================
@@ -1642,6 +1642,94 @@ void AsmPrinter::emitStackUsage(const MachineFunction
&MF) {
*StackUsageStream << "static\n";
}
+/// Extracts a generalized numeric type identifier of a Function's type from
+/// type metadata. Returns null if metadata cannot be found.
+static ConstantInt *extractNumericCGTypeId(const Function &F) {
+ SmallVector<MDNode *, 2> Types;
+ F.getMetadata(LLVMContext::MD_type, Types);
+ for (const auto &Type : Types) {
+ if (Type->hasGeneralizedMDString()) {
+ MDString *MDGeneralizedTypeId = cast<MDString>(Type->getOperand(1));
+ uint64_t TypeIdVal = llvm::MD5Hash(MDGeneralizedTypeId->getString());
+ IntegerType *Int64Ty = Type::getInt64Ty(F.getContext());
+ return ConstantInt::get(Int64Ty, TypeIdVal);
+ }
+ }
+
+ return nullptr;
+}
+
+/// Emits .callgraph section.
+void AsmPrinter::emitCallGraphSection(const MachineFunction &MF,
+ FunctionInfo &FuncInfo) {
+ if (!MF.getTarget().Options.EmitCallGraphSection)
+ return;
+
+ // Switch to the call graph section for the function
+ MCSection *FuncCGSection =
+ getObjFileLowering().getCallGraphSection(*getCurrentSection());
+ assert(FuncCGSection && "null callgraph section");
+ OutStreamer->pushSection();
+ OutStreamer->switchSection(FuncCGSection);
+
+ // Emit format version number.
+ OutStreamer->emitInt64(0);
----------------
ilovepi wrote:
Lets use a constant defined somewhere for the version number, so its easy to
update. Probably looking at PGO profile versioning is a reasonable place to
take inspiration.
https://github.com/llvm/llvm-project/pull/87576
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