/
translate_c.zig
677 lines (607 loc) · 23.9 KB
/
translate_c.zig
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// This is the userland implementation of translate-c which will be used by both stage1
// and stage2. Currently the only way it is used is with `zig translate-c-2`.
const std = @import("std");
const builtin = @import("builtin");
const assert = std.debug.assert;
const ast = std.zig.ast;
const Token = std.zig.Token;
usingnamespace @import("clang.zig");
pub const Mode = enum {
import,
translate,
};
// TODO merge with Type.Fn.CallingConvention
const CallingConvention = builtin.TypeInfo.CallingConvention;
pub const ClangErrMsg = Stage2ErrorMsg;
pub const Error = error{OutOfMemory};
const TypeError = Error || error{UnsupportedType};
const TransError = Error || error{UnsupportedTranslation};
const DeclTable = std.HashMap(usize, void, addrHash, addrEql);
fn addrHash(x: usize) u32 {
switch (@typeInfo(usize).Int.bits) {
32 => return x,
// pointers are usually aligned so we ignore the bits that are probably all 0 anyway
// usually the larger bits of addr space are unused so we just chop em off
64 => return @truncate(u32, x >> 4),
else => @compileError("unreachable"),
}
}
fn addrEql(a: usize, b: usize) bool {
return a == b;
}
const Scope = struct {
id: Id,
parent: ?*Scope,
const Id = enum {
Switch,
Var,
Block,
Root,
While,
};
const Switch = struct {
base: Scope,
};
const Var = struct {
base: Scope,
c_name: []const u8,
zig_name: []const u8,
};
const Block = struct {
base: Scope,
block_node: *ast.Node.Block,
/// Don't forget to set rbrace token later
fn create(c: *Context, parent: *Scope, lbrace_tok: ast.TokenIndex) !*Block {
const block = try c.a().create(Block);
block.* = Block{
.base = Scope{
.id = Id.Block,
.parent = parent,
},
.block_node = try c.a().create(ast.Node.Block),
};
block.block_node.* = ast.Node.Block{
.base = ast.Node{ .id = ast.Node.Id.Block },
.label = null,
.lbrace = lbrace_tok,
.statements = ast.Node.Block.StatementList.init(c.a()),
.rbrace = undefined,
};
return block;
}
};
const Root = struct {
base: Scope,
};
const While = struct {
base: Scope,
};
};
const TransResult = struct {
node: *ast.Node,
node_scope: *Scope,
child_scope: *Scope,
};
const Context = struct {
tree: *ast.Tree,
source_buffer: *std.Buffer,
err: Error,
source_manager: *ZigClangSourceManager,
decl_table: DeclTable,
global_scope: *Scope.Root,
mode: Mode,
fn a(c: *Context) *std.mem.Allocator {
return &c.tree.arena_allocator.allocator;
}
/// Convert a null-terminated C string to a slice allocated in the arena
fn str(c: *Context, s: [*]const u8) ![]u8 {
return std.mem.dupe(c.a(), u8, std.mem.toSliceConst(u8, s));
}
/// Convert a clang source location to a file:line:column string
fn locStr(c: *Context, loc: ZigClangSourceLocation) ![]u8 {
const spelling_loc = ZigClangSourceManager_getSpellingLoc(c.source_manager, loc);
const filename_c = ZigClangSourceManager_getFilename(c.source_manager, spelling_loc);
const filename = if (filename_c) |s| try c.str(s) else ([]const u8)("(no file)");
const line = ZigClangSourceManager_getSpellingLineNumber(c.source_manager, spelling_loc);
const column = ZigClangSourceManager_getSpellingColumnNumber(c.source_manager, spelling_loc);
return std.fmt.allocPrint(c.a(), "{}:{}:{}", filename, line, column);
}
};
pub fn translate(
backing_allocator: *std.mem.Allocator,
args_begin: [*]?[*]const u8,
args_end: [*]?[*]const u8,
mode: Mode,
errors: *[]ClangErrMsg,
resources_path: [*]const u8,
