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31 lines
1.3 KiB
Plaintext
31 lines
1.3 KiB
Plaintext
import default
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import semmle.code.cpp.ssa.SSAIR
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import semmle.code.cpp.ssa.internal.IntegerConstant
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language[monotonicAggregates]
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IntValue getConstantValue(Instruction instr) {
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result = instr.(IntegerConstantInstruction).getValue().toInt() or
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exists(BinaryInstruction binInstr, IntValue left, IntValue right |
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binInstr = instr and
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left = getConstantValue(binInstr.getLeftOperand()) and
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right = getConstantValue(binInstr.getRightOperand()) and
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(
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binInstr instanceof AddInstruction and result = add(left, right) or
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binInstr instanceof SubInstruction and result = sub(left, right) or
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binInstr instanceof MulInstruction and result = mul(left, right) or
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binInstr instanceof DivInstruction and result = div(left, right)
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)
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) or
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result = getConstantValue(instr.(CopyInstruction).getSourceValue()) or
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exists(PhiInstruction phi |
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phi = instr and
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result = max(Instruction operand | operand = phi.getAnOperand() | getConstantValue(operand)) and
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result = min(Instruction operand | operand = phi.getAnOperand() | getConstantValue(operand))
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)
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}
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from FunctionIR funcIR, int value
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where
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value = getValue(getConstantValue(funcIR.getReturnInstruction().(ReturnValueInstruction).getReturnValue()))
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select funcIR, value
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