/*
* Class: org_apache_harmony_drlvm_thread_ThreadHelper
* Method: getThreadIdOffset
* Signature: ()I
*/
VMEXPORT jint JNICALL
Java_org_apache_harmony_drlvm_thread_ThreadHelper_getThreadIdOffset(JNIEnv *env, jclass klass)
{
return (jint)hythread_get_thread_id_offset();
}
/**
* Generates fast path of monitor enter
* the code should not contains safepoint.
*
* @param[in] ss buffer to put the assembly code to
* @param[in] input_param1 register which should point to the object lockword.
* If input_param1 == ecx it reduces one register mov.
* the code use and do not restore ecx, edx, eax registers
*
* @return 0 if success in eax register
*/
char* gen_monitorenter_fast_path_helper(char *ss, const R_Opnd & input_param1) {
if (&input_param1 != &ecx_opnd) {
ss = mov(ss, ecx_opnd, input_param1);
}
#ifdef ASM_MONITOR_HELPER
//get self_id
ss = gen_hythread_self_helper(ss);
ss = mov(ss, edx_opnd, M_Base_Opnd(eax_reg,
hythread_get_thread_id_offset())); // mov edx,dword [eax+off]
ss = mov(ss, eax_opnd, M_Base_Opnd(ecx_reg, 2), size_16); // mov ax,word[ecx+2]
ss = alu(ss, cmp_opc, edx_opnd, eax_opnd, size_16); // cmp dx,ax
ss = branch8(ss, Condition_NZ, Imm_Opnd(size_8, 0)); // jnz check_zero
char *check_zero = ((char *)ss) - 1;
//; ax==dx it's safe to do inc
ss = mov(ss, eax_opnd, M_Base_Opnd(ecx_reg, 1), size_8); // mov al, byte[ecx+1]
//rec_inc:
ss = alu(ss, add_opc, eax_opnd, Imm_Opnd(size_8, 0x8), size_8); // add al,0x8
ss = branch8(ss, Condition_C, Imm_Opnd(size_8, 0)); // jc failed
char *failed1 = ((char *)ss) - 1;
ss = mov(ss, M_Base_Opnd(ecx_reg, 1), eax_opnd, size_8); // mov byte[ecx+1],al
ss = ret(ss, Imm_Opnd(4)); // ret 4
signed offset = (signed)ss - (signed)check_zero - 1;
*check_zero = (char)offset; //check_zero:
ss = test(ss, eax_opnd, eax_opnd, size_16); // test ax,ax
ss = branch8(ss, Condition_NZ, Imm_Opnd(size_8, 0)); // jnz failed
char *failed2 = ((char *)ss) - 1;
ss = prefix(ss, lock_prefix); //; here ax==0.
ss = cmpxchg(ss, M_Base_Opnd(ecx_reg, 2), edx_opnd, size_16); // lock cmpxchg16 [ecx+2],dx
ss = branch8(ss, Condition_NZ, Imm_Opnd(size_8, 0)); // jnz failed
char *failed3 = ((char *)ss) - 1;
#ifdef LOCK_RESERVATION
ss = mov(ss, eax_opnd, M_Base_Opnd(ecx_reg, 1), size_8); // mov al, byte[ecx+1]
ss = test(ss, eax_opnd, Imm_Opnd(size_8, 0x4), size_8); // test al,0x4
ss = branch8(ss, Condition_NZ, Imm_Opnd(size_8, 0)); // jnz finish
char *finish = ((char *)ss) - 1;
ss = alu(ss, add_opc, eax_opnd, Imm_Opnd(size_8, 0x8), size_8); // add al,0x8
ss = mov(ss, M_Base_Opnd(ecx_reg, 1), eax_opnd, size_8); // mov byte[ecx+1],al
offset = (signed)ss - (signed)finish - 1;
*finish = (char)offset; //finish:
#endif
ss = ret(ss, Imm_Opnd(4)); // ret 4
offset = (signed)ss - (signed)failed1 - 1;
*failed1 = (char)offset; //failed:
offset = (signed)ss - (signed)failed2 - 1;
*failed2 = (char)offset;
offset = (signed)ss - (signed)failed3 - 1;
*failed3 = (char)offset;
#endif //ASM_MONITOR_HELPER
// the second attempt to lock monitor
ss = push(ss, ecx_opnd);
ss = call(ss, (char *)hythread_thin_monitor_try_enter);
ss = alu(ss, add_opc, esp_opnd, Imm_Opnd(4)); // pop parameters
return ss;
}
