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Unified Diff: src/asmjs/asm-parser.cc

Issue 2757693003: [wasm][asm.js] Asm.js -> wasm custom parser. (Closed)
Patch Set: fix Created 3 years, 9 months ago
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Index: src/asmjs/asm-parser.cc
diff --git a/src/asmjs/asm-parser.cc b/src/asmjs/asm-parser.cc
new file mode 100644
index 0000000000000000000000000000000000000000..59745c191de58d175f74820421d266403568142e
--- /dev/null
+++ b/src/asmjs/asm-parser.cc
@@ -0,0 +1,2375 @@
+// Copyright 2017 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/asmjs/asm-parser.h"
+
+// Required to get M_E etc. for MSVC.
+// References from STDLIB_MATH_VALUE_LIST in asm-names.h
+#if defined(_WIN32)
+#define _USE_MATH_DEFINES
+#endif
+#include <math.h>
+#include <string.h>
+
+#include <algorithm>
+
+#include "src/asmjs/asm-types.h"
+#include "src/objects-inl.h"
+#include "src/objects.h"
+#include "src/parsing/scanner-character-streams.h"
+#include "src/wasm/wasm-macro-gen.h"
+#include "src/wasm/wasm-opcodes.h"
+
+namespace v8 {
+namespace internal {
+namespace wasm {
+
+#ifdef DEBUG
+#define FAIL_AND_RETURN(ret, msg) \
+ failed_ = true; \
+ failure_message_ = std::string(msg) + \
+ " token: " + scanner_.Name(scanner_.Token()) + \
+ " see: " + __FILE__ + ":" + std::to_string(__LINE__); \
+ failure_location_ = scanner_.GetPosition(); \
+ return ret;
+#else
+#define FAIL_AND_RETURN(ret, msg) \
+ failed_ = true; \
+ failure_message_ = msg; \
+ failure_location_ = scanner_.GetPosition(); \
+ return ret;
+#endif
+
+#define FAIL(msg) FAIL_AND_RETURN(, msg)
+#define FAILn(msg) FAIL_AND_RETURN(nullptr, msg)
+#define FAILf(msg) FAIL_AND_RETURN(false, msg)
+
+#ifdef DEBUG
+#define EXPECT_TOKEN_OR_RETURN(ret, token) \
+ do { \
+ if (scanner_.Token() != token) { \
+ FAIL_AND_RETURN(ret, std::string("expected token ") + \
+ scanner_.Name(token) + " but found " + \
+ scanner_.Name(scanner_.Token())); \
+ } \
+ scanner_.Next(); \
+ } while (false);
+#else
+#define EXPECT_TOKEN_OR_RETURN(ret, token) \
+ do { \
+ if (scanner_.Token() != token) { \
+ FAIL_AND_RETURN(ret, "unexpected token"); \
+ } \
+ scanner_.Next(); \
+ } while (false);
+#endif
+
+#define EXPECT_TOKEN(token) EXPECT_TOKEN_OR_RETURN(, token)
+#define EXPECT_TOKENn(token) EXPECT_TOKEN_OR_RETURN(nullptr, token)
+#define EXPECT_TOKENf(token) EXPECT_TOKEN_OR_RETURN(false, token)
+
+#define RECURSE_OR_RETURN(ret, call) \
+ do { \
+ DCHECK(GetCurrentStackPosition() >= stack_limit_); \
+ DCHECK(!failed_); \
+ call; \
+ if (GetCurrentStackPosition() < stack_limit_) { \
+ FAIL_AND_RETURN(ret, "Stack overflow while parsing asm.js module."); \
+ } \
+ if (failed_) return ret; \
+ } while (false);
+
+#define RECURSE(call) RECURSE_OR_RETURN(, call)
+#define RECURSEn(call) RECURSE_OR_RETURN(nullptr, call)
+#define RECURSEf(call) RECURSE_OR_RETURN(false, call)
+
+#define TOK(name) AsmJsScanner::kToken_##name
+
+AsmJsParser::AsmJsParser(Isolate* isolate, Zone* zone, Handle<Script> script,
+ int start, int end)
+ : zone_(zone),
+ module_builder_(new (zone) WasmModuleBuilder(zone)),
+ return_type_(nullptr),
+ stack_limit_(isolate->stack_guard()->real_climit()),
+ global_var_info_(zone),
+ local_var_info_(zone),
+ failed_(false),
+ failure_location_(start),
+ stdlib_name_(kTokenNone),
+ foreign_name_(kTokenNone),
+ heap_name_(kTokenNone),
+ inside_heap_assignment_(false),
+ heap_access_type_(nullptr),
+ block_stack_(zone),
+ pending_label_(0),
+ global_imports_(zone) {
+ InitializeStdlibTypes();
+ Handle<String> source(String::cast(script->source()), isolate);
+ std::unique_ptr<Utf16CharacterStream> stream(
+ ScannerStream::For(source, start, end));
+ scanner_.SetStream(std::move(stream));
+}
+
+void AsmJsParser::InitializeStdlibTypes() {
+ auto* d = AsmType::Double();
+ auto* dq = AsmType::DoubleQ();
+ stdlib_dq2d_ = AsmType::Function(zone(), d);
+ stdlib_dq2d_->AsFunctionType()->AddArgument(dq);
+
+ stdlib_dqdq2d_ = AsmType::Function(zone(), d);
+ stdlib_dqdq2d_->AsFunctionType()->AddArgument(dq);
+ stdlib_dqdq2d_->AsFunctionType()->AddArgument(dq);
+
+ auto* f = AsmType::Float();
+ auto* fq = AsmType::FloatQ();
+ stdlib_fq2f_ = AsmType::Function(zone(), f);
+ stdlib_fq2f_->AsFunctionType()->AddArgument(fq);
+
+ auto* s = AsmType::Signed();
+ auto* s2s = AsmType::Function(zone(), s);
+ s2s->AsFunctionType()->AddArgument(s);
+
+ auto* i = AsmType::Int();
+ stdlib_i2s_ = AsmType::Function(zone_, s);
+ stdlib_i2s_->AsFunctionType()->AddArgument(i);
+
+ stdlib_ii2s_ = AsmType::Function(zone(), s);
+ stdlib_ii2s_->AsFunctionType()->AddArgument(i);
+ stdlib_ii2s_->AsFunctionType()->AddArgument(i);
+
+ auto* minmax_d = AsmType::MinMaxType(zone(), d, d);
+ // *VIOLATION* The float variant is not part of the spec, but firefox accepts
+ // it.
+ auto* minmax_f = AsmType::MinMaxType(zone(), f, f);
+ auto* minmax_i = AsmType::MinMaxType(zone(), s, i);
+ stdlib_minmax_ = AsmType::OverloadedFunction(zone());
+ stdlib_minmax_->AsOverloadedFunctionType()->AddOverload(minmax_i);
+ stdlib_minmax_->AsOverloadedFunctionType()->AddOverload(minmax_f);
+ stdlib_minmax_->AsOverloadedFunctionType()->AddOverload(minmax_d);
+
+ stdlib_abs_ = AsmType::OverloadedFunction(zone());
+ stdlib_abs_->AsOverloadedFunctionType()->AddOverload(s2s);
+ stdlib_abs_->AsOverloadedFunctionType()->AddOverload(stdlib_dq2d_);
+ stdlib_abs_->AsOverloadedFunctionType()->AddOverload(stdlib_fq2f_);
+
+ stdlib_ceil_like_ = AsmType::OverloadedFunction(zone());
+ stdlib_ceil_like_->AsOverloadedFunctionType()->AddOverload(stdlib_dq2d_);
+ stdlib_ceil_like_->AsOverloadedFunctionType()->AddOverload(stdlib_fq2f_);
+
+ stdlib_fround_ = AsmType::FroundType(zone());
+}
+
+FunctionSig* AsmJsParser::ConvertSignature(
+ AsmType* return_type, const std::vector<AsmType*>& params) {
+ FunctionSig::Builder sig_builder(
+ zone(), !return_type->IsA(AsmType::Void()) ? 1 : 0, params.size());
+ for (auto param : params) {
+ if (param->IsA(AsmType::Double())) {
+ sig_builder.AddParam(kWasmF64);
+ } else if (param->IsA(AsmType::Float())) {
+ sig_builder.AddParam(kWasmF32);
+ } else if (param->IsA(AsmType::Int())) {
+ sig_builder.AddParam(kWasmI32);
+ } else {
+ return nullptr;
+ }
+ }
+ if (!return_type->IsA(AsmType::Void())) {
+ if (return_type->IsA(AsmType::Double())) {
+ sig_builder.AddReturn(kWasmF64);
+ } else if (return_type->IsA(AsmType::Float())) {
+ sig_builder.AddReturn(kWasmF32);
+ } else if (return_type->IsA(AsmType::Signed())) {
+ sig_builder.AddReturn(kWasmI32);
+ } else {
+ return 0;
+ }
+ }
+ return sig_builder.Build();
+}
+
+bool AsmJsParser::Run() {
+ ValidateModule();
+ return !failed_;
+}
+
+AsmJsParser::VarInfo::VarInfo()
+ : type(AsmType::None()),
+ function_builder(nullptr),
+ import(nullptr),
+ mask(-1),
+ index(0),
+ kind(VarKind::kUnused),
+ mutable_variable(true),
+ function_defined(false) {}
+
+wasm::AsmJsParser::VarInfo* AsmJsParser::GetVarInfo(
+ AsmJsScanner::token_t token) {
+ if (AsmJsScanner::IsGlobal(token)) {
+ size_t old = global_var_info_.size();
+ size_t index = AsmJsScanner::GlobalIndex(token);
+ size_t sz = std::max(old, index + 1);
+ if (sz != old) {
+ global_var_info_.resize(sz);
+ }
+ return &global_var_info_[index];
+ } else if (AsmJsScanner::IsLocal(token)) {
+ size_t old = local_var_info_.size();
+ size_t index = AsmJsScanner::LocalIndex(token);
+ size_t sz = std::max(old, index + 1);
+ if (sz != old) {
+ local_var_info_.resize(sz);
+ }
+ return &local_var_info_[index];
+ }
+ UNREACHABLE();
+ return nullptr;
+}
+
+uint32_t AsmJsParser::VarIndex(VarInfo* info) {
+ if (info->import != nullptr) {
+ return info->index;
+ } else {
+ return info->index + static_cast<uint32_t>(global_imports_.size());
+ }
+}
+
+void AsmJsParser::AddGlobalImport(std::string name, AsmType* type,
+ ValueType vtype, bool mutable_variable,
+ VarInfo* info) {
+ if (mutable_variable) {
+ // Allocate a separate variable for the import.
+ DeclareGlobal(info, true, type, vtype);
+ // Record the need to initialize the global from the import.
+ global_imports_.push_back({name, 0, info->index, true});
+ } else {
+ // Just use the import directly.
+ global_imports_.push_back({name, 0, info->index, false});
+ }
+ GlobalImport& gi = global_imports_.back();
+ // TODO(bradnelson): Reuse parse buffer memory / make wasm-module-builder
+ // managed the memory for the import name (currently have to keep our
+ // own memory for it).
