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chromium / v8 / v8 / 890d28f3615769c3aa82b1bdf7df12c55774f909 / . / src / asmjs / asm-wasm-builder.cc
blob: f928ae1b97e4bcdbe9e9785f16a181d0a281e50f [file] [log] [blame]
// 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 "src/v8.h"
// Required to get M_E etc. in MSVC.
#if defined(_WIN32)
#define _USE_MATH_DEFINES
#endif
#include <math.h>
#include "src/asmjs/asm-types.h"
#include "src/asmjs/asm-wasm-builder.h"
#include "src/asmjs/switch-logic.h"
#include "src/wasm/wasm-macro-gen.h"
#include "src/wasm/wasm-opcodes.h"
#include "src/ast/ast.h"
#include "src/ast/scopes.h"
#include "src/codegen.h"
#include "src/compiler.h"
#include "src/isolate.h"
#include "src/parsing/parse-info.h"
namespace v8 {
namespace internal {
namespace wasm {
#define RECURSE(call) \
do { \
DCHECK(!HasStackOverflow()); \
call; \
if (HasStackOverflow()) return; \
} while (false)
enum AsmScope { kModuleScope, kInitScope, kFuncScope, kExportScope };
enum ValueFate { kDrop, kLeaveOnStack };
struct ForeignVariable {
Handle<Name> name;
Variable* var;
LocalType type;
};
class AsmWasmBuilderImpl final : public AstVisitor<AsmWasmBuilderImpl> {
public:
AsmWasmBuilderImpl(Isolate* isolate, Zone* zone,
AstValueFactory* ast_value_factory, Handle<Script> script,
FunctionLiteral* literal, AsmTyper* typer)
: local_variables_(ZoneHashMap::kDefaultHashMapCapacity,
ZoneAllocationPolicy(zone)),
functions_(ZoneHashMap::kDefaultHashMapCapacity,
ZoneAllocationPolicy(zone)),
global_variables_(ZoneHashMap::kDefaultHashMapCapacity,
ZoneAllocationPolicy(zone)),
scope_(kModuleScope),
builder_(new (zone) WasmModuleBuilder(zone)),
current_function_builder_(nullptr),
literal_(literal),
isolate_(isolate),
zone_(zone),
ast_value_factory_(ast_value_factory),
script_(script),
typer_(typer),
typer_failed_(false),
breakable_blocks_(zone),
foreign_variables_(zone),
init_function_(nullptr),
foreign_init_function_(nullptr),
function_tables_(ZoneHashMap::kDefaultHashMapCapacity,
ZoneAllocationPolicy(zone)),
imported_function_table_(this),
parent_binop_(nullptr) {
InitializeAstVisitor(isolate);
}
void InitializeInitFunction() {
FunctionSig::Builder b(zone(), 0, 0);
init_function_ = builder_->AddFunction(b.Build());
builder_->MarkStartFunction(init_function_);
}
void BuildForeignInitFunction() {
foreign_init_function_ = builder_->AddFunction();
FunctionSig::Builder b(zone(), 0, foreign_variables_.size());
for (auto i = foreign_variables_.begin(); i != foreign_variables_.end();
++i) {
b.AddParam(i->type);
}
foreign_init_function_->ExportAs(
CStrVector(AsmWasmBuilder::foreign_init_name));
foreign_init_function_->SetSignature(b.Build());
for (size_t pos = 0; pos < foreign_variables_.size(); ++pos) {
foreign_init_function_->EmitGetLocal(static_cast<uint32_t>(pos));
ForeignVariable* fv = &foreign_variables_[pos];
uint32_t index = LookupOrInsertGlobal(fv->var, fv->type);
foreign_init_function_->EmitWithVarInt(kExprSetGlobal, index);
}
}
Handle<FixedArray> GetForeignArgs() {
Handle<FixedArray> ret = isolate_->factory()->NewFixedArray(
static_cast<int>(foreign_variables_.size()));
for (size_t i = 0; i < foreign_variables_.size(); ++i) {
ForeignVariable* fv = &foreign_variables_[i];
ret->set(static_cast<int>(i), *fv->name);
}
return ret;
}
bool Build() {
InitializeInitFunction();
if (!typer_->ValidateBeforeFunctionsPhase()) {
return false;
}
DCHECK(!HasStackOverflow());
VisitFunctionLiteral(literal_);
if (HasStackOverflow()) {
return false;
}
if (typer_failed_) {
return false;
}
BuildForeignInitFunction();
return true;
}
void VisitVariableDeclaration(VariableDeclaration* decl) {}
void VisitFunctionDeclaration(FunctionDeclaration* decl) {
DCHECK_EQ(kModuleScope, scope_);
DCHECK_NULL(current_function_builder_);
FunctionLiteral* old_func = decl->fun();
Zone zone(isolate_->allocator(), ZONE_NAME);
DeclarationScope* new_func_scope = nullptr;
if (decl->fun()->body() == nullptr) {
// TODO(bradnelson): Refactor parser so we don't need a
// SharedFunctionInfo to parse a single function,
// or squirrel away the SharedFunctionInfo to use later.
Handle<SharedFunctionInfo> shared =
isolate_->factory()->NewSharedFunctionInfoForLiteral(decl->fun(),
script_);
shared->set_is_toplevel(false);
ParseInfo info(&zone, script_);
info.set_shared_info(shared);
info.set_toplevel(false);
info.set_language_mode(decl->fun()->scope()->language_mode());
info.set_allow_lazy_parsing(false);
info.set_function_literal_id(shared->function_literal_id());
info.set_ast_value_factory(ast_value_factory_);
info.set_ast_value_factory_owned(false);
// Create fresh function scope to use to parse the function in.
new_func_scope = new (info.zone()) DeclarationScope(
info.zone(), decl->fun()->scope()->outer_scope(), FUNCTION_SCOPE);
info.set_asm_function_scope(new_func_scope);
if (!Compiler::ParseAndAnalyze(&info)) {
typer_failed_ = true;
return;
}
FunctionLiteral* func = info.literal();
DCHECK_NOT_NULL(func);
decl->set_fun(func);
}
if (!typer_->ValidateInnerFunction(decl)) {
typer_failed_ = true;
decl->set_fun(old_func);
if (new_func_scope != nullptr) {
DCHECK_EQ(new_func_scope, decl->scope()->inner_scope());
if (!decl->scope()->RemoveInnerScope(new_func_scope)) {
UNREACHABLE();
}
}
return;
}
current_function_builder_ = LookupOrInsertFunction(decl->proxy()->var());
scope_ = kFuncScope;
RECURSE(Visit(decl->fun()));
decl->set_fun(old_func);
if (new_func_scope != nullptr) {
DCHECK_EQ(new_func_scope, decl->scope()->inner_scope());
if (!decl->scope()->RemoveInnerScope(new_func_scope)) {
UNREACHABLE();
}
}
scope_ = kModuleScope;
current_function_builder_ = nullptr;
local_variables_.Clear();
typer_->ClearFunctionNodeTypes();
}
void VisitStatements(ZoneList<Statement*>* stmts) {
for (int i = 0; i < stmts->length(); ++i) {
Statement* stmt = stmts->at(i);
ExpressionStatement* e = stmt->AsExpressionStatement();
if (e != nullptr && e->expression()->IsUndefinedLiteral()) {
continue;
}
RECURSE(Visit(stmt));
if (typer_failed_) break;
if (stmt->IsJump()) break;
}
}
void VisitBlock(Block* stmt) {
if (stmt->statements()->length() == 1) {
ExpressionStatement* expr =
stmt->statements()->at(0)->AsExpressionStatement();
if (expr != nullptr) {
if (expr->expression()->IsAssignment()) {
RECURSE(VisitExpressionStatement(expr));
return;
}
}
}
if (scope_ == kFuncScope) {
BlockVisitor visitor(this, stmt->AsBreakableStatement(), kExprBlock);
RECURSE(VisitStatements(stmt->statements()));
} else {
RECURSE(VisitStatements(stmt->statements()));
}
}
class BlockVisitor {
private:
AsmWasmBuilderImpl* builder_;
public:
BlockVisitor(AsmWasmBuilderImpl* builder, BreakableStatement* stmt,
WasmOpcode opcode)
: builder_(builder) {
builder_->breakable_blocks_.push_back(
std::make_pair(stmt, opcode == kExprLoop));
// block and loops have a type immediate.
builder_->current_function_builder_->EmitWithU8(opcode, kLocalVoid);
}
~BlockVisitor() {
builder_->current_function_builder_->Emit(kExprEnd);
builder_->breakable_blocks_.pop_back();
}
};
void VisitExpressionStatement(ExpressionStatement* stmt) {
VisitForEffect(stmt->expression());
}
void VisitForEffect(Expression* expr) {
if (expr->IsAssignment()) {
// Don't emit drops for assignments. Instead use SetLocal/GetLocal.
