87a8d40fdd
Any expression that accesses a resource or resource array member of a global struct instance must be during codegen replaced by an access of the corresponding implicit global resource variable. When codegen encounters a `MemberExpr` of a resource type, it traverses the AST to locate the parent struct declaration, building the expected global resource variable name along the way. If the parent declaration is a non-static global struct instance, codegen searches its `HLSLAssociatedResourceDeclAttr` attributes to locate the matching global resource variable and then generates IR code to access the resource global in place of the member access. Fixes #182989 This is the second try to land this. The [first one](https://github.com/llvm/llvm-project/pull/187127)collided with #188792 and both PRs had to be reverted. No updates needed to this change. I synced with @inbelic and we agreed that this one should go in first.
61 lines
1.9 KiB
C++
61 lines
1.9 KiB
C++
//===--- HLSLResource.cpp - Helper routines for HLSL resources -----------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides shared routines to help analyze HLSL resources and
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// their bindings during Sema and CodeGen.
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//
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//===----------------------------------------------------------------------===//
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#include "clang/AST/HLSLResource.h"
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#include "clang/AST/Decl.h"
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#include "clang/AST/DeclCXX.h"
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#include "clang/AST/Type.h"
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using namespace clang;
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namespace clang {
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namespace hlsl {
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void EmbeddedResourceNameBuilder::pushBaseName(llvm::StringRef N) {
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pushName(N, FieldDelim);
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Name.append(BaseClassDelim);
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}
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void EmbeddedResourceNameBuilder::pushName(llvm::StringRef N,
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llvm::StringRef Delim) {
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Offsets.push_back(Name.size());
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if (!Name.empty() && !Name.ends_with(BaseClassDelim))
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Name.append(Delim);
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Name.append(N);
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}
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void EmbeddedResourceNameBuilder::pushArrayIndex(uint64_t Index) {
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llvm::raw_svector_ostream OS(Name);
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Offsets.push_back(Name.size());
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OS << ArrayIndexDelim;
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OS << Index;
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}
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void EmbeddedResourceNameBuilder::pushBaseNameHierarchy(
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CXXRecordDecl *DerivedRD, CXXRecordDecl *BaseRD) {
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assert(BaseRD != DerivedRD && DerivedRD->isDerivedFrom(BaseRD));
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Offsets.push_back(Name.size());
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Name.append(FieldDelim);
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while (BaseRD != DerivedRD) {
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assert(DerivedRD->getNumBases() == 1 &&
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"HLSL does not support multiple inheritance");
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DerivedRD = DerivedRD->bases_begin()->getType()->getAsCXXRecordDecl();
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assert(DerivedRD && "base class not found");
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Name.append(DerivedRD->getName());
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Name.append(BaseClassDelim);
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}
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}
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} // namespace hlsl
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} // namespace clang
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