Refactor some X86 Stackwalker bits into parent classes

src/processor/stackwalker_amd64_unittest.cc

 // Copyright (c) 2010, Google 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.
 //     * Redistributions in binary form must reproduce the above
@@ skipping 184 matching lines @@
     RegionFromSection();
     raw_context.rsp = stack_section.start().Value();
 
     StackwalkerAMD64 walker(&system_info, &raw_context, &stack_region, &modules,
                           &supplier, &resolver);
     ASSERT_TRUE(walker.Walk(&call_stack));
     frames = call_stack.frames();
     ASSERT_EQ(2U, frames->size());
 
     StackFrameAMD64 *frame0 = static_cast<StackFrameAMD64 *>(frames->at(0));
+    EXPECT_EQ(StackFrame::FRAME_TRUST_CONTEXT, frame0->trust);

[jimb, 2010/09/30 17:42:57]

It's tested! Yay!

     ASSERT_EQ(StackFrameAMD64::CONTEXT_VALID_ALL, frame0->context_validity);
     EXPECT_EQ("enchiridion", frame0->function_name);
     EXPECT_EQ(0x40000000c0004000ULL, frame0->function_base);
 
     StackFrameAMD64 *frame1 = static_cast<StackFrameAMD64 *>(frames->at(1));
+    EXPECT_EQ(StackFrame::FRAME_TRUST_CFI, frame1->trust);
     ASSERT_EQ((StackFrameAMD64::CONTEXT_VALID_RIP |
                StackFrameAMD64::CONTEXT_VALID_RSP |
                StackFrameAMD64::CONTEXT_VALID_RBP |
                StackFrameAMD64::CONTEXT_VALID_RBX |
                StackFrameAMD64::CONTEXT_VALID_R12 |
                StackFrameAMD64::CONTEXT_VALID_R13 |
                StackFrameAMD64::CONTEXT_VALID_R14 |
                StackFrameAMD64::CONTEXT_VALID_R15),
               frame1->context_validity);
     EXPECT_EQ(expected.rip, frame1->context.rip);
@@ skipping 105 matching lines @@
     .D64(0x5a5beeb38de23be8ULL) // saved %rbx
     .D64(0xf015ee516ad89eabULL) // garbage
     .Mark(&frame1_rsp);         // This effectively sets stack_section.start().
   raw_context.rip = 0x40000000c0004006ULL;
   raw_context.rbp = frame0_rbp.Value();
   raw_context.rbx = 0xed1b02e8cc0fc79cULL; // saved %r12
   raw_context.r12 = 0x26e007b341acfebdULL; // callee's %r12
   raw_context.r13 = 0x40000000c0005510ULL; // return address
   CheckWalk();
 }