VisitAssignment(expr->AsAssignment(), kDrop);
return;
}
if (expr->IsCall()) {
// Only emit a drop if the call has a non-void return value.
if (VisitCallExpression(expr->AsCall()) && scope_ == kFuncScope) {
current_function_builder_->Emit(kExprDrop);
}
return;
}
if (expr->IsBinaryOperation()) {
BinaryOperation* binop = expr->AsBinaryOperation();
if (binop->op() == Token::COMMA) {
VisitForEffect(binop->left());
VisitForEffect(binop->right());
return;
}
}
RECURSE(Visit(expr));
if (scope_ == kFuncScope) current_function_builder_->Emit(kExprDrop);
}
void VisitEmptyStatement(EmptyStatement* stmt) {}
void VisitEmptyParentheses(EmptyParentheses* paren) { UNREACHABLE(); }
void VisitGetIterator(GetIterator* expr) { UNREACHABLE(); }
void VisitIfStatement(IfStatement* stmt) {
DCHECK_EQ(kFuncScope, scope_);
RECURSE(Visit(stmt->condition()));
current_function_builder_->EmitWithU8(kExprIf, kLocalVoid);
// WASM ifs come with implement blocks for both arms.
breakable_blocks_.push_back(std::make_pair(nullptr, false));
if (stmt->HasThenStatement()) {
RECURSE(Visit(stmt->then_statement()));
}
if (stmt->HasElseStatement()) {
current_function_builder_->Emit(kExprElse);
RECURSE(Visit(stmt->else_statement()));
}
current_function_builder_->Emit(kExprEnd);
breakable_blocks_.pop_back();
}
void DoBreakOrContinue(BreakableStatement* target, bool is_continue) {
DCHECK_EQ(kFuncScope, scope_);
for (int i = static_cast<int>(breakable_blocks_.size()) - 1; i >= 0; --i) {
auto elem = breakable_blocks_.at(i);
if (elem.first == target && elem.second == is_continue) {
int block_distance = static_cast<int>(breakable_blocks_.size() - i - 1);
current_function_builder_->Emit(kExprBr);
current_function_builder_->EmitVarInt(block_distance);
return;
}
}
UNREACHABLE(); // statement not found
}
void VisitContinueStatement(ContinueStatement* stmt) {
DoBreakOrContinue(stmt->target(), true);
}
void VisitBreakStatement(BreakStatement* stmt) {
DoBreakOrContinue(stmt->target(), false);
}
void VisitReturnStatement(ReturnStatement* stmt) {
if (scope_ == kModuleScope) {
if (!typer_->ValidateAfterFunctionsPhase()) {
typer_failed_ = true;
return;
}
scope_ = kExportScope;
RECURSE(Visit(stmt->expression()));
scope_ = kModuleScope;
} else if (scope_ == kFuncScope) {
RECURSE(Visit(stmt->expression()));
current_function_builder_->Emit(kExprReturn);
} else {
UNREACHABLE();
}
}
void VisitWithStatement(WithStatement* stmt) { UNREACHABLE(); }
void HandleCase(CaseNode* node,
ZoneMap<int, unsigned int>& case_to_block,
VariableProxy* tag, int default_block, int if_depth) {
int prev_if_depth = if_depth;
if (node->left != nullptr) {
VisitVariableProxy(tag);
current_function_builder_->EmitI32Const(node->begin);
current_function_builder_->Emit(kExprI32LtS);
current_function_builder_->EmitWithU8(kExprIf, kLocalVoid);
if_depth++;
breakable_blocks_.push_back(std::make_pair(nullptr, false));
HandleCase(node->left, case_to_block, tag, default_block, if_depth);
current_function_builder_->Emit(kExprElse);
}
if (node->right != nullptr) {
VisitVariableProxy(tag);
current_function_builder_->EmitI32Const(node->end);
current_function_builder_->Emit(kExprI32GtS);
current_function_builder_->EmitWithU8(kExprIf, kLocalVoid);
if_depth++;
breakable_blocks_.push_back(std::make_pair(nullptr, false));
HandleCase(node->right, case_to_block, tag, default_block, if_depth);
current_function_builder_->Emit(kExprElse);
}
if (node->begin == node->end) {
VisitVariableProxy(tag);
current_function_builder_->EmitI32Const(node->begin);
current_function_builder_->Emit(kExprI32Eq);
current_function_builder_->EmitWithU8(kExprIf, kLocalVoid);
DCHECK(case_to_block.find(node->begin) != case_to_block.end());
current_function_builder_->Emit(kExprBr);
current_function_builder_->EmitVarInt(1 + if_depth +
case_to_block[node->begin]);
current_function_builder_->Emit(kExprEnd);
} else {
if (node->begin != 0) {
VisitVariableProxy(tag);
current_function_builder_->EmitI32Const(node->begin);
current_function_builder_->Emit(kExprI32Sub);
} else {
VisitVariableProxy(tag);
}
current_function_builder_->Emit(kExprBrTable);
current_function_builder_->EmitVarInt(node->end - node->begin + 1);
for (int v = node->begin; v <= node->end; ++v) {
if (case_to_block.find(v) != case_to_block.end()) {
uint32_t target = if_depth + case_to_block[v];
current_function_builder_->EmitVarInt(target);
} else {
uint32_t target = if_depth + default_block;
current_function_builder_->EmitVarInt(target);
}
if (v == kMaxInt) {
break;
}
}
uint32_t target = if_depth + default_block;
current_function_builder_->EmitVarInt(target);
}
while (if_depth-- != prev_if_depth) {
breakable_blocks_.pop_back();
current_function_builder_->Emit(kExprEnd);
}
}
void VisitSwitchStatement(SwitchStatement* stmt) {
VariableProxy* tag = stmt->tag()->AsVariableProxy();
DCHECK_NOT_NULL(tag);
ZoneList<CaseClause*>* clauses = stmt->cases();
int case_count = clauses->length();
if (case_count == 0) {
return;
}
BlockVisitor visitor(this, stmt->AsBreakableStatement(), kExprBlock);
ZoneVector<BlockVisitor*> blocks(zone_);
ZoneVector<int32_t> cases(zone_);
ZoneMap<int, unsigned int> case_to_block(zone_);
bool has_default = false;
for (int i = case_count - 1; i >= 0; --i) {
CaseClause* clause = clauses->at(i);
blocks.push_back(new BlockVisitor(this, nullptr, kExprBlock));
if (!clause->is_default()) {
Literal* label = clause->label()->AsLiteral();
Handle<Object> value = label->value();
int32_t label_value;
bool label_is_i32 = value->ToInt32(&label_value);
DCHECK(value->IsNumber() && label_is_i32);
(void)label_is_i32;
case_to_block[label_value] = i;
cases.push_back(label_value);
} else {
DCHECK_EQ(i, case_count - 1);
has_default = true;
}
}
if (!has_default || case_count > 1) {
int default_block = has_default ? case_count - 1 : case_count;
BlockVisitor switch_logic_block(this, nullptr, kExprBlock);
CaseNode* root = OrderCases(&cases, zone_);
HandleCase(root, case_to_block, tag, default_block, 0);
if (root->left != nullptr || root->right != nullptr ||
root->begin == root->end) {
current_function_builder_->Emit(kExprBr);
current_function_builder_->EmitVarInt(default_block);
}
}
for (int i = 0; i < case_count; ++i) {
CaseClause* clause = clauses->at(i);
RECURSE(VisitStatements(clause->statements()));
BlockVisitor* v = blocks.at(case_count - i - 1);
blocks.pop_back();
delete v;
}
}
void VisitCaseClause(CaseClause* clause) { UNREACHABLE(); }
void VisitDoWhileStatement(DoWhileStatement* stmt) {
DCHECK_EQ(kFuncScope, scope_);
BlockVisitor block(this, stmt->AsBreakableStatement(), kExprBlock);
BlockVisitor loop(this, stmt->AsBreakableStatement(), kExprLoop);
RECURSE(Visit(stmt->body()));
RECURSE(Visit(stmt->cond()));
current_function_builder_->EmitWithU8(kExprIf, kLocalVoid);
current_function_builder_->EmitWithU8(kExprBr, 1);
current_function_builder_->Emit(kExprEnd);
}
void VisitWhileStatement(WhileStatement* stmt) {
DCHECK_EQ(kFuncScope, scope_);
BlockVisitor block(this, stmt->AsBreakableStatement(), kExprBlock);
BlockVisitor loop(this, stmt->AsBreakableStatement(), kExprLoop);
RECURSE(Visit(stmt->cond()));
breakable_blocks_.push_back(std::make_pair(nullptr, false));
current_function_builder_->EmitWithU8(kExprIf, kLocalVoid);
RECURSE(Visit(stmt->body()));
current_function_builder_->EmitWithU8(kExprBr, 1);
current_function_builder_->Emit(kExprEnd);
breakable_blocks_.pop_back();
}
void VisitForStatement(ForStatement* stmt) {
DCHECK_EQ(kFuncScope, scope_);
if (stmt->init() != nullptr) {
RECURSE(Visit(stmt->init()));
}
BlockVisitor block(this, stmt->AsBreakableStatement(), kExprBlock);
BlockVisitor loop(this, stmt->AsBreakableStatement(), kExprLoop);
if (stmt->cond() != nullptr) {
RECURSE(Visit(stmt->cond()));
current_function_builder_->Emit(kExprI32Eqz);
current_function_builder_->EmitWithU8(kExprIf, kLocalVoid);
current_function_builder_->EmitWithU8(kExprBr, 2);
current_function_builder_->Emit(kExprEnd);
}
if (stmt->body() != nullptr) {
RECURSE(Visit(stmt->body()));
}
if (stmt->next() != nullptr) {
RECURSE(Visit(stmt->next()));
}
current_function_builder_->EmitWithU8(kExprBr, 0);
}
void VisitForInStatement(ForInStatement* stmt) { UNREACHABLE(); }
void VisitForOfStatement(ForOfStatement* stmt) { UNREACHABLE(); }
void VisitTryCatchStatement(TryCatchStatement* stmt) { UNREACHABLE(); }
void VisitTryFinallyStatement(TryFinallyStatement* stmt) { UNREACHABLE(); }
void VisitDebuggerStatement(DebuggerStatement* stmt) { UNREACHABLE(); }
void VisitFunctionLiteral(FunctionLiteral* expr) {
DeclarationScope* scope = expr->scope();
if (scope_ == kFuncScope) {
if (auto* func_type = typer_->TypeOf(expr)->AsFunctionType()) {
// Add the parameters for the function.
