : I.operands()) {
if (!MO.isFI())
continue;
int FromSlot = MO.getIndex();
// Don't touch arguments.
if (FromSlot<0)
continue;
// Only look at mapped slots.
if (!SlotRemap.count(FromSlot))
continue;
// In a debug build, check that the instruction that we are modifying is
// inside the expected live range. If the instruction is not inside
// the calculated range then it means that the alloca usage moved
// outside of the lifetime markers, or that the user has a bug.
// NOTE: Alloca address calculations which happen outside the lifetime
// zone are are okay, despite the fact that we don't have a good way
// for validating all of the usages of the calculation.
#ifndef NDEBUG
bool TouchesMemory = I.mayLoad() || I.mayStore();
// If we *don't* protect the user from escaped allocas, don't bother
// validating the instructions.
if (!I.isDebugValue() && TouchesMemory && ProtectFromEscapedAllocas) {
SlotIndex Index = Indexes->getInstructionIndex(I);
const LiveInterval *Interval = &*Intervals[FromSlot];
assert(Interval->find(Index) != Interval->end() &&
"Found instruction usage outside of live range.");
}
#endif
// Fix the machine instructions.
int ToSlot = SlotRemap[FromSlot];
MO.setIndex(ToSlot);
FixedInstr++;
}
}
// Update the location of C++ catch objects for the MSVC personality routine.
if (WinEHFuncInfo *EHInfo = MF->getWinEHFuncInfo())
for (WinEHTryBlockMapEntry &TBME : EHInfo->TryBlockMap)
for (WinEHHandlerType &H : TBME.HandlerArray)
if (H.CatchObj.FrameIndex != INT_MAX &&
SlotRemap.count(H.CatchObj.FrameIndex))
H.CatchObj.FrameIndex = SlotRemap[H.CatchObj.FrameIndex];
DEBUG(dbgs()<<"Fixed "<<FixedMemOp<<" machine memory operands.\n");
DEBUG(dbgs()<<"Fixed "<<FixedDbg<<" debug locations.\n");
DEBUG(dbgs()<<"Fixed "<<FixedInstr<<" machine instructions.\n");
}
void StackColoring::removeInvalidSlotRanges() {
for (MachineBasicBlock &BB : *MF)
for (MachineInstr &I : BB) {
if (I.getOpcode() == TargetOpcode::LIFETIME_START ||
I.getOpcode() == TargetOpcode::LIFETIME_END || I.isDebugValue())
continue;
// Some intervals are suspicious! In some cases we find address
// calculations outside of the lifetime zone, but not actual memory
// read or write. Memory accesses outside of the lifetime zone are a clear
// violation, but address calculations are okay. This can happen when
// GEPs are hoisted outside of the lifetime zone.
// So, in here we only check instructions which can read or write memory.
if (!I.mayLoad() && !I.mayStore())
continue;
// Check all of the machine operands.
for (const MachineOperand &MO : I.operands()) {
if (!MO.isFI())
continue;
int Slot = MO.getIndex();
if (Slot<0)
continue;
if (Intervals[Slot]->empty())
continue;
// Check that the used slot is inside the calculated lifetime range.
// If it is not, warn about it and invalidate the range.
LiveInterval *Interval = &*Intervals[Slot];
SlotIndex Index = Indexes->getInstructionIndex(I);
if (Interval->find(Index) == Interval->end()) {
Interval->clear();
DEBUG(dbgs()<<"Invalidating range #"<<Slot<<"\n");
EscapedAllocas++;
}
}
}
}
void StackColoring::expungeSlotMap(DenseMap<int, int> &SlotRemap,
unsigned NumSlots) {
// Expunge slot remap map.
for (unsigned i=0; i < NumSlots; ++i) {
// If we are remapping i
if (SlotRemap.count(i)) {
int Target = SlotRemap[i];
// As long as our target is mapped to something else, follow it.
while (SlotRemap.count(Target)) {
Target = SlotRemap[Target];
SlotRemap[i] = Target;
}
}
}
}
bool StackColoring::runOnMachineFunction(MachineFunction &Func) {
DEBUG(dbgs() << "********** Stack Coloring **********\n"
<< "********** Function: "
<< ((const Value*)Func.getFunction())->getName() << '\n');
MF = &Func;
MFI = &MF->getFrameInfo();
Indexes = &getAnalysis<SlotIndexes>();
SP = &getAnalysis<StackProtector>();
BlockLiveness.clear();
BasicBlocks.clear();
BasicBlockNumbering.clear();
Markers.clear();
Intervals.clear();
VNInfoAllocator.Reset();
unsigned NumSlots = MFI->getObjectIndexEnd();
// If there are no stack slots then there are no markers to remove.
