diff options
Diffstat (limited to 'src/preamble.js')
| -rw-r--r-- | src/preamble.js | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/src/preamble.js b/src/preamble.js index 0e21f70e..59c3e842 100644 --- a/src/preamble.js +++ b/src/preamble.js @@ -11,6 +11,25 @@ var __ATEXIT__ = []; var HEAP = []; var HEAPTOP = 0; +#if SAFE_HEAP +// Semi-manual memory corruption debugging +HEAP_WATCHED = {}; +function SAFE_HEAP_STORE(dest, value) { + if (dest in HEAP_WATCHED) { + print((new Error()).stack); + throw "Bad store!" + dest; + } + HEAP[dest] = value; +} +function __Z16PROTECT_HEAPADDRPv(dest) { + HEAP_WATCHED[dest] = true; +} +function __Z18UNPROTECT_HEAPADDRPv(dest) { + delete HEAP_WATCHED[dest]; +} +//========================================== +#endif + function abort(text) { text = "ABORT: " + text; print(text + "\n"); @@ -41,7 +60,11 @@ function Pointer_make(slab, pos) { // Finalize var ret = _malloc(Math.max(slab.length - pos, 1)); for (var i = 0; i < slab.length - pos; i++) { +#if SAFE_HEAP + SAFE_HEAP_STORE(ret + i, slab[pos + i]); +#else HEAP[ret + i] = slab[pos + i]; +#endif } return ret; // return { slab: slab, pos: pos ? pos : 0 }; @@ -157,7 +180,11 @@ function _atoi(s) { function _llvm_memcpy_i32(dest, src, num, idunno) { // XXX hardcoded ptr impl for (var i = 0; i < num; i++) { +#if SAFE_HEAP + SAFE_HEAP_STORE(dest + i, HEAP[src + i]); +#else HEAP[dest + i] = HEAP[src + i]; +#endif } // dest = Pointer_niceify(dest); // src = Pointer_niceify(src); |