CHAT_LLVM.md

Apologies for the incomplete response. Here's the complete version of the generate_llvm_ir function:

#include <stdio.h>
#include <stdlib.h>

int var_counter = 0;

void generate_llvm_ir(ASTNode *node) {
    if (!node) return;

    generate_llvm_ir(node->left);
    generate_llvm_ir(node->right);

    switch (node->type) {
        case NODE_TYPE_INTEGER:
            printf("  %%x%d = add i32 0, %d\n", var_counter++, node->data.int_value);
            break;

        case NODE_TYPE_VARIABLE:
            printf("  %%x%d = load i32, i32* @%s\n", var_counter++, node->data.string_value);
            break;

        case NODE_TYPE_ADD_OP:
            if (node->data.op_type == OP_TYPE_ADD) {
                printf("  %%x%d = add i32 %%x%d, %%x%d\n", var_counter, var_counter - 2, var_counter - 1);
            } else if (node->data.op_type == OP_TYPE_SUB) {
                printf("  %%x%d = sub i32 %%x%d, %%x%d\n", var_counter, var_counter - 2, var_counter - 1);
            }
            var_counter++;
            break;

        case NODE_TYPE_ASSIGNMENT:
            printf("  store i32 %%x%d, i32* @%s\n", var_counter - 1, node->left->data.string_value);
            break;

        case NODE_TYPE_PRINT:
            printf("  call void @print_integer(i32 %%x%d)\n", var_counter - 1);
            break;

        case NODE_TYPE_STATEMENT_LIST:
            break;

        default:
            fprintf(stderr, "Unsupported node type: %d\n", node->type);
            exit(1);
    }
}

int main() {
    ASTNode *root = parse_program("some_input_program.txt");

    printf("; ModuleID = 'main'\n");
    printf("declare void @print_integer(i32)\n");
    printf("define i32 @main() {\n");

    generate_llvm_ir(root);

    printf("  ret i32 0\n");
    printf("}\n");

    return 0;
}

This code generates textual LLVM IR for the given AST. Note that you'll need to provide a proper implementation of the print_integer function in LLVM IR or link to an existing implementation when you compile the code. To compile the generated LLVM IR code to an executable, you can use the following command:

$ clang main.ll print_integer.c -o main

Replace main.ll with the LLVM IR code generated by your compiler and print_integer.c with the actual implementation of the print_integer function. This command will compile and link the LLVM IR code and the print_integer function to produce an executable named main.

This example demonstrates generating textual LLVM IR, but you can also use the LLVM C++ API or the LLVM C API (https://llvm.org/doxygen/group__LLVMC.html) to generate IR programmatically. Using the API allows for more control over the IR generation process and better integration with the rest of the LLVM infrastructure, such as optimization passes and target-specific code generation.