tcg: Adjust TCGLabel for const

Change TCGLabel.u.value_ptr to const, and initialize it with
tcg_splitwx_to_rx.  Propagate const through tcg/host/ only
as far as needed to avoid errors from the value_ptr change.

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

7 files changed, 10 insertions, 9 deletions

diff --git a/include/tcg/tcg.h b/include/tcg/tcg.h
index b769e868bc..e9af279738 100644
--- a/include/tcg/tcg.h
+++ b/include/tcg/tcg.h
@@ -261,7 +261,7 @@ struct TCGLabel {
     unsigned refs : 16;
     union {
         uintptr_t value;
-        tcg_insn_unit *value_ptr;
+        const tcg_insn_unit *value_ptr;
     } u;
     QSIMPLEQ_HEAD(, TCGRelocation) relocs;
     QSIMPLEQ_ENTRY(TCGLabel) next;
diff --git a/tcg/aarch64/tcg-target.c.inc b/tcg/aarch64/tcg-target.c.inc
index 76f8ae48ad..96dc9f4d0b 100644
--- a/tcg/aarch64/tcg-target.c.inc
+++ b/tcg/aarch64/tcg-target.c.inc
@@ -1306,7 +1306,7 @@ static void tcg_out_cmp(TCGContext *s, TCGType ext, TCGReg a,
     }
 }
 
-static inline void tcg_out_goto(TCGContext *s, tcg_insn_unit *target)
+static void tcg_out_goto(TCGContext *s, const tcg_insn_unit *target)
 {
     ptrdiff_t offset = target - s->code_ptr;
     tcg_debug_assert(offset == sextract64(offset, 0, 26));
diff --git a/tcg/arm/tcg-target.c.inc b/tcg/arm/tcg-target.c.inc
index 1e32bf42b8..f8f485d807 100644
--- a/tcg/arm/tcg-target.c.inc
+++ b/tcg/arm/tcg-target.c.inc
@@ -1019,7 +1019,7 @@ static inline void tcg_out_st8(TCGContext *s, int cond,
  * with the code buffer limited to 16MB we wouldn't need the long case.
  * But we also use it for the tail-call to the qemu_ld/st helpers, which does.
  */
-static void tcg_out_goto(TCGContext *s, int cond, tcg_insn_unit *addr)
+static void tcg_out_goto(TCGContext *s, int cond, const tcg_insn_unit *addr)
 {
     intptr_t addri = (intptr_t)addr;
     ptrdiff_t disp = tcg_pcrel_diff(s, addr);
diff --git a/tcg/mips/tcg-target.c.inc b/tcg/mips/tcg-target.c.inc
index f641105f9a..a3f838fa51 100644
--- a/tcg/mips/tcg-target.c.inc
+++ b/tcg/mips/tcg-target.c.inc
@@ -144,7 +144,8 @@ static tcg_insn_unit *bswap32_addr;
 static tcg_insn_unit *bswap32u_addr;
 static tcg_insn_unit *bswap64_addr;
 
-static inline uint32_t reloc_pc16_val(tcg_insn_unit *pc, tcg_insn_unit *target)
+static inline uint32_t reloc_pc16_val(tcg_insn_unit *pc,
+                                      const tcg_insn_unit *target)
 {
     /* Let the compiler perform the right-shift as part of the arithmetic.  */
     ptrdiff_t disp = target - (pc + 1);
@@ -152,7 +153,7 @@ static inline uint32_t reloc_pc16_val(tcg_insn_unit *pc, tcg_insn_unit *target)
     return disp & 0xffff;
 }
 
-static inline void reloc_pc16(tcg_insn_unit *pc, tcg_insn_unit *target)
+static inline void reloc_pc16(tcg_insn_unit *pc, const tcg_insn_unit *target)
 {
     *pc = deposit32(*pc, 0, 16, reloc_pc16_val(pc, target));
 }
diff --git a/tcg/ppc/tcg-target.c.inc b/tcg/ppc/tcg-target.c.inc
index 15d5c78798..d108f01fec 100644
--- a/tcg/ppc/tcg-target.c.inc
+++ b/tcg/ppc/tcg-target.c.inc
@@ -184,7 +184,7 @@ static inline bool in_range_b(tcg_target_long target)
     return target == sextract64(target, 0, 26);
 }
 
-static uint32_t reloc_pc24_val(tcg_insn_unit *pc, tcg_insn_unit *target)
+static uint32_t reloc_pc24_val(tcg_insn_unit *pc, const tcg_insn_unit *target)
 {
     ptrdiff_t disp = tcg_ptr_byte_diff(target, pc);
     tcg_debug_assert(in_range_b(disp));
@@ -201,7 +201,7 @@ static bool reloc_pc24(tcg_insn_unit *pc, tcg_insn_unit *target)
     return false;
 }
 
-static uint16_t reloc_pc14_val(tcg_insn_unit *pc, tcg_insn_unit *target)
+static uint16_t reloc_pc14_val(tcg_insn_unit *pc, const tcg_insn_unit *target)
 {
     ptrdiff_t disp = tcg_ptr_byte_diff(target, pc);
     tcg_debug_assert(disp == (int16_t) disp);
diff --git a/tcg/s390/tcg-target.c.inc b/tcg/s390/tcg-target.c.inc
index ac99ccea73..1b5c4f0ab0 100644
--- a/tcg/s390/tcg-target.c.inc
+++ b/tcg/s390/tcg-target.c.inc
@@ -1302,7 +1302,7 @@ static void tgen_extract(TCGContext *s, TCGReg dest, TCGReg src,
     tcg_out_risbg(s, dest, src, 64 - len, 63, 64 - ofs, 1);
 }
 
-static void tgen_gotoi(TCGContext *s, int cc, tcg_insn_unit *dest)
+static void tgen_gotoi(TCGContext *s, int cc, const tcg_insn_unit *dest)
 {
     ptrdiff_t off = dest - s->code_ptr;
     if (off == (int16_t)off) {
diff --git a/tcg/tcg.c b/tcg/tcg.c
index 7bf441979d..325e439cb7 100644
--- a/tcg/tcg.c
+++ b/tcg/tcg.c
@@ -306,7 +306,7 @@ static void tcg_out_label(TCGContext *s, TCGLabel *l, tcg_insn_unit *ptr)
 {
     tcg_debug_assert(!l->has_value);
     l->has_value = 1;
-    l->u.value_ptr = ptr;
+    l->u.value_ptr = tcg_splitwx_to_rx(ptr);
 }
 
 TCGLabel *gen_new_label(void)