hyperledger-solang_solang/stdlib/stdlib.c

// clang --target=wasm32 -c -emit-llvm -O3 -ffreestanding -fno-builtin -Wall stdlib.c
#include <stdint.h>
#include <stddef.h>
#include <stdbool.h>

#include "stdlib.h"

/*
 */
void __memset8(void *_dest, uint64_t val, uint32_t length)
{
	uint64_t *dest = _dest;

	do
	{
		*dest++ = val;
	} while (--length);
}

void __memset(void *_dest, uint8_t val, size_t length)
{
	uint8_t *dest = _dest;

	do
	{
		*dest++ = val;
	} while (--length);
}

/*
 * Our memcpy can only deal with multiples of 8 bytes. This is enough for
 * simple allocator below.
 */
void __memcpy8(void *_dest, void *_src, uint32_t length)
{
	uint64_t *dest = _dest;
	uint64_t *src = _src;

	do
	{
		*dest++ = *src++;
	} while (--length);
}

void __memcpy(void *_dest, const void *_src, uint32_t length)
{
	uint8_t *dest = _dest;
	const uint8_t *src = _src;

	while (length--)
	{
		*dest++ = *src++;
	}
}

/*
 * Fast-ish clear, 8 bytes at a time.
 */
void __bzero8(void *_dest, uint32_t length)
{
	uint64_t *dest = _dest;

	while (length--)
	{
		*dest++ = 0;
	}
}

int __memcmp_ord(uint8_t *a, uint8_t *b, uint32_t len)
{
	do
	{
		int diff = (int)(*a++) - (int)(*b++);

		if (diff)
			return diff;
	} while (--len);

	return 0;
}

// This function is used for abi decoding integers.
// ABI encoding is big endian, and can have integers of 8 to 256 bits
// (1 to 32 bytes). This function copies length bytes and reverses the
// order since wasm is little endian.
void __be32toleN(uint8_t *from, uint8_t *to, uint32_t length)
{
	from += 31;

	do
	{
		*to++ = *from--;
	} while (--length);
}

void __beNtoleN(uint8_t *from, uint8_t *to, uint32_t length)
{
	from += length;

	do
	{
		*to++ = *--from;
	} while (--length);
}

// This function is for used for abi encoding integers
// ABI encoding is big endian.
void __leNtobe32(uint8_t *from, uint8_t *to, uint32_t length)
{
	to += 31;

	do
	{
		*to-- = *from++;
	} while (--length);
}

void __leNtobeN(uint8_t *from, uint8_t *to, uint32_t length)
{
	to += length;

	do
	{
		*--to = *from++;
	} while (--length);
}

// Create a new vector. If initial is -1 then clear the data. This is done since a null pointer valid in wasm
struct vector *vector_new(uint32_t members, uint32_t size, uint8_t *initial)
{
	struct vector *v;
	size_t size_array = members * size;

	v = __malloc(sizeof(*v) + size_array);
	v->len = members;
	v->size = members;

	uint8_t *data = v->data;

	if ((int)initial != -1)
	{
		while (size_array--)
		{
			*data++ = *initial++;
		}
	}
	else
	{
		while (size_array--)
		{
			*data++ = 0;
		}
	}

	return v;
}

uint64_t vector_hash(struct vector *v)
{
	uint64_t hash = 0;
	uint8_t *data = v->data;
	uint32_t len = v->len;

	while (len--)
	{
		hash += *data;
	}

	return hash;
}

bool __memcmp(uint8_t *left, uint32_t left_len, uint8_t *right, uint32_t right_len)
{
	if (left_len != right_len)
		return false;

	while (left_len--)
	{
		if (*left++ != *right++)
			return false;
	}

	return true;
}

struct vector *concat(uint8_t *left, uint32_t left_len, uint8_t *right, uint32_t right_len)
{
	size_t size_array = left_len + right_len;
	struct vector *v = __malloc(sizeof(*v) + size_array);
	v->len = size_array;
	v->size = size_array;

	uint8_t *data = v->data;

	while (left_len--)
	{
		*data++ = *left++;
	}

	while (right_len--)
	{
		*data++ = *right++;
	}

	return v;
}