class AdLint::Exam::CBuiltin::W0745
Public Class Methods
new(phase_ctxt)
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Calls superclass method
AdLint::Examination::new
# File lib/adlint/exam/c_builtin/cc1_check.rb, line 18268 def initialize(phase_ctxt) super @interp = phase_ctxt[:cc1_interpreter] @interp.on_array_subscript_expr_evaled += T(:check_array_subscript) @interp.on_indirection_expr_evaled += T(:check_indirection) end
Private Instance Methods
check_array_subscript(expr, ary_or_ptr, subs, ary, *)
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# File lib/adlint/exam/c_builtin/cc1_check.rb, line 18276 def check_array_subscript(expr, ary_or_ptr, subs, ary, *) return unless ary unless constant_expression?(expr.array_subscript) warn_array_oob_access(expr.array_subscript, ary, subs) end end
check_indirection(expr, *)
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# File lib/adlint/exam/c_builtin/cc1_check.rb, line 18284 def check_indirection(expr, *) ary, subs_expr = extract_array_and_subscript(expr.operand) return unless ary unless constant_expression?(subs_expr) subs = interpret(subs_expr, QUIET, WITHOUT_SIDE_EFFECTS) warn_array_oob_access(expr.operand, ary, subs) end end
create_subscript_expr(expr, ary_name)
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# File lib/adlint/exam/c_builtin/cc1_check.rb, line 18335 def create_subscript_expr(expr, ary_name) expr.accept(ExpressionTransformer.new(ary_name)) end
extract_array(expr)
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# File lib/adlint/exam/c_builtin/cc1_check.rb, line 18319 def extract_array(expr) collect_object_specifiers(expr).each do |obj_spec| if obj = variable_named(obj_spec.identifier.value) case when obj.type.array? return obj, obj_spec.identifier.value when obj.type.pointer? if obj = pointee_of(obj) and obj.type.array? return obj, obj_spec.identifier.value end end end end nil end
extract_array_and_subscript(expr)
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# File lib/adlint/exam/c_builtin/cc1_check.rb, line 18313 def extract_array_and_subscript(expr) ary, ary_name = extract_array(expr) subs_expr = create_subscript_expr(expr, ary_name) return ary, subs_expr end
interpreter()
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# File lib/adlint/exam/c_builtin/cc1_check.rb, line 18339 def interpreter @interp end
warn_array_oob_access(expr, ary, subs)
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# File lib/adlint/exam/c_builtin/cc1_check.rb, line 18294 def warn_array_oob_access(expr, ary, subs) if ary_len = ary.type.length lower_bound = scalar_value_of(0) test = subs.value.test_must_be_less_than(lower_bound) if test.true? W(expr.location, *test.evidence.emit_context_messages(self, expr.location)) return end upper_bound = scalar_value_of(ary_len - 1) test = subs.value.test_must_be_greater_than(upper_bound) if test.true? W(expr.location, *test.evidence.emit_context_messages(self, expr.location)) end end end