Doxygenize the documentation comments

src/IceDefs.h

Index: src/IceDefs.h
diff --git a/src/IceDefs.h b/src/IceDefs.h
index 2ee41a72bf8a9790d08cb7d8c3af17eba31452b0..17e2fb14618c9dba4da24107eda08fecab5a164e 100644
--- a/src/IceDefs.h
+++ b/src/IceDefs.h
@@ -6,10 +6,11 @@
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
-//
-// This file declares various useful types and classes that have widespread use
-// across Subzero.  Every Subzero source file is expected to include IceDefs.h.
-//
+///
+/// \file
+/// This file declares various useful types and classes that have widespread use
+/// across Subzero.  Every Subzero source file is expected to include IceDefs.h.
+///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEDEFS_H
@@ -147,18 +148,18 @@ typedef std::vector<Constant *> ConstantList;
 
 typedef std::vector<VariableDeclaration *> VariableDeclarationList;
 
-// SizeT is for holding small-ish limits like number of source
-// operands in an instruction.  It is used instead of size_t (which
-// may be 64-bits wide) when we want to save space.
+/// SizeT is for holding small-ish limits like number of source
+/// operands in an instruction.  It is used instead of size_t (which
+/// may be 64-bits wide) when we want to save space.
 typedef uint32_t SizeT;
 
-// InstNumberT is for holding an instruction number.  Instruction
-// numbers are used for representing Variable live ranges.
+/// InstNumberT is for holding an instruction number.  Instruction
+/// numbers are used for representing Variable live ranges.
 typedef int32_t InstNumberT;
 
-// A LiveBeginEndMapEntry maps a Variable::Number value to an
-// Inst::Number value, giving the instruction number that begins or
-// ends a variable's live range.
+/// A LiveBeginEndMapEntry maps a Variable::Number value to an
+/// Inst::Number value, giving the instruction number that begins or
+/// ends a variable's live range.
 typedef std::pair<SizeT, InstNumberT> LiveBeginEndMapEntry;
 typedef std::vector<LiveBeginEndMapEntry,
                     CfgLocalAllocator<LiveBeginEndMapEntry>> LiveBeginEndMap;
@@ -167,9 +168,9 @@ typedef llvm::BitVector LivenessBV;
 typedef uint32_t TimerStackIdT;
 typedef uint32_t TimerIdT;
 
-// Use alignas(MaxCacheLineSize) to isolate variables/fields that
-// might be contended while multithreading.  Assumes the maximum cache
-// line size is 64.
+/// Use alignas(MaxCacheLineSize) to isolate variables/fields that
+/// might be contended while multithreading.  Assumes the maximum cache
+/// line size is 64.
 enum { MaxCacheLineSize = 64 };
 // Use ICE_CACHELINE_BOUNDARY to force the next field in a declaration
 // list to be aligned to the next cache line.
@@ -178,26 +179,26 @@ enum { MaxCacheLineSize = 64 };
 #define ICE_CACHELINE_BOUNDARY                                                 \
   __attribute__((aligned(MaxCacheLineSize + 0))) int : 0
 
-// PNaCl is ILP32, so theoretically we should only need 32-bit offsets.
+/// PNaCl is ILP32, so theoretically we should only need 32-bit offsets.
 typedef int32_t RelocOffsetT;
 enum { RelocAddrSize = 4 };
 
 enum LivenessMode {
-  // Basic version of live-range-end calculation.  Marks the last uses
-  // of variables based on dataflow analysis.  Records the set of
-  // live-in and live-out variables for each block.  Identifies and
-  // deletes dead instructions (primarily stores).
+  /// Basic version of live-range-end calculation.  Marks the last uses
+  /// of variables based on dataflow analysis.  Records the set of
+  /// live-in and live-out variables for each block.  Identifies and
+  /// deletes dead instructions (primarily stores).
   Liveness_Basic,
 
-  // In addition to Liveness_Basic, also calculate the complete
-  // live range for each variable in a form suitable for interference
-  // calculation and register allocation.
+  /// In addition to Liveness_Basic, also calculate the complete
+  /// live range for each variable in a form suitable for interference
+  /// calculation and register allocation.
   Liveness_Intervals
 };
 
 enum RegAllocKind {
-  RAK_Global, // full, global register allocation
-  RAK_InfOnly // allocation only for infinite-weight Variables
+  RAK_Global, /// full, global register allocation
+  RAK_InfOnly /// allocation only for infinite-weight Variables
 };
 
 enum VerboseItem {
@@ -221,9 +222,9 @@ enum VerboseItem {
 typedef uint32_t VerboseMask;
 
 enum FileType {
-  FT_Elf, // ELF .o file
-  FT_Asm, // Assembly .s file
-  FT_Iasm // "Integrated assembler" .byte-style .s file
+  FT_Elf, /// ELF .o file
+  FT_Asm, /// Assembly .s file
+  FT_Iasm /// "Integrated assembler" .byte-style .s file
 };
 
 typedef llvm::raw_ostream Ostream;
@@ -233,10 +234,10 @@ typedef std::mutex GlobalLockType;
 
 enum ErrorCodes { EC_None = 0, EC_Args, EC_Bitcode, EC_Translation };
 
-// Wrapper around std::error_code for allowing multiple errors to be
-// folded into one.  The current implementation keeps track of the
-// first error, which is likely to be the most useful one, and this
-// could be extended to e.g. collect a vector of errors.
+/// Wrapper around std::error_code for allowing multiple errors to be
+/// folded into one.  The current implementation keeps track of the
+/// first error, which is likely to be the most useful one, and this
+/// could be extended to e.g. collect a vector of errors.
 class ErrorCode : public std::error_code {
   ErrorCode(const ErrorCode &) = delete;
   ErrorCode &operator=(const ErrorCode &) = delete;
@@ -255,7 +256,7 @@ private:
   bool HasError = false;
 };
 
-// Reverse range adaptors written in terms of llvm::make_range().
+/// Reverse range adaptors written in terms of llvm::make_range().
 template <typename T>
 llvm::iterator_range<typename T::const_reverse_iterator>
 reverse_range(const T &Container) {
@@ -266,7 +267,7 @@ llvm::iterator_range<typename T::reverse_iterator> reverse_range(T &Container) {
   return llvm::make_range(Container.rbegin(), Container.rend());
 }
 
-// Options for pooling and randomization of immediates
+/// Options for pooling and randomization of immediates.
 enum RandomizeAndPoolImmediatesEnum { RPI_None, RPI_Randomize, RPI_Pool };
 
 } // end of namespace Ice