[llvm] [SampleFDO][TypeProf]Support vtable type profiling for ext-binary and text format (PR #148002)

[Mingming Liu via llvm-commits]

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@@ -197,8 +197,32 @@ enum class LineType {
   CallSiteProfile,
   BodyProfile,
   Metadata,
+  VirtualCallTypeProfile,
 };
 
+// Parse `Input` as a white-space separated list of `vtable:count` pairs. An
+// example input line is `_ZTVbar:1471 _ZTVfoo:630`.
+static bool parseTypeCountMap(StringRef Input,
+                              DenseMap<StringRef, uint64_t> &TypeCountMap) {
+  for (size_t Index = Input.find_first_not_of(' '); Index != StringRef::npos;) {
+    size_t n1 = Input.find(':', Index);
+    if (n1 == StringRef::npos)
+      return false; // No colon found, invalid format.
+    StringRef TypeName = Input.substr(Index, n1 - Index);
+    // n2 is the start index of count.
+    size_t n2 = n1 + 1;
+    // n3 is the start index after the 'target:count' pair.
+    size_t n3 = Input.find_first_of(' ', n2);
+    uint64_t Count;
+    if (Input.substr(n2, n3 - n2).getAsInteger(10, Count))
+      return false; // Invalid count.
+    TypeCountMap[TypeName] = Count;
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mingmingl-llvm wrote:

this makes sense! done.

https://github.com/llvm/llvm-project/pull/148002