================
@@ -103,30 +110,222 @@ static cl::opt<bool>
ICPDUMPAFTER("icp-dumpafter", cl::init(false), cl::Hidden,
cl::desc("Dump IR after transformation happens"));
+// This option is meant to be used by LLVM regression test and test the
+// transformation that compares vtables.
+static cl::opt<bool> ICPEnableVTableCmp(
+ "icp-enable-vtable-cmp", cl::init(false), cl::Hidden,
+ cl::desc("If ThinLTO and WPD is enabled and this option is true, "
+ "indirect-call promotion pass will compare vtables rather than "
+ "functions for speculative devirtualization of virtual calls."
+ " If set to false, indirect-call promotion pass will always "
+ "compare functions."));
+
+static cl::opt<float>
+ ICPVTableCountPercentage("icp-vtable-count-percentage", cl::init(0.99),
+ cl::Hidden,
+ cl::desc("Percentage of vtable count to
compare"));
+
+static cl::opt<int> ICPNumAdditionalVTableLast(
+ "icp-num-additional-vtable-last", cl::init(0), cl::Hidden,
+ cl::desc("The number of additional instruction for the last candidate"));
+
namespace {
+using VTableAddressPointOffsetValMap =
+ SmallDenseMap<const GlobalVariable *, SmallDenseMap<int, Constant *, 4>,
8>;
+
+// A struct to collect type information for a virtual call site.
+struct VirtualCallSiteInfo {
+ // The offset from the address point to virtual function in the vtable.
+ uint64_t FunctionOffset;
+ // The instruction that computes the address point of vtable.
+ Instruction *VPtr;
+ // The compatible type used in LLVM type intrinsics.
+ StringRef CompatibleTypeStr;
+};
+
+// The key is a virtual call, and value is its type information.
+using VirtualCallSiteTypeInfoMap =
+ SmallDenseMap<const CallBase *, VirtualCallSiteInfo, 8>;
+
+// Find the offset where type string is `CompatibleType`.
+static std::optional<uint64_t>
+getCompatibleTypeOffset(const GlobalVariable &VTableVar,
+ StringRef CompatibleType) {
+ SmallVector<MDNode *, 2> Types; // type metadata associated with a vtable.
+ VTableVar.getMetadata(LLVMContext::MD_type, Types);
+
+ for (MDNode *Type : Types)
----------------
david-xl wrote:
why can it have more than one types?
https://github.com/llvm/llvm-project/pull/81442
_______________________________________________
cfe-commits mailing list
cfe-commits@lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
