zra@google.com
7c91e88e6e
When we detect ARMv6, instead of using movw and movt, this change loads each individual byte. Although this is not the best way to achieve this, a modification to store large constants in the object pool would be more invasive. Further, this change will be easier to back-out once ARMv6 is obsolete. R=regis@google.com Review URL: https://codereview.chromium.org//183803024 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@33442 260f80e4-7a28-3924-810f-c04153c831b5
102 lines
3.2 KiB
C++
102 lines
3.2 KiB
C++
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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// Classes that describe assembly patterns as used by inline caches.
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#ifndef VM_INSTRUCTIONS_ARM_H_
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#define VM_INSTRUCTIONS_ARM_H_
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#ifndef VM_INSTRUCTIONS_H_
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#error Do not include instructions_arm.h directly; use instructions.h instead.
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#endif
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#include "vm/constants_arm.h"
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#include "vm/object.h"
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namespace dart {
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class InstructionPattern : public AllStatic {
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public:
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// Decodes a load sequence ending at 'end' (the last instruction of the
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// load sequence is the instruction before the one at end). Returns the
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// address of the first instruction in the sequence. Returns the register
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// being loaded and the loaded object in the output parameters 'reg' and
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// 'obj' respectively.
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static uword DecodeLoadObject(uword end,
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const Array& object_pool,
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Register* reg,
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Object* obj);
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// Decodes a load sequence ending at 'end' (the last instruction of the
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// load sequence is the instruction before the one at end). Returns the
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// address of the first instruction in the sequence. Returns the register
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// being loaded and the loaded immediate value in the output parameters
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// 'reg' and 'value' respectively.
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static uword DecodeLoadWordImmediate(uword end,
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Register* reg,
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intptr_t* value);
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// Decodes a load sequence ending at 'end' (the last instruction of the
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// load sequence is the instruction before the one at end). Returns the
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// address of the first instruction in the sequence. Returns the register
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// being loaded and the index in the pool being read from in the output
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// parameters 'reg' and 'index' respectively.
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static uword DecodeLoadWordFromPool(uword end,
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Register* reg,
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intptr_t* index);
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};
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class CallPattern : public ValueObject {
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public:
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CallPattern(uword pc, const Code& code);
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RawICData* IcData();
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RawArray* ClosureArgumentsDescriptor();
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uword TargetAddress() const;
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void SetTargetAddress(uword target_address) const;
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// This constant length is only valid for inserted call patterns used for
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// lazy deoptimization. Regular call pattern may vary in length.
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static int LengthInBytes();
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static void InsertAt(uword pc, uword target_address);
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private:
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const Array& object_pool_;
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uword end_;
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uword args_desc_load_end_;
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uword ic_data_load_end_;
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intptr_t target_address_pool_index_;
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Array& args_desc_;
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ICData& ic_data_;
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DISALLOW_COPY_AND_ASSIGN(CallPattern);
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};
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class JumpPattern : public ValueObject {
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public:
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JumpPattern(uword pc, const Code& code);
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static const int kLengthInBytes = 3 * Instr::kInstrSize;
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static int pattern_length_in_bytes();
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bool IsValid() const;
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uword TargetAddress() const;
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void SetTargetAddress(uword target_address) const;
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private:
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const uword pc_;
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DISALLOW_COPY_AND_ASSIGN(JumpPattern);
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};
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} // namespace dart
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#endif // VM_INSTRUCTIONS_ARM_H_
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