py/asm: Remove need for dummy_data when doing initial assembler passes.

For all but the last pass the assembler only needs to count how much space
is needed for the machine code, it doesn't actually need to emit anything.
The dummy_data just uses unnecessary RAM and without it the code is not
any more complex (and code size does not increase for Thumb and Xtensa
archs).

1 files changed, 22 insertions, 14 deletions

diff --git a/py/asmx86.c b/py/asmx86.c
index cb9b30d40..ef315bf43 100644
--- a/py/asmx86.c
+++ b/py/asmx86.c
@@ -101,29 +101,37 @@
 #define SIGNED_FIT8(x) (((x) & 0xffffff80) == 0) || (((x) & 0xffffff80) == 0xffffff80)
 
 STATIC void asm_x86_write_byte_1(asm_x86_t *as, byte b1) {
-    byte* c = asm_x86_get_cur_to_write_bytes(as, 1);
-    c[0] = b1;
+    byte* c = mp_asm_base_get_cur_to_write_bytes(&as->base, 1);
+    if (c != NULL) {
+        c[0] = b1;
+    }
 }
 
 STATIC void asm_x86_write_byte_2(asm_x86_t *as, byte b1, byte b2) {
-    byte* c = asm_x86_get_cur_to_write_bytes(as, 2);
-    c[0] = b1;
-    c[1] = b2;
+    byte* c = mp_asm_base_get_cur_to_write_bytes(&as->base, 2);
+    if (c != NULL) {
+        c[0] = b1;
+        c[1] = b2;
+    }
 }
 
 STATIC void asm_x86_write_byte_3(asm_x86_t *as, byte b1, byte b2, byte b3) {
-    byte* c = asm_x86_get_cur_to_write_bytes(as, 3);
-    c[0] = b1;
-    c[1] = b2;
-    c[2] = b3;
+    byte* c = mp_asm_base_get_cur_to_write_bytes(&as->base, 3);
+    if (c != NULL) {
+        c[0] = b1;
+        c[1] = b2;
+        c[2] = b3;
+    }
 }
 
 STATIC void asm_x86_write_word32(asm_x86_t *as, int w32) {
-    byte* c = asm_x86_get_cur_to_write_bytes(as, 4);
-    c[0] = IMM32_L0(w32);
-    c[1] = IMM32_L1(w32);
-    c[2] = IMM32_L2(w32);
-    c[3] = IMM32_L3(w32);
+    byte* c = mp_asm_base_get_cur_to_write_bytes(&as->base, 4);
+    if (c != NULL) {
+        c[0] = IMM32_L0(w32);
+        c[1] = IMM32_L1(w32);
+        c[2] = IMM32_L2(w32);
+        c[3] = IMM32_L3(w32);
+    }
 }
 
 STATIC void asm_x86_write_r32_disp(asm_x86_t *as, int r32, int disp_r32, int disp_offset) {