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/*
* Copyright 2015 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <limits>
#include "optimizer.h"
#include "support/safe_integer.h"
using namespace cashew;
IString ASM_FLOAT_ZERO;
IString SIMD_INT8X16_CHECK("SIMD_Int8x16_check"),
SIMD_INT16X8_CHECK("SIMD_Int16x8_check"),
SIMD_INT32X4_CHECK("SIMD_Int32x4_check"),
SIMD_FLOAT32X4_CHECK("SIMD_Float32x4_check"),
SIMD_FLOAT64X2_CHECK("SIMD_Float64x2_check");
int parseInt(const char *str) {
int ret = *str - '0';
while (*(++str)) {
ret *= 10;
ret += *str - '0';
}
return ret;
}
HeapInfo parseHeap(const char *name) {
HeapInfo ret;
if (name[0] != 'H' || name[1] != 'E' || name[2] != 'A' || name[3] != 'P') {
ret.valid = false;
return ret;
}
ret.valid = true;
ret.unsign = name[4] == 'U';
ret.floaty = name[4] == 'F';
ret.bits = parseInt(name + (ret.unsign || ret.floaty ? 5 : 4));
ret.type = !ret.floaty ? ASM_INT : (ret.bits == 64 ? ASM_DOUBLE : ASM_FLOAT);
return ret;
}
AsmType detectType(Ref node, AsmData *asmData, bool inVarDef, IString minifiedFround, bool allowI64) {
if (node->isNumber()) {
if (!wasm::isInteger(node->getNumber())) return ASM_DOUBLE;
return ASM_INT;
}
switch (node[0]->getCString()[0]) {
case 'n': {
if (node[0] == NAME) {
if (asmData) {
AsmType ret = asmData->getType(node[1]->getCString());
if (ret != ASM_NONE) return ret;
}
if (!inVarDef) {
if (node[1] == INF || node[1] == NaN) return ASM_DOUBLE;
if (node[1] == TEMP_RET0) return ASM_INT;
return ASM_NONE;
}
// We are in a variable definition, where Math_fround(0) optimized into a global constant becomes f0 = Math_fround(0)
if (ASM_FLOAT_ZERO.isNull()) ASM_FLOAT_ZERO = node[1]->getIString();
else assert(node[1] == ASM_FLOAT_ZERO);
return ASM_FLOAT;
}
break;
}
case 'u': {
if (node[0] == UNARY_PREFIX) {
switch (node[1]->getCString()[0]) {
case '+': return ASM_DOUBLE;
case '-': return detectType(node[2], asmData, inVarDef, minifiedFround, allowI64);
case '!': case '~': return ASM_INT;
}
break;
}
break;
}
case 'c': {
if (node[0] == CALL) {
if (node[1][0] == NAME) {
IString name = node[1][1]->getIString();
if (name == MATH_FROUND || name == minifiedFround) return ASM_FLOAT;
else if (allowI64 && (name == INT64 || name == INT64_CONST)) return ASM_INT64;
else if (name == SIMD_FLOAT32X4 || name == SIMD_FLOAT32X4_CHECK) return ASM_FLOAT32X4;
else if (name == SIMD_FLOAT64X2 || name == SIMD_FLOAT64X2_CHECK) return ASM_FLOAT64X2;
else if (name == SIMD_INT8X16 || name == SIMD_INT8X16_CHECK) return ASM_INT8X16;
else if (name == SIMD_INT16X8 || name == SIMD_INT16X8_CHECK) return ASM_INT16X8;
else if (name == SIMD_INT32X4 || name == SIMD_INT32X4_CHECK) return ASM_INT32X4;
}
return ASM_NONE;
} else if (node[0] == CONDITIONAL) {
return detectType(node[2], asmData, inVarDef, minifiedFround, allowI64);
}
break;
}
case 'b': {
if (node[0] == BINARY) {
switch (node[1]->getCString()[0]) {
case '+': case '-':
case '*': case '/': case '%': return detectType(node[2], asmData, inVarDef, minifiedFround, allowI64);
case '|': case '&': case '^': case '<': case '>': // handles <<, >>, >>=, <=, >=
case '=': case '!': { // handles ==, !=
return ASM_INT;
}
}
}
break;
}
case 's': {
if (node[0] == SEQ) {
return detectType(node[2], asmData, inVarDef, minifiedFround, allowI64);
} else if (node[0] == SUB) {
assert(node[1][0] == NAME);
HeapInfo info = parseHeap(node[1][1]->getCString());
if (info.valid) return ASM_NONE;
return info.floaty ? ASM_DOUBLE : ASM_INT; // XXX ASM_FLOAT?
