translator: merge max_insns into DisasContextBase

While at it, use int for both num_insns and max_insns to make
sure we have same-type comparisons.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Michael Clark <mjc@sifive.com>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

accel/tcg/translator.c

@@ -34,8 +34,6 @@ void translator_loop_temp_check(DisasContextBase *db)
 void translator_loop(const TranslatorOps *ops, DisasContextBase *db,
                      CPUState *cpu, TranslationBlock *tb)
 {
-    int max_insns;
-
     /* Initialize DisasContext */
     db->tb = tb;
     db->pc_first = tb->pc;
@@ -45,18 +43,18 @@ void translator_loop(const TranslatorOps *ops, DisasContextBase *db,
     db->singlestep_enabled = cpu->singlestep_enabled;
 
     /* Instruction counting */
-    max_insns = tb_cflags(db->tb) & CF_COUNT_MASK;
-    if (max_insns == 0) {
-        max_insns = CF_COUNT_MASK;
+    db->max_insns = tb_cflags(db->tb) & CF_COUNT_MASK;
+    if (db->max_insns == 0) {
+        db->max_insns = CF_COUNT_MASK;
     }
-    if (max_insns > TCG_MAX_INSNS) {
-        max_insns = TCG_MAX_INSNS;
+    if (db->max_insns > TCG_MAX_INSNS) {
+        db->max_insns = TCG_MAX_INSNS;
     }
     if (db->singlestep_enabled || singlestep) {
-        max_insns = 1;
+        db->max_insns = 1;
     }
 
-    max_insns = ops->init_disas_context(db, cpu, max_insns);
+    ops->init_disas_context(db, cpu);
     tcg_debug_assert(db->is_jmp == DISAS_NEXT);  /* no early exit */
 
     /* Reset the temp count so that we can identify leaks */
@@ -95,7 +93,8 @@ void translator_loop(const TranslatorOps *ops, DisasContextBase *db,
            update db->pc_next and db->is_jmp to indicate what should be
            done next -- either exiting this loop or locate the start of
            the next instruction.  */
-        if (db->num_insns == max_insns && (tb_cflags(db->tb) & CF_LAST_IO)) {
+        if (db->num_insns == db->max_insns
+            && (tb_cflags(db->tb) & CF_LAST_IO)) {
             /* Accept I/O on the last instruction.  */
             gen_io_start();
             ops->translate_insn(db, cpu);
@@ -111,7 +110,7 @@ void translator_loop(const TranslatorOps *ops, DisasContextBase *db,
 
         /* Stop translation if the output buffer is full,
            or we have executed all of the allowed instructions.  */
-        if (tcg_op_buf_full() || db->num_insns >= max_insns) {
+        if (tcg_op_buf_full() || db->num_insns >= db->max_insns) {
             db->is_jmp = DISAS_TOO_MANY;
             break;
         }

include/exec/translator.h

@@ -58,6 +58,7 @@ typedef enum DisasJumpType {
  *           disassembly).
  * @is_jmp: What instruction to disassemble next.
  * @num_insns: Number of translated instructions (including current).
+ * @max_insns: Maximum number of instructions to be translated in this TB.
  * @singlestep_enabled: "Hardware" single stepping enabled.
  *
  * Architecture-agnostic disassembly context.
@@ -67,7 +68,8 @@ typedef struct DisasContextBase {
     target_ulong pc_first;
     target_ulong pc_next;
     DisasJumpType is_jmp;
-    unsigned int num_insns;
+    int num_insns;
+    int max_insns;
     bool singlestep_enabled;
 } DisasContextBase;
 
@@ -76,7 +78,6 @@ typedef struct DisasContextBase {
  * @init_disas_context:
  *      Initialize the target-specific portions of DisasContext struct.
  *      The generic DisasContextBase has already been initialized.
- *      Return max_insns, modified as necessary by db->tb->flags.
  *
  * @tb_start:
  *      Emit any code required before the start of the main loop,
@@ -106,8 +107,7 @@ typedef struct DisasContextBase {
  *      Print instruction disassembly to log.
  */
 typedef struct TranslatorOps {
-    int (*init_disas_context)(DisasContextBase *db, CPUState *cpu,
-                              int max_insns);
+    void (*init_disas_context)(DisasContextBase *db, CPUState *cpu);
     void (*tb_start)(DisasContextBase *db, CPUState *cpu);
     void (*insn_start)(DisasContextBase *db, CPUState *cpu);
     bool (*breakpoint_check)(DisasContextBase *db, CPUState *cpu,

target/alpha/translate.c

@@ -2919,8 +2919,7 @@ static DisasJumpType translate_one(DisasContext *ctx, uint32_t insn)
     return ret;
 }
 
-static int alpha_tr_init_disas_context(DisasContextBase *dcbase,
-                                       CPUState *cpu, int max_insns)
+static void alpha_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cpu)
 {
     DisasContext *ctx = container_of(dcbase, DisasContext, base);
     CPUAlphaState *env = cpu->env_ptr;
@@ -2959,8 +2958,7 @@ static int alpha_tr_init_disas_context(DisasContextBase *dcbase,
         mask = TARGET_PAGE_MASK;
     }
     bound = -(ctx->base.pc_first | mask) / 4;
-
-    return MIN(max_insns, bound);
+    ctx->base.max_insns = MIN(ctx->base.max_insns, bound);
 }
 
 static void alpha_tr_tb_start(DisasContextBase *db, CPUState *cpu)

target/arm/translate-a64.c

@@ -13224,8 +13224,8 @@ static void disas_a64_insn(CPUARMState *env, DisasContext *s)
     free_tmp_a64(s);
 }
 
