Module: JITBuffer::MMAP

Includes:
Fiddle
Defined in:
lib/jit_buffer.rb

Constant Summary collapse

PROT_READ = 
0x01
PROT_WRITE = 
0x02
PROT_EXEC = 
0x04
MAP_SHARED = 
0x01
MAP_PRIVATE = 
0x02
MAP_ANON = 
0x20
MAP_JIT = 
0x0

Class Method Summary collapse

Class Method Details

.make_function(name, args, ret) ⇒ Object 



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# File 'lib/jit_buffer.rb', line 40

def self.make_function name, args, ret
  ptr = Handle::DEFAULT[name]
  func = Function.new ptr, args, ret, name: name
  define_singleton_method name, &func.to_proc
end

.mmap_buffer(size) ⇒ Object 



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# File 'lib/jit_buffer.rb', line 65

def self.mmap_buffer size
  ptr = mmap 0, size, PROT_READ | PROT_WRITE | PROT_EXEC, MAP_PRIVATE | MAP_ANON | MAP_JIT, -1, 0
  ptr.size = size
  ptr
end

.set_executable(ptr, size) ⇒ Object 



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# File 'lib/jit_buffer.rb', line 77

def self.set_executable ptr, size
  MMAP.pthread_jit_write_protect_np 1
  MMAP.sys_icache_invalidate ptr, size
end

.set_writeable(ptr, size) ⇒ Object

Linux



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# File 'lib/jit_buffer.rb', line 73

def self.set_writeable ptr, _
  MMAP.pthread_jit_write_protect_np 0
end