# Regression test: `stat` must account for the area of blackbox cells whose
# area comes from the module's `area` attribute (rather than from a `-liberty`
# file passed to `stat` itself).
#
# Both the `read_liberty` (-lib) and `read_liberty2json` frontends attach the
# cell area to the blackbox module as a STRING attribute:
#   frontends/liberty/liberty.cc:   module->attributes[ID::area] = area->value;        // raw liberty string, e.g. "1.500000"
#   passes/silimate/l2j_frontend.cc: set_string_attribute(ID(area), std::to_string(area)); // e.g. "1.500000"
#
# The blackbox-area branch in stat.cc's hierarchy_builder() previously guarded
# on `attributes.at(ID::area).size() == 0` and read the value with `.as_int()`.
# A string-valued area Const has size() != 0, so the branch never ran, and even
# if it had, `.as_int()` reinterprets the raw bits instead of parsing "1.5".
# The fix guards on size() != 0 and parses the string area as a double.
#
# This test recreates exactly what the frontends produce (a blackbox module
# with a string `area` attribute) and checks that stat counts it. `-hierarchy`
# is used because the blackbox-area branch accounts the cell as a submodule,
# and only the hierarchical view reports submodule area.

read_rtlil << EOT
attribute \blackbox 1
attribute \area "1.500000"
module \blackbox_cell
  wire input 1 \A
  wire output 2 \Y
end

module \top
  wire input 1 \A
  wire output 2 \Y
  cell \blackbox_cell \inst
    connect \A \A
    connect \Y \Y
  end
end
EOT

# The single blackbox instance has area 1.5, so the top module's hierarchical
# chip area must be 1.5, reported as one submodule.
logger -expect log "Chip area for module '\\top': 1.500000" 1
logger -expect log "1.5.*blackbox_cell" 1
logger -expect-no-warnings
stat -hierarchy