testsuite/synth: add a test with uninitialized shared variable

3 files changed, 101 insertions, 1 deletions

diff --git a/testsuite/synth/synth109/ram10.vhdl b/testsuite/synth/synth109/ram10.vhdl
new file mode 100644
index 000000000..77fd4c915
--- /dev/null
+++ b/testsuite/synth/synth109/ram10.vhdl
@@ -0,0 +1,38 @@
+library ieee;
+use ieee.std_logic_1164.all;
+use ieee.numeric_std.all;
+
+entity ram10 is
+  generic (
+    WIDTHB      : integer := 32;
+    SIZEB       : integer := 64;
+    ADDRWIDTHB  : integer := 6
+    );
+
+  port (
+    clkB   : in  std_logic;
+    enB    : in  std_logic;
+    weB    : in  std_logic;
+    addrB  : in  std_logic_vector(ADDRWIDTHB-1 downto 0);
+    diB    : in  std_logic_vector(WIDTHB-1 downto 0);
+    doB    : out std_logic_vector(WIDTHB-1 downto 0)
+    );
+
+end ram10;
+
+architecture behavioral of ram10 is
+  type ramType is array (0 to SIZEB-1) of std_logic_vector(WIDTHB-1 downto 0);
+  shared variable ram : ramType;
+begin
+  process (clkB)
+  begin
+    if rising_edge(clkB) then
+      if enB = '1' then
+        if weB = '1' then
+          ram(to_integer(unsigned(addrB))) := diB;
+        end if;
+        doB <= ram(to_integer(unsigned(addrB)));
+      end if;
+    end if;
+  end process;
+end behavioral;
diff --git a/testsuite/synth/synth109/tb_ram10.vhdl b/testsuite/synth/synth109/tb_ram10.vhdl
new file mode 100644
index 000000000..9d9e3c15c
--- /dev/null
+++ b/testsuite/synth/synth109/tb_ram10.vhdl
@@ -0,0 +1,62 @@
+entity tb_ram10 is
+end tb_ram10;
+
+library ieee;
+use ieee.std_logic_1164.all;
+
+architecture behav of tb_ram10 is
+  signal clk : std_logic;
+  signal en : std_logic;
+  signal we : std_logic;
+  signal addr : std_logic_vector(5 downto 0);
+  signal rdat : std_logic_vector(31 downto 0);
+  signal wdat : std_logic_vector(31 downto 0);
+begin
+  dut: entity work.ram10
+    port map (clkB => clk, enB => en, weB => we, addrB => addr,
+              diB => wdat, doB => rdat);
+
+  process
+    procedure pulse is
+    begin
+      clk <= '0';
+      wait for 1 ns;
+      clk <= '1';
+      wait for 1 ns;
+    end pulse;
+  begin
+    en <= '1';
+    we <= '1';
+    addr <= b"00_0000";
+    wdat <= x"11_22_33_f0";
+    pulse;
+    assert rdat = x"11_22_33_f0" severity failure;
+
+    addr <= b"00_0001";
+    wdat <= x"11_22_33_f1";
+    pulse;
+    assert rdat = x"11_22_33_f1" severity failure;
+
+    --  Read.
+    we <= '0';
+    addr <= b"00_0000";
+    wdat <= x"ff_22_33_f1";
+    pulse;
+    assert rdat = x"11_22_33_f0" severity failure;
+
+    addr <= b"00_0001";
+    wdat <= x"ff_22_33_f1";
+    pulse;
+    assert rdat = x"11_22_33_f1" severity failure;
+
+    --  Disable.
+    en <= '0';
+    we <= '1';
+    addr <= b"00_0000";
+    wdat <= x"11_22_33_f0";
+    pulse;
+    assert rdat = x"11_22_33_f1" severity failure;
+
+    wait;
+  end process;
+end behav;
diff --git a/testsuite/synth/synth109/testsuite.sh b/testsuite/synth/synth109/testsuite.sh
index cc1803015..62e8026af 100755
--- a/testsuite/synth/synth109/testsuite.sh
+++ b/testsuite/synth/synth109/testsuite.sh
@@ -4,7 +4,7 @@
 
 GHDL_STD_FLAGS="-fsynopsys"
 
-for t in ram1 ram2 ram4; do
+for t in ram1 ram10 ram2 ram4; do
     synth_tb $t 2> $t.log
     grep "found R" $t.log
 done