Use SectionTypeInfo struct member functions for section type info

include/asm/section.hpp

@@ -42,6 +42,8 @@ struct Section {
 	std::deque<Patch> patches;
 	std::vector<uint8_t> data;
 
+	SectionTypeInfo const &typeInfo() const { return sectionTypeInfo[type]; }
+
 	uint32_t getID() const; // ID of the section in the object file (`UINT32_MAX` if none)
 	bool isSizeKnown() const;
 };

include/link/section.hpp

@@ -51,6 +51,8 @@ struct Section {
 	std::vector<Symbol *> symbols;
 	std::unique_ptr<Section> nextPiece; // The next fragment or union "piece" of this section
 
+	SectionTypeInfo const &typeInfo() const { return sectionTypeInfo[type]; }
+
 private:
 	// Template class for both const and non-const iterators over the "pieces" of this section
 	template<QualifiedEquivalent<Section> SectionT>

include/linkdefs.hpp

@@ -82,6 +82,13 @@ static constexpr uint8_t SECTTYPE_TYPE_MASK = 0b111;
 static constexpr uint8_t SECTTYPE_UNION_BIT = 7;
 static constexpr uint8_t SECTTYPE_FRAGMENT_BIT = 6;
 
+// Tells whether a section has data in its object file definition,
+// depending on type.
+static inline bool sectTypeHasData(SectionType type) {
+	assume(type != SECTTYPE_INVALID);
+	return type == SECTTYPE_ROM0 || type == SECTTYPE_ROMX;
+}
+
 enum FileStackNodeType {
 	NODE_REPT,
 	NODE_FILE,
@@ -90,31 +97,24 @@ enum FileStackNodeType {
 
 static constexpr uint8_t FSTACKNODE_QUIET_BIT = 7;
 
-// Nont-`const` members may be patched in RGBLINK depending on CLI flags
-extern struct SectionTypeInfo {
+// Non-`const` members may be patched in RGBLINK depending on CLI flags
+struct SectionTypeInfo {
 	std::string const name;
 	uint16_t const startAddr;
 	uint16_t size;
 	uint32_t const firstBank;
 	uint32_t lastBank;
-} sectionTypeInfo[SECTTYPE_INVALID];
 
-// Tells whether a section has data in its object file definition,
-// depending on type.
-static inline bool sectTypeHasData(SectionType type) {
-	assume(type != SECTTYPE_INVALID);
-	return type == SECTTYPE_ROM0 || type == SECTTYPE_ROMX;
-}
+	// Returns a memory region's end address (last byte), e.g. 0x7FFF
+	uint16_t endAddr() const { return startAddr + size - 1; }
 
-// Returns a memory region's end address (last byte), e.g. 0x7FFF
-static inline uint16_t sectTypeEndAddr(SectionType type) {
-	return sectionTypeInfo[type].startAddr + sectionTypeInfo[type].size - 1;
-}
+	// Returns a memory region's number of banks, or 1 for regions without banking
+	uint32_t nbBanks() const { return lastBank - firstBank + 1; }
 
-// Returns a memory region's number of banks, or 1 for regions without banking
-static inline uint32_t sectTypeBanks(SectionType type) {
-	return sectionTypeInfo[type].lastBank - sectionTypeInfo[type].firstBank + 1;
-}
+	bool isBanked() const { return nbBanks() != 1; }
+};
+
+extern SectionTypeInfo sectionTypeInfo[SECTTYPE_INVALID];
 
 enum SectionModifier { SECTION_NORMAL, SECTION_UNION, SECTION_FRAGMENT };
 

src/asm/section.cpp

@@ -100,7 +100,7 @@ void sect_ForEach(void (*callback)(Section &)) {
 
 void sect_CheckSizes() {
 	for (Section const &sect : sections) {
-		if (uint32_t maxSize = sectionTypeInfo[sect.type].size; sect.size > maxSize) {
+		if (uint32_t maxSize = sect.typeInfo().size; sect.size > maxSize) {
 			error(
 			    "Section \"%s\" grew too big (max size = 0x%" PRIX32 " bytes, reached 0x%" PRIX32
 			    ")",
@@ -309,7 +309,7 @@ static void mergeSections(
 				sectError(
 				    "Section \"%s\" already exists but with type `%s`",
 				    sect.name.c_str(),
-				    sectionTypeInfo[sect.type].name.c_str()
+				    sect.typeInfo().name.c_str()
 				);
 			}
 
