Fix unresolving `std::terminate()`

Fortune for hexview's current commit: Small blessing − 小吉

.gitignore

@@ -1,6 +1,8 @@
 *~
 test*
 obj/
-hexview
-hexview-pgo
+hexview-*
 profile/
+
+perf.*
+flamegraph.svg

Makefile

@@ -1,14 +1,18 @@
 SRC=$(wildcard src/*.cpp)
 INCLUDE =include
+
 _HX_FEAT?= -DFIXED_ROW_SIZE=24
 
-CXXFLAGS?= -pipe -O3 -march=native
-CXXFLAGS+= -flto -felide-constructors -fgraphite -fno-strict-aliasing -fno-exceptions -fomit-frame-pointer -fmerge-all-constants -fmodulo-sched -funswitch-loops -fsplit-loops
-CXXFLAGS+= -Wall -pedantic --std=gnu++20 $(addprefix -I,$(INCLUDE))
-LDFLAGS?= -O3 -flto
-LDFLAGS+= -lfmt
+CXXFLAGS_COMMON = -Wall -pedantic --std=gnu++20 $(addprefix -I,$(INCLUDE)) -felide-constructors -fno-strict-aliasing -fno-exceptions
+LDFLAGS_COMMON = -lfmt
+
+CXXFLAGS_DEFAULT = -pipe -O3 -march=native -fgraphite -flto
+CXXFLAGS_RELEASE =  -fomit-frame-pointer -fmerge-all-constants -fmodulo-sched -funswitch-loops -fsplit-loops
+LDFLAGS_DEFAULT =  -O3 -flto
+
+CXXFLAGS_DEBUG = -DDEBUG -O0 -g
 
-PROJ = hexview
+PROJECT = hexview
 
 OBJ = $(addprefix obj/,$(SRC:.cpp=.o))
 
@@ -24,8 +28,14 @@ PROF_FLAGS = -fprofile-generate
 
 ###
 
-.PHONY: all
-all: | dirs $(PROJ)
+.PHONY: release
+release: | dirs $(PROJECT)-release
+
+.PHONY: debug
+debug: | dirs $(PROJECT)-debug
+
+.PHONY: pgo
+pgo: | dirs $(PROJECT)-pgo
 
 dirs:
 	@mkdir -p obj/src
@@ -37,38 +47,62 @@ obj/%.o: %.cpp
 profile/%.o: %.cpp
 	$(CXX) -c $< $(_HX_FEAT) $(CXXFLAGS) $(PROF_FLAGS) -o $@ $(LDFLAGS) $(PROF_FLAGS)
 
-$(PROJ): $(OBJ)
+$(PROJECT)-release: CXXFLAGS?= $(CXXFLAGS_DEFAULT)
+$(PROJECT)-release: LDFLAGS?=  $(LDFLAGS_DEFAULT)
+$(PROJECT)-release: CXXFLAGS+= $(CXXFLAGS_COMMON)
+$(PROJECT)-release: CXXFLAGS+= $(CXXFLAGS_RELEASE)
+$(PROJECT)-release: LDFLAGS := $(LDFLAGS_COMMON) $(LDFLAGS)
+$(PROJECT)-release: $(OBJ)
 	$(CXX) $^ $(CXXFLAGS) -o $@ $(LDFLAGS)
 	strip $@
 
+
+$(PROJECT)-debug: CXXFLAGS += $(CXXFLAGS_COMMON) 
+$(PROJECT)-debug: CXXFLAGS += $(CXXFLAGS_DEBUG)
+$(PROJECT)-debug: LDFLAGS += $(LDFLAGS_COMMON)
+$(PROJECT)-debug: $(OBJ)
+	$(CXX) $^ $(CXXFLAGS) -o $@ $(LDFLAGS)
+
 pgo-generate: $(PGO_OBJ)
 	$(CXX) $^ $(CXXFLAGS) $(PROF_FLAGS) -o $@ $(LDFLAGS) $(PROF_FLAGS)
 
-pgo-profile: pgo-generate
+pgo-reset:
+	find ./profile -name \*.gcda -exec rm {} +
+
+pgo-profile: | pgo-reset pgo-generate
 	for i in {1..$(PGO_ITERATIONS)}; do \
-		dd if=/dev/urandom of=./pgo-test bs=1024 count=$(PGO_DATASET_SIZE) >> /dev/null 2>&1; \
+		dd if=/dev/urandom of=/tmp/$(PROJECT)-pgo-test bs=1024 count=$(PGO_DATASET_SIZE) >> /dev/null 2>&1; \
 		printf "\rIteration $$i / $(PGO_ITERATIONS)"; \
-		./pgo-generate ./pgo-test > ./pgo-output; \
+		./pgo-generate /tmp/$(PROJECT)-pgo-test > /tmp/$(PROJECT)-pgo-output; \
 	done
 	@echo ""
-	rm ./pgo-test
-	rm ./pgo-output
+	rm /tmp/$(PROJECT)-pgo-test
+	rm /tmp/$(PROJECT)-pgo-output
 	rm pgo-generate
 
