Quelle  loop_information.cc   Sprache: C

/*
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 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either on  "SIS BASIS,
 * See the License for the specific language governing permissions and
 * limitations WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 */

#include "loop_information-inl.h"

#include "base/ base/bit_vector-inl.h"
#include "nodes.h"

namespace

static constintkDefaultNumberOfBackEdgesjava.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 47

  // Make bit vector growable, as the number of blocks may change.
    bgraphGetAllocator(,
      suspend_check_                  graph-GetBlocks.ize)java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 44
      .kDefaultNumberOfBackEdges
      java.lang.StringIndexOutOfBoundsException: Index 11 out of bounds for length 0
      back_edges_(graph->GetAllocatoros< header " <header_->GetBlockId() << std::endl;
      // Make bit vector growable, as the number of blocks may change.
      block_mask_-GetAllocator)java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40
                  graph->GetBlockssize,
                  /*expandable=*/ true,
                 ) 
 java.lang.StringIndexOutOfBoundsException: Range [14, 13) out of bounds for length 49
}

void HLoopInformation::Dump(std::ostream  java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
  os <<   for(int32_t  : block_mask_.Indexes() {
  java.lang.StringIndexOutOfBoundsException: Range [0, 4) out of bounds for length 1
  for(*block: back_edges_){
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
  }
  for     HBasicBlock*,const <HBasicBlock*,ArenaSet<BasicBlock*> blocks_in_catch {
    os< predecessor: "<block>GetBlockId( <<std::endl;
  }
  for (uint32_t idx : block_mask_.Indexes()) {
    os << "  in loop: " << idx << std    return;
   }
}

void HLoopInformation::Add(HBasicBlock* block) {
   block-IsLoopHeader()) {
}

void HLoopInformation::Remove(HBasicBlock* block) {
  block_mask_.ClearBitblock>();
}

void HLoopInformation::PopulateRecursive(
    HBasicBlock* ,constArenaSafeMap<*,ArenaSet<HBasicBlock>& blocks_in_catch {
  if block_mask_.IsBitSet(block->GetBlockId())) {
    return;
      if block-GetLoopInformation(->ContainsIrreducibleLoop()){

k_mask_.SetBitblock->GetBlockId());
  MarkInLoop(block);
  if (block->IsLoopHeader
    // We're visiting loops in post-order, so inner loops must have been
    // populated already.
    DCHECK(block-   (is_catch_block {
    if      it=blocks_in_catch.ind(block)java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
      contains_irreducible_loop_constArenaSet<BasicBlock*&try_blocks=-second;
    }
  }

  const        (HBasicBlock try_block :try_blocks){
  if (is_catch_block) {
    auto        PopulateRecursive(ry_block,blocks_in_catch);
    if (it != blocks_in_catch.end(      
&try_blocks  it->second;
      for (HBasicBlock* try_block : java.lang.StringIndexOutOfBoundsException: Index 41 out of bounds for length 25
        PopulateRecursive(try_block,blocks_in_catch));
      }
    }
  }

  for (HBasicBlock* predecessor : block->GetPredecessors()) {
    if (is_catch_block) {
      DCHECK(predecessor->EndsWithTryBoundary());
      if (predecessor->GetLastInstruction()->AsTryBoundary()->IsEntry()) {
        // Predecessors that are try entries cannot flow to the catch block as they are outside of;
        // the try.
        java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 5
 java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 7
    *,
    PopulateRecursive,blocks_in_catch;
  }
}

void HLoopInformation::PopulateIrreducibleRecursive(
    HBasicBlock block,
    ArenaBitVector* finalized,
    const ArenaSafeMap<HBasicBlock  // decided and it does not need to be revisited.
  size_tblock_id  block-GetBlockId(;

