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const std = @import("std");
pub const Block = @import("block.zig");
pub const Instruction = @import("instruction.zig").Instruction;
pub const Node = @import("node.zig");
pub const Grammar = @import("../grammar.zig");
const optimizer = @import("optimizer/root.zig");
const Self = @This();
grammar: *Grammar,
blocks: []Block,
node_pool: std.heap.MemoryPool(Node),
pub fn compile(grammar: *Grammar, allocator: std.mem.Allocator) !Self {
const raw_blocks = try allocator.alloc(Block, grammar.non_terminals.len);
defer {
for (raw_blocks) |*block| {
block.deinit(allocator);
}
allocator.free(raw_blocks);
}
var raw_node_pool: std.heap.MemoryPool(Node) = .init(allocator);
defer raw_node_pool.deinit();
for (raw_blocks, grammar.non_terminals) |*block, *non_terminal| {
block.* = try .compile(non_terminal, &raw_node_pool, allocator);
}
var self: Self = .{
.grammar = grammar,
.blocks = try allocator.alloc(Block, grammar.non_terminals.len),
.node_pool = .init(allocator),
};
for (self.blocks, raw_blocks) |*optimized, *raw| {
try optimizer.optimize_block(raw_blocks, raw, optimized, &self.node_pool, allocator);
}
return self;
}
pub fn deinit(self: *Self, allocator: std.mem.Allocator) void {
for (self.blocks) |*block| {
block.deinit(allocator);
}
allocator.free(self.blocks);
self.node_pool.deinit();
self.* = undefined;
}
pub fn entry_point(self: *const Self) *Block {
return &self.blocks[0];
}
test "terminals-single" {
const allocator = std.testing.allocator;
var grammar = try Grammar.parse("S", "S -> 'a'", allocator);
defer grammar.deinit();
var pex = try Self.compile(&grammar, allocator);
defer pex.deinit(allocator);
try std.testing.expectEqual(2, pex.blocks.len);
try std.testing.expectEqual(1, pex.blocks[1].heads.items.len);
try std.testing.expectEqual(
Instruction{ .check = 'a' },
pex.blocks[1].heads.items[0].instruction
);
try std.testing.expectEqual(1, pex.blocks[1].heads.items[0].next.items.len);
try std.testing.expectEqual(
Instruction{ .@"return" = void{} },
pex.blocks[1].heads.items[0].next.items[0].instruction
);
}
test "terminals-single-thread" {
const allocator = std.testing.allocator;
var grammar = try Grammar.parse("S", "S -> 'abc'", allocator);
defer grammar.deinit();
var pex = try Self.compile(&grammar, allocator);
defer pex.deinit(allocator);
try std.testing.expectEqual(2, pex.blocks.len);
try std.testing.expectEqual(1, pex.blocks[1].heads.items.len);
var current = pex.blocks[1].heads.items[0];
for ("abc") |c| {
try std.testing.expectEqual(
Instruction{ .check = c },
current.instruction,
);
try std.testing.expectEqual(1, current.next.items.len);
current = current.next.items[0];
}
try std.testing.expectEqual(
Instruction{ .@"return" = void{} },
current.instruction,
);
}
test "direct-left-recursion" {
const allocator = std.testing.allocator;
var grammar = try Grammar.parse("S", "S -> 'a' | S 'a'", allocator);
defer grammar.deinit();
var pex = try Self.compile(&grammar, allocator);
defer pex.deinit(allocator);
try std.testing.expectEqual(2, pex.blocks.len);
try std.testing.expectEqual(1, pex.blocks[1].heads.items.len);
try std.testing.expectEqual(
Instruction{ .check = 'a' },
pex.blocks[1].heads.items[0].instruction,
);
try std.testing.expectEqual(
Instruction{ .@"return" = void{} },
pex.blocks[1].heads.items[0].next.items[0].instruction,
);
try std.testing.expectEqual(
Instruction{ .check = 'a' },
pex.blocks[1].heads.items[0].next.items[1].next.items[0].instruction,
);
try std.testing.expectEqual(
Instruction{ .@"return" = void{} },
pex.blocks[1]
.heads.items[0]
.next.items[1]
.next.items[0]
.next.items[0]
.instruction,
);
try std.testing.expect(
pex.blocks[1]
.heads.items[0]
.next.items[1]
.next.items[0]
.next.items[1]
.instruction == .jump
);
try std.testing.expectEqual(
Instruction{ .@"return" = void{} },
pex.blocks[1]
.heads.items[0]
.next.items[1]
.next.items[0]
.next.items[1]
.next.items[0]
.instruction,
);
}
|
