qemu/include/exec/tb-lookup.h
Stefan Hajnoczi d73415a315 qemu/atomic.h: rename atomic_ to qatomic_
clang's C11 atomic_fetch_*() functions only take a C11 atomic type
pointer argument. QEMU uses direct types (int, etc) and this causes a
compiler error when a QEMU code calls these functions in a source file
that also included <stdatomic.h> via a system header file:

  $ CC=clang CXX=clang++ ./configure ... && make
  ../util/async.c:79:17: error: address argument to atomic operation must be a pointer to _Atomic type ('unsigned int *' invalid)

Avoid using atomic_*() names in QEMU's atomic.h since that namespace is
used by <stdatomic.h>. Prefix QEMU's APIs with 'q' so that atomic.h
and <stdatomic.h> can co-exist. I checked /usr/include on my machine and
searched GitHub for existing "qatomic_" users but there seem to be none.

This patch was generated using:

  $ git grep -h -o '\<atomic\(64\)\?_[a-z0-9_]\+' include/qemu/atomic.h | \
    sort -u >/tmp/changed_identifiers
  $ for identifier in $(</tmp/changed_identifiers); do
        sed -i "s%\<$identifier\>%q$identifier%g" \
            $(git grep -I -l "\<$identifier\>")
    done

I manually fixed line-wrap issues and misaligned rST tables.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20200923105646.47864-1-stefanha@redhat.com>
2020-09-23 16:07:44 +01:00

52 lines
1.4 KiB
C

/*
* Copyright (C) 2017, Emilio G. Cota <cota@braap.org>
*
* License: GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#ifndef EXEC_TB_LOOKUP_H
#define EXEC_TB_LOOKUP_H
#ifdef NEED_CPU_H
#include "cpu.h"
#else
#include "exec/poison.h"
#endif
#include "exec/exec-all.h"
#include "exec/tb-hash.h"
/* Might cause an exception, so have a longjmp destination ready */
static inline TranslationBlock *
tb_lookup__cpu_state(CPUState *cpu, target_ulong *pc, target_ulong *cs_base,
uint32_t *flags, uint32_t cf_mask)
{
CPUArchState *env = (CPUArchState *)cpu->env_ptr;
TranslationBlock *tb;
uint32_t hash;
cpu_get_tb_cpu_state(env, pc, cs_base, flags);
hash = tb_jmp_cache_hash_func(*pc);
tb = qatomic_rcu_read(&cpu->tb_jmp_cache[hash]);
cf_mask &= ~CF_CLUSTER_MASK;
cf_mask |= cpu->cluster_index << CF_CLUSTER_SHIFT;
if (likely(tb &&
tb->pc == *pc &&
tb->cs_base == *cs_base &&
tb->flags == *flags &&
tb->trace_vcpu_dstate == *cpu->trace_dstate &&
(tb_cflags(tb) & (CF_HASH_MASK | CF_INVALID)) == cf_mask)) {
return tb;
}
tb = tb_htable_lookup(cpu, *pc, *cs_base, *flags, cf_mask);
if (tb == NULL) {
return NULL;
}
qatomic_set(&cpu->tb_jmp_cache[hash], tb);
return tb;
}
#endif /* EXEC_TB_LOOKUP_H */