Make EmitIntValue more efficient and more like what we do for leb128. The

[oota-llvm.git] / lib / MC / MCObjectWriter.cpp

diff --git a/lib/MC/MCObjectWriter.cpp b/lib/MC/MCObjectWriter.cpp
index d117e82b8a1ff28bb7369a36df20fb3396727c4e..6cee76d0400ac7d35f1bc75b68d3d8efe5b0d9c4 100644 (file)
--- a/lib/MC/MCObjectWriter.cpp
+++ b/lib/MC/MCObjectWriter.cpp
@@ -13,3 +13,29 @@ using namespace llvm;
 
 MCObjectWriter::~MCObjectWriter() {
 }
+
+/// Utility function to encode a SLEB128 value.
+void MCObjectWriter::EncodeSLEB128(int64_t Value, raw_ostream &OS) {
+  bool More;
+  do {
+    uint8_t Byte = Value & 0x7f;
+    // NOTE: this assumes that this signed shift is an arithmetic right shift.
+    Value >>= 7;
+    More = !((((Value == 0 ) && ((Byte & 0x40) == 0)) ||
+              ((Value == -1) && ((Byte & 0x40) != 0))));
+    if (More)
+      Byte |= 0x80; // Mark this byte that that more bytes will follow.
+    OS << char(Byte);
+  } while (More);
+}
+
+/// Utility function to encode a ULEB128 value.
+void MCObjectWriter::EncodeULEB128(uint64_t Value, raw_ostream &OS) {
+  do {
+    uint8_t Byte = Value & 0x7f;
+    Value >>= 7;
+    if (Value != 0)
+      Byte |= 0x80; // Mark this byte that that more bytes will follow.
+    OS << char(Byte);
+  } while (Value != 0);
+}