================
@@ -179,21 +179,45 @@ createBufferHandleType(const HLSLBufferDecl *BufDecl) {
return cast<HLSLAttributedResourceType>(QT.getTypePtr());
}
+// Iterates over all declarations in the HLSL buffer and based on the
+// packoffset or register(c#) annotations it fills outs the Layout
+// vector with the user-specified layout offsets.
+// The buffer offsets can be specified 2 ways:
+// 1. declarations in cbuffer {} block can have a packoffset annotation
+// (translates to HLSLPackOffsetAttr)
+// 2. default constant buffer declarations at global scope can have
+// register(c#) annotations (translates to HLSLResourceBindingAttr with
+// RegisterType::C)
+// It is not quaranteed that all declarations in a buffer have an annotation.
+// For those where it is not specified a -1 value is added to the Layout
+// vector. In the final layout these declarations will be placed at the end
+// of the HLSL buffer after all of the elements with specified offset.
static void fillPackoffsetLayout(const HLSLBufferDecl *BufDecl,
- SmallVector<unsigned> &Layout) {
+ SmallVector<int32_t> &Layout) {
assert(Layout.empty() && "expected empty vector for layout");
assert(BufDecl->hasValidPackoffset());
- for (Decl *D : BufDecl->decls()) {
+ for (Decl *D : BufDecl->buffer_decls()) {
if (isa<CXXRecordDecl, EmptyDecl>(D) || isa<FunctionDecl>(D)) {
continue;
}
VarDecl *VD = dyn_cast<VarDecl>(D);
if (!VD || VD->getType().getAddressSpace() != LangAS::hlsl_constant)
continue;
- assert(VD->hasAttr<HLSLPackOffsetAttr>() &&
- "expected packoffset attribute on every declaration");
- size_t Offset = VD->getAttr<HLSLPackOffsetAttr>()->getOffsetInBytes();
+ size_t Offset = -1;
+ if (VD->hasAttrs()) {
+ for (auto *Attr : VD->getAttrs()) {
+ if (auto *POA = dyn_cast<HLSLPackOffsetAttr>(Attr)) {
+ Offset = POA->getOffsetInBytes();
+ } else if (auto *RBA = dyn_cast<HLSLResourceBindingAttr>(Attr)) {
+ if (RBA->getRegisterType() ==
+ HLSLResourceBindingAttr::RegisterType::C) {
+ // size of constant buffer row is 16 bytes
+ Offset = RBA->getSlotNumber() * 16U;
----------------
damyanp wrote:
Thanks, I think this is probably fine here, but I wonder more generally if
there's any way we can get Sema and CG to agree on constants and things like
that? Does Sema depend on Codegen?
https://github.com/llvm/llvm-project/pull/128991
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