[PATCH] D61105: [MS] Emit S_HEAPALLOCSITE debug info in SelectionDAG

[Amy Huang via Phabricator via llvm-commits]

akhuang created this revision.
akhuang added a reviewer: rnk.
Herald added subscribers: llvm-commits, hiraditya, aprantl, MatzeB.
Herald added a project: LLVM.

This emits labels around heapallocsite calls in SelectionDAG.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D61105

Files:
  llvm/include/llvm/CodeGen/SelectionDAG.h
  llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/label-heapallocsite.ll


Index: llvm/test/CodeGen/X86/label-heapallocsite.ll
===================================================================
--- llvm/test/CodeGen/X86/label-heapallocsite.ll
+++ llvm/test/CodeGen/X86/label-heapallocsite.ll
@@ -1,5 +1,5 @@
+; RUN: llc < %s | FileCheck %s
 ; RUN: llc -O0 < %s | FileCheck %s
-; FIXME: Add test for llc with optimizations once it is implemented.
 
 ; Source to regenerate:
 ; $ clang --target=x86_64-windows-msvc -S heapallocsite.c  -g -gcodeview -o t.ll \
Index: llvm/lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- llvm/lib/Target/X86/X86ISelLowering.cpp
+++ llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -4095,6 +4095,11 @@
   }
   InFlag = Chain.getValue(1);
 
+  // Save heapallocsite metadata.
+  if (CLI.CS && CLI.CS->getMetadata("heapallocsite"))
+    CLI.DAG.addHeapAllocSite(Chain.getNode(),
+                             CLI.CS->getMetadata("heapallocsite"));
+
   // Create the CALLSEQ_END node.
   unsigned NumBytesForCalleeToPop;
   if (X86::isCalleePop(CallConv, Is64Bit, isVarArg,
Index: llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
===================================================================
--- llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
+++ llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
@@ -903,6 +903,10 @@
       // Remember the source order of the inserted instruction.
       if (HasDbg)
         ProcessSourceNode(N, DAG, Emitter, VRBaseMap, Orders, Seen, NewInsn);
+
+      if (MDNode* MD = DAG->getHeapAllocSite(N))
+        MF.addCodeViewHeapAllocSite(NewInsn, MD);
+
       GluedNodes.pop_back();
     }
     auto NewInsn =
@@ -911,6 +915,8 @@
     if (HasDbg)
       ProcessSourceNode(SU->getNode(), DAG, Emitter, VRBaseMap, Orders, Seen,
                         NewInsn);
+    if (MDNode* MD = DAG->getHeapAllocSite(SU->getNode()))
+      MF.addCodeViewHeapAllocSite(NewInsn, MD);
   }
 
   // Insert all the dbg_values which have not already been inserted in source
Index: llvm/include/llvm/CodeGen/SelectionDAG.h
===================================================================
--- llvm/include/llvm/CodeGen/SelectionDAG.h
+++ llvm/include/llvm/CodeGen/SelectionDAG.h
@@ -267,6 +267,9 @@
   /// Tracks dbg_value and dbg_label information through SDISel.
   SDDbgInfo *DbgInfo;
 
+  /// Save nodes with heapallocsite metadata.
+  DenseMap<const SDNode*, MDNode*> CodeViewHeapAllocSites;
+
   uint16_t NextPersistentId = 0;
 
 public:
@@ -1626,6 +1629,18 @@
            isConstantFPBuildVectorOrConstantFP(N);
   }
 
+  void addHeapAllocSite(const SDNode* Node, MDNode* MD) {
+    CodeViewHeapAllocSites.insert({Node, MD});
+  }
+
+  /// Return the HeapAllocSite type associated with the SDNode, if it exists.
+  MDNode *getHeapAllocSite(const SDNode* Node) {
+    if (CodeViewHeapAllocSites.find(Node) == CodeViewHeapAllocSites.end())
+      return nullptr;
+    return CodeViewHeapAllocSites[Node];
+  }
+
+
 private:
   void InsertNode(SDNode *N);
   bool RemoveNodeFromCSEMaps(SDNode *N);


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