 
-pgo-use: PROF_FLAGS = -fprofile-use -lgcov
+pgo-use: CXXFLAGS?= $(CXXFLAGS_DEFAULT)
+pgo-use: LDFLAGS?=  $(LDFLAGS_DEFAULT)
+pgo-use: CXXFLAGS+= $(CXXFLAGS_COMMON)
+pgo-use: CXXFLAGS+= $(CXXFLAGS_RELEASE)
+pgo-use: LDFLAGS := $(LDFLAGS_COMMON) -lgcov $(LDFLAGS)
+pgo-use: PROF_FLAGS = -fprofile-use
 pgo-use: $(PGO_OBJ)
 	$(CXX) $^ $(CXXFLAGS) $(PROF_FLAGS) -o $@ $(LDFLAGS) $(PROF_FLAGS)
 
-$(PROJ)-pgo: | dirs pgo-profile
+$(PROJECT)-pgo: CXXFLAGS?= $(CXXFLAGS_DEFAULT)
+$(PROJECT)-pgo: LDFLAGS?=  $(LDFLAGS_DEFAULT)
+$(PROJECT)-pgo: CXXFLAGS+= $(CXXFLAGS_COMMON)
+$(PROJECT)-pgo: CXXFLAGS+= $(CXXFLAGS_RELEASE)
+$(PROJECT)-pgo: LDFLAGS := $(LDFLAGS_COMMON) $(LDFLAGS)
+$(PROJECT)-pgo: | dirs pgo-profile
 	find ./profile -name \*.o -exec rm {} +
 	$(MAKE) pgo-use
 	mv pgo-use $@
 	strip $@
 
 clean:
-	rm -f $(PROJ)
-	rm -f $(PROJ)-pgo
+	rm -f $(PROJECT)-{release,debug,pgo}
 	rm -rf obj
 	rm -rf profile
 	rm -f pgo-{test,output,generate}

include/hex.hpp

@@ -5,4 +5,42 @@
 namespace hv {
   /// Print a single screen
   void print_screen(const span<unsigned char> bytes, unsigned long offset);
+
+  inline void lookup_hex_string(std::uint64_t x, char* s)
+  {
+    static const char digits[513] =
+      "000102030405060708090a0b0c0d0e0f"
+      "101112131415161718191a1b1c1d1e1f"
+      "202122232425262728292a2b2c2d2e2f"
+      "303132333435363738393a3b3c3d3e3f"
+      "404142434445464748494a4b4c4d4e4f"
+      "505152535455565758595a5b5c5d5e5f"
+      "606162636465666768696a6b6c6d6e6f"
+      "707172737475767778797a7b7c7d7e7f"
+      "808182838485868788898a8b8c8d8e8f"
+      "909192939495969798999a9b9c9d9e9f"
+      "a0a1a2a3a4a5a6a7a8a9aaabacadaeaf"
+      "b0b1b2b3b4b5b6b7b8b9babbbcbdbebf"
+      "c0c1c2c3c4c5c6c7c8c9cacbcccdcecf"
+      "d0d1d2d3d4d5d6d7d8d9dadbdcdddedf"
+      "e0e1e2e3e4e5e6e7e8e9eaebecedeeef"
+      "f0f1f2f3f4f5f6f7f8f9fafbfcfdfeff";
+    int i = 7;
+    const char *lut = (const char *)digits;
+    while (i >= 0)
+      {
+	int pos = (x & 0xFF) * 2;
+	char ch = lut[pos];
+#ifdef DEBUG
+	if ( (i*2+1) >=16) std::terminate();
+#endif
+	s[i * 2] = ch;
+
+	ch = lut[pos + 1];
+	s[i * 2 + 1] = ch;
+
+	x >>= 8;
+	i -= 1;
+      }
+  }
 }

include/span.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <exception>
 #include <cstdint>
 #include <cmath>
 
