================
@@ -440,6 +452,42 @@ void WebAssemblyAsmPrinter::emitEndOfAsmFile(Module &M) {
EmitProducerInfo(M);
EmitTargetFeatures(M);
EmitFunctionAttributes(M);
+
+ // Subtarget may be null if no functions have been defined in file
+ if (Subtarget && Subtarget->hasBranchHinting())
+ emitBranchHintSection();
+}
+
+void WebAssemblyAsmPrinter::emitBranchHintSection() const {
+ MCSectionWasm *BranchHintsSection = OutContext.getWasmSection(
+ ".custom_section.metadata.code.branch_hint", SectionKind::getMetadata());
+ const uint32_t NumFunctionHints =
+ std::count_if(BranchHints.begin(), BranchHints.end(),
+ [](const auto &BHR) { return !BHR.Hints.empty(); });
+ if (NumFunctionHints == 0)
+ return;
+ OutStreamer->pushSection();
+ OutStreamer->switchSection(BranchHintsSection);
+ OutStreamer->emitULEB128IntValue(NumFunctionHints);
+ for (const auto &BHR : BranchHints) {
+ if (BHR.Hints.empty())
+ continue;
+ // emit relocatable function index for the function symbol
+ OutStreamer->emitULEB128Value(MCSymbolRefExpr::create(
+ BHR.FuncSym, WebAssembly::S_FUNCINDEX, OutContext));
+ // emit the number of hints for this function (is constant -> does not need
+ // handling by target streamer for reloc)
+ OutStreamer->emitULEB128IntValue(BHR.Hints.size());
+ for (const auto &[instrSym, hint] : BHR.Hints) {
+ assert(hint == 0 || hint == 1);
+ // offset from function start
+ OutStreamer->emitULEB128Value(MCSymbolRefExpr::create(
+ instrSym, WebAssembly::S_DEBUG_REF, OutContext));
----------------
Lukasdoe wrote:
resolved since it is no longer required :)
https://github.com/llvm/llvm-project/pull/146230
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