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GP-2957 Sub-flow through INT_DIV and INT_REM

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caheckman 2024-09-20 15:56:02 +00:00
parent 16388dc261
commit 8847d2a6b9
4 changed files with 65 additions and 26 deletions
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20
Ghidra/Features/Decompiler/src/decompile/cpp/varnode.cc
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@ -4,9 +4,9 @@
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*
* http://www.apache.org/licenses/LICENSE-2.0
*
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@ -940,6 +940,22 @@ bool Varnode::isBooleanValue(bool useAnnotation) const
return false;
}
/// If we can prove that the upper bits of \b this are zero, return \b true.
/// \param baseSize is the maximum number of least significant bytes that are allowed to be non-zero
/// \return \b true if all the most significant bytes are zero
bool Varnode::isZeroExtended(int4 baseSize) const
{
if (baseSize >= size) return false;
if (size > sizeof(uintb)) {
if (!isWritten()) return false;
if (def->code() != CPUI_INT_ZEXT) return false;
if (def->getIn(0)->getSize() > baseSize) return false;
return true;
}
uintb mask = nzm >> 8*baseSize;
return (mask == 0);
}
/// Make a local determination if \b this and \b op2 hold the same value. We check if
/// there is a common ancester for which both \b this and \b op2 are created from a direct