@@ -20,14 +21,14 @@ namespace hv
     inline T& operator[](std::size_t index)
     {
 #ifdef DEBUG
-      if (index>=len) throw "tried to index out of bounds of array";
+      if (index>=len) std::terminate(); // "tried to index out of bounds of array";
 #endif
       return ptr[index];
     }
     inline const T& operator[](std::size_t index) const
     {
 #ifdef DEBUG
-      if (index>=len) throw "tried to index out of bounds of array";
+      if (index>=len) std::terminate(); // "tried to index out of bounds of array";
 #endif
       return ptr[index];
     }
@@ -35,12 +36,12 @@ namespace hv
     inline span<T> slice(std::size_t off, std::size_t len)
     {
       len = std::min(this->len, len);
-      if(len+off>=len || len < off) throw "tried to index out of bounds of array";
+      if(len+off>=len || len < off) std::terminate(); // "tried to index out of bounds of array";
       return span<T>(ptr+off, len-off);
     }
     inline span<T> slice(std::size_t off)
     {
-      if(len+off>=len || len < off) throw "tried to index out of bounds of array";
+      if(len+off>=len || len < off) std::terminate(); // "tried to index out of bounds of array";
       
       return span<T>(ptr+off, len-off);
     }

src/hex.cpp

@@ -1,5 +1,6 @@
 #include <fmt/format.h>
 #include <span.hpp>
+#include <hex.hpp>
 
 const static constexpr char ascii_map[256] = {
   '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', 
@@ -20,7 +21,7 @@ const static constexpr char ascii_map[256] = {
   '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', 
 };
 
-constexpr const char* hex_map[256] = {
+constexpr const static char* hex_map[256] = {
 	"00", "01", "02", "03", "04", "05", "06", "07", "08", "09", "0a", "0b", "0c", "0d", "0e", "0f",
 	"10", "11", "12", "13", "14", "15", "16", "17", "18", "19", "1a", "1b", "1c", "1d", "1e", "1f",
 	"20", "21", "22", "23", "24", "25", "26", "27", "28", "29", "2a", "2b", "2c", "2d", "2e", "2f",
@@ -59,52 +60,80 @@ inline void hex02(std::uint8_t byte, char buffer[2])
 	buffer[1] =hex_map[byte][1];
 }
 
-template<int N>
+template<std::size_t N>
+inline __attribute__((always_inline)) void print_exact(const char* ar)
+{
+	fwrite(ar, 1, N, stdout);
+}
+
+template<std::size_t N>
 inline __attribute__((always_inline)) void print_exact(const char (&ar)[N])
 {
 	fwrite(ar, N, 1, stdout);
 }
 
+inline static void u64_to_hex(std::uint64_t num, char* s)
+{
+	hv::lookup_hex_string(num, s);
+}
+
 namespace hv {
 	void print_screen(const span<unsigned char> memory, unsigned long offset)
 	{
 #ifndef FIXED_ROW_SIZE
-#define S (const char*)
+#define S (2+ROW_SZ)
+#define P_EX(n, buf) fwrite(buf, 1, n, stdout)
 		int ROW_SZ = 24;
 #else
 #define S
+#define P_EX(n, buf) print_exact(buf)
 #endif
-		fmt::print("0x{:016x}  ", offset);
-		char hxbuf[3];
+		char posbuf[3 + 16 + 2];
+		posbuf[0] = '\n';
+		posbuf[1] = '0';
+		posbuf[2] = 'x';
+#ifdef DEBUG
+		std::memset(posbuf+3, '0', 16);
+#endif
+		posbuf[3 + 16] = ' ';
+		posbuf[3 + 16 + 1] = ' ';
+
+		u64_to_hex(offset, posbuf+3);
+		prints(posbuf+1);
+
+		char hxbuf[3] = { ' ', ' ', ' ' };
 		std::size_t i=0;
 		char r_ascii[2 + ROW_SZ];
 		r_ascii[0] = ' ';
 		r_ascii[1] = ' ';
 		char* ascii = r_ascii + 2;
+		const auto memsize = memory.size();
 			
-		hxbuf[2] = ' ';
-		for(;i<memory.size();i++) {
+		for(;i<memsize;i++) {
 			if (i && i % ROW_SZ == 0) { //TODO: Change to i +=16 so we don't have to branch here on every byte. Make sure to not overrun buffer tho
-				print_exact(r_ascii);
-				fmt::print("\n0x{:016x}  ", i+offset);
+				P_EX(S, r_ascii);
+
+				u64_to_hex(i+offset, posbuf+3);
+				print_exact(posbuf);
 			}
 			unsigned char idx = memory[i];
 			hex02(idx, hxbuf);
 			print_exact(hxbuf);
+
 			ascii[i%ROW_SZ] = ascii_map[idx];
 		}
-		if (memory.size() % ROW_SZ != 0)
+		if (memsize % ROW_SZ != 0)
 		{
-			auto rest = memory.size() % ROW_SZ;
+			auto rest = memsize % ROW_SZ;
 			ascii[rest] = 0;
 			constexpr const char output[3] = { ' ', ' ', ' ' };
 			for(std::size_t j=0;j< ROW_SZ - rest;j++)
 				print_exact(output);
 
-			prints(r_ascii);
+			prints((const char*) r_ascii);
 		}
 		else {
-			print_exact(r_ascii);
+			P_EX(S, r_ascii);
 		}
 	}
 }