) !*ast.Tree {
const ast_unit = ZigClangLoadFromCommandLine(
args_begin,
args_end,
&errors.ptr,
&errors.len,
resources_path,
) orelse {
if (errors.len == 0) return error.OutOfMemory;
return error.SemanticAnalyzeFail;
};
defer ZigClangASTUnit_delete(ast_unit);
var tree_arena = std.heap.ArenaAllocator.init(backing_allocator);
errdefer tree_arena.deinit();
const tree = try tree_arena.allocator.create(ast.Tree);
tree.* = ast.Tree{
.source = undefined, // need to use Buffer.toOwnedSlice later
.root_node = undefined,
.arena_allocator = tree_arena,
.tokens = undefined, // can't reference the allocator yet
.errors = undefined, // can't reference the allocator yet
};
const arena = &tree.arena_allocator.allocator; // now we can reference the allocator
tree.tokens = ast.Tree.TokenList.init(arena);
tree.errors = ast.Tree.ErrorList.init(arena);
tree.root_node = try arena.create(ast.Node.Root);
tree.root_node.* = ast.Node.Root{
.base = ast.Node{ .id = ast.Node.Id.Root },
.decls = ast.Node.Root.DeclList.init(arena),
.doc_comments = null,
// initialized with the eof token at the end
.eof_token = undefined,
};
var source_buffer = try std.Buffer.initSize(arena, 0);
var context = Context{
.tree = tree,
.source_buffer = &source_buffer,
.source_manager = ZigClangASTUnit_getSourceManager(ast_unit),
.err = undefined,
.decl_table = DeclTable.init(arena),
.global_scope = try arena.create(Scope.Root),
.mode = mode,
};
context.global_scope.* = Scope.Root{
.base = Scope{
.id = Scope.Id.Root,
.parent = null,
},
};
if (!ZigClangASTUnit_visitLocalTopLevelDecls(ast_unit, &context, declVisitorC)) {
return context.err;
}
_ = try appendToken(&context, .Eof, "");
tree.source = source_buffer.toOwnedSlice();
if (false) {
std.debug.warn("debug source:\n{}\n==EOF==\ntokens:\n", tree.source);
var i: usize = 0;
while (i < tree.tokens.len) : (i += 1) {
const token = tree.tokens.at(i);
std.debug.warn("{}\n", token);
}
}
return tree;
}
extern fn declVisitorC(context: ?*c_void, decl: *const ZigClangDecl) bool {
const c = @ptrCast(*Context, @alignCast(@alignOf(Context), context));
declVisitor(c, decl) catch |err| {
c.err = err;
return false;
};
return true;
}
fn declVisitor(c: *Context, decl: *const ZigClangDecl) Error!void {
switch (ZigClangDecl_getKind(decl)) {
.Function => {
return visitFnDecl(c, @ptrCast(*const ZigClangFunctionDecl, decl));
},
.Typedef => {
try emitWarning(c, ZigClangDecl_getLocation(decl), "TODO implement translate-c for typedefs");
},
.Enum => {
try emitWarning(c, ZigClangDecl_getLocation(decl), "TODO implement translate-c for enums");
},
.Record => {
try emitWarning(c, ZigClangDecl_getLocation(decl), "TODO implement translate-c for structs");
},
.Var => {
try emitWarning(c, ZigClangDecl_getLocation(decl), "TODO implement translate-c for variables");
},
else => {
const decl_name = try c.str(ZigClangDecl_getDeclKindName(decl));
try emitWarning(c, ZigClangDecl_getLocation(decl), "ignoring {} declaration", decl_name);
},
}
}
fn visitFnDecl(c: *Context, fn_decl: *const ZigClangFunctionDecl) Error!void {
if (try c.decl_table.put(@ptrToInt(fn_decl), {})) |_| return; // Avoid processing this decl twice
const rp = makeRestorePoint(c);
const fn_name = try c.str(ZigClangDecl_getName_bytes_begin(@ptrCast(*const ZigClangDecl, fn_decl)));
const fn_decl_loc = ZigClangFunctionDecl_getLocation(fn_decl);
const fn_qt = ZigClangFunctionDecl_getType(fn_decl);
const fn_type = ZigClangQualType_getTypePtr(fn_qt);
var scope = &c.global_scope.base;
