65 lines
2.5 KiB
Plaintext
65 lines
2.5 KiB
Plaintext
// BSD 3-Clause License
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//
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// Copyright (c) 2020, The Ohio State Univerisity. 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, this
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// list of conditions and the following disclaimer.
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//
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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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//
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// * Neither the name of the copyright holder nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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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// Note: Timestamp Dependence, similar for the other dependeces, such as block state
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#include "types.dl"
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#include "opcode.dl"
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// Filter and obtain the pairs (x, y) with the dependency relationship
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.decl depends(x:Variable, y:Variable)
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depends(x, x) :-
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use(x, _, _, _, _, _).
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depends(x, x) :-
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def(x, _, _, _, _).
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depends(x, y) :-
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def(x, stmt, _, x_cd, x_cn),
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use(y, stmt, _, _, x_cd, x_cn).
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depends(x, z) :-
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depends(x, y),
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depends(y, z).
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.decl TimestampDependenceResult(bsd_loc:number, bsd_val:Value, jumpi_loc:number)
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.output TimestampDependenceResult
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TimestampDependenceResult(bsd_loc, bsd_val, jumpi_loc):-
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// Step1: Obtain all the timestamp opcodes
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op_TIMESTAMP(_, bsd_var, bsd_loc, 1, _),
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// Step2: This opcode should determine a path
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op_JUMPI(_, _, jumpi_cond_var, jumpi_loc, _, _),
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jumpi_loc > bsd_loc,
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depends(jumpi_cond_var, bsd_var),
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value(bsd_var, bsd_val).
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