@@ -377,8 +377,8 @@ static Section *createSection(
 	out_RegisterNode(sect.src);
 
 	// It is only needed to allocate memory for ROM sections.
-	if (sectTypeHasData(type)) {
-		sect.data.resize(sectionTypeInfo[type].size);
+	if (sectTypeHasData(sect.type)) {
+		sect.data.resize(sect.typeInfo().size);
 	}
 
 	return §
@@ -403,7 +403,7 @@ static Section *createSectionFragmentLiteral(Section const &parent) {
 
 	// Section fragment literals must be ROM sections.
 	assume(sectTypeHasData(sect.type));
-	sect.data.resize(sectionTypeInfo[sect.type].size);
+	sect.data.resize(sect.typeInfo().size);
 
 	return §
 }
@@ -424,24 +424,24 @@ static Section *getSection(
 	uint32_t alignMask = alignSize - 1;
 
 	// First, validate parameters, and normalize them if applicable
+	SectionTypeInfo const &typeInfo = sectionTypeInfo[type];
 
 	if (bank != UINT32_MAX) {
 		if (type != SECTTYPE_ROMX && type != SECTTYPE_VRAM && type != SECTTYPE_SRAM
 		    && type != SECTTYPE_WRAMX) {
 			error("`BANK` only allowed for `ROMX`, `WRAMX`, `SRAM`, or `VRAM` sections");
-		} else if (bank < sectionTypeInfo[type].firstBank
-		           || bank > sectionTypeInfo[type].lastBank) {
+		} else if (bank < typeInfo.firstBank || bank > typeInfo.lastBank) {
 			error(
 			    "%s bank value $%04" PRIx32 " out of range ($%04" PRIx32 " to $%04" PRIx32 ")",
-			    sectionTypeInfo[type].name.c_str(),
+			    typeInfo.name.c_str(),
 			    bank,
-			    sectionTypeInfo[type].firstBank,
-			    sectionTypeInfo[type].lastBank
+			    typeInfo.firstBank,
+			    typeInfo.lastBank
 			);
 		}
-	} else if (sectTypeBanks(type) == 1) {
+	} else if (!typeInfo.isBanked()) {
 		// If the section type only has a single bank, implicitly force it
-		bank = sectionTypeInfo[type].firstBank;
+		bank = typeInfo.firstBank;
 	}
 
 	// This should be redundant, as the parser guarantees that `AlignmentSpec` will be valid.
@@ -457,14 +457,14 @@ static Section *getSection(
 	}
 
 	if (org != UINT32_MAX) {
-		if (org < sectionTypeInfo[type].startAddr || org > sectTypeEndAddr(type)) {
+		if (org < typeInfo.startAddr || org > typeInfo.endAddr()) {
 			error(
 			    "Section \"%s\"'s fixed address $%04" PRIx32 " is outside of range [$%04" PRIx16
 			    "; $%04" PRIx16 "]",
 			    name.c_str(),
 			    org,
-			    sectionTypeInfo[type].startAddr,
-			    sectTypeEndAddr(type)
+			    typeInfo.startAddr,
+			    typeInfo.endAddr()
 			);
 		}
 	}
@@ -476,11 +476,11 @@ static Section *getSection(
 				error("Section \"%s\"'s fixed address does not match its alignment", name.c_str());
 			}
 			alignment = 0; // Ignore it if it's satisfied
-		} else if (sectionTypeInfo[type].startAddr & alignMask) {
+		} else if (typeInfo.startAddr & alignMask) {
 			error(
 			    "Section \"%s\"'s alignment cannot be attained in %s",
 			    name.c_str(),
-			    sectionTypeInfo[type].name.c_str()
+			    typeInfo.name.c_str()
 			);
 			alignment = 0; // Ignore it if it's unattainable
 			org = 0;

src/link/assign.cpp

@@ -79,7 +79,7 @@ static MemoryLocation getStartLocation(Section const &section) {
 	if (section.isBankFixed) {
 		location.bank = section.bank;
 	} else {
-		location.bank = sectionTypeInfo[section.type].firstBank;
+		location.bank = section.typeInfo().firstBank;
 
