Auto merge of #264 - fitzgen:emit-ir, r=emilio

Add an option to emit our ir for debugging

Similar to our ability to emit the clang AST, this adds an option to
emit our IR for debugging purposes.

This can wait to land until after #204 is merged.

r? @emilio

4 files changed, 24 insertions, 1 deletions

diff --git a/.travis.yml b/.travis.yml
index 48f0b4b1..9c7c1155 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,6 @@ os:
 
 rust:
   - stable
-  - nightly
 
 env:
   - LLVM_VERSION=3.8 BINDGEN_FEATURES=llvm_stable
diff --git a/libbindgen/src/codegen/mod.rs b/libbindgen/src/codegen/mod.rs
index 8e04fd7c..009d8819 100644
--- a/libbindgen/src/codegen/mod.rs
+++ b/libbindgen/src/codegen/mod.rs
@@ -1892,6 +1892,13 @@ pub fn codegen(context: &mut BindgenContext) -> Vec<P<ast::Item>> {
 
         let whitelisted_items: ItemSet = context.whitelisted_items().collect();
 
+        if context.options().emit_ir {
+            for &id in whitelisted_items.iter() {
+                let item = context.resolve_item(id);
+                println!("ir: {:?} = {:#?}", id, item);
+            }
+        }
+
         for &id in whitelisted_items.iter() {
             let item = context.resolve_item(id);
 
diff --git a/libbindgen/src/lib.rs b/libbindgen/src/lib.rs
index d0ca7b03..e4923b77 100644
--- a/libbindgen/src/lib.rs
+++ b/libbindgen/src/lib.rs
@@ -225,6 +225,12 @@ impl Builder {
         self
     }
 
+    /// Emit IR.
+    pub fn emit_ir(mut self) -> Builder {
+        self.options.emit_ir = true;
+        self
+    }
+
     /// Enable C++ namespaces.
     pub fn enable_cxx_namespaces(mut self) -> Builder {
         self.options.enable_cxx_namespaces = true;
@@ -314,6 +320,9 @@ pub struct BindgenOptions {
     /// True if we should dump the Clang AST for debugging purposes.
     pub emit_ast: bool,
 
+    /// True if we should dump our internal IR for debugging purposes.
+    pub emit_ir: bool,
+
     /// True if we should ignore functions and only generate bindings for
     /// structures, types, and methods.
     pub ignore_functions: bool,
@@ -380,6 +389,7 @@ impl Default for BindgenOptions {
             builtins: false,
             links: vec![],
             emit_ast: false,
+            emit_ir: false,
             ignore_functions: false,
             ignore_methods: false,
             derive_debug: true,
diff --git a/src/options.rs b/src/options.rs
index c3c6a1f2..2ea74a27 100644
--- a/src/options.rs
+++ b/src/options.rs
@@ -52,6 +52,9 @@ pub fn builder_from_flags<I>(args: I)
             Arg::with_name("emit-clang-ast")
                 .long("emit-clang-ast")
                 .help("Output the Clang AST for debugging purposes."),
+            Arg::with_name("emit-ir")
+                .long("emit-ir")
+                .help("Output our internal IR for debugging purposes."),
             Arg::with_name("enable-cxx-namespaces")
                 .long("enable-cxx-namespaces")
                 .help("Enable support for C++ namespaces."),
@@ -183,6 +186,10 @@ pub fn builder_from_flags<I>(args: I)
         builder = builder.emit_clang_ast();
     }
 
+    if matches.is_present("emit-ir") {
+        builder = builder.emit_ir();
+    }
+
     if matches.is_present("enable-cxx-namespaces") {
         builder = builder.enable_cxx_namespaces();
     }