[llvm-branch-commits] [clang] [llvm] [HLSL][RootSignature] Add parsing of Register in params for RootParams (PR #140148)
Finn Plummer via llvm-branch-commits
llvm-branch-commits at lists.llvm.org
Wed May 21 12:02:57 PDT 2025
https://github.com/inbelic updated https://github.com/llvm/llvm-project/pull/140148
>From 994bc35f7eb1707097511a121d2a5a0b6f42637c Mon Sep 17 00:00:00 2001
From: Finn Plummer <canadienfinn at gmail.com>
Date: Thu, 15 May 2025 19:49:44 +0000
Subject: [PATCH 1/2] [HLSL][RootSignature] Add parsing of Register in params
for RootParams
- defines the `parseRootParamParams` infastructure for parsing the
params of a RootParam
- defines the register type to illustrate use
- add tests to demonstrate functionality
---
.../clang/Parse/ParseHLSLRootSignature.h | 6 +++
clang/lib/Parse/ParseHLSLRootSignature.cpp | 42 +++++++++++++++++++
.../Parse/ParseHLSLRootSignatureTest.cpp | 13 ++++--
.../llvm/Frontend/HLSL/HLSLRootSignature.h | 1 +
4 files changed, 58 insertions(+), 4 deletions(-)
diff --git a/clang/include/clang/Parse/ParseHLSLRootSignature.h b/clang/include/clang/Parse/ParseHLSLRootSignature.h
index b96416ab6c6c4..92b8e7389426a 100644
--- a/clang/include/clang/Parse/ParseHLSLRootSignature.h
+++ b/clang/include/clang/Parse/ParseHLSLRootSignature.h
@@ -89,6 +89,12 @@ class RootSignatureParser {
};
std::optional<ParsedConstantParams> parseRootConstantParams();
+ struct ParsedRootParamParams {
+ std::optional<llvm::hlsl::rootsig::Register> Reg;
+ };
+ std::optional<ParsedRootParamParams>
+ parseRootParamParams(RootSignatureToken::Kind RegType);
+
struct ParsedClauseParams {
std::optional<llvm::hlsl::rootsig::Register> Reg;
std::optional<uint32_t> NumDescriptors;
diff --git a/clang/lib/Parse/ParseHLSLRootSignature.cpp b/clang/lib/Parse/ParseHLSLRootSignature.cpp
index 3ed60442eaa14..de7c2452b3fd4 100644
--- a/clang/lib/Parse/ParseHLSLRootSignature.cpp
+++ b/clang/lib/Parse/ParseHLSLRootSignature.cpp
@@ -176,20 +176,37 @@ std::optional<RootParam> RootSignatureParser::parseRootParam() {
return std::nullopt;
RootParam Param;
+ TokenKind ExpectedReg;
switch (ParamKind) {
default:
llvm_unreachable("Switch for consumed token was not provided");
case TokenKind::kw_CBV:
Param.Type = ParamType::CBuffer;
+ ExpectedReg = TokenKind::bReg;
break;
case TokenKind::kw_SRV:
Param.Type = ParamType::SRV;
+ ExpectedReg = TokenKind::tReg;
break;
case TokenKind::kw_UAV:
Param.Type = ParamType::UAV;
+ ExpectedReg = TokenKind::uReg;
break;
}
+ auto Params = parseRootParamParams(ExpectedReg);
+ if (!Params.has_value())
+ return std::nullopt;
+
+ // Check mandatory parameters were provided
+ if (!Params->Reg.has_value()) {
+ getDiags().Report(CurToken.TokLoc, diag::err_hlsl_rootsig_missing_param)
+ << ExpectedReg;
+ return std::nullopt;
+ }
+
+ Param.Reg = Params->Reg.value();
+
if (consumeExpectedToken(TokenKind::pu_r_paren,
diag::err_hlsl_unexpected_end_of_params,
/*param of=*/TokenKind::kw_RootConstants))
@@ -398,6 +415,31 @@ RootSignatureParser::parseRootConstantParams() {
return Params;
}
+std::optional<RootSignatureParser::ParsedRootParamParams>
+RootSignatureParser::parseRootParamParams(TokenKind RegType) {
+ assert(CurToken.TokKind == TokenKind::pu_l_paren &&
+ "Expects to only be invoked starting at given token");
+
+ ParsedRootParamParams Params;
+ do {
