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# Constants that depend on whether we are on 32-bit or 64-bit
# the frame is absolutely standard. Stores callee-saved registers,
# return address and some scratch space for arguments.
import sys
if sys.maxint == (2**31 - 1):
WORD = 4
IS_X86_32 = True
IS_X86_64 = False
else:
WORD = 8
IS_X86_32 = False
IS_X86_64 = True
#
# +--------------------+ <== aligned to 16 bytes
# | return address |
# +--------------------+ ----------------------.
# | saved regs | FRAME_FIXED_SIZE |
# +--------------------+ --------------------. |
# | scratch | PASS_ON_MY_FRAME | |
# | space | | |
# +--------------------+ <== aligned to 16 -----' ----'
# All the rest of the data is in a GC-managed variable-size "frame".
# This frame object's address is always stored in the register EBP/RBP.
# A frame is a jit.backend.llsupport.llmodel.JITFRAME = GcArray(Signed).
# The frame's fixed size gives the standard fixed part at the
# start of every frame: the saved value of some registers
if WORD == 4:
# ebp + ebx + esi + edi + 15 extra words = 19 words
FRAME_FIXED_SIZE = 19 + 4 # 4 for vmprof, XXX make more compact!
PASS_ON_MY_FRAME = 15
JITFRAME_FIXED_SIZE = 6 + 8 * 2 # 6 GPR + 8 XMM * 2 WORDS/float
# 'threadlocal_addr' is passed as 2nd argument on the stack,
# and it can be left here for when it is needed. As an additional hack,
# with asmgcc, it is made odd-valued to mean "already seen this frame
# during the previous minor collection".
THREADLOCAL_OFS = (FRAME_FIXED_SIZE + 2) * WORD
else:
# rbp + rbx + r12 + r13 + r14 + r15 + threadlocal + 12 extra words = 19
FRAME_FIXED_SIZE = 19 + 4 # 4 for vmprof, XXX make more compact!
PASS_ON_MY_FRAME = 12
JITFRAME_FIXED_SIZE = 28 # 13 GPR + 15 XMM
# 'threadlocal_addr' is passed as 2nd argument in %esi,
# and is moved into this frame location. As an additional hack,
# with asmgcc, it is made odd-valued to mean "already seen this frame
# during the previous minor collection".
THREADLOCAL_OFS = (FRAME_FIXED_SIZE - 1) * WORD
assert PASS_ON_MY_FRAME >= 12 # asmgcc needs at least JIT_USE_WORDS + 3
# return address, followed by FRAME_FIXED_SIZE words
DEFAULT_FRAME_BYTES = (1 + FRAME_FIXED_SIZE) * WORD
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