 		// Scramble the bank if applicable
 		if (options.scrambleROMX && section.type == SECTTYPE_ROMX) {
@@ -106,14 +106,14 @@ static MemoryLocation getStartLocation(Section const &section) {
 // Returns a suitable free space index into `memory[section->type]` at which to place the given
 // section, or `std::nullopt` if none was found.
 static std::optional<size_t> getPlacement(Section const &section, MemoryLocation &location) {
-	SectionTypeInfo const &typeInfo = sectionTypeInfo[section.type];
+	SectionTypeInfo const &typeInfo = section.typeInfo();
 
 	for (;;) {
 		if (location.bank < typeInfo.firstBank
 		    || location.bank >= memory[section.type].size() + typeInfo.firstBank) {
 			fatal(
 			    "Invalid bank for %s section \"%s\": %" PRIu32,
-			    sectionTypeInfo[section.type].name.c_str(),
+			    typeInfo.name.c_str(),
 			    section.name.c_str(),
 			    location.bank
 			);
@@ -217,9 +217,8 @@ static std::optional<size_t> getPlacement(Section const &section, MemoryLocation
 }
 
 static std::string getSectionDescription(Section const &section) {
-	std::string description =
-	    "\"" + section.name + "\" (" + sectionTypeInfo[section.type].name + " section) ";
-	if (section.isBankFixed && sectTypeBanks(section.type) != 1) {
+	std::string description = "\"" + section.name + "\" (" + section.typeInfo().name + " section) ";
+	if (section.isBankFixed && section.typeInfo().isBanked()) {
 		char bank[8];
 		snprintf(bank, sizeof(bank), "%02" PRIx32, section.bank);
 		if (section.isAddressFixed) {
@@ -253,14 +252,15 @@ static std::string getSectionDescription(Section const &section) {
 // Places a section in a suitable location, or error out if it fails to.
 // Due to the implemented algorithm, this should be called with sections of decreasing size!
 static void placeSection(Section &section) {
+	SectionTypeInfo const &typeInfo = section.typeInfo();
+
 	// Specially handle 0-byte SECTIONs, as they can't overlap anything
 	if (section.size == 0) {
 		// Unless the SECTION's address was fixed, the starting address
 		// is fine for any alignment, as checked in sect_DoSanityChecks.
 		MemoryLocation location = {
-		    .address =
-		        section.isAddressFixed ? section.org : sectionTypeInfo[section.type].startAddr,
-		    .bank = section.isBankFixed ? section.bank : sectionTypeInfo[section.type].firstBank,
+		    .address = section.isAddressFixed ? section.org : typeInfo.startAddr,
+		    .bank = section.isBankFixed ? section.bank : typeInfo.firstBank,
 		};
 		assignSection(section, location);
 		return;
@@ -270,8 +270,7 @@ static void placeSection(Section &section) {
 	// https://en.wikipedia.org/wiki/Bin_packing_problem#First-fit_algorithm
 	MemoryLocation location = getStartLocation(section);
 	if (std::optional<size_t> spaceIdx = getPlacement(section, location); spaceIdx) {
-		std::deque<FreeSpace> &bankMem =
-		    memory[section.type][location.bank - sectionTypeInfo[section.type].firstBank];
+		std::deque<FreeSpace> &bankMem = memory[section.type][location.bank - typeInfo.firstBank];
 		FreeSpace &freeSpace = bankMem[*spaceIdx];
 
 		assignSection(section, location);
@@ -308,13 +307,14 @@ static void placeSection(Section &section) {
 	if (!section.isBankFixed || !section.isAddressFixed) {
 		// If a section failed to go to several places, nothing we can report
 		fatal("Unable to place %s", getSectionDescription(section).c_str());
-	} else if (section.org + section.size > sectTypeEndAddr(section.type) + 1) {
+	} else if (uint16_t onePastEnd = typeInfo.endAddr() + 1;
+	           section.org + section.size > onePastEnd) {
 		// If the section just can't fit the bank, report that
 		fatal(
 		    "Unable to place %s: section runs past end of region ($%04x > $%04x)",
 		    getSectionDescription(section).c_str(),
 		    section.org + section.size,
-		    sectTypeEndAddr(section.type) + 1
+		    onePastEnd
 		);
 	} else {
 		// Otherwise there is overlap with another section
@@ -430,11 +430,12 @@ void assign_AssignSections() {
 
