Disassembler for x64.

runtime/vm/disassembler_x64.cc

Index: runtime/vm/disassembler_x64.cc
===================================================================
--- runtime/vm/disassembler_x64.cc	(revision 1951)
+++ runtime/vm/disassembler_x64.cc	(working copy)
@@ -2,6 +2,11 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
 #include "vm/globals.h"  // Needed here to get TARGET_ARCH_X64.
 #if defined(TARGET_ARCH_X64)
 
@@ -11,6 +16,85 @@
 
 namespace dart {
 
+void Disassembler::Disassemble(uword start,
+                               uword end,
+                               DisassemblyFormatter* formatter) {
+  // First print the actual addresses so that we know where in memory this is
+  // being disassembled from.
+  formatter->Print("start: %p  end: %p\n", start, end);
+
+  // Write code block to tmp file.
+  char tmp[] = "/tmp/codeblock.XXXXXX";
+  int fd = mkstemp(tmp);
+  if (fd < 0) {
+    int errsv = errno;
+    formatter->Print("Could not open tmp file %s, errno=%s\n",
+                     tmp,
+                     strerror(errsv));
+    return;  // failed
+  }
+  ssize_t size = write(fd, reinterpret_cast<const void*>(start), end - start);
+  if (size <= 0) {
+    if (size < 0) {
+      int errsv = errno;
+      formatter->Print("Could not write to tmp file %s, errno=%s\n",
+                       tmp,
+                       strerror(errsv));
+    }
+    close(fd);
+    remove(tmp);
+    return;
+  }
+  close(fd);
+
+  // Disassemble tmp file to stdout.
+  char cmd[256];
+#if defined(__APPLE__)
+  snprintf(cmd, sizeof(cmd),
+           "( cat %1$s | "
+           "  hexdump -v -e '\".byte \" 1/1 \"0x%%02x\" \"\n\"' | "
+           "  as - -arch x86_64 -o %1$s.o ; otool -tV %1$s.o"
+           ") </dev/null 2>&1", tmp);
+#else
+  snprintf(cmd, sizeof(cmd), "( /usr/bin/objdump -b binary -m i386:x86-64 -D %s"
+          " ) </dev/null 2>&1", tmp);
+#endif
+  FILE* output = popen(cmd, "r");
+  if (output == NULL) {
+    int errsv = errno;
+    formatter->Print("Could not run \"%s\", errno=%s\n", cmd, strerror(errsv));
+    remove(tmp);
+    return;  // failed
+  }
+  const int kMaxOutputLine = 1024;
+  char line[kMaxOutputLine];
+#if defined(__APPLE__)
+  const char* header = "(__TEXT,__text) section\n";
+#else
+  const char* header = "<.data>:\n";
+#endif
+  char* header_pos = NULL;
+  while (header_pos == NULL && fgets(line, sizeof(line), output) != NULL) {
+    header_pos = strstr(line, header);
+    if (header_pos != NULL) {
+      formatter->Print("%s", header_pos + strlen(header));
+    }
+  }
+  while (fgets(line, sizeof(line), output) != NULL) {
+    formatter->Print("%s", line);
+  }
+  pclose(output);
+
+  // Delete tmp files.
+  remove(tmp);
+#if defined(__APPLE__)
+  char tmp_o[32];
+  snprintf(tmp_o, sizeof(tmp_o), "%s.o", tmp);
+  remove(tmp_o);
+#endif
+}
+
+
 int Disassembler::DecodeInstruction(char* hexa_buffer, intptr_t hexa_size,
                                     char* human_buffer, intptr_t human_size,
                                     uword pc) {
@@ -18,12 +102,6 @@
   return 0;
 }
 
-
-const char* Disassembler::RegisterName(Register reg) {
-  UNIMPLEMENTED();
-  return NULL;
-}
-
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64