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LibJS: Use ranges instead of specifying all registers for NewArray

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Listing all the registers will lead to the inability to allocate enough
space in one basic block (as there can be an arbitrary number of
registers used), instead switch to specifying the range of registers
used and save a lot of space in the process.
This commit is contained in:
Ali Mohammad Pur
2022-03-14 14:48:42 +00:00
committed by Ali Mohammad Pur
parent e517cb505a
commit a37bee919a
3 changed files with 50 additions and 23 deletions
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61
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@@ -845,24 +845,33 @@ Bytecode::CodeGenerationErrorOr<void> ObjectExpression::generate_bytecode(Byteco
Bytecode::CodeGenerationErrorOr<void> ArrayExpression::generate_bytecode(Bytecode::Generator& generator) const
{
Vector<Bytecode::Register> element_regs;
for (auto& element : m_elements) {
if (element && is<SpreadExpression>(*element)) {
return Bytecode::CodeGenerationError {
this,
"Unimplemented element kind: SpreadExpression"sv,
};
}
element_regs.append(generator.allocate_register());
}
size_t i = 0;
for (auto& element : m_elements) {
if (element) {
TRY(element->generate_bytecode(generator));
if (is<SpreadExpression>(*element)) {
return Bytecode::CodeGenerationError {
this,
"Unimplemented element kind: SpreadExpression"sv,
};
}
if (is<SpreadExpression>(*element))
VERIFY_NOT_REACHED();
} else {
generator.emit<Bytecode::Op::LoadImmediate>(Value {});
}
auto element_reg = generator.allocate_register();
auto& element_reg = element_regs[i++];
generator.emit<Bytecode::Op::Store>(element_reg);
element_regs.append(element_reg);
}
generator.emit_with_extra_register_slots<Bytecode::Op::NewArray>(element_regs.size(), element_regs);
if (element_regs.is_empty()) {
generator.emit<Bytecode::Op::NewArray>();
} else {
generator.emit_with_extra_register_slots<Bytecode::Op::NewArray>(2u, AK::Array { element_regs.first(), element_regs.last() });
}
return {};
}
@@ -1394,14 +1403,24 @@ Bytecode::CodeGenerationErrorOr<void> TaggedTemplateLiteral::generate_bytecode(B
for (size_t i = 0; i < expressions.size(); ++i) {
if (i % 2 != 0)
continue;
TRY(expressions[i].generate_bytecode(generator));
auto string_reg = generator.allocate_register();
generator.emit<Bytecode::Op::Store>(string_reg);
string_regs.append(string_reg);
string_regs.append(generator.allocate_register());
}
generator.emit_with_extra_register_slots<Bytecode::Op::NewArray>(string_regs.size(), string_regs);
size_t reg_index = 0;
for (size_t i = 0; i < expressions.size(); ++i) {
if (i % 2 != 0)
continue;
TRY(expressions[i].generate_bytecode(generator));
auto string_reg = string_regs[reg_index++];
generator.emit<Bytecode::Op::Store>(string_reg);
}
if (string_regs.is_empty()) {
generator.emit<Bytecode::Op::NewArray>();
} else {
generator.emit_with_extra_register_slots<Bytecode::Op::NewArray>(2u, AK::Array { string_regs.first(), string_regs.last() });
}
auto strings_reg = generator.allocate_register();
generator.emit<Bytecode::Op::Store>(strings_reg);
@@ -1418,14 +1437,22 @@ Bytecode::CodeGenerationErrorOr<void> TaggedTemplateLiteral::generate_bytecode(B
}
Vector<Bytecode::Register> raw_string_regs;
for ([[maybe_unused]] auto& raw_string : m_template_literal->raw_strings())
string_regs.append(generator.allocate_register());
reg_index = 0;
for (auto& raw_string : m_template_literal->raw_strings()) {
TRY(raw_string.generate_bytecode(generator));
auto raw_string_reg = generator.allocate_register();
auto raw_string_reg = string_regs[reg_index++];
generator.emit<Bytecode::Op::Store>(raw_string_reg);
raw_string_regs.append(raw_string_reg);
}
generator.emit_with_extra_register_slots<Bytecode::Op::NewArray>(raw_string_regs.size(), raw_string_regs);
if (raw_string_regs.is_empty()) {
generator.emit<Bytecode::Op::NewArray>();
} else {
generator.emit_with_extra_register_slots<Bytecode::Op::NewArray>(2u, AK::Array { raw_string_regs.first(), raw_string_regs.last() });
}
auto raw_strings_reg = generator.allocate_register();
generator.emit<Bytecode::Op::Store>(raw_strings_reg);