const has_body = ZigClangFunctionDecl_hasBody(fn_decl);
const storage_class = ZigClangFunctionDecl_getStorageClass(fn_decl);
const decl_ctx = FnDeclContext{
.fn_name = fn_name,
.has_body = has_body,
.storage_class = storage_class,
.scope = &scope,
.is_export = switch (storage_class) {
.None => has_body,
.Extern, .Static => false,
.PrivateExtern => return failDecl(c, fn_decl_loc, fn_name, "unsupported storage class: private extern"),
.Auto => unreachable, // Not legal on functions
.Register => unreachable, // Not legal on functions
},
};
const proto_node = switch (ZigClangType_getTypeClass(fn_type)) {
.FunctionProto => blk: {
const fn_proto_type = @ptrCast(*const ZigClangFunctionProtoType, fn_type);
break :blk transFnProto(rp, fn_proto_type, fn_decl_loc, decl_ctx) catch |err| switch (err) {
error.UnsupportedType => {
return failDecl(c, fn_decl_loc, fn_name, "unable to resolve prototype of function");
},
error.OutOfMemory => |e| return e,
};
},
.FunctionNoProto => blk: {
const fn_no_proto_type = @ptrCast(*const ZigClangFunctionType, fn_type);
break :blk transFnNoProto(rp, fn_no_proto_type, fn_decl_loc, decl_ctx) catch |err| switch (err) {
error.UnsupportedType => {
return failDecl(c, fn_decl_loc, fn_name, "unable to resolve prototype of function");
},
error.OutOfMemory => |e| return e,
};
},
else => unreachable,
};
if (!decl_ctx.has_body) {
const semi_tok = try appendToken(c, .Semicolon, ";");
return addTopLevelDecl(c, fn_name, &proto_node.base);
}
// actual function definition with body
const body_stmt = ZigClangFunctionDecl_getBody(fn_decl);
const result = transStmt(rp, scope, body_stmt, .unused, .r_value) catch |err| switch (err) {
error.OutOfMemory => |e| return e,
error.UnsupportedTranslation => return failDecl(c, fn_decl_loc, fn_name, "unable to translate function"),
};
assert(result.node.id == ast.Node.Id.Block);
proto_node.body_node = result.node;
return addTopLevelDecl(c, fn_name, &proto_node.base);
}
const ResultUsed = enum {
used,
unused,
};
const LRValue = enum {
l_value,
r_value,
};
fn transStmt(
rp: RestorePoint,
scope: *Scope,
stmt: *const ZigClangStmt,
result_used: ResultUsed,
lrvalue: LRValue,
) !TransResult {
const sc = ZigClangStmt_getStmtClass(stmt);
switch (sc) {
.CompoundStmtClass => return transCompoundStmt(rp, scope, @ptrCast(*const ZigClangCompoundStmt, stmt)),
else => {
return revertAndWarn(
rp,
error.UnsupportedTranslation,
ZigClangStmt_getBeginLoc(stmt),
"TODO implement translation of stmt class {}",
@tagName(sc),
);
},
}
}
fn transCompoundStmtInline(
rp: RestorePoint,
parent_scope: *Scope,
stmt: *const ZigClangCompoundStmt,
block_node: *ast.Node.Block,
) TransError!TransResult {
var it = ZigClangCompoundStmt_body_begin(stmt);
const end_it = ZigClangCompoundStmt_body_end(stmt);
var scope = parent_scope;
while (it != end_it) : (it += 1) {
const result = try transStmt(rp, scope, it.*, .unused, .r_value);
scope = result.child_scope;
try block_node.statements.push(result.node);
}
return TransResult{
.node = &block_node.base,
.child_scope = scope,
.node_scope = scope,
};
}
fn transCompoundStmt(rp: RestorePoint, scope: *Scope, stmt: *const ZigClangCompoundStmt) !TransResult {
const lbrace_tok = try appendToken(rp.c, .LBrace, "{");
const block_scope = try Scope.Block.create(rp.c, scope, lbrace_tok);
const inline_result = try transCompoundStmtInline(rp, &block_scope.base, stmt, block_scope.block_node);
block_scope.block_node.rbrace = try appendToken(rp.c, .RBrace, "}");
