Change return type of gdbarch_software_single_step to vector<CORE_ADDR>

This is a relatively straightforward patch that changes
gdbarch_software_single_step so it returns an std::vector<CORE_ADDR>
instead of a VEC (CORE_ADDR).

gdb/ChangeLog:

	* gdbarch.sh (software_single_step): Change return type to
	std::vector<CORE_ADDR>.
	* gdbarch.c, gdbarch.h: Re-generate.
	* arch/arm-get-next-pcs.c (thumb_deal_with_atomic_sequence_raw):
	Adjust.
	(arm_deal_with_atomic_sequence_raw): Adjust.
	(thumb_get_next_pcs_raw): Adjust.
	(arm_get_next_pcs_raw): Adjust.
	(arm_get_next_pcs): Adjust.
	* arch/arm-get-next-pcs.h (arm_get_next_pcs): Adjust.
	* aarch64-tdep.c (aarch64_software_single_step): Adjust.
	* alpha-tdep.c (alpha_deal_with_atomic_sequence): Adjust.
	(alpha_software_single_step): Adjust.
	* alpha-tdep.h (alpha_software_single_step): Adjust.
	* arm-linux-tdep.c (arm_linux_software_single_step): Adjust.
	* arm-tdep.c (arm_software_single_step): Adjust.
	(arm_breakpoint_kind_from_current_state): Adjust.
	* arm-tdep.h (arm_software_single_step): Adjust.
	* breakpoint.c (insert_single_step_breakpoint): Adjust.
	* cris-tdep.c (cris_software_single_step): Adjust.
	* mips-tdep.c (mips_deal_with_atomic_sequence): Adjust.
	(micromips_deal_with_atomic_sequence): Adjust.
	(deal_with_atomic_sequence): Adjust.
	(mips_software_single_step): Adjust.
	* mips-tdep.h (mips_software_single_step): Adjust.
	* moxie-tdep.c (moxie_software_single_step): Adjust.
	* nios2-tdep.c (nios2_software_single_step): Adjust.
	* ppc-tdep.h (ppc_deal_with_atomic_sequence): Adjust.
	* rs6000-aix-tdep.c (rs6000_software_single_step): Adjust.
	* rs6000-tdep.c (ppc_deal_with_atomic_sequence): Adjust.
	* s390-linux-tdep.c (s390_software_single_step): Adjust.
	* sparc-tdep.c (sparc_software_single_step): Adjust.
	* spu-tdep.c (spu_software_single_step): Adjust.
	* tic6x-tdep.c (tic6x_software_single_step): Adjust.

gdb/gdbserver/ChangeLog:

	* linux-arm-low.c (arm_gdbserver_get_next_pcs): Adjust to
	software_single_step change of return type to
	std::vector<CORE_ADDR>.
	* linux-low.c (install_software_single_step_breakpoints):
	Likewise.
	* linux-low.h (install_software_single_step_breakpoints):
	Likewise.

29 files changed, 223 insertions, 222 deletions

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 20fe2d4d09..0624f2fd71 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,42 @@
 2017-05-02  Simon Marchi  <simon.marchi@polymtl.ca>
 
+	* gdbarch.sh (software_single_step): Change return type to
+	std::vector<CORE_ADDR>.
+	* gdbarch.c, gdbarch.h: Re-generate.
+	* arch/arm-get-next-pcs.c (thumb_deal_with_atomic_sequence_raw):
+	Adjust.
+	(arm_deal_with_atomic_sequence_raw): Adjust.
+	(thumb_get_next_pcs_raw): Adjust.
+	(arm_get_next_pcs_raw): Adjust.
+	(arm_get_next_pcs): Adjust.
+	* arch/arm-get-next-pcs.h (arm_get_next_pcs): Adjust.
+	* aarch64-tdep.c (aarch64_software_single_step): Adjust.
+	* alpha-tdep.c (alpha_deal_with_atomic_sequence): Adjust.
+	(alpha_software_single_step): Adjust.
+	* alpha-tdep.h (alpha_software_single_step): Adjust.
+	* arm-linux-tdep.c (arm_linux_software_single_step): Adjust.
+	* arm-tdep.c (arm_software_single_step): Adjust.
+	(arm_breakpoint_kind_from_current_state): Adjust.
+	* arm-tdep.h (arm_software_single_step): Adjust.
+	* breakpoint.c (insert_single_step_breakpoint): Adjust.
+	* cris-tdep.c (cris_software_single_step): Adjust.
+	* mips-tdep.c (mips_deal_with_atomic_sequence): Adjust.
+	(micromips_deal_with_atomic_sequence): Adjust.
+	(deal_with_atomic_sequence): Adjust.
+	(mips_software_single_step): Adjust.
+	* mips-tdep.h (mips_software_single_step): Adjust.
+	* moxie-tdep.c (moxie_software_single_step): Adjust.
+	* nios2-tdep.c (nios2_software_single_step): Adjust.
+	* ppc-tdep.h (ppc_deal_with_atomic_sequence): Adjust.
+	* rs6000-aix-tdep.c (rs6000_software_single_step): Adjust.
+	* rs6000-tdep.c (ppc_deal_with_atomic_sequence): Adjust.
+	* s390-linux-tdep.c (s390_software_single_step): Adjust.
+	* sparc-tdep.c (sparc_software_single_step): Adjust.
+	* spu-tdep.c (spu_software_single_step): Adjust.
+	* tic6x-tdep.c (tic6x_software_single_step): Adjust.
+
+2017-05-02  Simon Marchi  <simon.marchi@polymtl.ca>
+
 	* gdbarch.sh: Use semi-colon as field separator instead of colon.
 	* gdbarch.h: Re-generate.
 
diff --git a/gdb/aarch64-tdep.c b/gdb/aarch64-tdep.c
index d203ebec77..000540a4f5 100644
--- a/gdb/aarch64-tdep.c
+++ b/gdb/aarch64-tdep.c
@@ -2417,7 +2417,7 @@ value_of_aarch64_user_reg (struct frame_info *frame, const void *baton)
 /* Implement the "software_single_step" gdbarch method, needed to
    single step through atomic sequences on AArch64.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 aarch64_software_single_step (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
@@ -2435,14 +2435,13 @@ aarch64_software_single_step (struct regcache *regcache)
   int bc_insn_count = 0; /* Conditional branch instruction count.  */
   int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed).  */
   aarch64_inst inst;
-  VEC (CORE_ADDR) *next_pcs = NULL;
 
   if (aarch64_decode_insn (insn, &inst, 1) != 0)
-    return NULL;
+    return {};
 
   /* Look for a Load Exclusive instruction which begins the sequence.  */
   if (inst.opcode->iclass != ldstexcl || bit (insn, 22) == 0)
-    return NULL;
+    return {};
 
   for (insn_count = 0; insn_count < atomic_sequence_length; ++insn_count)
     {
@@ -2451,14 +2450,14 @@ aarch64_software_single_step (struct regcache *regcache)
 					   byte_order_for_code);
 
       if (aarch64_decode_insn (insn, &inst, 1) != 0)
-	return NULL;
+	return {};
       /* Check if the instruction is a conditional branch.  */
       if (inst.opcode->iclass == condbranch)
 	{
 	  gdb_assert (inst.operands[0].type == AARCH64_OPND_ADDR_PCREL19);
 
 	  if (bc_insn_count >= 1)
-	    return NULL;
+	    return {};
 
 	  /* It is, so we'll try to set a breakpoint at the destination.  */
 	  breaks[1] = loc + inst.operands[0].imm.value;
@@ -2477,7 +2476,7 @@ aarch64_software_single_step (struct regcache *regcache)
 
   /* We didn't find a closing Store Exclusive instruction, fall back.  */
   if (!closing_insn)
-    return NULL;
+    return {};
 
   /* Insert breakpoint after the end of the atomic sequence.  */
   breaks[0] = loc + insn_size;
@@ -2489,10 +2488,12 @@ aarch64_software_single_step (struct regcache *regcache)
 	  || (breaks[1] >= pc && breaks[1] <= closing_insn)))
     last_breakpoint = 0;
 
