110 lines
3.6 KiB
Systemverilog
110 lines
3.6 KiB
Systemverilog
// DESCRIPTION: Verilator: Verilog Test module
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//
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// This file ONLY is placed under the Creative Commons Public Domain.
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// SPDX-FileCopyrightText: 2026 PlanV GmbH
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// SPDX-License-Identifier: CC0-1.0
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// Test: rand_mode on nested object's variable should not cause Z3 solver error.
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// Previously, the generated SMT constraint used "#x0" instead of the variable
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// name for nested rand variables when rand_mode was involved, causing a width
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// mismatch in the constraint solver.
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class InnerClass;
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rand bit [7:0] inner_val1;
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rand bit [7:0] inner_val2;
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constraint inner_con {
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inner_val1 inside {[8'd10 : 8'd50]};
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inner_val2 inside {[8'd100 : 8'd200]};
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}
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function new();
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inner_val1 = 0;
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inner_val2 = 0;
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endfunction
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endclass
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class OuterClass;
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rand InnerClass nested_obj;
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rand bit [7:0] outer_val;
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constraint outer_con {outer_val inside {[8'd1 : 8'd20]};}
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function new();
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nested_obj = new();
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outer_val = 0;
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endfunction
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endclass
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module t_constraint_global_nested_randmode;
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OuterClass obj;
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int rand_ok;
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int change_count;
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bit [7:0] prev_val;
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initial begin
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obj = new();
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// Test 1: Normal randomization of nested object with constraints
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rand_ok = obj.randomize();
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if (rand_ok == 0) $stop;
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if (obj.nested_obj.inner_val1 < 8'd10 || obj.nested_obj.inner_val1 > 8'd50) $stop;
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if (obj.nested_obj.inner_val2 < 8'd100 || obj.nested_obj.inner_val2 > 8'd200) $stop;
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if (obj.outer_val < 8'd1 || obj.outer_val > 8'd20) $stop;
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// Test 2: Multiple randomizations with constraint checking
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change_count = 0;
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prev_val = obj.nested_obj.inner_val1;
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repeat (10) begin
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rand_ok = obj.randomize();
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if (rand_ok == 0) $stop;
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if (obj.nested_obj.inner_val1 < 8'd10 || obj.nested_obj.inner_val1 > 8'd50) $stop;
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if (obj.nested_obj.inner_val2 < 8'd100 || obj.nested_obj.inner_val2 > 8'd200) $stop;
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if (obj.outer_val < 8'd1 || obj.outer_val > 8'd20) $stop;
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if (obj.nested_obj.inner_val1 != prev_val) change_count++;
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prev_val = obj.nested_obj.inner_val1;
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end
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if (change_count == 0) $stop;
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// Test 3: rand_mode(0) on nested var - must not crash solver
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void'(obj.nested_obj.inner_val1.rand_mode(0));
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if (obj.nested_obj.inner_val1.rand_mode() != 0) $stop;
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// Calling randomize must not cause a solver crash
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rand_ok = obj.randomize();
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// (randomize may return 0 due to constraint interaction - separate issue)
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// Test 4: Re-enable rand_mode and verify randomization resumes
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void'(obj.nested_obj.inner_val1.rand_mode(1));
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if (obj.nested_obj.inner_val1.rand_mode() != 1) $stop;
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change_count = 0;
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prev_val = obj.nested_obj.inner_val1;
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repeat (10) begin
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rand_ok = obj.randomize();
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if (rand_ok == 0) $stop;
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if (obj.nested_obj.inner_val1 != prev_val) change_count++;
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prev_val = obj.nested_obj.inner_val1;
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end
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if (change_count == 0) $stop;
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// Test 5: rand_mode(0) on entire nested object - must not crash solver
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void'(obj.nested_obj.rand_mode(0));
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rand_ok = obj.randomize();
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// (randomize may return 0 due to constraint interaction - separate issue)
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// Test 6: Re-enable nested object and verify randomization resumes
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void'(obj.nested_obj.rand_mode(1));
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change_count = 0;
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prev_val = obj.nested_obj.inner_val1;
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repeat (10) begin
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rand_ok = obj.randomize();
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if (rand_ok == 0) $stop;
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if (obj.nested_obj.inner_val1 != prev_val) change_count++;
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prev_val = obj.nested_obj.inner_val1;
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end
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if (change_count == 0) $stop;
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$write("*-* All Finished *-*\n");
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$finish;
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end
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endmodule
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