Class: SeccompTools::Asm::Compiler

Inherits:
Object
  • Object
show all
Defined in:
lib/seccomp-tools/asm/compiler.rb

Overview

Compile seccomp rules.

Instance Method Summary collapse

Constructor Details

#initialize(source, filename, arch) ⇒ Compiler

Instantiate a SeccompTools::Asm::Compiler object.

Parameters:

  • source (String) —

    Input string.

  • filename (String?) —

    Only used in error messages.

  • arch (Symbol) —

    Architecture.



23
24
25
26
27
 
# File 'lib/seccomp-tools/asm/compiler.rb', line 23

def initialize(source, filename, arch)
  @scanner = Scanner.new(source, arch, filename:)
  @arch = arch
  @symbols = {}
end

Instance Method Details

#compile! ⇒ Array<SeccompTools::BPF>

Compiles the processed instructions.

Returns:

Raises:



35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
 
# File 'lib/seccomp-tools/asm/compiler.rb', line 35

def compile!
  @scanner.validate!
  statements = SeccompAsmParser.new(@scanner).parse
  fixup_symbols(statements)
  resolve_symbols(statements)

  statements.map.with_index do |s, idx|
    @line = idx
    case s.type
    when :alu then emit_alu(*s.data)
    when :assign then emit_assign(*s.data)
    when :if then emit_cmp(*s.data)
    when :ret then emit_ret(*s.data)
    end
  end
end