+  std::vector<CORE_ADDR> next_pcs;
+
   /* Insert the breakpoint at the end of the sequence, and one at the
      destination of the conditional branch, if it exists.  */
   for (index = 0; index <= last_breakpoint; index++)
-    VEC_safe_push (CORE_ADDR, next_pcs, breaks[index]);
+    next_pcs.push_back (breaks[index]);
 
   return next_pcs;
 }
diff --git a/gdb/alpha-tdep.c b/gdb/alpha-tdep.c
index 7c521db24c..d62566c4b0 100644
--- a/gdb/alpha-tdep.c
+++ b/gdb/alpha-tdep.c
@@ -765,7 +765,7 @@ static const int stq_c_opcode = 0x2f;
    is found, attempt to step through it.  A breakpoint is placed at the end of 
    the sequence.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 alpha_deal_with_atomic_sequence (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
@@ -779,12 +779,11 @@ alpha_deal_with_atomic_sequence (struct regcache *regcache)
   int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed).  */  
   const int atomic_sequence_length = 16; /* Instruction sequence length.  */
   int bc_insn_count = 0; /* Conditional branch instruction count.  */
-  VEC (CORE_ADDR) *next_pcs = NULL;
 
   /* Assume all atomic sequences start with a LDL_L/LDQ_L instruction.  */
   if (INSN_OPCODE (insn) != ldl_l_opcode
       && INSN_OPCODE (insn) != ldq_l_opcode)
-    return NULL;
+    return {};
 
   /* Assume that no atomic sequence is longer than "atomic_sequence_length" 
      instructions.  */
@@ -803,8 +802,8 @@ alpha_deal_with_atomic_sequence (struct regcache *regcache)
 	  immediate = (immediate ^ 0x400000) - 0x400000;
 
 	  if (bc_insn_count >= 1)
-	    return NULL; /* More than one branch found, fallback 
-			    to the standard single-step code.  */
+	    return {}; /* More than one branch found, fallback
+			  to the standard single-step code.  */
 
 	  breaks[1] = loc + ALPHA_INSN_SIZE + immediate;
 
@@ -820,7 +819,7 @@ alpha_deal_with_atomic_sequence (struct regcache *regcache)
   /* Assume that the atomic sequence ends with a STL_C/STQ_C instruction.  */
   if (INSN_OPCODE (insn) != stl_c_opcode
       && INSN_OPCODE (insn) != stq_c_opcode)
-    return NULL;
+    return {};
 
   closing_insn = loc;
   loc += ALPHA_INSN_SIZE;
@@ -835,8 +834,10 @@ alpha_deal_with_atomic_sequence (struct regcache *regcache)
 	  || (breaks[1] >= pc && breaks[1] <= closing_insn)))
     last_breakpoint = 0;
 
+  std::vector<CORE_ADDR> next_pcs;
+
   for (index = 0; index <= last_breakpoint; index++)
-    VEC_safe_push (CORE_ADDR, next_pcs, breaks[index]);
+    next_pcs.push_back (breaks[index]);
 
   return next_pcs;
 }
@@ -1717,17 +1718,15 @@ alpha_next_pc (struct regcache *regcache, CORE_ADDR pc)
   return (pc + ALPHA_INSN_SIZE);
 }
 
-VEC (CORE_ADDR) *
+std::vector<CORE_ADDR>
 alpha_software_single_step (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
   CORE_ADDR pc;
-  VEC (CORE_ADDR) *next_pcs = NULL;
 
-  pc = regcache_read_pc (regcache);
+  pc = alpha_next_pc (regcache, regcache_read_pc (regcache));
 
-  VEC_safe_push (CORE_ADDR, next_pcs, alpha_next_pc (regcache, pc));
-  return next_pcs;
+  return {pc};
 }
 
 
diff --git a/gdb/alpha-tdep.h b/gdb/alpha-tdep.h
index ab46ba56be..5f1d103273 100644
--- a/gdb/alpha-tdep.h
+++ b/gdb/alpha-tdep.h
@@ -103,7 +103,8 @@ struct gdbarch_tdep
 };
 
 extern unsigned int alpha_read_insn (struct gdbarch *gdbarch, CORE_ADDR pc);
-extern VEC (CORE_ADDR) *alpha_software_single_step (struct regcache *regcache);
+extern std::vector<CORE_ADDR> alpha_software_single_step
+  (struct regcache *regcache);
 extern CORE_ADDR alpha_after_prologue (CORE_ADDR pc);
 
 extern void alpha_mdebug_init_abi (struct gdbarch_info, struct gdbarch *);
diff --git a/gdb/arch/arm-get-next-pcs.c b/gdb/arch/arm-get-next-pcs.c
index 398dd59ac7..4e5234cb77 100644
--- a/gdb/arch/arm-get-next-pcs.c
+++ b/gdb/arch/arm-get-next-pcs.c
@@ -45,7 +45,7 @@ arm_get_next_pcs_ctor (struct arm_get_next_pcs *self,
    is found, attempt to step through it.  The end of the sequence address is
    added to the next_pcs list.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 thumb_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
 {
   int byte_order_for_code = self->byte_order_for_code;
@@ -58,27 +58,26 @@ thumb_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
   int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed).  */
   const int atomic_sequence_length = 16; /* Instruction sequence length.  */
   ULONGEST status, itstate;
-  VEC (CORE_ADDR) *next_pcs = NULL;
 
   /* We currently do not support atomic sequences within an IT block.  */
   status = regcache_raw_get_unsigned (self->regcache, ARM_PS_REGNUM);
   itstate = ((status >> 8) & 0xfc) | ((status >> 25) & 0x3);
   if (itstate & 0x0f)
-    return NULL;
+    return {};
 
   /* Assume all atomic sequences start with a ldrex{,b,h,d} instruction.  */
   insn1 = self->ops->read_mem_uint (loc, 2, byte_order_for_code);
 
   loc += 2;
   if (thumb_insn_size (insn1) != 4)
-    return NULL;
+    return {};
 
   insn2 = self->ops->read_mem_uint (loc, 2, byte_order_for_code);
 
   loc += 2;
   if (!((insn1 & 0xfff0) == 0xe850
         || ((insn1 & 0xfff0) == 0xe8d0 && (insn2 & 0x00c0) == 0x0040)))
-    return NULL;
+    return {};
 
   /* Assume that no atomic sequence is longer than "atomic_sequence_length"
      instructions.  */
@@ -95,8 +94,8 @@ thumb_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
 	  if ((insn1 & 0xf000) == 0xd000 && bits (insn1, 8, 11) != 0x0f)
 	    {
 	      if (last_breakpoint > 0)
-		return NULL; /* More than one conditional branch found,
-			     fallback to the standard code.  */
+		return {}; /* More than one conditional branch found,
+			      fallback to the standard code.  */
 
 	      breaks[1] = loc + 2 + (sbits (insn1, 0, 7) << 1);
 	      last_breakpoint++;
@@ -107,7 +106,7 @@ thumb_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
 	     Fall back to standard code to avoid losing control of
 	     execution.  */
 	  else if (thumb_instruction_changes_pc (insn1))
-	    return NULL;
+	    return {};
 	}
       else
 	{
@@ -135,8 +134,8 @@ thumb_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
 	      offset += (imm1 << 12) + (imm2 << 1);
 
 	      if (last_breakpoint > 0)
-		return 0; /* More than one conditional branch found,
-			     fallback to the standard code.  */
+		return {}; /* More than one conditional branch found,
+			      fallback to the standard code.  */
 
 	      breaks[1] = loc + offset;
 	      last_breakpoint++;
@@ -147,7 +146,7 @@ thumb_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
 	     Fall back to standard code to avoid losing control of
 	     execution.  */
 	  else if (thumb2_instruction_changes_pc (insn1, insn2))
-	    return NULL;
+	    return {};
 
 	  /* If we find a strex{,b,h,d}, we're done.  */
 	  if ((insn1 & 0xfff0) == 0xe840
@@ -158,7 +157,7 @@ thumb_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
 
   /* If we didn't find the strex{,b,h,d}, we cannot handle the sequence.  */
   if (insn_count == atomic_sequence_length)
-    return NULL;
+    return {};
 
   /* Insert a breakpoint right after the end of the atomic sequence.  */
   breaks[0] = loc;
@@ -170,9 +169,11 @@ thumb_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
 	  || (breaks[1] >= pc && breaks[1] < loc)))
     last_breakpoint = 0;
 