const auto& arguments = func_type->Arguments();
for (int i = 0; i < expr->parameter_count(); ++i) {
LocalType type = TypeFrom(arguments[i]);
DCHECK_NE(kAstStmt, type);
InsertParameter(scope->parameter(i), type, i);
}
} else {
UNREACHABLE();
}
}
RECURSE(VisitDeclarations(scope->declarations()));
if (typer_failed_) return;
RECURSE(VisitStatements(expr->body()));
}
void VisitNativeFunctionLiteral(NativeFunctionLiteral* expr) {
UNREACHABLE();
}
void VisitConditional(Conditional* expr) {
DCHECK_EQ(kFuncScope, scope_);
RECURSE(Visit(expr->condition()));
// WASM ifs come with implicit blocks for both arms.
breakable_blocks_.push_back(std::make_pair(nullptr, false));
LocalTypeCode type;
switch (TypeOf(expr)) {
case kAstI32:
type = kLocalI32;
break;
case kAstI64:
type = kLocalI64;
break;
case kAstF32:
type = kLocalF32;
break;
case kAstF64:
type = kLocalF64;
break;
default:
UNREACHABLE();
}
current_function_builder_->EmitWithU8(kExprIf, type);
RECURSE(Visit(expr->then_expression()));
current_function_builder_->Emit(kExprElse);
RECURSE(Visit(expr->else_expression()));
current_function_builder_->Emit(kExprEnd);
breakable_blocks_.pop_back();
}
bool VisitStdlibConstant(Variable* var) {
AsmTyper::StandardMember standard_object =
typer_->VariableAsStandardMember(var);
double value;
switch (standard_object) {
case AsmTyper::kInfinity: {
value = std::numeric_limits<double>::infinity();
break;
}
case AsmTyper::kNaN: {
value = std::numeric_limits<double>::quiet_NaN();
break;
}
case AsmTyper::kMathE: {
value = M_E;
break;
}
case AsmTyper::kMathLN10: {
value = M_LN10;
break;
}
case AsmTyper::kMathLN2: {
value = M_LN2;
break;
}
case AsmTyper::kMathLOG10E: {
value = M_LOG10E;
break;
}
case AsmTyper::kMathLOG2E: {
value = M_LOG2E;
break;
}
case AsmTyper::kMathPI: {
value = M_PI;
break;
}
case AsmTyper::kMathSQRT1_2: {
value = M_SQRT1_2;
break;
}
case AsmTyper::kMathSQRT2: {
value = M_SQRT2;
break;
}
default: { return false; }
}
byte code[] = {WASM_F64(value)};
current_function_builder_->EmitCode(code, sizeof(code));
return true;
}
void VisitVariableProxy(VariableProxy* expr) {
if (scope_ == kFuncScope || scope_ == kInitScope) {
Variable* var = expr->var();
if (VisitStdlibConstant(var)) {
return;
}
LocalType var_type = TypeOf(expr);
DCHECK_NE(kAstStmt, var_type);
if (var->IsContextSlot()) {
current_function_builder_->EmitWithVarInt(
kExprGetGlobal, LookupOrInsertGlobal(var, var_type));
} else {
current_function_builder_->EmitGetLocal(
LookupOrInsertLocal(var, var_type));
}
} else if (scope_ == kExportScope) {
Variable* var = expr->var();
DCHECK(var->is_function());
WasmFunctionBuilder* function = LookupOrInsertFunction(var);
function->ExportAs(CStrVector(AsmWasmBuilder::single_function_name));
}
}
void VisitLiteral(Literal* expr) {
Handle<Object> value = expr->value();
if (!(value->IsNumber() || expr->raw_value()->IsTrue() ||
expr->raw_value()->IsFalse()) ||
(scope_ != kFuncScope && scope_ != kInitScope)) {
return;
}
AsmType* type = typer_->TypeOf(expr);
DCHECK_NE(type, AsmType::None());
if (type->IsA(AsmType::Signed())) {
int32_t i = 0;
if (!value->ToInt32(&i)) {
UNREACHABLE();
}
byte code[] = {WASM_I32V(i)};
current_function_builder_->EmitCode(code, sizeof(code));
} else if (type->IsA(AsmType::Unsigned()) || type->IsA(AsmType::FixNum())) {
uint32_t u = 0;
if (!value->ToUint32(&u)) {
UNREACHABLE();
}
int32_t i = static_cast<int32_t>(u);
byte code[] = {WASM_I32V(i)};
current_function_builder_->EmitCode(code, sizeof(code));
} else if (type->IsA(AsmType::Int())) {
// The parser can collapse !0, !1 etc to true / false.
// Allow these as int literals.
if (expr->raw_value()->IsTrue()) {
byte code[] = {WASM_I32V(1)};
current_function_builder_->EmitCode(code, sizeof(code));
} else if (expr->raw_value()->IsFalse()) {
byte code[] = {WASM_I32V(0)};
current_function_builder_->EmitCode(code, sizeof(code));
} else if (expr->raw_value()->IsNumber()) {
// This can happen when -x becomes x * -1 (due to the parser).
int32_t i = 0;
if (!value->ToInt32(&i) || i != -1) {
UNREACHABLE();
}
byte code[] = {WASM_I32V(i)};
current_function_builder_->EmitCode(code, sizeof(code));
} else {
UNREACHABLE();
}
} else if (type->IsA(AsmType::Double())) {
// TODO(bradnelson): Pattern match the case where negation occurs and
// emit f64.neg instead.
double val = expr->raw_value()->AsNumber();
byte code[] = {WASM_F64(val)};
current_function_builder_->EmitCode(code, sizeof(code));
} else if (type->IsA(AsmType::Float())) {
// This can happen when -fround(x) becomes fround(x) * 1.0[float]
// (due to the parser).
// TODO(bradnelson): Pattern match this and emit f32.neg instead.
double val = expr->raw_value()->AsNumber();
DCHECK_EQ(-1.0, val);
byte code[] = {WASM_F32(val)};
current_function_builder_->EmitCode(code, sizeof(code));
} else {
UNREACHABLE();
}
}
void VisitRegExpLiteral(RegExpLiteral* expr) { UNREACHABLE(); }
void VisitObjectLiteral(ObjectLiteral* expr) {
ZoneList<ObjectLiteralProperty*>* props = expr->properties();
for (int i = 0; i < props->length(); ++i) {
ObjectLiteralProperty* prop = props->at(i);
DCHECK_EQ(kExportScope, scope_);
VariableProxy* expr = prop->value()->AsVariableProxy();
DCHECK_NOT_NULL(expr);
Variable* var = expr->var();
Literal* name = prop->key()->AsLiteral();
DCHECK_NOT_NULL(name);
DCHECK(name->IsPropertyName());
Handle<String> function_name = name->AsPropertyName();
int length;
std::unique_ptr<char[]> utf8 = function_name->ToCString(
DISALLOW_NULLS, FAST_STRING_TRAVERSAL, &length);
if (var->is_function()) {
WasmFunctionBuilder* function = LookupOrInsertFunction(var);
function->ExportAs({utf8.get(), length});
}
}
}
void VisitArrayLiteral(ArrayLiteral* expr) { UNREACHABLE(); }
void LoadInitFunction() {
current_function_builder_ = init_function_;
scope_ = kInitScope;
}
void UnLoadInitFunction() {
scope_ = kModuleScope;
current_function_builder_ = nullptr;
}
struct FunctionTableIndices : public ZoneObject {
uint32_t start_index;
uint32_t signature_index;
};
FunctionTableIndices* LookupOrAddFunctionTable(VariableProxy* table,
Property* p) {
FunctionTableIndices* indices = LookupFunctionTable(table->var());
if (indices != nullptr) {
// Already setup.