+ // ( `b` | `t` | `u`) POS_INT
+ if (tryConsumeExpectedToken(RegType)) {
+ if (Params.Reg.has_value()) {
+ getDiags().Report(CurToken.TokLoc, diag::err_hlsl_rootsig_repeat_param)
+ << CurToken.TokKind;
+ return std::nullopt;
+ }
+ auto Reg = parseRegister();
+ if (!Reg.has_value())
+ return std::nullopt;
+ Params.Reg = Reg;
+ }
+
+ } while (tryConsumeExpectedToken(TokenKind::pu_comma));
+
+ return Params;
+}
+
std::optional<RootSignatureParser::ParsedClauseParams>
RootSignatureParser::parseDescriptorTableClauseParams(TokenKind RegType) {
assert(CurToken.TokKind == TokenKind::pu_l_paren &&
diff --git a/clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp b/clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp
index 876dcd17f0389..0f32523493a53 100644
--- a/clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp
+++ b/clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp
@@ -346,9 +346,9 @@ TEST_F(ParseHLSLRootSignatureTest, ValidParseRootFlagsTest) {
TEST_F(ParseHLSLRootSignatureTest, ValidParseRootParamsTest) {
const llvm::StringLiteral Source = R"cc(
- CBV(),
- SRV(),
- UAV()
+ CBV(b0),
+ SRV(t42),
+ UAV(u34893247)
)cc";
TrivialModuleLoader ModLoader;
@@ -368,15 +368,20 @@ TEST_F(ParseHLSLRootSignatureTest, ValidParseRootParamsTest) {
RootElement Elem = Elements[0];
ASSERT_TRUE(std::holds_alternative<RootParam>(Elem));
- ASSERT_EQ(std::get<RootParam>(Elem).Type, ParamType::CBuffer);
+ ASSERT_EQ(std::get<RootParam>(Elem).Reg.ViewType, RegisterType::BReg);
+ ASSERT_EQ(std::get<RootParam>(Elem).Reg.Number, 0u);
Elem = Elements[1];
ASSERT_TRUE(std::holds_alternative<RootParam>(Elem));
ASSERT_EQ(std::get<RootParam>(Elem).Type, ParamType::SRV);
+ ASSERT_EQ(std::get<RootParam>(Elem).Reg.ViewType, RegisterType::TReg);
+ ASSERT_EQ(std::get<RootParam>(Elem).Reg.Number, 42u);
Elem = Elements[2];
ASSERT_TRUE(std::holds_alternative<RootParam>(Elem));
ASSERT_EQ(std::get<RootParam>(Elem).Type, ParamType::UAV);
+ ASSERT_EQ(std::get<RootParam>(Elem).Reg.ViewType, RegisterType::UReg);
+ ASSERT_EQ(std::get<RootParam>(Elem).Reg.Number, 34893247u);
ASSERT_TRUE(Consumer->isSatisfied());
}
diff --git a/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h b/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
index 2bcae22c6cfb2..5b2bb59fe9c02 100644
--- a/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
+++ b/llvm/include/llvm/Frontend/HLSL/HLSLRootSignature.h
@@ -88,6 +88,7 @@ struct RootConstants {
using ParamType = llvm::dxil::ResourceClass;
struct RootParam {
ParamType Type;
+ Register Reg;
};
// Models the end of a descriptor table and stores its visibility
>From 7b81667999285af602ac97514f805f4f726b321c Mon Sep 17 00:00:00 2001
From: Finn Plummer <canadienfinn at gmail.com>
Date: Wed, 21 May 2025 19:02:30 +0000
Subject: [PATCH 2/2] review: rename RootParam to RootDescriptor
---
clang/include/clang/Parse/ParseHLSLRootSignature.h | 6 +++---
clang/lib/Parse/ParseHLSLRootSignature.cpp | 8 ++++----
.../unittests/Parse/ParseHLSLRootSignatureTest.cpp | 13 +++++++------
3 files changed, 14 insertions(+), 13 deletions(-)
diff --git a/clang/include/clang/Parse/ParseHLSLRootSignature.h b/clang/include/clang/Parse/ParseHLSLRootSignature.h
index 92b8e7389426a..7f05b2c6f1c9a 100644
--- a/clang/include/clang/Parse/ParseHLSLRootSignature.h
+++ b/clang/include/clang/Parse/ParseHLSLRootSignature.h
