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'lineinfo' in prototypes saved as differences instead of absolute

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values, so that the array can use bytes instead of ints, reducing
its size. (A new array 'abslineinfo' is used when line differences
do not fit in a byte.)
This commit is contained in:
Roberto Ierusalimschy
2017-06-27 08:35:31 -03:00
parent 60a7492d24
commit b42430fd3a
11 changed files with 195 additions and 33 deletions
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25
lobject.h
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@@ -1,5 +1,5 @@
/*
** $Id: lobject.h,v 2.122 2017/06/09 16:48:44 roberto Exp roberto $
** $Id: lobject.h,v 2.123 2017/06/12 14:21:44 roberto Exp roberto $
** Type definitions for Lua objects
** See Copyright Notice in lua.h
*/
@@ -417,6 +417,21 @@ typedef struct LocVar {
} LocVar;
/*
** Associates the absolute line source for a given instruction ('pc').
** The array 'lineinfo' gives, for each instruction, the difference in
** lines from the previous instruction. When that difference does not
** fit into a byte, Lua saves the absolute line for that instruction.
** (Lua also saves the absolute line periodically, to speed up the
** computation of a line number: we can use binary search in the
** absolute-line array, but we must traverse the 'lineinfo' array
** linearly to compute a line.)
*/
typedef struct AbsLineInfo {
int pc;
int line;
} AbsLineInfo;
/*
** Function Prototypes
*/
@@ -432,15 +447,17 @@ typedef struct Proto {
int sizelineinfo;
int sizep; /* size of 'p' */
int sizelocvars;
int sizeabslineinfo; /* size of 'abslineinfo' */
int linedefined; /* debug information */
int lastlinedefined; /* debug information */
TValue *k; /* constants used by the function */
struct LClosure *cache; /* last-created closure with this prototype */
Instruction *code; /* opcodes */
struct Proto **p; /* functions defined inside the function */
int *lineinfo; /* map from opcodes to source lines (debug information) */
LocVar *locvars; /* information about local variables (debug information) */
Upvaldesc *upvalues; /* upvalue information */
struct LClosure *cache; /* last-created closure with this prototype */
ls_byte *lineinfo; /* information about source lines (debug information) */
AbsLineInfo *abslineinfo; /* idem */
LocVar *locvars; /* information about local variables (debug information) */
TString *source; /* used for debug information */
GCObject *gclist;
} Proto;