Enable native stack walking for allocation profiling

runtime/vm/globals.h

Index: runtime/vm/globals.h
diff --git a/runtime/vm/globals.h b/runtime/vm/globals.h
index 597756d82488e91a128a025571e954ec32fa0875..6903437dc707fe45cccfed490747c5ce974c2390 100644
--- a/runtime/vm/globals.h
+++ b/runtime/vm/globals.h
@@ -90,6 +90,44 @@ static const uword kZapUninitializedWord = 0xabababababababab;
 #endif
 
 
+// Macros to get the contents of sp and fp registers.
+#if defined(TARGET_OS_WINDOWS)
+
+#if defined(TARGET_ARCH_IA32)
+#define COPY_SP_REGISTER(sp) UNIMPLEMENTED();
+#define COPY_FP_REGISTER(fp) UNIMPLEMENTED();
+#elif defined(TARGET_ARCH_X64)
+#define COPY_SP_REGISTER(sp) UNIMPLEMENTED();
+#define COPY_FP_REGISTER(fp) UNIMPLEMENTED();
+#else
+#error Unknown target architecture.
+#endif
+
+#else  // !defined(TARGET_OS_WINDOWS))
+
+// Assume GCC-like inline syntax is valid.
+#if defined(TARGET_ARCH_IA32)
+#define COPY_SP_REGISTER(sp) asm volatile ("movl %%esp, %0" : "=r" (sp) );
+#define COPY_FP_REGISTER(fp) asm volatile ("movl %%ebp, %0" : "=r" (fp) );
+#elif defined(TARGET_ARCH_X64)
+#define COPY_SP_REGISTER(sp) asm volatile ("movq %%rsp, %0" : "=r" (sp) );
+#define COPY_FP_REGISTER(fp) asm volatile ("movq %%rbp, %0" : "=r" (fp) );
+#elif defined(TARGET_ARCH_ARM)
+#define COPY_SP_REGISTER(sp) UNIMPLEMENTED();
+#define COPY_FP_REGISTER(fp) UNIMPLEMENTED();
+#elif defined(TARGET_ARCH_ARM64)
+#define COPY_SP_REGISTER(sp) UNIMPLEMENTED();
+#define COPY_FP_REGISTER(fp) UNIMPLEMENTED();
+#elif defined(TARGET_ARCH_MIPS)
+#define COPY_SP_REGISTER(sp) UNIMPLEMENTED();
+#define COPY_FP_REGISTER(fp) UNIMPLEMENTED();
+#else
+#error Unknown target architecture.
+#endif
+
+
+#endif  // !defined(TARGET_OS_WINDOWS))
+
 }  // namespace dart
 
 #endif  // VM_GLOBALS_H_