First draft of the sh4 port

src/sh4/constants-sh4.cc

Index: src/sh4/constants-sh4.cc
diff --git a/src/data-flow.cc b/src/sh4/constants-sh4.cc
similarity index 56%
copy from src/data-flow.cc
copy to src/sh4/constants-sh4.cc
index 6a3b05cc86d98b5758ab9115a94f02d6ec798b6b..a1b06d2ebf37d6ed54bc23aba05eeda0c2ad3aa7 100644
--- a/src/data-flow.cc
+++ b/src/sh4/constants-sh4.cc
@@ -1,4 +1,4 @@
-// Copyright 2010 the V8 project authors. All rights reserved.
+// Copyright 2011-2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -27,40 +27,63 @@
 
 #include "v8.h"
 
-#include "data-flow.h"
-#include "scopes.h"
+#if defined(V8_TARGET_ARCH_SH4)
+
+#include "constants-sh4.h"
+
 
 namespace v8 {
 namespace internal {
 
-#ifdef DEBUG
-void BitVector::Print() {
-  bool first = true;
-  PrintF("{");
-  for (int i = 0; i < length(); i++) {
-    if (Contains(i)) {
-      if (!first) PrintF(",");
-      first = false;
-      PrintF("%d", i);
-    }
+// These register names are defined in a way to match the native disassembler
+// formatting. See for example the command "objdump -d <binary file>".
+const char* Registers::names_[kNumRegisters] = {
+  "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
+  "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15",
+};
+
+
+// List of alias names which can be used when referring to SH4 registers.
+const Registers::RegisterAlias Registers::aliases_[] = {
+  {14, "fp"},
+  {15, "sp"},
+  {kNoRegister, NULL}
+};
+
+
+const char* Registers::Name(int reg) {
+  const char* result;
+  if ((0 <= reg) && (reg < kNumRegisters)) {
+    result = names_[reg];
+  } else {
+    result = "noreg";
   }
-  PrintF("}");
+  return result;
 }
-#endif
 
 
-void BitVector::Iterator::Advance() {
-  current_++;
-  uint32_t val = current_value_;
-  while (val == 0) {
-    current_index_++;
-    if (Done()) return;
-    val = target_->data_[current_index_];
-    current_ = current_index_ << 5;
+int Registers::Number(const char* name) {
+  // Look through the canonical names.
+  for (int i = 0; i < kNumRegisters; i++) {
+    if (strcmp(names_[i], name) == 0) {
+      return i;
+    }
+  }
+
+  // Look through the alias names.
+  int i = 0;
+  while (aliases_[i].reg != kNoRegister) {
+    if (strcmp(aliases_[i].name, name) == 0) {
+      return aliases_[i].reg;
+    }
+    i++;
   }
-  val = SkipZeroBytes(val);
-  val = SkipZeroBits(val);
-  current_value_ = val >> 1;
+
+  // No register with the requested name found.
+  return kNoRegister;
 }
 
+
 } }  // namespace v8::internal
+
+#endif  // V8_TARGET_ARCH_SH4