1b7f99a0cb
There are some accesses that we know that are pointers, and we can specialize them to have Pointer as their Machine Type and Write Barrier. Drive-by fix: ForJSGeneratorObjectParametersAndRegisters can be changed to use Pointer. Bug: v8:7703 Change-Id: I88e371746fc5f08c84795c95b1885264ef6c067c Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1741658 Commit-Queue: Santiago Aboy Solanes <solanes@chromium.org> Reviewed-by: Georg Neis <neis@chromium.org> Cr-Commit-Position: refs/heads/master@{#63223}
158 lines
7.2 KiB
C++
158 lines
7.2 KiB
C++
// Copyright 2019 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// The C++ style guide recommends using <re2> instead of <regex>. However, the
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// former isn't available in V8.
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#include <regex> // NOLINT(build/c++11)
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#include <vector>
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#include "src/codegen/arm64/register-arm64.h"
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#include "test/cctest/cctest.h"
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#include "test/cctest/disasm-regex-helper.h"
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namespace v8 {
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namespace internal {
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namespace {
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// Poison register.
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const int kPRegCode = kSpeculationPoisonRegister.code();
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const std::string kPReg = // NOLINT(runtime/string)
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"x" + std::to_string(kPRegCode);
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} // namespace
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TEST(DisasmPoisonMonomorphicLoad) {
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#ifdef ENABLE_DISASSEMBLER
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if (i::FLAG_always_opt || !i::FLAG_opt) return;
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i::FLAG_allow_natives_syntax = true;
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i::FLAG_untrusted_code_mitigations = true;
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CcTest::InitializeVM();
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v8::HandleScope scope(CcTest::isolate());
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CompileRun(
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"function mono(o) { return o.x; };"
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"%PrepareFunctionForOptimization(mono);"
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"mono({ x : 1 });"
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"mono({ x : 1 });"
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"%OptimizeFunctionOnNextCall(mono);"
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"mono({ x : 1 });");
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// Matches that the property access sequence is instrumented with
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// poisoning.
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#if defined(V8_COMPRESS_POINTERS)
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std::vector<std::string> patterns_array = {
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"ldur <<Map:w[0-9]+>>, \\[<<Obj:x[0-9]+>>, #-1\\]", // load map
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"ldr <<ExpMap:w[0-9]+>>, pc", // load expected map
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"cmp <<Map>>, <<ExpMap>>", // compare maps
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"b.ne", // deopt if different
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"csel " + kPReg + ", xzr, " + kPReg + ", ne", // update the poison
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"csdb", // spec. barrier
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"ldursw x<<Field:[0-9]+>>, \\[<<Obj>>, #[0-9]+\\]", // load the field
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"and x<<Field>>, x<<Field>>, " + kPReg, // apply the poison
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};
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#else
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std::vector<std::string> patterns_array = {
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"ldur <<Map:x[0-9]+>>, \\[<<Obj:x[0-9]+>>, #-1\\]", // load map
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"ldr <<ExpMap:x[0-9]+>>, pc", // load expected map
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"cmp <<Map>>, <<ExpMap>>", // compare maps
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"b.ne", // deopt if different
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"csel " + kPReg + ", xzr, " + kPReg + ", ne", // update the poison
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"csdb", // spec. barrier
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"ldur <<Field:x[0-9]+>>, \\[<<Obj>>, #[0-9]+\\]", // load the field
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"and <<Field>>, <<Field>>, " + kPReg, // apply the poison
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};
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#endif
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CHECK(CheckDisassemblyRegexPatterns("mono", patterns_array));
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#endif // ENABLE_DISASSEMBLER
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}
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TEST(DisasmPoisonPolymorphicLoad) {
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#ifdef ENABLE_DISASSEMBLER
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if (i::FLAG_always_opt || !i::FLAG_opt) return;
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i::FLAG_allow_natives_syntax = true;
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i::FLAG_untrusted_code_mitigations = true;
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CcTest::InitializeVM();
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v8::HandleScope scope(CcTest::isolate());
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CompileRun(
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"function poly(o) { return o.x + 1; };"
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"let o1 = { x : 1 };"
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"let o2 = { y : 1 };"
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"o2.x = 2;"
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"%PrepareFunctionForOptimization(poly);"
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"poly(o2);"
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"poly(o1);"
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"poly(o2);"
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"%OptimizeFunctionOnNextCall(poly);"
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"poly(o1);");
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// Matches that the property access sequence is instrumented with
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// poisoning.
