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const std = @import("std");
const parse = @import("parser.zig");
const symb = @import("symtable.zig");
const llvm = @import("llvm");
const analysis = llvm.analysis;
const core = llvm.core;
const target = llvm.target;
const types = llvm.types;
const CodegenError = error{
OutOfMemory,
};
fn toLLVMtype(typ: parse.TypeIdent, sym: *symb.SymbolTable) types.LLVMTypeRef {
if (sym.getType(typ)) |t| {
return switch (t) {
.Integer => core.LLVMInt32Type(),
.Void => core.LLVMVoidType(),
else => core.LLVMVoidType(),
};
}
return core.LLVMVoidType();
}
pub const Generator = struct {
root: parse.NodeStmt,
allocator: std.mem.Allocator,
builder: types.LLVMBuilderRef,
context: types.LLVMContextRef,
module: types.LLVMModuleRef,
currentFunc: ?types.LLVMValueRef,
currentFuncIsVoid: bool,
pub fn init(allocator: std.mem.Allocator, root: parse.NodeStmt) Generator {
_ = target.LLVMInitializeNativeTarget();
_ = target.LLVMInitializeNativeAsmPrinter();
_ = target.LLVMInitializeNativeAsmParser();
const context = core.LLVMContextCreate();
const builder = core.LLVMCreateBuilderInContext(context);
const module = core.LLVMModuleCreateWithNameInContext("_calico_start", context);
return .{
.root = root,
.allocator = allocator,
.builder = builder,
.context = context,
.module = module,
.currentFunc = null,
.currentFuncIsVoid = false,
};
}
pub fn deinit(self: *Generator) void {
// Shutdown LLVM
defer core.LLVMShutdown();
defer core.LLVMDisposeModule(self.module);
defer core.LLVMDisposeBuilder(self.builder);
//self.code.deinit();
}
fn genExit(self: *Generator, exit: parse.NodeExit) !void {
const expr = exit;
const val = core.LLVMConstInt(core.LLVMInt32Type(), switch (expr.kind) {
.intLit => |i| @intCast(i.intLit),
.ident => unreachable,
}, 0);
_ = core.LLVMBuildRet(self.builder, val);
}
fn genVar(self: *Generator, value: parse.NodeVar) !void {
const str = try std.fmt.allocPrint(self.allocator,
\\section .data
\\ {s}: dw {d}
\\
, .{ value.ident.ident, switch (value.expr.kind) {
.intLit => |intlit| intlit.intLit,
else => return error.NotImplemented,
} });
defer self.allocator.free(str);
try self.code.insertSlice(0, str);
}
fn genValue(self: *Generator, value: parse.NodeValue) !void {
const str = try std.fmt.allocPrint(self.allocator,
\\section .data
\\ {s}: dw {d}
\\
, .{ value.ident.ident, switch (value.expr.kind) {
.intLit => |intlit| intlit.intLit,
else => return error.NotImplemented,
} });
defer self.allocator.free(str);
try self.code.insertSlice(0, str);
}
fn genAssign(self: *Generator, assign: parse.NodeAssign) !void {
const newCode =
switch (assign.expr.kind) {
.intLit => |intlit| try std.fmt.allocPrint(self.allocator,
\\ mov rax, {d}
\\ mov [{s}], rax
\\
, .{
intlit.intLit,
assign.ident.ident,
}),
.ident => |ident| try std.fmt.allocPrint(self.allocator,
\\ mov rax, [{s}]
\\ mov [{s}], rax
\\
, .{
ident.ident,
assign.ident.ident,
}),
};
try self.code.appendSlice(newCode);
self.allocator.free(newCode);
}
fn genBlock(self: *Generator, block: []const parse.NodeStmt) CodegenError!void {
for (block) |stmt| try self.genStmt(stmt);
}
fn genFunc(self: *Generator, stmt: parse.NodeStmt) !void {
const fun = stmt.kind.function;
const table = stmt.symtable;
const block = fun.block;
const codeSlice = block.kind.block;
const funcName: [*:0]const u8 = try self.allocator.dupeZ(u8, fun.ident.ident);
const retType = toLLVMtype(fun.retType.?, table);
var params = [0]types.LLVMTypeRef{};
const funcType = core.LLVMFunctionType(retType, @ptrCast(¶ms), 0, 0);
const func = core.LLVMAddFunction(self.module, funcName, funcType);
self.currentFunc = func;
self.currentFuncIsVoid = switch (table.getType(fun.retType.?).?) {
.Void => true,
else => false,
};
const function: types.LLVMValueRef = self.currentFunc.?;
const codeBlock = core.LLVMAppendBasicBlockInContext(self.context, function, "entry");
core.LLVMPositionBuilderAtEnd(self.builder, codeBlock);
const bodyTable = block.symtable;
_ = bodyTable;
//TODO: codegen for args
try self.genBlock(codeSlice);
_ = if (self.currentFuncIsVoid) core.LLVMBuildRetVoid(self.builder);
}
fn genStmt(self: *Generator, stmt: parse.NodeStmt) !void {
try switch (stmt.kind) {
.exit => |expr| self.genExit(expr),
.function => self.genFunc(stmt),
else => {},
};
}
pub fn generate(self: *Generator) ![]const u8 {
try switch (self.root.kind) {
.block => |b| {
for (b) |stmt|
try self.genStmt(stmt);
},
else => error.InvalidTop,
};
const string: []const u8 = std.mem.span(core.LLVMPrintModuleToString(self.module));
return string;
}
};
test "Codegen exit" {
const tok = @import("tokenize.zig");
const expect = std.testing.expect;
const main = @import("main.zig");
const src =
\\fn main() -> i32 {
\\ return 7;
\\}
;
const expected =
\\; ModuleID = '_calico_start'
\\source_filename = "_calico_start"
\\
\\define i32 @main() {
\\entry:
\\ ret i32 7
\\}
\\
;
var tokenizer = tok.Tokenizer.init(std.testing.allocator, src);
defer tokenizer.deinit();
const toks = try tokenizer.tokenize();
var symbTable: *symb.SymbolTable = try main.initSymbolTable(std.testing.allocator);
defer symbTable.deinit();
var parser = parse.Parser.init(std.testing.allocator, toks, symbTable);
defer parser.deinit();
const parseTree = try parser.parse();
var pop = symb.Populator.init(std.testing.allocator);
var treeNode = parseTree.asNode();
try pop.populateSymtable(&treeNode);
var gen = Generator.init(std.testing.allocator, parseTree);
defer gen.deinit();
const actual = try gen.generate();
try expect(std.mem.eql(u8, actual, expected));
}
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