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Control flow analysis for inline assembly.

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This commit is contained in:
Daniel Kirchner
2020-03-09 16:23:10 +01:00
parent b7c001eb7f
commit 809e3503ba
29 changed files with 526 additions and 46 deletions
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libyul/backends/evm/EVMDialect.cpp
+2
View File
@@ -52,6 +52,8 @@ pair<YulString, BuiltinFunctionForEVM> createEVMFunction(
f.parameters.resize(info.args);
f.returns.resize(info.ret);
f.sideEffects = EVMDialect::sideEffectsOfInstruction(_instruction);
f.controlFlowSideEffects.terminates = evmasm::SemanticInformation::terminatesControlFlow(_instruction);
f.controlFlowSideEffects.reverts = evmasm::SemanticInformation::reverts(_instruction);
f.isMSize = _instruction == evmasm::Instruction::MSIZE;
f.literalArguments = false;
f.instruction = _instruction;
libyul/backends/wasm/WasmDialect.cpp
+12 -4
View File
@@ -99,6 +99,8 @@ WasmDialect::WasmDialect()
addFunction("unreachable", {}, {}, false);
m_functions["unreachable"_yulstring].sideEffects.invalidatesStorage = false;
m_functions["unreachable"_yulstring].sideEffects.invalidatesMemory = false;
m_functions["unreachable"_yulstring].controlFlowSideEffects.terminates = true;
m_functions["unreachable"_yulstring].controlFlowSideEffects.reverts = true;
addFunction("datasize", {i64}, {i64}, true, true);
addFunction("dataoffset", {i64}, {i64}, true, true);
@@ -147,7 +149,12 @@ void WasmDialect::addEthereumExternals()
static string const i64{"i64"};
static string const i32{"i32"};
static string const i32ptr{"i32"}; // Uses "i32" on purpose.
struct External { string name; vector<string> parameters; vector<string> returns; };
struct External {
string name;
vector<string> parameters;
vector<string> returns;
ControlFlowSideEffects controlFlowSideEffects = {};
};
static vector<External> externals{
{"getAddress", {i32ptr}, {}},
{"getExternalBalance", {i32ptr, i32ptr}, {}},
@@ -175,11 +182,11 @@ void WasmDialect::addEthereumExternals()
{"log", {i32ptr, i32, i32, i32ptr, i32ptr, i32ptr, i32ptr}, {}},
{"getBlockNumber", {}, {i64}},
{"getTxOrigin", {i32ptr}, {}},
{"finish", {i32ptr, i32}, {}},
{"revert", {i32ptr, i32}, {}},
{"finish", {i32ptr, i32}, {}, {true, false}},
{"revert", {i32ptr, i32}, {}, {true, true}},
{"getReturnDataSize", {}, {i32}},
{"returnDataCopy", {i32ptr, i32, i32}, {}},
{"selfDestruct", {i32ptr}, {}},
{"selfDestruct", {i32ptr}, {}, {true, false}},
{"getBlockTimestamp", {}, {i64}}
};
for (External const& ext: externals)
@@ -193,6 +200,7 @@ void WasmDialect::addEthereumExternals()
f.returns.emplace_back(YulString(p));
// TODO some of them are side effect free.
f.sideEffects = SideEffects::worst();
f.controlFlowSideEffects = ext.controlFlowSideEffects;
f.isMSize = false;
f.sideEffects.invalidatesStorage = (ext.name == "storageStore");
f.literalArguments = false;