mirrors/cosmopolitan
1
0
Fork 0
mirror of https://github.com/jart/cosmopolitan.git synced 2025-07-05 10:48:29 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Rewrite brk() and sbrk()

Browse source 
This change reduces the .bss memory requirement for all executables by
O(64kb). The brk system calls are now fully tested and figured out and
might be useful for tiny programs that only target System Five.
This commit is contained in:
Justine Tunney 2022-10-01 23:11:56 -07:00
parent bc8532688b
commit 5005f2e446
No known key found for this signature in database
GPG key ID: BE714B4575D6E328
23 changed files with 643 additions and 294 deletions
Download patch file Download diff file Expand all files Collapse all files

46
libc/runtime/memtrack.internal.h
View file

@ -1,8 +1,6 @@
#ifndef COSMOPOLITAN_LIBC_RUNTIME_MEMTRACK_H_
#define COSMOPOLITAN_LIBC_RUNTIME_MEMTRACK_H_
#include "libc/assert.h"
#include "libc/dce.h"
#include "libc/intrin/midpoint.h"
#include "libc/intrin/nopl.internal.h"
#include "libc/macros.internal.h"
#include "libc/nt/version.h"
@ -31,9 +29,9 @@ struct MemoryInterval {
int y;
long h;
long size;
int prot;
int flags;
long offset;
int flags;
char prot;
bool iscow;
bool readonlyfile;
};
@ -44,20 +42,21 @@ struct MemoryIntervals {
struct MemoryInterval s[OPEN_MAX];
};
extern hidden struct MemoryIntervals _mmi;
extern struct MemoryIntervals _mmi;
void __mmi_lock(void) hidden;
void __mmi_unlock(void) hidden;
bool IsMemtracked(int, int) hidden;
void PrintSystemMappings(int) hidden;
bool AreMemoryIntervalsOk(const struct MemoryIntervals *) nosideeffect hidden;
void PrintMemoryIntervals(int, const struct MemoryIntervals *) hidden;
void __mmi_lock(void);
void __mmi_unlock(void);
bool IsMemtracked(int, int);
void PrintSystemMappings(int);
unsigned FindMemoryInterval(const struct MemoryIntervals *, int) nosideeffect;
bool AreMemoryIntervalsOk(const struct MemoryIntervals *) nosideeffect;
void PrintMemoryIntervals(int, const struct MemoryIntervals *);
int TrackMemoryInterval(struct MemoryIntervals *, int, int, long, int, int,
bool, bool, long, long) hidden;
bool, bool, long, long);
int ReleaseMemoryIntervals(struct MemoryIntervals *, int, int,
void (*)(struct MemoryIntervals *, int, int)) hidden;
void ReleaseMemoryNt(struct MemoryIntervals *, int, int) hidden;
int UntrackMemoryIntervals(void *, size_t) hidden;
void (*)(struct MemoryIntervals *, int, int));
void ReleaseMemoryNt(struct MemoryIntervals *, int, int);
int UntrackMemoryIntervals(void *, size_t);
size_t GetMemtrackSize(struct MemoryIntervals *);
#ifdef _NOPL0
@ -172,23 +171,6 @@ forceinline pureconst bool OverlapsShadowSpace(const void *p, size_t n) {
}
}
forceinline unsigned FindMemoryInterval(const struct MemoryIntervals *mm,
int x) {
unsigned l, m, r;
l = 0;
r = mm->i;
while (l < r) {
m = _midpoint(l, r);
if (mm->p[m].y < x) {
l = m + 1;
} else {
r = m;
}
}
assert(l == mm->i || x <= mm->p[l].y);
return l;
}
COSMOPOLITAN_C_END_
#endif /* !(__ASSEMBLER__ + __LINKER__ + 0) */
#endif /* COSMOPOLITAN_LIBC_RUNTIME_MEMTRACK_H_ */