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add emitting of GetGlobal/GetGlobalLong

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This commit is contained in:
Luna 2019-06-02 23:43:12 -03:00
parent e3ac28d84e
commit 887cb1adea
2 changed files with 33 additions and 5 deletions
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2
src/chunk.zig
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@ -31,6 +31,8 @@ const AllOpcodes = struct {
pub DefineGlobal: u8 = 17,
pub DefineGlobalLong: u8 = 18,
pub GetGlobal: u8 = 19,
pub GetGlobalLong: u8 = 20,
};
pub const OpCode = AllOpcodes{};

36
src/compiler.zig
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@ -89,7 +89,7 @@ var rules = []ParseRule{
ParseRule{ .infix = Compiler.binary, .precedence = .Comparison },
ParseRule{ .infix = Compiler.binary, .precedence = .Comparison },
ParseRule{},
ParseRule{ .prefix = Compiler.variable },
ParseRule{ .prefix = Compiler.string },
ParseRule{ .prefix = Compiler.number },
ParseRule{ .precedence = .And },
@ -252,6 +252,19 @@ pub const Compiler = struct {
)));
}
fn namedVariable(self: *Compiler, tok: *Token) !void {
var idx = try self.identifierConstant(tok);
try self.emitConstWithIndex(
chunks.OpCode.GetGlobal,
chunks.OpCode.GetGlobalLong,
idx,
);
}
fn variable(self: *Compiler) !void {
try self.namedVariable(self.parser.previous);
}
/// Emits bytecode for a given unary.
fn unary(self: *Compiler) !void {
var ttype = self.parser.previous.ttype;
@ -368,11 +381,16 @@ pub const Compiler = struct {
return try self.identifierConstant(&self.parser.previous);
}
fn defineVariable(self: *Compiler, global: chunks.ConstantIndex) !void {
switch (global) {
.Small => |val| try self.emitBytes(chunks.OpCode.DefineGlobal, val),
fn emitConstWithIndex(
self: *Compiler,
op_short: u8,
op_long: u8,
idx: chunks.ConstantIndex,
) !void {
switch (idx) {
.Small => |val| try self.emitBytes(op_short, val),
.Long => |val| blk: {
try self.emitByte(chunks.OpCode.DefineGlobalLong);
try self.emitByte(op_long);
try self.emitByte(val[0]);
try self.emitByte(val[1]);
try self.emitByte(val[2]);
@ -381,6 +399,14 @@ pub const Compiler = struct {
}
}
fn defineVariable(self: *Compiler, global: chunks.ConstantIndex) !void {
try self.emitConstWithIndex(
chunks.OpCode.DefineGlobal,
chunks.OpCode.DefineGlobalLong,
global,
);
}
fn varDecl(self: *Compiler) !void {
var global = try self.parseVariable("Expect variable name.");