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Merge pull request #997 from chriseth/linkingwithunderscores

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Fix linking for libraries with underscores.
This commit is contained in:
chriseth 2016-09-06 12:52:31 +02:00 committed by GitHub
commit 71a4074ad0
2 changed files with 24 additions and 17 deletions
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1
Changelog.md
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@ -40,6 +40,7 @@ Bugfixes:
* JSON AST: nodes were added at wrong parent
* Why3 translator: crash fix for exponentiation
* Commandline Interface: linking libraries with underscores in their name.
* Type Checker: Fallback function cannot return data anymore.
* Code Generator: Fix crash when sha3() was used on unsupported types.

40
solc/CommandLineInterface.cpp
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@ -778,37 +778,43 @@ void CommandLineInterface::actOnInput()
bool CommandLineInterface::link()
{
// Map from how the libraries will be named inside the bytecode to their addresses.
map<string, h160> librariesReplacements;
int const placeholderSize = 40; // 20 bytes or 40 hex characters
for (auto const& library: m_libraries)
{
string const& name = library.first;
// Library placeholders are 40 hex digits (20 bytes) that start and end with '__'.
// This leaves 36 characters for the library name, while too short library names are
// padded on the right with '_' and too long names are truncated.
string replacement = "__";
for (size_t i = 0; i < placeholderSize - 4; ++i)
replacement.push_back(i < name.size() ? name[i] : '_');
replacement += "__";
librariesReplacements[replacement] = library.second;
}
for (auto& src: m_sourceCodes)
{
auto end = src.second.end();
for (auto it = src.second.begin(); it != end;)
{
while (it != end && *it != '_') ++it;
auto insertStart = it;
while (it != end && *it == '_') ++it;
auto nameStart = it;
while (it != end && *it != '_') ++it;
auto nameEnd = it;
while (it != end && *it == '_') ++it;
auto insertEnd = it;
if (insertStart == end)
break;
if (insertEnd - insertStart != 40)
if (it == end) break;
if (end - it < placeholderSize)
{
cerr << "Error in binary object file " << src.first << " at position " << (insertStart - src.second.begin()) << endl;
cerr << "Error in binary object file " << src.first << " at position " << (end - src.second.begin()) << endl;
return false;
}
string name(nameStart, nameEnd);
if (m_libraries.count(name))
string name(it, it + placeholderSize);
if (librariesReplacements.count(name))
{
string hexStr(toHex(m_libraries.at(name).asBytes()));
copy(hexStr.begin(), hexStr.end(), insertStart);
string hexStr(toHex(librariesReplacements.at(name).asBytes()));
copy(hexStr.begin(), hexStr.end(), it);
}
else
cerr << "Reference \"" << name << "\" in file \"" << src.first << "\" still unresolved." << endl;
it += placeholderSize;
}
}
return true;