Subzero: Add basic ELFObjectWriter (text section, symtab, strtab, headers)

src/assembler_ia32.cpp

Index: src/assembler_ia32.cpp
diff --git a/src/assembler_ia32.cpp b/src/assembler_ia32.cpp
index 8857a57cdce6b9040dc57d6b98d7a8452dbae398..1c58527cd1fbe745b3ea9944ea5aa5ff53637e6e 100644
--- a/src/assembler_ia32.cpp
+++ b/src/assembler_ia32.cpp
@@ -20,7 +20,6 @@
 
 #include "assembler_ia32.h"
 #include "IceCfg.h"
-#include "IceMemoryRegion.h"
 #include "IceOperand.h"
 
 namespace Ice {
@@ -37,13 +36,6 @@ public:
         DirectCallRelocation(Kind, Sym);
   }
 
-  void Process(const MemoryRegion &region, intptr_t position) override {
-    // Direct calls are relative to the following instruction on x86.
-    int32_t pointer = region.Load<int32_t>(position);
-    int32_t delta = region.start() + position + sizeof(int32_t);
-    region.Store<int32_t>(position, pointer - delta);
-  }
-
 private:
   DirectCallRelocation(FixupKind Kind, const ConstantRelocatable *Sym)
       : AssemblerFixup(Kind, Sym) {}
@@ -78,6 +70,22 @@ AssemblerX86::~AssemblerX86() {
 #endif
 }
 
+void AssemblerX86::alignFunction() {
+  intptr_t Pos = buffer_.GetPosition();
+  SizeT Align = 1 << getBundleAlignLog2Bytes();
+  intptr_t Mod = Pos & (Align - 1);
+  if (Mod == 0) {
+    return;
+  }
+  SizeT BytesNeeded = Align - Mod;
+  const SizeT HltSize = 1;
+  while (BytesNeeded > 0) {
+    hlt();
+    BytesNeeded -= HltSize;
+  }
+  assert((buffer_.GetPosition() & (Align - 1)) == 0);
+}
+
 Label *AssemblerX86::GetOrCreateLabel(SizeT Number, LabelVector &Labels) {
   Label *L = nullptr;
   if (Number == Labels.size()) {