+ gi.import_index = module_builder_->AddGlobalImport(
+ name.data(), static_cast<int>(name.size()), vtype);
+ if (!mutable_variable) {
+ info->DeclareGlobalImport(type, gi.import_index);
+ }
+}
+
+void AsmJsParser::VarInfo::DeclareGlobalImport(AsmType* type, uint32_t index) {
+ kind = VarKind::kGlobal;
+ this->type = type;
+ this->index = index;
+ mutable_variable = false;
+}
+
+void AsmJsParser::VarInfo::DeclareStdlibFunc(VarKind kind, AsmType* type) {
+ this->kind = kind;
+ this->type = type;
+ index = 0; // unused
+ mutable_variable = false;
+}
+
+void AsmJsParser::DeclareGlobal(VarInfo* info, bool mutable_variable,
+ AsmType* type, ValueType vtype,
+ const WasmInitExpr& init) {
+ info->kind = VarKind::kGlobal;
+ info->type = type;
+ info->index = module_builder_->AddGlobal(vtype, false, true, init);
+ info->mutable_variable = mutable_variable;
+}
+
+int32_t AsmJsParser::TempVariable(int i) {
+ if (i + 1 > function_temp_locals_used_) {
+ function_temp_locals_used_ = i + 1;
+ }
+ return function_temp_locals_offset_ + i;
+}
+
+void AsmJsParser::SkipSemicolon() {
+ if (Check(';')) {
+ // Had a semicolon.
+ } else if (!Peek('}') && !scanner_.IsPrecededByNewline()) {
+ FAIL("Expected ;");
+ }
+}
+
+void AsmJsParser::Begin(AsmJsScanner::token_t label) {
+ BareBegin(BlockKind::kRegular, label);
+ current_function_builder_->EmitWithU8(kExprBlock, kLocalVoid);
+}
+
+void AsmJsParser::Loop(AsmJsScanner::token_t label) {
+ BareBegin(BlockKind::kLoop, label);
+ current_function_builder_->EmitWithU8(kExprLoop, kLocalVoid);
+}
+
+void AsmJsParser::End() {
+ BareEnd();
+ current_function_builder_->Emit(kExprEnd);
+}
+
+void AsmJsParser::BareBegin(BlockKind kind, AsmJsScanner::token_t label) {
+ BlockInfo info;
+ info.kind = kind;
+ info.label = label;
+ block_stack_.push_back(info);
+}
+
+void AsmJsParser::BareEnd() {
+ DCHECK(block_stack_.size() > 0);
+ block_stack_.pop_back();
+}
+
+int AsmJsParser::FindContinueLabelDepth(AsmJsScanner::token_t label) {
+ int count = 0;
+ for (auto it = block_stack_.rbegin(); it != block_stack_.rend();
+ ++it, ++count) {
+ if (it->kind == BlockKind::kLoop &&
+ (label == kTokenNone || it->label == label)) {
+ return count;
+ }
+ }
+ return -1;
+}
+
+int AsmJsParser::FindBreakLabelDepth(AsmJsScanner::token_t label) {
+ int count = 0;
+ for (auto it = block_stack_.rbegin(); it != block_stack_.rend();
+ ++it, ++count) {
+ if (it->kind == BlockKind::kRegular &&
+ (label == kTokenNone || it->label == label)) {
+ return count;
+ }
+ }
+ return -1;
+}
+
+// 6.1 ValidateModule
+void AsmJsParser::ValidateModule() {
+ RECURSE(ValidateModuleParameters());
+ EXPECT_TOKEN('{');
+ EXPECT_TOKEN(TOK(UseAsm));
+ SkipSemicolon();
+ RECURSE(ValidateModuleVars());
+ while (Peek(TOK(function))) {
+ RECURSE(ValidateFunction());
+ }
+ while (Peek(TOK(var))) {
+ RECURSE(ValidateFunctionTable());
+ }
+ RECURSE(ValidateExport());
+
+ // Add start function to init things.
+ WasmFunctionBuilder* start = module_builder_->AddFunction();
+ module_builder_->MarkStartFunction(start);
+ for (auto global_import : global_imports_) {
+ if (global_import.needs_init) {
+ start->EmitWithVarInt(kExprGetGlobal, global_import.import_index);
+ start->EmitWithVarInt(kExprSetGlobal,
+ static_cast<uint32_t>(global_import.global_index +
+ global_imports_.size()));
+ }
+ }
+ start->Emit(kExprEnd);
+ FunctionSig::Builder b(zone(), 0, 0);
+ start->SetSignature(b.Build());
+}
+
+// 6.1 ValidateModule - parameters
+void AsmJsParser::ValidateModuleParameters() {
+ EXPECT_TOKEN('(');
+ stdlib_name_ = 0;
+ foreign_name_ = 0;
+ heap_name_ = 0;
+ if (!Peek(')')) {
+ if (!scanner_.IsGlobal()) {
+ FAIL("Expected stdlib parameter");
+ }
+ stdlib_name_ = Consume();
+ if (!Peek(')')) {
+ EXPECT_TOKEN(',');
+ if (!scanner_.IsGlobal()) {
+ FAIL("Expected foreign parameter");
+ }
+ foreign_name_ = Consume();
+ if (!Peek(')')) {
+ EXPECT_TOKEN(',');
+ if (!scanner_.IsGlobal()) {
+ FAIL("Expected heap parameter");
+ }
+ heap_name_ = Consume();
+ }
+ }
+ }
+ EXPECT_TOKEN(')');
+}
+
+// 6.1 ValidateModule - variables
+void AsmJsParser::ValidateModuleVars() {
+ while (Peek(TOK(var)) || Peek(TOK(const))) {
+ bool mutable_variable = true;
+ if (Check(TOK(var))) {
+ // Had a var.
+ } else {
+ EXPECT_TOKEN(TOK(const));
+ mutable_variable = false;
+ }
+ for (;;) {
+ RECURSE(ValidateModuleVar(mutable_variable));
+ if (Check(',')) {
+ continue;
+ }
+ break;
+ }
+ SkipSemicolon();
+ }
+}
+
+// 6.1 ValidateModule - one variable
+void AsmJsParser::ValidateModuleVar(bool mutable_variable) {
+ if (!scanner_.IsGlobal()) {
+ FAIL("Expected identifier");
+ }
+ VarInfo* info = GetVarInfo(Consume());
+ if (info->kind != VarKind::kUnused) {
+ FAIL("Redefinition of variable");
+ }
+ EXPECT_TOKEN('=');
+ double dvalue = 0.0;
+ uint64_t uvalue = 0;
+ if (CheckForDouble(&dvalue)) {
+ DeclareGlobal(info, mutable_variable, AsmType::Double(), kWasmF64,
+ WasmInitExpr(dvalue));
+ } else if (CheckForUnsigned(&uvalue)) {
+ if (uvalue > 0x7fffffff) {
+ FAIL("Numeric literal out of range");
+ }
+ DeclareGlobal(info, mutable_variable, AsmType::Int(), kWasmI32,
+ WasmInitExpr(static_cast<int32_t>(uvalue)));
+ } else if (Check('-')) {
+ if (CheckForDouble(&dvalue)) {
+ DeclareGlobal(info, mutable_variable, AsmType::Double(), kWasmF64,
+ WasmInitExpr(-dvalue));
+ } else if (CheckForUnsigned(&uvalue)) {
+ if (uvalue > 0x7fffffff) {
+ FAIL("Numeric literal out of range");
+ }
+ DeclareGlobal(info, mutable_variable, AsmType::Int(), kWasmI32,
+ WasmInitExpr(-static_cast<int32_t>(uvalue)));
+ } else {
+ FAIL("Expected numeric literal");
+ }
+ } else if (Check(TOK(new))) {
+ RECURSE(ValidateModuleVarNewStdlib(info));
+ } else if (Check(stdlib_name_)) {
+ EXPECT_TOKEN('.');
+ RECURSE(ValidateModuleVarStdlib(info));
+ } else if (ValidateModuleVarImport(info, mutable_variable)) {
+ // Handled inside.
+ } else if (scanner_.IsGlobal()) {
+ RECURSE(ValidateModuleVarFloat(info, mutable_variable));
+ } else {
+ FAIL("Bad variable declaration");
+ }
+}
+
+// 6.1 ValidateModule - global float declaration
+void AsmJsParser::ValidateModuleVarFloat(VarInfo* info, bool mutable_variable) {
+ if (!GetVarInfo(Consume())->type->IsA(stdlib_fround_)) {
+ FAIL("Expected fround");
+ }
+ EXPECT_TOKEN('(');
+ bool negate = false;
+ if (Check('-')) {
+ negate = true;
+ }
+ double dvalue = 0.0;
+ uint64_t uvalue = 0;
+ if (CheckForDouble(&dvalue)) {
+ if (negate) {
+ dvalue = -dvalue;
+ }
+ DeclareGlobal(info, mutable_variable, AsmType::Float(), kWasmF32,
+ WasmInitExpr(static_cast<float>(dvalue)));
+ } else if (CheckForUnsigned(&uvalue)) {
+ dvalue = uvalue;
+ if (negate) {
+ dvalue = -dvalue;
+ }
+ DeclareGlobal(info, mutable_variable, AsmType::Float(), kWasmF32,
+ WasmInitExpr(static_cast<float>(dvalue)));
+ } else {
+ FAIL("Expected numeric literal");
+ }
+ EXPECT_TOKEN(')');
+}
+
+// 6.1 ValidateModule - foreign imports
+bool AsmJsParser::ValidateModuleVarImport(VarInfo* info,
+ bool mutable_variable) {
+ if (Check('+')) {
+ EXPECT_TOKENf(foreign_name_);
+ EXPECT_TOKENf('.');
+ AddGlobalImport(scanner_.GetIdentifierString(), AsmType::Double(), kWasmF64,
+ mutable_variable, info);
+ scanner_.Next();
+ return true;
+ } else if (Check(foreign_name_)) {
+ EXPECT_TOKENf('.');
+ std::string import_name = scanner_.GetIdentifierString();
+ scanner_.Next();
+ if (Check('|')) {
+ if (!CheckForZero()) {
+ FAILf("Expected |0 type annotation for foreign integer import");
+ }
+ AddGlobalImport(import_name, AsmType::Int(), kWasmI32, mutable_variable,
+ info);
+ return true;
+ }
+ info->kind = VarKind::kImportedFunction;
+ function_import_info_.resize(function_import_info_.size() + 1);
+ info->import = &function_import_info_.back();
+ info->import->name = import_name;
+ return true;
+ }
+ return false;
+}
+
+// 6.1 ValidateModule - one variable
+// 9 - Standard Library - heap types
+void AsmJsParser::ValidateModuleVarNewStdlib(VarInfo* info) {
+ EXPECT_TOKEN(stdlib_name_);
+ EXPECT_TOKEN('.');
+ switch (Consume()) {
+#define V(name, _junk1, _junk2, _junk3) \
+ case TOK(name): \
+ info->DeclareStdlibFunc(VarKind::kSpecial, AsmType::name()); \
+ break;
+ STDLIB_ARRAY_TYPE_LIST(V)
+#undef V
+ default:
+ FAIL("Expected ArrayBuffer view");
+ break;
+ }
+ EXPECT_TOKEN('(');
+ EXPECT_TOKEN(heap_name_);
+ EXPECT_TOKEN(')');
+}
+
+// 6.1 ValidateModule - one variable
+// 9 - Standard Library
+void AsmJsParser::ValidateModuleVarStdlib(VarInfo* info) {
+ if (Check(TOK(Math))) {
+ EXPECT_TOKEN('.');
+ switch (Consume()) {
+#define V(name) \
+ case TOK(name): \
+ DeclareGlobal(info, false, AsmType::Double(), kWasmF64, \
+ WasmInitExpr(M_##name)); \
+ break;
+ STDLIB_MATH_VALUE_LIST(V)
+#undef V
+#define V(name, Name, op, sig) \
+ case TOK(name): \
+ info->DeclareStdlibFunc(VarKind::kMath##Name, stdlib_##sig##_); \
+ stdlib_uses_.insert(AsmTyper::kMath##Name); \
+ break;
+ STDLIB_MATH_FUNCTION_LIST(V)
+#undef V
+ default:
+ FAIL("Invalid member of stdlib.Math");
+ }
+ } else if (Check(TOK(Infinity))) {
+ DeclareGlobal(info, false, AsmType::Double(), kWasmF64,
+ WasmInitExpr(std::numeric_limits<double>::infinity()));
+ } else if (Check(TOK(NaN))) {
+ DeclareGlobal(info, false, AsmType::Double(), kWasmF64,
+ WasmInitExpr(std::numeric_limits<double>::quiet_NaN()));
+ } else {
+ FAIL("Invalid member of stdlib");
+ }
+}
+
+// 6.2 ValidateExport
+void AsmJsParser::ValidateExport() {
+ // clang-format off
+ EXPECT_TOKEN(TOK(return));
+ // clang format on
+ if (Check('{')) {
+ for (;;) {
+ std::string name = scanner_.GetIdentifierString();
+ if (!scanner_.IsGlobal() && !scanner_.IsLocal()) {
+ FAIL("Illegal export name");
+ }
+ Consume();
+ EXPECT_TOKEN(':');
+ if (!scanner_.IsGlobal()) {
+ FAIL("Expected function name");
+ }
+ VarInfo* info = GetVarInfo(Consume());
+ if (info->kind != VarKind::kFunction) {
+ FAIL("Expected function");
+ }
+ info->function_builder->ExportAs(
+ {name.c_str(), static_cast<int>(name.size())});
+ if (Check(',')) {
+ if (!Peek('}')) {
+ continue;
+ }
+ }
+ break;
+ }
+ EXPECT_TOKEN('}');
+ } else {
+ if (!scanner_.IsGlobal()) {
+ FAIL("Single function export must be a function name");
+ }
+ VarInfo* info = GetVarInfo(Consume());
+ if (info->kind != VarKind::kFunction) {
+ FAIL("Single function export must be a function");
+ }
+ const char* single_function_name = "__single_function__";
+ info->function_builder->ExportAs(CStrVector(single_function_name));
+ }
+}
+
+// 6.3 ValidateFunctionTable
+void AsmJsParser::ValidateFunctionTable() {
+ EXPECT_TOKEN(TOK(var));
+ if (!scanner_.IsGlobal()) {
+ FAIL("Expected table name");
+ }
+ VarInfo* table_info = GetVarInfo(Consume());
+ // TODO(bradnelson): Check for double use of export name.
