================
@@ -121,29 +359,159 @@ mlir::Value CIRGenFunction::emitScalarExpr(const Expr
*e) {
return ScalarExprEmitter(*this, builder).Visit(const_cast<Expr *>(e));
}
+[[maybe_unused]] static bool MustVisitNullValue(const Expr *e) {
+ // If a null pointer expression's type is the C++0x nullptr_t, then
+ // it's not necessarily a simple constant and it must be evaluated
+ // for its potential side effects.
+ return e->getType()->isNullPtrType();
+}
+
// Emit code for an explicit or implicit cast. Implicit
// casts have to handle a more broad range of conversions than explicit
// casts, as they handle things like function to ptr-to-function decay
// etc.
mlir::Value ScalarExprEmitter::VisitCastExpr(CastExpr *ce) {
- Expr *e = ce->getSubExpr();
+ Expr *subExpr = ce->getSubExpr();
QualType destTy = ce->getType();
CastKind kind = ce->getCastKind();
+ // These cases are generally not written to ignore the result of evaluating
+ // their sub-expressions, so we clear this now.
+ ignoreResultAssign = false;
+
switch (kind) {
+ case clang::CK_Dependent:
+ llvm_unreachable("dependent cast kind in CIR gen!");
+ case clang::CK_BuiltinFnToFnPtr:
+ llvm_unreachable("builtin functions are handled elsewhere");
+
+ case CK_CPointerToObjCPointerCast:
+ case CK_BlockPointerToObjCPointerCast:
+ case CK_AnyPointerToBlockPointerCast:
+ case CK_BitCast: {
+ mlir::Value src = Visit(const_cast<Expr *>(subExpr));
+ mlir::Type dstTy = cgf.convertType(destTy);
+
+ assert(!cir::MissingFeatures::addressSpace());
+
+ if (cgf.sanOpts.has(SanitizerKind::CFIUnrelatedCast))
+ cgf.getCIRGenModule().errorNYI(subExpr->getSourceRange(),
+ "sanitizer support");
+
+ if (cgf.cgm.getCodeGenOpts().StrictVTablePointers)
+ cgf.getCIRGenModule().errorNYI(subExpr->getSourceRange(),
+ "strict vtable pointers");
+
+ // Update heapallocsite metadata when there is an explicit pointer cast.
+ assert(!cir::MissingFeatures::addHeapAllocSiteMetadata());
+
+ // If Src is a fixed vector and Dst is a scalable vector, and both have the
+ // same element type, use the llvm.vector.insert intrinsic to perform the
+ // bitcast.
+ assert(!cir::MissingFeatures::scalableVectors());
+
+ // If Src is a scalable vector and Dst is a fixed vector, and both have the
+ // same element type, use the llvm.vector.extract intrinsic to perform the
+ // bitcast.
+ assert(!cir::MissingFeatures::scalableVectors());
+
+ // Perform VLAT <-> VLST bitcast through memory.
+ // TODO: since the llvm.experimental.vector.{insert,extract} intrinsics
+ // require the element types of the vectors to be the same, we
+ // need to keep this around for bitcasts between VLAT <-> VLST where
+ // the element types of the vectors are not the same, until we figure
+ // out a better way of doing these casts.
+ assert(!cir::MissingFeatures::scalableVectors());
+
+ return
cgf.getBuilder().createBitcast(cgf.getLoc(subExpr->getSourceRange()),
+ src, dstTy);
+ }
+
+ case CK_AtomicToNonAtomic:
+ cgf.getCIRGenModule().errorNYI(subExpr->getSourceRange(),
+ "CastExpr: ", ce->getCastKindName());
+ break;
----------------
erichkeane wrote:
still, atomic-to-non-atomic cast can change types, so probably should return
something.
https://github.com/llvm/llvm-project/pull/130690
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