Reactor: Add support for calling C functions.
Bug: b/130746922
Change-Id: I0255460280d126e471dea107ffe976a1d765a218
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/29335
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Reviewed-by: Nicolas Capens <nicolascapens@google.com>
diff --git a/src/Reactor/LLVMReactor.cpp b/src/Reactor/LLVMReactor.cpp
index fc9f5e9..9c453b7 100644
--- a/src/Reactor/LLVMReactor.cpp
+++ b/src/Reactor/LLVMReactor.cpp
@@ -3271,6 +3271,28 @@
return RValue<Long>(V(::builder->CreateCall(rdtsc)));
}
+
+ RValue<Pointer<Byte>> ConstantPointer(void const * ptr)
+ {
+ // Note: this should work for 32-bit pointers as well because 'inttoptr'
+ // is defined to truncate (and zero extend) if necessary.
+ auto ptrAsInt = ::llvm::ConstantInt::get(::llvm::Type::getInt64Ty(*::context), reinterpret_cast<uintptr_t>(ptr));
+ return RValue<Pointer<Byte>>(V(::builder->CreateIntToPtr(ptrAsInt, T(Pointer<Byte>::getType()))));
+ }
+
+ Value* Call(RValue<Pointer<Byte>> fptr, Type* retTy, std::initializer_list<Value*> args, std::initializer_list<Type*> argTys)
+ {
+ ::llvm::SmallVector<::llvm::Type*, 8> paramTys;
+ for (auto ty : argTys) { paramTys.push_back(T(ty)); }
+ auto funcTy = ::llvm::FunctionType::get(T(retTy), paramTys, false);
+
+ auto funcPtrTy = funcTy->getPointerTo();
+ auto funcPtr = ::builder->CreatePointerCast(V(fptr.value), funcPtrTy);
+
+ ::llvm::SmallVector<::llvm::Value*, 8> arguments;
+ for (auto arg : args) { arguments.push_back(V(arg)); }
+ return V(::builder->CreateCall(funcPtr, arguments));
+ }
}
namespace rr