-static int aarch64_tr_init_disas_context(DisasContextBase *dcbase,
-                                         CPUState *cpu, int max_insns)
+static void aarch64_tr_init_disas_context(DisasContextBase *dcbase,
+                                          CPUState *cpu)
 {
     DisasContext *dc = container_of(dcbase, DisasContext, base);
     CPUARMState *env = cpu->env_ptr;
@@ -13288,11 +13288,9 @@ static int aarch64_tr_init_disas_context(DisasContextBase *dcbase,
     if (dc->ss_active) {
         bound = 1;
     }
-    max_insns = MIN(max_insns, bound);
+    dc->base.max_insns = MIN(dc->base.max_insns, bound);
 
     init_tmp_a64_array(dc);
-
-    return max_insns;
 }
 
 static void aarch64_tr_tb_start(DisasContextBase *db, CPUState *cpu)

target/arm/translate.c

@@ -12243,8 +12243,7 @@ static bool insn_crosses_page(CPUARMState *env, DisasContext *s)
     return !thumb_insn_is_16bit(s, insn);
 }
 
-static int arm_tr_init_disas_context(DisasContextBase *dcbase,
-                                     CPUState *cs, int max_insns)
+static void arm_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
 {
     DisasContext *dc = container_of(dcbase, DisasContext, base);
     CPUARMState *env = cs->env_ptr;
@@ -12305,14 +12304,14 @@ static int arm_tr_init_disas_context(DisasContextBase *dcbase,
 
     /* If architectural single step active, limit to 1.  */
     if (is_singlestepping(dc)) {
-        max_insns = 1;
+        dc->base.max_insns = 1;
     }
 
     /* ARM is a fixed-length ISA.  Bound the number of insns to execute
        to those left on the page.  */
     if (!dc->thumb) {
         int bound = -(dc->base.pc_first | TARGET_PAGE_MASK) / 4;
-        max_insns = MIN(max_insns, bound);
+        dc->base.max_insns = MIN(dc->base.max_insns, bound);
     }
 
     cpu_F0s = tcg_temp_new_i32();
@@ -12323,8 +12322,6 @@ static int arm_tr_init_disas_context(DisasContextBase *dcbase,
     cpu_V1 = cpu_F1d;
     /* FIXME: cpu_M0 can probably be the same as cpu_V0.  */
     cpu_M0 = tcg_temp_new_i64();
-
-    return max_insns;
 }
 
 static void arm_tr_tb_start(DisasContextBase *dcbase, CPUState *cpu)

target/hppa/translate.c

@@ -4669,8 +4669,7 @@ static DisasJumpType translate_one(DisasContext *ctx, uint32_t insn)
     return gen_illegal(ctx);
 }
 
-static int hppa_tr_init_disas_context(DisasContextBase *dcbase,
-                                      CPUState *cs, int max_insns)
+static void hppa_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
 {
     DisasContext *ctx = container_of(dcbase, DisasContext, base);
     int bound;
@@ -4700,14 +4699,12 @@ static int hppa_tr_init_disas_context(DisasContextBase *dcbase,
 
     /* Bound the number of instructions by those left on the page.  */
     bound = -(ctx->base.pc_first | TARGET_PAGE_MASK) / 4;
-    bound = MIN(max_insns, bound);
+    ctx->base.max_insns = MIN(ctx->base.max_insns, bound);
 
     ctx->ntempr = 0;
     ctx->ntempl = 0;
     memset(ctx->tempr, 0, sizeof(ctx->tempr));
     memset(ctx->templ, 0, sizeof(ctx->templ));
-
-    return bound;
 }
 
 static void hppa_tr_tb_start(DisasContextBase *dcbase, CPUState *cs)

target/i386/translate.c

@@ -8402,8 +8402,7 @@ void tcg_x86_init(void)
     }
 }
 
-static int i386_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cpu,
-                                      int max_insns)
+static void i386_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cpu)
 {
     DisasContext *dc = container_of(dcbase, DisasContext, base);
     CPUX86State *env = cpu->env_ptr;
@@ -8470,8 +8469,6 @@ static int i386_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cpu,
     cpu_ptr0 = tcg_temp_new_ptr();
     cpu_ptr1 = tcg_temp_new_ptr();
     cpu_cc_srcT = tcg_temp_local_new();
-
-    return max_insns;
 }
 
 static void i386_tr_tb_start(DisasContextBase *db, CPUState *cpu)

target/ppc/translate.c

@@ -7215,8 +7215,7 @@ void ppc_cpu_dump_statistics(CPUState *cs, FILE*f,
 #endif
 }
 
-static int ppc_tr_init_disas_context(DisasContextBase *dcbase,
-                                     CPUState *cs, int max_insns)
+static void ppc_tr_init_disas_context(DisasContextBase *dcbase, CPUState *cs)
 {
     DisasContext *ctx = container_of(dcbase, DisasContext, base);
     CPUPPCState *env = cs->env_ptr;
@@ -7281,7 +7280,7 @@ static int ppc_tr_init_disas_context(DisasContextBase *dcbase,
 #endif
 
     bound = -(ctx->base.pc_first | TARGET_PAGE_MASK) / 4;
-    return MIN(max_insns, bound);
+    ctx->base.max_insns = MIN(ctx->base.max_insns, bound);
 }
 
 static void ppc_tr_tb_start(DisasContextBase *db, CPUState *cs)