Move entirety of llvm namespace to wpi namespace.

During shared library loading, a different libLLVM can be pulled in, causing
llvm symbols from dependent libraries to resolve to that library instead of
this one. This has been seen in the wild with the Mesa OpenGL implementation
in JavaFX applications (see wpilibsuite/shuffleboard#361).

This is clearly a very breaking change. For some level of backwards
compatibility, a namespace alias from llvm to wpi is performed in the "llvm"
headers.  Unfortunately, forward declarations of llvm classes will still break,
but compilers seem to generate clear error messages in those cases
("namespace alias 'llvm' not allowed here, assuming 'wpi'").

This change also moves all the wpiutil headers to a single "wpi" subdirectory
from the previously split "llvm", "support", "tcpsockets", and "udpsockets".
Shim headers will be added for backwards compatibility in a later commit.

wpilibc/src/main/native/include/SmartDashboard/SendableBuilder.h

@@ -12,11 +12,11 @@
 #include <string>
 #include <vector>
 
-#include <llvm/ArrayRef.h>
-#include <llvm/SmallVector.h>
-#include <llvm/Twine.h>
 #include <networktables/NetworkTableEntry.h>
 #include <networktables/NetworkTableValue.h>
+#include <wpi/ArrayRef.h>
+#include <wpi/SmallVector.h>
+#include <wpi/Twine.h>
 
 namespace frc {
 
@@ -30,7 +30,7 @@ class SendableBuilder {
    *
    * @param type    data type
    */
-  virtual void SetSmartDashboardType(const llvm::Twine& type) = 0;
+  virtual void SetSmartDashboardType(const wpi::Twine& type) = 0;
 
   /**
    * Set the function that should be called to set the Sendable into a safe
@@ -57,7 +57,7 @@ class SendableBuilder {
    * @param key   property name
    * @return Network table entry
    */
-  virtual nt::NetworkTableEntry GetEntry(const llvm::Twine& key) = 0;
+  virtual nt::NetworkTableEntry GetEntry(const wpi::Twine& key) = 0;
 
   /**
    * Add a boolean property.
@@ -66,7 +66,7 @@ class SendableBuilder {
    * @param getter  getter function (returns current value)
    * @param setter  setter function (sets new value)
    */
-  virtual void AddBooleanProperty(const llvm::Twine& key,
+  virtual void AddBooleanProperty(const wpi::Twine& key,
                                   std::function<bool()> getter,
                                   std::function<void(bool)> setter) = 0;
 
@@ -77,7 +77,7 @@ class SendableBuilder {
    * @param getter  getter function (returns current value)
    * @param setter  setter function (sets new value)
    */
-  virtual void AddDoubleProperty(const llvm::Twine& key,
+  virtual void AddDoubleProperty(const wpi::Twine& key,
                                  std::function<double()> getter,
                                  std::function<void(double)> setter) = 0;
 
@@ -89,8 +89,8 @@ class SendableBuilder {
    * @param setter  setter function (sets new value)
    */
   virtual void AddStringProperty(
-      const llvm::Twine& key, std::function<std::string()> getter,
-      std::function<void(llvm::StringRef)> setter) = 0;
+      const wpi::Twine& key, std::function<std::string()> getter,
+      std::function<void(wpi::StringRef)> setter) = 0;
 
   /**
    * Add a boolean array property.
@@ -100,8 +100,8 @@ class SendableBuilder {
    * @param setter  setter function (sets new value)
    */
   virtual void AddBooleanArrayProperty(
-      const llvm::Twine& key, std::function<std::vector<int>()> getter,
-      std::function<void(llvm::ArrayRef<int>)> setter) = 0;
+      const wpi::Twine& key, std::function<std::vector<int>()> getter,
+      std::function<void(wpi::ArrayRef<int>)> setter) = 0;
 
   /**
    * Add a double array property.
@@ -111,8 +111,8 @@ class SendableBuilder {
    * @param setter  setter function (sets new value)
    */
   virtual void AddDoubleArrayProperty(
-      const llvm::Twine& key, std::function<std::vector<double>()> getter,
-      std::function<void(llvm::ArrayRef<double>)> setter) = 0;
+      const wpi::Twine& key, std::function<std::vector<double>()> getter,
+      std::function<void(wpi::ArrayRef<double>)> setter) = 0;
 