return indices;
}
indices = new (zone()) FunctionTableIndices();
auto* func_type = typer_->TypeOf(p)->AsFunctionType();
auto* func_table_type = typer_->TypeOf(p->obj()->AsVariableProxy()->var())
->AsFunctionTableType();
const auto& arguments = func_type->Arguments();
LocalType return_type = TypeFrom(func_type->ReturnType());
FunctionSig::Builder sig(zone(), return_type == kAstStmt ? 0 : 1,
arguments.size());
if (return_type != kAstStmt) {
sig.AddReturn(return_type);
}
for (auto* arg : arguments) {
sig.AddParam(TypeFrom(arg));
}
uint32_t signature_index = builder_->AddSignature(sig.Build());
indices->start_index = builder_->AllocateIndirectFunctions(
static_cast<uint32_t>(func_table_type->length()));
indices->signature_index = signature_index;
ZoneHashMap::Entry* entry = function_tables_.LookupOrInsert(
table->var(), ComputePointerHash(table->var()),
ZoneAllocationPolicy(zone()));
entry->value = indices;
return indices;
}
FunctionTableIndices* LookupFunctionTable(Variable* v) {
ZoneHashMap::Entry* entry =
function_tables_.Lookup(v, ComputePointerHash(v));
if (entry == nullptr) {
return nullptr;
}
return reinterpret_cast<FunctionTableIndices*>(entry->value);
}
void PopulateFunctionTable(VariableProxy* table, ArrayLiteral* funcs) {
FunctionTableIndices* indices = LookupFunctionTable(table->var());
// Ignore unused function tables.
if (indices == nullptr) {
return;
}
for (int i = 0; i < funcs->values()->length(); ++i) {
VariableProxy* func = funcs->values()->at(i)->AsVariableProxy();
DCHECK_NOT_NULL(func);
builder_->SetIndirectFunction(
indices->start_index + i,
LookupOrInsertFunction(func->var())->func_index());
}
}
class ImportedFunctionTable {
private:
class ImportedFunctionIndices : public ZoneObject {
public:
const char* name_;
int name_length_;
WasmModuleBuilder::SignatureMap signature_to_index_;
ImportedFunctionIndices(const char* name, int name_length, Zone* zone)
: name_(name), name_length_(name_length), signature_to_index_(zone) {}
};
ZoneHashMap table_;
AsmWasmBuilderImpl* builder_;
public:
explicit ImportedFunctionTable(AsmWasmBuilderImpl* builder)
: table_(ZoneHashMap::kDefaultHashMapCapacity,
ZoneAllocationPolicy(builder->zone())),
builder_(builder) {}
ImportedFunctionIndices* LookupOrInsertImport(Variable* v) {
auto* entry = table_.LookupOrInsert(
v, ComputePointerHash(v), ZoneAllocationPolicy(builder_->zone()));
ImportedFunctionIndices* indices;
if (entry->value == nullptr) {
indices = new (builder_->zone())
ImportedFunctionIndices(nullptr, 0, builder_->zone());
entry->value = indices;
} else {
indices = reinterpret_cast<ImportedFunctionIndices*>(entry->value);
}
return indices;
}
void SetImportName(Variable* v, const char* name, int name_length) {
auto* indices = LookupOrInsertImport(v);
indices->name_ = name;
indices->name_length_ = name_length;
for (auto i : indices->signature_to_index_) {
builder_->builder_->SetImportName(i.second, indices->name_,
indices->name_length_);
}
}
// Get a function's index (or allocate if new).
uint32_t LookupOrInsertImportUse(Variable* v, FunctionSig* sig) {
auto* indices = LookupOrInsertImport(v);
WasmModuleBuilder::SignatureMap::iterator pos =
indices->signature_to_index_.find(sig);
if (pos != indices->signature_to_index_.end()) {
return pos->second;
} else {
uint32_t index = builder_->builder_->AddImport(
indices->name_, indices->name_length_, sig);
indices->signature_to_index_[sig] = index;
return index;
}
}
};
void EmitAssignmentLhs(Expression* target, AsmType** atype) {
// Match the left hand side of the assignment.
VariableProxy* target_var = target->AsVariableProxy();
if (target_var != nullptr) {
// Left hand side is a local or a global variable, no code on LHS.
return;
}
Property* target_prop = target->AsProperty();
if (target_prop != nullptr) {
// Left hand side is a property access, i.e. the asm.js heap.
VisitPropertyAndEmitIndex(target_prop, atype);
return;
}
if (target_var == nullptr && target_prop == nullptr) {
UNREACHABLE(); // invalid assignment.
}
}
void EmitAssignmentRhs(Expression* target, Expression* value, bool* is_nop) {
BinaryOperation* binop = value->AsBinaryOperation();
if (binop != nullptr) {
if (scope_ == kInitScope) {
// Handle foreign variables in the initialization scope.
Property* prop = binop->left()->AsProperty();
if (binop->op() == Token::MUL) {
DCHECK(binop->right()->IsLiteral());
DCHECK_EQ(1.0, binop->right()->AsLiteral()->raw_value()->AsNumber());
DCHECK(binop->right()->AsLiteral()->raw_value()->ContainsDot());
DCHECK(target->IsVariableProxy());
VisitForeignVariable(true, target->AsVariableProxy()->var(), prop);
*is_nop = true;
return;
} else if (binop->op() == Token::BIT_OR) {
DCHECK(binop->right()->IsLiteral());
DCHECK_EQ(0.0, binop->right()->AsLiteral()->raw_value()->AsNumber());
DCHECK(!binop->right()->AsLiteral()->raw_value()->ContainsDot());
DCHECK(target->IsVariableProxy());
VisitForeignVariable(false, target->AsVariableProxy()->var(), prop);
*is_nop = true;
return;
} else {
UNREACHABLE();
}
}
if (MatchBinaryOperation(binop) == kAsIs) {
VariableProxy* target_var = target->AsVariableProxy();
VariableProxy* effective_value_var = GetLeft(binop)->AsVariableProxy();
if (target_var != nullptr && effective_value_var != nullptr &&
target_var->var() == effective_value_var->var()) {
*is_nop = true;
return;
}
}
}
RECURSE(Visit(value));
}
void EmitAssignment(Assignment* expr, AsmType* type, ValueFate fate) {
// Match the left hand side of the assignment.
VariableProxy* target_var = expr->target()->AsVariableProxy();
if (target_var != nullptr) {
// Left hand side is a local or a global variable.
Variable* var = target_var->var();
LocalType var_type = TypeOf(expr);
DCHECK_NE(kAstStmt, var_type);
if (var->IsContextSlot()) {
uint32_t index = LookupOrInsertGlobal(var, var_type);
current_function_builder_->EmitWithVarInt(kExprSetGlobal, index);
if (fate == kLeaveOnStack) {
current_function_builder_->EmitWithVarInt(kExprGetGlobal, index);
}
} else {
if (fate == kDrop) {
current_function_builder_->EmitSetLocal(
LookupOrInsertLocal(var, var_type));
} else {
current_function_builder_->EmitTeeLocal(
LookupOrInsertLocal(var, var_type));
}
}
}
Property* target_prop = expr->target()->AsProperty();
if (target_prop != nullptr) {
// Left hand side is a property access, i.e. the asm.js heap.
if (TypeOf(expr->value()) == kAstF64 && expr->target()->IsProperty() &&
typer_->TypeOf(expr->target()->AsProperty()->obj())
->IsA(AsmType::Float32Array())) {
current_function_builder_->Emit(kExprF32ConvertF64);
}
// Note that unlike StoreMem, AsmjsStoreMem ignores out-of-bounds writes.
WasmOpcode opcode;
if (type == AsmType::Int8Array()) {
opcode = kExprI32AsmjsStoreMem8;
} else if (type == AsmType::Uint8Array()) {
opcode = kExprI32AsmjsStoreMem8;
} else if (type == AsmType::Int16Array()) {
opcode = kExprI32AsmjsStoreMem16;
} else if (type == AsmType::Uint16Array()) {
opcode = kExprI32AsmjsStoreMem16;
} else if (type == AsmType::Int32Array()) {
opcode = kExprI32AsmjsStoreMem;
} else if (type == AsmType::Uint32Array()) {
opcode = kExprI32AsmjsStoreMem;
} else if (type == AsmType::Float32Array()) {
opcode = kExprF32AsmjsStoreMem;
} else if (type == AsmType::Float64Array()) {
opcode = kExprF64AsmjsStoreMem;
} else {
UNREACHABLE();
}
current_function_builder_->Emit(opcode);
if (fate == kDrop) {
// Asm.js stores to memory leave their result on the stack.
current_function_builder_->Emit(kExprDrop);
}
}
if (target_var == nullptr && target_prop == nullptr) {
UNREACHABLE(); // invalid assignment.
