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Issue warnings if stack is not balanced after inline assembly block

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This commit is contained in:
Alex Beregszaszi 2016-10-20 01:09:28 +01:00
parent e1ff8bebe1
commit c3330faf21
1 changed files with 24 additions and 2 deletions
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26
libsolidity/inlineasm/AsmCodeGen.cpp
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@ -23,6 +23,7 @@
#include <libsolidity/inlineasm/AsmCodeGen.h>
#include <memory>
#include <functional>
#include <libdevcore/CommonIO.h>
#include <libevmasm/Assembly.h>
#include <libevmasm/SourceLocation.h>
#include <libevmasm/Instruction.h>
@ -213,10 +214,31 @@ public:
void operator()(assembly::Block const& _block)
{
size_t numVariables = m_state.variables.size();
int deposit = m_state.assembly.deposit();
std::for_each(_block.statements.begin(), _block.statements.end(), boost::apply_visitor(*this));
// pop variables
// we deliberately do not check stack height
deposit = m_state.assembly.deposit() - deposit;
m_state.assembly.setSourceLocation(_block.location);
// issue warnings for stack height discrepancies
if (deposit < 0)
{
m_state.addError(
Error::Type::Warning,
"Inline assembly block is not balanced. It takes " + toString(-deposit) + " item(s) from the stack.",
_block.location
);
}
else if (deposit > 0)
{
m_state.addError(
Error::Type::Warning,
"Inline assembly block is not balanced. It leaves " + toString(deposit) + " item(s) on the stack.",
_block.location
);
}
// pop variables
while (m_state.variables.size() > numVariables)
{
m_state.assembly.append(solidity::Instruction::POP);