From 813bc74be61e910d3fe9e013d0ee5cca1cce6fd0 Mon Sep 17 00:00:00 2001
From: Joshua Haberman <jhaberman@gmail.com>
Date: Wed, 6 Apr 2011 00:36:30 -0700
Subject: [PATCH] JIT now works on OS X!

Had to fix the case where the jump table was
allocated in a >4GB address.
---
 src/upb_decoder_x86.dasc | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/upb_decoder_x86.dasc b/src/upb_decoder_x86.dasc
index d3507197a0..fac0dcfcd0 100644
--- a/src/upb_decoder_x86.dasc
+++ b/src/upb_decoder_x86.dasc
@@ -184,7 +184,12 @@ void upb_reg_jit_gdb(void *addr, size_t size) {
 |  and  edx, 0x7
 |  cmp  ecx, m->max_field_number  // Bounds-check the field.
 |  ja   ->exit_jit                // In the future; could be unknown label
-|  mov  rax, qword [rcx*8 + m->tablearray]  // TODO: support hybrid array/hash tables.
+|| if ((uintptr_t)m->tablearray < 0xffffffff) {
+|    mov  rax, qword [rcx*8 + m->tablearray]  // TODO: support hybrid array/hash tables.
+|| } else {
+|    mov64  rax, (uintptr_t)m->tablearray
+|    mov  rax, qword [rax + rcx*8]
+|| }
 |  jmp  rax  // Dispatch: unpredictable jump.
 |.endmacro
 |