}
}
void VisitAssignment(Assignment* expr) {
VisitAssignment(expr, kLeaveOnStack);
}
void VisitAssignment(Assignment* expr, ValueFate fate) {
bool as_init = false;
if (scope_ == kModuleScope) {
// Skip extra assignment inserted by the parser when in this form:
// (function Module(a, b, c) {... })
if (expr->target()->IsVariableProxy() &&
expr->target()->AsVariableProxy()->var()->is_sloppy_function_name()) {
return;
}
Property* prop = expr->value()->AsProperty();
if (prop != nullptr) {
VariableProxy* vp = prop->obj()->AsVariableProxy();
if (vp != nullptr && vp->var()->IsParameter() &&
vp->var()->index() == 1) {
VariableProxy* target = expr->target()->AsVariableProxy();
if (typer_->TypeOf(target)->AsFFIType() != nullptr) {
const AstRawString* name =
prop->key()->AsLiteral()->AsRawPropertyName();
imported_function_table_.SetImportName(
target->var(), reinterpret_cast<const char*>(name->raw_data()),
name->length());
}
}
// Property values in module scope don't emit code, so return.
return;
}
ArrayLiteral* funcs = expr->value()->AsArrayLiteral();
if (funcs != nullptr) {
VariableProxy* target = expr->target()->AsVariableProxy();
DCHECK_NOT_NULL(target);
PopulateFunctionTable(target, funcs);
// Only add to the function table. No init needed.
return;
}
if (expr->value()->IsCallNew()) {
// No init code to emit for CallNew nodes.
return;
}
as_init = true;
}
if (as_init) LoadInitFunction();
AsmType* atype = AsmType::None();
bool is_nop = false;
EmitAssignmentLhs(expr->target(), &atype);
EmitAssignmentRhs(expr->target(), expr->value(), &is_nop);
if (!is_nop) {
EmitAssignment(expr, atype, fate);
}
if (as_init) UnLoadInitFunction();
}
void VisitYield(Yield* expr) { UNREACHABLE(); }
void VisitThrow(Throw* expr) { UNREACHABLE(); }
void VisitForeignVariable(bool is_float, Variable* var, Property* expr) {
DCHECK(expr->obj()->AsVariableProxy());
DCHECK(VariableLocation::PARAMETER ==
expr->obj()->AsVariableProxy()->var()->location());
DCHECK_EQ(1, expr->obj()->AsVariableProxy()->var()->index());
Literal* key_literal = expr->key()->AsLiteral();
DCHECK_NOT_NULL(key_literal);
if (!key_literal->value().is_null()) {
Handle<Name> name =
Object::ToName(isolate_, key_literal->value()).ToHandleChecked();
LocalType type = is_float ? kAstF64 : kAstI32;
foreign_variables_.push_back({name, var, type});
}
}
void VisitPropertyAndEmitIndex(Property* expr, AsmType** atype) {
Expression* obj = expr->obj();
*atype = typer_->TypeOf(obj);
int size = (*atype)->ElementSizeInBytes();
if (size == 1) {
// Allow more general expression in byte arrays than the spec
// strictly permits.
// Early versions of Emscripten emit HEAP8[HEAP32[..]|0] in
// places that strictly should be HEAP8[HEAP32[..]>>0].
RECURSE(Visit(expr->key()));
return;
}
Literal* value = expr->key()->AsLiteral();
if (value) {
DCHECK(value->raw_value()->IsNumber());
DCHECK_EQ(kAstI32, TypeOf(value));
int32_t val = static_cast<int32_t>(value->raw_value()->AsNumber());
// TODO(titzer): handle overflow here.
current_function_builder_->EmitI32Const(val * size);
return;
}
BinaryOperation* binop = expr->key()->AsBinaryOperation();
if (binop) {
DCHECK_EQ(Token::SAR, binop->op());
DCHECK(binop->right()->AsLiteral()->raw_value()->IsNumber());
DCHECK(kAstI32 == TypeOf(binop->right()->AsLiteral()));
DCHECK_EQ(size,
1 << static_cast<int>(
binop->right()->AsLiteral()->raw_value()->AsNumber()));
// Mask bottom bits to match asm.js behavior.
byte mask = static_cast<byte>(~(size - 1));
RECURSE(Visit(binop->left()));
current_function_builder_->EmitWithU8(kExprI8Const, mask);
current_function_builder_->Emit(kExprI32And);
return;
}
UNREACHABLE();
}
void VisitProperty(Property* expr) {
AsmType* type = AsmType::None();
VisitPropertyAndEmitIndex(expr, &type);
WasmOpcode opcode;
if (type == AsmType::Int8Array()) {
opcode = kExprI32AsmjsLoadMem8S;
} else if (type == AsmType::Uint8Array()) {
opcode = kExprI32AsmjsLoadMem8U;
} else if (type == AsmType::Int16Array()) {
opcode = kExprI32AsmjsLoadMem16S;
} else if (type == AsmType::Uint16Array()) {
opcode = kExprI32AsmjsLoadMem16U;
} else if (type == AsmType::Int32Array()) {
opcode = kExprI32AsmjsLoadMem;
} else if (type == AsmType::Uint32Array()) {
opcode = kExprI32AsmjsLoadMem;
} else if (type == AsmType::Float32Array()) {
opcode = kExprF32AsmjsLoadMem;
} else if (type == AsmType::Float64Array()) {
opcode = kExprF64AsmjsLoadMem;
} else {
UNREACHABLE();
}
current_function_builder_->Emit(opcode);
}
bool VisitStdlibFunction(Call* call, VariableProxy* expr) {
Variable* var = expr->var();
AsmTyper::StandardMember standard_object =
typer_->VariableAsStandardMember(var);
ZoneList<Expression*>* args = call->arguments();
LocalType call_type = TypeOf(call);
switch (standard_object) {
case AsmTyper::kNone: {
return false;
}
case AsmTyper::kMathAcos: {
VisitCallArgs(call);
DCHECK_EQ(kAstF64, call_type);
current_function_builder_->Emit(kExprF64Acos);
break;
}
case AsmTyper::kMathAsin: {
VisitCallArgs(call);
DCHECK_EQ(kAstF64, call_type);
current_function_builder_->Emit(kExprF64Asin);
break;
}
case AsmTyper::kMathAtan: {
VisitCallArgs(call);
DCHECK_EQ(kAstF64, call_type);
current_function_builder_->Emit(kExprF64Atan);
break;
}
case AsmTyper::kMathCos: {
VisitCallArgs(call);
DCHECK_EQ(kAstF64, call_type);
current_function_builder_->Emit(kExprF64Cos);
break;
}
case AsmTyper::kMathSin: {
VisitCallArgs(call);
DCHECK_EQ(kAstF64, call_type);
current_function_builder_->Emit(kExprF64Sin);
break;
}
case AsmTyper::kMathTan: {
VisitCallArgs(call);
DCHECK_EQ(kAstF64, call_type);
current_function_builder_->Emit(kExprF64Tan);
break;
}
case AsmTyper::kMathExp: {
VisitCallArgs(call);
DCHECK_EQ(kAstF64, call_type);
current_function_builder_->Emit(kExprF64Exp);
break;
}
case AsmTyper::kMathLog: {
VisitCallArgs(call);
DCHECK_EQ(kAstF64, call_type);
current_function_builder_->Emit(kExprF64Log);
break;
}
case AsmTyper::kMathCeil: {
VisitCallArgs(call);
if (call_type == kAstF32) {
current_function_builder_->Emit(kExprF32Ceil);
} else if (call_type == kAstF64) {
current_function_builder_->Emit(kExprF64Ceil);
} else {
UNREACHABLE();
}
break;
}
case AsmTyper::kMathFloor: {
VisitCallArgs(call);
if (call_type == kAstF32) {
current_function_builder_->Emit(kExprF32Floor);
} else if (call_type == kAstF64) {
current_function_builder_->Emit(kExprF64Floor);
} else {
UNREACHABLE();
}
break;
}
case AsmTyper::kMathSqrt: {
VisitCallArgs(call);
if (call_type == kAstF32) {
current_function_builder_->Emit(kExprF32Sqrt);
} else if (call_type == kAstF64) {
current_function_builder_->Emit(kExprF64Sqrt);
} else {
UNREACHABLE();
}
break;
}
case AsmTyper::kMathClz32: {
VisitCallArgs(call);
DCHECK(call_type == kAstI32);
current_function_builder_->Emit(kExprI32Clz);
break;
}
case AsmTyper::kMathAbs: {
if (call_type == kAstI32) {
WasmTemporary tmp(current_function_builder_, kAstI32);
// if set_local(tmp, x) < 0
Visit(call->arguments()->at(0));
current_function_builder_->EmitTeeLocal(tmp.index());
byte code[] = {WASM_I8(0)};
current_function_builder_->EmitCode(code, sizeof(code));
current_function_builder_->Emit(kExprI32LtS);
current_function_builder_->EmitWithU8(kExprIf, kLocalI32);
// then (0 - tmp)
current_function_builder_->EmitCode(code, sizeof(code));
current_function_builder_->EmitGetLocal(tmp.index());
current_function_builder_->Emit(kExprI32Sub);
// else tmp
current_function_builder_->Emit(kExprElse);
current_function_builder_->EmitGetLocal(tmp.index());
// end
current_function_builder_->Emit(kExprEnd);
} else if (call_type == kAstF32) {
VisitCallArgs(call);
current_function_builder_->Emit(kExprF32Abs);
} else if (call_type == kAstF64) {
VisitCallArgs(call);
current_function_builder_->Emit(kExprF64Abs);
} else {
UNREACHABLE();
}
break;
}
case AsmTyper::kMathMin: {
// TODO(bradnelson): Change wasm to match Math.min in asm.js mode.
