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//===--- ParseHLSL.cpp - HLSL-specific parsing support --------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the parsing logic for HLSL language features.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/Attr.h"
#include "clang/Basic/AttributeCommonInfo.h"
#include "clang/Parse/ParseDiagnostic.h"
#include "clang/Parse/Parser.h"
#include "clang/Parse/RAIIObjectsForParser.h"
using namespace clang;
static bool validateDeclsInsideHLSLBuffer(Parser::DeclGroupPtrTy DG,
SourceLocation BufferLoc,
bool IsCBuffer, Parser &P) {
// The parse is failed, just return false.
if (!DG)
return false;
DeclGroupRef Decls = DG.get();
bool IsValid = true;
// Only allow function, variable, record decls inside HLSLBuffer.
for (DeclGroupRef::iterator I = Decls.begin(), E = Decls.end(); I != E; ++I) {
Decl *D = *I;
if (isa<CXXRecordDecl, RecordDecl, FunctionDecl, VarDecl>(D))
continue;
// FIXME: support nested HLSLBuffer and namespace inside HLSLBuffer.
if (isa<HLSLBufferDecl, NamespaceDecl>(D)) {
P.Diag(D->getLocation(), diag::err_invalid_declaration_in_hlsl_buffer)
<< IsCBuffer;
IsValid = false;
continue;
}
IsValid = false;
P.Diag(D->getLocation(), diag::err_invalid_declaration_in_hlsl_buffer)
<< IsCBuffer;
}
return IsValid;
}
Decl *Parser::ParseHLSLBuffer(SourceLocation &DeclEnd) {
assert((Tok.is(tok::kw_cbuffer) || Tok.is(tok::kw_tbuffer)) &&
"Not a cbuffer or tbuffer!");
bool IsCBuffer = Tok.is(tok::kw_cbuffer);
SourceLocation BufferLoc = ConsumeToken(); // Eat the 'cbuffer' or 'tbuffer'.
if (!Tok.is(tok::identifier)) {
Diag(Tok, diag::err_expected) << tok::identifier;
return nullptr;
}
IdentifierInfo *Identifier = Tok.getIdentifierInfo();
SourceLocation IdentifierLoc = ConsumeToken();
ParsedAttributes Attrs(AttrFactory);
MaybeParseHLSLSemantics(Attrs, nullptr);
ParseScope BufferScope(this, Scope::DeclScope);
BalancedDelimiterTracker T(*this, tok::l_brace);
if (T.consumeOpen()) {
Diag(Tok, diag::err_expected) << tok::l_brace;
return nullptr;
}
Decl *D = Actions.ActOnStartHLSLBuffer(getCurScope(), IsCBuffer, BufferLoc,
Identifier, IdentifierLoc,
T.getOpenLocation());
while (Tok.isNot(tok::r_brace) && Tok.isNot(tok::eof)) {
// FIXME: support attribute on constants inside cbuffer/tbuffer.
ParsedAttributes DeclAttrs(AttrFactory);
ParsedAttributes EmptyDeclSpecAttrs(AttrFactory);
DeclGroupPtrTy Result =
ParseExternalDeclaration(DeclAttrs, EmptyDeclSpecAttrs);
if (!validateDeclsInsideHLSLBuffer(Result, IdentifierLoc, IsCBuffer,
*this)) {
T.skipToEnd();
DeclEnd = T.getCloseLocation();
BufferScope.Exit();
Actions.ActOnFinishHLSLBuffer(D, DeclEnd);
return nullptr;
}
}
T.consumeClose();
DeclEnd = T.getCloseLocation();
BufferScope.Exit();
Actions.ActOnFinishHLSLBuffer(D, DeclEnd);
Actions.ProcessDeclAttributeList(Actions.CurScope, D, Attrs);
return D;
}
static void fixSeparateAttrArgAndNumber(StringRef ArgStr, SourceLocation ArgLoc,
Token Tok, ArgsVector &ArgExprs,
Parser &P, ASTContext &Ctx,
Preprocessor &PP) {
StringRef Num = StringRef(Tok.getLiteralData(), Tok.getLength());
SourceLocation EndNumLoc = Tok.getEndLoc();
P.ConsumeToken(); // consume constant.
