Fix GCC 7 -Wimplicit-fallthrough warnings.

4 files changed, 16 insertions, 2 deletions

diff --git a/dynasm/dasm_arm.h b/dynasm/dasm_arm.h
index a43f7c66..1d404ccd 100644
--- a/dynasm/dasm_arm.h
+++ b/dynasm/dasm_arm.h
@@ -254,6 +254,7 @@ void dasm_put(Dst_DECL, int start, ...)
       case DASM_IMMV8:
         CK((n & 3) == 0, RANGE_I);
         n >>= 2;
+        /* fallthrough */
       case DASM_IMML8:
       case DASM_IMML12:
         CK(n >= 0 ? ((n>>((ins>>5)&31)) == 0) :
@@ -371,6 +372,7 @@ int dasm_encode(Dst_DECL, void *buffer)
           break;
         case DASM_REL_LG:
           CK(n >= 0, UNDEF_LG);
+          /* fallthrough */
         case DASM_REL_PC:
           CK(n >= 0, UNDEF_PC);
           n = *DASM_POS2PTR(D, n) - (int)((char *)cp - base) - 4;
diff --git a/dynasm/dasm_mips.h b/dynasm/dasm_mips.h
index 7eac6694..46af0349 100644
--- a/dynasm/dasm_mips.h
+++ b/dynasm/dasm_mips.h
@@ -350,6 +350,7 @@ int dasm_encode(Dst_DECL, void *buffer)
           break;
         case DASM_REL_LG:
           CK(n >= 0, UNDEF_LG);
+          /* fallthrough */
         case DASM_REL_PC:
           CK(n >= 0, UNDEF_PC);
           n = *DASM_POS2PTR(D, n);
diff --git a/dynasm/dasm_ppc.h b/dynasm/dasm_ppc.h
index 61103612..81b9a76b 100644
--- a/dynasm/dasm_ppc.h
+++ b/dynasm/dasm_ppc.h
@@ -350,6 +350,7 @@ int dasm_encode(Dst_DECL, void *buffer)
           break;
         case DASM_REL_LG:
           CK(n >= 0, UNDEF_LG);
+          /* fallthrough */
         case DASM_REL_PC:
           CK(n >= 0, UNDEF_PC);
           n = *DASM_POS2PTR(D, n) - (int)((char *)cp - base);
diff --git a/dynasm/dasm_x86.h b/dynasm/dasm_x86.h
index f9260b0c..8ae911df 100644
--- a/dynasm/dasm_x86.h
+++ b/dynasm/dasm_x86.h
@@ -194,12 +194,13 @@ void dasm_put(Dst_DECL, int start, ...)
       switch (action) {
       case DASM_DISP:
         if (n == 0) { if ((mrm&7) == 4) mrm = p[-2]; if ((mrm&7) != 5) break; }
-      case DASM_IMM_DB: if (((n+128)&-256) == 0) goto ob;
+        /* fallthrough */
+      case DASM_IMM_DB: if (((n+128)&-256) == 0) goto ob; /* fallthrough */
       case DASM_REL_A: /* Assumes ptrdiff_t is int. !x64 */
       case DASM_IMM_D: ofs += 4; break;
       case DASM_IMM_S: CK(((n+128)&-256) == 0, RANGE_I); goto ob;
       case DASM_IMM_B: CK((n&-256) == 0, RANGE_I); ob: ofs++; break;
-      case DASM_IMM_WB: if (((n+128)&-256) == 0) goto ob;
+      case DASM_IMM_WB: if (((n+128)&-256) == 0) goto ob; /* fallthrough */
       case DASM_IMM_W: CK((n&-65536) == 0, RANGE_I); ofs += 2; break;
       case DASM_SPACE: p++; ofs += n; break;
       case DASM_SETLABEL: b[pos-2] = -0x40000000; break;  /* Neg. label ofs. */
@@ -323,11 +324,14 @@ int dasm_link(Dst_DECL, size_t *szp)
           pos += 2;
           break;
         }
+          /* fallthrough */
         case DASM_SPACE: case DASM_IMM_LG: case DASM_VREG: p++;
+          /* fallthrough */
         case DASM_DISP: case DASM_IMM_S: case DASM_IMM_B: case DASM_IMM_W:
         case DASM_IMM_D: case DASM_IMM_WB: case DASM_IMM_DB:
         case DASM_SETLABEL: case DASM_REL_A: case DASM_IMM_PC: pos++; break;
         case DASM_LABEL_LG: p++;
+          /* fallthrough */
         case DASM_LABEL_PC: b[pos++] += ofs; break; /* Fix label offset. */
         case DASM_ALIGN: ofs -= (b[pos++]+ofs)&*p++; break; /* Adjust ofs. */
         case DASM_EXTERN: p += 2; break;
@@ -385,16 +389,20 @@ int dasm_encode(Dst_DECL, void *buffer)
             if (mrm != 5) { mm[-1] -= 0x80; break; } }
           if (((n+128) & -256) != 0) goto wd; else mm[-1] -= 0x40;
         }
+          /* fallthrough */
         case DASM_IMM_S: case DASM_IMM_B: wb: dasmb(n); break;
         case DASM_IMM_DB: if (((n+128)&-256) == 0) {
             db: if (!mark) mark = cp; mark[-2] += 2; mark = NULL; goto wb;
           } else mark = NULL;
+          /* fallthrough */
         case DASM_IMM_D: wd: dasmd(n); break;
         case DASM_IMM_WB: if (((n+128)&-256) == 0) goto db; else mark = NULL;
+          /* fallthrough */
         case DASM_IMM_W: dasmw(n); break;
         case DASM_VREG: { int t = *p++; if (t >= 2) n<<=3; cp[-1] |= n; break; }
         case DASM_REL_LG: p++; if (n >= 0) goto rel_pc;
           b++; n = (int)(ptrdiff_t)D->globals[-n];
+          /* fallthrough */
         case DASM_REL_A: rel_a:
           n -= (unsigned int)(ptrdiff_t)(cp+4); goto wd; /* !x64 */
         case DASM_REL_PC: rel_pc: {
@@ -407,6 +415,7 @@ int dasm_encode(Dst_DECL, void *buffer)
         }
         case DASM_IMM_LG:
           p++; if (n < 0) { n = (int)(ptrdiff_t)D->globals[-n]; goto wd; }
+          /* fallthrough */
         case DASM_IMM_PC: {
           int *pb = DASM_POS2PTR(D, n);
           n = *pb < 0 ? pb[1] : (*pb + (int)(ptrdiff_t)base);
@@ -427,6 +436,7 @@ int dasm_encode(Dst_DECL, void *buffer)
         case DASM_EXTERN: n = DASM_EXTERN(Dst, cp, p[1], *p); p += 2; goto wd;
         case DASM_MARK: mark = cp; break;
         case DASM_ESC: action = *p++;
+          /* fallthrough */
         default: *cp++ = action; break;
         case DASM_SECTION: case DASM_STOP: goto stop;
         }