[llvm] [DirectX] Add `extract-section` to `llvm-objcopy` and implement it for `DXContainer` (PR #154804)

via llvm-commits llvm-commits at lists.llvm.org
Thu Aug 21 10:50:58 PDT 2025


llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-binary-utilities

Author: Finn Plummer (inbelic)

<details>
<summary>Changes</summary>

This pr adds the `extract-section` option to `llvm-objcopy` as a common option. It differs from `dump-section` as it will produce a standalone object with just one section, as opposed to just the section contents.

This difference in behaviour is used for DXC compatibility with `extract-rootsignature` and `/Frs`.

This pr then implements this functionality for `DXContainer` objects.

This is the second step of https://github.com/llvm/llvm-project/issues/150277 to implement as a compiler action that invokes `llvm-objcopy` for functionality.

This also completes the implementation of `extract-rootsignature` as described in https://github.com/llvm/llvm-project/issues/149560.

---

Patch is 27.58 KiB, truncated to 20.00 KiB below, full version: https://github.com/llvm/llvm-project/pull/154804.diff


8 Files Affected:

- (modified) llvm/include/llvm/ObjCopy/CommonConfig.h (+1) 
- (modified) llvm/lib/ObjCopy/ConfigManager.cpp (+6-7) 
- (modified) llvm/lib/ObjCopy/DXContainer/DXContainerObjcopy.cpp (+33) 
- (added) llvm/test/tools/llvm-objcopy/DXContainer/extract-basic.test (+306) 
- (added) llvm/test/tools/llvm-objcopy/DXContainer/extract-errs.test (+21) 
- (added) llvm/test/tools/llvm-objcopy/DXContainer/extract-headers.test (+56) 
- (modified) llvm/tools/llvm-objcopy/CommonOpts.td (+5) 
- (modified) llvm/tools/llvm-objcopy/ObjcopyOptions.cpp (+8) 


``````````diff
diff --git a/llvm/include/llvm/ObjCopy/CommonConfig.h b/llvm/include/llvm/ObjCopy/CommonConfig.h
index faa7b0db757a3..bad4bfdeaa46e 100644
--- a/llvm/include/llvm/ObjCopy/CommonConfig.h
+++ b/llvm/include/llvm/ObjCopy/CommonConfig.h
@@ -233,6 +233,7 @@ struct CommonConfig {
   SmallVector<StringRef, 0> DumpSection;
   SmallVector<NewSectionInfo, 0> UpdateSection;
   SmallVector<SectionPatternAddressUpdate, 0> ChangeSectionAddress;
+  SmallVector<StringRef, 0> ExtractSection;
 
   // Section matchers
   NameMatcher KeepSection;
diff --git a/llvm/lib/ObjCopy/ConfigManager.cpp b/llvm/lib/ObjCopy/ConfigManager.cpp
index 2b17d728aad3f..bd9af30e3e003 100644
--- a/llvm/lib/ObjCopy/ConfigManager.cpp
+++ b/llvm/lib/ObjCopy/ConfigManager.cpp
@@ -27,7 +27,7 @@ Expected<const COFFConfig &> ConfigManager::getCOFFConfig() const {
       Common.DiscardMode == DiscardType::Locals ||
       !Common.SymbolsToAdd.empty() || Common.GapFill != 0 ||
       Common.PadTo != 0 || Common.ChangeSectionLMAValAll != 0 ||
-      !Common.ChangeSectionAddress.empty())
+      !Common.ChangeSectionAddress.empty() || !Common.ExtractSection.empty())
     return createStringError(llvm::errc::invalid_argument,
                              "option is not supported for COFF");
 
@@ -48,7 +48,7 @@ Expected<const MachOConfig &> ConfigManager::getMachOConfig() const {
       Common.DiscardMode == DiscardType::Locals ||
       !Common.SymbolsToAdd.empty() || Common.GapFill != 0 ||
       Common.PadTo != 0 || Common.ChangeSectionLMAValAll != 0 ||
-      !Common.ChangeSectionAddress.empty())
+      !Common.ChangeSectionAddress.empty() || !Common.ExtractSection.empty())
     return createStringError(llvm::errc::invalid_argument,
