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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
This commit is contained in:
Duncan P. N. Exon Smith 2015-07-10 23:55:34 +00:00
parent bf6584506f
commit aac65bebd1
1 changed files with 18 additions and 9 deletions
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27
llvm/include/llvm/MC/MCDwarf.h
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@ -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) {