+  std::vector<CORE_ADDR> next_pcs;
+
   /* Adds the breakpoints to the list to be inserted.  */
   for (index = 0; index <= last_breakpoint; index++)
-    VEC_safe_push (CORE_ADDR, next_pcs, MAKE_THUMB_ADDR (breaks[index]));
+    next_pcs.push_back (MAKE_THUMB_ADDR (breaks[index]));
 
   return next_pcs;
 }
@@ -182,7 +183,7 @@ thumb_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
    is found, attempt to step through it.  The end of the sequence address is
    added to the next_pcs list.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 arm_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
 {
   int byte_order_for_code = self->byte_order_for_code;
@@ -194,7 +195,6 @@ arm_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
   int index;
   int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed).  */
   const int atomic_sequence_length = 16; /* Instruction sequence length.  */
-  VEC (CORE_ADDR) *next_pcs = NULL;
 
   /* Assume all atomic sequences start with a ldrex{,b,h,d} instruction.
      Note that we do not currently support conditionally executed atomic
@@ -203,7 +203,7 @@ arm_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
 
   loc += 4;
   if ((insn & 0xff9000f0) != 0xe1900090)
-    return NULL;
+    return {};
 
   /* Assume that no atomic sequence is longer than "atomic_sequence_length"
      instructions.  */
@@ -219,8 +219,8 @@ arm_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
       if (bits (insn, 24, 27) == 0xa)
 	{
           if (last_breakpoint > 0)
-            return NULL; /* More than one conditional branch found, fallback
-                         to the standard single-step code.  */
+            return {}; /* More than one conditional branch found, fallback
+			  to the standard single-step code.  */
 
 	  breaks[1] = BranchDest (loc - 4, insn);
 	  last_breakpoint++;
@@ -230,7 +230,7 @@ arm_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
          but conditional branches to change the PC.  Fall back to standard
 	 code to avoid losing control of execution.  */
       else if (arm_instruction_changes_pc (insn))
-	return NULL;
+	return {};
 
       /* If we find a strex{,b,h,d}, we're done.  */
       if ((insn & 0xff9000f0) == 0xe1800090)
@@ -239,7 +239,7 @@ arm_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
 
   /* If we didn't find the strex{,b,h,d}, we cannot handle the sequence.  */
   if (insn_count == atomic_sequence_length)
-    return NULL;
+    return {};
 
   /* Insert a breakpoint right after the end of the atomic sequence.  */
   breaks[0] = loc;
@@ -251,16 +251,18 @@ arm_deal_with_atomic_sequence_raw (struct arm_get_next_pcs *self)
 	  || (breaks[1] >= pc && breaks[1] < loc)))
     last_breakpoint = 0;
 
+  std::vector<CORE_ADDR> next_pcs;
+
   /* Adds the breakpoints to the list to be inserted.  */
   for (index = 0; index <= last_breakpoint; index++)
-    VEC_safe_push (CORE_ADDR, next_pcs, breaks[index]);
+    next_pcs.push_back (breaks[index]);
 
   return next_pcs;
 }
 
 /* Find the next possible PCs for thumb mode.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 thumb_get_next_pcs_raw (struct arm_get_next_pcs *self)
 {
   int byte_order = self->byte_order;
@@ -272,7 +274,7 @@ thumb_get_next_pcs_raw (struct arm_get_next_pcs *self)
   unsigned long offset;
   ULONGEST status, itstate;
   struct regcache *regcache = self->regcache;
-  VEC (CORE_ADDR) * next_pcs = NULL;
+  std::vector<CORE_ADDR> next_pcs;
 
   nextpc = MAKE_THUMB_ADDR (nextpc);
   pc_val = MAKE_THUMB_ADDR (pc_val);
@@ -315,7 +317,7 @@ thumb_get_next_pcs_raw (struct arm_get_next_pcs *self)
 	      itstate = thumb_advance_itstate (itstate);
 	    }
 
-	  VEC_safe_push (CORE_ADDR, next_pcs, MAKE_THUMB_ADDR (pc));
+	  next_pcs.push_back (MAKE_THUMB_ADDR (pc));
 	  return next_pcs;
 	}
       else if (itstate != 0)
@@ -335,7 +337,7 @@ thumb_get_next_pcs_raw (struct arm_get_next_pcs *self)
 		  itstate = thumb_advance_itstate (itstate);
 		}
 
-	      VEC_safe_push (CORE_ADDR, next_pcs, MAKE_THUMB_ADDR (pc));
+	      next_pcs.push_back (MAKE_THUMB_ADDR (pc));
 	      return next_pcs;
 	    }
 	  else if ((itstate & 0x0f) == 0x08)
@@ -361,7 +363,7 @@ thumb_get_next_pcs_raw (struct arm_get_next_pcs *self)
 
 	      /* Set a breakpoint on the following instruction.  */
 	      gdb_assert ((itstate & 0x0f) != 0);
-	      VEC_safe_push (CORE_ADDR, next_pcs, MAKE_THUMB_ADDR (pc));
+	      next_pcs.push_back (MAKE_THUMB_ADDR (pc));
 
 	      cond_negated = (itstate >> 4) & 1;
 
@@ -378,7 +380,7 @@ thumb_get_next_pcs_raw (struct arm_get_next_pcs *self)
 		}
 	      while (itstate != 0 && ((itstate >> 4) & 1) == cond_negated);
 
-	      VEC_safe_push (CORE_ADDR, next_pcs, MAKE_THUMB_ADDR (pc));
+	      next_pcs.push_back (MAKE_THUMB_ADDR (pc));
 
 	      return next_pcs;
 	    }
@@ -393,8 +395,7 @@ thumb_get_next_pcs_raw (struct arm_get_next_pcs *self)
 	{
 	  /* Advance to the next instruction.  All the 32-bit
 	     instructions share a common prefix.  */
-	  VEC_safe_push (CORE_ADDR, next_pcs,
-			 MAKE_THUMB_ADDR (pc + thumb_insn_size (inst1)));
+	  next_pcs.push_back (MAKE_THUMB_ADDR (pc + thumb_insn_size (inst1)));
 	}
 
       return next_pcs;
@@ -628,7 +629,7 @@ thumb_get_next_pcs_raw (struct arm_get_next_pcs *self)
 	nextpc = pc_val + imm;
     }
 
-  VEC_safe_push (CORE_ADDR, next_pcs, nextpc);
+  next_pcs.push_back (nextpc);
 
   return next_pcs;
 }
@@ -641,7 +642,7 @@ thumb_get_next_pcs_raw (struct arm_get_next_pcs *self)
    in Thumb-State, and gdbarch_addr_bits_remove () to get the plain memory
    address in GDB and arm_addr_bits_remove in GDBServer.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 arm_get_next_pcs_raw (struct arm_get_next_pcs *self)
 {
   int byte_order = self->byte_order;
@@ -652,7 +653,7 @@ arm_get_next_pcs_raw (struct arm_get_next_pcs *self)
   CORE_ADDR nextpc;
   struct regcache *regcache = self->regcache;
   CORE_ADDR pc = regcache_read_pc (self->regcache);
-  VEC (CORE_ADDR) *next_pcs = NULL;
+  std::vector<CORE_ADDR> next_pcs;
 
   pc_val = (unsigned long) pc;
   this_instr = self->ops->read_mem_uint (pc, 4, byte_order_for_code);
@@ -709,7 +710,7 @@ arm_get_next_pcs_raw (struct arm_get_next_pcs *self)
 			  ? (pc_val + 8)
 			  : regcache_raw_get_unsigned (regcache, rn));
 
-		VEC_safe_push (CORE_ADDR, next_pcs, nextpc);
+		next_pcs.push_back (nextpc);
 		return next_pcs;
 	      }
 
@@ -899,40 +900,36 @@ arm_get_next_pcs_raw (struct arm_get_next_pcs *self)
 	}
     }
 
-  VEC_safe_push (CORE_ADDR, next_pcs, nextpc);
+  next_pcs.push_back (nextpc);
+
   return next_pcs;
 }
 
