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runtime_safe_heap.js
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147 lines (138 loc) · 6.53 KB
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#if SAFE_HEAP || !MINIMAL_RUNTIME
// In MINIMAL_RUNTIME, setValue() and getValue() are only available when building with safe heap enabled, for heap safety checking.
// In traditional runtime, setValue() and getValue() are always available (although their use is highly discouraged due to perf penalties)
/** @param {number} ptr
@param {number} value
@param {string} type
@param {number|boolean=} noSafe */
function setValue(ptr, value, type, noSafe) {
type = type || 'i8';
if (type.charAt(type.length-1) === '*') type = 'i32'; // pointers are 32-bit
#if SAFE_HEAP
if (noSafe) {
switch(type) {
case 'i1': {{{ makeSetValue('ptr', '0', 'value', 'i1', undefined, undefined, undefined, '1') }}}; break;
case 'i8': {{{ makeSetValue('ptr', '0', 'value', 'i8', undefined, undefined, undefined, '1') }}}; break;
case 'i16': {{{ makeSetValue('ptr', '0', 'value', 'i16', undefined, undefined, undefined, '1') }}}; break;
case 'i32': {{{ makeSetValue('ptr', '0', 'value', 'i32', undefined, undefined, undefined, '1') }}}; break;
case 'i64': {{{ makeSetValue('ptr', '0', 'value', 'i64', undefined, undefined, undefined, '1') }}}; break;
case 'float': {{{ makeSetValue('ptr', '0', 'value', 'float', undefined, undefined, undefined, '1') }}}; break;
case 'double': {{{ makeSetValue('ptr', '0', 'value', 'double', undefined, undefined, undefined, '1') }}}; break;
default: abort('invalid type for setValue: ' + type);
}
} else {
#endif
switch(type) {
case 'i1': {{{ makeSetValue('ptr', '0', 'value', 'i1') }}}; break;
case 'i8': {{{ makeSetValue('ptr', '0', 'value', 'i8') }}}; break;
case 'i16': {{{ makeSetValue('ptr', '0', 'value', 'i16') }}}; break;
case 'i32': {{{ makeSetValue('ptr', '0', 'value', 'i32') }}}; break;
case 'i64': {{{ makeSetValue('ptr', '0', 'value', 'i64') }}}; break;
case 'float': {{{ makeSetValue('ptr', '0', 'value', 'float') }}}; break;
case 'double': {{{ makeSetValue('ptr', '0', 'value', 'double') }}}; break;
default: abort('invalid type for setValue: ' + type);
}
#if SAFE_HEAP
}
#endif
}
/** @param {number} ptr
@param {string} type
@param {number|boolean=} noSafe */
function getValue(ptr, type, noSafe) {
type = type || 'i8';
if (type.charAt(type.length-1) === '*') type = 'i32'; // pointers are 32-bit
#if SAFE_HEAP
if (noSafe) {
switch(type) {
case 'i1': return {{{ makeGetValue('ptr', '0', 'i1', undefined, undefined, undefined, undefined, '1') }}};
case 'i8': return {{{ makeGetValue('ptr', '0', 'i8', undefined, undefined, undefined, undefined, '1') }}};
case 'i16': return {{{ makeGetValue('ptr', '0', 'i16', undefined, undefined, undefined, undefined, '1') }}};
case 'i32': return {{{ makeGetValue('ptr', '0', 'i32', undefined, undefined, undefined, undefined, '1') }}};
case 'i64': return {{{ makeGetValue('ptr', '0', 'i64', undefined, undefined, undefined, undefined, '1') }}};
case 'float': return {{{ makeGetValue('ptr', '0', 'float', undefined, undefined, undefined, undefined, '1') }}};
case 'double': return {{{ makeGetValue('ptr', '0', 'double', undefined, undefined, undefined, undefined, '1') }}};
default: abort('invalid type for getValue: ' + type);
