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v8/test/unittests/wasm/encoder-unittest.cc
binji 78f6f838f0 [Wasm] Convert many of the fixed-size values to LEB128. 
This CL modifies the following to be LEB128:
* Function table indices
* Import table signature indices
* Export table function indices
* Function signature param count
* br/br_if break depth
* br_table target count
* block/loop expression count

Still to do:
* Import/export names (LEB128 count + inline data)
* Data segments (LEB128 offset + size + inline data)
* Function header stuff (should seperate into function sig and body sections)
* Memory access alignment + offset (still discussing)

BUG=
R=titzer@chromium.org

Review URL: https://codereview.chromium.org/1775873002

Cr-Commit-Position: refs/heads/master@{#34603}
2016-03-08 22:56:18 +00:00

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7.3 KiB
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// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "test/unittests/test-utils.h"
#include "src/v8.h"
#include "src/wasm/ast-decoder.h"
#include "src/wasm/encoder.h"
namespace v8 {
namespace internal {
namespace wasm {
class EncoderTest : public TestWithZone {
protected:
void AddLocal(WasmFunctionBuilder* f, LocalType type) {
uint16_t index = f->AddLocal(type);
const std::vector<uint8_t>& out_index = UnsignedLEB128From(index);
std::vector<uint8_t> code;
code.push_back(kExprGetLocal);
for (size_t i = 0; i < out_index.size(); i++) {
code.push_back(out_index.at(i));
}
uint32_t local_indices[] = {1};
f->EmitCode(&code[0], static_cast<uint32_t>(code.size()), local_indices, 1);
}
void CheckReadValue(uint8_t* leb_value, uint32_t expected_result,
int expected_length,
ReadUnsignedLEB128ErrorCode expected_error_code) {
int length;
uint32_t result;
ReadUnsignedLEB128ErrorCode error_code =
ReadUnsignedLEB128Operand(leb_value, leb_value + 5, &length, &result);
CHECK_EQ(error_code, expected_error_code);
if (error_code == 0) {
CHECK_EQ(result, expected_result);
CHECK_EQ(length, expected_length);
}
}
void CheckWriteValue(uint32_t input, int length, uint8_t* vals) {
const std::vector<uint8_t> result = UnsignedLEB128From(input);
CHECK_EQ(result.size(), length);
for (int i = 0; i < length; i++) {
CHECK_EQ(result.at(i), vals[i]);
}
}
};
TEST_F(EncoderTest, Function_Builder_Variable_Indexing) {
Zone zone;
WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
uint16_t f_index = builder->AddFunction();
WasmFunctionBuilder* function = builder->FunctionAt(f_index);
uint16_t local_f32 = function->AddLocal(kAstF32);
uint16_t param_float32 = function->AddParam(kAstF32);
uint16_t local_i32 = function->AddLocal(kAstI32);
uint16_t local_f64 = function->AddLocal(kAstF64);
uint16_t local_i64 = function->AddLocal(kAstI64);
uint16_t param_int32 = function->AddParam(kAstI32);
uint16_t local_i32_2 = function->AddLocal(kAstI32);
byte code[] = {kExprGetLocal, static_cast<uint8_t>(param_float32)};
uint32_t local_indices[] = {1};
function->EmitCode(code, sizeof(code), local_indices, 1);
code[1] = static_cast<uint8_t>(param_int32);
function->EmitCode(code, sizeof(code), local_indices, 1);
code[1] = static_cast<uint8_t>(local_i32);
function->EmitCode(code, sizeof(code), local_indices, 1);
code[1] = static_cast<uint8_t>(local_i32_2);
function->EmitCode(code, sizeof(code), local_indices, 1);
code[1] = static_cast<uint8_t>(local_i64);
function->EmitCode(code, sizeof(code), local_indices, 1);
code[1] = static_cast<uint8_t>(local_f32);
function->EmitCode(code, sizeof(code), local_indices, 1);
code[1] = static_cast<uint8_t>(local_f64);
function->EmitCode(code, sizeof(code), local_indices, 1);
WasmFunctionEncoder* f = function->Build(&zone, builder);
ZoneVector<uint8_t> buffer_vector(f->HeaderSize() + f->BodySize(), &zone);
byte* buffer = &buffer_vector[0];
byte* header = buffer;
byte* body = buffer + f->HeaderSize();
f->Serialize(buffer, &header, &body);
}
TEST_F(EncoderTest, Function_Builder_Indexing_Variable_Width) {