 /* See arm-get-next-pcs.h.  */
 
-VEC (CORE_ADDR) *
+std::vector<CORE_ADDR>
 arm_get_next_pcs (struct arm_get_next_pcs *self)
 {
-  VEC (CORE_ADDR) *next_pcs = NULL;
+  std::vector<CORE_ADDR> next_pcs;
 
   if (self->ops->is_thumb (self))
     {
       next_pcs = thumb_deal_with_atomic_sequence_raw (self);
-      if (next_pcs == NULL)
+      if (next_pcs.empty ())
 	next_pcs = thumb_get_next_pcs_raw (self);
     }
   else
     {
       next_pcs = arm_deal_with_atomic_sequence_raw (self);
-      if (next_pcs == NULL)
+      if (next_pcs.empty ())
 	next_pcs = arm_get_next_pcs_raw (self);
     }
 
   if (self->ops->fixup != NULL)
     {
-      CORE_ADDR nextpc;
-      int i;
-
-      for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, nextpc); i++)
-	{
-	  nextpc = self->ops->fixup (self, nextpc);
-	  VEC_replace (CORE_ADDR, next_pcs, i, nextpc);
-	}
+      for (CORE_ADDR &pc_ref : next_pcs)
+	pc_ref = self->ops->fixup (self, pc_ref);
     }
+
   return next_pcs;
 }
diff --git a/gdb/arch/arm-get-next-pcs.h b/gdb/arch/arm-get-next-pcs.h
index 2300ac1d7b..c6723be838 100644
--- a/gdb/arch/arm-get-next-pcs.h
+++ b/gdb/arch/arm-get-next-pcs.h
@@ -19,7 +19,8 @@
 
 #ifndef ARM_GET_NEXT_PCS_H
 #define ARM_GET_NEXT_PCS_H 1
-#include "gdb_vecs.h"
+
+#include <vector>
 
 /* Forward declaration.  */
 struct arm_get_next_pcs;
@@ -61,6 +62,6 @@ void arm_get_next_pcs_ctor (struct arm_get_next_pcs *self,
 			    struct regcache *regcache);
 
 /* Find the next possible PCs after the current instruction executes.  */
-VEC (CORE_ADDR) *arm_get_next_pcs (struct arm_get_next_pcs *self);
+std::vector<CORE_ADDR> arm_get_next_pcs (struct arm_get_next_pcs *self);
 
 #endif /* ARM_GET_NEXT_PCS_H */
diff --git a/gdb/arm-linux-tdep.c b/gdb/arm-linux-tdep.c
index e1eab209df..094ed72757 100644
--- a/gdb/arm-linux-tdep.c
+++ b/gdb/arm-linux-tdep.c
@@ -921,22 +921,16 @@ arm_linux_get_next_pcs_syscall_next_pc (struct arm_get_next_pcs *self)
 
 /* Insert a single step breakpoint at the next executed instruction.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 arm_linux_software_single_step (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
   struct arm_get_next_pcs next_pcs_ctx;
-  CORE_ADDR pc;
-  int i;
-  VEC (CORE_ADDR) *next_pcs = NULL;
-  struct cleanup *old_chain;
 
   /* If the target does have hardware single step, GDB doesn't have
      to bother software single step.  */
   if (target_can_do_single_step () == 1)
-    return NULL;
-
-  old_chain = make_cleanup (VEC_cleanup (CORE_ADDR), &next_pcs);
+    return {};
 
   arm_get_next_pcs_ctor (&next_pcs_ctx,
 			 &arm_linux_get_next_pcs_ops,
@@ -945,15 +939,10 @@ arm_linux_software_single_step (struct regcache *regcache)
 			 1,
 			 regcache);
 
-  next_pcs = arm_get_next_pcs (&next_pcs_ctx);
-
-  for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); i++)
-    {
-      pc = gdbarch_addr_bits_remove (gdbarch, pc);
-      VEC_replace (CORE_ADDR, next_pcs, i, pc);
-    }
+  std::vector<CORE_ADDR> next_pcs = arm_get_next_pcs (&next_pcs_ctx);
 
-  discard_cleanups (old_chain);
+  for (CORE_ADDR &pc_ref : next_pcs)
+    pc_ref = gdbarch_addr_bits_remove (gdbarch, pc_ref);
 
   return next_pcs;
 }
diff --git a/gdb/arm-tdep.c b/gdb/arm-tdep.c
index 970d19fcc4..691fae7da6 100644
--- a/gdb/arm-tdep.c
+++ b/gdb/arm-tdep.c
@@ -6295,15 +6295,11 @@ arm_get_next_pcs_is_thumb (struct arm_get_next_pcs *self)
    single-step support.  We find the target of the coming instructions
    and breakpoint them.  */
 
-VEC (CORE_ADDR) *
+std::vector<CORE_ADDR>
 arm_software_single_step (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
   struct arm_get_next_pcs next_pcs_ctx;
-  CORE_ADDR pc;
-  int i;
-  VEC (CORE_ADDR) *next_pcs = NULL;
-  struct cleanup *old_chain = make_cleanup (VEC_cleanup (CORE_ADDR), &next_pcs);
 
   arm_get_next_pcs_ctor (&next_pcs_ctx,
 			 &arm_get_next_pcs_ops,
@@ -6312,15 +6308,10 @@ arm_software_single_step (struct regcache *regcache)
 			 0,
 			 regcache);
 
-  next_pcs = arm_get_next_pcs (&next_pcs_ctx);
-
-  for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); i++)
-    {
-      pc = gdbarch_addr_bits_remove (gdbarch, pc);
-      VEC_replace (CORE_ADDR, next_pcs, i, pc);
-    }
+  std::vector<CORE_ADDR> next_pcs = arm_get_next_pcs (&next_pcs_ctx);
 
-  discard_cleanups (old_chain);
+  for (CORE_ADDR &pc_ref : next_pcs)
+    pc_ref = gdbarch_addr_bits_remove (gdbarch, pc_ref);
 
   return next_pcs;
 }
@@ -7898,11 +7889,6 @@ arm_breakpoint_kind_from_current_state (struct gdbarch *gdbarch,
   if (target_read_memory (regcache_read_pc (regcache), buf, 4) == 0)
     {
       struct arm_get_next_pcs next_pcs_ctx;
-      CORE_ADDR pc;
-      int i;
-      VEC (CORE_ADDR) *next_pcs = NULL;
-      struct cleanup *old_chain
-	= make_cleanup (VEC_cleanup (CORE_ADDR), &next_pcs);
 
       arm_get_next_pcs_ctor (&next_pcs_ctx,
 			     &arm_get_next_pcs_ops,
@@ -7911,17 +7897,15 @@ arm_breakpoint_kind_from_current_state (struct gdbarch *gdbarch,
 			     0,
 			     regcache);
 
-      next_pcs = arm_get_next_pcs (&next_pcs_ctx);
+      std::vector<CORE_ADDR> next_pcs = arm_get_next_pcs (&next_pcs_ctx);
 
       /* If MEMADDR is the next instruction of current pc, do the
 	 software single step computation, and get the thumb mode by
 	 the destination address.  */
-      for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); i++)
+      for (CORE_ADDR pc : next_pcs)
 	{
 	  if (UNMAKE_THUMB_ADDR (pc) == *pcptr)
 	    {
-	      do_cleanups (old_chain);
-
 	      if (IS_THUMB_ADDR (pc))
 		{
 		  *pcptr = MAKE_THUMB_ADDR (*pcptr);
@@ -7931,8 +7915,6 @@ arm_breakpoint_kind_from_current_state (struct gdbarch *gdbarch,
 		return ARM_BP_KIND_ARM;
 	    }
 	}
-
-      do_cleanups (old_chain);
     }
 
   return arm_breakpoint_kind_from_pc (gdbarch, pcptr);
diff --git a/gdb/arm-tdep.h b/gdb/arm-tdep.h
index 8125226362..132978235b 100644
--- a/gdb/arm-tdep.h
+++ b/gdb/arm-tdep.h
@@ -29,6 +29,8 @@ struct gdb_get_next_pcs;
 
 #include "arch/arm.h"
 
+#include <vector>
+
 /* Say how long FP registers are.  Used for documentation purposes and
    code readability in this header.  IEEE extended doubles are 80
    bits.  DWORD aligned they use 96 bits.  */
@@ -259,7 +261,7 @@ CORE_ADDR arm_get_next_pcs_addr_bits_remove (struct arm_get_next_pcs *self,
 
 int arm_get_next_pcs_is_thumb (struct arm_get_next_pcs *self);
 
-VEC (CORE_ADDR) *arm_software_single_step (struct regcache *);
+std::vector<CORE_ADDR> arm_software_single_step (struct regcache *);
 int arm_is_thumb (struct regcache *regcache);
 int arm_frame_is_thumb (struct frame_info *frame);
 
diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
index 67d5988a0c..e8d8d09df5 100644
--- a/gdb/breakpoint.c
+++ b/gdb/breakpoint.c
@@ -15079,22 +15079,18 @@ int
 insert_single_step_breakpoints (struct gdbarch *gdbarch)
 {
   struct regcache *regcache = get_current_regcache ();
-  VEC (CORE_ADDR) * next_pcs;
+  std::vector<CORE_ADDR> next_pcs;
 
   next_pcs = gdbarch_software_single_step (gdbarch, regcache);
 
