tcg/tci: Push const down through bytecode reading

Reviewed-by: Joelle van Dyne <j@getutm.app>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

1 files changed, 34 insertions, 26 deletions

diff --git a/tcg/tci.c b/tcg/tci.c
index 017887bbc9..2bcc4409be 100644
--- a/tcg/tci.c
+++ b/tcg/tci.c
@@ -164,34 +164,34 @@ static uint64_t tci_uint64(uint32_t high, uint32_t low)
 #endif
 
 /* Read constant (native size) from bytecode. */
-static tcg_target_ulong tci_read_i(uint8_t **tb_ptr)
+static tcg_target_ulong tci_read_i(const uint8_t **tb_ptr)
 {
-    tcg_target_ulong value = *(tcg_target_ulong *)(*tb_ptr);
+    tcg_target_ulong value = *(const tcg_target_ulong *)(*tb_ptr);
     *tb_ptr += sizeof(value);
     return value;
 }
 
 /* Read unsigned constant (32 bit) from bytecode. */
-static uint32_t tci_read_i32(uint8_t **tb_ptr)
+static uint32_t tci_read_i32(const uint8_t **tb_ptr)
 {
-    uint32_t value = *(uint32_t *)(*tb_ptr);
+    uint32_t value = *(const uint32_t *)(*tb_ptr);
     *tb_ptr += sizeof(value);
     return value;
 }
 
 /* Read signed constant (32 bit) from bytecode. */
-static int32_t tci_read_s32(uint8_t **tb_ptr)
+static int32_t tci_read_s32(const uint8_t **tb_ptr)
 {
-    int32_t value = *(int32_t *)(*tb_ptr);
+    int32_t value = *(const int32_t *)(*tb_ptr);
     *tb_ptr += sizeof(value);
     return value;
 }
 
 #if TCG_TARGET_REG_BITS == 64
 /* Read constant (64 bit) from bytecode. */
-static uint64_t tci_read_i64(uint8_t **tb_ptr)
+static uint64_t tci_read_i64(const uint8_t **tb_ptr)
 {
-    uint64_t value = *(uint64_t *)(*tb_ptr);
+    uint64_t value = *(const uint64_t *)(*tb_ptr);
     *tb_ptr += sizeof(value);
     return value;
 }
@@ -199,7 +199,7 @@ static uint64_t tci_read_i64(uint8_t **tb_ptr)
 
 /* Read indexed register (native size) from bytecode. */
 static tcg_target_ulong
-tci_read_r(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+tci_read_r(const tcg_target_ulong *regs, const uint8_t **tb_ptr)
 {
     tcg_target_ulong value = tci_read_reg(regs, **tb_ptr);
     *tb_ptr += 1;
@@ -207,7 +207,7 @@ tci_read_r(const tcg_target_ulong *regs, uint8_t **tb_ptr)
 }
 
 /* Read indexed register (8 bit) from bytecode. */
-static uint8_t tci_read_r8(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+static uint8_t tci_read_r8(const tcg_target_ulong *regs, const uint8_t **tb_ptr)
 {
     uint8_t value = tci_read_reg8(regs, **tb_ptr);
     *tb_ptr += 1;
@@ -216,7 +216,7 @@ static uint8_t tci_read_r8(const tcg_target_ulong *regs, uint8_t **tb_ptr)
 
 #if TCG_TARGET_HAS_ext8s_i32 || TCG_TARGET_HAS_ext8s_i64
 /* Read indexed register (8 bit signed) from bytecode. */
-static int8_t tci_read_r8s(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+static int8_t tci_read_r8s(const tcg_target_ulong *regs, const uint8_t **tb_ptr)
 {
     int8_t value = tci_read_reg8s(regs, **tb_ptr);
     *tb_ptr += 1;
@@ -225,7 +225,8 @@ static int8_t tci_read_r8s(const tcg_target_ulong *regs, uint8_t **tb_ptr)
 #endif
 
 /* Read indexed register (16 bit) from bytecode. */
-static uint16_t tci_read_r16(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+static uint16_t tci_read_r16(const tcg_target_ulong *regs,
+                             const uint8_t **tb_ptr)
 {
     uint16_t value = tci_read_reg16(regs, **tb_ptr);
     *tb_ptr += 1;
@@ -234,7 +235,8 @@ static uint16_t tci_read_r16(const tcg_target_ulong *regs, uint8_t **tb_ptr)
 
 #if TCG_TARGET_HAS_ext16s_i32 || TCG_TARGET_HAS_ext16s_i64
 /* Read indexed register (16 bit signed) from bytecode. */
-static int16_t tci_read_r16s(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+static int16_t tci_read_r16s(const tcg_target_ulong *regs,
+                             const uint8_t **tb_ptr)
 {
     int16_t value = tci_read_reg16s(regs, **tb_ptr);
     *tb_ptr += 1;
@@ -243,7 +245,8 @@ static int16_t tci_read_r16s(const tcg_target_ulong *regs, uint8_t **tb_ptr)
 #endif
 
 /* Read indexed register (32 bit) from bytecode. */
-static uint32_t tci_read_r32(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+static uint32_t tci_read_r32(const tcg_target_ulong *regs,
+                             const uint8_t **tb_ptr)
 {
     uint32_t value = tci_read_reg32(regs, **tb_ptr);
     *tb_ptr += 1;
@@ -252,14 +255,16 @@ static uint32_t tci_read_r32(const tcg_target_ulong *regs, uint8_t **tb_ptr)
 