+ EXPECT_TOKEN('=');
+ EXPECT_TOKEN('[');
+ uint64_t count = 0;
+ for (;;) {
+ if (!scanner_.IsGlobal()) {
+ FAIL("Expected function name");
+ }
+ VarInfo* info = GetVarInfo(Consume());
+ if (info->kind != VarKind::kFunction) {
+ FAIL("Expected function");
+ }
+ if (table_info->kind == VarKind::kTable) {
+ DCHECK_GE(table_info->mask, 0);
+ if (count >= static_cast<uint64_t>(table_info->mask) + 1) {
+ FAIL("Exceeded function table size");
+ }
+ // Only store the function into a table if we used the table somewhere
+ // (i.e. tables are first seen at their use sites and allocated there).
+ module_builder_->SetIndirectFunction(
+ static_cast<uint32_t>(table_info->index + count), info->index);
+ }
+ ++count;
+ if (Check(',')) {
+ if (!Peek(']')) {
+ continue;
+ }
+ }
+ break;
+ }
+ EXPECT_TOKEN(']');
+ if (table_info->kind == VarKind::kTable &&
+ count != static_cast<uint64_t>(table_info->mask) + 1) {
+ FAIL("Function table size does not match uses");
+ }
+ SkipSemicolon();
+}
+
+// 6.4 ValidateFunction
+void AsmJsParser::ValidateFunction() {
+ int start_position = scanner_.GetPosition();
+ EXPECT_TOKEN(TOK(function));
+ if (!scanner_.IsGlobal()) {
+ FAIL("Expected function name");
+ }
+
+ std::string function_name_raw = scanner_.GetIdentifierString();
+ AsmJsScanner::token_t function_name = Consume();
+ VarInfo* function_info = GetVarInfo(function_name);
+ if (function_info->kind == VarKind::kUnused) {
+ function_info->kind = VarKind::kFunction;
+ function_info->function_builder = module_builder_->AddFunction();
+ function_info->function_builder->SetName(
+ {function_name_raw.c_str(),
+ static_cast<int>(function_name_raw.size())});
+ function_info->index = function_info->function_builder->func_index();
+ function_info->function_defined = true;
+ } else if (function_info->function_defined) {
+ FAIL("Function redefined");
+ }
+ current_function_builder_ = function_info->function_builder;
+ return_type_ = nullptr;
+
+ // Record start of the function, used as position for the stack check.
+ current_function_builder_->SetAsmFunctionStartPosition(start_position);
+
+ std::vector<AsmType*> params;
+ ValidateFunctionParams(&params);
+ std::vector<ValueType> locals;
+ ValidateFunctionLocals(params.size(), &locals);
+
+ function_temp_locals_offset_ = static_cast<uint32_t>(
+ params.size() + locals.size());
+ function_temp_locals_used_ = 0;
+
+ while (!failed_ && !Peek('}')) {
+ RECURSE(ValidateStatement());
+ }
+ EXPECT_TOKEN('}');
+
+ if (return_type_ == nullptr) {
+ return_type_ = AsmType::Void();
+ }
+
+ // TODO(bradnelson): WasmModuleBuilder can't take this in the right order.
+ // We should fix that so we can use it instead.
+ FunctionSig* sig = ConvertSignature(return_type_, params);
+ if (sig == nullptr) {
+ FAIL("Invalid function signature in declaration");
+ }
+ current_function_builder_->SetSignature(sig);
+ for (auto local : locals) {
+ current_function_builder_->AddLocal(local);
+ }
+ // Add bonus temps.
+ for (int i = 0; i < function_temp_locals_used_; ++i) {
+ current_function_builder_->AddLocal(kWasmI32);
+ }
+
+ // End function
+ current_function_builder_->Emit(kExprEnd);
+
+ // Add in function type.
+ AsmType* function_type = AsmType::Function(zone(), return_type_);
+ for (auto t : params) {
+ function_type->AsFunctionType()->AddArgument(t);
+ }
+ function_info = GetVarInfo(function_name);
+ if (function_info->kind == VarKind::kUnused) {
+ function_info->kind = VarKind::kFunction;
+ function_info->index = current_function_builder_->func_index();
+ function_info->type = function_type;
+ } else {
+ if (function_info->kind != VarKind::kFunction) {
+ FAIL("Function name collides with variable");
+ }
+ // TODO(bradnelson): Should IsExactly be used here?
+ if (!function_info->type->IsA(AsmType::None()) &&
+ !function_type->IsA(function_info->type)) {
+ FAIL("Function definition doesn't match use");
+ }
+ }
+
+ scanner_.ResetLocals();
+ local_var_info_.clear();
+}
+
+// 6.4 ValidateFunction
+void AsmJsParser::ValidateFunctionParams(std::vector<AsmType*>* params) {
+ // TODO(bradnelson): Do this differently so that the scanner doesn't need to
+ // have a state transition that needs knowledge of how the scanner works
+ // inside.
+ scanner_.EnterLocalScope();
+ EXPECT_TOKEN('(');
+ std::vector<AsmJsScanner::token_t> function_parameters;
+ while (!failed_ && !Peek(')')) {
+ if (!scanner_.IsLocal()) {
+ FAIL("Expected parameter name");
+ }
+ function_parameters.push_back(Consume());
+ if (!Peek(')')) {
+ EXPECT_TOKEN(',');
+ }
+ }
+ EXPECT_TOKEN(')');
+ scanner_.EnterGlobalScope();
+ EXPECT_TOKEN('{');
+ // 5.1 Parameter Type Annotations
+ for (auto p : function_parameters) {
+ EXPECT_TOKEN(p);
+ EXPECT_TOKEN('=');
+ VarInfo* info = GetVarInfo(p);
+ if (info->kind != VarKind::kUnused) {
+ FAIL("Duplicate parameter name");
+ }
+ if (Check(p)) {
+ EXPECT_TOKEN('|');
+ if (!CheckForZero()) {
+ FAIL("Bad integer parameter annotation.");
+ }
+ info->kind = VarKind::kLocal;
+ info->type = AsmType::Int();
+ info->index = static_cast<uint32_t>(params->size());
+ params->push_back(AsmType::Int());
+ } else if (Check('+')) {
+ EXPECT_TOKEN(p);
+ info->kind = VarKind::kLocal;
+ info->type = AsmType::Double();
+ info->index = static_cast<uint32_t>(params->size());
+ params->push_back(AsmType::Double());
+ } else {
+ if (!GetVarInfo(Consume())->type->IsA(stdlib_fround_)) {
+ FAIL("Expected fround");
+ }
+ EXPECT_TOKEN('(');
+ EXPECT_TOKEN(p);
+ EXPECT_TOKEN(')');
+ info->kind = VarKind::kLocal;
+ info->type = AsmType::Float();
+ info->index = static_cast<uint32_t>(params->size());
+ params->push_back(AsmType::Float());
+ }
+ SkipSemicolon();
+ }
+}
+
+// 6.4 ValidateFunction - locals
+void AsmJsParser::ValidateFunctionLocals(
+ size_t param_count, std::vector<ValueType>* locals) {
+ // Local Variables.
+ while (Peek(TOK(var))) {
+ scanner_.EnterLocalScope();
+ EXPECT_TOKEN(TOK(var));
+ scanner_.EnterGlobalScope();
+ for (;;) {
+ if (!scanner_.IsLocal()) {
+ FAIL("Expected local variable identifier");
+ }
+ VarInfo* info = GetVarInfo(Consume());
+ if (info->kind != VarKind::kUnused) {
+ FAIL("Duplicate local variable name");
+ }
+ // Store types.