-  if (next_pcs != NULL)
+  if (!next_pcs.empty ())
     {
-      int i;
-      CORE_ADDR pc;
       struct frame_info *frame = get_current_frame ();
       struct address_space *aspace = get_frame_address_space (frame);
 
-      for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); i++)
+      for (CORE_ADDR pc : next_pcs)
 	insert_single_step_breakpoint (gdbarch, aspace, pc);
 
-      VEC_free (CORE_ADDR, next_pcs);
-
       return 1;
     }
   else
diff --git a/gdb/cris-tdep.c b/gdb/cris-tdep.c
index a46356ff8b..eb397725a7 100644
--- a/gdb/cris-tdep.c
+++ b/gdb/cris-tdep.c
@@ -2060,12 +2060,12 @@ find_step_target (struct regcache *regcache, inst_env_type *inst_env)
    digs through the opcodes in order to find all possible targets.
    Either one ordinary target or two targets for branches may be found.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 cris_software_single_step (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
   inst_env_type inst_env;
-  VEC (CORE_ADDR) *next_pcs = NULL;
+  std::vector<CORE_ADDR> next_pcs;
 
   /* Analyse the present instruction environment and insert 
      breakpoints.  */
@@ -2083,14 +2083,14 @@ cris_software_single_step (struct regcache *regcache)
       CORE_ADDR next_pc
 	= (CORE_ADDR) inst_env.reg[gdbarch_pc_regnum (gdbarch)];
 
-      VEC_safe_push (CORE_ADDR, next_pcs, next_pc);
+      next_pcs.push_back (next_pc);
       if (inst_env.branch_found 
 	  && (CORE_ADDR) inst_env.branch_break_address != next_pc)
 	{
 	  CORE_ADDR branch_target_address
 		= (CORE_ADDR) inst_env.branch_break_address;
 
-	  VEC_safe_push (CORE_ADDR, next_pcs, branch_target_address);
+	  next_pcs.push_back (branch_target_address);
 	}
     }
 
diff --git a/gdb/gdbarch.c b/gdb/gdbarch.c
index 41c086685d..9c827ac653 100644
--- a/gdb/gdbarch.c
+++ b/gdb/gdbarch.c
@@ -3229,7 +3229,7 @@ gdbarch_software_single_step_p (struct gdbarch *gdbarch)
   return gdbarch->software_single_step != NULL;
 }
 
-VEC (CORE_ADDR) *
+std::vector<CORE_ADDR>
 gdbarch_software_single_step (struct gdbarch *gdbarch, struct regcache *regcache)
 {
   gdb_assert (gdbarch != NULL);
diff --git a/gdb/gdbarch.h b/gdb/gdbarch.h
index d59e14905a..442bef165a 100644
--- a/gdb/gdbarch.h
+++ b/gdb/gdbarch.h
@@ -35,6 +35,7 @@
 #ifndef GDBARCH_H
 #define GDBARCH_H
 
+#include <vector>
 #include "frame.h"
 #include "dis-asm.h"
 
@@ -700,8 +701,8 @@ extern void set_gdbarch_addr_bits_remove (struct gdbarch *gdbarch, gdbarch_addr_
 
 extern int gdbarch_software_single_step_p (struct gdbarch *gdbarch);
 
-typedef VEC (CORE_ADDR) * (gdbarch_software_single_step_ftype) (struct regcache *regcache);
-extern VEC (CORE_ADDR) * gdbarch_software_single_step (struct gdbarch *gdbarch, struct regcache *regcache);
+typedef std::vector<CORE_ADDR> (gdbarch_software_single_step_ftype) (struct regcache *regcache);
+extern std::vector<CORE_ADDR> gdbarch_software_single_step (struct gdbarch *gdbarch, struct regcache *regcache);
 extern void set_gdbarch_software_single_step (struct gdbarch *gdbarch, gdbarch_software_single_step_ftype *software_single_step);
 
 /* Return non-zero if the processor is executing a delay slot and a
diff --git a/gdb/gdbarch.sh b/gdb/gdbarch.sh
index 170aae3a3f..68163a1947 100755
--- a/gdb/gdbarch.sh
+++ b/gdb/gdbarch.sh
@@ -640,7 +640,7 @@ m;CORE_ADDR;addr_bits_remove;CORE_ADDR addr;addr;;core_addr_identity;;0
 # the condition and only put the breakpoint at the branch destination if
 # the condition is true, so that we ensure forward progress when stepping
 # past a conditional branch to self.
-F;VEC (CORE_ADDR) *;software_single_step;struct regcache *regcache;regcache
+F;std::vector<CORE_ADDR>;software_single_step;struct regcache *regcache;regcache
 
 # Return non-zero if the processor is executing a delay slot and a
 # further single-step is needed before the instruction finishes.
@@ -1271,6 +1271,7 @@ cat <<EOF
 #ifndef GDBARCH_H
 #define GDBARCH_H
 
+#include <vector>
 #include "frame.h"
 #include "dis-asm.h"
 
diff --git a/gdb/gdbserver/ChangeLog b/gdb/gdbserver/ChangeLog
index 2060d25703..860459e5c8 100644
--- a/gdb/gdbserver/ChangeLog
+++ b/gdb/gdbserver/ChangeLog
@@ -1,3 +1,13 @@
+2017-05-02  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* linux-arm-low.c (arm_gdbserver_get_next_pcs): Adjust to
+	software_single_step change of return type to
+	std::vector<CORE_ADDR>.
+	* linux-low.c (install_software_single_step_breakpoints):
+	Likewise.
+	* linux-low.h (install_software_single_step_breakpoints):
+	Likewise.
+
 2017-04-12  Sergio Durigan Junior  <sergiodj@redhat.com>
 
 	* remote-utils.c: Include "gdb_termios.h" instead of
diff --git a/gdb/gdbserver/linux-arm-low.c b/gdb/gdbserver/linux-arm-low.c
index fc2b34870a..5a3f465dee 100644
--- a/gdb/gdbserver/linux-arm-low.c
+++ b/gdb/gdbserver/linux-arm-low.c
@@ -925,11 +925,10 @@ arm_arch_setup (void)
 
 /* Fetch the next possible PCs after the current instruction executes.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 arm_gdbserver_get_next_pcs (struct regcache *regcache)
 {
   struct arm_get_next_pcs next_pcs_ctx;
-  VEC (CORE_ADDR) *next_pcs = NULL;
 
   arm_get_next_pcs_ctor (&next_pcs_ctx,
 			 &get_next_pcs_ops,
@@ -939,9 +938,7 @@ arm_gdbserver_get_next_pcs (struct regcache *regcache)
 			 1,
 			 regcache);
 
-  next_pcs = arm_get_next_pcs (&next_pcs_ctx);
-
-  return next_pcs;
+  return arm_get_next_pcs (&next_pcs_ctx);
 }
 
 /* Support for hardware single step.  */
diff --git a/gdb/gdbserver/linux-low.c b/gdb/gdbserver/linux-low.c
index e27cbf825a..ea3c81b847 100644
--- a/gdb/gdbserver/linux-low.c
+++ b/gdb/gdbserver/linux-low.c
@@ -4317,19 +4317,14 @@ enqueue_pending_signal (struct lwp_info *lwp, int signal, siginfo_t *info)
 static void
 install_software_single_step_breakpoints (struct lwp_info *lwp)
 {
-  int i;
-  CORE_ADDR pc;
   struct thread_info *thread = get_lwp_thread (lwp);
   struct regcache *regcache = get_thread_regcache (thread, 1);
-  VEC (CORE_ADDR) *next_pcs = NULL;
   struct cleanup *old_chain = make_cleanup_restore_current_thread ();
 
-  make_cleanup (VEC_cleanup (CORE_ADDR), &next_pcs);
-
   current_thread = thread;
-  next_pcs = (*the_low_target.get_next_pcs) (regcache);
+  std::vector<CORE_ADDR> next_pcs = the_low_target.get_next_pcs (regcache);
 
-  for (i = 0; VEC_iterate (CORE_ADDR, next_pcs, i, pc); ++i)
+  for (CORE_ADDR pc : next_pcs)
     set_single_step_breakpoint (pc, current_ptid);
 
   do_cleanups (old_chain);
diff --git a/gdb/gdbserver/linux-low.h b/gdb/gdbserver/linux-low.h
index 7dcbfcfca4..6328da03ed 100644
--- a/gdb/gdbserver/linux-low.h
+++ b/gdb/gdbserver/linux-low.h
@@ -154,7 +154,7 @@ struct linux_target_ops
   const gdb_byte *(*sw_breakpoint_from_kind) (int kind, int *size);
 
