[vala] Improve assertion messages

[JÃrg Billeter <juergbi src gnome org>]

commit 4051a8a36cd40ec4a78c1eb963c10080557b54da
Author: JÃrg Billeter <j bitron ch>
Date:   Sat Jun 2 18:17:43 2012 +0200

    Improve assertion messages
    
    Fixes bug 658825.

 codegen/valaccodebasemodule.vala       |    5 +++++
 codegen/valaccodemethodcallmodule.vala |    8 ++++++++
 vala/valamethodcall.vala               |    5 +++++
 3 files changed, 18 insertions(+), 0 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index 57ac8a5..c158eaf 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -321,6 +321,7 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 	public string module_init_param_name;
 	
 	public bool gvaluecollector_h_needed;
+	public bool requires_assert;
 	public bool requires_array_free;
 	public bool requires_array_move;
 	public bool requires_array_length;
@@ -664,6 +665,7 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 		next_regex_id = 0;
 		
 		gvaluecollector_h_needed = false;
+		requires_assert = false;
 		requires_array_free = false;
 		requires_array_move = false;
 		requires_array_length = false;
@@ -692,6 +694,9 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
 			return;
 		}
 
+		if (requires_assert) {
+			cfile.add_type_declaration (new CCodeMacroReplacement.with_expression ("_vala_assert(expr, msg)", new CCodeConstant ("if G_LIKELY (expr) ; else g_assertion_message_expr (G_LOG_DOMAIN, __FILE__, __LINE__, G_STRFUNC, msg);")));
+		}
 		if (requires_array_free) {
 			append_vala_array_free ();
 		}
diff --git a/codegen/valaccodemethodcallmodule.vala b/codegen/valaccodemethodcallmodule.vala
index 296efc1..8be973e 100644
--- a/codegen/valaccodemethodcallmodule.vala
+++ b/codegen/valaccodemethodcallmodule.vala
@@ -677,6 +677,14 @@ public class Vala.CCodeMethodCallModule : CCodeAssignmentModule {
 			ccode.add_label ("_state_%d".printf (state));
 		}
 
+		if (expr.is_assert) {
+			string message = ((string) expr.source_reference.begin.pos).substring (0, (int) (expr.source_reference.end.pos - expr.source_reference.begin.pos));
+			ccall.call = new CCodeIdentifier ("_vala_assert");
+			ccall.add_argument (new CCodeConstant ("\"%s\"".printf (message.replace ("\n", " ").escape (""))));
+			requires_assert = true;
+
+		}
+
 		if (return_result_via_out_param) {
 			ccode.add_expression (ccall_expr);
 			ccall_expr = out_param_ref;
diff --git a/vala/valamethodcall.vala b/vala/valamethodcall.vala
index f0e9585..33b820f 100644
--- a/vala/valamethodcall.vala
+++ b/vala/valamethodcall.vala
@@ -203,6 +203,11 @@ public class Vala.MethodCall : Expression {
 
 			if (ma.symbol_reference != null && ma.symbol_reference.get_attribute ("Assert") != null) {
 				this.is_assert = true;
+
+				var args = get_argument_list ();
+				if (args.size == 1) {
+					this.source_reference = args[0].source_reference;
+				}
 			}
 		}