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Code Issues 1 Releases Wiki Activity

Merge updates.

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This commit is contained in:
Calvin Rose
2018-07-01 15:56:08 -04:00
parent 0bbf7d57b0 6822400abe
commit f1e1b89c67
12 changed files with 119 additions and 160 deletions
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14
src/compiler/boot.dst
View File

@@ -266,7 +266,7 @@ value."
subloop
(tuple ':= bindings (tuple + bindings inc)))))
:keys (do
(def $dict (gensym "dict"))
(def $dict (gensym))
(def preds @['and (tuple not= nil bindings)])
(def subloop (doone (+ i 3) preds))
(tuple 'do
@@ -276,9 +276,9 @@ value."
subloop
(tuple ':= bindings (tuple next $dict bindings)))))
:in (do
(def $len (gensym "len"))
(def $i (gensym "i"))
(def $indexed (gensym "indexed"))
(def $len (gensym))
(def $i (gensym))
(def $indexed (gensym))
(def preds @['and (tuple < $i $len)])
(def subloop (doone (+ i 3) preds))
(tuple 'do
@@ -295,7 +295,7 @@ value."
(defmacro for
"Similar to loop, but accumulates the loop body into an array and returns that."
[head & body]
(def $accum (gensym "accum"))
(def $accum (gensym))
(tuple 'do
(tuple 'def $accum @[])
(tuple 'loop head
@@ -1059,8 +1059,8 @@ onvalue."
(do
(file.write stdout " [" source "]")
(if source-line (file.write stdout " on line "
(string source-line) ", column " (string source-col))))
(if pc (file.write stdout " at (pc=" (string pc) ")")))
(string source-line) ", column " (string source-col)))))
(if pc (file.write stdout " (pc=" (string pc) ")"))
(when tail (file.write stdout " (tailcall)"))
(file.write stdout "\n"))))

8
src/compiler/compile.c
View File

@@ -101,7 +101,7 @@ DstSlot dstc_cslot(Dst x) {
DstSlot dstc_nearslot(DstCompiler *c, DstcRegisterTemp tag) {
DstSlot ret;
ret.flags = DST_SLOTTYPE_ANY;
ret.index = dstc_getreg_temp(c, tag);
ret.index = dstc_allocnear(c, tag);
ret.constant = dst_wrap_nil();
ret.envindex = -1;
return ret;
@@ -111,7 +111,7 @@ DstSlot dstc_nearslot(DstCompiler *c, DstcRegisterTemp tag) {
DstSlot dstc_farslot(DstCompiler *c) {
DstSlot ret;
ret.flags = DST_SLOTTYPE_ANY;
ret.index = dstc_getreg(c);
ret.index = dstc_allocfar(c);
ret.constant = dst_wrap_nil();
ret.envindex = -1;
return ret;
@@ -314,7 +314,7 @@ DstSlot dstc_gettarget(DstFopts opts) {
slot.envindex = -1;
slot.constant = dst_wrap_nil();
slot.flags = 0;
slot.index = dstc_getreg_temp(opts.compiler, DSTC_REGTEMP_3);
slot.index = dstc_allocnear(opts.compiler, DSTC_REGTEMP_3);
}
return slot;
}
@@ -403,7 +403,7 @@ static DstSlot dstc_call(DstFopts opts, DstSlot *slots, DstSlot fun) {
retslot.flags = DST_SLOT_RETURNED;
} else {
retslot = dstc_gettarget(opts);
int32_t fun_register = dstc_to_tempreg(c, fun, DSTC_REGTEMP_0);
int32_t fun_register = dstc_regnear(c, fun, DSTC_REGTEMP_0);
dstc_emit(c, DOP_CALL |
(retslot.index << 8) |
(fun_register << 16));

