[arm] Decrease the size of the assembler class by allocating buffers of pending constants on the he…

src/arm/assembler-arm.h

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 1447 matching lines @@
   static int DecodeShiftImm(Instr instr);
   static Instr PatchShiftImm(Instr instr, int immed);
 
   // Constants in pools are accessed via pc relative addressing, which can
   // reach +/-4KB for integer PC-relative loads and +/-1KB for floating-point
   // PC-relative loads, thereby defining a maximum distance between the
   // instruction and the accessed constant.
   static const int kMaxDistToIntPool = 4*KB;
   static const int kMaxDistToFPPool = 1*KB;
   // All relocations could be integer, it therefore acts as the limit.
+  static const int kMinNumPendingConstants = 4;
   static const int kMaxNumPending32Constants = kMaxDistToIntPool / kInstrSize;
   static const int kMaxNumPending64Constants = kMaxDistToFPPool / kInstrSize;
 
   // Postpone the generation of the constant pool for the specified number of
   // instructions.
   void BlockConstPoolFor(int instructions);
 
   // Check if is time to emit a constant pool.
   void CheckConstPool(bool force_emit, bool require_jump);
 
@@ skipping 113 matching lines @@
   RelocInfoWriter reloc_info_writer;
 
   // ConstantPoolEntry records are used during code generation as temporary
   // containers for constants and code target addresses until they are emitted
   // to the constant pool. These records are temporarily stored in a separate
   // buffer until a constant pool is emitted.
   // If every instruction in a long sequence is accessing the pool, we need one
   // pending relocation entry per instruction.
 
   // The buffers of pending constant pool entries.
-  ConstantPoolEntry pending_32_bit_constants_[kMaxNumPending32Constants];
-  ConstantPoolEntry pending_64_bit_constants_[kMaxNumPending64Constants];
+  ConstantPoolEntry pending_32_bit_constants_buffer_[kMinNumPendingConstants];
+  ConstantPoolEntry pending_64_bit_constants_buffer_[kMinNumPendingConstants];
+  ConstantPoolEntry* pending_32_bit_constants_;
+  ConstantPoolEntry* pending_64_bit_constants_;
   // Number of pending constant pool entries in the 32 bits buffer.
   int num_pending_32_bit_constants_;
   // Number of pending constant pool entries in the 64 bits buffer.
   int num_pending_64_bit_constants_;
 
   ConstantPoolBuilder constant_pool_builder_;
 
   // The bound position, before this we cannot do instruction elimination.
   int last_bound_pos_;
 
@@ skipping 39 matching lines @@
  public:
   explicit EnsureSpace(Assembler* assembler) {
     assembler->CheckBuffer();
   }
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ARM_ASSEMBLER_ARM_H_