                              "option is not supported for MachO");
 
@@ -69,7 +69,7 @@ Expected<const WasmConfig &> ConfigManager::getWasmConfig() const {
       !Common.SetSectionFlags.empty() || !Common.SetSectionType.empty() ||
       !Common.SymbolsToRename.empty() || Common.GapFill != 0 ||
       Common.PadTo != 0 || Common.ChangeSectionLMAValAll != 0 ||
-      !Common.ChangeSectionAddress.empty())
+      !Common.ChangeSectionAddress.empty() || !Common.ExtractSection.empty())
     return createStringError(llvm::errc::invalid_argument,
                              "only flags for section dumping, removal, and "
                              "addition are supported");
@@ -99,7 +99,7 @@ Expected<const XCOFFConfig &> ConfigManager::getXCOFFConfig() const {
       Common.Weaken || Common.StripUnneeded || Common.DecompressDebugSections ||
       Common.GapFill != 0 || Common.PadTo != 0 ||
       Common.ChangeSectionLMAValAll != 0 ||
-      !Common.ChangeSectionAddress.empty()) {
+      !Common.ChangeSectionAddress.empty() || !Common.ExtractSection.empty()) {
     return createStringError(
         llvm::errc::invalid_argument,
         "no flags are supported yet, only basic copying is allowed");
@@ -125,9 +125,8 @@ ConfigManager::getDXContainerConfig() const {
       Common.GapFill != 0 || Common.PadTo != 0 ||
       Common.ChangeSectionLMAValAll != 0 ||
       !Common.ChangeSectionAddress.empty()) {
-    return createStringError(
-        llvm::errc::invalid_argument,
-        "no flags are supported yet, only basic copying is allowed");
+    return createStringError(llvm::errc::invalid_argument,
+                             "option is not supported for DXContainer");
   }
   return DXContainer;
 }
diff --git a/llvm/lib/ObjCopy/DXContainer/DXContainerObjcopy.cpp b/llvm/lib/ObjCopy/DXContainer/DXContainerObjcopy.cpp
index 375e382ddb044..66ebe0016965e 100644
--- a/llvm/lib/ObjCopy/DXContainer/DXContainerObjcopy.cpp
+++ b/llvm/lib/ObjCopy/DXContainer/DXContainerObjcopy.cpp
@@ -11,6 +11,7 @@
 #include "DXContainerWriter.h"
 #include "llvm/ObjCopy/CommonConfig.h"
 #include "llvm/ObjCopy/DXContainer/DXContainerConfig.h"
+#include "llvm/Support/raw_ostream.h"
 
 namespace llvm {
 namespace objcopy {
@@ -18,6 +19,29 @@ namespace dxbc {
 
 using namespace object;
 
+static Error extractPartAsObject(StringRef PartName, StringRef OutFilename,
+                               StringRef InputFilename, const Object &Obj) {
+  for (const Part &P : Obj.Parts)
+    if (P.Name == PartName) {
+      Object PartObj;
+      PartObj.Header = Obj.Header;
+      PartObj.Parts.push_back({P.Name, P.Data});
+      PartObj.recomputeHeader();
+
+      auto Write = [&OutFilename, &PartObj](raw_ostream &Out) -> Error {
+        DXContainerWriter Writer(PartObj, Out);
+        if (Error E = Writer.write())
+          return createFileError(OutFilename, std::move(E));
+        return Error::success();
+      };
+
+      return writeToOutput(OutFilename, Write);
+    }
+
+  return createFileError(InputFilename, object_error::parse_failed,
+                         "part '%s' not found", PartName.str().c_str());
+}
+
 static Error handleArgs(const CommonConfig &Config, Object &Obj) {
   std::function<bool(const Part &)> RemovePred = [](const Part &) {
     return false;
@@ -28,6 +52,15 @@ static Error handleArgs(const CommonConfig &Config, Object &Obj) {
