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Fix "while expanding symbol" error message

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Fixes #1771
This commit is contained in:
Rangi42
2025-08-01 16:25:44 -04:00
parent ee1aed51d8
commit b51056f743
8 changed files with 157 additions and 161 deletions
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33
src/asm/lexer.cpp
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@@ -518,9 +518,7 @@ static uint32_t readDecimalNumber(int initial);
static uint32_t readBracketedMacroArgNum() {
bool disableExpansions = lexerState->disableExpansions;
lexerState->disableExpansions = false;
Defer restoreExpansions{[&] {
lexerState->disableExpansions = disableExpansions;
}};
Defer restoreExpansions{[&] { lexerState->disableExpansions = disableExpansions; }};
int32_t num = 0;
int c = peek();
@@ -704,7 +702,7 @@ int LexerState::peekCharAhead() {
}
// Forward declarations for `peek`
static std::shared_ptr<std::string> readInterpolation(size_t depth);
static std::pair<Symbol const *, std::shared_ptr<std::string>> readInterpolation(size_t depth);
static int peek() {
int c = lexerState->peekChar();
@@ -739,8 +737,8 @@ static int peek() {
} else if (c == '{') {
// If character is an open brace, do symbol interpolation
shiftChar();
if (std::shared_ptr<std::string> str = readInterpolation(0); str) {
beginExpansion(str, *str);
if (auto interp = readInterpolation(0); interp.first && interp.second) {
beginExpansion(interp.second, interp.first->name);
}
return peek(); // Tail recursion
@@ -824,9 +822,7 @@ static void handleCRLF(int c) {
static auto scopedDisableExpansions() {
lexerState->disableExpansions = true;
return Defer{[&] {
lexerState->disableExpansions = false;
}};
return Defer{[&] { lexerState->disableExpansions = false; }};
}
// "Services" provided by the lexer to the rest of the program
@@ -1219,7 +1215,7 @@ static Token readIdentifier(char firstChar, bool raw) {
// Functions to read strings
static std::shared_ptr<std::string> readInterpolation(size_t depth) {
static std::pair<Symbol const *, std::shared_ptr<std::string>> readInterpolation(size_t depth) {
if (depth > options.maxRecursionDepth) {
fatal("Recursion limit (%zu) exceeded", options.maxRecursionDepth);
}
@@ -1231,8 +1227,8 @@ static std::shared_ptr<std::string> readInterpolation(size_t depth) {
// Use `consumeChar()` since `peek()` might expand nested interpolations and recursively
// call `readInterpolation()`, which can cause stack overflow.
if (consumeChar('{')) {
if (std::shared_ptr<std::string> str = readInterpolation(depth + 1); str) {
beginExpansion(str, *str);
if (auto interp = readInterpolation(depth + 1); interp.first && interp.second) {
beginExpansion(interp.second, interp.first->name);
}
continue; // Restart, reading from the new buffer
} else if (int c = peek(); c == EOF || c == '\r' || c == '\n' || c == '"') {
@@ -1267,7 +1263,7 @@ static std::shared_ptr<std::string> readInterpolation(size_t depth) {
"symbol",
fmtBuf.c_str()
);
return nullptr;
return {nullptr, nullptr};
}
if (Symbol const *sym = sym_FindScopedValidSymbol(fmtBuf); !sym || !sym->isDefined()) {
@@ -1276,18 +1272,19 @@ static std::shared_ptr<std::string> readInterpolation(size_t depth) {
} else {
error("Interpolated symbol \"%s\" does not exist", fmtBuf.c_str());
}
return {sym, nullptr};
} else if (sym->type == SYM_EQUS) {
auto buf = std::make_shared<std::string>();
fmt.appendString(*buf, *sym->getEqus());
return buf;
return {sym, buf};
} else if (sym->isNumeric()) {
auto buf = std::make_shared<std::string>();
fmt.appendNumber(*buf, sym->getConstantValue());
return buf;
return {sym, buf};
} else {
error("Interpolated symbol \"%s\" is not a numeric or string symbol", fmtBuf.c_str());
return {sym, nullptr};
}
return nullptr;
}
static void appendExpandedString(std::string &str, std::string const &expanded) {
@@ -1334,8 +1331,8 @@ static void appendCharInLiteral(std::string &str, int c) {
if (c == '{') {
// We'll be exiting the string/character scope, so re-enable expansions
lexerState->disableExpansions = false;
if (std::shared_ptr<std::string> interpolation = readInterpolation(0); interpolation) {
appendExpandedString(str, *interpolation);
if (auto interp = readInterpolation(0); interp.second) {
appendExpandedString(str, *interp.second);
}
lexerState->disableExpansions = true;
return;