Store HIR func in LIR func

Summary:
The LIR inliner wants to know the HIR func's name.  Right now we're fetching it
from the HIR call instruction.  Instead track the HIR function and use that
instead.

Reviewed By: yoney

Differential Revision: D88279069

fbshipit-source-id: 56eb2a3c76e97474c8e4e1c5ae4603f1b0791e50

Author: alexmalyshev

cinderx/Jit/lir/function.cpp

@@ -169,6 +169,8 @@ void deepCopyBasicBlocks(
 
 } // namespace
 
+Function::Function(const hir::Function* hir_func) : hir_func_{hir_func} {}
+
 int Function::allocateId() {
   return next_id_++;
 }
@@ -254,4 +256,8 @@ void Function::sortBasicBlocks() {
   basic_blocks_ = sorter.getSortedBlocks();
 }
 
+const hir::Function* Function::hirFunc() const {
+  return hir_func_;
+}
+
 } // namespace jit::lir

cinderx/Jit/lir/function.h

@@ -7,6 +7,10 @@
 #include <deque>
 #include <vector>
 
+namespace jit::hir {
+class Function;
+}
+
 namespace jit::lir {
 
 class Function {
@@ -16,6 +20,8 @@ class Function {
     int end_bb;
   };
 
+  explicit Function(const hir::Function* hir_func = nullptr);
+
   // Allocate a new ID for a basic block or an instruction.
   int allocateId();
 
@@ -54,7 +60,11 @@ class Function {
 
   void sortBasicBlocks();
 
+  const hir::Function* hirFunc() const;
+
  private:
+  const hir::Function* hir_func_;
+
   // The containers below hold all the basic blocks for the Function. The deque
   // holds the actual data for blocks and the vector holds their (eventually)
   // sorted order.

cinderx/Jit/lir/generator.cpp

@@ -283,7 +283,7 @@ void LIRGenerator::AnalyzeCopies() {
 std::unique_ptr<jit::lir::Function> LIRGenerator::TranslateFunction() {
   AnalyzeCopies();
 
-  auto function = std::make_unique<jit::lir::Function>();
+  auto function = std::make_unique<jit::lir::Function>(func_);
   lir_func_ = function.get();
 
   // generate entry block and exit block

cinderx/Jit/lir/inliner.cpp

@@ -359,11 +359,10 @@ void LIRInliner::resolveReturnValue() {
 }
 
 std::string_view LIRInliner::callerName() {
-  const hir::Instr* hir_call = call_instr_->origin();
-  if (hir_call == nullptr) {
-    return "<unnamed LIR function>";
+  if (auto hir_func = caller_->hirFunc()) {
+    return hir_func->fullname;
   }
-  return hir_call->block()->cfg->func->fullname;
+  return "<unnamed LIR function>";
 }
 
 } // namespace jit::lir