       return Config.ToRemove.matches(P.Name);
     };
 
+  for (StringRef Flag : Config.ExtractSection) {
+    StringRef SectionName;
+    StringRef FileName;
+    std::tie(SectionName, FileName) = Flag.split('=');
+    if (Error E =
+            extractPartAsObject(SectionName, FileName, Config.InputFilename, Obj))
+      return E;
+  }
+
   if (auto E = Obj.removeParts(RemovePred))
     return E;
 
diff --git a/llvm/test/tools/llvm-objcopy/DXContainer/extract-basic.test b/llvm/test/tools/llvm-objcopy/DXContainer/extract-basic.test
new file mode 100644
index 0000000000000..c4fbd5bd29845
--- /dev/null
+++ b/llvm/test/tools/llvm-objcopy/DXContainer/extract-basic.test
@@ -0,0 +1,306 @@
+## Tests that a separate DXContainer is created for the RTS0 (root signature)
+## part, specified with --extract-section specified
+
+# RUN: yaml2obj %s -o %t
+# RUN: llvm-objcopy %t --extract-section=RTS0=%t.rts0.out
+# RUN: obj2yaml %t.rts0.out | FileCheck %s
+
+## The DXContainer described below was generated with:
+
+## `clang-dxc -T cs_6_7 test.hlsl /Fo temp.dxo`
+## `obj2yaml temp.dxo`
+
+## ``` test.hlsl
+## [RootSignature("")]
+## [numthreads(1,1,1)]
+## void main() {}
+## ```
+
+--- !dxcontainer
+Header:
+  Hash:            [ 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
+                     0x0, 0x0, 0x0, 0x0, 0x0, 0x0 ]
+  Version:
+    Major:           1
+    Minor:           0
+# CHECK: FileSize:       68
+  FileSize:        1984
+# CHECK-NEXT: PartCount:     1
+# CHECK-NEXT: PartOffsets:   [ 36 ]
+  PartCount:       7
+  PartOffsets:     [ 60, 1792, 1808, 1836, 1852, 1868, 1900 ]
+# CHECK-NEXT: Parts:
+Parts:
+# CHECK-NOT: DXIL
+# CHECK-NOT: SFI0
+# CHECK-NOT: HASH
+# CHECK-NOT: ISG1
+# CHECK-NOT: OSG1
+# CHECK: Name:            RTS0
+# CHECK-NOT: PSV0
+  - Name:            DXIL
+    Size:            1724
+    Program:
+      MajorVersion:    6
+      MinorVersion:    7
+      ShaderKind:      5
+      Size:            431
+      DXILMajorVersion: 1
+      DXILMinorVersion: 7
+      DXILSize:        1700
+      DXIL:            [ 0x42, 0x43, 0xC0, 0xDE, 0x21, 0xC, 0x0, 0x0, 0xA6,
+                         0x1, 0x0, 0x0, 0xB, 0x82, 0x20, 0x0, 0x2, 0x0,
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+                         0x91, 0x41, 0xC8, 0x4, 0x49, 0x6, 0x10, 0x32,
+                         0x39, 0x92, 0x1, 0x84, 0xC, 0x25, 0x5, 0x8, 0x19,
+                         0x1E, 0x4, 0x8B, 0x62, 0x80, 0x10, 0x45, 0x2,
+                         0x42, 0x92, 0xB, 0x42, 0x84, 0x10, 0x32, 0x14,
+                         0x38, 0x8, 0x18, 0x4B, 0xA, 0x32, 0x42, 0x88,
+                         0x48, 0x90, 0x14, 0x20, 0x43, 0x46, 0x88, 0xA5,
+                         0x0, 0x19, 0x32, 0x42, 0xE4, 0x48, 0xE, 0x90,
+                         0x11, 0x22, 0xC4, 0x50, 0x41, 0x51, 0x81, 0x8C,
+                         0xE1, 0x83, 0xE5, 0x8A, 0x4, 0x21, 0x46, 0x6,
+                         0x51, 0x18, 0x0, 0x0, 0x4, 0x0, 0x0, 0x0, 0x1B,
+                         0x90, 0xE0, 0xFF, 0xFF, 0xFF, 0xFF, 0x7, 0xC0,
+                         0x1, 0x24, 0x80, 0x2, 0x0, 0x0, 0x0, 0x49, 0x18,
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+                         0x72, 0x98, 0xB1, 0x94, 0x1, 0x3C, 0x8C, 0xC3,
+                         0x3C, 0x94, 0xC3, 0x38, 0xD0, 0x43, 0x3A, 0xBC,
+                         0x83, 0x3B, 0xCC, 0xC3, 0x8C, 0xC5, 0xC, 0x48,