+ EXPECT_TOKEN('=');
+ double dvalue = 0.0;
+ uint64_t uvalue = 0;
+ if (Check('-')) {
+ if (CheckForDouble(&dvalue)) {
+ info->kind = VarKind::kLocal;
+ info->type = AsmType::Double();
+ info->index = static_cast<uint32_t>(param_count + locals->size());
+ locals->push_back(kWasmF64);
+ byte code[] = {WASM_F64(dvalue)};
+ current_function_builder_->EmitCode(code, sizeof(code));
+ current_function_builder_->EmitSetLocal(info->index);
+ } else if (CheckForUnsigned(&uvalue)) {
+ if (uvalue > 0x7fffffff) {
+ FAIL("Numeric literal out of range");
+ }
+ info->kind = VarKind::kLocal;
+ info->type = AsmType::Int();
+ info->index = static_cast<uint32_t>(param_count + locals->size());
+ locals->push_back(kWasmI32);
+ int32_t value = -static_cast<int32_t>(uvalue);
+ current_function_builder_->EmitI32Const(value);
+ current_function_builder_->EmitSetLocal(info->index);
+ } else {
+ FAIL("Expected variable initial value");
+ }
+ } else if (scanner_.IsGlobal()) {
+ VarInfo* sinfo = GetVarInfo(Consume());
+ if (sinfo->kind == VarKind::kGlobal) {
+ if (sinfo->mutable_variable) {
+ FAIL("Initializing from global requires const variable");
+ }
+ info->kind = VarKind::kLocal;
+ info->type = sinfo->type;
+ info->index = static_cast<uint32_t>(param_count + locals->size());
+ if (sinfo->type->IsA(AsmType::Int())) {
+ locals->push_back(kWasmI32);
+ } else if (sinfo->type->IsA(AsmType::Float())) {
+ locals->push_back(kWasmF32);
+ } else if (sinfo->type->IsA(AsmType::Double())) {
+ locals->push_back(kWasmF64);
+ } else {
+ FAIL("Bad local variable definition");
+ }
+ current_function_builder_->EmitWithVarInt(kExprGetGlobal,
+ VarIndex(sinfo));
+ current_function_builder_->EmitSetLocal(info->index);
+ } else if (sinfo->type->IsA(stdlib_fround_)) {
+ EXPECT_TOKEN('(');
+ bool negate = false;
+ if (Check('-')) {
+ negate = true;
+ }
+ double dvalue = 0.0;
+ if (CheckForDouble(&dvalue)) {
+ info->kind = VarKind::kLocal;
+ info->type = AsmType::Float();
+ info->index = static_cast<uint32_t>(param_count + locals->size());
+ locals->push_back(kWasmF32);
+ if (negate) {
+ dvalue = -dvalue;
+ }
+ byte code[] = {WASM_F32(dvalue)};
+ current_function_builder_->EmitCode(code, sizeof(code));
+ current_function_builder_->EmitSetLocal(info->index);
+ } else if (CheckForUnsigned(&uvalue)) {
+ if (uvalue > 0x7fffffff) {
+ FAIL("Numeric literal out of range");
+ }
+ info->kind = VarKind::kLocal;
+ info->type = AsmType::Float();
+ info->index = static_cast<uint32_t>(param_count + locals->size());
+ locals->push_back(kWasmF32);
+ int32_t value = static_cast<int32_t>(uvalue);
+ if (negate) {
+ value = -value;
+ }
+ double fvalue = static_cast<double>(value);
+ byte code[] = {WASM_F32(fvalue)};
+ current_function_builder_->EmitCode(code, sizeof(code));
+ current_function_builder_->EmitSetLocal(info->index);
+ } else {
+ FAIL("Expected variable initial value");
+ }
+ EXPECT_TOKEN(')');
+ } else {
+ FAIL("expected fround or const global");
+ }
+ } else if (CheckForDouble(&dvalue)) {
+ info->kind = VarKind::kLocal;
+ info->type = AsmType::Double();
+ info->index = static_cast<uint32_t>(param_count + locals->size());
+ locals->push_back(kWasmF64);
+ byte code[] = {WASM_F64(dvalue)};
+ current_function_builder_->EmitCode(code, sizeof(code));
+ current_function_builder_->EmitSetLocal(info->index);
+ } else if (CheckForUnsigned(&uvalue)) {
+ info->kind = VarKind::kLocal;
+ info->type = AsmType::Int();
+ info->index = static_cast<uint32_t>(param_count + locals->size());
+ locals->push_back(kWasmI32);
+ int32_t value = static_cast<int32_t>(uvalue);
+ current_function_builder_->EmitI32Const(value);
+ current_function_builder_->EmitSetLocal(info->index);
+ } else {
+ FAIL("Expected variable initial value");
+ }
+ if (!Peek(',')) {
+ break;
+ }
+ scanner_.EnterLocalScope();
+ EXPECT_TOKEN(',');
+ scanner_.EnterGlobalScope();
+ }
+ SkipSemicolon();
+ }
+}
+
+// ValidateStatement
+void AsmJsParser::ValidateStatement() {
+ call_coercion_ = nullptr;
+ if (Peek('{')) {
+ RECURSE(Block());
+ } else if (Peek(';')) {
+ RECURSE(EmptyStatement());
+ } else if (Peek(TOK(if))) {
+ RECURSE(IfStatement());
+ // clang-format off
+ } else if (Peek(TOK(return))) {
+ // clang-format on
+ RECURSE(ReturnStatement());
+ } else if (IterationStatement()) {
+ // Handled in IterationStatement.
+ } else if (Peek(TOK(break))) {
+ RECURSE(BreakStatement());
+ } else if (Peek(TOK(continue))) {
+ RECURSE(ContinueStatement());
+ } else if (Peek(TOK(switch))) {
+ RECURSE(SwitchStatement());
+ } else {
+ RECURSE(ExpressionStatement());
+ }
+}
+
+// 6.5.1 Block
+void AsmJsParser::Block() {
+ bool can_break_to_block = pending_label_ != 0;
+ if (can_break_to_block) {
+ Begin(pending_label_);
+ }
+ pending_label_ = 0;
+ EXPECT_TOKEN('{');
+ while (!failed_ && !Peek('}')) {
+ RECURSE(ValidateStatement());
+ }
+ EXPECT_TOKEN('}');
+ if (can_break_to_block) {
+ End();
+ }
+}
+
+// 6.5.2 ExpressionStatement
+void AsmJsParser::ExpressionStatement() {
+ if (scanner_.IsGlobal() || scanner_.IsLocal()) {
+ // NOTE: Both global or local identifiers can also be used as labels.
+ scanner_.Next();
+ if (Peek(':')) {
+ scanner_.Rewind();
+ RECURSE(LabelledStatement());
+ return;
+ }
+ scanner_.Rewind();
+ }
+ AsmType* ret;
+ RECURSE(ret = ValidateExpression());
+ if (!ret->IsA(AsmType::Void())) {
+ current_function_builder_->Emit(kExprDrop);
+ }
+ SkipSemicolon();
+}
+
+// 6.5.3 EmptyStatement
+void AsmJsParser::EmptyStatement() { EXPECT_TOKEN(';'); }
+
+// 6.5.4 IfStatement
+void AsmJsParser::IfStatement() {
+ EXPECT_TOKEN(TOK(if));
+ EXPECT_TOKEN('(');
+ RECURSE(Expression(AsmType::Int()));
+ EXPECT_TOKEN(')');
+ current_function_builder_->EmitWithU8(kExprIf, kLocalVoid);
+ BareBegin();
+ RECURSE(ValidateStatement());
+ if (Check(TOK(else))) {
+ current_function_builder_->Emit(kExprElse);
+ RECURSE(ValidateStatement());
+ }
+ current_function_builder_->Emit(kExprEnd);
+ BareEnd();
+}
+
+// 6.5.5 ReturnStatement
+void AsmJsParser::ReturnStatement() {
+ // clang-format off
+ EXPECT_TOKEN(TOK(return ));
+ // clang-format on
+ if (!Peek(';') && !Peek('}')) {
+ // TODO(bradnelson): See if this can be factored out.
+ AsmType* ret;
+ RECURSE(ret = Expression(return_type_));
+ if (ret->IsA(AsmType::Double())) {
+ return_type_ = AsmType::Double();
+ } else if (ret->IsA(AsmType::Float())) {
+ return_type_ = AsmType::Float();
+ } else if (ret->IsA(AsmType::Signed())) {
+ return_type_ = AsmType::Signed();
+ } else {
+ FAIL("Invalid return type");
+ }
+ } else {
+ return_type_ = AsmType::Void();
+ }
+ current_function_builder_->Emit(kExprReturn);
+ SkipSemicolon();
+}
+
+// 6.5.6 IterationStatement
+bool AsmJsParser::IterationStatement() {
+ if (Peek(TOK(while))) {
+ WhileStatement();
+ } else if (Peek(TOK(do))) {
+ DoStatement();
+ } else if (Peek(TOK(for))) {
+ ForStatement();
+ } else {
+ return false;
+ }
+ return true;
+}
+
+// 6.5.6 IterationStatement - while
+void AsmJsParser::WhileStatement() {
+ // a: block {
+ Begin(pending_label_);
+ // b: loop {
+ Loop(pending_label_);
+ pending_label_ = 0;
+ EXPECT_TOKEN(TOK(while));
+ EXPECT_TOKEN('(');
+ RECURSE(Expression(AsmType::Int()));
+ EXPECT_TOKEN(')');
+ // if (!CONDITION) break a;
+ current_function_builder_->Emit(kExprI32Eqz);
+ current_function_builder_->EmitWithU8(kExprBrIf, 1);
+ // BODY
+ RECURSE(ValidateStatement());
+ // continue b;
+ current_function_builder_->EmitWithU8(kExprBr, 0);
+ End();
+ // }
+ // }
+ End();
+}
+
+// 6.5.6 IterationStatement - do
+void AsmJsParser::DoStatement() {
+ // a: block {
+ Begin(pending_label_);
+ // b: loop {
+ Loop();
+ // c: block { // but treated like loop so continue works
+ BareBegin(BlockKind::kLoop, pending_label_);
+ current_function_builder_->EmitWithU8(kExprBlock, kLocalVoid);
+ pending_label_ = 0;
+ EXPECT_TOKEN(TOK(do));
+ // BODY
+ RECURSE(ValidateStatement());
+ EXPECT_TOKEN(TOK(while));
+ End();
+ // }
+ EXPECT_TOKEN('(');
+ RECURSE(Expression(AsmType::Int()));
+ // if (CONDITION) break a;
+ current_function_builder_->Emit(kExprI32Eqz);
+ current_function_builder_->EmitWithU8(kExprBrIf, 1);
+ // continue b;
+ current_function_builder_->EmitWithU8(kExprBr, 0);
+ EXPECT_TOKEN(')');
+ // }
+ End();
+ // }
+ End();
+ SkipSemicolon();
+}
+
+// 6.5.6 IterationStatement - for
+void AsmJsParser::ForStatement() {
+ EXPECT_TOKEN(TOK(for));
+ EXPECT_TOKEN('(');
+ if (!Peek(';')) {
+ Expression(nullptr);
+ }
+ EXPECT_TOKEN(';');
+ // a: block {
+ Begin(pending_label_);
+ // b: loop {
+ Loop(pending_label_);
+ pending_label_ = 0;
+ if (!Peek(';')) {
+ // if (CONDITION) break a;
+ RECURSE(Expression(AsmType::Int()));
+ current_function_builder_->Emit(kExprI32Eqz);
+ current_function_builder_->EmitWithU8(kExprBrIf, 1);
+ }
+ EXPECT_TOKEN(';');
+ // Stash away INCREMENT
+ size_t increment_position = current_function_builder_->GetPosition();
+ if (!Peek(')')) {
+ RECURSE(Expression(nullptr));
+ }
+ std::vector<byte> increment_code;
+ current_function_builder_->StashCode(&increment_code, increment_position);
+ EXPECT_TOKEN(')');
+ // BODY
+ RECURSE(ValidateStatement());
+ // INCREMENT
+ current_function_builder_->EmitCode(
+ increment_code.data(), static_cast<uint32_t>(increment_code.size()));
+ current_function_builder_->EmitWithU8(kExprBr, 0);
+ // }
+ End();
+ // }
+ End();
+}
+
+// 6.5.7 BreakStatement
+void AsmJsParser::BreakStatement() {
+ EXPECT_TOKEN(TOK(break));
+ AsmJsScanner::token_t label_name = kTokenNone;
+ if (scanner_.IsGlobal() || scanner_.IsLocal()) {
+ // NOTE: Currently using globals/locals for labels too.
+ label_name = Consume();
+ }
+ int depth = FindBreakLabelDepth(label_name);
+ if (depth < 0) {
+ FAIL("Illegal break");
+ }
+ current_function_builder_->Emit(kExprBr);
+ current_function_builder_->EmitVarInt(depth);
+ SkipSemicolon();
+}
+
+// 6.5.8 ContinueStatement
+void AsmJsParser::ContinueStatement() {
+ EXPECT_TOKEN(TOK(continue));
+ AsmJsScanner::token_t label_name = kTokenNone;
+ if (scanner_.IsGlobal() || scanner_.IsLocal()) {
+ // NOTE: Currently using globals/locals for labels too.
+ label_name = Consume();
+ }
+ int depth = FindContinueLabelDepth(label_name);
+ if (depth < 0) {
+ FAIL("Illegal continue");
+ }
+ current_function_builder_->Emit(kExprBr);
+ current_function_builder_->EmitVarInt(depth);
+ SkipSemicolon();
+}
+
+// 6.5.9 LabelledStatement
+void AsmJsParser::LabelledStatement() {
+ DCHECK(scanner_.IsGlobal() || scanner_.IsLocal());
+ // NOTE: Currently using globals/locals for labels too.
