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[03/18] TCG: remove broken stack allocation for call arguments

Message ID BANLkTi=ArOLcLGWeZoNW5zx6Ev2tk9yYoQ@mail.gmail.com
State New
Headers show

Commit Message

Blue Swirl June 19, 2011, 9:04 p.m. UTC 
The code for stack allocation for call arguments is way too simplistic
to actually work on targets with non-trivial stack allocation policies,
e.g. ppc64. We've also already allocated TCG_STATIC_CALL_ARGS_SIZE worth
of stack for calls which should be well more than any helper needs.

Remove broken dynamic stack allocation code and replace it with an assert.
Should dynamic stack allocation ever be needed again, target specific
functions should be added.

Thanks to Richard Henderson for the analysis.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
---
 tcg/tcg.c |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)

     stack_offset = TCG_TARGET_CALL_STACK_OFFSET;
@@ -1970,10 +1971,6 @@ static int tcg_reg_alloc_call(TCGContext *s,
const TCGOpDef *def,
     }

     tcg_out_op(s, opc, &func_arg, &const_func_arg);
-
-    if (allocate_args) {
-        tcg_out_addi(s, TCG_REG_CALL_STACK, STACK_DIR(call_stack_size));
-    }

     /* assign output registers and emit moves if needed */
     for(i = 0; i < nb_oargs; i++) {
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Patch

diff --git a/tcg/tcg.c b/tcg/tcg.c
index d8bf721..29cd7a2 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -1845,13 +1845,14 @@  static int tcg_reg_alloc_call(TCGContext *s,
const TCGOpDef *def,
         nb_regs = nb_params;

     /* assign stack slots first */
-    /* XXX: preallocate call stack */
     call_stack_size = (nb_params - nb_regs) * sizeof(tcg_target_long);
     call_stack_size = (call_stack_size + TCG_TARGET_STACK_ALIGN - 1) &
         ~(TCG_TARGET_STACK_ALIGN - 1);
     allocate_args = (call_stack_size > TCG_STATIC_CALL_ARGS_SIZE);
     if (allocate_args) {
-        tcg_out_addi(s, TCG_REG_CALL_STACK, -STACK_DIR(call_stack_size));
+        /* XXX: if more than TCG_STATIC_CALL_ARGS_SIZE is needed,
+           preallocate call stack */
+        tcg_abort();
     }