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https://github.com/irmen/prog8.git
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variables are reset to their declared value when entering the scope again
This commit is contained in:
Irmen de Jong
parent
314e5ca9e2
commit
30b58c8567
@ -36,8 +36,7 @@
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_vm_gfx_text(8, 6, 1, "Spin")
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_vm_gfx_text(29, 11, 1, "to Win !")
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byte i
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for i in 0 to width//10 {
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for byte i in 0 to width//10 {
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_vm_gfx_line(i*2+width//2-width//10, 130, i*10.w, 199, 6)
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}
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@ -109,7 +108,6 @@
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_vm_gfx_pixel(sx-1, sy+1, color)
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_vm_gfx_pixel(sx, sy+1, color)
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_vm_gfx_pixel(sx+1, sy+1, color)
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_vm_gfx_pixel(sx, sy-2, color)
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_vm_gfx_pixel(sx+2, sy, color)
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_vm_gfx_pixel(sx, sy+2, color)
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@ -15,17 +15,13 @@
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for word pixelx in xoffset to xoffset+width-1 {
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float xx = flt((pixelx-xoffset))/width/3.0+0.2
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float xsquared
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float ysquared
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float x
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float y
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byte iter ; @todo re-initialize variable when entering scope
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x = 0.0
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y = 0.0
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xsquared = 0
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ysquared = 0
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iter = 0
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float xsquared = 0.0
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float ysquared = 0.0
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float x = 0.0
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float y = 0.0
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byte iter = 0
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while (iter<32 and xsquared+ysquared<4.0) {
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y = x*y*2.0 + yy
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x = xsquared - ysquared + xx
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@ -37,10 +33,8 @@
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_vm_gfx_pixel(pixelx, pixely, iter)
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}
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}
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_vm_gfx_text(11, 21, 1, "Finished!")
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}
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}
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@ -4,15 +4,46 @@
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~ main {
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byte mainb = 44
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sub start() {
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test()
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test()
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}
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; word [20] prime_numbers = [2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71] ; todo array_w!!!
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word [20] fibonacci_numbers = [0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584, 4181]
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sub test() {
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for word fibnr in fibonacci_numbers {
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_vm_write_num(fibnr)
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; @todo test assigning values to array vars
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; @todo test creating const array vars
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byte subb=42
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for byte i in 0 to 2 {
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float ff=3.3
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byte bb=99
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word ww=1999
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_vm_write_num(ff)
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_vm_write_char('\n')
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_vm_write_num(bb)
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_vm_write_char('\n')
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_vm_write_num(ww)
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_vm_write_char('\n')
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_vm_write_num(subb)
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_vm_write_char('\n')
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_vm_write_num(mainb)
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_vm_write_char('\n')
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_vm_write_char('\n')
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ff += 3
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bb += 3
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ww += 3
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subb += 3
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mainb += 3
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}
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return
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}
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}
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@ -623,7 +623,7 @@ class VarDecl(val type: VarDeclType,
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}
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class Assignment(var target: AssignTarget, val aug_op : String?, var value: IExpression, override val position: Position) : IStatement {
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open class Assignment(var target: AssignTarget, val aug_op : String?, var value: IExpression, override val position: Position) : IStatement {
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override lateinit var parent: Node
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override fun linkParents(parent: Node) {
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@ -639,6 +639,12 @@ class Assignment(var target: AssignTarget, val aug_op : String?, var value: IExp
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}
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}
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// This is a special class so the compiler can see if the assignments are for initializing the vars in the scope,
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// or just a regular assignment. It may optimize the initialization step from this.
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class VariableInitializationAssignment(target: AssignTarget, aug_op: String?, value: IExpression, position: Position)
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: Assignment(target, aug_op, value, position)
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data class AssignTarget(val register: Register?,
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val identifier: IdentifierReference?,
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val arrayindexed: ArrayIndexedExpression?,
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@ -95,21 +95,22 @@ class StatementReorderer(private val namespace: INameScope, private val heap: He
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override fun process(decl: VarDecl): IStatement {
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super.process(decl)
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if(decl.type==VarDeclType.VAR || decl.type==VarDeclType.CONST) {
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if(decl.value!=null && decl.value?.constValue(namespace, heap)==null) {
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// the value assigned to the variable isn't a constant.
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// replace the var decl with an assignment and add a new vardecl with the default constant value.
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val scope = decl.definingScope()
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if(scope !in vardeclsToAdd)
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vardeclsToAdd[scope] = mutableListOf()
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vardeclsToAdd[scope]!!.add(decl.asDefaultValueDecl())
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return Assignment(
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AssignTarget(null, IdentifierReference(decl.scopedname.split("."), decl.position), null, decl.position),
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null,
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decl.value!!,
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decl.position
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)
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}
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if(decl.type!=VarDeclType.VAR || decl.value==null)
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return decl
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// for variables that are not on the heap (so: byte, word, float),
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// replace the var decl with an assignment and add a new vardecl with the default constant value.
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if(decl.datatype == DataType.BYTE || decl.datatype==DataType.WORD || decl.datatype==DataType.FLOAT) {
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val scope = decl.definingScope()
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if(scope !in vardeclsToAdd)
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vardeclsToAdd[scope] = mutableListOf()
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vardeclsToAdd[scope]!!.add(decl.asDefaultValueDecl())
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return VariableInitializationAssignment(
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AssignTarget(null, IdentifierReference(decl.scopedname.split("."), decl.position), null, decl.position),
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null,
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decl.value!!,
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decl.position
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)
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}
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return decl
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}
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@ -389,6 +389,7 @@ private class StatementTranslator(private val stackvmProg: StackVmProgram,
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when (stmt) {
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is Label -> translate(stmt)
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is Return -> translate(stmt)
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is VariableInitializationAssignment -> translate(stmt) // for initializing vars in a scope
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is Assignment -> translate(stmt) // normal and augmented assignments
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is PostIncrDecr -> translate(stmt)
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is Jump -> translate(stmt)
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@ -1174,6 +1175,13 @@ private class StatementTranslator(private val stackvmProg: StackVmProgram,
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}
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}
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private fun translate(stmt: VariableInitializationAssignment) {
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// this is an assignment to initialize a variable's value in the scope.
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// the compiler can perhaps optimize this phase.
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translate(stmt as Assignment)
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}
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private fun translate(stmt: Assignment) {
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stackvmProg.line(stmt.position)
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translate(stmt.value)
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@ -298,12 +298,15 @@ The largest 5-byte MFLPT float that can be stored is: **1.7014118345e+38** (ne
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Initial values across multiple runs of the program
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. todo::
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The initial values of your variables will be restored automatically when the program is (re)started,
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*except for string variables, arrays and matrices*. It is assumed these are left unchanged by the program.
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If you do modify them in-place, you should take care yourself that they work as
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expected when the program is restarted.
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When declaring values with an initial value, this value will be set into the variable each time
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the program reaches the declaration again. This can be in loops, multiple subroutine calls,
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or even multiple invocations of the entire program.
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This only works for simple types, *and not for string variables, arrays and matrices*.
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It is assumed these are left unchanged by the program.
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If you do modify them in-place, you should take care yourself that they work as
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expected when the program is restarted.
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(This is an optimization choice to avoid having to store two copies of every string and array)
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Indirect addressing and address-of
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