if (call_type == kAstI32) {
WasmTemporary tmp_x(current_function_builder_, kAstI32);
WasmTemporary tmp_y(current_function_builder_, kAstI32);
// if set_local(tmp_x, x) < set_local(tmp_y, y)
Visit(call->arguments()->at(0));
current_function_builder_->EmitTeeLocal(tmp_x.index());
Visit(call->arguments()->at(1));
current_function_builder_->EmitTeeLocal(tmp_y.index());
current_function_builder_->Emit(kExprI32LeS);
current_function_builder_->EmitWithU8(kExprIf, kLocalI32);
// then tmp_x
current_function_builder_->EmitGetLocal(tmp_x.index());
// else tmp_y
current_function_builder_->Emit(kExprElse);
current_function_builder_->EmitGetLocal(tmp_y.index());
current_function_builder_->Emit(kExprEnd);
} else if (call_type == kAstF32) {
VisitCallArgs(call);
current_function_builder_->Emit(kExprF32Min);
} else if (call_type == kAstF64) {
VisitCallArgs(call);
current_function_builder_->Emit(kExprF64Min);
} else {
UNREACHABLE();
}
break;
}
case AsmTyper::kMathMax: {
// TODO(bradnelson): Change wasm to match Math.max in asm.js mode.
if (call_type == kAstI32) {
WasmTemporary tmp_x(current_function_builder_, kAstI32);
WasmTemporary tmp_y(current_function_builder_, kAstI32);
// if set_local(tmp_x, x) < set_local(tmp_y, y)
Visit(call->arguments()->at(0));
current_function_builder_->EmitTeeLocal(tmp_x.index());
Visit(call->arguments()->at(1));
current_function_builder_->EmitTeeLocal(tmp_y.index());
current_function_builder_->Emit(kExprI32LeS);
current_function_builder_->EmitWithU8(kExprIf, kLocalI32);
// then tmp_y
current_function_builder_->EmitGetLocal(tmp_y.index());
// else tmp_x
current_function_builder_->Emit(kExprElse);
current_function_builder_->EmitGetLocal(tmp_x.index());
current_function_builder_->Emit(kExprEnd);
} else if (call_type == kAstF32) {
VisitCallArgs(call);
current_function_builder_->Emit(kExprF32Max);
} else if (call_type == kAstF64) {
VisitCallArgs(call);
current_function_builder_->Emit(kExprF64Max);
} else {
UNREACHABLE();
}
break;
}
case AsmTyper::kMathAtan2: {
VisitCallArgs(call);
DCHECK_EQ(kAstF64, call_type);
current_function_builder_->Emit(kExprF64Atan2);
break;
}
case AsmTyper::kMathPow: {
VisitCallArgs(call);
DCHECK_EQ(kAstF64, call_type);
current_function_builder_->Emit(kExprF64Pow);
break;
}
case AsmTyper::kMathImul: {
VisitCallArgs(call);
current_function_builder_->Emit(kExprI32Mul);
break;
}
case AsmTyper::kMathFround: {
DCHECK(args->length() == 1);
Literal* literal = args->at(0)->AsLiteral();
if (literal != nullptr) {
// constant fold Math.fround(#const);
if (literal->raw_value()->IsNumber()) {
float val = static_cast<float>(literal->raw_value()->AsNumber());
byte code[] = {WASM_F32(val)};
current_function_builder_->EmitCode(code, sizeof(code));
return true;
}
}
VisitCallArgs(call);
static const bool kDontIgnoreSign = false;
switch (TypeIndexOf(args->at(0), kDontIgnoreSign)) {
case kInt32:
case kFixnum:
current_function_builder_->Emit(kExprF32SConvertI32);
break;
case kUint32:
current_function_builder_->Emit(kExprF32UConvertI32);
break;
case kFloat32:
break;
case kFloat64:
current_function_builder_->Emit(kExprF32ConvertF64);
break;
default:
UNREACHABLE();
}
break;
}
default: {
UNREACHABLE();
break;
}
}
return true;
}
void VisitCallArgs(Call* expr) {
ZoneList<Expression*>* args = expr->arguments();
for (int i = 0; i < args->length(); ++i) {
Expression* arg = args->at(i);
RECURSE(Visit(arg));
}
}
void VisitCall(Call* expr) { VisitCallExpression(expr); }
bool VisitCallExpression(Call* expr) {
Call::CallType call_type = expr->GetCallType();
bool returns_value = true;
// Save the parent now, it might be overwritten in VisitCallArgs.
BinaryOperation* parent_binop = parent_binop_;
switch (call_type) {
case Call::OTHER_CALL: {
VariableProxy* proxy = expr->expression()->AsVariableProxy();
if (proxy != nullptr) {
DCHECK(kFuncScope == scope_ ||
typer_->VariableAsStandardMember(proxy->var()) ==
AsmTyper::kMathFround);
if (VisitStdlibFunction(expr, proxy)) {
return true;
}
}
DCHECK(kFuncScope == scope_);
VariableProxy* vp = expr->expression()->AsVariableProxy();
DCHECK_NOT_NULL(vp);
if (typer_->TypeOf(vp)->AsFFIType() != nullptr) {
LocalType return_type = TypeOf(expr);
ZoneList<Expression*>* args = expr->arguments();
FunctionSig::Builder sig(zone(), return_type == kAstStmt ? 0 : 1,
args->length());
if (return_type != kAstStmt) {
sig.AddReturn(return_type);
} else {
returns_value = false;
}
for (int i = 0; i < args->length(); ++i) {
sig.AddParam(TypeOf(args->at(i)));
}
uint32_t index = imported_function_table_.LookupOrInsertImportUse(
vp->var(), sig.Build());
VisitCallArgs(expr);
// For non-void functions, we must know the parent node.
DCHECK_IMPLIES(returns_value, parent_binop != nullptr);
DCHECK_IMPLIES(returns_value, parent_binop->left() == expr ||
parent_binop->right() == expr);
int pos = expr->position();
int parent_pos = returns_value ? parent_binop->position() : pos;
current_function_builder_->AddAsmWasmOffset(pos, parent_pos);
current_function_builder_->Emit(kExprCallFunction);
current_function_builder_->EmitVarInt(index);
} else {
WasmFunctionBuilder* function = LookupOrInsertFunction(vp->var());
VisitCallArgs(expr);
current_function_builder_->AddAsmWasmOffset(expr->position(),
expr->position());
current_function_builder_->Emit(kExprCallFunction);
current_function_builder_->EmitDirectCallIndex(
function->func_index());
returns_value = function->signature()->return_count() > 0;
}
break;
}
case Call::KEYED_PROPERTY_CALL: {
DCHECK_EQ(kFuncScope, scope_);
Property* p = expr->expression()->AsProperty();
DCHECK_NOT_NULL(p);
VariableProxy* var = p->obj()->AsVariableProxy();
DCHECK_NOT_NULL(var);
FunctionTableIndices* indices = LookupOrAddFunctionTable(var, p);
Visit(p->key()); // TODO(titzer): should use RECURSE()
// We have to use a temporary for the correct order of evaluation.