return TransResult{
.node = &block_scope.block_node.base,
.node_scope = inline_result.node_scope,
.child_scope = inline_result.child_scope,
};
}
fn addTopLevelDecl(c: *Context, name: []const u8, decl_node: *ast.Node) !void {
try c.tree.root_node.decls.push(decl_node);
}
fn transQualType(rp: RestorePoint, qt: ZigClangQualType, source_loc: ZigClangSourceLocation) TypeError!*ast.Node {
return transType(rp, ZigClangQualType_getTypePtr(qt), source_loc);
}
fn qualTypeCanon(qt: ZigClangQualType) *const ZigClangType {
const canon = ZigClangQualType_getCanonicalType(qt);
return ZigClangQualType_getTypePtr(canon);
}
const RestorePoint = struct {
c: *Context,
token_index: ast.TokenIndex,
src_buf_index: usize,
fn activate(self: RestorePoint) void {
self.c.tree.tokens.shrink(self.token_index);
self.c.source_buffer.shrink(self.src_buf_index);
}
};
fn makeRestorePoint(c: *Context) RestorePoint {
return RestorePoint{
.c = c,
.token_index = c.tree.tokens.len,
.src_buf_index = c.source_buffer.len(),
};
}
fn transType(rp: RestorePoint, ty: *const ZigClangType, source_loc: ZigClangSourceLocation) TypeError!*ast.Node {
switch (ZigClangType_getTypeClass(ty)) {
.Builtin => {
const builtin_ty = @ptrCast(*const ZigClangBuiltinType, ty);
switch (ZigClangBuiltinType_getKind(builtin_ty)) {
.Void => return appendIdentifier(rp.c, "c_void"),
.Bool => return appendIdentifier(rp.c, "bool"),
.Char_U, .UChar, .Char_S, .Char8 => return appendIdentifier(rp.c, "u8"),
.SChar => return appendIdentifier(rp.c, "i8"),
.UShort => return appendIdentifier(rp.c, "c_ushort"),
.UInt => return appendIdentifier(rp.c, "c_uint"),
.ULong => return appendIdentifier(rp.c, "c_ulong"),
.ULongLong => return appendIdentifier(rp.c, "c_ulonglong"),
.Short => return appendIdentifier(rp.c, "c_short"),
.Int => return appendIdentifier(rp.c, "c_int"),
.Long => return appendIdentifier(rp.c, "c_long"),
.LongLong => return appendIdentifier(rp.c, "c_longlong"),
.UInt128 => return appendIdentifier(rp.c, "u128"),
.Int128 => return appendIdentifier(rp.c, "i128"),
.Float => return appendIdentifier(rp.c, "f32"),
.Double => return appendIdentifier(rp.c, "f64"),
.Float128 => return appendIdentifier(rp.c, "f128"),
.Float16 => return appendIdentifier(rp.c, "f16"),
.LongDouble => return appendIdentifier(rp.c, "c_longdouble"),
else => return revertAndWarn(rp, error.UnsupportedType, source_loc, "unsupported builtin type"),
}
},
.FunctionProto => {
const fn_proto_ty = @ptrCast(*const ZigClangFunctionProtoType, ty);
const fn_proto = try transFnProto(rp, fn_proto_ty, source_loc, null);
return &fn_proto.base;
},
else => {
const type_name = rp.c.str(ZigClangType_getTypeClassName(ty));
return revertAndWarn(rp, error.UnsupportedType, source_loc, "unsupported type: '{}'", type_name);
},
}
}
const FnDeclContext = struct {
fn_name: []const u8,
has_body: bool,
storage_class: ZigClangStorageClass,
scope: **Scope,
is_export: bool,
};
fn transCC(
rp: RestorePoint,
fn_ty: *const ZigClangFunctionType,
source_loc: ZigClangSourceLocation,
) !CallingConvention {
const clang_cc = ZigClangFunctionType_getCallConv(fn_ty);
switch (clang_cc) {
.C => return CallingConvention.C,
.X86StdCall => return CallingConvention.Stdcall,
else => return revertAndWarn(rp, error.UnsupportedType, source_loc, "unsupported calling convention: {}", @tagName(clang_cc)),
}
}
fn transFnProto(
rp: RestorePoint,
fn_proto_ty: *const ZigClangFunctionProtoType,
source_loc: ZigClangSourceLocation,
fn_decl_context: ?FnDeclContext,
