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LibWasm: Start implementing a naive bytecode interpreter

As the parser now flattens out the instructions and inserts synthetic
nesting/structured instructions where needed, we can treat the whole
thing as a simple parsed bytecode stream.
This currently knows how to execute the following instructions:
- unreachable
- nop
- local.get
- local.set
- {i,f}{32,64}.const
- block
- loop
- if/else
- branch / branch_if
- i32_add
- i32_and/or/xor
- i32_ne

This also extends the 'wasm' utility to optionally execute the first
function in the module with optionally user-supplied arguments.
This commit is contained in:
Ali Mohammad Pur 2021-05-01 03:19:01 +04:30 committed by Andreas Kling
parent faa34a0a8b
commit 056be42c0b
10 changed files with 513 additions and 30 deletions

View file

@ -24,7 +24,7 @@ public:
{
m_current_frame = frame.ptr();
m_stack.push(move(frame));
m_stack.push(make<Label>(m_current_frame->expression().instructions().size() - 1));
m_stack.push(make<Label>(m_current_frame->arity(), m_current_frame->expression().instructions().size() - 1));
}
auto& frame() const { return m_current_frame; }
auto& frame() { return m_current_frame; }
@ -34,10 +34,14 @@ public:
auto& depth() { return m_depth; }
auto& stack() const { return m_stack; }
auto& stack() { return m_stack; }
auto& store() const { return m_store; }
auto& store() { return m_store; }
Result call(FunctionAddress, Vector<Value> arguments);
Result execute();
void dump_stack();
private:
Store& m_store;
Frame* m_current_frame { nullptr };