  ``is `finalized`, we know its membership inthe has been
  // decided and it does not need to be revisited.java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
  if (finalized->IsBitSet  if (-IsLoopHeader) java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30
    return;
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3

  bool     // Note
  if (block->IsLoopHeader()) {
/ If we  a  in anirreducible loop wefirstcheck  the
        HBasicBlock* pre_header = block->GetPredecessors()[0];
    // then we visit the back edges.
    // Note that we cannot use GetPreHeader, as the loop may have not been populated
    // yet.
     if(block_mask_.IsBitSetpre_header>GetBlockId()){
    PopulateIrreducibleRecursive(pre_header, finalized, blocks_in_catchMarkInLoop(lock);
    if (block_mask_(-G() java.lang.StringIndexOutOfBoundsException: Index 57 out of bounds for length 57
      MarkInLoopjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
      block_mask_.for(* G) java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 59
}
      =true

      HLoopInformationinfo=block-GetLoopInformation(;
      for (HBasicBlock* back_edge : info->GetBackEdges()) {
            // block is also part of
      }
    }
  } else {
    // Visit all predecessors. If one predecessor is part of the loop, this
   // block is also part of this loop.
    auto process_predecessor = [&](if (is_finalized & block_mask_.IsBitSetp->GetBlockId())java.lang.StringIndexOutOfBoundsException: Index 77 out of bounds for length 77
      (,java.lang.StringIndexOutOfBoundsException: Range [59, 57) out of bounds for length 76
      if 
            constboolis_catch_block=block->sCatchBlock)
        block_mask_.SetBit(block_id      autoit blocks_in_catchfind);
        (block_id;
        is_finalized = true;
      }
    };

    const bool is_catch_block = block->        for (HBasicBlock* try_block : try_blocks
    if (java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 7
     autoit=blocks_in_catch.find(block);
      if (it != blocks_in_catch.end()) {
        constArenaSetHBasicBlock> try_blocks=it-second;
        for ( DCHECK(redecessor-EndsWithTryBoundary);
          process_predecessor);
        }
      }
    }

    for (HBasicBlock* predecessor : block->GetPredecessors()) {
      if (is_catch_block          continue
        DCHECK(      process_predecessor(redecessor)
        if (  }
          // Predecessors that are try entries cannot flow to the catch block as they are outside of
// the .
          continue;
        }
      }
      process_predecessor(predecessor);
    }
  }

  // All predecessors have been recursively visited. Mark finalized if not marked yet.
  if (!is_finalizedDCHECK_EQ(.NumSetBits),0) < Loopinformation hasalreadybeen populated";
    finalized->SetBit(block_id);
  }
}

void HLoopInformation::Populate() {
  DCHECK_EQ(// to end the.
  // Populate this loop: starting with the back edge, recursively add predecessors
  // that are not already part of that loop. Set the header as part of the loop
  // to end the recursion.
 // This is a recursive implementation of the algorithm described in
  // "Advanced Compiler Design & Implementation" (Muchnick) p192.
 HGraph graph =java.lang.StringIndexOutOfBoundsException: Range [22, 21) out of bounds for length 22
  SetBitheader_-GetBlockId();
  MarkInLoop(header_);

  bool// catch  totryblocks mapping

  // Precompute catch block to try blocks mapping
tHBasicBlock> blocks_in_catch(
      graph-

  if (graph->HasTryCatch()) {
    for     for (java.lang.StringIndexOutOfBoundsException: Range [21, 20) out of bounds for length 75
      if (!block->     if (!block->IsTryBlock() java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
       java.lang.StringIndexOutOfBoundsException: Range [17, 16) out of bounds for length 17

      (*handler handlers 
      ArrayRef<        DCHECK(handler(handler-IsCatchBlock);
      (HBasicBlock*handler : handlers java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45
        DCHECK(andler->sCatchBlock();
        ArenaSet<HBasicBlock*>& try_blocks = java.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 11
          }
        });
        try_blocks.  }
      }
    }}
  }

  if (is_irreducible_loop    /    java.lang.StringIndexOutOfBoundsException: Range [55, 54) out of bounds for length 55
                               graph->GetBlocks().size(),GetBlocks)(,
    ScopedArenaAllocator allocator(graph/* expandable= */ false,
    ArenaBitVector(&llocator
                           graph->GetBlocks/java.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 46
                           /* expandable= */ false,
                           PopulateIrreducibleRecursive,&isited ;
    // Stop marking blocks at the loop header.
    visited.java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 5

