1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
|
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,
};
const Variable = struct {
type: types.LLVMTypeRef,
value: types.LLVMValueRef,
};
pub const CodeGen = struct {
llvm_module: types.LLVMModuleRef,
builder: types.LLVMBuilderRef,
symbol_table: std.StringHashMap(*Variable), //TODO: Scopes, also add functions here
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,
.symbol_table = std.StringHashMap(*Variable).init(arena),
.arena = arena,
};
const printf_function_type = core.LLVMFunctionType(core.LLVMVoidType(), @constCast(&[_]types.LLVMTypeRef{
core.LLVMPointerType(core.LLVMInt8Type(), 0),
core.LLVMInt64Type(),
}), 2, 0);
const printf_function = core.LLVMAddFunction(self.llvm_module, "printf", printf_function_type) orelse return CodeGenError.CompilationError;
const print_function_type = core.LLVMFunctionType(core.LLVMVoidType(), @constCast(&[_]types.LLVMTypeRef{core.LLVMInt64Type()}), 1, 0);
const print_function = core.LLVMAddFunction(self.llvm_module, "print", print_function_type);
const print_function_entry = core.LLVMAppendBasicBlock(print_function, "entrypoint") orelse return CodeGenError.CompilationError;
core.LLVMPositionBuilderAtEnd(self.builder, print_function_entry);
const format_str = "%d\n";
const format_str_ptr = core.LLVMBuildGlobalStringPtr(self.builder, format_str, "format_str_ptr");
const arguments = @constCast(&[_]types.LLVMValueRef{
format_str_ptr,
core.LLVMGetParam(print_function, 0),
});
_ = core.LLVMBuildCall2(self.builder, printf_function_type, printf_function, arguments, 2, "printf_call") orelse return CodeGenError.CompilationError;
_ = core.LLVMBuildRetVoid(self.builder);
try self.symbol_table.put("print", try self.create_variable(.{
.value = print_function,
.type = print_function_type,
}));
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));
},
.FUNCTION_CALL_STATEMENT => |*function_call_statement| {
_ = try self.generate_function_call_statement(@ptrCast(function_call_statement));
},
.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
const variable_name = try std.fmt.allocPrintZ(self.arena, "{s}", .{assignment_statement.name});
switch (assignment_statement.expression.*) {
.FUNCTION_DEFINITION => {
const function_type = core.LLVMFunctionType(core.LLVMInt64Type(), &[_]types.LLVMTypeRef{}, 0, 0) orelse return CodeGenError.CompilationError;
const function = core.LLVMAddFunction(self.llvm_module, variable_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);
}
try self.symbol_table.put(variable_name, try self.create_variable(.{
.value = function,
.type = function_type,
}));
},
.PRIMARY_EXPRESSION => |exp| {
switch (exp) {
.NUMBER => {
var variable: types.LLVMValueRef = undefined;
if (self.symbol_table.get(variable_name)) |v| {
variable = v.value;
} else {
variable = core.LLVMBuildAlloca(self.builder, core.LLVMInt64Type(), variable_name) orelse return CodeGenError.CompilationError;
}
_ = core.LLVMBuildStore(self.builder, core.LLVMConstInt(core.LLVMInt64Type(), @intCast(exp.NUMBER.value), 0), variable) orelse return CodeGenError.CompilationError;
try self.symbol_table.put(variable_name, try self.create_variable(.{
.value = variable,
.type = core.LLVMInt64Type(),
}));
},
else => unreachable,
}
},
else => unreachable,
}
}
fn generate_function_call_statement(self: *CodeGen, statement: *parser.Node) !types.LLVMValueRef {
std.debug.assert(statement.* == parser.Node.FUNCTION_CALL_STATEMENT);
const function_call_statement = statement.FUNCTION_CALL_STATEMENT;
std.debug.assert(function_call_statement.expression.* == parser.Node.PRIMARY_EXPRESSION);
const primary_expression = function_call_statement.expression.PRIMARY_EXPRESSION;
std.debug.assert(primary_expression == .IDENTIFIER);
const ident = primary_expression.IDENTIFIER;
var arguments = std.ArrayList(types.LLVMValueRef).init(self.arena);
for (function_call_statement.arguments) |argument| {
const num_argument: types.LLVMValueRef = switch (argument.PRIMARY_EXPRESSION) {
.NUMBER => |n| core.LLVMConstInt(core.LLVMInt64Type(), @intCast(n.value), 0),
.IDENTIFIER => |i| core.LLVMBuildLoad2(self.builder, core.LLVMInt64Type(), self.symbol_table.get(i.name).?.value, "").?,
else => unreachable,
};
try arguments.append(num_argument);
}
const xd = self.symbol_table.get(ident.name) orelse return CodeGenError.CompilationError;
return core.LLVMBuildCall2(self.builder, xd.type, xd.value, @ptrCast(arguments.items), @intCast(arguments.items.len), "function_call") orelse return CodeGenError.CompilationError;
}
fn generate_return_statement(self: *CodeGen, statement: *parser.Node) !void {
std.debug.assert(statement.* == parser.Node.RETURN_STATEMENT);
const expression = statement.RETURN_STATEMENT.expression;
const num_argument: types.LLVMValueRef = switch (expression.*) {
.PRIMARY_EXPRESSION => |primary_expression| switch (primary_expression) {
.NUMBER => |n| core.LLVMConstInt(core.LLVMInt64Type(), @intCast(n.value), 0),
.IDENTIFIER => |i| core.LLVMBuildLoad2(self.builder, core.LLVMInt64Type(), self.symbol_table.get(i.name).?.value, "").?,
else => unreachable,
},
.FUNCTION_CALL_STATEMENT => |*fn_call| try self.generate_function_call_statement(@ptrCast(fn_call)),
else => unreachable,
};
_ = core.LLVMBuildRet(self.builder, num_argument);
}
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);
}
fn create_variable(self: *CodeGen, variable_value: Variable) !*Variable {
const variable = try self.arena.create(Variable);
variable.* = variable_value;
return variable;
}
};
|
