From 49771f356fddda873405da2cc6aaffb2758abcbc Mon Sep 17 00:00:00 2001
From: LemonBoy <thatlemon@gmail.com>
Date: Tue, 14 Jan 2020 21:23:11 +0100
Subject: [PATCH] Make sure @export symbol name is not empty

---
 src/ir.cpp              | 6 ++++++
 test/compile_errors.zig | 9 +++++++++
 2 files changed, 15 insertions(+)

diff --git a/src/ir.cpp b/src/ir.cpp
index bbf56fd08d..d871aa27a0 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -16766,6 +16766,12 @@ static IrInstruction *ir_analyze_instruction_export(IrAnalyze *ira, IrInstructio
     if (!symbol_name)
         return ira->codegen->invalid_instruction;
 
+    if (buf_len(symbol_name) < 1) {
+        ir_add_error(ira, name_inst,
+            buf_sprintf("exported symbol name cannot be empty"));
+        return ira->codegen->invalid_instruction;
+    }
+
     GlobalLinkageId global_linkage_id;
     if (!ir_resolve_global_linkage(ira, linkage_inst, &global_linkage_id))
         return ira->codegen->invalid_instruction;
diff --git a/test/compile_errors.zig b/test/compile_errors.zig
index 6552ad2413..3ce5bd8801 100644
--- a/test/compile_errors.zig
+++ b/test/compile_errors.zig
@@ -2,6 +2,15 @@ const tests = @import("tests.zig");
 const builtin = @import("builtin");
 
 pub fn addCases(cases: *tests.CompileErrorContext) void {
+    cases.addTest("@export with empty name string",
+        \\pub export fn entry() void { }
+        \\comptime {
+        \\    @export(entry, .{ .name = "" });
+        \\}
+    , &[_][]const u8{
+        "tmp.zig:3:5: error: exported symbol name cannot be empty",
+    });
+
     cases.addTest("switch ranges endpoints are validated",
         \\pub export fn entry() void {
         \\    var x: i32 = 0;