current_function_builder_->EmitI32Const(indices->start_index);
current_function_builder_->Emit(kExprI32Add);
WasmTemporary tmp(current_function_builder_, kAstI32);
current_function_builder_->EmitSetLocal(tmp.index());
VisitCallArgs(expr);
current_function_builder_->EmitGetLocal(tmp.index());
current_function_builder_->AddAsmWasmOffset(expr->position(),
expr->position());
current_function_builder_->Emit(kExprCallIndirect);
current_function_builder_->EmitVarInt(indices->signature_index);
current_function_builder_->EmitVarInt(0); // table index
returns_value =
builder_->GetSignature(indices->signature_index)->return_count() >
0;
break;
}
default:
UNREACHABLE();
}
return returns_value;
}
void VisitCallNew(CallNew* expr) { UNREACHABLE(); }
void VisitCallRuntime(CallRuntime* expr) { UNREACHABLE(); }
void VisitUnaryOperation(UnaryOperation* expr) {
RECURSE(Visit(expr->expression()));
switch (expr->op()) {
case Token::NOT: {
DCHECK_EQ(kAstI32, TypeOf(expr->expression()));
current_function_builder_->Emit(kExprI32Eqz);
break;
}
default:
UNREACHABLE();
}
}
void VisitCountOperation(CountOperation* expr) { UNREACHABLE(); }
bool MatchIntBinaryOperation(BinaryOperation* expr, Token::Value op,
int32_t val) {
DCHECK_NOT_NULL(expr->right());
if (expr->op() == op && expr->right()->IsLiteral() &&
TypeOf(expr) == kAstI32) {
Literal* right = expr->right()->AsLiteral();
DCHECK(right->raw_value()->IsNumber());
if (static_cast<int32_t>(right->raw_value()->AsNumber()) == val) {
return true;
}
}
return false;
}
bool MatchDoubleBinaryOperation(BinaryOperation* expr, Token::Value op,
double val) {
DCHECK_NOT_NULL(expr->right());
if (expr->op() == op && expr->right()->IsLiteral() &&
TypeOf(expr) == kAstF64) {
Literal* right = expr->right()->AsLiteral();
DCHECK(right->raw_value()->IsNumber());
if (right->raw_value()->AsNumber() == val) {
return true;
}
}
return false;
}
enum ConvertOperation { kNone, kAsIs, kToInt, kToDouble };
ConvertOperation MatchOr(BinaryOperation* expr) {
if (MatchIntBinaryOperation(expr, Token::BIT_OR, 0) &&
(TypeOf(expr->left()) == kAstI32)) {
return kAsIs;
} else {
return kNone;
}
}
ConvertOperation MatchShr(BinaryOperation* expr) {
if (MatchIntBinaryOperation(expr, Token::SHR, 0)) {
// TODO(titzer): this probably needs to be kToUint
return (TypeOf(expr->left()) == kAstI32) ? kAsIs : kToInt;
} else {
return kNone;
}
}
ConvertOperation MatchXor(BinaryOperation* expr) {
if (MatchIntBinaryOperation(expr, Token::BIT_XOR, 0xffffffff)) {
DCHECK_EQ(kAstI32, TypeOf(expr->left()));
DCHECK_EQ(kAstI32, TypeOf(expr->right()));
BinaryOperation* op = expr->left()->AsBinaryOperation();
if (op != nullptr) {
if (MatchIntBinaryOperation(op, Token::BIT_XOR, 0xffffffff)) {
DCHECK_EQ(kAstI32, TypeOf(op->right()));
if (TypeOf(op->left()) != kAstI32) {
return kToInt;
} else {
return kAsIs;
}
}
}
}
return kNone;
}
ConvertOperation MatchMul(BinaryOperation* expr) {
if (MatchDoubleBinaryOperation(expr, Token::MUL, 1.0)) {
DCHECK_EQ(kAstF64, TypeOf(expr->right()));
if (TypeOf(expr->left()) != kAstF64) {
return kToDouble;
} else {
return kAsIs;
}
} else {
return kNone;
}
}
ConvertOperation MatchBinaryOperation(BinaryOperation* expr) {
switch (expr->op()) {
case Token::BIT_OR:
return MatchOr(expr);
case Token::SHR:
return MatchShr(expr);
case Token::BIT_XOR:
return MatchXor(expr);
case Token::MUL:
return MatchMul(expr);
default:
return kNone;
}
}
// Work around Mul + Div being defined in PPC assembler.
#ifdef Mul
#undef Mul
#endif
#define NON_SIGNED_BINOP(op) \
static WasmOpcode opcodes[] = { \
kExprI32##op, \
kExprI32##op, \
kExprF32##op, \
kExprF64##op \
}
#define SIGNED_BINOP(op) \
static WasmOpcode opcodes[] = { \
kExprI32##op##S, \
kExprI32##op##U, \
kExprF32##op, \
kExprF64##op \
}
#define NON_SIGNED_INT_BINOP(op) \
static WasmOpcode opcodes[] = { kExprI32##op, kExprI32##op }
#define BINOP_CASE(token, op, V, ignore_sign) \
case token: { \
V(op); \
int type = TypeIndexOf(expr->left(), expr->right(), ignore_sign); \
current_function_builder_->Emit(opcodes[type]); \
break; \
}
Expression* GetLeft(BinaryOperation* expr) {
if (expr->op() == Token::BIT_XOR) {
return expr->left()->AsBinaryOperation()->left();
} else {
return expr->left();
}
}
void VisitBinaryOperation(BinaryOperation* expr) {
ConvertOperation convertOperation = MatchBinaryOperation(expr);
static const bool kDontIgnoreSign = false;
parent_binop_ = expr;
if (convertOperation == kToDouble) {
RECURSE(Visit(expr->left()));
TypeIndex type = TypeIndexOf(expr->left(), kDontIgnoreSign);
if (type == kInt32 || type == kFixnum) {
current_function_builder_->Emit(kExprF64SConvertI32);
} else if (type == kUint32) {
current_function_builder_->Emit(kExprF64UConvertI32);
} else if (type == kFloat32) {
current_function_builder_->Emit(kExprF64ConvertF32);
} else {
UNREACHABLE();
}
} else if (convertOperation == kToInt) {
RECURSE(Visit(GetLeft(expr)));
TypeIndex type = TypeIndexOf(GetLeft(expr), kDontIgnoreSign);
if (type == kFloat32) {
current_function_builder_->Emit(kExprI32AsmjsSConvertF32);
} else if (type == kFloat64) {
current_function_builder_->Emit(kExprI32AsmjsSConvertF64);
} else {
UNREACHABLE();
}
} else if (convertOperation == kAsIs) {
RECURSE(Visit(GetLeft(expr)));
} else {
if (expr->op() == Token::COMMA) {
RECURSE(VisitForEffect(expr->left()));
RECURSE(Visit(expr->right()));
return;
}
RECURSE(Visit(expr->left()));
RECURSE(Visit(expr->right()));
switch (expr->op()) {
BINOP_CASE(Token::ADD, Add, NON_SIGNED_BINOP, true);
BINOP_CASE(Token::SUB, Sub, NON_SIGNED_BINOP, true);
BINOP_CASE(Token::MUL, Mul, NON_SIGNED_BINOP, true);
BINOP_CASE(Token::BIT_OR, Ior, NON_SIGNED_INT_BINOP, true);
BINOP_CASE(Token::BIT_AND, And, NON_SIGNED_INT_BINOP, true);
BINOP_CASE(Token::BIT_XOR, Xor, NON_SIGNED_INT_BINOP, true);
BINOP_CASE(Token::SHL, Shl, NON_SIGNED_INT_BINOP, true);
BINOP_CASE(Token::SAR, ShrS, NON_SIGNED_INT_BINOP, true);
BINOP_CASE(Token::SHR, ShrU, NON_SIGNED_INT_BINOP, true);
case Token::DIV: {
static WasmOpcode opcodes[] = {kExprI32AsmjsDivS, kExprI32AsmjsDivU,
kExprF32Div, kExprF64Div};
int type = TypeIndexOf(expr->left(), expr->right(), false);
current_function_builder_->Emit(opcodes[type]);
break;
}
case Token::MOD: {
TypeIndex type = TypeIndexOf(expr->left(), expr->right(), false);
if (type == kInt32) {
current_function_builder_->Emit(kExprI32AsmjsRemS);
} else if (type == kUint32) {
current_function_builder_->Emit(kExprI32AsmjsRemU);
} else if (type == kFloat64) {
current_function_builder_->Emit(kExprF64Mod);
return;
} else {
UNREACHABLE();
}
break;
}
case Token::COMMA: {
break;
}
default:
UNREACHABLE();
}
}
}
void VisitCompareOperation(CompareOperation* expr) {
RECURSE(Visit(expr->left()));
RECURSE(Visit(expr->right()));
switch (expr->op()) {
BINOP_CASE(Token::EQ, Eq, NON_SIGNED_BINOP, false);
BINOP_CASE(Token::LT, Lt, SIGNED_BINOP, false);
BINOP_CASE(Token::LTE, Le, SIGNED_BINOP, false);
BINOP_CASE(Token::GT, Gt, SIGNED_BINOP, false);
BINOP_CASE(Token::GTE, Ge, SIGNED_BINOP, false);
default:
UNREACHABLE();
}
}
#undef BINOP_CASE
#undef NON_SIGNED_INT_BINOP
#undef SIGNED_BINOP
#undef NON_SIGNED_BINOP
enum TypeIndex {
kInt32 = 0,
kUint32 = 1,
kFloat32 = 2,
kFloat64 = 3,
kFixnum = 4
};
TypeIndex TypeIndexOf(Expression* left, Expression* right, bool ignore_sign) {
TypeIndex left_index = TypeIndexOf(left, ignore_sign);
TypeIndex right_index = TypeIndexOf(right, ignore_sign);
if (left_index == kFixnum) {
left_index = right_index;
}
if (right_index == kFixnum) {
right_index = left_index;
}
if (left_index == kFixnum && right_index == kFixnum) {
left_index = kInt32;
right_index = kInt32;
}
if (left_index != right_index) {
DCHECK(ignore_sign && (left_index <= 1) && (right_index <= 1));
}
return left_index;
}
TypeIndex TypeIndexOf(Expression* expr, bool ignore_sign) {
AsmType* type = typer_->TypeOf(expr);
if (type->IsA(AsmType::FixNum())) {
return kFixnum;
}
if (type->IsA(AsmType::Signed())) {
return kInt32;
}
if (type->IsA(AsmType::Unsigned())) {
return kUint32;
}
if (type->IsA(AsmType::Intish())) {
if (!ignore_sign) {
// TODO(jpp): log a warning and move on.
