It's not necessary to do rounding for alloca operations when the requested
alignment is equal to the stack alignment.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40004 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/examples/HowToUseJIT/HowToUseJIT.cpp b/examples/HowToUseJIT/HowToUseJIT.cpp
new file mode 100644
index 0000000..621621d
--- /dev/null
+++ b/examples/HowToUseJIT/HowToUseJIT.cpp
@@ -0,0 +1,112 @@
+//===-- examples/HowToUseJIT/HowToUseJIT.cpp - An example use of the JIT --===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by Valery A. Khamenya and is distributed under the
+// University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This small program provides an example of how to quickly build a small
+// module with two functions and execute it with the JIT.
+//
+// Goal:
+// The goal of this snippet is to create in the memory
+// the LLVM module consisting of two functions as follow:
+//
+// int add1(int x) {
+// return x+1;
+// }
+//
+// int foo() {
+// return add1(10);
+// }
+//
+// then compile the module via JIT, then execute the `foo'
+// function and return result to a driver, i.e. to a "host program".
+//
+// Some remarks and questions:
+//
+// - could we invoke some code using noname functions too?
+// e.g. evaluate "foo()+foo()" without fears to introduce
+// conflict of temporary function name with some real
+// existing function name?
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Module.h"
+#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Instructions.h"
+#include "llvm/ModuleProvider.h"
+#include "llvm/ExecutionEngine/JIT.h"
+#include "llvm/ExecutionEngine/Interpreter.h"
+#include "llvm/ExecutionEngine/GenericValue.h"
+#include <iostream>
+using namespace llvm;
+
+int main() {
+ // Create some module to put our function into it.
+ Module *M = new Module("test");
+
+ // Create the add1 function entry and insert this entry into module M. The
+ // function will have a return type of "int" and take an argument of "int".
+ // The '0' terminates the list of argument types.
+ Function *Add1F =
+ cast<Function>(M->getOrInsertFunction("add1", Type::Int32Ty, Type::Int32Ty,
+ (Type *)0));
+
+ // Add a basic block to the function. As before, it automatically inserts
+ // because of the last argument.
+ BasicBlock *BB = new BasicBlock("EntryBlock", Add1F);
+
+ // Get pointers to the constant `1'.
+ Value *One = ConstantInt::get(Type::Int32Ty, 1);
+
+ // Get pointers to the integer argument of the add1 function...
+ assert(Add1F->arg_begin() != Add1F->arg_end()); // Make sure there's an arg
+ Argument *ArgX = Add1F->arg_begin(); // Get the arg
+ ArgX->setName("AnArg"); // Give it a nice symbolic name for fun.
+
+ // Create the add instruction, inserting it into the end of BB.
+ Instruction *Add = BinaryOperator::createAdd(One, ArgX, "addresult", BB);
+
+ // Create the return instruction and add it to the basic block
+ new ReturnInst(Add, BB);
+
+ // Now, function add1 is ready.
+
+
+ // Now we going to create function `foo', which returns an int and takes no
+ // arguments.
+ Function *FooF =
+ cast<Function>(M->getOrInsertFunction("foo", Type::Int32Ty, (Type *)0));
+
+ // Add a basic block to the FooF function.
+ BB = new BasicBlock("EntryBlock", FooF);
+
+ // Get pointers to the constant `10'.
+ Value *Ten = ConstantInt::get(Type::Int32Ty, 10);
+
+ // Pass Ten to the call call:
+ CallInst *Add1CallRes = new CallInst(Add1F, Ten, "add1", BB);
+ Add1CallRes->setTailCall(true);
+
+ // Create the return instruction and add it to the basic block.
+ new ReturnInst(Add1CallRes, BB);
+
+ // Now we create the JIT.
+ ExistingModuleProvider* MP = new ExistingModuleProvider(M);
+ ExecutionEngine* EE = ExecutionEngine::create(MP, false);
+
+ std::cout << "We just constructed this LLVM module:\n\n" << *M;
+ std::cout << "\n\nRunning foo: " << std::flush;
+
+ // Call the `foo' function with no arguments:
+ std::vector<GenericValue> noargs;
+ GenericValue gv = EE->runFunction(FooF, noargs);
+
+ // Import result of execution:
+ std::cout << "Result: " << gv.IntVal.toString(10) << "\n";
+ return 0;
+}
diff --git a/examples/HowToUseJIT/Makefile b/examples/HowToUseJIT/Makefile
new file mode 100644
index 0000000..fbacc2d
--- /dev/null
+++ b/examples/HowToUseJIT/Makefile
@@ -0,0 +1,15 @@
+##===- examples/HowToUseJIT/Makefile -----------------------*- Makefile -*-===##
+#
+# The LLVM Compiler Infrastructure
+#
+# This file was developed by Valery A. Khamenya and is distributed under
+# the University of Illinois Open Source License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+LEVEL = ../..
+TOOLNAME = HowToUseJIT
+EXAMPLE_TOOL = 1
+
+LINK_COMPONENTS := jit interpreter native
+
+include $(LEVEL)/Makefile.common