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126 lines
4.8 KiB
C++
126 lines
4.8 KiB
C++
// Copyright 2018, VIXL authors
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice,
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// this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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// * Neither the name of Arm Limited nor the names of its contributors may be
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// used to endorse or promote products derived from this software without
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// specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef VIXL_AARCH64_CPU_FEATURES_AUDITOR_AARCH64_H_
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#define VIXL_AARCH64_CPU_FEATURES_AUDITOR_AARCH64_H_
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#include <iostream>
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#include "../cpu-features.h"
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#include "decoder-aarch64.h"
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namespace vixl {
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namespace aarch64 {
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// This visitor records the CPU features that each decoded instruction requires.
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// It provides:
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// - the set of CPU features required by the most recently decoded instruction,
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// - a cumulative set of encountered CPU features,
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// - an optional list of 'available' CPU features.
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//
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// Primarily, this allows the Disassembler and Simulator to share the same CPU
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// features logic. However, it can be used standalone to scan code blocks for
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// CPU features.
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class CPUFeaturesAuditor : public DecoderVisitor {
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public:
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// Construction arguments:
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// - If a decoder is specified, the CPUFeaturesAuditor automatically
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// registers itself as a visitor. Otherwise, this can be done manually.
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//
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// - If an `available` features list is provided, it is used as a hint in
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// cases where instructions may be provided by multiple separate features.
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// An example of this is FP&SIMD loads and stores: some of these are used
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// in both FP and integer SIMD code. If exactly one of those features is
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// in `available` when one of these instructions is encountered, then the
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// auditor will record that feature. Otherwise, it will record _both_
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// features.
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explicit CPUFeaturesAuditor(
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Decoder* decoder, const CPUFeatures& available = CPUFeatures::None())
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: available_(available), decoder_(decoder) {
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if (decoder_ != NULL) decoder_->AppendVisitor(this);
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}
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explicit CPUFeaturesAuditor(
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const CPUFeatures& available = CPUFeatures::None())
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: available_(available), decoder_(NULL) {}
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virtual ~CPUFeaturesAuditor() {
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if (decoder_ != NULL) decoder_->RemoveVisitor(this);
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}
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void ResetSeenFeatures() {
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seen_ = CPUFeatures::None();
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last_instruction_ = CPUFeatures::None();
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}
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// Query or set available CPUFeatures.
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const CPUFeatures& GetAvailableFeatures() const { return available_; }
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void SetAvailableFeatures(const CPUFeatures& available) {
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available_ = available;
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}
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// Query CPUFeatures seen since construction (or the last call to `Reset()`).
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const CPUFeatures& GetSeenFeatures() const { return seen_; }
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// Query CPUFeatures from the last instruction visited by this auditor.
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const CPUFeatures& GetInstructionFeatures() const {
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return last_instruction_;
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}
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bool InstructionIsAvailable() const {
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return available_.Has(last_instruction_);
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}
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// The common CPUFeatures interface operates on the available_ list.
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CPUFeatures* GetCPUFeatures() { return &available_; }
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void SetCPUFeatures(const CPUFeatures& available) {
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SetAvailableFeatures(available);
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}
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// Declare all Visitor functions.
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#define DECLARE(A) \
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virtual void Visit##A(const Instruction* instr) VIXL_OVERRIDE;
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VISITOR_LIST(DECLARE)
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#undef DECLARE
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private:
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class RecordInstructionFeaturesScope;
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void LoadStoreHelper(const Instruction* instr);
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void LoadStorePairHelper(const Instruction* instr);
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CPUFeatures seen_;
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CPUFeatures last_instruction_;
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CPUFeatures available_;
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Decoder* decoder_;
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};
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} // namespace aarch64
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} // namespace vixl
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#endif // VIXL_AARCH64_CPU_FEATURES_AUDITOR_AARCH64_H_
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