Generator

Code Generator

About

Code generator's functions are called from parser when specific criterion is met and it generates IFJcode20 code depending on what we are currently generating and it sends it to stdout. If everything were generated correctly we are able to send it to interpreter (which was written by our dear professors) and run it.

Functions

• GenerateHeader - generates header required by ic20int and jump to main function
• GenerateFunction - generates beginning of function or entire function code if it's internal function (if internal, label starts with _, otherwise $)
• GenerateFuncArguments - generates function's arguments and pops them from stack
• GenerateFuncCall - generates call for specified function
• GenerateFuncReturn - generates pushes of return values to stack
• GenerateFuncEnd - generates end of function (return to last instruction and frame pop)
• GenerateDefinitions - generates definition of variable
• GenerateAssignments - generates variable's assignment
• GeneratorPrint - generates internal function for printing, outputs 1 argument to stdout
• GenerateIfScope - generates if, else if, else scope
• GenerateForBeginning - generates counter variable definition
• GenerateForExpression - generates assignment + expression of for loop
• GenerateForCondition - generates condition for ending for loop
• GenerateForAssignment - generates label of for assignment
• GenerateForAssignmentEnd - generates jump to for expression (after assignment is done)
• GenerateForScope - generates beginning of for loop scope
• GenerateForScopeEnd - generates end of for loop scope
• IgnoreIfScope - determines whether if, else if or else scope will be ignored and not generated
• GeneratorSaveID - adds identifier to end of list for definition or assignment
• GeneratorGetID - gets last added identifier
• GenerateUsedInternalFunctions - generates used internal functions (if none, don't generate)
• GeneratorPrintCheck - check that printArguments is true, if so pop + print the value to stdout, otherwise do nothing
• GenerateCodeInternal - generates internal code (internal function code, header)
• SetUpCodeInternal - sets up code variable for generating internal function code
• IsFuncInternal - checks that given name is really internal function

Usage

In contrast with scanner or parser we don't call just one function here, which would then proceed to call other functions, but we have to call corresponding function to where we are currently in parser and what we need to generate. For that function names should be great indicator for what to use.