+ if (pending_label_ != 0) {
+ FAIL("Double label unsupported");
+ }
+ pending_label_ = scanner_.Token();
+ scanner_.Next();
+ EXPECT_TOKEN(':');
+ RECURSE(ValidateStatement());
+}
+
+// 6.5.10 SwitchStatement
+void AsmJsParser::SwitchStatement() {
+ EXPECT_TOKEN(TOK(switch));
+ EXPECT_TOKEN('(');
+ AsmType* test;
+ RECURSE(test = Expression(nullptr));
+ if (!test->IsA(AsmType::Signed())) {
+ FAIL("Expected signed for switch value");
+ }
+ EXPECT_TOKEN(')');
+ int32_t tmp = TempVariable(0);
+ current_function_builder_->EmitSetLocal(tmp);
+ Begin(pending_label_);
+ pending_label_ = 0;
+ // TODO(bradnelson): Make less weird.
+ std::vector<int32_t> cases;
+ GatherCases(&cases); // Skips { implicitly.
+ size_t count = cases.size() + 1;
+ for (size_t i = 0; i < count; ++i) {
+ BareBegin(BlockKind::kOther);
+ current_function_builder_->EmitWithU8(kExprBlock, kLocalVoid);
+ }
+ int table_pos = 0;
+ for (auto c : cases) {
+ current_function_builder_->EmitGetLocal(tmp);
+ current_function_builder_->EmitI32Const(c);
+ current_function_builder_->Emit(kExprI32Eq);
+ current_function_builder_->EmitWithVarInt(kExprBrIf, table_pos++);
+ }
+ current_function_builder_->EmitWithVarInt(kExprBr, table_pos++);
+ while (!failed_ && Peek(TOK(case))) {
+ current_function_builder_->Emit(kExprEnd);
+ BareEnd();
+ RECURSE(ValidateCase());
+ }
+ current_function_builder_->Emit(kExprEnd);
+ BareEnd();
+ if (Peek(TOK(default))) {
+ RECURSE(ValidateDefault());
+ }
+ EXPECT_TOKEN('}');
+ End();
+}
+
+// 6.6. ValidateCase
+void AsmJsParser::ValidateCase() {
+ EXPECT_TOKEN(TOK(case));
+ bool negate = false;
+ if (Check('-')) {
+ negate = true;
+ }
+ uint64_t uvalue;
+ if (!CheckForUnsigned(&uvalue)) {
+ FAIL("Expected numeric literal");
+ }
+ // TODO(bradnelson): Share negation plumbing.
+ if ((negate && uvalue > 0x80000000) || (!negate && uvalue > 0x7fffffff)) {
+ FAIL("Numeric literal out of range");
+ }
+ int32_t value = static_cast<int32_t>(uvalue);
+ if (negate) {
+ value = -value;
+ }
+ EXPECT_TOKEN(':');
+ while (!failed_ && !Peek('}') && !Peek(TOK(case)) && !Peek(TOK(default))) {
+ RECURSE(ValidateStatement());
+ }
+}
+
+// 6.7 ValidateDefault
+void AsmJsParser::ValidateDefault() {
+ EXPECT_TOKEN(TOK(default));
+ EXPECT_TOKEN(':');
+ while (!failed_ && !Peek('}')) {
+ RECURSE(ValidateStatement());
+ }
+}
+
+// 6.8 ValidateExpression
+AsmType* AsmJsParser::ValidateExpression() {
+ AsmType* ret;
+ RECURSEn(ret = Expression(nullptr));
+ return ret;
+}
+
+// 6.8.1 Expression
+AsmType* AsmJsParser::Expression(AsmType* expected) {
+ AsmType* a;
+ for (;;) {
+ RECURSEn(a = AssignmentExpression());
+ if (Peek(',')) {
+ if (a->IsA(AsmType::None())) {
+ FAILn("Expected actual type");
+ }
+ if (!a->IsA(AsmType::Void())) {
+ current_function_builder_->Emit(kExprDrop);
+ }
+ EXPECT_TOKENn(',');
+ continue;
+ }
+ break;
+ }
+ if (expected != nullptr && !a->IsA(expected)) {
+ FAILn("Unexpected type");
+ }
+ return a;
+}
+
+// 6.8.2 NumericLiteral
+AsmType* AsmJsParser::NumericLiteral() {
+ call_coercion_ = nullptr;
+ double dvalue = 0.0;
+ uint64_t uvalue = 0;
+ if (CheckForDouble(&dvalue)) {
+ byte code[] = {WASM_F64(dvalue)};
+ current_function_builder_->EmitCode(code, sizeof(code));
+ return AsmType::Double();
+ } else if (CheckForUnsigned(&uvalue)) {
+ if (uvalue <= 0x7fffffff) {
+ current_function_builder_->EmitI32Const(static_cast<int32_t>(uvalue));
+ return AsmType::FixNum();
+ } else if (uvalue <= 0xffffffff) {
+ current_function_builder_->EmitI32Const(static_cast<int32_t>(uvalue));
+ return AsmType::Unsigned();
+ } else {
+ FAILn("Integer numeric literal out of range.");
+ }
+ } else {
+ FAILn("Expected numeric literal.");
+ }
+}
+
+// 6.8.3 Identifier
+AsmType* AsmJsParser::Identifier() {
+ call_coercion_ = nullptr;
+ if (scanner_.IsLocal()) {
+ VarInfo* info = GetVarInfo(Consume());
+ if (info->kind != VarKind::kLocal) {
+ FAILn("Undefined local variable");
+ }
+ current_function_builder_->EmitGetLocal(info->index);
+ return info->type;
+ } else if (scanner_.IsGlobal()) {
+ VarInfo* info = GetVarInfo(Consume());
+ if (info->kind != VarKind::kGlobal) {
+ FAILn("Undefined global variable");
+ }
+ current_function_builder_->EmitWithVarInt(kExprGetGlobal, VarIndex(info));
+ return info->type;
+ }
+ UNREACHABLE();
+ return nullptr;
+}
+
+// 6.8.4 CallExpression
+AsmType* AsmJsParser::CallExpression() {
+ AsmType* ret;
+ if (scanner_.IsGlobal() &&
+ GetVarInfo(scanner_.Token())->type->IsA(stdlib_fround_)) {
+ ValidateFloatCoercion();
+ return AsmType::Float();
+ } else if (scanner_.IsGlobal() &&
+ GetVarInfo(scanner_.Token())->type->IsA(AsmType::Heap())) {
+ RECURSEn(ret = MemberExpression());
+ } else if (Peek('(')) {
+ RECURSEn(ret = ParenthesizedExpression());
+ } else if (PeekCall()) {
+ RECURSEn(ret = ValidateCall());
+ } else if (scanner_.IsLocal() || scanner_.IsGlobal()) {
+ RECURSEn(ret = Identifier());
+ } else {
+ RECURSEn(ret = NumericLiteral());
+ }
+ return ret;
+}
+
+// 6.8.5 MemberExpression
+AsmType* AsmJsParser::MemberExpression() {
+ call_coercion_ = nullptr;
+ ValidateHeapAccess();
+ if (Peek('=')) {
+ inside_heap_assignment_ = true;
+ return heap_access_type_->StoreType();
+ } else {
+#define V(array_type, wasmload, wasmstore, type) \
+ if (heap_access_type_->IsA(AsmType::array_type())) { \
+ current_function_builder_->Emit(kExpr##type##AsmjsLoad##wasmload); \
+ return heap_access_type_->LoadType(); \
+ }
+ STDLIB_ARRAY_TYPE_LIST(V)
+#undef V
+ FAILn("Expected valid heap load");
+ }
+}
+
+// 6.8.6 AssignmentExpression
+AsmType* AsmJsParser::AssignmentExpression() {
+ AsmType* ret;
+ if (scanner_.IsGlobal() &&
+ GetVarInfo(scanner_.Token())->type->IsA(AsmType::Heap())) {
+ RECURSEn(ret = ConditionalExpression());
+ if (Peek('=')) {
+ if (!inside_heap_assignment_) {
+ FAILn("Invalid assignment target");
+ }
+ inside_heap_assignment_ = false;
+ AsmType* heap_type = heap_access_type_;
+ EXPECT_TOKENn('=');
+ AsmType* value;
+ RECURSEn(value = AssignmentExpression());
+ if (!value->IsA(ret)) {
+ FAILn("Illegal type stored to heap view");
+ }
+ if (heap_type->IsA(AsmType::Float32Array()) &&
+ value->IsA(AsmType::Double())) {
+ // Assignment to a float32 heap can be used to convert doubles.
+ current_function_builder_->Emit(kExprF32ConvertF64);
+ }
+ ret = value;
+#define V(array_type, wasmload, wasmstore, type) \
+ if (heap_type->IsA(AsmType::array_type())) { \
+ current_function_builder_->Emit(kExpr##type##AsmjsStore##wasmstore); \
+ return ret; \
+ }
+ STDLIB_ARRAY_TYPE_LIST(V)
+#undef V
+ }
+ } else if (scanner_.IsLocal() || scanner_.IsGlobal()) {
+ bool is_local = scanner_.IsLocal();
+ VarInfo* info = GetVarInfo(scanner_.Token());
+ USE(is_local);
+ ret = info->type;
+ scanner_.Next();
+ if (Check('=')) {
+ // NOTE: Before this point, this might have been VarKind::kUndefined,
+ // as it might be a label.
+ DCHECK(is_local ? info->kind == VarKind::kLocal
+ : info->kind == VarKind::kGlobal);
+ AsmType* value;
+ RECURSEn(value = AssignmentExpression());
+ if (!value->IsA(ret)) {
+ FAILn("Type mismatch in assignment");
+ }
+ if (info->kind == VarKind::kLocal) {
+ current_function_builder_->EmitTeeLocal(info->index);
+ } else if (info->kind == VarKind::kGlobal) {
+ current_function_builder_->EmitWithVarUint(kExprSetGlobal,
+ VarIndex(info));
+ current_function_builder_->EmitWithVarUint(kExprGetGlobal,
+ VarIndex(info));
+ } else {
+ UNREACHABLE();
+ }
+ return ret;
+ }
+ scanner_.Rewind();
+ RECURSEn(ret = ConditionalExpression());
+ } else {
+ RECURSEn(ret = ConditionalExpression());
+ }
+ return ret;
+}
+
+// 6.8.7 UnaryExpression
+AsmType* AsmJsParser::UnaryExpression() {
+ AsmType* ret;
+ if (Check('-')) {
+ uint64_t uvalue;
+ if (CheckForUnsigned(&uvalue)) {
+ // TODO(bradnelson): was supposed to be 0x7fffffff, check errata.
+ if (uvalue <= 0x80000000) {
+ current_function_builder_->EmitI32Const(-static_cast<int32_t>(uvalue));
+ } else {
+ FAILn("Integer numeric literal out of range.");
+ }
+ ret = AsmType::Signed();
+ } else {
+ RECURSEn(ret = UnaryExpression());
+ if (ret->IsA(AsmType::Int())) {
+ int32_t tmp = TempVariable(0);
+ current_function_builder_->EmitSetLocal(tmp);
+ current_function_builder_->EmitI32Const(0);
+ current_function_builder_->EmitGetLocal(tmp);
+ current_function_builder_->Emit(kExprI32Sub);
+ ret = AsmType::Intish();
+ } else if (ret->IsA(AsmType::DoubleQ())) {
+ current_function_builder_->Emit(kExprF64Neg);
+ ret = AsmType::Double();
+ } else if (ret->IsA(AsmType::FloatQ())) {
+ current_function_builder_->Emit(kExprF32Neg);
+ ret = AsmType::Floatish();
+ } else {
+ FAILn("expected int/double?/float?");
+ }
+ }
+ } else if (Check('+')) {
+ call_coercion_ = AsmType::Double();
+ RECURSEn(ret = UnaryExpression());
+ // TODO(bradnelson): Generalize.
