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const std = @import("std");
const parser = @import("parser.zig");
const llvm = @import("llvm");
const target_m = llvm.target_machine;
const target = llvm.target;
const types = llvm.types;
const core = llvm.core;
pub const CodeGenError = error{
CompilationError,
OutOfMemory,
};
pub const CodeGen = struct {
llvm_module: types.LLVMModuleRef,
builder: types.LLVMBuilderRef,
arena: std.mem.Allocator,
pub fn init(arena: std.mem.Allocator) !*CodeGen {
// Initialize LLVM
_ = target.LLVMInitializeNativeTarget();
_ = target.LLVMInitializeNativeAsmPrinter();
_ = target.LLVMInitializeNativeAsmParser();
const module: types.LLVMModuleRef = core.LLVMModuleCreateWithName("module");
const builder = core.LLVMCreateBuilder();
const self = try arena.create(CodeGen);
self.* = .{
.llvm_module = module,
.builder = builder,
.arena = arena,
};
return self;
}
pub fn deinit(self: *CodeGen) !void {
try self.create_entrypoint();
// Dump module
core.LLVMDumpModule(self.llvm_module);
// Generate code
const triple = target_m.LLVMGetDefaultTargetTriple();
var target_ref: types.LLVMTargetRef = undefined;
_ = target_m.LLVMGetTargetFromTriple(triple, &target_ref, null);
const target_machine = target_m.LLVMCreateTargetMachine(
target_ref,
triple,
"",
"",
types.LLVMCodeGenOptLevel.LLVMCodeGenLevelDefault,
types.LLVMRelocMode.LLVMRelocDefault,
types.LLVMCodeModel.LLVMCodeModelDefault,
);
// Generate the object file
const filename = "output.o";
_ = target_m.LLVMTargetMachineEmitToFile(
target_machine,
self.llvm_module,
filename,
types.LLVMCodeGenFileType.LLVMObjectFile,
null,
);
std.debug.print("Object file generated: {s}\n", .{filename});
// Clean up LLVM resources
defer core.LLVMDisposeBuilder(self.builder);
core.LLVMDisposeModule(self.llvm_module);
core.LLVMShutdown();
}
pub fn generate(self: *CodeGen, ast: *parser.Node) CodeGenError!void {
std.debug.assert(ast.* == parser.Node.PROGRAM);
const program = ast.PROGRAM;
for (program.statements) |stmt| {
_ = try self.generate_statement(stmt);
}
}
fn generate_statement(self: *CodeGen, statement: *parser.Node) CodeGenError!void {
std.debug.assert(statement.* == parser.Node.STATEMENT);
switch (statement.STATEMENT.statement.*) {
.ASSIGNMENT_STATEMENT => |*assignment_statement| {
try self.generate_assignment_statement(@ptrCast(assignment_statement));
return;
},
// .FUNCTION_CALL_STATEMENT => |*function_call_statement| {
// _ = try self.generate_function_call_statement(@ptrCast(function_call_statement));
// return null;
// },
.RETURN_STATEMENT => |*return_statement| return try self.generate_return_statement(@ptrCast(return_statement)),
else => unreachable,
}
}
fn generate_assignment_statement(self: *CodeGen, statement: *parser.Node) CodeGenError!void {
std.debug.assert(statement.* == parser.Node.ASSIGNMENT_STATEMENT);
const assignment_statement = statement.ASSIGNMENT_STATEMENT;
//tmp
std.debug.assert(assignment_statement.is_declaration == true);
std.debug.assert(assignment_statement.expression.* == parser.Node.FUNCTION_DEFINITION);
const function_name = try std.fmt.allocPrintZ(self.arena, "{s}", .{assignment_statement.name});
const function_type = core.LLVMFunctionType(core.LLVMInt64Type(), &[_]types.LLVMTypeRef{}, 0, 0) orelse return CodeGenError.CompilationError;
const function = core.LLVMAddFunction(self.llvm_module, function_name, function_type) orelse return CodeGenError.CompilationError;
const function_entry = core.LLVMAppendBasicBlock(function, "entrypoint") orelse return CodeGenError.CompilationError;
core.LLVMPositionBuilderAtEnd(self.builder, function_entry);
//tmp
std.debug.assert(assignment_statement.expression.* == parser.Node.FUNCTION_DEFINITION);