std::string FixedArg = ArgStr.str() + Num.str();
P.Diag(ArgLoc, diag::err_hlsl_separate_attr_arg_and_number)
<< FixedArg
<< FixItHint::CreateReplacement(SourceRange(ArgLoc, EndNumLoc), FixedArg);
ArgsUnion &Slot = ArgExprs.back();
Slot = IdentifierLoc::create(Ctx, ArgLoc, PP.getIdentifierInfo(FixedArg));
}
void Parser::ParseHLSLSemantics(ParsedAttributes &Attrs,
SourceLocation *EndLoc) {
// FIXME: HLSLSemantic is shared for Semantic and resource binding which is
// confusing. Need a better name to avoid misunderstanding. Issue
// https://github.com/llvm/llvm-project/issues/57882
assert(Tok.is(tok::colon) && "Not a HLSL Semantic");
ConsumeToken();
IdentifierInfo *II = nullptr;
if (Tok.is(tok::kw_register))
II = PP.getIdentifierInfo("register");
else if (Tok.is(tok::identifier))
II = Tok.getIdentifierInfo();
if (!II) {
Diag(Tok.getLocation(), diag::err_expected_semantic_identifier);
return;
}
SourceLocation Loc = ConsumeToken();
if (EndLoc)
*EndLoc = Tok.getLocation();
ParsedAttr::Kind AttrKind =
ParsedAttr::getParsedKind(II, nullptr, ParsedAttr::AS_HLSLSemantic);
ArgsVector ArgExprs;
switch (AttrKind) {
case ParsedAttr::AT_HLSLResourceBinding: {
if (ExpectAndConsume(tok::l_paren, diag::err_expected_lparen_after)) {
SkipUntil(tok::r_paren, StopAtSemi); // skip through )
return;
}
if (!Tok.is(tok::identifier)) {
Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
SkipUntil(tok::r_paren, StopAtSemi); // skip through )
return;
}
StringRef SlotStr = Tok.getIdentifierInfo()->getName();
SourceLocation SlotLoc = Tok.getLocation();
ArgExprs.push_back(ParseIdentifierLoc());
// Add numeric_constant for fix-it.
if (SlotStr.size() == 1 && Tok.is(tok::numeric_constant))
fixSeparateAttrArgAndNumber(SlotStr, SlotLoc, Tok, ArgExprs, *this,
Actions.Context, PP);
if (Tok.is(tok::comma)) {
ConsumeToken(); // consume comma
if (!Tok.is(tok::identifier)) {
Diag(Tok.getLocation(), diag::err_expected) << tok::identifier;
SkipUntil(tok::r_paren, StopAtSemi); // skip through )
return;
}
StringRef SpaceStr = Tok.getIdentifierInfo()->getName();
SourceLocation SpaceLoc = Tok.getLocation();
ArgExprs.push_back(ParseIdentifierLoc());
// Add numeric_constant for fix-it.
if (SpaceStr.equals("space") && Tok.is(tok::numeric_constant))
fixSeparateAttrArgAndNumber(SpaceStr, SpaceLoc, Tok, ArgExprs, *this,
Actions.Context, PP);
}
if (ExpectAndConsume(tok::r_paren, diag::err_expected)) {
SkipUntil(tok::r_paren, StopAtSemi); // skip through )
return;
}
} break;
case ParsedAttr::UnknownAttribute:
Diag(Loc, diag::err_unknown_hlsl_semantic) << II;
return;
case ParsedAttr::AT_HLSLSV_GroupIndex:
case ParsedAttr::AT_HLSLSV_DispatchThreadID:
break;
default:
llvm_unreachable("invalid HLSL Semantic");
break;
}
Attrs.addNew(II, Loc, nullptr, SourceLocation(), ArgExprs.data(),
ArgExprs.size(), ParsedAttr::AS_HLSLSemantic);
}
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