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+---
+title: "Just-in-time compilation"
+date: 2018-12-05T17:45:53+03:00
+draft: false
+outputs: ["Reveal"]
+---
+# Just-in-time compilation
+
+---
+
+### Why
+
+- Interpreter are slow
+- Flexibility
+- Optimization
+
+---
+
+### What we need
+
+- Executable memory
+- Generate code
+- Execute code
+
+---
+
+### Executable memory
+- Why
+- Security concerns
+
+### Create executable memory Linux
+
+virtualCodeAddress = mmap(
+       NULL,
+       codeBytes,
+       PROT_READ | PROT_WRITE | PROT_EXEC,
+       MAP_ANONYMOUS | MAP_PRIVATE,
+       0,
+       0);
+
+---
+### Create executable memory Windows
+
+    auto const buffer = VirtualAlloc(nullptr, page_size, MEM_COMMIT, PAGE_READWRITE);
+    VirtualProtect(buffer, code.size(), PAGE_EXECUTE_READ, &dummy);
+
+---
+### Create executable memory other platforms
+
+- Consolse
+- Mobile
+- Pic
+
+---
+
+### How to create and execute code
+   typedef unsigned (*asmFunc)(void);
+   ....
+   unsigned char * memory = (unsigned char *) (virtualCodeAddress);
+   // mov %rdi, %rax
+   memory[i++] = 0x48;           // REX.W prefix
+   memory[i++] = 0x8b;           // MOV opcode, register/register
+   memory[i++] = 0xc7;           // MOD/RM byte for %rdi -> %rax
+   // ret
+   memory[i++] = 0xc3;           // RET opcode
+   ((asmFunc) (virtualCodeAddress))();
+---
+
+### Calling convention
+
+- Standart
+- Custom
+
+# ?