if (!NumSlots)
return false;
SmallVector<int, 8> SortedSlots;
SortedSlots.reserve(NumSlots);
Intervals.reserve(NumSlots);
unsigned NumMarkers = collectMarkers(NumSlots);
unsigned TotalSize = 0;
DEBUG(dbgs()<<"Found "<<NumMarkers<<" markers and "<<NumSlots<<" slots\n");
DEBUG(dbgs()<<"Slot structure:\n");
for (int i=0; i < MFI->getObjectIndexEnd(); ++i) {
DEBUG(dbgs()<<"Slot #"<<i<<" - "<<MFI->getObjectSize(i)<<" bytes.\n");
TotalSize += MFI->getObjectSize(i);
}
DEBUG(dbgs()<<"Total Stack size: "<<TotalSize<<" bytes\n\n");
// Don't continue because there are not enough lifetime markers, or the
// stack is too small, or we are told not to optimize the slots.
if (NumMarkers < 2 || TotalSize < 16 || DisableColoring ||
skipFunction(*Func.getFunction())) {
DEBUG(dbgs()<<"Will not try to merge slots.\n");
return removeAllMarkers();
}
for (unsigned i=0; i < NumSlots; ++i) {
std::unique_ptr<LiveInterval> LI(new LiveInterval(i, 0));
LI->getNextValue(Indexes->getZeroIndex(), VNInfoAllocator);
Intervals.push_back(std::move(LI));
SortedSlots.push_back(i);
}
// Calculate the liveness of each block.
calculateLocalLiveness();
DEBUG(dbgs() << "Dataflow iterations: " << NumIterations << "\n");
DEBUG(dump());
// Propagate the liveness information.
calculateLiveIntervals(NumSlots);
DEBUG(dumpIntervals());
// Search for allocas which are used outside of the declared lifetime
// markers.
if (ProtectFromEscapedAllocas)
removeInvalidSlotRanges();
// Maps old slots to new slots.
DenseMap<int, int> SlotRemap;
unsigned RemovedSlots = 0;
unsigned ReducedSize = 0;
// Do not bother looking at empty intervals.
for (unsigned I = 0; I < NumSlots; ++I) {
if (Intervals[SortedSlots[I]]->empty())
SortedSlots[I] = -1;
}
// This is a simple greedy algorithm for merging allocas. First, sort the
// slots, placing the largest slots first. Next, perform an n^2 scan and look
// for disjoint slots. When you find disjoint slots, merge the samller one
// into the bigger one and update the live interval. Remove the small alloca
// and continue.
// Sort the slots according to their size. Place unused slots at the end.
// Use stable sort to guarantee deterministic code generation.
std::stable_sort(SortedSlots.begin(), SortedSlots.end(),
[this](int LHS, int RHS) {
// We use -1 to denote a uninteresting slot. Place these slots at the end.
if (LHS == -1) return false;
if (RHS == -1) return true;
// Sort according to size.
return MFI->getObjectSize(LHS) > MFI->getObjectSize(RHS);
});
bool Changed = true;
while (Changed) {
Changed = false;
for (unsigned I = 0; I < NumSlots; ++I) {
if (SortedSlots[I] == -1)
continue;
for (unsigned J=I+1; J < NumSlots; ++J) {
if (SortedSlots[J] == -1)
continue;
int FirstSlot = SortedSlots[I];
int SecondSlot = SortedSlots[J];
LiveInterval *First = &*Intervals[FirstSlot];
LiveInterval *Second = &*Intervals[SecondSlot];
assert (!First->empty() && !Second->empty() && "Found an empty range");
// Merge disjoint slots.
if (!First->overlaps(*Second)) {
Changed = true;
First->MergeSegmentsInAsValue(*Second, First->getValNumInfo(0));
SlotRemap[SecondSlot] = FirstSlot;
SortedSlots[J] = -1;
DEBUG(dbgs()<<"Merging #"<<FirstSlot<<" and slots #"<<
SecondSlot<<" together.\n");
unsigned MaxAlignment = std::max(MFI->getObjectAlignment(FirstSlot),
MFI->getObjectAlignment(SecondSlot));
assert(MFI->getObjectSize(FirstSlot) >=
MFI->getObjectSize(SecondSlot) &&
"Merging a small object into a larger one");
RemovedSlots+=1;
ReducedSize += MFI->getObjectSize(SecondSlot);
MFI->setObjectAlignment(FirstSlot, MaxAlignment);
MFI->RemoveStackObject(SecondSlot);
}
}
}
}// While changed.
// Record statistics.
StackSpaceSaved += ReducedSize;
StackSlotMerged += RemovedSlots;
DEBUG(dbgs()<<"Merge "<<RemovedSlots<<" slots. Saved "<<
ReducedSize<<" bytes\n");
// Scan the entire function and update all machine operands that use frame
// indices to use the remapped frame index.
expungeSlotMap(SlotRemap, NumSlots);
remapInstructions(SlotRemap);
return removeAllMarkers();
}
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