) !*ast.Node.FnProto {
const fn_ty = @ptrCast(*const ZigClangFunctionType, fn_proto_ty);
const cc = try transCC(rp, fn_ty, source_loc);
const is_var_args = ZigClangFunctionProtoType_isVariadic(fn_proto_ty);
const param_count: usize = ZigClangFunctionProtoType_getNumParams(fn_proto_ty);
var i: usize = 0;
while (i < param_count) : (i += 1) {
return revertAndWarn(rp, error.UnsupportedType, source_loc, "TODO: implement parameters for FunctionProto in transType");
}
return finishTransFnProto(rp, fn_ty, source_loc, fn_decl_context, is_var_args, cc);
}
fn transFnNoProto(
rp: RestorePoint,
fn_ty: *const ZigClangFunctionType,
source_loc: ZigClangSourceLocation,
fn_decl_context: ?FnDeclContext,
) !*ast.Node.FnProto {
const cc = try transCC(rp, fn_ty, source_loc);
const is_var_args = if (fn_decl_context) |ctx| !ctx.is_export else true;
return finishTransFnProto(rp, fn_ty, source_loc, fn_decl_context, is_var_args, cc);
}
fn finishTransFnProto(
rp: RestorePoint,
fn_ty: *const ZigClangFunctionType,
source_loc: ZigClangSourceLocation,
fn_decl_context: ?FnDeclContext,
is_var_args: bool,
cc: CallingConvention,
) !*ast.Node.FnProto {
const is_export = if (fn_decl_context) |ctx| ctx.is_export else false;
// TODO check for always_inline attribute
// TODO check for align attribute
// pub extern fn name(...) T
const pub_tok = try appendToken(rp.c, .Keyword_pub, "pub");
const cc_tok = if (cc == .Stdcall) try appendToken(rp.c, .Keyword_stdcallcc, "stdcallcc") else null;
const extern_export_inline_tok = if (is_export)
try appendToken(rp.c, .Keyword_export, "export")
else if (cc == .C)
try appendToken(rp.c, .Keyword_extern, "extern")
else
null;
const fn_tok = try appendToken(rp.c, .Keyword_fn, "fn");
const name_tok = if (fn_decl_context) |ctx| try appendToken(rp.c, .Identifier, ctx.fn_name) else null;
const lparen_tok = try appendToken(rp.c, .LParen, "(");
const var_args_tok = if (is_var_args) try appendToken(rp.c, .Ellipsis3, "...") else null;
const rparen_tok = try appendToken(rp.c, .RParen, ")");
const return_type_node = blk: {
if (ZigClangFunctionType_getNoReturnAttr(fn_ty)) {
break :blk try appendIdentifier(rp.c, "noreturn");
} else {
const return_qt = ZigClangFunctionType_getReturnType(fn_ty);
if (ZigClangType_isVoidType(qualTypeCanon(return_qt))) {
break :blk try appendIdentifier(rp.c, "void");
} else {
break :blk transQualType(rp, return_qt, source_loc) catch |err| switch (err) {
error.UnsupportedType => {
try emitWarning(rp.c, source_loc, "unsupported function proto return type");
return err;
},
error.OutOfMemory => |e| return e,
};
}
}
};
const fn_proto = try rp.c.a().create(ast.Node.FnProto);
fn_proto.* = ast.Node.FnProto{
.base = ast.Node{ .id = ast.Node.Id.FnProto },
.doc_comments = null,
.visib_token = pub_tok,
.fn_token = fn_tok,
.name_token = name_tok,
.params = ast.Node.FnProto.ParamList.init(rp.c.a()),
.return_type = ast.Node.FnProto.ReturnType{ .Explicit = return_type_node },
.var_args_token = null, // TODO this field is broken in the AST data model
.extern_export_inline_token = extern_export_inline_tok,
.cc_token = cc_tok,
.async_attr = null,
.body_node = null,
.lib_name = null,
.align_expr = null,
.section_expr = null,
};
if (is_var_args) {
const var_arg_node = try rp.c.a().create(ast.Node.ParamDecl);
var_arg_node.* = ast.Node.ParamDecl{
.base = ast.Node{ .id = ast.Node.Id.ParamDecl },
.doc_comments = null,
.comptime_token = null,
.noalias_token = null,
.name_token = null,
.type_node = undefined,
