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[analyzer] Handle [[assume(cond)]] as __builtin_assume(cond) #101063

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[analyzer] Handle [[assume(cond)]] as __builtin_assume(cond) #101063

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25 changes: 25 additions & 0 deletions clang/lib/StaticAnalyzer/Checkers/BuiltinFunctionChecker.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,11 @@
#include "clang/StaticAnalyzer/Core/PathSensitive/CallEvent.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/CheckerContext.h"
#include "clang/StaticAnalyzer/Core/PathSensitive/DynamicExtent.h"
#include <clang/AST/Stmt.h>
#include <clang/Basic/LLVM.h>
#include <clang/StaticAnalyzer/Core/PathSensitive/SVals.h>
#include <cstdio>
#include <llvm/Support/raw_ostream.h>

using namespace clang;
using namespace ento;
Expand Down Expand Up @@ -77,6 +82,26 @@ bool BuiltinFunctionChecker::evalCall(const CallEvent &Call,
const LocationContext *LCtx = C.getLocationContext();
const Expr *CE = Call.getOriginExpr();

if (const auto *AttrStmt = dyn_cast<AttributedStmt>(CE)) {
for (const Attr *I : AttrStmt->getAttrs()) {
if (const auto *AssumeAttr = dyn_cast<CXXAssumeAttr>(I)) {
const Expr *AssumeExpr = AssumeAttr->getAssumption();
SVal Arg = C.getSVal(AssumeExpr);
if (Arg.isUndef())
return true;

state = state->assume(Arg.castAs<DefinedOrUnknownSVal>(), true);
if (!state) {
C.generateSink(C.getState(), C.getPredecessor());
return true;
}

C.addTransition(state);
return true;
}
}
}

if (isBuiltinLikeFunction(Call)) {
C.addTransition(state->BindExpr(CE, LCtx, Call.getArgSVal(0)));
return true;
Expand Down
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