+                         0x21, 0x15, 0x42, 0x61, 0x1E, 0xE6, 0x21, 0x1D,
+                         0xCE, 0xC1, 0x1D, 0x52, 0x81, 0x14, 0x66, 0x4C,
+                         0x67, 0x30, 0xE, 0xEF, 0x20, 0xF, 0xEF, 0xE0,
+                         0x6, 0xEF, 0x50, 0xF, 0xF4, 0x30, 0xF, 0xE9, 0x40,
+                         0xE, 0xE5, 0xE0, 0x6, 0xE6, 0x20, 0xF, 0xE1, 0xD0,
+                         0xE, 0xE5, 0x30, 0xA3, 0x40, 0x83, 0x76, 0x68,
+                         0x7, 0x79, 0x8, 0x87, 0x19, 0x52, 0x1A, 0xB8,
+                         0xC3, 0x3B, 0x84, 0x3, 0x3B, 0xA4, 0x43, 0x38,
+                         0xCC, 0x83, 0x1B, 0x84, 0x3, 0x39, 0x90, 0x83,
+                         0x3C, 0xCC, 0x3, 0x3C, 0x84, 0xC3, 0x38, 0x94,
+                         0xC3, 0xC, 0x46, 0xD, 0xC6, 0x21, 0x1C, 0xD8,
+                         0x81, 0x1D, 0xCA, 0xA1, 0x1C, 0x7E, 0x81, 0x1E,
+                         0xF2, 0x1, 0x1E, 0xCA, 0x61, 0x86, 0xB3, 0x6,
+                         0xE4, 0x80, 0xF, 0x6E, 0xE0, 0xE, 0xEF, 0xE0,
+                         0xE, 0xF5, 0xE0, 0xE, 0xE9, 0x60, 0xE, 0xEF, 0x20,
+                         0xF, 0xED, 0x30, 0xA3, 0x62, 0x3, 0x72, 0xC0,
+                         0x7, 0x37, 0x18, 0x87, 0x77, 0x70, 0x7, 0x7A,
+                         0x90, 0x87, 0x77, 0x60, 0x7, 0x73, 0x60, 0x87,
+                         0x77, 0xB8, 0x7, 0x37, 0x40, 0x87, 0x74, 0x70,
+                         0x7, 0x7A, 0x98, 0x87, 0x19, 0x4B, 0x1B, 0x90,
+                         0x3, 0x3E, 0xB8, 0x1, 0x3C, 0xC8, 0x43, 0x39,
+                         0x8C, 0x43, 0x3A, 0xCC, 0x43, 0x39, 0x0, 0x0,
+                         0x79, 0x28, 0x0, 0x0, 0x53, 0x0, 0x0, 0x0, 0xC2,
+                         0x3C, 0x90, 0x40, 0x86, 0x10, 0x19, 0x32, 0xE2,
+                         0x64, 0x90, 0x40, 0x46, 0x2, 0x19, 0x23, 0x23,
+                         0x46, 0x2, 0x13, 0x24, 0xC6, 0x0, 0x13, 0x74,
+                         0xD4, 0x61, 0x8C, 0x2D, 0xCC, 0xED, 0xC, 0xC4,
+                         0xAE, 0x4C, 0x6E, 0x2E, 0xED, 0xCD, 0xD, 0x44,
+                         0x46, 0xC6, 0x5, 0xC6, 0x5, 0xE6, 0x2C, 0x8D,
+                         0xE, 0x4, 0xE5, 0x2C, 0x8D, 0xE, 0xE8, 0x2C, 0x8D,
+                         0xE, 0xAD, 0x4E, 0xCC, 0x65, 0xEC, 0xAD, 0x4D,
+                         0x27, 0xCD, 0x4D, 0xAC, 0x8C, 0x2D, 0x6D, 0xEC,
+                         0x85, 0x8D, 0xCD, 0xAE, 0xAD, 0x5, 0x4E, 0xEE,
+                         0x4D, 0xAD, 0x6C, 0x8C, 0xCE, 0xE5, 0x2C, 0x8D,
+                         0xE, 0x84, 0x86, 0xC6, 0xCC, 0xC6, 0x86, 0x4C,
+                         0xC, 0x87, 0x6C, 0xEC, 0x26, 0x67, 0x46, 0x26,
+                         0x67, 0x6C, 0xA6, 0xCC, 0x66, 0x8C, 0xC6, 0x2C,
+                         0xEC, 0x26, 0xC, 0x26, 0x2C, 0xEC, 0x26, 0xCC,
+                         0xCC, 0x86, 0x6, 0xE6, 0x6, 0x26, 0xE7, 0x86,
+                         0xE6, 0x26, 0xE5, 0x8, 0x63, 0x73, 0x87, 0x68,
+                         0xB, 0x4B, 0x73, 0x3B, 0xCA, 0xDD, 0x18, 0x5A,
+                         0x98, 0xDC, 0xD7, 0x5C, 0x9A, 0x5E, 0xD9, 0x69,
+                         0xCC, 0xE4, 0xC2, 0xDA, 0xCA, 0x5A, 0xE0, 0xDE,
+                         0xD2, 0xDC, 0xE8, 0xCA, 0xE4, 0x86, 0x20, 0x1C,
+                         0xC1, 0x10, 0x84, 0x43,...
[truncated]

``````````

</details>


https://github.com/llvm/llvm-project/pull/154804


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