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Diffstat (limited to 'clang/lib/AST/ByteCode/Context.cpp')
-rw-r--r--clang/lib/AST/ByteCode/Context.cpp56
1 files changed, 53 insertions, 3 deletions
diff --git a/clang/lib/AST/ByteCode/Context.cpp b/clang/lib/AST/ByteCode/Context.cpp
index a629ff9..aaeb52e 100644
--- a/clang/lib/AST/ByteCode/Context.cpp
+++ b/clang/lib/AST/ByteCode/Context.cpp
@@ -52,6 +52,19 @@ bool Context::isPotentialConstantExpr(State &Parent, const FunctionDecl *FD) {
return Func->isValid();
}
+void Context::isPotentialConstantExprUnevaluated(State &Parent, const Expr *E,
+ const FunctionDecl *FD) {
+ assert(Stk.empty());
+ ++EvalID;
+ size_t StackSizeBefore = Stk.size();
+ Compiler<EvalEmitter> C(*this, *P, Parent, Stk);
+
+ if (!C.interpretCall(FD, E)) {
+ C.cleanup();
+ Stk.clearTo(StackSizeBefore);
+ }
+}
+
bool Context::evaluateAsRValue(State &Parent, const Expr *E, APValue &Result) {
++EvalID;
bool Recursing = !Stk.empty();
@@ -222,6 +235,43 @@ bool Context::evaluateCharRange(State &Parent, const Expr *SizeExpr,
return evaluateStringRepr(Parent, SizeExpr, PtrExpr, Result);
}
+bool Context::evaluateStrlen(State &Parent, const Expr *E, uint64_t &Result) {
+ assert(Stk.empty());
+ Compiler<EvalEmitter> C(*this, *P, Parent, Stk);
+
+ auto PtrRes = C.interpretAsPointer(E, [&](const Pointer &Ptr) {
+ const Descriptor *FieldDesc = Ptr.getFieldDesc();
+ if (!FieldDesc->isPrimitiveArray())
+ return false;
+
+ unsigned N = Ptr.getNumElems();
+ if (Ptr.elemSize() == 1) {
+ Result = strnlen(reinterpret_cast<const char *>(Ptr.getRawAddress()), N);
+ return Result != N;
+ }
+
+ PrimType ElemT = FieldDesc->getPrimType();
+ Result = 0;
+ for (unsigned I = Ptr.getIndex(); I != N; ++I) {
+ INT_TYPE_SWITCH(ElemT, {
+ auto Elem = Ptr.elem<T>(I);
+ if (Elem.isZero())
+ return true;
+ ++Result;
+ });
+ }
+ // We didn't find a 0 byte.
+ return false;
+ });
+
+ if (PtrRes.isInvalid()) {
+ C.cleanup();
+ Stk.clear();
+ return false;
+ }
+ return true;
+}
+
const LangOptions &Context::getLangOpts() const { return Ctx.getLangOpts(); }
static PrimType integralTypeToPrimTypeS(unsigned BitWidth) {
@@ -256,7 +306,7 @@ static PrimType integralTypeToPrimTypeU(unsigned BitWidth) {
llvm_unreachable("Unhandled BitWidth");
}
-std::optional<PrimType> Context::classify(QualType T) const {
+OptPrimType Context::classify(QualType T) const {
if (const auto *BT = dyn_cast<BuiltinType>(T.getCanonicalType())) {
auto Kind = BT->getKind();
@@ -492,7 +542,7 @@ const Function *Context::getOrCreateFunction(const FunctionDecl *FuncDecl) {
// Assign descriptors to all parameters.
// Composite objects are lowered to pointers.
for (const ParmVarDecl *PD : FuncDecl->parameters()) {
- std::optional<PrimType> T = classify(PD->getType());
+ OptPrimType T = classify(PD->getType());
PrimType PT = T.value_or(PT_Ptr);
Descriptor *Desc = P->createDescriptor(PD, PT);
ParamDescriptors.insert({ParamOffset, {PT, Desc}});
@@ -520,7 +570,7 @@ const Function *Context::getOrCreateObjCBlock(const BlockExpr *E) {
// Assign descriptors to all parameters.
// Composite objects are lowered to pointers.
for (const ParmVarDecl *PD : BD->parameters()) {
- std::optional<PrimType> T = classify(PD->getType());
+ OptPrimType T = classify(PD->getType());
PrimType PT = T.value_or(PT_Ptr);
Descriptor *Desc = P->createDescriptor(PD, PT);
ParamDescriptors.insert({ParamOffset, {PT, Desc}});