vkd3d-shader/preproc: Store EOF state per buffer.

We may immediately push a new file or expansion.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=43481

libs/vkd3d-shader/preproc.h

@@ -38,6 +38,7 @@ struct preproc_buffer
 {
     void *lexer_buffer;
     struct vkd3d_shader_location location;
+    bool eof;
 };
 
 struct preproc_file
@@ -125,7 +126,6 @@ struct preproc_ctx
     int lookahead_token;
 
     bool last_was_newline;
-    bool last_was_eof;
     bool last_was_defined;
 
     bool error;

libs/vkd3d-shader/preproc.l

@@ -258,8 +258,19 @@ static bool should_concat(struct preproc_ctx *ctx)
     return !macro || macro->arg_count;
 }
 
+static struct preproc_buffer *preproc_get_top_buffer(struct preproc_ctx *ctx)
+{
+    if (ctx->expansion_count)
+        return &ctx->expansion_stack[ctx->expansion_count - 1].buffer;
+    if (ctx->file_count)
+        return &ctx->file_stack[ctx->file_count - 1].buffer;
+    return NULL;
+}
+
 static void preproc_pop_buffer(struct preproc_ctx *ctx)
 {
+    struct preproc_buffer *buffer;
+
     if (ctx->expansion_count)
     {
         struct preproc_expansion *exp = &ctx->expansion_stack[ctx->expansion_count - 1];
@@ -298,10 +309,8 @@ static void preproc_pop_buffer(struct preproc_ctx *ctx)
         TRACE("File stack size is now %zu.\n", ctx->file_count);
     }
 
-    if (ctx->expansion_count)
-        yy_switch_to_buffer(ctx->expansion_stack[ctx->expansion_count - 1].buffer.lexer_buffer, ctx->scanner);
-    else if (ctx->file_count)
-        yy_switch_to_buffer(ctx->file_stack[ctx->file_count - 1].buffer.lexer_buffer, ctx->scanner);
+    if ((buffer = preproc_get_top_buffer(ctx)))
+        yy_switch_to_buffer(buffer->lexer_buffer, ctx->scanner);
 }
 
 static int return_token(int token, YYSTYPE *lval, const char *text)
@@ -355,6 +364,7 @@ static bool preproc_push_expansion(struct preproc_ctx *ctx,
     exp->text = text;
     exp->buffer.lexer_buffer = yy_scan_bytes(text->text.buffer, text->text.content_size, ctx->scanner);
     exp->buffer.location = text->location;
+    exp->buffer.eof = false;
     exp->macro = macro;
     exp->arg_values = arg_values;
     TRACE("Expansion stack size is now %zu.\n", ctx->expansion_count);
@@ -415,18 +425,17 @@ int yylex(YYSTYPE *lval, YYLTYPE *lloc, yyscan_t scanner)
         }
         else
         {
-            if (ctx->last_was_eof)
+            if (preproc_get_top_buffer(ctx)->eof)
             {
                 preproc_pop_buffer(ctx);
                 if (!ctx->file_count)
                     return 0;
             }
-            ctx->last_was_eof = false;
 
             VKD3D_ASSERT(ctx->file_count);
             if (!(token = preproc_lexer_lex(lval, lloc, scanner)))
             {
-                ctx->last_was_eof = true;
+                preproc_get_top_buffer(ctx)->eof = true;
 
                 /* If we have reached the end of an included file, inject a newline. */
                 if (ctx->expansion_count)
@@ -789,6 +798,7 @@ bool preproc_push_include(struct preproc_ctx *ctx, char *filename, const struct
     file->buffer.location.source_name = file->filename;
     file->buffer.location.line = 1;
     file->buffer.location.column = 1;
+    file->buffer.eof = false;
     TRACE("File stack size is now %zu.\n", ctx->file_count);
     ctx->last_was_newline = true;
     return true;

tests/hlsl_d3d12.c

@@ -84,7 +84,15 @@ static const char test_include2_top[] =
     "#include \"file4\"\n"
     ",ss)";
 
+/* Test #include immediately followed by EOF. */
 static const char test_include2_file4[] =
+    "#include \"file5\"";
+
+/* Test #include immediately followed by comment immediately followed by EOF. */
+static const char test_include2_file5[] =
+    "#include \"file6\"/*";
+
+static const char test_include2_file6[] =
     "FUNC(pa";
 
 static unsigned int refcount_file1, refcount_file2, refcount_file3, include_count_file2;
@@ -128,6 +136,20 @@ static HRESULT WINAPI test_include_Open(ID3DInclude *iface, D3D_INCLUDE_TYPE typ
         *code = test_include2_file4;
         *size = strlen(test_include2_file4);
     }
+    else if (!strcmp(filename, "file5"))
+    {
+        ok(type == D3D_INCLUDE_LOCAL, "Got type %#x.\n", type);
+        ok(parent_data == test_include2_file4, "Got parent data %p.\n", parent_data);
+        *code = test_include2_file5;
+        *size = strlen(test_include2_file5);
+    }
+    else if (!strcmp(filename, "file6"))
+    {
+        ok(type == D3D_INCLUDE_LOCAL, "Got type %#x.\n", type);
+        ok(parent_data == test_include2_file5, "Got parent data %p.\n", parent_data);
+        *code = test_include2_file6;
+        *size = strlen(test_include2_file6);
+    }
     else
     {
         ok(0, "Unexpected filename \"%s\".\n", filename);
@@ -392,7 +414,13 @@ static void test_preprocess(void)
 
             "pass",
             "fail",
-        }
+        },
+
+        /* Make sure we handle the empty-file case without breaking. */
+        {
+            "",
+            "",
+        },
     };
 
     for (i = 0; i < ARRAY_SIZE(tests); ++i)