DrSocalkwe3n/luajit
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Correctly align and free allocated machine code areas.

Browse Source 
Bump default mcode area size to 64K for x64.
This commit is contained in:
Mike Pall
2010-02-27 19:53:14 +01:00
parent 52b7651327
commit ec78d3177e
4 changed files with 15 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/lj_mcode.c
View File

@@ -110,10 +110,10 @@ static void mcode_free(jit_State *J, void *p, size_t sz)
/* Get memory within relative jump distance of our code in 64 bit mode. */
static void *mcode_alloc(jit_State *J, size_t sz, int prot)
{
/* Target an address in the static assembler code.
/* Target an address in the static assembler code (64K aligned).
** Try addresses within a distance of target-1GB+1MB .. target+1GB-1MB.
*/
uintptr_t target = (uintptr_t)(void *)lj_vm_exit_handler;
uintptr_t target = (uintptr_t)(void *)lj_vm_exit_handler & ~(uintptr_t)0xffff;
const uintptr_t range = (1u<<31) - (1u << 21);
int i;
/* First try a contiguous area below the last one. */
@@ -128,7 +128,7 @@ static void *mcode_alloc(jit_State *J, size_t sz, int prot)
uintptr_t hint;
void *p;
do {
hint = LJ_PRNG_BITS(J, 15) << 16;
hint = LJ_PRNG_BITS(J, 15) << 16; /* 64K aligned. */
} while (!(hint + sz < range &&
target + hint - (range>>1) < (uintptr_t)1<<47));
p = mcode_alloc_at(J, target + hint - (range>>1), sz, prot);