 	// Initialize the free space-modelling structs
 	for (SectionType type : EnumSeq(SECTTYPE_INVALID)) {
-		memory[type].resize(sectTypeBanks(type));
+		SectionTypeInfo const &typeInfo = sectionTypeInfo[type];
+		memory[type].resize(typeInfo.nbBanks());
 		for (std::deque<FreeSpace> &bankMem : memory[type]) {
 			bankMem.push_back({
-			    .address = sectionTypeInfo[type].startAddr,
-			    .size = sectionTypeInfo[type].size,
+			    .address = typeInfo.startAddr,
+			    .size = typeInfo.size,
 			});
 		}
 	}

src/link/layout.cpp

@@ -31,7 +31,7 @@ static void setActiveTypeAndIdx(SectionType type, uint32_t idx) {
 }
 
 void layout_SetFloatingSectionType(SectionType type) {
-	if (sectTypeBanks(type) == 1) {
+	if (!sectionTypeInfo[type].isBanked()) {
 		// There is only a single bank anyway, so just set the index to 0.
 		setActiveTypeAndIdx(type, 0);
 	} else {
@@ -46,8 +46,8 @@ void layout_SetFloatingSectionType(SectionType type) {
 }
 
 void layout_SetSectionType(SectionType type) {
-	if (sectTypeBanks(type) != 1) {
-		scriptError("A bank number must be specified for %s", sectionTypeInfo[type].name.c_str());
+	if (SectionTypeInfo const &typeInfo = sectionTypeInfo[type]; typeInfo.isBanked()) {
+		scriptError("A bank number must be specified for %s", typeInfo.name.c_str());
 		// Keep going with a default value for the bank index.
 	}
 
@@ -88,22 +88,22 @@ void layout_SetAddr(uint32_t addr) {
 		return;
 	}
 
-	uint16_t &pc = curAddr[activeType][activeBankIdx];
 	SectionTypeInfo const &typeInfo = sectionTypeInfo[activeType];
 
-	if (addr < pc) {
+	if (uint16_t &pc = curAddr[activeType][activeBankIdx]; addr < pc) {
 		scriptError("Cannot decrease the current address (from $%04x to $%04x)", pc, addr);
-	} else if (addr > sectTypeEndAddr(activeType)) { // Allow "one past the end" sections.
+	} else if (addr > typeInfo.endAddr()) { // Allow "one past the end" sections.
 		scriptError(
 		    "Cannot set the current address to $%04" PRIx32 ": %s ends at $%04" PRIx16,
 		    addr,
 		    typeInfo.name.c_str(),
-		    sectTypeEndAddr(activeType)
+		    typeInfo.endAddr()
 		);
-		pc = sectTypeEndAddr(activeType);
+		pc = typeInfo.endAddr();
 	} else {
 		pc = addr;
 	}
+
 	isPcFloating = false;
 }
 
@@ -182,7 +182,7 @@ void layout_AlignTo(uint32_t alignment, uint32_t alignOfs) {
 		    ", past $%04" PRIx16,
 		    pc,
 		    static_cast<uint16_t>(pc + length),
-		    static_cast<uint16_t>(sectTypeEndAddr(activeType) + 1)
+		    static_cast<uint16_t>(typeInfo.endAddr() + 1)
 		);
 		return;
 	}
@@ -212,7 +212,7 @@ void layout_Pad(uint32_t length) {
 		    "Cannot increase the current address by %u bytes: only %u bytes to $%04" PRIx16,
 		    length,
 		    typeInfo.size - offset,
-		    static_cast<uint16_t>(sectTypeEndAddr(activeType) + 1)
+		    static_cast<uint16_t>(typeInfo.endAddr() + 1)
 		);
 	} else {
 		pc += length;

src/link/output.cpp

@@ -71,7 +71,7 @@ void out_AddSection(Section const &section) {
 	    1,          // SECTTYPE_OAM
 	};
 
-	uint32_t targetBank = section.bank - sectionTypeInfo[section.type].firstBank;
+	uint32_t targetBank = section.bank - section.typeInfo().firstBank;
 	if (targetBank >= maxNbBanks[section.type]) {
 		fatal(
 		    "Section \"%s\" has an invalid bank range (%" PRIu32 " > %" PRIu32 ")",
@@ -96,7 +96,7 @@ void out_AddSection(Section const &section) {
 }
 
 Section const *out_OverlappingSection(Section const &section) {
-	uint32_t bank = section.bank - sectionTypeInfo[section.type].firstBank;
+	uint32_t bank = section.bank - section.typeInfo().firstBank;
 
 	for (Section const *ptr : sections[section.type][bank].sections) {
 		if (ptr->org < section.org + section.size && section.org < ptr->org + ptr->size) {
@@ -491,12 +491,10 @@ static void writeMapBank(SortedSections const &sectList, SectionType type, uint3
 	if (used == 0) {
 		fputs("\tEMPTY\n", mapFile);
 	} else {
-		uint16_t bankEndAddr = sectionTypeInfo[type].startAddr + sectionTypeInfo[type].size;
-
+		uint16_t bankEndAddr = sectionTypeInfo[type].endAddr() + 1;
 		writeEmptySpace(prevEndAddr, bankEndAddr);
 
 		uint16_t slack = sectionTypeInfo[type].size - used;
-
 		fprintf(mapFile, "\tTOTAL EMPTY: $%04" PRIx16 " byte%s\n", slack, slack == 1 ? "" : "s");
 	}
 }
@@ -513,13 +511,12 @@ static void writeMapSummary() {
 			continue;
 		}
 