   /* Find the next possible PCs after the current instruction executes.  */
-  VEC (CORE_ADDR) *(*get_next_pcs) (struct regcache *regcache);
+  std::vector<CORE_ADDR> (*get_next_pcs) (struct regcache *regcache);
 
   int decr_pc_after_break;
   int (*breakpoint_at) (CORE_ADDR pc);
diff --git a/gdb/mips-tdep.c b/gdb/mips-tdep.c
index 2364c2efdc..f8e68090cf 100644
--- a/gdb/mips-tdep.c
+++ b/gdb/mips-tdep.c
@@ -3879,7 +3879,7 @@ mips_addr_bits_remove (struct gdbarch *gdbarch, CORE_ADDR addr)
 #define SC_OPCODE 0x38
 #define SCD_OPCODE 0x3c
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 mips_deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
 {
   CORE_ADDR breaks[2] = {-1, -1};
@@ -3890,12 +3890,11 @@ mips_deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
   int index;
   int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed).  */  
   const int atomic_sequence_length = 16; /* Instruction sequence length.  */
-  VEC (CORE_ADDR) *next_pcs = NULL;
 
   insn = mips_fetch_instruction (gdbarch, ISA_MIPS, loc, NULL);
   /* Assume all atomic sequences start with a ll/lld instruction.  */
   if (itype_op (insn) != LL_OPCODE && itype_op (insn) != LLD_OPCODE)
-    return NULL;
+    return {};
 
   /* Assume that no atomic sequence is longer than "atomic_sequence_length" 
      instructions.  */
@@ -3912,7 +3911,7 @@ mips_deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
 	{
 	case 0: /* SPECIAL */
 	  if (rtype_funct (insn) >> 1 == 4) /* JR, JALR */
-	    return 0; /* fallback to the standard single-step code.  */
+	    return {}; /* fallback to the standard single-step code.  */
 	  break;
 	case 1: /* REGIMM */
 	  is_branch = ((itype_rt (insn) & 0xc) == 0 /* B{LT,GE}Z* */
@@ -3921,7 +3920,7 @@ mips_deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
 	  break;
 	case 2: /* J */
 	case 3: /* JAL */
-	  return 0; /* fallback to the standard single-step code.  */
+	  return {}; /* fallback to the standard single-step code.  */
 	case 4: /* BEQ */
 	case 5: /* BNE */
 	case 6: /* BLEZ */
@@ -3947,8 +3946,8 @@ mips_deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
 	{
 	  branch_bp = loc + mips32_relative_offset (insn) + 4;
 	  if (last_breakpoint >= 1)
-	    return 0; /* More than one branch found, fallback to the
-			 standard single-step code.  */
+	    return {}; /* More than one branch found, fallback to the
+			  standard single-step code.  */
 	  breaks[1] = branch_bp;
 	  last_breakpoint++;
 	}
@@ -3959,7 +3958,7 @@ mips_deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
 
   /* Assume that the atomic sequence ends with a sc/scd instruction.  */
   if (itype_op (insn) != SC_OPCODE && itype_op (insn) != SCD_OPCODE)
-    return NULL;
+    return {};
 
   loc += MIPS_INSN32_SIZE;
 
@@ -3971,14 +3970,16 @@ mips_deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
   if (last_breakpoint && pc <= breaks[1] && breaks[1] <= breaks[0])
     last_breakpoint = 0;
 
+  std::vector<CORE_ADDR> next_pcs;
+
   /* Effectively inserts the breakpoints.  */
   for (index = 0; index <= last_breakpoint; index++)
-    VEC_safe_push (CORE_ADDR, next_pcs, breaks[index]);
+    next_pcs.push_back (breaks[index]);
 
   return next_pcs;
 }
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 micromips_deal_with_atomic_sequence (struct gdbarch *gdbarch,
 				     CORE_ADDR pc)
 {
@@ -3992,17 +3993,16 @@ micromips_deal_with_atomic_sequence (struct gdbarch *gdbarch,
   ULONGEST insn;
   int insn_count;
   int index;
-  VEC (CORE_ADDR) *next_pcs = NULL;
 
   /* Assume all atomic sequences start with a ll/lld instruction.  */
   insn = mips_fetch_instruction (gdbarch, ISA_MICROMIPS, loc, NULL);
   if (micromips_op (insn) != 0x18)	/* POOL32C: bits 011000 */
-    return NULL;
+    return {};
   loc += MIPS_INSN16_SIZE;
   insn <<= 16;
   insn |= mips_fetch_instruction (gdbarch, ISA_MICROMIPS, loc, NULL);
   if ((b12s4_op (insn) & 0xb) != 0x3)	/* LL, LLD: bits 011000 0x11 */
-    return NULL;
+    return {};
   loc += MIPS_INSN16_SIZE;
 
   /* Assume all atomic sequences end with an sc/scd instruction.  Assume
@@ -4072,7 +4072,7 @@ micromips_deal_with_atomic_sequence (struct gdbarch *gdbarch,
 	    case 0x35: /* J: bits 110101 */
 	    case 0x3d: /* JAL: bits 111101 */
 	    case 0x3c: /* JALX: bits 111100 */
-	      return 0; /* Fall back to the standard single-step code. */
+	      return {}; /* Fall back to the standard single-step code. */
 
 	    case 0x18: /* POOL32C: bits 011000 */
 	      if ((b12s4_op (insn) & 0xb) == 0xb)
@@ -4099,24 +4099,24 @@ micromips_deal_with_atomic_sequence (struct gdbarch *gdbarch,
 	          && b5s5_op (insn) != 0x18)
 				/* JRADDIUSP: bits 010001 11000 */
 	        break;
-	      return NULL; /* Fall back to the standard single-step code. */
+	      return {}; /* Fall back to the standard single-step code. */
 
 	    case 0x33: /* B16: bits 110011 */
-	      return NULL; /* Fall back to the standard single-step code. */
+	      return {}; /* Fall back to the standard single-step code. */
 	    }
 	  break;
 	}
       if (is_branch)
 	{
 	  if (last_breakpoint >= 1)
-	    return NULL; /* More than one branch found, fallback to the
-			 standard single-step code.  */
+	    return {}; /* More than one branch found, fallback to the
+			  standard single-step code.  */
 	  breaks[1] = branch_bp;
 	  last_breakpoint++;
 	}
     }
   if (!sc_found)
-    return NULL;
+    return {};
 
   /* Insert a breakpoint right after the end of the atomic sequence.  */
   breaks[0] = loc;
@@ -4126,14 +4126,16 @@ micromips_deal_with_atomic_sequence (struct gdbarch *gdbarch,
   if (last_breakpoint && pc <= breaks[1] && breaks[1] <= breaks[0])
     last_breakpoint = 0;
 
+  std::vector<CORE_ADDR> next_pcs;
+
   /* Effectively inserts the breakpoints.  */
   for (index = 0; index <= last_breakpoint; index++)
-    VEC_safe_push (CORE_ADDR, next_pcs, breaks[index]);
+    next_pcs.push_back (breaks[index]);
 
   return next_pcs;
 }
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
 {
   if (mips_pc_is_mips (pc))
@@ -4141,7 +4143,7 @@ deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
   else if (mips_pc_is_micromips (gdbarch, pc))
     return micromips_deal_with_atomic_sequence (gdbarch, pc);
   else
-    return NULL;
+    return {};
 }
 
 /* mips_software_single_step() is called just before we want to resume
@@ -4149,22 +4151,21 @@ deal_with_atomic_sequence (struct gdbarch *gdbarch, CORE_ADDR pc)
    or kernel single-step support (MIPS on GNU/Linux for example).  We find
    the target of the coming instruction and breakpoint it.  */
 
-VEC (CORE_ADDR) *
+std::vector<CORE_ADDR>
 mips_software_single_step (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
   CORE_ADDR pc, next_pc;
-  VEC (CORE_ADDR) *next_pcs;
 
   pc = regcache_read_pc (regcache);
-  next_pcs = deal_with_atomic_sequence (gdbarch, pc);
-  if (next_pcs != NULL)
+  std::vector<CORE_ADDR> next_pcs = deal_with_atomic_sequence (gdbarch, pc);
+
+  if (!next_pcs.empty ())
     return next_pcs;
 
   next_pc = mips_next_pc (regcache, pc);
 
