From 0903e2a72e8f3aa848fdbb60f1ceece7af3d1cb4 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby.or.jp>
Date: Mon, 25 Jan 2021 15:41:29 +0900
Subject: Silence 'loss of data' warnings.

---
 src/backtrace.c | 6 ++++--
 src/codedump.c  | 6 +++---
 src/dump.c      | 2 +-
 src/vm.c        | 8 ++++----
 4 files changed, 12 insertions(+), 10 deletions(-)

(limited to 'src')

diff --git a/src/backtrace.c b/src/backtrace.c
index 508fe99e9..65404d23a 100644
--- a/src/backtrace.c
+++ b/src/backtrace.c
@@ -41,6 +41,7 @@ each_backtrace(mrb_state *mrb, ptrdiff_t ciidx, each_backtrace_func func, void *
     mrb_callinfo *ci;
     const mrb_irep *irep;
     const mrb_code *pc;
+    uint32_t idx;
 
     ci = &mrb->c->cibase[i];
 
@@ -57,10 +58,11 @@ each_backtrace(mrb_state *mrb, ptrdiff_t ciidx, each_backtrace_func func, void *
       continue;
     }
 
-    loc.lineno = mrb_debug_get_line(mrb, irep, pc - irep->iseq);
+    idx = (uint32_t)(pc - irep->iseq);
+    loc.lineno = mrb_debug_get_line(mrb, irep, idx);
     if (loc.lineno == -1) continue;
 
-    loc.filename = mrb_debug_get_filename(mrb, irep, pc - irep->iseq);
+    loc.filename = mrb_debug_get_filename(mrb, irep, idx);
     if (!loc.filename) {
       loc.filename = "(unknown)";
     }
diff --git a/src/codedump.c b/src/codedump.c
index e6c6e6c3d..3a7b34354 100644
--- a/src/codedump.c
+++ b/src/codedump.c
@@ -42,7 +42,7 @@ print_lv_ab(mrb_state *mrb, const mrb_irep *irep, uint16_t a, uint16_t b)
 }
 
 static void
-print_header(mrb_state *mrb, const mrb_irep *irep, ptrdiff_t i)
+print_header(mrb_state *mrb, const mrb_irep *irep, uint32_t i)
 {
   int32_t line;
 
@@ -120,12 +120,12 @@ codedump(mrb_state *mrb, const mrb_irep *irep)
     ai = mrb_gc_arena_save(mrb);
 
     i = pc - irep->iseq;
-    next_file = mrb_debug_get_filename(mrb, irep, i);
+    next_file = mrb_debug_get_filename(mrb, irep, (uint32_t)i);
     if (next_file && file != next_file) {
       printf("file: %s\n", next_file);
       file = next_file;
     }
-    print_header(mrb, irep, i);
+    print_header(mrb, irep, (uint32_t)i);
     ins = READ_B();
     switch (ins) {
     CASE(OP_NOP, Z);
diff --git a/src/dump.c b/src/dump.c
index 10b6d9dec..76508a27e 100644
--- a/src/dump.c
+++ b/src/dump.c
@@ -1043,7 +1043,7 @@ sym_operator_name(const char *sym_name, mrb_int len)
   for (start = 0; table_size != 0; table_size/=2) {
     idx = start+table_size/2;
     op_sym = &operator_table[idx];
-    cmp = len-op_sym->sym_name_len;
+    cmp = (int)(len-op_sym->sym_name_len);
     if (cmp == 0) {
       cmp = memcmp(sym_name, op_sym->sym_name, len);
       if (cmp == 0) return op_sym->name;
diff --git a/src/vm.c b/src/vm.c
index 3ea594250..dd18ed44d 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -279,8 +279,8 @@ cipush(mrb_state *mrb, mrb_int push_stacks, mrb_int acc,
   ci->mid = mid;
   mrb_vm_ci_proc_set(ci, proc);
   ci->stack = ci[-1].stack + push_stacks;
-  ci->argc = argc;
-  ci->acc = acc;
+  ci->argc = (int16_t)argc;
+  ci->acc = (int16_t)acc;
   ci->u.target_class = target_class;
 
   return ci;
@@ -1282,7 +1282,7 @@ RETRY_TRY_BLOCK:
     }
 
     CASE(OP_JMPUW, S) {
-      a = (pc - irep->iseq) + (int16_t)a;
+      a = (uint32_t)((pc - irep->iseq) + (int16_t)a);
       CHECKPOINT_RESTORE(RBREAK_TAG_JUMP) {
         struct RBreak *brk = (struct RBreak*)mrb->exc;
         mrb_value target = mrb_break_value_get(brk);
@@ -1855,7 +1855,7 @@ RETRY_TRY_BLOCK:
       }
 
       /* format arguments for generated code */
-      mrb->c->ci->argc = len + kd;
+      mrb->c->ci->argc = (int16_t)(len + kd);
 
       /* clear local (but non-argument) variables */
       if (irep->nlocals-blk_pos-1 > 0) {
-- 
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