-		// Do not output unused section types
+		// Skip types which haven't been used at all.
 		if (nbBanks == 0) {
 			continue;
 		}
 
 		uint32_t usedTotal = 0;
-
 		for (uint32_t bank = 0; bank < nbBanks; ++bank) {
 			usedTotal += forEachSection(sections[type][bank], [](Section const &) {});
 		}
@@ -532,7 +529,7 @@ static void writeMapSummary() {
 		    usedTotal == 1 ? "" : "s",
 		    static_cast<size_t>(nbBanks) * sectionTypeInfo[type].size - usedTotal
 		);
-		if (sectionTypeInfo[type].firstBank != sectionTypeInfo[type].lastBank) {
+		if (sectionTypeInfo[type].isBanked()) {
 			fprintf(mapFile, " in %u bank%s", nbBanks, nbBanks == 1 ? "" : "s");
 		}
 		putc('\n', mapFile);

src/link/section.cpp

@@ -254,18 +254,20 @@ static void doSanityChecks(Section &section) {
 		section.isAlignFixed = false;
 	}
 
+	// The section's type is determined now, so we can get its type info
+	SectionTypeInfo const &typeInfo = section.typeInfo();
+
 	// Too large an alignment may not be satisfiable
-	if (section.isAlignFixed && (section.alignMask & sectionTypeInfo[section.type].startAddr)) {
+	if (section.isAlignFixed && (section.alignMask & typeInfo.startAddr)) {
 		error(
 		    "Section \"%s\" has type `%s`, which cannot be aligned to $%04x bytes",
 		    section.name.c_str(),
-		    sectionTypeInfo[section.type].name.c_str(),
+		    typeInfo.name.c_str(),
 		    section.alignMask + 1
 		);
 	}
 
-	uint32_t minbank = sectionTypeInfo[section.type].firstBank,
-	         maxbank = sectionTypeInfo[section.type].lastBank;
+	uint32_t minbank = typeInfo.firstBank, maxbank = typeInfo.lastBank;
 
 	if (!bankModeError && section.isBankFixed
 	    && (section.bank < minbank || section.bank > maxbank)) {
@@ -282,12 +284,12 @@ static void doSanityChecks(Section &section) {
 	}
 
 	// Check if section has a chance to be placed
-	if (section.size > sectionTypeInfo[section.type].size) {
+	if (section.size > typeInfo.size) {
 		error(
 		    "Section \"%s\" is bigger than the max size for that type: $%" PRIx16 " > $%" PRIx16,
 		    section.name.c_str(),
 		    section.size,
-		    sectionTypeInfo[section.type].size
+		    typeInfo.size
 		);
 	}
 
@@ -311,24 +313,23 @@ static void doSanityChecks(Section &section) {
 		}
 
 		// Ensure the target address is valid
-		if (section.org < sectionTypeInfo[section.type].startAddr
-		    || section.org > sectTypeEndAddr(section.type)) {
+		if (section.org < typeInfo.startAddr || section.org > typeInfo.endAddr()) {
 			error(
 			    "Section \"%s\"'s fixed address $%04" PRIx16 " is outside of range [$%04" PRIx16
 			    "; $%04" PRIx16 "]",
 			    section.name.c_str(),
 			    section.org,
-			    sectionTypeInfo[section.type].startAddr,
-			    sectTypeEndAddr(section.type)
+			    typeInfo.startAddr,
+			    typeInfo.endAddr()
 			);
 		}
 
-		if (section.org + section.size > sectTypeEndAddr(section.type) + 1) {
+		if (section.org + section.size > typeInfo.endAddr() + 1) {
 			error(
 			    "Section \"%s\"'s end address $%04x is greater than last address $%04x",
 			    section.name.c_str(),
 			    section.org + section.size,
-			    sectTypeEndAddr(section.type) + 1
+			    typeInfo.endAddr() + 1
 			);
 		}
 	}