-  VEC_safe_push (CORE_ADDR, next_pcs, next_pc);
-  return next_pcs;
+  return {next_pc};
 }
 
 /* Test whether the PC points to the return instruction at the
diff --git a/gdb/mips-tdep.h b/gdb/mips-tdep.h
index ce168cc49c..541a275f30 100644
--- a/gdb/mips-tdep.h
+++ b/gdb/mips-tdep.h
@@ -154,7 +154,8 @@ enum
 };
 
 /* Single step based on where the current instruction will take us.  */
-extern VEC (CORE_ADDR) *mips_software_single_step (struct regcache *regcache);
+extern std::vector<CORE_ADDR> mips_software_single_step
+  (struct regcache *regcache);
 
 /* Strip the ISA (compression) bit off from ADDR.  */
 extern CORE_ADDR mips_unmake_compact_addr (CORE_ADDR addr);
diff --git a/gdb/moxie-tdep.c b/gdb/moxie-tdep.c
index dd7a6f4bfb..2972d5248e 100644
--- a/gdb/moxie-tdep.c
+++ b/gdb/moxie-tdep.c
@@ -299,7 +299,7 @@ moxie_process_readu (CORE_ADDR addr, gdb_byte *buf,
 
 /* Insert a single step breakpoint.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 moxie_software_single_step (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
@@ -309,7 +309,7 @@ moxie_software_single_step (struct regcache *regcache)
   uint32_t tmpu32;
   ULONGEST fp;
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
-  VEC (CORE_ADDR) *next_pcs = NULL;
+  std::vector<CORE_ADDR> next_pcs;
 
   addr = regcache_read_pc (regcache);
 
@@ -337,9 +337,8 @@ moxie_software_single_step (struct regcache *regcache)
 	    case 0x09: /* bleu */
 	      /* Insert breaks on both branches, because we can't currently tell
 		 which way things will go.  */
-	      VEC_safe_push (CORE_ADDR, next_pcs, addr + 2);
-	      VEC_safe_push (CORE_ADDR, next_pcs,
-			     addr + 2 + INST2OFFSET(inst));
+	      next_pcs.push_back (addr + 2);
+	      next_pcs.push_back (addr + 2 + INST2OFFSET(inst));
 	      break;
 	    default:
 	      {
@@ -351,7 +350,7 @@ moxie_software_single_step (struct regcache *regcache)
       else
 	{
 	  /* This is a Form 2 instruction.  They are all 16 bits.  */
-	  VEC_safe_push (CORE_ADDR, next_pcs, addr + 2);
+	  next_pcs.push_back (addr + 2);
 	}
     }
   else
@@ -398,7 +397,7 @@ moxie_software_single_step (struct regcache *regcache)
 	case 0x32: /* udiv.l */
 	case 0x33: /* mod.l */
 	case 0x34: /* umod.l */
-	  VEC_safe_push (CORE_ADDR, next_pcs, addr + 2);
+	  next_pcs.push_back (addr + 2);
 	  break;
 
 	  /* 32-bit instructions.  */
@@ -408,7 +407,7 @@ moxie_software_single_step (struct regcache *regcache)
 	case 0x37: /* sto.b */
 	case 0x38: /* ldo.s */
 	case 0x39: /* sto.s */
-	  VEC_safe_push (CORE_ADDR, next_pcs, addr + 4);
+	  next_pcs.push_back (addr + 4);
 	  break;
 
 	  /* 48-bit instructions.  */
@@ -421,27 +420,26 @@ moxie_software_single_step (struct regcache *regcache)
 	case 0x20: /* ldi.s (immediate) */
 	case 0x22: /* lda.s */
 	case 0x24: /* sta.s */
-	  VEC_safe_push (CORE_ADDR, next_pcs, addr + 6);
+	  next_pcs.push_back (addr + 6);
 	  break;
 
 	  /* Control flow instructions.	 */
 	case 0x03: /* jsra */
 	case 0x1a: /* jmpa */
-	  VEC_safe_push (CORE_ADDR, next_pcs,
-			 moxie_process_readu (addr + 2, buf, 4, byte_order));
+	  next_pcs.push_back (moxie_process_readu (addr + 2, buf, 4,
+						   byte_order));
 	  break;
 
 	case 0x04: /* ret */
 	  regcache_cooked_read_unsigned (regcache, MOXIE_FP_REGNUM, &fp);
-	  VEC_safe_push (CORE_ADDR, next_pcs,
-			 moxie_process_readu (fp + 4, buf, 4, byte_order));
+	  next_pcs.push_back (moxie_process_readu (fp + 4, buf, 4, byte_order));
 	  break;
 
 	case 0x19: /* jsr */
 	case 0x25: /* jmp */
 	  regcache_raw_read (regcache,
 			     (inst >> 4) & 0xf, (gdb_byte *) & tmpu32);
-	  VEC_safe_push (CORE_ADDR, next_pcs, tmpu32);
+	  next_pcs.push_back (tmpu32);
 	  break;
 
 	case 0x30: /* swi */
diff --git a/gdb/nios2-tdep.c b/gdb/nios2-tdep.c
index 3d39451804..c214078921 100644
--- a/gdb/nios2-tdep.c
+++ b/gdb/nios2-tdep.c
@@ -2219,16 +2219,13 @@ nios2_get_next_pc (struct regcache *regcache, CORE_ADDR pc)
 
 /* Implement the software_single_step gdbarch method.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 nios2_software_single_step (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
   CORE_ADDR next_pc = nios2_get_next_pc (regcache, regcache_read_pc (regcache));
-  VEC (CORE_ADDR) *next_pcs = NULL;
 
-  VEC_safe_push (CORE_ADDR, next_pcs, next_pc);
-
-  return next_pcs;
+  return {next_pc};
 }
 
 /* Implement the get_longjump_target gdbarch method.  */
diff --git a/gdb/ppc-tdep.h b/gdb/ppc-tdep.h
index 875ad93b18..8d15ace214 100644
--- a/gdb/ppc-tdep.h
+++ b/gdb/ppc-tdep.h
@@ -76,7 +76,8 @@ int ppc_altivec_support_p (struct gdbarch *gdbarch);
 /* Return non-zero if the architecture described by GDBARCH has
    VSX registers (vsr0 --- vsr63).  */
 int vsx_support_p (struct gdbarch *gdbarch);
-VEC (CORE_ADDR) *ppc_deal_with_atomic_sequence (struct regcache *regcache);
+std::vector<CORE_ADDR> ppc_deal_with_atomic_sequence
+  (struct regcache *regcache);
 
 
 /* Register set description.  */
diff --git a/gdb/rs6000-aix-tdep.c b/gdb/rs6000-aix-tdep.c
index a14e93c66a..7d817bee1d 100644
--- a/gdb/rs6000-aix-tdep.c
+++ b/gdb/rs6000-aix-tdep.c
@@ -673,7 +673,7 @@ branch_dest (struct regcache *regcache, int opcode, int instr,
 
 /* AIX does not support PT_STEP.  Simulate it.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 rs6000_software_single_step (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
@@ -682,14 +682,13 @@ rs6000_software_single_step (struct regcache *regcache)
   CORE_ADDR loc;
   CORE_ADDR breaks[2];
   int opcode;
-  VEC (CORE_ADDR) *next_pcs;
 
   loc = regcache_read_pc (regcache);
 
   insn = read_memory_integer (loc, 4, byte_order);
 
-  next_pcs = ppc_deal_with_atomic_sequence (regcache);
-  if (next_pcs != NULL)
+  std::vector<CORE_ADDR> next_pcs = ppc_deal_with_atomic_sequence (regcache);
+  if (!next_pcs.empty ())
     return next_pcs;
   
   breaks[0] = loc + PPC_INSN_SIZE;
@@ -705,7 +704,8 @@ rs6000_software_single_step (struct regcache *regcache)
       /* ignore invalid breakpoint.  */
       if (breaks[ii] == -1)
 	continue;
-      VEC_safe_push (CORE_ADDR, next_pcs, breaks[ii]);
+
+      next_pcs.push_back (breaks[ii]);
     }
 
   errno = 0;			/* FIXME, don't ignore errors!  */
diff --git a/gdb/rs6000-tdep.c b/gdb/rs6000-tdep.c
index eb784c562f..4072464558 100644
--- a/gdb/rs6000-tdep.c
+++ b/gdb/rs6000-tdep.c
@@ -1165,7 +1165,7 @@ ppc_displaced_step_hw_singlestep (struct gdbarch *gdbarch,
    Load And Reserve instruction and ending with a Store Conditional
    instruction.  If such a sequence is found, attempt to step through it.
    A breakpoint is placed at the end of the sequence.  */
-VEC (CORE_ADDR) *
+std::vector<CORE_ADDR>
 ppc_deal_with_atomic_sequence (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
@@ -1180,11 +1180,10 @@ ppc_deal_with_atomic_sequence (struct regcache *regcache)
   int last_breakpoint = 0; /* Defaults to 0 (no breakpoints placed).  */  
   const int atomic_sequence_length = 16; /* Instruction sequence length.  */
   int bc_insn_count = 0; /* Conditional branch instruction count.  */
-  VEC (CORE_ADDR) *next_pcs = NULL;
 
