如何在LLVM中使用LLVMBuildGEP函数

LLVMValueRef LLVMBuildGEP(LLVMBuilderRef B, LLVMValueRef Pointer, LLVMValueRef *Indices, unsigned NumIndices, const char *Name);

LLVMBuilderRef builder = LLVMCreateBuilder();

LLVMTypeRef pointerType = LLVMPointerType(elementType, 0);
LLVMValueRef pointerValue = LLVMBuildAlloca(builder, pointerType, "ptr");

LLVMValueRef indices[] = { LLVMConstInt(LLVMInt32Type(), 0, 0), LLVMConstInt(LLVMInt32Type(), 1, 0) };

LLVMValueRef gepInstruction = LLVMBuildGEP(builder, pointerValue, indices, 2, "gep");

LLVMDumpValue(gepInstruction);

#include <llvm-c/Core.h>
#include <llvm-c/IRReader/IRReader.h>
#include <llvm-c/Support/SourceMgr.h>

int main() {
    LLVMInitializeCore(LLVMGetGlobalPassRegistry());

    LLVMModuleRef module = LLVMModuleCreateWithName("LLVMBuildGEPExample");
    LLVMBuilderRef builder = LLVMCreateBuilder();

    // 创建指针类型的值
    LLVMTypeRef elementType = LLVMInt32Type();
    LLVMTypeRef pointerType = LLVMPointerType(elementType, 0);
    LLVMValueRef pointerValue = LLVMBuildAlloca(builder, pointerType, "ptr");

    // 创建索引值的数组
    LLVMValueRef indices[] = { LLVMConstInt(LLVMInt32Type(), 0, 0), LLVMConstInt(LLVMInt32Type(), 1, 0) };

    // 调用LLVMBuildGEP函数创建GetElementPtr指令
    LLVMValueRef gepInstruction = LLVMBuildGEP(builder, pointerValue, indices, 2, "gep");

    // 打印创建的GetElementPtr指令
    LLVMDumpValue(gepInstruction);

    LLVMDisposeBuilder(builder);
    LLVMDisposeModule(module);

    return 0;
}