[IR][PGO] Verify the structure of VP metadata.

[mtrofin]

No description provided.

[mtrofin]

• [IR][PGO] Verify the structure of VP metadata. #145584 👈 (View in Graphite)
• [IR][PGO] Verify invalid MD_prof metadata on instructions #145576 : 2 other dependent PRs (#145578 , #145721 )
• main

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[github-actions]

✅ With the latest revision this PR passed the C/C++ code formatter.

[snehasish]

I didn't follow the memops comment. Can you elaborate?

[mtrofin]

it was WIP. Fixed.

[llvmbot]

@llvm/pr-subscribers-llvm-ir

Author: Mircea Trofin (mtrofin)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/145584.diff

3 Files Affected:

• (modified) llvm/include/llvm/IR/ProfDataUtils.h (+3)
• (modified) llvm/lib/IR/ProfDataUtils.cpp (+1-1)
• (modified) llvm/lib/IR/Verifier.cpp (+16-2)

diff --git a/llvm/include/llvm/IR/ProfDataUtils.h b/llvm/include/llvm/IR/ProfDataUtils.h
index 5c0e08b03c245..c24b2aa19a407 100644
--- a/llvm/include/llvm/IR/ProfDataUtils.h
+++ b/llvm/include/llvm/IR/ProfDataUtils.h
@@ -35,6 +35,9 @@ LLVM_ABI bool hasProfMD(const Instruction &I);
 /// Checks if an MDNode contains Branch Weight Metadata
 LLVM_ABI bool isBranchWeightMD(const MDNode *ProfileData);
 
+/// Checks if an MDNode contains value profiling Metadata
+LLVM_ABI bool isValueProfileMD(const MDNode *ProfileData);
+
 /// Checks if an instructions has Branch Weight Metadata
 ///
 /// \param I The instruction to check
diff --git a/llvm/lib/IR/ProfDataUtils.cpp b/llvm/lib/IR/ProfDataUtils.cpp
index 740023ca6d23b..605208edda70a 100644
--- a/llvm/lib/IR/ProfDataUtils.cpp
+++ b/llvm/lib/IR/ProfDataUtils.cpp
@@ -103,7 +103,7 @@ bool isBranchWeightMD(const MDNode *ProfileData) {
   return isTargetMD(ProfileData, MDProfLabels::BranchWeights, MinBWOps);
 }
 
-static bool isValueProfileMD(const MDNode *ProfileData) {
+bool isValueProfileMD(const MDNode *ProfileData) {
   return isTargetMD(ProfileData, MDProfLabels::ValueProfile, MinVPOps);
 }
 
diff --git a/llvm/lib/IR/Verifier.cpp b/llvm/lib/IR/Verifier.cpp
index 9cab88b09779a..26d3b8b49598b 100644
--- a/llvm/lib/IR/Verifier.cpp
+++ b/llvm/lib/IR/Verifier.cpp
@@ -112,6 +112,7 @@
 #include "llvm/IR/Value.h"
 #include "llvm/InitializePasses.h"
 #include "llvm/Pass.h"
+#include "llvm/ProfileData/InstrProf.h"
 #include "llvm/Support/AMDGPUAddrSpace.h"
 #include "llvm/Support/AtomicOrdering.h"
 #include "llvm/Support/Casting.h"
@@ -5026,9 +5027,22 @@ void Verifier::visitProfMetadata(Instruction &I, MDNode *MD) {
       Check(mdconst::dyn_extract<ConstantInt>(MDO),
             "!prof brunch_weights operand is not a const int");
     }
+  } else if (ProfName == MDProfLabels::ValueProfile) {
+    Check(isValueProfileMD(MD),"invalid value profiling metadata",MD);
+    ConstantInt *KindInt = mdconst::dyn_extract<ConstantInt>(MD->getOperand(1));
+    Check(KindInt, "VP !prof missing kind argument", MD);
+
+    auto Kind = KindInt->getZExtValue();
+    Check(Kind >= InstrProfValueKind::IPVK_First &&
+              Kind <= InstrProfValueKind::IPVK_Last,
+          "Invalid VP !prof kind", MD);
+    if (Kind == InstrProfValueKind::IPVK_IndirectCallTarget || Kind == InstrProfValueKind::IPVK_MemOPSize)
+      Check(isa<CallBase>(I),
+            "VP !prof indirect call or memop size expected to be applied to "
+            "CallBase instructions only",
+            MD);
   } else {
-    Check(ProfName == MDProfLabels::ValueProfile,
-          "expected either branch_weights or VP profile name", MD);
+    CheckFailed("expected either branch_weights or VP profile name", MD);
   }
 }
 

[Copilot]

Pull Request Overview

This PR adds support for verifying the structure of “VP” (value profiling) metadata in LLVM IR, ensuring correct kinds, operand counts, and proper attachment points.

• Introduce isValueProfileMD utility and expose it in the public header.
• Implement checks in Verifier::visitProfMetadata for VP metadata kind, argument count, and placement.
• Add new lit tests in value-profile.ll for valid and invalid VP metadata scenarios.

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
llvm/test/Verifier/value-profile.ll	Add tests for valid/invalid VP metadata kinds, counts, and use.
llvm/lib/IR/Verifier.cpp	Include InstrProf.h, implement VP metadata validation logic, and update error handling.
llvm/lib/IR/ProfDataUtils.cpp	Remove static to export isValueProfileMD for external use.
llvm/include/llvm/IR/ProfDataUtils.h	Declare isValueProfileMD in the public API.

Comments suppressed due to low confidence (1)

llvm/lib/IR/Verifier.cpp:5048

• The CheckFailed macro does not accept a metadata node argument; revert to using Check for consistency:

Check(ProfName == MDProfLabels::ValueProfile,
      "expected either branch_weights or VP profile name", MD);

    CheckFailed("expected either branch_weights or VP profile name", MD);

[teresajohnson]

lgtm with a couple of small fixes noted below

[mtrofin]

Merge activity

• Jun 30, 7:30 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• Jun 30, 7:31 PM UTC: @mtrofin merged this pull request with Graphite.

[chapuni]

This is potentially cyclic deps. Could we reorganize ProfileData or this?