X87: Refactor BreakLocationIterator

src/x87/assembler-x87.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // All Rights Reserved.
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions
 // are met:
 //
 // - Redistributions of source code must retain the above copyright notice,
 // this list of conditions and the following disclaimer.
 //
@@ skipping 84 matching lines @@
   // code object moves.
   return (1 << rmode_) & kApplyMask;
 }
 
 
 bool RelocInfo::IsInConstantPool() {
   return false;
 }
 
 
+// Patch the code at the current PC with a call to the target address.
+// Additional guard int3 instructions can be added if required.
+void RelocInfo::PatchCodeWithCall(Address target, int guard_bytes) {
+  // Call instruction takes up 5 bytes and int3 takes up one byte.
+  static const int kCallCodeSize = 5;
+  int code_size = kCallCodeSize + guard_bytes;
+
+  // Create a code patcher.
+  CodePatcher patcher(pc_, code_size);
+
+// Add a label for checking the size of the code used for returning.
+#ifdef DEBUG
+  Label check_codesize;
+  patcher.masm()->bind(&check_codesize);
+#endif
+
+  // Patch the code.
+  patcher.masm()->call(target, RelocInfo::NONE32);
+
+  // Check that the size of the code generated is as expected.
+  DCHECK_EQ(kCallCodeSize,
+            patcher.masm()->SizeOfCodeGeneratedSince(&check_codesize));
+
+  // Add the requested number of int3 instructions after the call.
+  DCHECK_GE(guard_bytes, 0);
+  for (int i = 0; i < guard_bytes; i++) {
+    patcher.masm()->int3();
+  }
+}
+
+
 // -----------------------------------------------------------------------------
 // Implementation of Operand
 
 Operand::Operand(Register base, int32_t disp, RelocInfo::Mode rmode) {
   // [base + disp/r]
   if (disp == 0 && RelocInfo::IsNone(rmode) && !base.is(ebp)) {
     // [base]
     set_modrm(0, base);
     if (base.is(esp)) set_sib(times_1, esp, base);
   } else if (is_int8(disp) && RelocInfo::IsNone(rmode)) {
@@ skipping 1937 matching lines @@
     fprintf(coverage_log, "%s\n", file_line);
     fflush(coverage_log);
   }
 }
 
 #endif
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X87