Add a test_mir_unsound_global

intTests/test_mir_unsound_global/Makefile

@@ -0,0 +1,17 @@
+# The current checked-in linked-mir.json file was generated by:
+#    rustc 1.69.0-nightly (5e37043d6 2023-01-22)
+#    mir-json c52b16bf26af2f5b98157ebf9975aa0021982bbc from 2024-09-11
+
+all: unsound_global.linked-mir.json
+
+unsound_global.linked-mir.json: unsound_global.rs
+	saw-rustc $<
+	$(MAKE) remove-unused-build-artifacts
+
+.PHONY: remove-unused-build-artifacts
+remove-unused-build-artifacts:
+	rm -f unsound_global libunsound_global.mir libunsound_global.rlib
+
+.PHONY: clean
+clean: remove-unused-build-artifacts
+	rm -f unsound_global.linked-mir.json

intTests/test_mir_unsound_global/test.sh

@@ -0,0 +1,6 @@
+# this is supposed to fail
+if ! $SAW unsound_global.saw ; then
+    exit 0
+else
+    exit 1
+fi

intTests/test_mir_unsound_global/unsound_global.linked-mir.json

@@ -0,0 +1 @@
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intTests/test_mir_unsound_global/unsound_global.rs

@@ -0,0 +1,33 @@
+// unsound_global.rs
+//
+// (this is essentially the same as unsound_global.c from
+// test_llvm_unsound_global)
+
+static mut TEST: u32 = 1;
+
+// the C version uses an array, but that currently causes extra
+// complications here (you can't successfully assign GLOBAL[1] without
+// initializing GLOBAL[0], and that requires also initializing
+// GLOBAL[1], and that changes the meaning of the test, so for now
+// just use a scalar.
+//static mut GLOBAL: [u32; 2] = [0, 0];
+static mut GLOBAL: u32 = 0;
+
+pub fn foo(x: u32) -> u32 {
+   //unsafe { GLOBAL[1] = x };
+   unsafe { GLOBAL = x };
+   x + 1
+}
+
+pub fn bar() -> u32 {
+   unsafe { TEST = 42 };
+   //unsafe { GLOBAL[1] = 0 };
+   unsafe { GLOBAL = 0 };
+   let val: u32 = foo(1);
+   // this does not go, not entirely sure why
+   //println!("{}", unsafe { TEST } );
+   // unsafe { GLOBAL[1] = 0 };
+   // unsafe { GLOBAL = 0 };
+   //val + unsafe { GLOBAL[1] }
+   val + unsafe { GLOBAL }
+}

intTests/test_mir_unsound_global/unsound_global.saw

@@ -0,0 +1,28 @@
+enable_experimental;
+
+MODULE <- mir_load_module "unsound_global.linked-mir.json";
+
+let foo_setup = do {
+  //mir_alloc_global "GLOBAL";
+  x <- mir_fresh_var "x" mir_u32;
+  mir_assert {{ x < 0x10000000 }};
+  mir_execute_func [mir_term x];
+  mir_return (mir_term {{ x + 1 : [32] }});
+  // mir_points_to (mir_elem (mir_static "GLOBAL") 1) (mir_term x);
+};
+foo_spec <- mir_verify MODULE "unsound_global::foo" [] false foo_setup z3;
+
+let bar_setup = do {
+  //mir_alloc_global "GLOBAL";
+  //mir_alloc_global "TEST";
+  mir_execute_func [];
+  mir_return (mir_term {{ 2 : [32] }});
+};
+
+// the below line (without override) correctly fails
+// mir_verify MODULE "unsound_global::bar" [] false bar_setup z3;
+
+// this also correctly fails these days
+mir_verify MODULE "unsound_global::bar" [foo_spec] false bar_setup z3;
+
+print "Should not have succeeded - unsound!";