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//===-------- BasicOrcV2CBindings.c - Basic OrcV2 C Bindings Demo ---------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm-c/Core.h"
#include "llvm-c/Error.h"
#include "llvm-c/Initialization.h"
#include "llvm-c/LLJIT.h"
#include "llvm-c/Support.h"
#include "llvm-c/Target.h"
#include "llvm-c/TargetMachine.h"
#include <stdio.h>
int handleError(LLVMErrorRef Err) {
char *ErrMsg = LLVMGetErrorMessage(Err);
fprintf(stderr, "Error: %s\n", ErrMsg);
LLVMDisposeErrorMessage(ErrMsg);
return 1;
}
LLVMModuleRef createDemoModule(LLVMContextRef Ctx) {
// Create a new LLVM module.
LLVMModuleRef M = LLVMModuleCreateWithNameInContext("demo", Ctx);
// Add a "sum" function":
// - Create the function type and function instance.
LLVMTypeRef ParamTypes[] = {LLVMInt32Type(), LLVMInt32Type()};
LLVMTypeRef SumFunctionType =
LLVMFunctionType(LLVMInt32Type(), ParamTypes, 2, 0);
LLVMValueRef SumFunction = LLVMAddFunction(M, "sum", SumFunctionType);
// - Add a basic block to the function.
LLVMBasicBlockRef EntryBB = LLVMAppendBasicBlock(SumFunction, "entry");
// - Add an IR builder and point it at the end of the basic block.
LLVMBuilderRef Builder = LLVMCreateBuilder();
LLVMPositionBuilderAtEnd(Builder, EntryBB);
// - Get the two function arguments and use them co construct an "add"
// instruction.
LLVMValueRef SumArg0 = LLVMGetParam(SumFunction, 0);
LLVMValueRef SumArg1 = LLVMGetParam(SumFunction, 1);
LLVMValueRef Result = LLVMBuildAdd(Builder, SumArg0, SumArg1, "result");
// - Build the return instruction.
LLVMBuildRet(Builder, Result);
return M;
}
int main(int argc, char *argv[]) {
int MainResult = 0;
// Parse command line arguments and initialize LLVM Core.
LLVMParseCommandLineOptions(argc, (const char **)argv, "");
LLVMInitializeCore(LLVMGetGlobalPassRegistry());
// Initialize native target codegen and asm printer.
LLVMInitializeNativeTarget();
LLVMInitializeNativeAsmPrinter();
// Create the JIT instance.
LLVMOrcLLJITRef J;
{
LLVMErrorRef Err;
if ((Err = LLVMOrcCreateLLJIT(&J, 0))) {
MainResult = handleError(Err);
goto llvm_shutdown;
}
}
// Create our demo object file.
LLVMMemoryBufferRef ObjectFileBuffer;
{
// Create a module.
LLVMContextRef Ctx = LLVMContextCreate();
LLVMModuleRef M = createDemoModule(Ctx);
// Get the Target.
const char *Triple = LLVMOrcLLJITGetTripleString(J);
LLVMTargetRef Target = 0;
char *ErrorMsg = 0;
if (LLVMGetTargetFromTriple(Triple, &Target, &ErrorMsg)) {
fprintf(stderr, "Error getting target for %s: %s\n", Triple, ErrorMsg);
LLVMDisposeModule(M);
LLVMContextDispose(Ctx);
goto jit_cleanup;
}
// Construct a TargetMachine.
LLVMTargetMachineRef TM =
LLVMCreateTargetMachine(Target, Triple, "", "", LLVMCodeGenLevelNone,
LLVMRelocDefault, LLVMCodeModelDefault);
// Run CodeGen to produce the buffer.
if (LLVMTargetMachineEmitToMemoryBuffer(TM, M, LLVMObjectFile, &ErrorMsg,
&ObjectFileBuffer)) {
fprintf(stderr, "Error emitting object: %s\n", ErrorMsg);
LLVMDisposeTargetMachine(TM);
LLVMDisposeModule(M);
LLVMContextDispose(Ctx);
goto jit_cleanup;
}
}
// Add our object file buffer to the JIT.
{
LLVMOrcJITDylibRef MainJD = LLVMOrcLLJITGetMainJITDylib(J);
LLVMErrorRef Err;
if ((Err = LLVMOrcLLJITAddObjectFile(J, MainJD, ObjectFileBuffer))) {
MainResult = handleError(Err);
goto jit_cleanup;
}
}
// Look up the address of our demo entry point.
LLVMOrcJITTargetAddress SumAddr;
{
LLVMErrorRef Err;
if ((Err = LLVMOrcLLJITLookup(J, &SumAddr, "sum"))) {
MainResult = handleError(Err);
goto jit_cleanup;
}
}
// If we made it here then everything succeeded. Execute our JIT'd code.
int32_t (*Sum)(int32_t, int32_t) = (int32_t(*)(int32_t, int32_t))SumAddr;
int32_t Result = Sum(1, 2);
// Print the result.
printf("1 + 2 = %i\n", Result);
jit_cleanup:
// Destroy our JIT instance. This will clean up any memory that the JIT has
// taken ownership of. This operation is non-trivial (e.g. it may need to
// JIT static destructors) and may also fail. In that case we want to render
// the error to stderr, but not overwrite any existing return value.
{
LLVMErrorRef Err;
if ((Err = LLVMOrcDisposeLLJIT(J))) {
int NewFailureResult = handleError(Err);
if (MainResult == 0)
MainResult = NewFailureResult;
}
}
llvm_shutdown:
// Shut down LLVM.
LLVMShutdown();
return MainResult;
}
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