Fix: calling twice proc with extern didn't work. Fixes #4982

asterite · Martin Verzilli · commit 7f4ccff9a0c3 · 2017-09-16T18:34:11.000-03:00
diff --git a/spec/compiler/codegen/extern_spec.cr b/spec/compiler/codegen/extern_spec.cr
@@ -143,6 +143,27 @@ describe "Codegen: extern struct" do
       )).to_i.should eq(42)
   end
 
+  it "codegens extern proc call twice (#4982)" do
+    run(%(
+      @[Extern]
+      struct Data
+        def initialize(@foo : Int32)
+        end
+
+        def foo
+          @foo
+        end
+      end
+
+      f = ->(data : Data) { data.foo }
+
+      x = f.call(Data.new(1))
+      y = f.call(Data.new(2))
+
+      x + y
+      )).to_i.should eq(3)
+  end
+
   # These specs *should* also work for 32 bits, but for now we'll
   # make sure they work in 64 bits (they probably work in 32 bits too,
   # it's just that the specs need to be a bit different)
diff --git a/src/compiler/crystal/codegen/ast.cr b/src/compiler/crystal/codegen/ast.cr
@@ -98,7 +98,7 @@ module Crystal
     end
 
     @c_calling_convention : Bool? = nil
-    setter c_calling_convention
+    property c_calling_convention
 
     # Returns `self` as an `External` if this Def is an External
     # that must respect the C calling convention.
diff --git a/src/compiler/crystal/codegen/primitives.cr b/src/compiler/crystal/codegen/primitives.cr
@@ -651,7 +651,7 @@ class Crystal::CodeGenVisitor
     c_calling_convention = target_def.proc_c_calling_convention?
 
     proc_type = context.type.as(ProcInstanceType)
-    0.upto(target_def.args.size - 1) do |i|
+    target_def.args.size.times do |i|
       arg = args[i]
       proc_arg_type = proc_type.arg_types[i]
       target_def_arg_type = target_def.args[i].type
@@ -685,6 +685,9 @@ class Crystal::CodeGenVisitor
       # arguments according to the ABI.
       # For this we temporarily set the target_def's `abi_info` and `c_calling_convention`
       # properties for the non-closure branch, and then reset it.
+      old_abi_info = target_def.abi_info?
+      old_c_calling_convention = target_def.c_calling_convention
+
       if c_calling_convention
         null_fun_ptr, null_args = codegen_extern_primitive_proc_call(target_def, args, fun_ptr)
       else
@@ -695,8 +698,6 @@ class Crystal::CodeGenVisitor
       phi.add value, node.type
 
       # Reset abi_info + c_calling_convention so the closure part is generated as usual
-      old_abi_info = target_def.abi_info?
-      old_c_calling_convention = target_def.c_calling_convention?
       target_def.abi_info = false
       target_def.c_calling_convention = nil
 
@@ -707,7 +708,7 @@ class Crystal::CodeGenVisitor
       phi.add value, node.type, true
 
       target_def.abi_info = old_abi_info
-      target_def.c_calling_convention = !!old_c_calling_convention
+      target_def.c_calling_convention = old_c_calling_convention
     end
 
     old_needs_value = @needs_value
