ir: Evaluate constant strings too.

Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>

4 files changed, 22 insertions, 1 deletions

diff --git a/libbindgen/src/clang.rs b/libbindgen/src/clang.rs
index fc5575b3..491aaa07 100644
--- a/libbindgen/src/clang.rs
+++ b/libbindgen/src/clang.rs
@@ -1348,6 +1348,20 @@ impl EvalResult {
             _ => None,
         }
     }
+
+    /// Evaluates the expression as a literal string, that may or may not be
+    /// valid utf-8.
+    pub fn as_literal_string(&self) -> Option<Vec<u8>> {
+        match self.kind() {
+            CXEval_StrLiteral => {
+                let ret = unsafe {
+                    CStr::from_ptr(clang_EvalResult_getAsStr(self.x))
+                };
+                Some(ret.to_bytes().to_vec())
+            }
+            _ => None,
+        }
+    }
 }
 
 impl Drop for EvalResult {
diff --git a/libbindgen/src/ir/var.rs b/libbindgen/src/ir/var.rs
index d9160eca..e18af91b 100644
--- a/libbindgen/src/ir/var.rs
+++ b/libbindgen/src/ir/var.rs
@@ -236,7 +236,9 @@ impl ClangSubItemParser for Var {
                         .and_then(|v| v.as_double())
                         .map(VarType::Float)
                 } else {
-                    None
+                    cursor.evaluate()
+                        .and_then(|v| v.as_literal_string())
+                        .map(VarType::String)
                 };
 
                 let mangling = cursor_mangling(&cursor);
diff --git a/libbindgen/tests/expectations/tests/constant-evaluate.rs b/libbindgen/tests/expectations/tests/constant-evaluate.rs
index 6947be98..cdf097a2 100644
--- a/libbindgen/tests/expectations/tests/constant-evaluate.rs
+++ b/libbindgen/tests/expectations/tests/constant-evaluate.rs
@@ -16,3 +16,5 @@ pub const BAZ: ::std::os::raw::c_longlong = 24;
 pub const fuzz: f64 = 51.;
 pub const BAZZ: ::std::os::raw::c_char = 53;
 pub const WAT: ::std::os::raw::c_char = 0;
+pub const bytestring: &'static [u8; 4usize] = b"Foo\x00";
+pub const NOT_UTF8: [u8; 5usize] = [240, 40, 140, 40, 0];
diff --git a/libbindgen/tests/headers/constant-evaluate.h b/libbindgen/tests/headers/constant-evaluate.h
index b6a0492f..f9f1fa66 100644
--- a/libbindgen/tests/headers/constant-evaluate.h
+++ b/libbindgen/tests/headers/constant-evaluate.h
@@ -14,3 +14,6 @@ const long long BAZ = (1 << foo) | bar;
 const double fuzz = (1 + 50.0f);
 const char BAZZ = '5';
 const char WAT = '\0';
+
+const char* bytestring = "Foo";
+const char* NOT_UTF8 = "\xf0\x28\x8c\x28";