   /**
    * Add a string array property.
@@ -122,8 +122,8 @@ class SendableBuilder {
    * @param setter  setter function (sets new value)
    */
   virtual void AddStringArrayProperty(
-      const llvm::Twine& key, std::function<std::vector<std::string>()> getter,
-      std::function<void(llvm::ArrayRef<std::string>)> setter) = 0;
+      const wpi::Twine& key, std::function<std::vector<std::string>()> getter,
+      std::function<void(wpi::ArrayRef<std::string>)> setter) = 0;
 
   /**
    * Add a raw property.
@@ -132,9 +132,9 @@ class SendableBuilder {
    * @param getter  getter function (returns current value)
    * @param setter  setter function (sets new value)
    */
-  virtual void AddRawProperty(const llvm::Twine& key,
+  virtual void AddRawProperty(const wpi::Twine& key,
                               std::function<std::string()> getter,
-                              std::function<void(llvm::StringRef)> setter) = 0;
+                              std::function<void(wpi::StringRef)> setter) = 0;
 
   /**
    * Add a NetworkTableValue property.
@@ -144,7 +144,7 @@ class SendableBuilder {
    * @param setter  setter function (sets new value)
    */
   virtual void AddValueProperty(
-      const llvm::Twine& key,
+      const wpi::Twine& key,
       std::function<std::shared_ptr<nt::Value>()> getter,
       std::function<void(std::shared_ptr<nt::Value>)> setter) = 0;
 
@@ -156,9 +156,9 @@ class SendableBuilder {
    * @param setter  setter function (sets new value)
    */
   virtual void AddSmallStringProperty(
-      const llvm::Twine& key,
-      std::function<llvm::StringRef(llvm::SmallVectorImpl<char>& buf)> getter,
-      std::function<void(llvm::StringRef)> setter) = 0;
+      const wpi::Twine& key,
+      std::function<wpi::StringRef(wpi::SmallVectorImpl<char>& buf)> getter,
+      std::function<void(wpi::StringRef)> setter) = 0;
 
   /**
    * Add a boolean array property (SmallVector form).
@@ -168,10 +168,10 @@ class SendableBuilder {
    * @param setter  setter function (sets new value)
    */
   virtual void AddSmallBooleanArrayProperty(
-      const llvm::Twine& key,
-      std::function<llvm::ArrayRef<int>(llvm::SmallVectorImpl<int>& buf)>
+      const wpi::Twine& key,
+      std::function<wpi::ArrayRef<int>(wpi::SmallVectorImpl<int>& buf)>
           getter,
-      std::function<void(llvm::ArrayRef<int>)> setter) = 0;
+      std::function<void(wpi::ArrayRef<int>)> setter) = 0;
 
   /**
    * Add a double array property (SmallVector form).
@@ -181,10 +181,10 @@ class SendableBuilder {
    * @param setter  setter function (sets new value)
    */
   virtual void AddSmallDoubleArrayProperty(
-      const llvm::Twine& key,
-      std::function<llvm::ArrayRef<double>(llvm::SmallVectorImpl<double>& buf)>
+      const wpi::Twine& key,
+      std::function<wpi::ArrayRef<double>(wpi::SmallVectorImpl<double>& buf)>
           getter,
-      std::function<void(llvm::ArrayRef<double>)> setter) = 0;
+      std::function<void(wpi::ArrayRef<double>)> setter) = 0;
 
   /**
    * Add a string array property (SmallVector form).
@@ -194,11 +194,11 @@ class SendableBuilder {
    * @param setter  setter function (sets new value)
    */
   virtual void AddSmallStringArrayProperty(
-      const llvm::Twine& key,
+      const wpi::Twine& key,
       std::function<
-          llvm::ArrayRef<std::string>(llvm::SmallVectorImpl<std::string>& buf)>
+          wpi::ArrayRef<std::string>(wpi::SmallVectorImpl<std::string>& buf)>
           getter,
-      std::function<void(llvm::ArrayRef<std::string>)> setter) = 0;
+      std::function<void(wpi::ArrayRef<std::string>)> setter) = 0;
 
   /**
    * Add a raw property (SmallVector form).
@@ -208,9 +208,9 @@ class SendableBuilder {
    * @param setter  setter function (sets new value)
    */
   virtual void AddSmallRawProperty(
-      const llvm::Twine& key,
-      std::function<llvm::StringRef(llvm::SmallVectorImpl<char>& buf)> getter,
-      std::function<void(llvm::StringRef)> setter) = 0;
+      const wpi::Twine& key,
+      std::function<wpi::StringRef(wpi::SmallVectorImpl<char>& buf)> getter,
+      std::function<void(wpi::StringRef)> setter) = 0;
 };
 
 }  // namespace frc