const function_defintion = assignment_statement.expression.FUNCTION_DEFINITION;
for (function_defintion.statements) |stmt| {
try self.generate_statement(stmt);
}
}
fn generate_return_statement(self: *CodeGen, statement: *parser.Node) !void {
std.debug.assert(statement.* == parser.Node.RETURN_STATEMENT);
const expression = statement.RETURN_STATEMENT.expression;
std.debug.assert(expression.* == parser.Node.PRIMARY_EXPRESSION);
const primary_expr = expression.PRIMARY_EXPRESSION.NUMBER.value;
// std.debug.assert(primary_expr == parser.Node.PRIMARY_EXPRESSION.NUMBER);
_ = core.LLVMBuildRet(self.builder, core.LLVMConstInt(core.LLVMInt64Type(), @intCast(primary_expr), 0));
}
pub fn create_entrypoint(self: *CodeGen) CodeGenError!void {
const start_function_type = core.LLVMFunctionType(core.LLVMInt8Type(), &[_]types.LLVMTypeRef{}, 0, 0) orelse return CodeGenError.CompilationError;
const start_function = core.LLVMAddFunction(self.llvm_module, "_start", start_function_type) orelse return CodeGenError.CompilationError;
const start_function_entry = core.LLVMAppendBasicBlock(start_function, "entrypoint") orelse return CodeGenError.CompilationError;
core.LLVMPositionBuilderAtEnd(self.builder, start_function_entry);
const main_function_type = core.LLVMFunctionType(core.LLVMInt8Type(), &[_]types.LLVMTypeRef{}, 0, 0) orelse return CodeGenError.CompilationError;
const main_function = core.LLVMGetNamedFunction(self.llvm_module, "main") orelse return CodeGenError.CompilationError;
const main_function_return = core.LLVMBuildCall2(self.builder, main_function_type, main_function, &[_]types.LLVMTypeRef{}, 0, "main_call") orelse return CodeGenError.CompilationError;
const exit_func_type = core.LLVMFunctionType(core.LLVMInt8Type(), @constCast(&[_]types.LLVMTypeRef{core.LLVMInt8Type()}), 1, 0);
const exit_func = core.LLVMAddFunction(self.llvm_module, "exit", exit_func_type);
const exit_func_return = core.LLVMBuildCall2(self.builder, exit_func_type, exit_func, @constCast(&[_]types.LLVMValueRef{main_function_return}), 1, "exit_call");
_ = core.LLVMBuildRet(self.builder, exit_func_return);
}
pub fn generate_poc(self: *CodeGen) void {
const main_func_type = core.LLVMFunctionType(core.LLVMInt32Type(), null, 0, 0);
const main_func = core.LLVMAddFunction(self.llvm_module, "_start", main_func_type);
const main_entry = core.LLVMAppendBasicBlock(main_func, "entrypoint");
core.LLVMPositionBuilderAtEnd(self.builder, main_entry);
const format_str = "Hello, World!\n";
const format_str_ptr = core.LLVMBuildGlobalStringPtr(self.builder, format_str, "format_str_ptr");
var print_function_params = [_]types.LLVMTypeRef{
core.LLVMPointerType(core.LLVMInt8Type(), 0),
};
const print_func_type = core.LLVMFunctionType(core.LLVMVoidType(), &print_function_params, print_function_params.len, 0);
const print_func = core.LLVMAddFunction(self.llvm_module, "printf", print_func_type);
var print_func_args = [_]types.LLVMValueRef{
format_str_ptr,
};
_ = core.LLVMBuildCall2(self.builder, print_func_type, print_func, &print_func_args, print_func_args.len, "print_call");
var exit_func_params = [_]types.LLVMTypeRef{
core.LLVMInt32Type(),
};
const exit_func_type = core.LLVMFunctionType(core.LLVMInt32Type(), &exit_func_params, exit_func_params.len, 0);
const exit_func = core.LLVMAddFunction(self.llvm_module, "exit", exit_func_type);
var exit_func_args = [_]types.LLVMValueRef{
core.LLVMConstInt(core.LLVMInt32Type(), 7, 0),
};
const exit_func_ret = core.LLVMBuildCall2(self.builder, exit_func_type, exit_func, &exit_func_args, exit_func_args.len, "exit_call");
_ = core.LLVMBuildRet(self.builder, exit_func_ret);
}
};
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