}
} else {
#endif
switch(type) {
case 'i1': return {{{ makeGetValue('ptr', '0', 'i1') }}};
case 'i8': return {{{ makeGetValue('ptr', '0', 'i8') }}};
case 'i16': return {{{ makeGetValue('ptr', '0', 'i16') }}};
case 'i32': return {{{ makeGetValue('ptr', '0', 'i32') }}};
case 'i64': return {{{ makeGetValue('ptr', '0', 'i64') }}};
case 'float': return {{{ makeGetValue('ptr', '0', 'float') }}};
case 'double': return {{{ makeGetValue('ptr', '0', 'double') }}};
default: abort('invalid type for getValue: ' + type);
}
#if SAFE_HEAP
}
#endif
return null;
}
#endif // SAFE_HEAP || !MINIMAL_RUNTIME
#if SAFE_HEAP
/** @param {number|boolean=} isFloat */
function getSafeHeapType(bytes, isFloat) {
switch (bytes) {
case 1: return 'i8';
case 2: return 'i16';
case 4: return isFloat ? 'float' : 'i32';
case 8: return 'double';
default: assert(0);
}
}
#if SAFE_HEAP_LOG
var SAFE_HEAP_COUNTER = 0;
#endif
/** @param {number|boolean=} isFloat */
function SAFE_HEAP_STORE(dest, value, bytes, isFloat) {
#if SAFE_HEAP_LOG
out('SAFE_HEAP store: ' + [dest, value, bytes, isFloat, SAFE_HEAP_COUNTER++]);
#endif
if (dest <= 0) abort('segmentation fault storing ' + bytes + ' bytes to address ' + dest);
if (dest % bytes !== 0) abort('alignment error storing to address ' + dest + ', which was expected to be aligned to a multiple of ' + bytes);
if (dest + bytes > HEAP32[DYNAMICTOP_PTR>>2]) abort('segmentation fault, exceeded the top of the available dynamic heap when storing ' + bytes + ' bytes to address ' + dest + '. DYNAMICTOP=' + HEAP32[DYNAMICTOP_PTR>>2]);
assert(DYNAMICTOP_PTR);
assert(HEAP32[DYNAMICTOP_PTR>>2] <= HEAP8.length);
setValue(dest, value, getSafeHeapType(bytes, isFloat), 1);
}
function SAFE_HEAP_STORE_D(dest, value, bytes) {
SAFE_HEAP_STORE(dest, value, bytes, true);
}
/** @param {number|boolean=} isFloat */
function SAFE_HEAP_LOAD(dest, bytes, unsigned, isFloat) {
if (dest <= 0) abort('segmentation fault loading ' + bytes + ' bytes from address ' + dest);
if (dest % bytes !== 0) abort('alignment error loading from address ' + dest + ', which was expected to be aligned to a multiple of ' + bytes);
if (dest + bytes > HEAP32[DYNAMICTOP_PTR>>2]) abort('segmentation fault, exceeded the top of the available dynamic heap when loading ' + bytes + ' bytes from address ' + dest + '. DYNAMICTOP=' + HEAP32[DYNAMICTOP_PTR>>2]);
assert(DYNAMICTOP_PTR);
assert(HEAP32[DYNAMICTOP_PTR>>2] <= HEAP8.length);
var type = getSafeHeapType(bytes, isFloat);
var ret = getValue(dest, type, 1);
if (unsigned) ret = unSign(ret, parseInt(type.substr(1), 10), 1);
#if SAFE_HEAP_LOG
out('SAFE_HEAP load: ' + [dest, ret, bytes, isFloat, unsigned, SAFE_HEAP_COUNTER++]);
#endif
return ret;
}
function SAFE_HEAP_LOAD_D(dest, bytes, unsigned) {
return SAFE_HEAP_LOAD(dest, bytes, unsigned, true);
}
function SAFE_FT_MASK(value, mask) {
var ret = value & mask;
if (ret !== value) {
abort('Function table mask error: function pointer is ' + value + ' which is masked by ' + mask + ', the likely cause of this is that the function pointer is being called by the wrong type.');
}
return ret;
}
function segfault() {
abort('segmentation fault');
}
function alignfault() {
abort('alignment fault');
}
function ftfault() {
abort('Function table mask error');
}
#endif