+ if (ret->IsA(AsmType::Signed())) {
+ current_function_builder_->Emit(kExprF64SConvertI32);
+ ret = AsmType::Double();
+ } else if (ret->IsA(AsmType::Unsigned())) {
+ current_function_builder_->Emit(kExprF64UConvertI32);
+ ret = AsmType::Double();
+ } else if (ret->IsA(AsmType::DoubleQ())) {
+ ret = AsmType::Double();
+ } else if (ret->IsA(AsmType::FloatQ())) {
+ current_function_builder_->Emit(kExprF64ConvertF32);
+ ret = AsmType::Double();
+ } else {
+ FAILn("expected signed/unsigned/double?/float?");
+ }
+ } else if (Check('!')) {
+ RECURSEn(ret = UnaryExpression());
+ if (!ret->IsA(AsmType::Int())) {
+ FAILn("expected int");
+ }
+ current_function_builder_->Emit(kExprI32Eqz);
+ } else if (Check('~')) {
+ if (Check('~')) {
+ RECURSEn(ret = UnaryExpression());
+ if (ret->IsA(AsmType::Double())) {
+ current_function_builder_->Emit(kExprI32AsmjsSConvertF64);
+ } else if (ret->IsA(AsmType::FloatQ())) {
+ current_function_builder_->Emit(kExprI32AsmjsSConvertF32);
+ } else {
+ FAILn("expected double or float?");
+ }
+ ret = AsmType::Signed();
+ } else {
+ RECURSEn(ret = UnaryExpression());
+ if (!ret->IsA(AsmType::Intish())) {
+ FAILn("operator ~ expects intish");
+ }
+ current_function_builder_->EmitI32Const(0xffffffff);
+ current_function_builder_->Emit(kExprI32Xor);
+ ret = AsmType::Signed();
+ }
+ } else {
+ RECURSEn(ret = CallExpression());
+ }
+ return ret;
+}
+
+// 6.8.8 MultaplicativeExpression
+AsmType* AsmJsParser::MultiplicativeExpression() {
+ uint64_t uvalue;
+ if (CheckForUnsignedBelow(0x100000, &uvalue)) {
+ if (Check('*')) {
+ AsmType* a;
+ RECURSEn(a = UnaryExpression());
+ if (!a->IsA(AsmType::Int())) {
+ FAILn("Expected int");
+ }
+ current_function_builder_->EmitI32Const(static_cast<int32_t>(uvalue));
+ current_function_builder_->Emit(kExprI32Mul);
+ return AsmType::Intish();
+ }
+ scanner_.Rewind();
+ } else if (Check('-')) {
+ if (CheckForUnsignedBelow(0x100000, &uvalue)) {
+ current_function_builder_->EmitI32Const(-static_cast<int32_t>(uvalue));
+ if (Check('*')) {
+ AsmType* a;
+ RECURSEn(a = UnaryExpression());
+ if (!a->IsA(AsmType::Int())) {
+ FAILn("Expected int");
+ }
+ current_function_builder_->Emit(kExprI32Mul);
+ return AsmType::Intish();
+ }
+ return AsmType::Signed();
+ }
+ scanner_.Rewind();
+ }
+ AsmType* a;
+ RECURSEn(a = UnaryExpression());
+ for (;;) {
+ if (Check('*')) {
+ uint64_t uvalue;
+ if (Check('-')) {
+ if (CheckForUnsigned(&uvalue)) {
+ if (uvalue >= 0x100000) {
+ FAILn("Constant multiple out of range");
+ }
+ if (!a->IsA(AsmType::Int())) {
+ FAILn("Integer multiply of expects int");
+ }
+ current_function_builder_->EmitI32Const(static_cast<int32_t>(uvalue));
+ current_function_builder_->Emit(kExprI32Mul);
+ return AsmType::Intish();
+ }
+ scanner_.Rewind();
+ } else if (CheckForUnsigned(&uvalue)) {
+ if (uvalue >= 0x100000) {
+ FAILn("Constant multiple out of range");
+ }
+ if (!a->IsA(AsmType::Int())) {
+ FAILn("Integer multiply of expects int");
+ }
+ current_function_builder_->EmitI32Const(static_cast<int32_t>(uvalue));
+ current_function_builder_->Emit(kExprI32Mul);
+ return AsmType::Intish();
+ }
+ AsmType* b = UnaryExpression();
+ if (a->IsA(AsmType::DoubleQ()) && b->IsA(AsmType::DoubleQ())) {
+ current_function_builder_->Emit(kExprF64Mul);
+ a = AsmType::Double();
+ } else if (a->IsA(AsmType::FloatQ()) && b->IsA(AsmType::FloatQ())) {
+ current_function_builder_->Emit(kExprF32Mul);
+ a = AsmType::Floatish();
+ } else {
+ FAILn("expected doubles or floats");
+ }
+ } else if (Check('/')) {
+ AsmType* b = MultiplicativeExpression();
+ if (a->IsA(AsmType::DoubleQ()) && b->IsA(AsmType::DoubleQ())) {
+ current_function_builder_->Emit(kExprF64Div);
+ a = AsmType::Double();
+ } else if (a->IsA(AsmType::FloatQ()) && b->IsA(AsmType::FloatQ())) {
+ current_function_builder_->Emit(kExprF32Div);
+ a = AsmType::Floatish();
+ } else if (a->IsA(AsmType::Signed()) && b->IsA(AsmType::Signed())) {
+ current_function_builder_->Emit(kExprI32AsmjsDivS);
+ a = AsmType::Intish();
+ } else if (a->IsA(AsmType::Unsigned()) && b->IsA(AsmType::Unsigned())) {
+ current_function_builder_->Emit(kExprI32AsmjsDivU);
+ a = AsmType::Intish();
+ } else {
+ FAILn("expected doubles or floats");
+ }
+ } else if (Check('%')) {
+ AsmType* b = MultiplicativeExpression();
+ if (a->IsA(AsmType::DoubleQ()) && b->IsA(AsmType::DoubleQ())) {
+ current_function_builder_->Emit(kExprF64Mod);
+ a = AsmType::Double();
+ } else if (a->IsA(AsmType::Signed()) && b->IsA(AsmType::Signed())) {
+ current_function_builder_->Emit(kExprI32AsmjsRemS);
+ a = AsmType::Intish();
+ } else if (a->IsA(AsmType::Unsigned()) && b->IsA(AsmType::Unsigned())) {
+ current_function_builder_->Emit(kExprI32AsmjsRemU);
+ a = AsmType::Intish();
+ } else {
+ FAILn("expected doubles or floats");
+ }
+ } else {
+ break;
+ }
+ }
+ return a;
+}
+
+// 6.8.9 AdditiveExpression
+AsmType* AsmJsParser::AdditiveExpression() {
+ AsmType* a = MultiplicativeExpression();
+ int n = 0;
+ for (;;) {
+ if (Check('+')) {
+ AsmType* b = MultiplicativeExpression();
+ if (a->IsA(AsmType::Double()) && b->IsA(AsmType::Double())) {
+ current_function_builder_->Emit(kExprF64Add);
+ a = AsmType::Double();
+ } else if (a->IsA(AsmType::FloatQ()) && b->IsA(AsmType::FloatQ())) {
+ current_function_builder_->Emit(kExprF32Add);
+ a = AsmType::Floatish();
+ } else if (a->IsA(AsmType::Int()) && b->IsA(AsmType::Int())) {
+ current_function_builder_->Emit(kExprI32Add);
+ a = AsmType::Intish();
+ n = 2;
+ } else if (a->IsA(AsmType::Intish()) && b->IsA(AsmType::Intish())) {
+ // TODO(bradnelson): b should really only be Int.
+ // specialize intish to capture count.
+ ++n;
+ if (n > (1 << 20)) {
+ FAILn("more than 2^20 additive values");
+ }
+ current_function_builder_->Emit(kExprI32Add);
+ } else {
+ FAILn("illegal types for +");
+ }
+ } else if (Check('-')) {
+ AsmType* b = MultiplicativeExpression();
+ if (a->IsA(AsmType::Double()) && b->IsA(AsmType::Double())) {
+ current_function_builder_->Emit(kExprF64Sub);
+ a = AsmType::Double();
+ } else if (a->IsA(AsmType::FloatQ()) && b->IsA(AsmType::FloatQ())) {
+ current_function_builder_->Emit(kExprF32Sub);
+ a = AsmType::Floatish();
+ } else if (a->IsA(AsmType::Int()) && b->IsA(AsmType::Int())) {
+ current_function_builder_->Emit(kExprI32Sub);
+ a = AsmType::Intish();
+ n = 2;
+ } else if (a->IsA(AsmType::Intish()) && b->IsA(AsmType::Intish())) {
+ // TODO(bradnelson): b should really only be Int.
+ // specialize intish to capture count.
+ ++n;
+ if (n > (1 << 20)) {
+ FAILn("more than 2^20 additive values");
+ }
+ current_function_builder_->Emit(kExprI32Sub);
+ } else {
+ FAILn("illegal types for +");
+ }
+ } else {
+ break;
+ }
+ }
+ return a;
+}
+
+// 6.8.10 ShiftExpression
+AsmType* AsmJsParser::ShiftExpression() {
+ AsmType* a = nullptr;
+ RECURSEn(a = AdditiveExpression());
+ for (;;) {
+ switch (scanner_.Token()) {
+// TODO(bradnelson): Implement backtracking to avoid emitting code
+// for the x >>> 0 case (similar to what's there for |0).
