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parsing an extern fn declaration

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This commit is contained in:
Andrew Kelley 2017-12-09 20:50:31 -05:00
parent e9efa74333
commit 62ead3a2ee
1 changed files with 87 additions and 3 deletions
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90
src-self-hosted/main.zig
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@ -481,6 +481,7 @@ const NoAlias = enum { No, Yes };
const Extern = enum { No, Yes };
const VarArgs = enum { No, Yes };
const Mutability = enum { Const, Var };
const Volatile = enum { No, Yes };
const Inline = enum {
Auto,
@ -511,6 +512,7 @@ const AstNode = struct {
Identifier,
FnProto,
ParamDecl,
AddrOfExpr,
};
fn iterate(base: &AstNode, index: usize) -> ?&AstNode {
@ -520,6 +522,7 @@ const AstNode = struct {
Id.Identifier => @fieldParentPtr(AstNodeIdentifier, "base", base).iterate(index),
Id.FnProto => @fieldParentPtr(AstNodeFnProto, "base", base).iterate(index),
Id.ParamDecl => @fieldParentPtr(AstNodeParamDecl, "base", base).iterate(index),
Id.AddrOfExpr => @fieldParentPtr(AstNodeAddrOfExpr, "base", base).iterate(index),
};
}
};
@ -643,6 +646,31 @@ const AstNodeParamDecl = struct {
}
};
const AstNodeAddrOfExpr = struct {
base: AstNode,
align_expr: ?&AstNode,
op_token: Token,
bit_offset_start_token: ?Token,
bit_offset_end_token: ?Token,
const_token: ?Token,
volatile_token: ?Token,
op_expr: &AstNode,
fn iterate(self: &AstNodeAddrOfExpr, index: usize) -> ?&AstNode {
var i = index;
if (self.align_expr) |align_expr| {
if (i < 1) return align_expr;
i -= 1;
}
if (i < 1) return self.op_expr;
i -= 1;
return null;
}
};
error ParseError;
const Parser = struct {
@ -796,6 +824,7 @@ const Parser = struct {
},
Token.Id.Keyword_fn => {
stack.append(State.TopLevel) %% unreachable;
%return stack.append(State { .ExpectToken = Token.Id.Semicolon });
const fn_proto_node = %return self.createAttachFnProto(&root_node.decls, token,
Extern.Yes, CallingConvention.Auto, visib, Inline.Auto);
%return stack.append(State { .FnProto = fn_proto_node });
@ -806,6 +835,7 @@ const Parser = struct {
},
Token.Id.Keyword_coldcc, Token.Id.Keyword_nakedcc, Token.Id.Keyword_stdcallcc => {
stack.append(State.TopLevel) %% unreachable;
%return stack.append(State { .ExpectToken = Token.Id.Semicolon });
const cc = switch (token.id) {
Token.Id.Keyword_coldcc => CallingConvention.Cold,
Token.Id.Keyword_nakedcc => CallingConvention.Naked,
@ -904,7 +934,7 @@ const Parser = struct {
},
State.AdditionExpression => |result_ptr| {
stack.append(State {.AdditionExpression = result_ptr}) %% unreachable;
stack.append(State {.MultiplyExpression = result_ptr}) %% unreachable;
continue;
},
@ -919,6 +949,27 @@ const Parser = struct {
},
State.PrefixOpExpression => |result_ptr| {
const first_token = self.getNextToken();
if (first_token.id == Token.Id.Ampersand) {
const addr_of_expr = %return self.createAttachAddrOfExpr(result_ptr, first_token);
var token = self.getNextToken();
if (token.id == Token.Id.Keyword_align) {
@panic("TODO align");
}
if (token.id == Token.Id.Keyword_const) {
addr_of_expr.const_token = token;
token = self.getNextToken();
}
if (token.id == Token.Id.Keyword_volatile) {
addr_of_expr.volatile_token = token;
token = self.getNextToken();
}
self.putBackToken(token);
stack.append(State { .PrefixOpExpression = &addr_of_expr.op_expr }) %% unreachable;
continue;
}
self.putBackToken(first_token);
stack.append(State { .SuffixOpExpression = result_ptr }) %% unreachable;
continue;
},
@ -966,8 +1017,17 @@ const Parser = struct {
},
State.FnProtoAlign => |fn_proto| {
@panic("TODO fn proto align");
//continue;
const token = self.getNextToken();
if (token.id == Token.Id.Keyword_align) {
@panic("TODO fn proto align");
}
if (token.id == Token.Id.Arrow) {
stack.append(State { .TypeExpr = removeNullCast(&fn_proto.return_type) }) %% unreachable;
continue;
} else {
self.putBackToken(token);
continue;
}
},
State.ParamDecl => |fn_proto| {
@ -1107,6 +1167,30 @@ const Parser = struct {
return node;
}
fn createAddrOfExpr(self: &Parser, op_token: &const Token) -> %&AstNodeAddrOfExpr {
const node = %return self.allocator.create(AstNodeAddrOfExpr);
%defer self.allocator.destroy(node);
*node = AstNodeAddrOfExpr {
.base = AstNode {.id = AstNode.Id.AddrOfExpr},
.align_expr = null,
.op_token = *op_token,
.bit_offset_start_token = null,
.bit_offset_end_token = null,
.const_token = null,
.volatile_token = null,
.op_expr = undefined,
};
return node;
}
fn createAttachAddrOfExpr(self: &Parser, result_ptr: &&AstNode, op_token: &const Token) -> %&AstNodeAddrOfExpr {
const node = %return self.createAddrOfExpr(op_token);
%defer self.allocator.destroy(node);
*result_ptr = &node.base;
return node;
}
fn createAttachParamDecl(self: &Parser, list: &ArrayList(&AstNode)) -> %&AstNodeParamDecl {
const node = %return self.createParamDecl();
%defer self.allocator.destroy(node);