mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 22:02:23 +01:00
Richard Smith
4b69264cb1
Add validation that every code block in a function is terminated by a sequence of terminating instructions, and that terminators don't appear anywhere else in code blocks. This required tracking whether we're in a reachable code block. That's done on the fly when we create a new code block; the new `SemanticsNodeBlockId::Unreachable` is used to represent the case where we're not actually creating a code block because we're in unreachable code.
49 lines
1.5 KiB
C++
49 lines
1.5 KiB
C++
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
|
|
// Exceptions. See /LICENSE for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
|
|
#include "toolchain/semantics/semantics_node_block_stack.h"
|
|
|
|
#include "common/vlog.h"
|
|
#include "toolchain/semantics/semantics_node.h"
|
|
|
|
namespace Carbon {
|
|
|
|
auto SemanticsNodeBlockStack::Push(SemanticsNodeBlockId id) -> void {
|
|
CARBON_VLOG() << name_ << " Push " << stack_.size() << "\n";
|
|
CARBON_CHECK(stack_.size() < (1 << 20))
|
|
<< "Excessive stack size: likely infinite loop";
|
|
stack_.push_back(id);
|
|
}
|
|
|
|
auto SemanticsNodeBlockStack::PeekForAdd() -> SemanticsNodeBlockId {
|
|
CARBON_CHECK(!stack_.empty()) << "no current block";
|
|
auto& back = stack_.back();
|
|
if (!back.is_valid()) {
|
|
back = semantics_ir_->AddNodeBlock();
|
|
CARBON_VLOG() << name_ << " Add " << stack_.size() - 1 << ": " << back
|
|
<< "\n";
|
|
}
|
|
return back;
|
|
}
|
|
|
|
auto SemanticsNodeBlockStack::Pop() -> SemanticsNodeBlockId {
|
|
CARBON_CHECK(!stack_.empty()) << "no current block";
|
|
auto back = stack_.pop_back_val();
|
|
CARBON_VLOG() << name_ << " Pop " << stack_.size() << ": " << back << "\n";
|
|
if (!back.is_valid()) {
|
|
return SemanticsNodeBlockId::Empty;
|
|
}
|
|
return back;
|
|
}
|
|
|
|
auto SemanticsNodeBlockStack::PrintForStackDump(llvm::raw_ostream& output) const
|
|
-> void {
|
|
output << name_ << ":\n";
|
|
for (int i = 0; i < static_cast<int>(stack_.size()); ++i) {
|
|
output << "\t" << i << ".\t" << stack_[i] << "\n";
|
|
}
|
|
}
|
|
|
|
} // namespace Carbon
|