Fix alloca on x86_64 windows

herman ten brugge committed 6 years ago

Commit 426d32a1 parent a0bc1492 files · +12 −3Browse files

Unified · Split

2 files

 __bound_alloca:
 #ifdef _WIN32
-    # bound checking is not implemented
     pop     %rdx
     mov     %rcx,%rax
     add     $15,%rax
     sub     %rax,%rsp
     mov     %rsp,%rax
-    add     $32,%rax
+    push    %rdx
+    push    %rax
+    mov     %rcx,%rdx
+    mov     %rax,%rcx
+    sub     $20,%rsp
+    call   __bound_new_region
+    add     $20,%rsp
+    pop     %rax
+    pop     %rdx
+    add     $32,%rax
 p3:
     push    %rdx
     ret

@@ -1025,7 +1025,7 @@ void gfunc_call(int nb_args) · 1024 unmodified lines
1025		1025
1026	if ((vtop->r & VT_SYM) && vtop->sym->v == TOK_alloca) {	1026	if ((vtop->r & VT_SYM) && vtop->sym->v == TOK_alloca) {
1027	/* need to add the "func_scratch" area after alloca */	1027	/* need to add the "func_scratch" area after alloca */
1028	o(0x48); func_alloca = oad(0x05, func_alloca); /* sub $NN, %rax */	1028	o(0x48); func_alloca = oad(0x2d, func_alloca); /* sub $NN, %rax */
1029	}	1029	}
1030		1030
1031	/* other compilers don't clear the upper bits when returning char/short */	1031	/* other compilers don't clear the upper bits when returning char/short */

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