Fix unresolving `std::terminate()`

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

.gitignore

@@ -1,4 +1,8 @@
 *~
-build/
 test*
 obj/
+hexview-*
+profile/
+
+perf.*
+flamegraph.svg

Makefile

@@ -1,26 +1,108 @@
 SRC=$(wildcard src/*.cpp)
 INCLUDE =include
-CXXFLAGS = -Wall -pedantic --std=gnu++20 $(addprefix -I,$(INCLUDE))
-CXXFLAGS+= -flto -felide-constructors -fgraphite -O3
-LDFLAGS = -lfmt -O3 -flto 
 
-PROJ = hexview
+_HX_FEAT?= -DFIXED_ROW_SIZE=24
+
+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
+
+PROJECT = hexview
 
 OBJ = $(addprefix obj/,$(SRC:.cpp=.o))
 
-.PHONY: all
-all: dirs $(PROJ)
+### PGO target specific ###
+
+# Number of times to run profiling
+PGO_ITERATIONS = 512
+# Size in kb of training files
+PGO_DATASET_SIZE = $$(( 1024 * 4 ))
+
+PGO_OBJ = $(addprefix profile/,$(SRC:.cpp=.o))
+PROF_FLAGS = -fprofile-generate
+
+###
+
+.PHONY: release
+release: | dirs $(PROJECT)-release
+
+.PHONY: debug
+debug: | dirs $(PROJECT)-debug
+
+.PHONY: pgo
+pgo: | dirs $(PROJECT)-pgo
 
 dirs:
 	@mkdir -p obj/src
+	@mkdir -p profile/src
 
 obj/%.o: %.cpp
-	$(CXX) -c $< $(CXXFLAGS) -o $@ $(LDFLAGS)
+	$(CXX) -c $< $(_HX_FEAT) $(CXXFLAGS) -o $@ $(LDFLAGS)
+
+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) $(PROF_FLAGS)
+
+pgo-reset:
+	find ./profile -name \*.gcda -exec rm {} +
+
+pgo-profile: | pgo-reset pgo-generate
+	for i in {1..$(PGO_ITERATIONS)}; do \
+		dd if=/dev/urandom of=/tmp/$(PROJECT)-pgo-test bs=1024 count=$(PGO_DATASET_SIZE) >> /dev/null 2>&1; \
+		printf "\rIteration $$i / $(PGO_ITERATIONS)"; \
+		./pgo-generate /tmp/$(PROJECT)-pgo-test > /tmp/$(PROJECT)-pgo-output; \
+	done
+	@echo ""
+	rm /tmp/$(PROJECT)-pgo-test
+	rm /tmp/$(PROJECT)-pgo-output
+	rm pgo-generate
+
+
+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) $(PROF_FLAGS)
+
+$(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 $(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/memory-map.hpp

@@ -25,12 +25,12 @@ namespace hv
 
     inline byte& operator[](std::size_t index)
     {
-      if (index>=size) throw "tried to index out of bounds of map";
+      if (index>=size) std::terminate();
       return ((byte*)block0)[index];
     }
     inline const byte& operator[](std::size_t index) const
     {
-      if (index>=size) throw "tried to index out of bounds of map";
+      if (index>=size) std::terminate();
       return ((byte*)block0)[index];
     }
 
@@ -64,7 +64,7 @@ namespace hv
 
     inline const byte& operator[](std::size_t index) const
     {
-      if (index>=size) throw "tried to index out of bounds of map";
+      if (index>=size) std::terminate();
       return ((byte*)block0)[index];
     }
     

include/span.hpp

@@ -1,5 +1,6 @@
 #pragma once
 
+#include <exception>
 #include <cstdint>
 #include <cmath>
 
@@ -19,24 +20,28 @@ namespace hv
     
     inline T& operator[](std::size_t index)
     {
-      if (index>=len) throw "tried to index out of bounds of array";
+#ifdef DEBUG
+      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
     {
-      if (index>=len) throw "tried to index out of bounds of array";
+#ifdef DEBUG
+      if (index>=len) std::terminate(); // "tried to index out of bounds of array";
+#endif
       return ptr[index];
     }
 
