Imported Upstream version 1.4.19

[platform/upstream/m4.git] / tests / test-verify.c

diff --git a/tests/test-verify.c b/tests/test-verify.c
index d7ca053..65b926a 100644 (file)
--- a/tests/test-verify.c
+++ b/tests/test-verify.c
@@ -1,6 +1,6 @@
 /* Test the "verify" module.
 
-   Copyright (C) 2005, 2009-2016 Free Software Foundation, Inc.
+   Copyright (C) 2005, 2009-2021 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -13,7 +13,7 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* Written by Bruno Haible.  */
 
@@ -25,13 +25,15 @@
 # define EXP_FAIL 0
 #endif
 
-int x;
-enum { a, b, c };
+/* ======================= Test verify, verify_expr ======================= */
+
+int gx;
+enum { A, B, C };
 
 #if EXP_FAIL == 1
-verify (x >= 0);                  /* should give ERROR: non-constant expression */
+verify (gx >= 0);                 /* should give ERROR: non-constant expression */
 #endif
-verify (c == 2);                  /* should be ok */
+verify (C == 2);                  /* should be ok */
 #if EXP_FAIL == 2
 verify (1 + 1 == 3);              /* should give ERROR */
 #endif
@@ -39,7 +41,7 @@ verify (1 == 1); verify (1 == 1); /* should be ok */
 
 enum
 {
-  item = verify_true (1 == 1) * 0 + 17 /* should be ok */
+  item = verify_expr (1 == 1, 10 * 0 + 17) /* should be ok */
 };
 
 static int
@@ -48,7 +50,7 @@ function (int n)
 #if EXP_FAIL == 3
   verify (n >= 0);                  /* should give ERROR: non-constant expression */
 #endif
-  verify (c == 2);                  /* should be ok */
+  verify (C == 2);                  /* should be ok */
 #if EXP_FAIL == 4
   verify (1 + 1 == 3);              /* should give ERROR */
 #endif
@@ -62,8 +64,56 @@ function (int n)
   return 0;
 }
 
+/* ============================== Test assume ============================== */
+
+static int
+f (int a)
+{
+  return a;
+}
+
+typedef struct { unsigned int context : 4; unsigned int halt : 1; } state;
+
+void test_assume_expressions (state *s);
+int test_assume_optimization (int x);
+_Noreturn void test_assume_noreturn (void);
+
+void
+test_assume_expressions (state *s)
+{
+  /* Check that 'assume' accepts a function call, even of a non-const
+     function.  */
+  assume (f (1));
+  /* Check that 'assume' accepts a bit-field expression.  */
+  assume (s->halt);
+}
+
+int
+test_assume_optimization (int x)
+{
+  /* Check that the compiler uses 'assume' for optimization.
+     This function, when compiled with optimization, should have code
+     equivalent to
+       return x + 3;
+     Use 'objdump --disassemble test-verify.o' to verify this.  */
+  assume (x >= 4);
+  return (x > 1 ? x + 3 : 2 * x + 10);
+}
+
+_Noreturn void
+test_assume_noreturn (void)
+{
+  /* Check that the compiler's data-flow analysis recognizes 'assume (0)'.
+     This function should not elicit a warning.  */
+  assume (0);
+}
+
+/* ============================== Main ===================================== */
 int
 main (void)
 {
+  state s = { 0, 1 };
+  test_assume_expressions (&s);
+  test_assume_optimization (5);
   return !(function (0) == 0 && function (1) == 8);
 }