}
return kInt32;
}
if (type->IsA(AsmType::Floatish())) {
return kFloat32;
}
if (type->IsA(AsmType::DoubleQ())) {
return kFloat64;
}
UNREACHABLE();
return kInt32;
}
#undef CASE
#undef NON_SIGNED_INT
#undef SIGNED
#undef NON_SIGNED
void VisitThisFunction(ThisFunction* expr) { UNREACHABLE(); }
void VisitDeclarations(Declaration::List* decls) {
for (Declaration* decl : *decls) {
RECURSE(Visit(decl));
if (typer_failed_) {
return;
}
}
}
void VisitClassLiteral(ClassLiteral* expr) { UNREACHABLE(); }
void VisitSpread(Spread* expr) { UNREACHABLE(); }
void VisitSuperPropertyReference(SuperPropertyReference* expr) {
UNREACHABLE();
}
void VisitSuperCallReference(SuperCallReference* expr) { UNREACHABLE(); }
void VisitSloppyBlockFunctionStatement(SloppyBlockFunctionStatement* expr) {
UNREACHABLE();
}
void VisitDoExpression(DoExpression* expr) { UNREACHABLE(); }
void VisitRewritableExpression(RewritableExpression* expr) { UNREACHABLE(); }
struct IndexContainer : public ZoneObject {
uint32_t index;
};
uint32_t LookupOrInsertLocal(Variable* v, LocalType type) {
DCHECK_NOT_NULL(current_function_builder_);
ZoneHashMap::Entry* entry =
local_variables_.Lookup(v, ComputePointerHash(v));
if (entry == nullptr) {
uint32_t index;
DCHECK(!v->IsParameter());
index = current_function_builder_->AddLocal(type);
IndexContainer* container = new (zone()) IndexContainer();
container->index = index;
entry = local_variables_.LookupOrInsert(v, ComputePointerHash(v),
ZoneAllocationPolicy(zone()));
entry->value = container;
}
return (reinterpret_cast<IndexContainer*>(entry->value))->index;
}
void InsertParameter(Variable* v, LocalType type, uint32_t index) {
DCHECK(v->IsParameter());
DCHECK_NOT_NULL(current_function_builder_);
ZoneHashMap::Entry* entry =
local_variables_.Lookup(v, ComputePointerHash(v));
DCHECK_NULL(entry);
IndexContainer* container = new (zone()) IndexContainer();
container->index = index;
entry = local_variables_.LookupOrInsert(v, ComputePointerHash(v),
ZoneAllocationPolicy(zone()));
entry->value = container;
}
uint32_t LookupOrInsertGlobal(Variable* v, LocalType type) {
ZoneHashMap::Entry* entry =
global_variables_.Lookup(v, ComputePointerHash(v));
if (entry == nullptr) {
uint32_t index = builder_->AddGlobal(type, 0);
IndexContainer* container = new (zone()) IndexContainer();
container->index = index;
entry = global_variables_.LookupOrInsert(v, ComputePointerHash(v),
ZoneAllocationPolicy(zone()));
entry->value = container;
}
return (reinterpret_cast<IndexContainer*>(entry->value))->index;
}
WasmFunctionBuilder* LookupOrInsertFunction(Variable* v) {
DCHECK_NOT_NULL(builder_);
ZoneHashMap::Entry* entry = functions_.Lookup(v, ComputePointerHash(v));
if (entry == nullptr) {
auto* func_type = typer_->TypeOf(v)->AsFunctionType();
DCHECK_NOT_NULL(func_type);
// Build the signature for the function.
LocalType return_type = TypeFrom(func_type->ReturnType());
const auto& arguments = func_type->Arguments();
FunctionSig::Builder b(zone(), return_type == kAstStmt ? 0 : 1,
arguments.size());
if (return_type != kAstStmt) b.AddReturn(return_type);
for (int i = 0; i < static_cast<int>(arguments.size()); ++i) {
LocalType type = TypeFrom(arguments[i]);
DCHECK_NE(kAstStmt, type);
b.AddParam(type);
}
WasmFunctionBuilder* function = builder_->AddFunction(b.Build());
entry = functions_.LookupOrInsert(v, ComputePointerHash(v),
ZoneAllocationPolicy(zone()));
function->SetName(
{reinterpret_cast<const char*>(v->raw_name()->raw_data()),
v->raw_name()->length()});
entry->value = function;
}
return (reinterpret_cast<WasmFunctionBuilder*>(entry->value));
}
LocalType TypeOf(Expression* expr) { return TypeFrom(typer_->TypeOf(expr)); }
LocalType TypeFrom(AsmType* type) {
if (type->IsA(AsmType::Intish())) {
return kAstI32;
}
if (type->IsA(AsmType::Floatish())) {
return kAstF32;
}
if (type->IsA(AsmType::DoubleQ())) {
return kAstF64;
}
return kAstStmt;
}
Zone* zone() { return zone_; }
ZoneHashMap local_variables_;
ZoneHashMap functions_;
ZoneHashMap global_variables_;
AsmScope scope_;
WasmModuleBuilder* builder_;
WasmFunctionBuilder* current_function_builder_;
FunctionLiteral* literal_;
Isolate* isolate_;
Zone* zone_;
AstValueFactory* ast_value_factory_;
Handle<Script> script_;
AsmTyper* typer_;
bool typer_failed_;
ZoneVector<std::pair<BreakableStatement*, bool>> breakable_blocks_;
ZoneVector<ForeignVariable> foreign_variables_;
WasmFunctionBuilder* init_function_;
WasmFunctionBuilder* foreign_init_function_;
uint32_t next_table_index_;
ZoneHashMap function_tables_;
ImportedFunctionTable imported_function_table_;
// Remember the parent node for reporting the correct location for ToNumber
// conversions after calls.
BinaryOperation* parent_binop_;
DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
private:
DISALLOW_COPY_AND_ASSIGN(AsmWasmBuilderImpl);
};
AsmWasmBuilder::AsmWasmBuilder(Isolate* isolate, Zone* zone,
AstValueFactory* ast_value_factory,
Handle<Script> script, FunctionLiteral* literal)
: isolate_(isolate),
zone_(zone),
ast_value_factory_(ast_value_factory),
script_(script),
literal_(literal),
typer_(isolate, zone, script, literal) {}
// TODO(aseemgarg): probably should take zone (to write wasm to) as input so
// that zone in constructor may be thrown away once wasm module is written.
AsmWasmBuilder::Result AsmWasmBuilder::Run(Handle<FixedArray>* foreign_args) {
AsmWasmBuilderImpl impl(isolate_, zone_, ast_value_factory_, script_,
literal_, &typer_);
bool success = impl.Build();
*foreign_args = impl.GetForeignArgs();
ZoneBuffer* module_buffer = new (zone_) ZoneBuffer(zone_);
impl.builder_->WriteTo(*module_buffer);
ZoneBuffer* asm_offsets_buffer = new (zone_) ZoneBuffer(zone_);
impl.builder_->WriteAsmJsOffsetTable(*asm_offsets_buffer);
return {module_buffer, asm_offsets_buffer, success};
}
const char* AsmWasmBuilder::foreign_init_name = "__foreign_init__";
const char* AsmWasmBuilder::single_function_name = "__single_function__";
} // namespace wasm
} // namespace internal
} // namespace v8