From c96c0f94f964eab1b57b7f6081e3538cd611e963 Mon Sep 17 00:00:00 2001 From: Vijay Pai Date: Wed, 19 Apr 2017 15:39:13 -0700 Subject: [PATCH] Remove DEBUG code that is itself buggy (integer overflow) --- src/core/lib/support/stack_lockfree.c | 33 --------------------------- 1 file changed, 33 deletions(-) diff --git a/src/core/lib/support/stack_lockfree.c b/src/core/lib/support/stack_lockfree.c index 9d7c9e5a381..c481a3e0dc5 100644 --- a/src/core/lib/support/stack_lockfree.c +++ b/src/core/lib/support/stack_lockfree.c @@ -72,11 +72,6 @@ typedef union lockfree_node { struct gpr_stack_lockfree { lockfree_node *entries; lockfree_node head; /* An atomic entry describing curr head */ - -#ifndef NDEBUG - /* Bitmap of pushed entries to check for double-push or pop */ - gpr_atm pushed[(INVALID_ENTRY_INDEX + 1) / (8 * sizeof(gpr_atm))]; -#endif }; gpr_stack_lockfree *gpr_stack_lockfree_create(size_t entries) { @@ -91,9 +86,6 @@ gpr_stack_lockfree *gpr_stack_lockfree_create(size_t entries) { /* Clear out all entries */ memset(stack->entries, 0, entries * sizeof(stack->entries[0])); memset(&stack->head, 0, sizeof(stack->head)); -#ifndef NDEBUG - memset(&stack->pushed, 0, sizeof(stack->pushed)); -#endif GPR_ASSERT(sizeof(stack->entries->atm) == sizeof(stack->entries->contents)); @@ -130,19 +122,6 @@ int gpr_stack_lockfree_push(gpr_stack_lockfree *stack, int entry) { newhead.contents.aba_ctr = ++curent.contents.aba_ctr; gpr_atm_no_barrier_store(&stack->entries[entry].atm, curent.atm); -#ifndef NDEBUG - /* Check for double push */ - { - int pushed_index = entry / (int)(8 * sizeof(gpr_atm)); - int pushed_bit = entry % (int)(8 * sizeof(gpr_atm)); - gpr_atm old_val; - - old_val = gpr_atm_no_barrier_fetch_add(&stack->pushed[pushed_index], - ((gpr_atm)1 << pushed_bit)); - GPR_ASSERT((old_val & (((gpr_atm)1) << pushed_bit)) == 0); - } -#endif - do { /* Atomically get the existing head value for use */ head.atm = gpr_atm_no_barrier_load(&(stack->head.atm)); @@ -168,18 +147,6 @@ int gpr_stack_lockfree_pop(gpr_stack_lockfree *stack) { gpr_atm_no_barrier_load(&(stack->entries[head.contents.index].atm)); } while (!gpr_atm_no_barrier_cas(&(stack->head.atm), head.atm, newhead.atm)); -#ifndef NDEBUG - /* Check for valid pop */ - { - int pushed_index = head.contents.index / (8 * sizeof(gpr_atm)); - int pushed_bit = head.contents.index % (8 * sizeof(gpr_atm)); - gpr_atm old_val; - - old_val = gpr_atm_no_barrier_fetch_add(&stack->pushed[pushed_index], - -((gpr_atm)1 << pushed_bit)); - GPR_ASSERT((old_val & (((gpr_atm)1) << pushed_bit)) != 0); - } -#endif return head.contents.index; }