7d8a3028dd
From asm.js code we might get an empty ArrayBuffer as heap memory. In this case, both the old memory start and the new memory start will be nullptr. The size however has to be patched from default_size to 0. This CL changes code specialization to be able to either patch memory references, or patch memory sizes or both. R=titzer@chromium.org, ahaas@chromium.org BUG=chromium:698587 Change-Id: I4d9d811d75cb83842f23df317e8e7fc02aeb5146 Reviewed-on: https://chromium-review.googlesource.com/450257 Commit-Queue: Clemens Hammacher <clemensh@chromium.org> Reviewed-by: Andreas Haas <ahaas@chromium.org> Cr-Commit-Position: refs/heads/master@{#43613}
137 lines
4.0 KiB
C++
137 lines
4.0 KiB
C++
// Copyright 2015 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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#include <stdlib.h>
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#include "src/v8.h"
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#include "src/debug/debug.h"
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#include "src/disasm.h"
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#include "src/disassembler.h"
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#include "src/ic/ic.h"
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#include "src/macro-assembler.h"
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#include "src/objects-inl.h"
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#include "src/ostreams.h"
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#include "test/cctest/cctest.h"
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#include "test/cctest/compiler/c-signature.h"
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#include "test/cctest/compiler/call-tester.h"
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using namespace v8::internal;
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using namespace v8::internal::compiler;
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#define __ assm.
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static int32_t DummyStaticFunction(Object* result) { return 1; }
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TEST(WasmRelocationX64MemoryReference) {
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Isolate* isolate = CcTest::i_isolate();
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HandleScope scope(isolate);
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v8::internal::byte buffer[4096];
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Assembler assm(isolate, buffer, sizeof buffer);
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DummyStaticFunction(NULL);
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int64_t imm = 1234567;
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__ movq(rax, imm, RelocInfo::WASM_MEMORY_REFERENCE);
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__ nop();
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__ ret(0);
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CodeDesc desc;
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assm.GetCode(&desc);
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Handle<Code> code = isolate->factory()->NewCode(
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desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
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USE(code);
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CSignature0<int64_t> csig;
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CodeRunner<int64_t> runnable(isolate, code, &csig);
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int64_t ret_value = runnable.Call();
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CHECK_EQ(ret_value, imm);
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#ifdef OBJECT_PRINT
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OFStream os(stdout);
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code->Print(os);
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byte* begin = code->instruction_start();
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byte* end = begin + code->instruction_size();
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disasm::Disassembler::Disassemble(stdout, begin, end);
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#endif
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int offset = 1234;
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// Relocating references by offset
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int mode_mask = (1 << RelocInfo::WASM_MEMORY_REFERENCE);
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for (RelocIterator it(*code, mode_mask); !it.done(); it.next()) {
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DCHECK(RelocInfo::IsWasmMemoryReference(it.rinfo()->rmode()));
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it.rinfo()->update_wasm_memory_reference(
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it.rinfo()->wasm_memory_reference(),
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it.rinfo()->wasm_memory_reference() + offset, SKIP_ICACHE_FLUSH);
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}
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// Check if immediate is updated correctly
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ret_value = runnable.Call();
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CHECK_EQ(ret_value, imm + offset);
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#ifdef OBJECT_PRINT
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code->Print(os);
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begin = code->instruction_start();
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end = begin + code->instruction_size();
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disasm::Disassembler::Disassemble(stdout, begin, end);
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#endif
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}
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TEST(WasmRelocationX64WasmMemorySizeReference) {
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CcTest::InitializeVM();
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Isolate* isolate = CcTest::i_isolate();
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HandleScope scope(isolate);
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v8::internal::byte buffer[4096];
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Assembler assm(isolate, buffer, sizeof buffer);
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DummyStaticFunction(NULL);
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int32_t size = 512;
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Label fail;
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__ movl(rax, Immediate(size, RelocInfo::WASM_MEMORY_SIZE_REFERENCE));
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__ cmpl(rax, Immediate(size, RelocInfo::WASM_MEMORY_SIZE_REFERENCE));
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__ j(not_equal, &fail);
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__ ret(0);
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__ bind(&fail);
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__ movl(rax, Immediate(0xdeadbeef));
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__ ret(0);
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CodeDesc desc;
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assm.GetCode(&desc);
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Handle<Code> code = isolate->factory()->NewCode(
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desc, Code::ComputeFlags(Code::STUB), Handle<Code>());
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USE(code);
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CSignature0<int64_t> csig;
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CodeRunner<int64_t> runnable(isolate, code, &csig);
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int64_t ret_value = runnable.Call();
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CHECK_NE(ret_value, bit_cast<uint32_t>(0xdeadbeef));
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#ifdef OBJECT_PRINT
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OFStream os(stdout);
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code->Print(os);
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byte* begin = code->instruction_start();
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byte* end = begin + code->instruction_size();
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disasm::Disassembler::Disassemble(stdout, begin, end);
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#endif
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int32_t diff = 512;
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int mode_mask = (1 << RelocInfo::WASM_MEMORY_SIZE_REFERENCE);
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for (RelocIterator it(*code, mode_mask); !it.done(); it.next()) {
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DCHECK(RelocInfo::IsWasmMemorySizeReference(it.rinfo()->rmode()));
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it.rinfo()->update_wasm_memory_size(
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it.rinfo()->wasm_memory_size_reference(),
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it.rinfo()->wasm_memory_size_reference() + diff, SKIP_ICACHE_FLUSH);
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}
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ret_value = runnable.Call();
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CHECK_NE(ret_value, bit_cast<uint32_t>(0xdeadbeef));
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#ifdef OBJECT_PRINT
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code->Print(os);
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begin = code->instruction_start();
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end = begin + code->instruction_size();
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disasm::Disassembler::Disassemble(stdout, begin, end);
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#endif
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}
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#undef __
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