Add new TargetRegistry.
Targets implement a single global Target structure which will live in a new
<Target>/TargetInfo library; this will be present in any image which the target
is usable in.
- Optional target specific classes can then be registered and attached to the
Target description.
- Registration for normal Targets will be done via the initialization functions
instead of using static constructors.
- This allows clients to use a single interface to obtain target data, without
requiring the code generator be linked in. It also provides a natural
extension point for adding new optional target data (assembler parser,
disassembler, etc.).
- This also provides a new entry point for obtaining a target for a particular
triple (without a module).
- Not yet used, however this should eventually replace the TargetMachineRegistry.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75739 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/TargetRegistry.cpp b/lib/Support/TargetRegistry.cpp
new file mode 100644
index 0000000..24f87ce
--- /dev/null
+++ b/lib/Support/TargetRegistry.cpp
@@ -0,0 +1,136 @@
+//===--- TargetRegistry.cpp - Target registration -------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Target/TargetRegistry.h"
+#include <cassert>
+using namespace llvm;
+
+// FIXME: Worry about locking? In general everything should be registered at
+// startup.
+
+static Target *FirstTarget = 0;
+
+const Target *
+TargetRegistry::getClosestStaticTargetForTriple(const std::string &TT,
+ std::string &Error) {
+ Target *Best = 0, *EquallyBest = 0;
+ unsigned BestQuality = 0;
+ // FIXME: Use iterator.
+ for (Target *i = FirstTarget; i; i = i->Next) {
+ if (unsigned Qual = i->TripleMatchQualityFn(TT)) {
+ if (!Best || Qual > BestQuality) {
+ Best = i;
+ EquallyBest = 0;
+ BestQuality = Qual;
+ } else if (Qual == BestQuality)
+ EquallyBest = i;
+ }
+ }
+
+ if (!Best) {
+ Error = "No available targets are compatible with this module";
+ return 0;
+ }
+
+ // Otherwise, take the best target, but make sure we don't have two equally
+ // good best targets.
+ if (EquallyBest) {
+ Error = std::string("Cannot choose between targets \"") +
+ Best->Name + "\" and \"" + EquallyBest->Name + "\"";
+ return 0;
+ }
+
+ return Best;
+}
+
+const Target *
+TargetRegistry::getClosestStaticTargetForModule(const Module &M,
+ std::string &Error) {
+ Target *Best = 0, *EquallyBest = 0;
+ unsigned BestQuality = 0;
+ // FIXME: Use iterator.
+ for (Target *i = FirstTarget; i; i = i->Next) {
+ if (unsigned Qual = i->ModuleMatchQualityFn(M)) {
+ if (!Best || Qual > BestQuality) {
+ Best = i;
+ EquallyBest = 0;
+ BestQuality = Qual;
+ } else if (Qual == BestQuality)
+ EquallyBest = i;
+ }
+ }
+
+ if (!Best) {
+ Error = "No available targets are compatible with this module";
+ return 0;
+ }
+
+ // Otherwise, take the best target, but make sure we don't have two equally
+ // good best targets.
+ if (EquallyBest) {
+ Error = std::string("Cannot choose between targets \"") +
+ Best->Name + "\" and \"" + EquallyBest->Name + "\"";
+ return 0;
+ }
+
+ return Best;
+}
+
+const Target *
+TargetRegistry::getClosestTargetForJIT(std::string &Error) {
+ Target *Best = 0, *EquallyBest = 0;
+ unsigned BestQuality = 0;
+ // FIXME: Use iterator.
+ for (Target *i = FirstTarget; i; i = i->Next) {
+ if (unsigned Qual = i->JITMatchQualityFn()) {
+ if (!Best || Qual > BestQuality) {
+ Best = i;
+ EquallyBest = 0;
+ BestQuality = Qual;
+ } else if (Qual == BestQuality)
+ EquallyBest = i;
+ }
+ }
+
+ if (!Best) {
+ Error = "No JIT is available for this host";
+ return 0;
+ }
+
+ // Return the best, ignoring ties.
+ return Best;
+}
+
+void TargetRegistry::RegisterTarget(Target &T,
+ const char *Name,
+ const char *ShortDesc,
+ Target::TripleMatchQualityFnTy TQualityFn,
+ Target::ModuleMatchQualityFnTy MQualityFn,
+ Target::JITMatchQualityFnTy JITQualityFn) {
+ // Note that we don't require the constructor functions already be defined, in
+ // case a module happens to initialize the optional functionality before the
+ // target.
+ assert(!T.Next && !T.Name && !T.ShortDesc && !T.TripleMatchQualityFn &&
+ !T.ModuleMatchQualityFn && !T.JITMatchQualityFn &&
+ "This Target already registered!");
+
+ assert(Name && ShortDesc && TQualityFn && MQualityFn && JITQualityFn &&
+ "Missing required target information!");
+
+ // Add to the list of targets.
+ T.Next = FirstTarget;
+ FirstTarget = T.Next;
+
+ T.Name = Name;
+ T.ShortDesc = ShortDesc;
+ T.TripleMatchQualityFn = TQualityFn;
+ T.ModuleMatchQualityFn = MQualityFn;
+ T.JITMatchQualityFn = JITQualityFn;
+}
+