   /* Assume all atomic sequences start with a Load And Reserve instruction.  */
   if (!IS_LOAD_AND_RESERVE_INSN (insn))
-    return NULL;
+    return {};
 
   /* Assume that no atomic sequence is longer than "atomic_sequence_length" 
      instructions.  */
@@ -1202,8 +1201,8 @@ ppc_deal_with_atomic_sequence (struct regcache *regcache)
           int absolute = insn & 2;
 
           if (bc_insn_count >= 1)
-            return 0; /* More than one conditional branch found, fallback 
-                         to the standard single-step code.  */
+            return {}; /* More than one conditional branch found, fallback
+                          to the standard single-step code.  */
  
 	  if (absolute)
 	    breaks[1] = immediate;
@@ -1221,7 +1220,7 @@ ppc_deal_with_atomic_sequence (struct regcache *regcache)
   /* Assume that the atomic sequence ends with a Store Conditional
      instruction.  */
   if (!IS_STORE_CONDITIONAL_INSN (insn))
-    return NULL;
+    return {};
 
   closing_insn = loc;
   loc += PPC_INSN_SIZE;
@@ -1237,8 +1236,10 @@ ppc_deal_with_atomic_sequence (struct regcache *regcache)
 	  || (breaks[1] >= pc && breaks[1] <= closing_insn)))
     last_breakpoint = 0;
 
+  std::vector<CORE_ADDR> next_pcs;
+
   for (index = 0; index <= last_breakpoint; index++)
-    VEC_safe_push (CORE_ADDR, next_pcs, breaks[index]);
+    next_pcs.push_back (breaks[index]);
 
   return next_pcs;
 }
diff --git a/gdb/s390-linux-tdep.c b/gdb/s390-linux-tdep.c
index 55129d81f4..8139d817d9 100644
--- a/gdb/s390-linux-tdep.c
+++ b/gdb/s390-linux-tdep.c
@@ -725,7 +725,7 @@ s390_is_partial_instruction (struct gdbarch *gdbarch, CORE_ADDR loc, int *len)
    process about 4kiB of it each time, leading to O(n**2) memory and time
    complexity.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 s390_software_single_step (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
@@ -733,33 +733,30 @@ s390_software_single_step (struct regcache *regcache)
   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
   int len;
   uint16_t insn;
-  VEC (CORE_ADDR) *next_pcs = NULL;
 
   /* Special handling only if recording.  */
   if (!record_full_is_used ())
-    return NULL;
+    return {};
 
   /* First, match a partial instruction.  */
   if (!s390_is_partial_instruction (gdbarch, loc, &len))
-    return NULL;
+    return {};
 
   loc += len;
 
   /* Second, look for a branch back to it.  */
   insn = read_memory_integer (loc, 2, byte_order);
   if (insn != 0xa714) /* BRC with mask 1 */
-    return NULL;
+    return {};
 
   insn = read_memory_integer (loc + 2, 2, byte_order);
   if (insn != (uint16_t) -(len / 2))
-    return NULL;
+    return {};
 
   loc += 4;
 
   /* Found it, step past the whole thing.  */
-  VEC_safe_push (CORE_ADDR, next_pcs, loc);
-
-  return next_pcs;
+  return {loc};
 }
 
 static int
diff --git a/gdb/sparc-tdep.c b/gdb/sparc-tdep.c
index 73152ce877..d1e64b4ce3 100644
--- a/gdb/sparc-tdep.c
+++ b/gdb/sparc-tdep.c
@@ -1672,7 +1672,7 @@ sparc_step_trap (struct frame_info *frame, unsigned long insn)
   return 0;
 }
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 sparc_software_single_step (struct regcache *regcache)
 {
   struct gdbarch *arch = get_regcache_arch (regcache);
@@ -1680,7 +1680,7 @@ sparc_software_single_step (struct regcache *regcache)
   CORE_ADDR npc, nnpc;
 
   CORE_ADDR pc, orig_npc;
-  VEC (CORE_ADDR) *next_pcs = NULL;
+  std::vector<CORE_ADDR> next_pcs;
 
   pc = regcache_raw_get_unsigned (regcache, tdep->pc_regnum);
   orig_npc = npc = regcache_raw_get_unsigned (regcache, tdep->npc_regnum);
@@ -1688,10 +1688,10 @@ sparc_software_single_step (struct regcache *regcache)
   /* Analyze the instruction at PC.  */
   nnpc = sparc_analyze_control_transfer (regcache, pc, &npc);
   if (npc != 0)
-    VEC_safe_push (CORE_ADDR, next_pcs, npc);
+    next_pcs.push_back (npc);
 
   if (nnpc != 0)
-    VEC_safe_push (CORE_ADDR, next_pcs, nnpc);
+    next_pcs.push_back (nnpc);
 
   /* Assert that we have set at least one breakpoint, and that
      they're not set at the same spot - unless we're going
diff --git a/gdb/spu-tdep.c b/gdb/spu-tdep.c
index 91b1a0e4d6..08ab19418f 100644
--- a/gdb/spu-tdep.c
+++ b/gdb/spu-tdep.c
@@ -1612,7 +1612,7 @@ spu_memory_remove_breakpoint (struct gdbarch *gdbarch,
 
 /* Software single-stepping support.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 spu_software_single_step (struct regcache *regcache)
 {
   struct gdbarch *gdbarch = get_regcache_arch (regcache);
@@ -1622,7 +1622,7 @@ spu_software_single_step (struct regcache *regcache)
   int offset, reg;
   gdb_byte buf[4];
   ULONGEST lslr;
-  VEC (CORE_ADDR) *next_pcs = NULL;
+  std::vector<CORE_ADDR> next_pcs;
 
   pc = regcache_read_pc (regcache);
 
@@ -1645,7 +1645,7 @@ spu_software_single_step (struct regcache *regcache)
   else
     next_pc = (SPUADDR_ADDR (pc) + 4) & lslr;
 
-  VEC_safe_push (CORE_ADDR, next_pcs, SPUADDR (SPUADDR_SPU (pc), next_pc));
+  next_pcs.push_back (SPUADDR (SPUADDR_SPU (pc), next_pc));
 
   if (is_branch (insn, &offset, &reg))
     {
@@ -1658,8 +1658,7 @@ spu_software_single_step (struct regcache *regcache)
 
       target = target & lslr;
       if (target != next_pc)
-	VEC_safe_push (CORE_ADDR, next_pcs, SPUADDR (SPUADDR_SPU (pc),
-						     target));
+	next_pcs.push_back (SPUADDR (SPUADDR_SPU (pc), target));
     }
 
   return next_pcs;
diff --git a/gdb/tic6x-tdep.c b/gdb/tic6x-tdep.c
index 23b7b280f6..012b749389 100644
--- a/gdb/tic6x-tdep.c
+++ b/gdb/tic6x-tdep.c
@@ -699,15 +699,12 @@ tic6x_get_next_pc (struct regcache *regcache, CORE_ADDR pc)
 
 /* This is the implementation of gdbarch method software_single_step.  */
 
-static VEC (CORE_ADDR) *
+static std::vector<CORE_ADDR>
 tic6x_software_single_step (struct regcache *regcache)
 {
   CORE_ADDR next_pc = tic6x_get_next_pc (regcache, regcache_read_pc (regcache));
-  VEC (CORE_ADDR) *next_pcs = NULL;
 
-  VEC_safe_push (CORE_ADDR, next_pcs, next_pc);
-
-  return next_pcs;
+  return {next_pc};
 }
 
 /* This is the implementation of gdbarch method frame_align.  */