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Avoid being thrown by looping BASIC.

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This commit is contained in:
Thomas Harte 2024-12-05 17:28:47 -05:00
parent e835b2c68c
commit 48c0ae8fe4
1 changed files with 18 additions and 3 deletions
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21
Analyser/Static/Commodore/StaticAnalyser.cpp
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@ -84,6 +84,7 @@ std::optional<BASICAnalysis> analyse(const File &file) {
// a machine code entry point.
BASICAnalysis analysis;
std::set<uint16_t> visited_lines;
while(true) {
// Analysis has failed if there isn't at least one complete BASIC line from here.
if(size_t(line_address - file.starting_address) + 5 >= file.data.size()) {
@ -120,7 +121,10 @@ std::optional<BASICAnalysis> analyse(const File &file) {
}
}
if(!next_line_address) {
// Exit if a formal end of the program has been declared or if, as some copy protections do,
// the linked list of line contents has been made circular.
visited_lines.insert(line_number);
if(!next_line_address || visited_lines.find(next_line_address) != visited_lines.end()) {
break;
}
@ -182,14 +186,25 @@ Analyser::Static::TargetList Analyser::Static::Commodore::GetTargets(
if(analysis && !analysis->machine_code_addresses.empty()) {
string_stream << "1";
// Disassemble.
const auto disassembly = Analyser::Static::MOS6502::Disassemble(
file.data,
Analyser::Static::Disassembler::OffsetMapper(file.starting_address),
analysis->machine_code_addresses
);
// TODO: disassemble.
printf("");
// Very dumb check: if FF3E or FF3F were touched, this is for the +4.
for(const auto address: {0xff3e, 0xff3f}) {
for(const auto &collection: {
disassembly.external_loads,
disassembly.external_stores,
disassembly.external_modifies
}) {
if(collection.find(uint16_t(address)) != collection.end()) {
target->machine = Machine::Plus4; // TODO: use a better target?
}
}
}
}
string_stream << "\nRUN\n";