From b17e123a8f20239e8e1fc6816ccf115d9ec57471 Mon Sep 17 00:00:00 2001
From: Keith Whitwell <keith@tungstengraphics.com>
Date: Mon, 21 Apr 2008 19:09:38 +0100
Subject: [PATCH] rtasm: propogate errors in x86 emit

---
 src/gallium/auxiliary/rtasm/rtasm_x86sse.c | 34 ++++++++++++++++++----
 src/gallium/auxiliary/rtasm/rtasm_x86sse.h |  1 +
 2 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/src/gallium/auxiliary/rtasm/rtasm_x86sse.c b/src/gallium/auxiliary/rtasm/rtasm_x86sse.c
index f2c08c96a6f..c2fe0e40f57 100644
--- a/src/gallium/auxiliary/rtasm/rtasm_x86sse.c
+++ b/src/gallium/auxiliary/rtasm/rtasm_x86sse.c
@@ -146,7 +146,10 @@ _fill(
 
 static void do_realloc( struct x86_function *p )
 {
-   if (p->size == 0) {
+   if (p->store == p->error_overflow) {
+      p->csr = p->store;
+   }
+   else if (p->size == 0) {
       p->size = 1024;
       p->store = rtasm_exec_malloc(p->size);
       p->csr = p->store;
@@ -156,10 +159,22 @@ static void do_realloc( struct x86_function *p )
       unsigned char *tmp = p->store;
       p->size *= 2;
       p->store = rtasm_exec_malloc(p->size);
-      memcpy(p->store, tmp, used);
-      p->csr = p->store + used;
+
+      if (p->store) {
+         memcpy(p->store, tmp, used);
+         p->csr = p->store + used;
+      }
+      else {
+         p->csr = p->store;
+      }
+
       rtasm_exec_free(tmp);
    }
+
+   if (p->store == NULL) {
+      p->store = p->csr = p->error_overflow;
+      p->size = 4;
+   }
 }
 
 /* Emit bytes to the instruction stream:
@@ -1440,12 +1455,17 @@ void x86_init_func_size( struct x86_function *p, unsigned code_size )
 {
    p->size = code_size;
    p->store = rtasm_exec_malloc(code_size);
+   if (p->store == NULL) {
+      p->store = p->error_overflow;
+   }
    p->csr = p->store;
 }
 
 void x86_release_func( struct x86_function *p )
 {
-   rtasm_exec_free(p->store);
+   if (p->store && p->store != p->error_overflow)
+      rtasm_exec_free(p->store);
+
    p->store = NULL;
    p->csr = NULL;
    p->size = 0;
@@ -1456,7 +1476,11 @@ void (*x86_get_func( struct x86_function *p ))(void)
 {
    if (DISASSEM && p->store)
       debug_printf("disassemble %p %p\n", p->store, p->csr);
-   return (void (*)(void)) p->store;
+
+   if (p->store == p->error_overflow)
+      return (void (*)(void)) NULL;
+   else
+      return (void (*)(void)) p->store;
 }
 
 #else
diff --git a/src/gallium/auxiliary/rtasm/rtasm_x86sse.h b/src/gallium/auxiliary/rtasm/rtasm_x86sse.h
index 5e99ceea706..695a1cef4e3 100644
--- a/src/gallium/auxiliary/rtasm/rtasm_x86sse.h
+++ b/src/gallium/auxiliary/rtasm/rtasm_x86sse.h
@@ -43,6 +43,7 @@ struct x86_function {
    unsigned char *csr;
    unsigned stack_offset;
    int need_emms;
+   unsigned char error_overflow[4];
    const char *fn;
 };
 
-- 
2.30.2