+#define HANDLE_CASE(op, opcode, name, result) \
+ case TOK(op): { \
+ EXPECT_TOKENn(TOK(op)); \
+ AsmType* b = nullptr; \
+ RECURSEn(b = AdditiveExpression()); \
+ if (!(a->IsA(AsmType::Intish()) && b->IsA(AsmType::Intish()))) { \
+ FAILn("Expected intish for operator " #name "."); \
+ } \
+ current_function_builder_->Emit(kExpr##opcode); \
+ a = AsmType::result(); \
+ continue; \
+ }
+ HANDLE_CASE(SHL, I32Shl, "<<", Signed);
+ HANDLE_CASE(SAR, I32ShrS, ">>", Signed);
+ HANDLE_CASE(SHR, I32ShrU, ">>>", Unsigned);
+#undef HANDLE_CASE
+ default:
+ return a;
+ }
+ }
+}
+
+// 6.8.11 RelationalExpression
+AsmType* AsmJsParser::RelationalExpression() {
+ AsmType* a = nullptr;
+ RECURSEn(a = ShiftExpression());
+ for (;;) {
+ switch (scanner_.Token()) {
+#define HANDLE_CASE(op, sop, uop, dop, fop, name) \
+ case op: { \
+ EXPECT_TOKENn(op); \
+ AsmType* b = nullptr; \
+ RECURSEn(b = ShiftExpression()); \
+ if (a->IsA(AsmType::Signed()) && b->IsA(AsmType::Signed())) { \
+ current_function_builder_->Emit(kExpr##sop); \
+ } else if (a->IsA(AsmType::Unsigned()) && b->IsA(AsmType::Unsigned())) { \
+ current_function_builder_->Emit(kExpr##uop); \
+ } else if (a->IsA(AsmType::Double()) && b->IsA(AsmType::Double())) { \
+ current_function_builder_->Emit(kExpr##dop); \
+ } else if (a->IsA(AsmType::Float()) && b->IsA(AsmType::Float())) { \
+ current_function_builder_->Emit(kExpr##fop); \
+ } else { \
+ FAILn("Expected signed, unsigned, double, or float for operator " #name \
+ "."); \
+ } \
+ a = AsmType::Int(); \
+ continue; \
+ }
+ HANDLE_CASE('<', I32LtS, I32LtU, F64Lt, F32Lt, "<");
+ HANDLE_CASE(TOK(LE), I32LeS, I32LeU, F64Le, F32Le, "<=");
+ HANDLE_CASE('>', I32GtS, I32GtU, F64Gt, F32Gt, ">");
+ HANDLE_CASE(TOK(GE), I32GeS, I32GeU, F64Ge, F32Ge, ">=");
+#undef HANDLE_CASE
+ default:
+ return a;
+ }
+ }
+}
+
+// 6.8.12 EqualityExpression
+AsmType* AsmJsParser::EqualityExpression() {
+ AsmType* a = nullptr;
+ RECURSEn(a = RelationalExpression());
+ for (;;) {
+ switch (scanner_.Token()) {
+#define HANDLE_CASE(op, sop, uop, dop, fop, name) \
+ case op: { \
+ EXPECT_TOKENn(op); \
+ AsmType* b = nullptr; \
+ RECURSEn(b = RelationalExpression()); \
+ if (a->IsA(AsmType::Signed()) && b->IsA(AsmType::Signed())) { \
+ current_function_builder_->Emit(kExpr##sop); \
+ } else if (a->IsA(AsmType::Unsigned()) && b->IsA(AsmType::Unsigned())) { \
+ current_function_builder_->Emit(kExpr##uop); \
+ } else if (a->IsA(AsmType::Double()) && b->IsA(AsmType::Double())) { \
+ current_function_builder_->Emit(kExpr##dop); \
+ } else if (a->IsA(AsmType::Float()) && b->IsA(AsmType::Float())) { \
+ current_function_builder_->Emit(kExpr##fop); \
+ } else { \
+ FAILn("Expected signed, unsigned, double, or float for operator " #name \
+ "."); \
+ } \
+ a = AsmType::Int(); \
+ continue; \
+ }
+ HANDLE_CASE(TOK(EQ), I32Eq, I32Eq, F64Eq, F32Eq, "==");
+ HANDLE_CASE(TOK(NE), I32Ne, I32Ne, F64Ne, F32Ne, "!=");
+#undef HANDLE_CASE
+ default:
+ return a;
+ }
+ }
+}
+
+// 6.8.13 BitwiseANDExpression
+AsmType* AsmJsParser::BitwiseANDExpression() {
+ AsmType* a = nullptr;
+ RECURSEn(a = EqualityExpression());
+ while (Check('&')) {
+ AsmType* b = nullptr;
+ RECURSEn(b = EqualityExpression());
+ if (a->IsA(AsmType::Intish()) && b->IsA(AsmType::Intish())) {
+ current_function_builder_->Emit(kExprI32And);
+ a = AsmType::Signed();
+ } else {
+ FAILn("Expected intish for operator &.");
+ }
+ }
+ return a;
+}
+
+// 6.8.14 BitwiseXORExpression
+AsmType* AsmJsParser::BitwiseXORExpression() {
+ AsmType* a = nullptr;
+ RECURSEn(a = BitwiseANDExpression());
+ while (Check('^')) {
+ AsmType* b = nullptr;
+ RECURSEn(b = BitwiseANDExpression());
+ if (a->IsA(AsmType::Intish()) && b->IsA(AsmType::Intish())) {
+ current_function_builder_->Emit(kExprI32Xor);
+ a = AsmType::Signed();
+ } else {
+ FAILn("Expected intish for operator &.");
+ }
+ }
+ return a;
+}
+
+// 6.8.15 BitwiseORExpression
+AsmType* AsmJsParser::BitwiseORExpression() {
+ AsmType* a = nullptr;
+ RECURSEn(a = BitwiseXORExpression());
+ while (Check('|')) {
+ // TODO(bradnelson): Make it prettier.
+ AsmType* b = nullptr;
+ bool zero = false;
+ int old_pos;
+ size_t old_code;
+ if (CheckForZero()) {
+ old_pos = scanner_.GetPosition();
+ old_code = current_function_builder_->GetPosition();
+ scanner_.Rewind();
+ zero = true;
+ }
+ RECURSEn(b = BitwiseXORExpression());
+ // Handle |0 specially.
+ if (zero && old_pos == scanner_.GetPosition()) {
+ current_function_builder_->StashCode(nullptr, old_code);
+ a = AsmType::Signed();
+ continue;
+ }
+ if (a->IsA(AsmType::Intish()) && b->IsA(AsmType::Intish())) {
+ current_function_builder_->Emit(kExprI32Ior);
+ a = AsmType::Signed();
+ } else {
+ FAILn("Expected intish for operator |.");
+ }
+ }
+ return a;
+}
+
+// 6.8.16 ConditionalExpression
+AsmType* AsmJsParser::ConditionalExpression() {
+ AsmType* test = nullptr;
+ RECURSEn(test = BitwiseORExpression());
+ if (Check('?')) {
+ if (!test->IsA(AsmType::Int())) {
+ FAILn("Expected int in condition of ternary operator.");
+ }
+ current_function_builder_->EmitWithU8(kExprIf, kLocalI32);
+ size_t fixup = current_function_builder_->GetPosition() -
+ 1; // Assumes encoding knowledge.
+ AsmType* cons = nullptr;
+ RECURSEn(cons = AssignmentExpression());
+ current_function_builder_->Emit(kExprElse);
+ EXPECT_TOKENn(':');
+ AsmType* alt = nullptr;
+ RECURSEn(alt = AssignmentExpression());
+ current_function_builder_->Emit(kExprEnd);
+ if (cons->IsA(AsmType::Int()) && alt->IsA(AsmType::Int())) {
+ current_function_builder_->FixupByte(fixup, kLocalI32);
+ return AsmType::Int();
+ } else if (cons->IsA(AsmType::Double()) && alt->IsA(AsmType::Double())) {
+ current_function_builder_->FixupByte(fixup, kLocalF64);
+ return AsmType::Double();
+ } else if (cons->IsA(AsmType::Float()) && alt->IsA(AsmType::Float())) {
+ current_function_builder_->FixupByte(fixup, kLocalF32);
+ return AsmType::Float();
+ } else {
+ FAILn("Type mismatch in ternary operator.");
+ }
+ } else {
+ return test;
+ }
+}
+
+// 6.8.17 ParenthesiedExpression
+AsmType* AsmJsParser::ParenthesizedExpression() {
+ call_coercion_ = nullptr;
+ AsmType* ret;
+ EXPECT_TOKENn('(');
+ RECURSEn(ret = Expression(nullptr));
+ EXPECT_TOKENn(')');
+ return ret;
+}
+
+// 6.9 ValidateCall
+AsmType* AsmJsParser::ValidateCall() {
+ AsmType* return_type = call_coercion_;
+ call_coercion_ = nullptr;
+ AsmJsScanner::token_t function_name = Consume();
+ int32_t tmp = TempVariable(0);
+ if (Check('[')) {
+ RECURSEn(EqualityExpression());
+ EXPECT_TOKENn('&');
+ uint64_t mask = 0;
+ if (!CheckForUnsigned(&mask)) {
+ FAILn("Expected mask literal");
+ }
+ if (mask > 0x7fffffff) {
+ FAILn("Expected power of 2 mask");
+ }
+ if (!base::bits::IsPowerOfTwo32(static_cast<uint32_t>(1 + mask))) {
+ FAILn("Expected power of 2 mask");
+ }
+ current_function_builder_->EmitI32Const(static_cast<uint32_t>(mask));
+ current_function_builder_->Emit(kExprI32And);
+ EXPECT_TOKENn(']');
+ VarInfo* function_info = GetVarInfo(function_name);
+ if (function_info->kind == VarKind::kUnused) {
+ function_info->kind = VarKind::kTable;
+ function_info->mask = static_cast<int32_t>(mask);
+ function_info->index = module_builder_->AllocateIndirectFunctions(
+ static_cast<uint32_t>(mask + 1));
+ } else {
+ if (function_info->kind != VarKind::kTable) {
+ FAILn("Expected call table");
+ }
+ if (function_info->mask != static_cast<int32_t>(mask)) {
+ FAILn("Mask size mismatch");
+ }
+ }
+ current_function_builder_->EmitI32Const(function_info->index);
+ current_function_builder_->Emit(kExprI32Add);
+ // We have to use a temporary for the correct order of evaluation.
+ current_function_builder_->EmitSetLocal(tmp);
+ }
+ std::vector<AsmType*> param_types;
+ ZoneVector<AsmType*> param_specific_types(zone());
+ EXPECT_TOKENn('(');
+ while (!failed_ && !Peek(')')) {
+ AsmType* t;
+ RECURSEn(t = AssignmentExpression());
+ param_specific_types.push_back(t);
+ if (t->IsA(AsmType::Int())) {
+ param_types.push_back(AsmType::Int());
+ } else if (t->IsA(AsmType::Float())) {
+ param_types.push_back(AsmType::Float());
+ } else if (t->IsA(AsmType::Double())) {
+ param_types.push_back(AsmType::Double());
+ } else {
+ std::string a = t->Name();
+ FAILn("Bad function argument type");
+ }
+ if (!Peek(')')) {
+ EXPECT_TOKENn(',');
+ }
+ }
+ EXPECT_TOKENn(')');
+ // TODO(bradnelson): clarify how this binds, and why only float?
+ if (Peek('|') &&
+ (return_type == nullptr || return_type->IsA(AsmType::Float()))) {
+ return_type = AsmType::Signed();
+ } else if (return_type == nullptr) {
+ return_type = AsmType::Void();
+ }
+ AsmType* function_type = AsmType::Function(zone(), return_type);
+ for (auto t : param_types) {
+ function_type->AsFunctionType()->AddArgument(t);
+ }
+
+ FunctionSig* sig = ConvertSignature(return_type, param_types);
+ if (sig == nullptr) {
+ FAILn("Invalid function signature");
+ }
+ uint32_t signature_index = module_builder_->AddSignature(sig);
+
+ // TODO(bradnelson): Fix this to use a less error prone pattern.
+ // Reload as table might have grown.
+ VarInfo* function_info = GetVarInfo(function_name);
+ if (function_info->kind == VarKind::kUnused) {
+ function_info->kind = VarKind::kFunction;
+ function_info->function_builder = module_builder_->AddFunction();
+ function_info->index = function_info->function_builder->func_index();
+ function_info->type = function_type;
+ // TODO(bradnelson): Figure out the right debug scanner offset and
+ // re-enable.
+ // current_function_builder_->AddAsmWasmOffset(scanner_.GetPosition(),
+ // scanner_.GetPosition());
+ current_function_builder_->Emit(kExprCallFunction);
+ current_function_builder_->EmitDirectCallIndex(function_info->index);
+ } else if (function_info->kind == VarKind::kImportedFunction) {
+ for (auto t : param_specific_types) {
+ if (!t->IsA(AsmType::Extern())) {
+ FAILn("Imported function args must be type extern");
+ }
+ }
+ if (return_type->IsA(AsmType::Float())) {
+ FAILn("Imported function can't be called as float");
+ }
+ DCHECK(function_info->import != nullptr);
+ // TODO(bradnelson): Factor out.
+ uint32_t cache_index = function_info->import->cache.FindOrInsert(sig);
+ uint32_t index;
+ if (cache_index >= function_info->import->cache_index.size()) {
+ index = module_builder_->AddImport(
+ function_info->import->name.data(),
+ static_cast<uint32_t>(function_info->import->name.size()), sig);
+ function_info->import->cache_index.push_back(index);
+ } else {
+ index = function_info->import->cache_index[cache_index];
+ }
+ current_function_builder_->Emit(kExprCallFunction);
+ current_function_builder_->EmitVarUint(index);
+ } else if (function_info->type->IsA(AsmType::None())) {
+ function_info->type = function_type;
+ if (function_info->kind == VarKind::kTable) {
+ current_function_builder_->EmitGetLocal(tmp);
+ // TODO(bradnelson): Figure out the right debug scanner offset and
+ // re-enable.
