在Xcelium与Specman集成中有效设置环境变量的指南

# 对于Bash/Zsh等Shell
# 设置一个自定义的Python脚本路径
export PYTHON_SCRIPTS_DIR="/home/user/my_project/python_utils"
# 如果Python脚本是可执行文件，确保其路径在PATH中
export PATH="$PYTHON_SCRIPTS_DIR:$PATH"
# 设置其他任何Specman或Python可能需要的变量
export MY_CUSTOM_VAR="some_value_for_e_or_python"

# 启动Xcelium仿真
xrun -clean -sv -uvm -top top_module -f file_list.f -access +rwc -input initial.tcl ...

// Specman 'e' 代码示例
extend sys {
    run() is first {
        // 构建调用Python脚本的命令字符串
        // Python脚本将继承Xcelium进程的环境变量
        var python_cmd: string = "python -c 'import os; print(\"PYTHON_SCRIPTS_DIR from Python:\", os.environ.get(\"PYTHON_SCRIPTS_DIR\")); print(\"MY_CUSTOM_VAR from Python:\", os.environ.get(\"MY_CUSTOM_VAR\", \"Not Set\"))'";

        message(LOW, "Executing Python command from 'e': ", python_cmd);
        var result: list of string = os_cmd(python_cmd);

        // 打印Python脚本的输出
        for each line in result {
            message(LOW, "Python Output: ", line);
        };

        // 也可以直接调用一个外部的Python脚本文件
        var external_script_cmd: string = "python $PYTHON_SCRIPTS_DIR/my_utility_script.py";
        message(LOW, "Executing external Python script: ", external_script_cmd);
        os_cmd(external_script_cmd);
    };
};

# my_utility_script.py
import os

print(f"Hello from Python! Current working directory: {os.getcwd()}")
print(f"PATH environment variable: {os.environ.get('PATH')}")
print(f"PYTHON_SCRIPTS_DIR: {os.environ.get('PYTHON_SCRIPTS_DIR', 'Not set in Python')}")
print(f"MY_CUSTOM_VAR: {os.environ.get('MY_CUSTOM_VAR', 'Not set in Python')}")

# 可以根据环境变量的值执行不同的逻辑
if os.environ.get("MY_CUSTOM_VAR") == "some_value_for_e_or_python":
    print("MY_CUSTOM_VAR is recognized and has the expected value.")

# 在Xcelium启动时加载的Tcl脚本 (例如通过 xrun -input initial.tcl)
# 或者在Xcelium Tcl控制台中直接输入

# 访问环境变量
if {[info exists ::env(PYTHON_SCRIPTS_DIR)]} {
    puts "PYTHON_SCRIPTS_DIR (from Tcl): $::env(PYTHON_SCRIPTS_DIR)"
} else {
    puts "PYTHON_SCRIPTS_DIR (from Tcl): Not set"
}

if {[info exists ::env(MY_CUSTOM_VAR)]} {
    puts "MY_CUSTOM_VAR (from Tcl): $::env(MY_CUSTOM_VAR)"
} else {
    puts "MY_CUSTOM_VAR (from Tcl): Not set"
}

# 示例：根据环境变量构建并执行命令
set python_dir $::env(PYTHON_SCRIPTS_DIR)
if {$python_dir ne ""} {
    set command "python $python_dir/my_other_script.py"
    puts "Executing command from Tcl: $command"
    # 注意：exec命令会启动一个新的子进程，该子进程会继承Xcelium的环境
    catch {exec $command} result
    puts "Tcl exec result: $result"
}