 #if TCG_TARGET_REG_BITS == 32
 /* Read two indexed registers (2 * 32 bit) from bytecode. */
-static uint64_t tci_read_r64(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+static uint64_t tci_read_r64(const tcg_target_ulong *regs,
+                             const uint8_t **tb_ptr)
 {
     uint32_t low = tci_read_r32(regs, tb_ptr);
     return tci_uint64(tci_read_r32(regs, tb_ptr), low);
 }
 #elif TCG_TARGET_REG_BITS == 64
 /* Read indexed register (32 bit signed) from bytecode. */
-static int32_t tci_read_r32s(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+static int32_t tci_read_r32s(const tcg_target_ulong *regs,
+                             const uint8_t **tb_ptr)
 {
     int32_t value = tci_read_reg32s(regs, **tb_ptr);
     *tb_ptr += 1;
@@ -267,7 +272,8 @@ static int32_t tci_read_r32s(const tcg_target_ulong *regs, uint8_t **tb_ptr)
 }
 
 /* Read indexed register (64 bit) from bytecode. */
-static uint64_t tci_read_r64(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+static uint64_t tci_read_r64(const tcg_target_ulong *regs,
+                             const uint8_t **tb_ptr)
 {
     uint64_t value = tci_read_reg64(regs, **tb_ptr);
     *tb_ptr += 1;
@@ -277,7 +283,7 @@ static uint64_t tci_read_r64(const tcg_target_ulong *regs, uint8_t **tb_ptr)
 
 /* Read indexed register(s) with target address from bytecode. */
 static target_ulong
-tci_read_ulong(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+tci_read_ulong(const tcg_target_ulong *regs, const uint8_t **tb_ptr)
 {
     target_ulong taddr = tci_read_r(regs, tb_ptr);
 #if TARGET_LONG_BITS > TCG_TARGET_REG_BITS
@@ -288,7 +294,7 @@ tci_read_ulong(const tcg_target_ulong *regs, uint8_t **tb_ptr)
 
 /* Read indexed register or constant (native size) from bytecode. */
 static tcg_target_ulong
-tci_read_ri(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+tci_read_ri(const tcg_target_ulong *regs, const uint8_t **tb_ptr)
 {
     tcg_target_ulong value;
     TCGReg r = **tb_ptr;
@@ -302,7 +308,8 @@ tci_read_ri(const tcg_target_ulong *regs, uint8_t **tb_ptr)
 }
 
 /* Read indexed register or constant (32 bit) from bytecode. */
-static uint32_t tci_read_ri32(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+static uint32_t tci_read_ri32(const tcg_target_ulong *regs,
+                              const uint8_t **tb_ptr)
 {
     uint32_t value;
     TCGReg r = **tb_ptr;
@@ -317,14 +324,16 @@ static uint32_t tci_read_ri32(const tcg_target_ulong *regs, uint8_t **tb_ptr)
 
 #if TCG_TARGET_REG_BITS == 32
 /* Read two indexed registers or constants (2 * 32 bit) from bytecode. */
-static uint64_t tci_read_ri64(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+static uint64_t tci_read_ri64(const tcg_target_ulong *regs,
+                              const uint8_t **tb_ptr)
 {
     uint32_t low = tci_read_ri32(regs, tb_ptr);
     return tci_uint64(tci_read_ri32(regs, tb_ptr), low);
 }
 #elif TCG_TARGET_REG_BITS == 64
 /* Read indexed register or constant (64 bit) from bytecode. */
-static uint64_t tci_read_ri64(const tcg_target_ulong *regs, uint8_t **tb_ptr)
+static uint64_t tci_read_ri64(const tcg_target_ulong *regs,
+                              const uint8_t **tb_ptr)
 {
     uint64_t value;
     TCGReg r = **tb_ptr;
@@ -338,7 +347,7 @@ static uint64_t tci_read_ri64(const tcg_target_ulong *regs, uint8_t **tb_ptr)
 }
 #endif
 
-static tcg_target_ulong tci_read_label(uint8_t **tb_ptr)
+static tcg_target_ulong tci_read_label(const uint8_t **tb_ptr)
 {
     tcg_target_ulong label = tci_read_i(tb_ptr);
     tci_assert(label != 0);
@@ -484,8 +493,7 @@ static bool tci_compare64(uint64_t u0, uint64_t u1, TCGCond condition)
 uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
                                             const void *v_tb_ptr)
 {
-    /* TODO: Propagate const through this file. */
-    uint8_t *tb_ptr = (uint8_t *)v_tb_ptr;
+    const uint8_t *tb_ptr = v_tb_ptr;
     tcg_target_ulong regs[TCG_TARGET_NB_REGS];
     long tcg_temps[CPU_TEMP_BUF_NLONGS];
     uintptr_t sp_value = (uintptr_t)(tcg_temps + CPU_TEMP_BUF_NLONGS);
@@ -499,7 +507,7 @@ uintptr_t QEMU_DISABLE_CFI tcg_qemu_tb_exec(CPUArchState *env,
         TCGOpcode opc = tb_ptr[0];
 #if defined(CONFIG_DEBUG_TCG) && !defined(NDEBUG)
         uint8_t op_size = tb_ptr[1];
-        uint8_t *old_code_ptr = tb_ptr;
+        const uint8_t *old_code_ptr = tb_ptr;
 #endif
         tcg_target_ulong t0;
         tcg_target_ulong t1;