.var_args_token = var_args_tok,
};
try fn_proto.params.push(&var_arg_node.base);
}
return fn_proto;
}
fn revertAndWarn(
rp: RestorePoint,
err: var,
source_loc: ZigClangSourceLocation,
comptime format: []const u8,
args: ...,
) (@typeOf(err) || error{OutOfMemory}) {
rp.activate();
try emitWarning(rp.c, source_loc, format, args);
return err;
}
fn emitWarning(c: *Context, loc: ZigClangSourceLocation, comptime format: []const u8, args: ...) !void {
_ = try appendTokenFmt(c, .LineComment, "// {}: warning: " ++ format, c.locStr(loc), args);
}
fn failDecl(c: *Context, loc: ZigClangSourceLocation, name: []const u8, comptime format: []const u8, args: ...) !void {
// const name = @compileError(msg);
const const_tok = try appendToken(c, .Keyword_const, "const");
const name_tok = try appendToken(c, .Identifier, name);
const eq_tok = try appendToken(c, .Equal, "=");
const builtin_tok = try appendToken(c, .Builtin, "@compileError");
const lparen_tok = try appendToken(c, .LParen, "(");
const msg_tok = try appendTokenFmt(c, .StringLiteral, "\"" ++ format ++ "\"", args);
const rparen_tok = try appendToken(c, .RParen, ")");
const semi_tok = try appendToken(c, .Semicolon, ";");
const msg_node = try c.a().create(ast.Node.StringLiteral);
msg_node.* = ast.Node.StringLiteral{
.base = ast.Node{ .id = ast.Node.Id.StringLiteral },
.token = msg_tok,
};
const call_node = try c.a().create(ast.Node.BuiltinCall);
call_node.* = ast.Node.BuiltinCall{
.base = ast.Node{ .id = ast.Node.Id.BuiltinCall },
.builtin_token = builtin_tok,
.params = ast.Node.BuiltinCall.ParamList.init(c.a()),
.rparen_token = rparen_tok,
};
try call_node.params.push(&msg_node.base);
const var_decl_node = try c.a().create(ast.Node.VarDecl);
var_decl_node.* = ast.Node.VarDecl{
.base = ast.Node{ .id = ast.Node.Id.VarDecl },
.doc_comments = null,
.visib_token = null,
.thread_local_token = null,
.name_token = name_tok,
.eq_token = eq_tok,
.mut_token = const_tok,
.comptime_token = null,
.extern_export_token = null,
.lib_name = null,
.type_node = null,
.align_node = null,
.section_node = null,
.init_node = &call_node.base,
.semicolon_token = semi_tok,
};
try c.tree.root_node.decls.push(&var_decl_node.base);
}
fn appendToken(c: *Context, token_id: Token.Id, bytes: []const u8) !ast.TokenIndex {
return appendTokenFmt(c, token_id, "{}", bytes);
}
fn appendTokenFmt(c: *Context, token_id: Token.Id, comptime format: []const u8, args: ...) !ast.TokenIndex {
const S = struct {
fn callback(context: *Context, bytes: []const u8) error{OutOfMemory}!void {
return context.source_buffer.append(bytes);
}
};
const start_index = c.source_buffer.len();
errdefer c.source_buffer.shrink(start_index);
try std.fmt.format(c, error{OutOfMemory}, S.callback, format, args);
const end_index = c.source_buffer.len();
const token_index = c.tree.tokens.len;
const new_token = try c.tree.tokens.addOne();
errdefer c.tree.tokens.shrink(token_index);
new_token.* = Token{
.id = token_id,
.start = start_index,
.end = end_index,
};
try c.source_buffer.appendByte('\n');
return token_index;
}
fn appendIdentifier(c: *Context, name: []const u8) !*ast.Node {
const token_index = try appendToken(c, .Identifier, name);
const identifier = try c.a().create(ast.Node.Identifier);
identifier.* = ast.Node.Identifier{
.base = ast.Node{ .id = ast.Node.Id.Identifier },
.token = token_index,
};
return &identifier.base;
}
pub fn freeErrors(errors: []ClangErrMsg) void {
ZigClangErrorMsg_delete(errors.ptr, errors.len);
}