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X-Received-From: 2607:f8b0:4864:20::62d Subject: [Qemu-devel] [PULL 1/4] tcg: Diagnose referenced labels that have not been emitted X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: peter.maydell@linaro.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Currently, a jump to a label that is not defined anywhere will be emitted not be relocated. This results in a jump to a random jump target. With tcg debugging, print a diagnostic to the -d op file and abort. This could help debug or detect errors like c2d9644e6d ("target/arm: Fix crash on conditional instruction in an IT bloc= k") Reported-by: Roman Kapl Reviewed-by: Philippe Mathieu-Daud=C3=A9 Signed-off-by: Richard Henderson --- tcg/tcg-op.h | 1 + tcg/tcg.h | 12 +++++++++--- tcg/tcg.c | 23 +++++++++++++++++++++++ 3 files changed, 33 insertions(+), 3 deletions(-) diff --git a/tcg/tcg-op.h b/tcg/tcg-op.h index 2d98868d8f..d3e51b15af 100644 --- a/tcg/tcg-op.h +++ b/tcg/tcg-op.h @@ -255,6 +255,7 @@ static inline void tcg_gen_op6ii_i64(TCGOpcode opc, TCG= v_i64 a1, TCGv_i64 a2, =20 static inline void gen_set_label(TCGLabel *l) { + l->present =3D 1; tcg_gen_op1(INDEX_op_set_label, label_arg(l)); } =20 diff --git a/tcg/tcg.h b/tcg/tcg.h index 045c24a357..32b7cf3489 100644 --- a/tcg/tcg.h +++ b/tcg/tcg.h @@ -244,16 +244,21 @@ typedef struct TCGRelocation { intptr_t addend; } TCGRelocation;=20 =20 -typedef struct TCGLabel { +typedef struct TCGLabel TCGLabel; +struct TCGLabel { + unsigned present : 1; unsigned has_value : 1; - unsigned id : 15; + unsigned id : 14; unsigned refs : 16; union { uintptr_t value; tcg_insn_unit *value_ptr; TCGRelocation *first_reloc; } u; -} TCGLabel; +#ifdef CONFIG_DEBUG_TCG + QSIMPLEQ_ENTRY(TCGLabel) next; +#endif +}; =20 typedef struct TCGPool { struct TCGPool *next; @@ -685,6 +690,7 @@ struct TCGContext { #endif =20 #ifdef CONFIG_DEBUG_TCG + QSIMPLEQ_HEAD(, TCGLabel) labels; int temps_in_use; int goto_tb_issue_mask; #endif diff --git a/tcg/tcg.c b/tcg/tcg.c index 20a5d8f315..9b2bf7f439 100644 --- a/tcg/tcg.c +++ b/tcg/tcg.c @@ -305,6 +305,9 @@ TCGLabel *gen_new_label(void) *l =3D (TCGLabel){ .id =3D s->nb_labels++ }; +#ifdef CONFIG_DEBUG_TCG + QSIMPLEQ_INSERT_TAIL(&s->labels, l, next); +#endif =20 return l; } @@ -1092,6 +1095,9 @@ void tcg_func_start(TCGContext *s) =20 QTAILQ_INIT(&s->ops); QTAILQ_INIT(&s->free_ops); +#ifdef CONFIG_DEBUG_TCG + QSIMPLEQ_INIT(&s->labels); +#endif } =20 static inline TCGTemp *tcg_temp_alloc(TCGContext *s) @@ -3841,6 +3847,23 @@ int tcg_gen_code(TCGContext *s, TranslationBlock *tb) } #endif =20 +#ifdef CONFIG_DEBUG_TCG + /* Ensure all labels referenced have been emitted. */ + { + TCGLabel *l; + bool error =3D false; + + QSIMPLEQ_FOREACH(l, &s->labels, next) { + if (unlikely(!l->present) && l->refs) { + qemu_log_mask(CPU_LOG_TB_OP, + "$L%d referenced but not present.\n", l->id); + error =3D true; + } + } + assert(!error); + } +#endif + #ifdef CONFIG_PROFILER atomic_set(&prof->opt_time, prof->opt_time - profile_getclock()); #endif --=20 2.17.2