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#if defined(V8_COMPRESS_POINTERS)
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std::vector<std::string> patterns_array = {
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"ldur <<Map0:w[0-9]+>>, \\[<<Obj:x[0-9]+>>, #-1\\]", // load map
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"ldr <<ExpMap:w[0-9]+>>, pc", // load map const #1
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"cmp <<Map0>>, <<ExpMap>>", // compare maps
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"b.eq", // ? go to the load
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"csel " + kPReg + ", xzr, " + kPReg + ", eq", // update the poison
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"csdb", // spec. barrier
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"ldur <<Map1:w[0-9]+>>, \\[<<Obj>>, #-1\\]", // load map
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"ldr <<ExpMap1:w[0-9]+>>, pc", // load map const #2
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"cmp <<Map1>>, <<ExpMap1>>", // compare maps
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"b.ne", // deopt if different
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"csel " + kPReg + ", xzr, " + kPReg + ", ne", // update the poison
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"csdb", // spec. barrier
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"ldur w<<Field:[0-9]+>>, \\[<<Obj>>, #[0-9]+\\]", // load the field
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"and x<<Field>>, x<<Field>>, " + kPReg, // apply the poison
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"asr w[0-9]+, w<<Field>>, #1", // untag
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"b", // goto merge point
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// Lcase1:
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"csel " + kPReg + ", xzr, " + kPReg + ", ne", // update the poison
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"csdb", // spec. barrier
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"ldursw x<<BSt:[0-9]+>>, \\[<<Obj>>, #[0-9]+\\]", // load backing store
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// branchful decompress
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"add x<<BSt>>, x26, x<<BSt>>", // Add root to ref
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"and x<<BSt>>, x<<BSt>>, " + kPReg, // apply the poison
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"ldur w<<Prop:[0-9]+>>, \\[x<<BSt>>, #[0-9]+\\]", // load the property
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"and x<<Prop>>, x<<Prop>>, " + kPReg, // apply the poison
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// Ldone:
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};
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#else
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std::vector<std::string> patterns_array = {
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"ldur <<Map0:x[0-9]+>>, \\[<<Obj:x[0-9]+>>, #-1\\]", // load map
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"ldr <<ExpMap0:x[0-9]+>>, pc", // load map const #1
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"cmp <<Map0>>, <<ExpMap0>>", // compare maps
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"b.eq", // ? go to the load
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"csel " + kPReg + ", xzr, " + kPReg + ", eq", // update the poison
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"csdb", // spec. barrier
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"ldur <<Map1:x[0-9]+>>, \\[<<Obj>>, #-1\\]", // load map
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"ldr <<ExpMap1:x[0-9]+>>, pc", // load map const #2
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"cmp <<Map1>>, <<ExpMap1>>", // compare maps
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"b.ne", // deopt if different
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"csel " + kPReg + ", xzr, " + kPReg + ", ne", // update the poison
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"csdb", // spec. barrier
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"ldur <<Field:x[0-9]+>>, \\[<<Obj>>, #[0-9]+\\]", // load the field
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"and <<Field>>, <<Field>>, " + kPReg, // apply the poison
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"asr x[0-9]+, <<Field>>, #32", // untag
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"b", // goto merge point
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// Lcase1:
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"csel " + kPReg + ", xzr, " + kPReg + ", ne", // update the poison
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"csdb", // spec. barrier
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"ldur <<BSt:x[0-9]+>>, \\[<<Obj>>, #[0-9]+\\]", // load backing store
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"and <<BSt>>, <<BSt>>, " + kPReg, // apply the poison
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"ldur <<Prop:x[0-9]+>>, \\[<<BSt>>, #[0-9]+\\]", // load the property
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"and <<Prop>>, <<Prop>>, " + kPReg, // apply the poison
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// Ldone:
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};
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#endif
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CHECK(CheckDisassemblyRegexPatterns("poly", patterns_array));
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#endif // ENABLE_DISASSEMBLER
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}
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} // namespace internal
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} // namespace v8
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