mirrors/Nim
1
0
Fork 0
mirror of https://github.com/nim-lang/Nim.git synced 2026-04-18 05:20:31 +00:00
Code Issues Packages Projects Releases Wiki Activity

No setjump in GC for emscripten/wasm (#9386)

Browse Source 
(cherry picked from commit dc72cf7564)
This commit is contained in:
Yuriy Glukhov
2018-10-17 01:46:13 +03:00
committed by narimiran
parent b70b633e8e
commit 7cf698442a
1 changed files with 21 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

35
lib/system/gc_common.nim
View File

@@ -236,7 +236,7 @@ else:
# ----------------- stack management --------------------------------------
# inspired from Smart Eiffel
when defined(emscripten):
when defined(emscripten) or defined(wasm):
const stackIncreases = true
elif defined(sparc):
const stackIncreases = false
@@ -332,21 +332,28 @@ elif stackIncreases:
# ---------------------------------------------------------------------------
# Generic code for architectures where addresses increase as the stack grows.
# ---------------------------------------------------------------------------
var
jmpbufSize {.importc: "sizeof(jmp_buf)", nodecl.}: int
# a little hack to get the size of a JmpBuf in the generated C code
# in a platform independent way
when defined(emscripten) or defined(wasm):
var
jmpbufSize {.importc: "sizeof(jmp_buf)", nodecl.}: int
# a little hack to get the size of a JmpBuf in the generated C code
# in a platform independent way
template forEachStackSlotAux(gch, gcMark: untyped) {.dirty.} =
for stack in gch.stack.items():
var max = cast[ByteAddress](gch.stack.bottom)
var sp = cast[ByteAddress](addr(registers)) -% sizeof(pointer)
while sp >=% max:
gcMark(gch, cast[PPointer](sp)[])
sp = sp -% sizeof(pointer)
template forEachStackSlot(gch, gcMark: untyped) {.dirty.} =
var registers {.noinit.}: C_JmpBuf
if c_setjmp(registers) == 0'i32: # To fill the C stack with registers.
for stack in gch.stack.items():
var max = cast[ByteAddress](gch.stack.bottom)
var sp = cast[ByteAddress](addr(registers)) -% sizeof(pointer)
while sp >=% max:
gcMark(gch, cast[PPointer](sp)[])
sp = sp -% sizeof(pointer)
when defined(emscripten) or defined(wasm):
var registers: cint
forEachStackSlotAux(gch, gcMark)
else:
var registers {.noinit.}: C_JmpBuf
if c_setjmp(registers) == 0'i32: # To fill the C stack with registers.
forEachStackSlotAux(gch, gcMark)
else:
# ---------------------------------------------------------------------------