Zone zone;
WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
uint16_t f_index = builder->AddFunction();
WasmFunctionBuilder* function = builder->FunctionAt(f_index);
for (size_t i = 0; i < 128; i++) {
AddLocal(function, kAstF32);
}
AddLocal(function, kAstI32);
WasmFunctionEncoder* f = function->Build(&zone, builder);
ZoneVector<uint8_t> buffer_vector(f->HeaderSize() + f->BodySize(), &zone);
byte* buffer = &buffer_vector[0];
byte* header = buffer;
byte* body = buffer + f->HeaderSize();
f->Serialize(buffer, &header, &body);
body = buffer + f->HeaderSize();
}
TEST_F(EncoderTest, Function_Builder_Block_Variable_Width) {
Zone zone;
WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
uint16_t f_index = builder->AddFunction();
WasmFunctionBuilder* function = builder->FunctionAt(f_index);
function->EmitWithVarInt(kExprBlock, 200);
for (int i = 0; i < 200; ++i) {
function->Emit(kExprNop);
}
WasmFunctionEncoder* f = function->Build(&zone, builder);
CHECK_EQ(f->BodySize(), 204);
}
TEST_F(EncoderTest, Function_Builder_EmitEditableVarIntImmediate) {
Zone zone;
WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
uint16_t f_index = builder->AddFunction();
WasmFunctionBuilder* function = builder->FunctionAt(f_index);
function->Emit(kExprLoop);
uint32_t offset = function->EmitEditableVarIntImmediate();
for (int i = 0; i < 200; ++i) {
function->Emit(kExprNop);
}
function->EditVarIntImmediate(offset, 200);
WasmFunctionEncoder* f = function->Build(&zone, builder);
CHECK_EQ(f->BodySize(), 204);
}
TEST_F(EncoderTest, Function_Builder_EmitEditableVarIntImmediate_Locals) {
Zone zone;
WasmModuleBuilder* builder = new (&zone) WasmModuleBuilder(&zone);
uint16_t f_index = builder->AddFunction();
WasmFunctionBuilder* function = builder->FunctionAt(f_index);
function->Emit(kExprBlock);
uint32_t offset = function->EmitEditableVarIntImmediate();
for (int i = 0; i < 200; ++i) {
AddLocal(function, kAstI32);
}
function->EditVarIntImmediate(offset, 200);
WasmFunctionEncoder* f = function->Build(&zone, builder);
ZoneVector<uint8_t> buffer_vector(f->HeaderSize() + f->BodySize(), &zone);
byte* buffer = &buffer_vector[0];
byte* header = buffer;
byte* body = buffer + f->HeaderSize();
f->Serialize(buffer, &header, &body);
body = buffer + f->HeaderSize();
CHECK_EQ(f->BodySize(), 479);
const uint8_t varint200_low = (200 & 0x7f) | 0x80;
const uint8_t varint200_high = (200 >> 7) & 0x7f;
offset = 0;
CHECK_EQ(body[offset++], 1); // Local decl count.
CHECK_EQ(body[offset++], varint200_low);
CHECK_EQ(body[offset++], varint200_high);
CHECK_EQ(body[offset++], kLocalI32);
CHECK_EQ(body[offset++], kExprBlock);
CHECK_EQ(body[offset++], varint200_low);
CHECK_EQ(body[offset++], varint200_high);
// GetLocal with one-byte indices.
for (int i = 0; i <= 127; ++i) {
CHECK_EQ(body[offset++], kExprGetLocal);
CHECK_EQ(body[offset++], i);
}
// GetLocal with two-byte indices.
for (int i = 128; i < 200; ++i) {
CHECK_EQ(body[offset++], kExprGetLocal);
CHECK_EQ(body[offset++], (i & 0x7f) | 0x80);
CHECK_EQ(body[offset++], (i >> 7) & 0x7f);
}
CHECK_EQ(offset, 479);
}
TEST_F(EncoderTest, LEB_Functions) {
byte leb_value[5] = {0, 0, 0, 0, 0};
CheckReadValue(leb_value, 0, 1, kNoError);
CheckWriteValue(0, 1, leb_value);
leb_value[0] = 23;
CheckReadValue(leb_value, 23, 1, kNoError);
CheckWriteValue(23, 1, leb_value);
leb_value[0] = 0x80;
leb_value[1] = 0x01;
CheckReadValue(leb_value, 128, 2, kNoError);
CheckWriteValue(128, 2, leb_value);
leb_value[0] = 0x80;
leb_value[1] = 0x80;
leb_value[2] = 0x80;
leb_value[3] = 0x80;
leb_value[4] = 0x01;
CheckReadValue(leb_value, 0x10000000, 5, kNoError);
CheckWriteValue(0x10000000, 5, leb_value);
leb_value[0] = 0x80;
leb_value[1] = 0x80;
leb_value[2] = 0x80;
leb_value[3] = 0x80;
leb_value[4] = 0x80;
CheckReadValue(leb_value, -1, -1, kInvalidLEB128);
}
} // namespace wasm
} // namespace internal
} // namespace v8
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