Examples with LLVMMemoryBufferRef org.bytedeco.llvm.LLVM.LLVMMemoryBufferRef used on opensource projects

Example 1 with LLVMMemoryBufferRef

use of org.bytedeco.llvm.LLVM.LLVMMemoryBufferRef in project javacpp-presets by bytedeco.

the class EmitBitcode method EvaluateBitcode.

/**
 * Sample code for importing a LLVM bitcode file and running a function
 * inside of the imported module
 * <p>
 * This sample depends on EmitBitcode to produce the bitcode file. Make sure
 * you've ran the EmitBitcode sample and have the 'sum.bc' bitcode file.
 * <p>
 * This sample contains code for the following steps:
 * <p>
 * 1. Initializing required LLVM components
 * 2. Load and parse the bitcode
 * 3. Run the 'sum' function inside the module
 * 4. Dispose of the allocated resources
 */
public static void EvaluateBitcode() {
    // Stage 1: Initialize LLVM components
    LLVMInitializeCore(LLVMGetGlobalPassRegistry());
    LLVMInitializeNativeAsmPrinter();
    LLVMInitializeNativeAsmParser();
    LLVMInitializeNativeTarget();
    // Stage 2: Load and parse bitcode
    LLVMContextRef context = LLVMContextCreate();
    LLVMTypeRef i32Type = LLVMInt32TypeInContext(context);
    LLVMModuleRef module = new LLVMModuleRef();
    LLVMMemoryBufferRef membuf = new LLVMMemoryBufferRef();
    BytePointer inputFile = new BytePointer("./sum.bc");
    if (LLVMCreateMemoryBufferWithContentsOfFile(inputFile, membuf, error) != 0) {
        System.err.println("Failed to read file into memory buffer: " + error.getString());
        LLVMDisposeMessage(error);
        return;
    }
    if (LLVMParseBitcodeInContext2(context, membuf, module) != 0) {
        System.err.println("Failed to parser module from bitcode");
        return;
    }
    LLVMExecutionEngineRef engine = new LLVMExecutionEngineRef();
    if (LLVMCreateInterpreterForModule(engine, module, error) != 0) {
        System.err.println("Failed to create LLVM interpreter: " + error.getString());
        LLVMDisposeMessage(error);
        return;
    }
    LLVMValueRef sum = LLVMGetNamedFunction(module, "sum");
    PointerPointer<Pointer> arguments = new PointerPointer<>(2).put(0, LLVMCreateGenericValueOfInt(i32Type, 42, /* signExtend */
    0)).put(1, LLVMCreateGenericValueOfInt(i32Type, 30, /* signExtend */
    0));
    LLVMGenericValueRef result = LLVMRunFunction(engine, sum, 2, arguments);
    System.out.println();
    System.out.print("The result of add(42, 30) imported from bitcode and executed with LLVM interpreter is: ");
    System.out.println(LLVMGenericValueToInt(result, /* signExtend */
    0));
    // Stage 4: Dispose of the allocated resources
    LLVMDisposeModule(module);
    LLVMContextDispose(context);
}