From: Richard Henderson <richard.henderson@linaro.org>
Date: Sat, 19 Jun 2021 13:32:03 +0000 (-0700)
Subject: tcg: Restart when exhausting the stack frame
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=732d58979c9d6ab1b955b65264a15d0696ea477e;p=qemu.git

tcg: Restart when exhausting the stack frame

Assume that we'll have fewer temps allocated after
restarting with a fewer number of instructions.

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---

diff --git a/tcg/tcg.c b/tcg/tcg.c
index bdeea18234..5e53c3348f 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -3038,7 +3038,11 @@ static void temp_allocate_frame(TCGContext *s, TCGTemp *ts)
 
     assert(align <= TCG_TARGET_STACK_ALIGN);
     off = ROUND_UP(s->current_frame_offset, align);
-    assert(off + size <= s->frame_end);
+
+    /* If we've exhausted the stack frame, restart with a smaller TB. */
+    if (off + size > s->frame_end) {
+        tcg_raise_tb_overflow(s);
+    }
     s->current_frame_offset = off + size;
 
     ts->mem_offset = off;