}
break;
}
}
//dump("horrible", node);
//assert(0);
return ASM_NONE;
}
static void abort_on(Ref node) {
node->stringify(std::cerr);
std::cerr << '\n';
abort();
}
AsmSign detectSign(Ref node, IString minifiedFround) {
if (node->isNumber()) {
double value = node->getNumber();
if (value < 0) return ASM_SIGNED;
if (value > uint32_t(-1) || fmod(value, 1) != 0) return ASM_NONSIGNED;
if (wasm::isSInteger32(value)) return ASM_FLEXIBLE;
return ASM_UNSIGNED;
}
IString type = node[0]->getIString();
if (type == BINARY) {
IString op = node[1]->getIString();
switch (op.str[0]) {
case '>': {
if (op == TRSHIFT) return ASM_UNSIGNED;
// fallthrough
}
case '|': case '&': case '^': case '<': case '=': case '!': return ASM_SIGNED;
case '+': case '-': return ASM_FLEXIBLE;
case '*': case '/': return ASM_NONSIGNED; // without a coercion, these are double
default: abort_on(node);
}
} else if (type == UNARY_PREFIX) {
IString op = node[1]->getIString();
switch (op.str[0]) {
case '-': return ASM_FLEXIBLE;
case '+': return ASM_NONSIGNED; // XXX double
case '~': return ASM_SIGNED;
default: abort_on(node);
}
} else if (type == NAME) {
return ASM_FLEXIBLE;
} else if (type == CONDITIONAL) {
return detectSign(node[2], minifiedFround);
} else if (type == CALL) {
if (node[1][0] == NAME && (node[1][1] == MATH_FROUND || node[1][1] == minifiedFround)) return ASM_NONSIGNED;
} else if (type == SEQ) {
return detectSign(node[2], minifiedFround);
}
abort_on(node);
abort(); // avoid warning
}
Ref makeAsmCoercedZero(AsmType type) {
switch (type) {
case ASM_INT: return ValueBuilder::makeNum(0); break;
case ASM_DOUBLE: return ValueBuilder::makeUnary(PLUS, ValueBuilder::makeNum(0)); break;
case ASM_FLOAT: {
if (!ASM_FLOAT_ZERO.isNull()) {
return ValueBuilder::makeName(ASM_FLOAT_ZERO);
} else {
return ValueBuilder::makeCall(MATH_FROUND, ValueBuilder::makeNum(0));
}
break;
}
case ASM_FLOAT32X4: {
return ValueBuilder::makeCall(SIMD_FLOAT32X4, ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0));
break;
}
case ASM_FLOAT64X2: {
return ValueBuilder::makeCall(SIMD_FLOAT64X2, ValueBuilder::makeNum(0), ValueBuilder::makeNum(0));
break;
}
case ASM_INT8X16: {
return ValueBuilder::makeCall(SIMD_INT8X16, ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0));
break;
}
case ASM_INT16X8: {
return ValueBuilder::makeCall(SIMD_INT16X8, ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0));
break;
}
case ASM_INT32X4: {
return ValueBuilder::makeCall(SIMD_INT32X4, ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0), ValueBuilder::makeNum(0));
break;
}
default: assert(0);
}
abort();
}
Ref makeAsmCoercion(Ref node, AsmType type) {
switch (type) {
case ASM_INT: return ValueBuilder::makeBinary(node, OR, ValueBuilder::makeNum(0));
case ASM_DOUBLE: return ValueBuilder::makeUnary(PLUS, node);
case ASM_FLOAT: return ValueBuilder::makeCall(MATH_FROUND, node);
case ASM_FLOAT32X4: return ValueBuilder::makeCall(SIMD_FLOAT32X4_CHECK, node);
case ASM_FLOAT64X2: return ValueBuilder::makeCall(SIMD_FLOAT64X2_CHECK, node);
case ASM_INT8X16: return ValueBuilder::makeCall(SIMD_INT8X16_CHECK, node);
case ASM_INT16X8: return ValueBuilder::makeCall(SIMD_INT16X8_CHECK, node);
case ASM_INT32X4: return ValueBuilder::makeCall(SIMD_INT32X4_CHECK, node);
case ASM_NONE:
default: return node; // non-validating code, emit nothing XXX this is dangerous, we should only allow this when we know we are not validating
}
}
Ref makeSigning(Ref node, AsmSign sign) {
assert(sign == ASM_SIGNED || sign == ASM_UNSIGNED);
return ValueBuilder::makeBinary(node, sign == ASM_SIGNED ? OR : TRSHIFT, ValueBuilder::makeNum(0));
}
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