pass-lang/src/asm.c

/// This file handles the contextual generation of machine code.
/// It abstracts over quirks like the limitations of addressing modes,
/// provides higher-level functionality, and can perform peephole optimization.
///
/// Reserved registers:
///
///   * rsp: the stack pointer
///   * rbp: the base of the stack frame
///   * rax: the top of the stack
///   * r13: a scratch register for compound instructions

#include "asm.h"
#include "io.h"

#include <stdlib.h>
#include <string.h>

void inst_jump(ip there) {
    x86_inst_jmp_disp((int32_t) (there - here));
    // TODO: support 64-bit jumps?
}

ip inst_jump_unresolved(void) {
    x86_inst_jmp_disp32(0);
    return here;
}

void inst_jump_resolve(ip disp, ip there) {
    patch_i32(disp - 4, (int32_t) (there - here));
}