     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] = {
   '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', '.', 
@@ -20,43 +21,119 @@ const static constexpr char ascii_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",
+	"30", "31", "32", "33", "34", "35", "36", "37", "38", "39", "3a", "3b", "3c", "3d", "3e", "3f",
+	"40", "41", "42", "43", "44", "45", "46", "47", "48", "49", "4a", "4b", "4c", "4d", "4e", "4f",
+	"50", "51", "52", "53", "54", "55", "56", "57", "58", "59", "5a", "5b", "5c", "5d", "5e", "5f",
+	"60", "61", "62", "63", "64", "65", "66", "67", "68", "69", "6a", "6b", "6c", "6d", "6e", "6f",
+	"70", "71", "72", "73", "74", "75", "76", "77", "78", "79", "7a", "7b", "7c", "7d", "7e", "7f",
+	"80", "81", "82", "83", "84", "85", "86", "87", "88", "89", "8a", "8b", "8c", "8d", "8e", "8f",
+	"90", "91", "92", "93", "94", "95", "96", "97", "98", "99", "9a", "9b", "9c", "9d", "9e", "9f",
+	"a0", "a1", "a2", "a3", "a4", "a5", "a6", "a7", "a8", "a9", "aa", "ab", "ac", "ad", "ae", "af",
+	"b0", "b1", "b2", "b3", "b4", "b5", "b6", "b7", "b8", "b9", "ba", "bb", "bc", "bd", "be", "bf",
+	"c0", "c1", "c2", "c3", "c4", "c5", "c6", "c7", "c8", "c9", "ca", "cb", "cc", "cd", "ce", "cf",
+	"d0", "d1", "d2", "d3", "d4", "d5", "d6", "d7", "d8", "d9", "da", "db", "dc", "dd", "de", "df",
+	"e0", "e1", "e2", "e3", "e4", "e5", "e6", "e7", "e8", "e9", "ea", "eb", "ec", "ed", "ee", "ef",
+	"f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7", "f8", "f9", "fa", "fb", "fc", "fd", "fe", "ff",
+};
+
 #ifndef FIXED_ROW_SIZE
 #include <alloca.h>
 #endif
 
 #ifdef FIXED_ROW_SIZE
-constexpr int ROW_SZ = FIXED_ROW_SIZE;
+constexpr const int ROW_SZ = FIXED_ROW_SIZE;
 #endif
 
+template<typename... S>
+inline __attribute__((always_inline)) void prints(const S&... strings)
+{
+	(fputs((const char*)strings, stdout), ...);
+}
+
+inline void hex02(std::uint8_t byte, char buffer[2])
+{
+	buffer[0] =hex_map[byte][0];
+	buffer[1] =hex_map[byte][1];
+}
+
+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)
-  {
+	void print_screen(const span<unsigned char> memory, unsigned long offset)
+	{
 #ifndef FIXED_ROW_SIZE
-#define S (const char*)
-    int ROW_SZ = 24;
+#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 ascii[1 + ROW_SZ];
-    ascii[ROW_SZ] = 0;
-    std::size_t i=0;
-    for(;i<memory.size();i++) {
-      if (i && i % ROW_SZ == 0) {
-	fmt::print("  {}", S ascii);
-	fmt::print("\n0x{:016x}  ", i+offset);
-      }
-      fmt::print("{:02x} ", memory[i]);
-      ascii[i%ROW_SZ] = ascii_map[memory[i]];
-    }
-    if (memory.size() % ROW_SZ != 0)
-      {
-	auto rest = memory.size() % ROW_SZ;
-	ascii[rest] = 0;
-	for(std::size_t j=0;j< ROW_SZ - rest;j++)
-	  fmt::print("   ");
-	  
-      }
-    fmt::print("  {}", S ascii);    
-  }
+		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();
+			
+		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
+				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 (memsize % ROW_SZ != 0)
+		{
+			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((const char*) r_ascii);
+		}
+		else {
+			P_EX(S, r_ascii);
+		}
+	}
 }

src/memory-map.cpp

@@ -9,12 +9,12 @@ namespace hv
   memory_map::memory_map(std::uint64_t size, int&& fd) noexcept
     : is_cow(false), size(size), fd(fd), block0(mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0))
   {
-    if(!block0) throw "memory_map failed";
+    if(!block0) std::terminate();
   }
   memory_map::memory_map(std::uint64_t size, int&& fd, bool _cow) noexcept
     : is_cow(true), size(size), fd(fd), block0(mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0))
   {
-    if(!block0) throw "memory_map::cow failed";
+    if(!block0) std::terminate();
   }
   memory_map::memory_map(std::uint64_t size, const char* file) noexcept
     : memory_map(size, open(file, O_RDWR)) {}