+ // current_function_builder_->AddAsmWasmOffset(scanner_.GetPosition(),
+ // scanner_.GetPosition());
+ current_function_builder_->Emit(kExprCallIndirect);
+ current_function_builder_->EmitVarUint(signature_index);
+ current_function_builder_->EmitVarUint(0); // table index
+ } else {
+ // current_function_builder_->AddAsmWasmOffset(scanner_.GetPosition(),
+ // scanner_.GetPosition());
+ current_function_builder_->Emit(kExprCallFunction);
+ current_function_builder_->EmitDirectCallIndex(function_info->index);
+ }
+ } else if (function_info->kind > VarKind::kImportedFunction) {
+ AsmCallableType* callable = function_info->type->AsCallableType();
+ if (!callable) {
+ FAILn("Expected callable function");
+ }
+ // TODO(bradnelson): Refactor AsmType to not need this.
+ if (callable->CanBeInvokedWith(return_type, param_specific_types)) {
+ // Return type ok.
+ } else if (return_type->IsA(AsmType::Void()) &&
+ callable->CanBeInvokedWith(AsmType::Float(),
+ param_specific_types)) {
+ return_type = AsmType::Float();
+ } else if (return_type->IsA(AsmType::Void()) &&
+ callable->CanBeInvokedWith(AsmType::Double(),
+ param_specific_types)) {
+ return_type = AsmType::Double();
+ } else if (return_type->IsA(AsmType::Void()) &&
+ callable->CanBeInvokedWith(AsmType::Signed(),
+ param_specific_types)) {
+ return_type = AsmType::Signed();
+ } else {
+ FAILn("Function use doesn't match definition");
+ }
+ switch (function_info->kind) {
+#define V(name, Name, op, sig) \
+ case VarKind::kMath##Name: \
+ current_function_builder_->Emit(op); \
+ break;
+ STDLIB_MATH_FUNCTION_MONOMORPHIC_LIST(V)
+#undef V
+#define V(name, Name, op, sig) \
+ case VarKind::kMath##Name: \
+ if (param_specific_types[0]->IsA(AsmType::DoubleQ())) { \
+ current_function_builder_->Emit(kExprF64##Name); \
+ } else if (param_specific_types[0]->IsA(AsmType::FloatQ())) { \
+ current_function_builder_->Emit(kExprF32##Name); \
+ } else { \
+ UNREACHABLE(); \
+ } \
+ break;
+ STDLIB_MATH_FUNCTION_CEIL_LIKE_LIST(V)
+#undef V
+ case VarKind::kMathMin:
+ case VarKind::kMathMax:
+ if (param_specific_types[0]->IsA(AsmType::Double())) {
+ for (size_t i = 1; i < param_specific_types.size(); ++i) {
+ if (function_info->kind == VarKind::kMathMin) {
+ current_function_builder_->Emit(kExprF64Min);
+ } else {
+ current_function_builder_->Emit(kExprF64Max);
+ }
+ }
+ } else if (param_specific_types[0]->IsA(AsmType::Float())) {
+ // NOTE: Not technically part of the asm.js spec, but Firefox
+ // accepts it.
+ for (size_t i = 1; i < param_specific_types.size(); ++i) {
+ if (function_info->kind == VarKind::kMathMin) {
+ current_function_builder_->Emit(kExprF32Min);
+ } else {
+ current_function_builder_->Emit(kExprF32Max);
+ }
+ }
+ } else if (param_specific_types[0]->IsA(AsmType::Int())) {
+ int32_t tmp_x = TempVariable(0);
+ int32_t tmp_y = TempVariable(1);
+ for (size_t i = 1; i < param_specific_types.size(); ++i) {
+ current_function_builder_->EmitSetLocal(tmp_x);
+ current_function_builder_->EmitTeeLocal(tmp_y);
+ current_function_builder_->EmitGetLocal(tmp_x);
+ if (function_info->kind == VarKind::kMathMin) {
+ current_function_builder_->Emit(kExprI32GeS);
+ } else {
+ current_function_builder_->Emit(kExprI32LeS);
+ }
+ current_function_builder_->EmitWithU8(kExprIf, kLocalI32);
+ current_function_builder_->EmitGetLocal(tmp_x);
+ current_function_builder_->Emit(kExprElse);
+ current_function_builder_->EmitGetLocal(tmp_y);
+ current_function_builder_->Emit(kExprEnd);
+ }
+ } else {
+ UNREACHABLE();
+ }
+ break;
+
+ case VarKind::kMathAbs:
+ if (param_specific_types[0]->IsA(AsmType::Signed())) {
+ int32_t tmp = TempVariable(0);
+ current_function_builder_->EmitTeeLocal(tmp);
+ current_function_builder_->Emit(kExprI32Clz);
+ current_function_builder_->EmitWithU8(kExprIf, kLocalI32);
+ current_function_builder_->EmitGetLocal(tmp);
+ current_function_builder_->Emit(kExprElse);
+ current_function_builder_->EmitI32Const(0);
+ current_function_builder_->EmitGetLocal(tmp);
+ current_function_builder_->Emit(kExprI32Sub);
+ current_function_builder_->Emit(kExprEnd);
+ } else if (param_specific_types[0]->IsA(AsmType::DoubleQ())) {
+ current_function_builder_->Emit(kExprF64Abs);
+ } else if (param_specific_types[0]->IsA(AsmType::FloatQ())) {
+ current_function_builder_->Emit(kExprF32Abs);
+ } else {
+ UNREACHABLE();
+ }
+ break;
+
+ case VarKind::kMathFround:
+ if (param_specific_types[0]->IsA(AsmType::DoubleQ())) {
+ current_function_builder_->Emit(kExprF32ConvertF64);
+ } else {
+ DCHECK(param_specific_types[0]->IsA(AsmType::FloatQ()));
+ }
+ break;
+
+ default:
+ UNREACHABLE();
+ }
+ } else {
+ if (function_info->kind != VarKind::kFunction &&
+ function_info->kind != VarKind::kTable) {
+ FAILn("Function name collides with variable");
+ }
+ AsmCallableType* callable = function_info->type->AsCallableType();
+ if (!callable ||
+ !callable->CanBeInvokedWith(return_type, param_specific_types)) {
+ FAILn("Function use doesn't match definition");
+ }
+ if (function_info->kind == VarKind::kTable) {
+ current_function_builder_->EmitGetLocal(tmp);
+ // TODO(bradnelson): Figure out the right debug scanner offset and
+ // re-enable.
+ // current_function_builder_->AddAsmWasmOffset(scanner_.GetPosition(),
+ // scanner_.GetPosition());
+ current_function_builder_->Emit(kExprCallIndirect);
+ current_function_builder_->EmitVarUint(signature_index);
+ current_function_builder_->EmitVarUint(0); // table index
+ } else {
+ // TODO(bradnelson): Figure out the right debug scanner offset and
+ // re-enable.
+ // current_function_builder_->AddAsmWasmOffset(scanner_.GetPosition(),
+ // scanner_.GetPosition());
+ current_function_builder_->Emit(kExprCallFunction);
+ current_function_builder_->EmitDirectCallIndex(function_info->index);
+ }
+ }
+
+ return return_type;
+}
+
+// 6.9 ValidateCall - helper
+bool AsmJsParser::PeekCall() {
+ if (!scanner_.IsGlobal()) {
+ return false;
+ }
+ if (GetVarInfo(scanner_.Token())->kind == VarKind::kFunction) {
+ return true;
+ }
+ if (GetVarInfo(scanner_.Token())->kind >= VarKind::kImportedFunction) {
+ return true;
+ }
+ if (GetVarInfo(scanner_.Token())->kind == VarKind::kUnused ||
+ GetVarInfo(scanner_.Token())->kind == VarKind::kTable) {
+ scanner_.Next();
+ if (Peek('(') || Peek('[')) {
+ scanner_.Rewind();
+ return true;
+ }
+ scanner_.Rewind();
+ }
+ return false;
+}
+
+// 6.10 ValidateHeapAccess
+void AsmJsParser::ValidateHeapAccess() {
+ VarInfo* info = GetVarInfo(Consume());
+ int32_t size = info->type->ElementSizeInBytes();
+ EXPECT_TOKEN('[');
+ uint64_t offset;
+ if (CheckForUnsigned(&offset)) {
+ // TODO(bradnelson): Check more things.
+ if (offset > 0x7fffffff || offset * size > 0x7fffffff) {
+ FAIL("Heap access out of range");
+ }
+ if (Check(']')) {
+ current_function_builder_->EmitI32Const(
+ static_cast<uint32_t>(offset * size));
+ // NOTE: This has to happen here to work recursively.
+ heap_access_type_ = info->type;
+ return;
+ } else {
+ scanner_.Rewind();
+ }
+ }
+ AsmType* index_type;
+ if (info->type->IsA(AsmType::Int8Array()) ||
+ info->type->IsA(AsmType::Uint8Array())) {
+ RECURSE(index_type = Expression(nullptr));
+ } else {
+ RECURSE(index_type = AdditiveExpression());
+ EXPECT_TOKEN(TOK(SAR));
+ uint64_t shift;
+ if (!CheckForUnsigned(&shift)) {
+ FAIL("Expected shift of word size");
+ }
+ if (shift > 3) {
+ FAIL("Expected valid heap access shift");
+ }
+ if ((1 << shift) != size) {
+ FAIL("Expected heap access shift to match heap view");
+ }
+ // Mask bottom bits to match asm.js behavior.
+ current_function_builder_->EmitI32Const(~(size - 1));
+ current_function_builder_->Emit(kExprI32And);
+ }
+ if (!index_type->IsA(AsmType::Intish())) {
+ FAIL("Expected intish index");
+ }
+ EXPECT_TOKEN(']');
+ // NOTE: This has to happen here to work recursively.
+ heap_access_type_ = info->type;
+}
+
+// 6.11 ValidateFloatCoercion
+void AsmJsParser::ValidateFloatCoercion() {
+ if (!scanner_.IsGlobal() ||
+ !GetVarInfo(scanner_.Token())->type->IsA(stdlib_fround_)) {
+ FAIL("Expected fround");
+ }
+ scanner_.Next();
+ EXPECT_TOKEN('(');
+ call_coercion_ = AsmType::Float();
+ AsmType* ret;
+ RECURSE(ret = ValidateExpression());
+ if (ret->IsA(AsmType::Floatish())) {
+ // Do nothing, as already a float.
+ } else if (ret->IsA(AsmType::DoubleQ())) {
+ current_function_builder_->Emit(kExprF32ConvertF64);
+ } else if (ret->IsA(AsmType::Signed())) {
+ current_function_builder_->Emit(kExprF32SConvertI32);
+ } else if (ret->IsA(AsmType::Unsigned())) {
+ current_function_builder_->Emit(kExprF32UConvertI32);
+ } else {
+ FAIL("Illegal conversion to float");
+ }
+ EXPECT_TOKEN(')');
+}
+
+void AsmJsParser::GatherCases(std::vector<int32_t>* cases) {
+ int start = scanner_.GetPosition();
+ int depth = 0;
+ for (;;) {
+ if (Peek('{')) {
+ ++depth;
+ } else if (Peek('}')) {
+ --depth;
+ if (depth <= 0) {
+ break;
+ }
+ } else if (depth == 1 && Peek(TOK(case))) {
+ scanner_.Next();
+ int32_t value;
+ uint64_t uvalue;
+ if (Check('-')) {
+ if (!CheckForUnsigned(&uvalue)) {
+ break;
+ }
+ value = -static_cast<int32_t>(uvalue);
+ } else {
+ if (!CheckForUnsigned(&uvalue)) {
+ break;
+ }
+ value = static_cast<int32_t>(uvalue);
+ }
+ cases->push_back(value);
+ } else if (Peek(AsmJsScanner::kEndOfInput)) {
+ break;
+ }
+ scanner_.Next();
+ }
+ scanner_.Seek(start);
+}
+
+} // namespace wasm
+} // namespace internal
+} // namespace v8
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