1. Optimize if statements (parity with OG compiler):
- discard empty 'alternative' blocks
- optimize to the consequent if the predicate is a nonzero integer
- optimize to the alternative, or an empty block if there is none, if the predicate is a zero integer.
2. In comparison mode, emit module functions in the same order as the OG compiler.
This is because the OG compiler can emit declarations for module functions that it doesn't actually call, and in a different order than calls to actual module functions.
Adds:
- analyzer/Constants: holds constant name -> value for lookup
- ast/ConstDeclaration: AST node for a const declaration
- optimizer/ConstValidator: validates that an optimized expression is valid to use as a constant.
the Optimizer converts Identifiers that refer to a constant to the optimized constant value.
Adds:
- ast/UserFunction AST node for user-defined functions.
- astbuilder/AvailableUserFunction: reference to a parse tree for a user function.
- The AST builder only generates ASTs for user functions that are actually referenced.
- astbuilder/UserFunctionVisitor: visits (builds an AST for) a parse tree for a user function.
- This happens after the .src or .inc file has been otherwise processed, so this class serves to hook up the correct SourceFileIdentifier to the AST.
Adds:
- UnaryOperator: AST node for unary operators -, ++, --, and so forth
- UnaryOperatorOptimizer: optimizes a unary operator with its operand
- now integer and float negation, and integer inversion
- later x[y]++ to a single instruction
Also:
- automatically include basic.em, which includes some parameter defaults like -1.
This allows the compiler to generate output for a hello, world script with the exact same .ecl output as the legacy compiler.
Adds enough to build the AST nodes for the module function declarations in a .em file.
Adds:
- Function: base class for module function declarations and user functions
- FunctionParameterDeclaration: declaration for a function parameter, as well as its default value if any
- FunctionParameterList: just a holder for function parameter declarations
- ModuleFunctionDeclaration: for function declarations in .em files
- FunctionResolver: hooks up function calls to module functions or user functions
- ModuleProcessor: a visitor for processing const declarations and module function declarations (const declarations are yet to come from the main branch)
Add astbuilder/BuilderWorkspace:
- Temporary workspace used while building the AST (which goes in the CompilerWorkspace)
Add astbuilder/CompilerWorkspaceBuilder:
- Builds a CompilerWorkspace for a script
Add model/CompilerWorkspace:
- Holds AST
- Holds some intermediate data used by semantic analyzer, optimizer, code generator