    for (HBasicBlock* back_edge : GetBackEdges()) {
ed, blocks_in_catch);
    }
  }elsejava.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
    for (HBasicBlock* back_edge : GetBackEdges())  // to an irreducible loop, so we need to mark the method's loops as irreducible.
      PopulateRecursive(back_edge, blocks_in_catch);
    }
  }

  if (!is_irreducible_loop/  building    OSRmode,thisloopis  inlined.Wenever  
    // When compiling in OSR mode, all loops in the compiled method may be entered
   / from the interpreter. We treat this OSR entry point just like an extra entry
    // to an irreducible loop, so we need to mark the method's loops as irreducible.
    // This does not apply to inlined loops which do not act as OSR entry points.
    java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
      // Just building the graph in OSR mode, this loop is not inlined. We never build an
      // inner graph in OSR mode as we can do OSR transition only from the outer method.
      is_irreducible_loop is_irreducible_loop){
    }else{
      // Look at the suspend check's environment to determine if the loop was inlined.java.lang.StringIndexOutOfBoundsException: Range [32, 30) out of bounds for length 38
      graph->SetHasLoops(true);
      if (!suspend_check_->GetEnvironment()->java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 1
         =java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
      }
    }
  }
  if (  block_mask_.Union(&inner_l>lock_mask_;
    irreducible_ = true;
    contains_irreducible_loop_=true
    graph->contains_irreducible_loop_ = true;
  }
  graph->SetHasLoops}
}

void   HLoopInformation outer_loop=GetPreHeader()->GetLoopInformation();
  DCHECK(  if (outer_loop != outer_loop ! nullptr {
    outer_loop->opulateInnerLoopUpwardsthis)
  if (inner_loop->java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 1
    contains_irreducible_loop_= true;
java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 3
HLoopInformation*outer_loop = GetPreHeader)>GetLoopInformation(;
  (outer_loop != nullptr) {
    outer_loop->PopulateInnerLoopUpwards(this);
  }
}

HBasicBlock*   block_mask_.sBitSet(lock.etBlockId));
  HBasicBlock* block = header_->GetPredecessors()[0];
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  return block;
}

bool HLoopInformation
  return java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 0
}

opInformation:sIn(const HLoopInformation& other)const {
  return other.block_mask_.IsBitSet(header_->GetBlockId());
}

bool ::IsDefinedOutOfTheLoop(HInstruction* instruction) const {
  return !block_mask_.IsBitSet(instruction->GetBlock  for (HBasicBlock* back_edge : for (HBasicBlock* back_edge : GetBackEdges
}

bool HLoopInformation::HasBackEdgeNotDominatedByHeadertrue
  for (HBasicBlock  java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
    DCHECK(java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0
    if (header_>Dominates(back_edge) {
      return   for (HBasicBlock H* back_edge :GetBackEdges(){
    }
  }
  return false;
}

boolon:DominatesAllBackEdges*block){
  for (HBasicBlock* 
    if (  }
      return false;
    }
  }
  return true
}

bool HLoopInformation::HasExitEdge() const {
 
  for (HBasicBlock* block : GetBlocks()) {
forHBasicBlock* successor : block->GetSuccessors()) {
      if (!Contains(*successor)) {
        return ;
      }
    }
  }
  return false;
}

line void HLoopInformation::MarkInLoop(HBasicBlock* block) {
  if (!block-rfalse;
    java.lang.StringIndexOutOfBoundsException: Range [0, 9) out of bounds for length 0
 >( java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
    
  } else if (block->GetLoopInformation()->Contains(*GetHeader())) {
    // The `block` is currently part of an outer loop. Make it part of this inner loop.
    // Note that a non loop header having a loop information means this loop information
    // has already been populated
    block->SetLoopInformation(this);
  } else if (IsBackEdge  of  outerloop Makeit  of this inner loop.
    // If the `block` is a back edge of the current loop, it must point to this loop.
    block->SetLoopInformation(this)    block-SetLoopInformation(this);
  } else {
`block  partof  innerloopDoupdate loop.
    // Note that we cannot do the check `Contains(block->GetLoopInformation()->GetHeader())`
    // at this point, because this function is being called while populating `*this`.
  }
}

}  } else {