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GP-3019 Detect flow of NaN into floating-point comparison

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This commit is contained in:
caheckman 2023-07-21 18:26:22 +00:00
parent 285c90f1c5
commit f61367bf19
13 changed files with 320 additions and 13 deletions
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35
Ghidra/Features/Decompiler/src/decompile/cpp/options.cc
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@ -59,6 +59,7 @@ ElementId ELEM_STRUCTALIGN = ElementId("structalign",208);
ElementId ELEM_TOGGLERULE = ElementId("togglerule",209);
ElementId ELEM_WARNING = ElementId("warning",210);
ElementId ELEM_JUMPTABLEMAX = ElementId("jumptablemax",271);
ElementId ELEM_NANIGNORE = ElementId("nanignore",272);
/// If the parameter is "on" return \b true, if "off" return \b false.
/// Any other value causes an exception.
@ -128,6 +129,7 @@ OptionDatabase::OptionDatabase(Architecture *g)
registerOption(new OptionMaxInstruction());
registerOption(new OptionNamespaceStrategy());
registerOption(new OptionSplitDatatypes());
registerOption(new OptionNanIgnore());
}
OptionDatabase::~OptionDatabase(void)
@ -985,4 +987,37 @@ string OptionSplitDatatypes::apply(Architecture *glb,const string &p1,const stri
return "Split data-type configuration set";
}
string OptionNanIgnore::apply(Architecture *glb,const string &p1,const string &p2,const string &p3) const
{
bool oldIgnoreAll = glb->nan_ignore_all;
bool oldIgnoreCompare = glb->nan_ignore_compare;
if (p1 == "none") { // Don't ignore any NaN operation
glb->nan_ignore_all = false;
glb->nan_ignore_compare = false;
}
else if (p1 == "compare") { // Ignore only NaN operations protecting floating-point comparisons
glb->nan_ignore_all = false;
glb->nan_ignore_compare = true;
}
else if (p1 == "all") { // Ignore all NaN operations
glb->nan_ignore_all = true;
glb->nan_ignore_compare = true;
}
else {
throw LowlevelError("Unknown nanignore option: "+p1);
}
Action *root = glb->allacts.getCurrent();
if (!glb->nan_ignore_all && !glb->nan_ignore_compare) {
root->disableRule("ignorenan");
}
else {
root->enableRule("ignorenan");
}
if (oldIgnoreAll == glb->nan_ignore_all && oldIgnoreCompare == glb->nan_ignore_compare)
return "NaN ignore configuration unchanged";
return "Nan ignore configuration set to: " + p1;
}
} // End namespace ghidra