ad491118df
This pr implements support for a root signature as a target, as specified [here](https://github.com/llvm/wg-hlsl/blob/main/proposals/0029-root-signature-driver-options.md#target-root-signature-version). This is implemented in the following steps: 1. Add `rootsignature` as a shader model environment type and define `rootsig` as a `target_profile`. Only valid as versions 1.0 and 1.1 2. Updates `HLSLFrontendAction` to invoke a special handling of constructing the `ASTContext` if we are considering an `hlsl` file and with a `rootsignature` target 3. Defines the special handling to minimally instantiate the `Parser` and `Sema` to insert the `RootSignatureDecl` 4. Updates `CGHLSLRuntime` to emit the constructed root signature decl as part of `dx.rootsignatures` with a `null` entry function 5. Updates `DXILRootSignature` to handle emitting a root signature without an entry function 6. Updates `ToolChains/HLSL` to invoke `only-section=RTS0` to strip any other generated information Resolves: https://github.com/llvm/llvm-project/issues/150286. ##### Implementation Considerations Ideally we could invoke this as part of `clang-dxc` without the need of a source file. However, the initialization of the `Parser` and `Lexer` becomes quite complicated to handle this. Technically, we could avoid generating any of the extra information that is removed in step 6. However, it seems better to re-use the logic in `llvm-objcopy` without any need for additional custom logic in `DXILRootSignature`.
10 lines
374 B
HLSL
10 lines
374 B
HLSL
// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.3-rootsignature \
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// RUN: -hlsl-entry EntryRS -emit-llvm -o - %s | FileCheck %s
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// CHECK: !dx.rootsignatures = !{![[#ENTRY:]]}
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// CHECK: ![[#ENTRY]] = !{null, ![[#ENTRY_RS:]], i32 2}
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// CHECK: ![[#ENTRY_RS]] = !{![[#ROOT_CBV:]]}
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// CHECK: ![[#ROOT_CBV]] = !{!"RootCBV", i32 0, i32 0, i32 0, i32 4}
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#define EntryRS "CBV(b0)"
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