::: HACK ALERT ::: HACK ALERT ::: HACK ALERT ::: HACK ALERT ::: HACK ALERT :::

The JIT is designed to code-generate a function at-a-time. That means that any
pass can only make local changes to its function. Period.

Because the Sparc PreSelection pass claims to be a BasicBlock pass while adding
globals to the Module, it cannot be run with the other passes, because by this
time, the globals have been output already by the JIT, and the addresses of any
globals appearing AFTER this point are not recognized.

However, the PreSelection pass is a requirement for correctness in the Sparc
codegen path, so it MUST be run.

::: HACK ALERT ::: HACK ALERT ::: HACK ALERT ::: HACK ALERT ::: HACK ALERT :::


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6650 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 14 insertions, 1 deletions

diff --git a/lib/ExecutionEngine/JIT/JIT.cpp b/lib/ExecutionEngine/JIT/JIT.cpp
index 2e7236b5d5..fd41c4c127 100644
--- a/lib/ExecutionEngine/JIT/JIT.cpp
+++ b/lib/ExecutionEngine/JIT/JIT.cpp
@@ -11,6 +11,9 @@
 #include "llvm/Module.h"
 #include "Support/CommandLine.h"
 
+// FIXME: REMOVE THIS
+#include "llvm/PassManager.h"
+
 namespace {
   cl::opt<std::string>
   Arch("march", cl::desc("Architecture: `x86' or `sparc'"), cl::Prefix,
@@ -27,7 +30,6 @@ namespace {
 
 }
 
-
 /// createJIT - Create an return a new JIT compiler if there is one available
 /// for the current target.  Otherwise it returns null.
 ///
@@ -65,6 +67,17 @@ VM::VM(Module *M, TargetMachine *tm) : ExecutionEngine(M), TM(*tm) {
   MCE = createEmitter(*this);
 
   setupPassManager();
+
+  // THIS GOES BEYOND UGLY HACKS
+  if (TM.getName() == "UltraSparc-Native") {
+    extern Pass *createPreSelectionPass(TargetMachine &TM);
+    PassManager PM;
+    // Specialize LLVM code for this target machine and then
+    // run basic dataflow optimizations on LLVM code.
+    PM.add(createPreSelectionPass(TM));
+    PM.run(*M);
+  }
+
   emitGlobals();
 }