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Starting user defined functions

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This commit is contained in:
Carl-Henrik Skårstedt 2020-01-14 18:53:02 -08:00
parent 09796bc6e7
commit 846bd5cd63
1 changed files with 98 additions and 2 deletions
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100
x65.cpp
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@ -145,6 +145,7 @@ enum StatusCode {
ERROR_STOP_PROCESSING_ON_HIGHER, // errors greater than this will stop execution
ERROR_BRANCH_OUT_OF_RANGE,
ERROR_INCOMPLETE_FUNCTION,
ERROR_TARGET_ADDRESS_MUST_EVALUATE_IMMEDIATELY,
ERROR_TOO_DEEP_SCOPE,
ERROR_UNBALANCED_SCOPE_CLOSURE,
@ -218,6 +219,7 @@ const char *aStatusStrings[STATUSCODE_COUNT] = {
"Errors after this point will stop execution", // ERROR_STOP_PROCESSING_ON_HIGHER, // errors greater than this will stop execution
"Branch is out of range", // ERROR_BRANCH_OUT_OF_RANGE,
"Function declaration is missing name or expression", // ERROR_INCOMPLETE_FUNCTION,
"Target address must evaluate immediately for this operation", // ERROR_TARGET_ADDRESS_MUST_EVALUATE_IMMEDIATELY,
"Scoping is too deep", // ERROR_TOO_DEEP_SCOPE,
"Unbalanced scope closure", // ERROR_UNBALANCED_SCOPE_CLOSURE,
@ -273,6 +275,7 @@ enum AssemblerDirective {
AD_CONST, // CONST: Prevent a label from mutating during assemble
AD_LABEL, // LABEL: Create a mutable label (optional)
AD_STRING, // STRING: Declare a string symbol
AD_FUNCTION, // FUNCTION: Declare a user defined function
AD_UNDEF, // UNDEF: remove a string or a label
AD_INCSYM, // INCSYM: Reference labels from another assemble
AD_LABPOOL, // POOL: Create a pool of addresses to assign as labels dynamically
@ -1003,6 +1006,7 @@ DirectiveName aDirectiveNames[] {
{ "CONST", AD_CONST },
{ "LABEL", AD_LABEL },
{ "STRING", AD_STRING },
{ "FUNCTION", AD_FUNCTION },
{ "UNDEF", AD_UNDEF },
{ "INCSYM", AD_INCSYM },
{ "LABPOOL", AD_LABPOOL },
@ -1344,9 +1348,9 @@ template< class KeyType, class ValueType, class CountType = size_t > struct Hash
return InsertFitted(key);
}
ValueType* InsertKeyValue(KeyType key, const ValueType& value)
ValueType* InsertKeyValue(KeyType key, ValueType& value)
{
ValueType* value_ptr = InsertKeyValue(key);
ValueType* value_ptr = InsertKey(key);
*value_ptr = value;
return value_ptr;
}
@ -1717,6 +1721,19 @@ public:
~SymbolStackTable();
};
// user declared functions
struct UserFunction {
const char* name;
const char* params;
const char* expression;
};
class UserFunctionMap : public HashTable<uint64_t, UserFunction*> {
public:
UserFunction *Get(strref name);
StatusCode Add(strref name, strref params, strref expresion);
~UserFunctionMap();
};
// The state of the assembler
class Asm {
public:
@ -1738,6 +1755,7 @@ public:
MapSymbolArray map;
SymbolStackTable symbolStacks; // enable push/pull of symbols
UserFunctionMap userFunctions; // user defined expression functions
// CPU target
struct mnem *opcode_table;
@ -1904,6 +1922,7 @@ public:
StatusCode Directive_Rept(strref line);
StatusCode Directive_Macro(strref line);
StatusCode Directive_String(strref line);
StatusCode Directive_Function(strref line);
StatusCode Directive_Undef(strref line);
StatusCode Directive_Include(strref line);
StatusCode Directive_Incbin(strref line, int skip=0, int len=0);
@ -2033,6 +2052,52 @@ SymbolStackTable::~SymbolStackTable()
}
UserFunction* UserFunctionMap::Get(strref name)
{
UserFunction** ret = GetValue(name.fnv1a_64());
if (ret) { return *ret; }
return nullptr;
}
StatusCode UserFunctionMap::Add(strref name, strref params, strref expresion)
{
if (!name || !expresion) { return ERROR_INCOMPLETE_FUNCTION; }
strl_t stringlen = name.get_len() + 1 + (params ? (params.get_len() + 1) : 0) + expresion.get_len() + 1;
UserFunction *func = (UserFunction*)calloc(1, sizeof(UserFunction) + stringlen);
char* strings = (char*)(func + 1);
func->name = strings;
memcpy(strings, name.get(), name.get_len());
strings[name.get_len()] = 0;
strings += name.get_len() + 1;
if (params) {
func->params = strings;
memcpy(strings, params.get(), params.get_len());
strings[params.get_len()] = 0;
strings += params.get_len() + 1;
}
func->expression = strings;
memcpy(strings, expresion.get(), expresion.get_len());
if (UserFunction** existing = GetValue(name.fnv1a_64())) {
free(*existing);
*existing = func;
} else {
InsertKeyValue(name.fnv1a_64(), func);
}
return STATUS_OK;
}
UserFunctionMap::~UserFunctionMap()
{
for (size_t i = 0; i < size; ++i) {
if (keys[i] && values[i]) {
free(values[i]);
values[i] = nullptr;
keys[i] = 0;
}
}
}
// Clean up work allocations
void Asm::Cleanup() {
@ -3479,6 +3544,14 @@ bool Asm::EvalFunction(strref function, strref& expression, int &value)
strref params = expRet.scoped_block_comment_skip();
params.trim_whitespace();
if (function.get_first() == '.') { ++function; }
// look up user defined function
if (UserFunction* user = userFunctions.Get(function)) {
value = 0;
return true;
}
// built-in function
for (int i = 0; i < nEvalFuncs; ++i) {
if (function.same_str(aEvalFunctions[i].name)) {
switch (aEvalFunctions[i].function) {
@ -4925,6 +4998,25 @@ StatusCode Asm::Directive_String(strref line)
return STATUS_OK;
}
StatusCode Asm::Directive_Function(strref line)
{
line.skip_whitespace();
strref function_name = line.split_label(), params;
line.skip_whitespace();
if (line.get_first() == '(') {
params = line.scoped_block_comment_skip();
params.trim_whitespace();
}
line.skip_whitespace();
userFunctions.Add(function_name, params, line);
return STATUS_OK;
}
StatusCode Asm::Directive_Undef(strref line)
{
strref name = line.split_range_trim(Merlin() ? label_end_char_range_merlin : label_end_char_range);
@ -5602,6 +5694,9 @@ StatusCode Asm::ApplyDirective(AssemblerDirective dir, strref line, strref sourc
case AD_STRING:
return Directive_String(line);
case AD_FUNCTION:
return Directive_Function(line);
case AD_UNDEF:
return Directive_Undef(line);
@ -7954,3 +8049,4 @@ int main(int argc, char **argv) {
}
return return_value;
}