implement the null function for the Mips32 subzero compiler

src/IceInstMIPS32.cpp

Index: src/IceInstMIPS32.cpp
diff --git a/src/IceInstMIPS32.cpp b/src/IceInstMIPS32.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..4b6e6267bc2c57df2d607a1a601a3104792a9ac2
--- /dev/null
+++ b/src/IceInstMIPS32.cpp
@@ -0,0 +1,62 @@
+//===- subzero/src/IceInstARM32.cpp - ARM32 instruction implementation ----===//

[jvoung (off chromium), 2015/07/07 18:02:35]

ARM32 -> MIPS32 in two places

[reed.kotler, 2015/07/07 21:54:54]

Done.

+//
+//                        The Subzero Code Generator
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the InstARM32 and OperandARM32 classes,

[jvoung (off chromium), 2015/07/07 18:02:34]

MIPS32

Also, for doxygen do:

"""
//===---
///
/// /file
/// This file implements the InstMIPS32 and ...
///
//===----
"""

[reed.kotler, 2015/07/07 21:54:54]

Done.

+// primarily the constructors and the dump()/emit() methods.
+//
+//===----------------------------------------------------------------------===//
+
+#include "IceAssemblerMIPS32.h"
+#include "IceCfg.h"
+#include "IceCfgNode.h"
+#include "IceInst.h"
+#include "IceInstMIPS32.h"
+#include "IceOperand.h"
+#include "IceRegistersMIPS32.h"
+#include "IceTargetLoweringMIPS32.h"
+
+namespace Ice {
+
+namespace {}

[jvoung (off chromium), 2015/07/07 18:02:34]

Jim had a comment about removing this stray namespace {}

[reed.kotler, 2015/07/07 21:54:54]

Done.

+
+InstMIPS32Ret::InstMIPS32Ret(Cfg *Func, Variable *LR, Variable *Source)

[jvoung (off chromium), 2015/07/07 18:02:34]

LR -> RA

[reed.kotler, 2015/07/07 21:54:54]

Done.

+    : InstMIPS32(Func, InstMIPS32::Ret, Source ? 2 : 1, nullptr) {
+  addSource(LR);
+  if (Source)
+    addSource(Source);
+}
+
+void InstMIPS32Ret::emit(const Cfg *Func) const {
+  if (!ALLOW_DUMP)
+    return;
+  assert(getSrcSize() > 0);
+  Variable *LR = llvm::cast<Variable>(getSrc(0));
+  assert(LR->hasReg());
+  assert(LR->getRegNum() == RegMIPS32::Reg_RA);

[jvoung (off chromium), 2015/07/07 18:02:34]

LR -> RA

[reed.kotler, 2015/07/07 21:54:54]

Done.

+  Ostream &Str = Func->getContext()->getStrEmit();
+  Str << "\t"
+      << "jr $ra"

[jvoung (off chromium), 2015/07/07 18:02:34]

no need to print "$ra" here as part of "jr $ra" -- you have RA->emit(Func)
below, which should print the $ra

[reed.kotler, 2015/07/07 21:54:54]

This is needed for now because emitVariable is not implemented yet.
I will remove it when I flesh out that function.

[jvoung (off chromium), 2015/07/08 00:39:11]

Okay.

+      << "\t";
+  LR->emit(Func);
+}
+
+void InstMIPS32Ret::emitIAS(const Cfg *Func) const {
+  (void)Func;
+  llvm_unreachable("Not yet implemented");
+}
+
+void InstMIPS32Ret::dump(const Cfg *Func) const {
+  if (!ALLOW_DUMP)
+    return;
+  Ostream &Str = Func->getContext()->getStrDump();
+  Type Ty = (getSrcSize() == 1 ? IceType_void : getSrc(0)->getType());
+  Str << "ret." << Ty << " ";
+  dumpSources(Func);
+}
+}