MC: Shrink MCDwarfLoc/MCLineEntry

Drop 8 bytes off of `MCDwarfLoc` by restricting the `Isa`, `Column`, and
`Flags` members to appropriate sizes (from `DWARFDebugLine::Row`).
Saves a little over 0.5% off the heap of llc with no real functionality
change.

(I'm looking at `llc` memory usage on `verify-uselistorder.lto.opt.bc`;
see r236629 for details.)

llvm-svn: 241970

1 files changed, 18 insertions, 9 deletions

diff --git a/llvm/include/llvm/MC/MCDwarf.h b/llvm/include/llvm/MC/MCDwarf.h
index c7bed8eccda..1e72dfee4ad 100644
--- a/llvm/include/llvm/MC/MCDwarf.h
+++ b/llvm/include/llvm/MC/MCDwarf.h
@@ -54,13 +54,13 @@ struct MCDwarfFile {
 /// \brief Instances of this class represent the information from a
 /// dwarf .loc directive.
 class MCDwarfLoc {
-  unsigned FileNum;
-  unsigned Line;
-  unsigned Column;
+  uint32_t FileNum;
+  uint32_t Line;
+  uint16_t Column;
   // Flags (see #define's below)
-  unsigned Flags;
-  unsigned Isa;
-  unsigned Discriminator;
+  uint8_t Flags;
+  uint8_t Isa;
+  uint32_t Discriminator;
 
 // Flag that indicates the initial value of the is_stmt_start flag.
 #define DWARF2_LINE_DEFAULT_IS_STMT 1
@@ -107,13 +107,22 @@ public:
   void setLine(unsigned line) { Line = line; }
 
   /// \brief Set the Column of this MCDwarfLoc.
-  void setColumn(unsigned column) { Column = column; }
+  void setColumn(unsigned column) {
+    assert(column <= UINT16_MAX);
+    Column = column;
+  }
 
   /// \brief Set the Flags of this MCDwarfLoc.
-  void setFlags(unsigned flags) { Flags = flags; }
+  void setFlags(unsigned flags) {
+    assert(flags <= UINT8_MAX);
+    Flags = flags;
+  }
 
   /// \brief Set the Isa of this MCDwarfLoc.
-  void setIsa(unsigned isa) { Isa = isa; }
+  void setIsa(unsigned isa) {
+    assert(isa <= UINT8_MAX);
+    Isa = isa;
+  }
 
   /// \brief Set the Discriminator of this MCDwarfLoc.
   void setDiscriminator(unsigned discriminator) {