@@ -89,11 +89,11 @@ class RootSignatureParser {
};
std::optional<ParsedConstantParams> parseRootConstantParams();
- struct ParsedRootParamParams {
+ struct ParsedRootDescriptorParams {
std::optional<llvm::hlsl::rootsig::Register> Reg;
};
- std::optional<ParsedRootParamParams>
- parseRootParamParams(RootSignatureToken::Kind RegType);
+ std::optional<ParsedRootDescriptorParams>
+ parseRootDescriptorParams(RootSignatureToken::Kind RegType);
struct ParsedClauseParams {
std::optional<llvm::hlsl::rootsig::Register> Reg;
diff --git a/clang/lib/Parse/ParseHLSLRootSignature.cpp b/clang/lib/Parse/ParseHLSLRootSignature.cpp
index de7c2452b3fd4..13d6b4a8cf18f 100644
--- a/clang/lib/Parse/ParseHLSLRootSignature.cpp
+++ b/clang/lib/Parse/ParseHLSLRootSignature.cpp
@@ -194,7 +194,7 @@ std::optional<RootParam> RootSignatureParser::parseRootParam() {
break;
}
- auto Params = parseRootParamParams(ExpectedReg);
+ auto Params = parseRootDescriptorParams(ExpectedReg);
if (!Params.has_value())
return std::nullopt;
@@ -415,12 +415,12 @@ RootSignatureParser::parseRootConstantParams() {
return Params;
}
-std::optional<RootSignatureParser::ParsedRootParamParams>
-RootSignatureParser::parseRootParamParams(TokenKind RegType) {
+std::optional<RootSignatureParser::ParsedRootDescriptorParams>
+RootSignatureParser::parseRootDescriptorParams(TokenKind RegType) {
assert(CurToken.TokKind == TokenKind::pu_l_paren &&
"Expects to only be invoked starting at given token");
- ParsedRootParamParams Params;
+ ParsedRootDescriptorParams Params;
do {
// ( `b` | `t` | `u`) POS_INT
if (tryConsumeExpectedToken(RegType)) {
diff --git a/clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp b/clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp
index 0f32523493a53..56dd0fdc2769d 100644
--- a/clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp
+++ b/clang/unittests/Parse/ParseHLSLRootSignatureTest.cpp
@@ -368,20 +368,21 @@ TEST_F(ParseHLSLRootSignatureTest, ValidParseRootParamsTest) {
RootElement Elem = Elements[0];
ASSERT_TRUE(std::holds_alternative<RootParam>(Elem));
- ASSERT_EQ(std::get<RootParam>(Elem).Reg.ViewType, RegisterType::BReg);
- ASSERT_EQ(std::get<RootParam>(Elem).Reg.Number, 0u);
+ ASSERT_EQ(std::get<RootParam>(Elem).Type, ParamType::CBuffer);
+ ASSERT_EQ(std::get<RootDescriptor>(Elem).Reg.ViewType, RegisterType::BReg);
+ ASSERT_EQ(std::get<RootDescriptor>(Elem).Reg.Number, 0u);
Elem = Elements[1];
ASSERT_TRUE(std::holds_alternative<RootParam>(Elem));
ASSERT_EQ(std::get<RootParam>(Elem).Type, ParamType::SRV);
- ASSERT_EQ(std::get<RootParam>(Elem).Reg.ViewType, RegisterType::TReg);
- ASSERT_EQ(std::get<RootParam>(Elem).Reg.Number, 42u);
+ ASSERT_EQ(std::get<RootDescriptor>(Elem).Reg.ViewType, RegisterType::TReg);
+ ASSERT_EQ(std::get<RootDescriptor>(Elem).Reg.Number, 42u);
Elem = Elements[2];
ASSERT_TRUE(std::holds_alternative<RootParam>(Elem));
ASSERT_EQ(std::get<RootParam>(Elem).Type, ParamType::UAV);
- ASSERT_EQ(std::get<RootParam>(Elem).Reg.ViewType, RegisterType::UReg);
- ASSERT_EQ(std::get<RootParam>(Elem).Reg.Number, 34893247u);
+ ASSERT_EQ(std::get<RootDescriptor>(Elem).Reg.ViewType, RegisterType::UReg);
+ ASSERT_EQ(std::get<RootDescriptor>(Elem).Reg.Number, 34893247u);
ASSERT_TRUE(Consumer->isSatisfied());
}
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