55
src/compiler/emit.c
View File

@@ -25,7 +25,7 @@
#include "emit.h"
/* Get a register */
int32_t dstc_getreg(DstCompiler *c) {
int32_t dstc_allocfar(DstCompiler *c) {
int32_t reg = dstc_regalloc_1(&c->scope->ra);
if (reg > 0xFFFF) {
dstc_cerror(c, "ran out of internal registers");
@@ -34,7 +34,7 @@ int32_t dstc_getreg(DstCompiler *c) {
}
/* Get a register less than 256 */
int32_t dstc_getreg_temp(DstCompiler *c, DstcRegisterTemp tag) {
int32_t dstc_allocnear(DstCompiler *c, DstcRegisterTemp tag) {
return dstc_regalloc_temp(&c->scope->ra, tag);
}
@@ -107,10 +107,10 @@ static void dstc_loadconst(DstCompiler *c, Dst k, int32_t reg) {
}
/* Convert a slot to a two byte register */
int32_t dstc_to_reg(DstCompiler *c, DstSlot s) {
int32_t dstc_regfar(DstCompiler *c, DstSlot s, DstcRegisterTemp tag) {
int32_t reg;
if (s.flags & (DST_SLOT_CONSTANT | DST_SLOT_REF)) {
reg = dstc_getreg(c);
reg = dstc_allocnear(c, tag);
dstc_loadconst(c, s.constant, reg);
/* If we also are a reference, deref the one element array */
if (s.flags & DST_SLOT_REF) {
@@ -119,8 +119,8 @@ int32_t dstc_to_reg(DstCompiler *c, DstSlot s) {
(reg << 8) |
DOP_GET_INDEX);
}
} else if (s.envindex >= 0 || s.index > 0xFF) {
reg = dstc_getreg(c);
} else if (s.envindex >= 0) {
reg = dstc_allocnear(c, tag);
dstc_emit(c,
((uint32_t)(s.index) << 24) |
((uint32_t)(s.envindex) << 16) |
@@ -134,10 +134,10 @@ int32_t dstc_to_reg(DstCompiler *c, DstSlot s) {
}
/* Convert a slot to a temporary 1 byte register */
int32_t dstc_to_tempreg(DstCompiler *c, DstSlot s, DstcRegisterTemp tag) {
int32_t dstc_regnear(DstCompiler *c, DstSlot s, DstcRegisterTemp tag) {
int32_t reg;
if (s.flags & (DST_SLOT_CONSTANT | DST_SLOT_REF)) {
reg = dstc_getreg_temp(c, tag);
reg = dstc_allocnear(c, tag);
dstc_loadconst(c, s.constant, reg);
/* If we also are a reference, deref the one element array */
if (s.flags & DST_SLOT_REF) {
@@ -146,15 +146,15 @@ int32_t dstc_to_tempreg(DstCompiler *c, DstSlot s, DstcRegisterTemp tag) {
(reg << 8) |
DOP_GET_INDEX);
}
} else if (s.envindex >= 0 || s.index > 0xFF) {
reg = dstc_getreg_temp(c, tag);
} else if (s.envindex >= 0) {
reg = dstc_allocnear(c, tag);
dstc_emit(c,
((uint32_t)(s.index) << 24) |
((uint32_t)(s.envindex) << 16) |
((uint32_t)(reg) << 8) |
DOP_LOAD_UPVALUE);
} else if (s.index > 0xFF) {
reg = dstc_getreg_temp(c, tag);
reg = dstc_allocnear(c, tag);
dstc_emit(c,
((uint32_t)(s.index) << 16) |
((uint32_t)(reg) << 8) |
@@ -175,7 +175,7 @@ void dstc_free_reg(DstCompiler *c, DstSlot s, int32_t reg) {
}
/* Check if two slots are equal */
int dstc_sequal(DstSlot lhs, DstSlot rhs) {
static int dstc_sequal(DstSlot lhs, DstSlot rhs) {
if (lhs.flags == rhs.flags &&
lhs.index == rhs.index &&
lhs.envindex == rhs.envindex) {
@@ -190,7 +190,7 @@ int dstc_sequal(DstSlot lhs, DstSlot rhs) {
/* Move values from one slot to another. The destination must
* be writeable (not a literal). */
int dstc_copy(
void dstc_copy(
DstCompiler *c,
DstSlot dest,
DstSlot src) {
@@ -202,11 +202,11 @@ int dstc_copy(
/* Can't write to constants */
if (dest.flags & DST_SLOT_CONSTANT) {
dstc_cerror(c, "cannot write to constant");
return 0;
return;
}
/* Short circuit if dest and source are equal */
if (dstc_sequal(dest, src)) return 0;
if (dstc_sequal(dest, src)) return;
/* Types of slots - src */
/* constants */
@@ -243,19 +243,19 @@ int dstc_copy(
(dest.index << 8) |
DOP_MOVE_NEAR);
}
return 1;
return;
}
/* Process: src -> srclocal -> destlocal -> dest */
/* src -> srclocal */
srclocal = dstc_to_tempreg(c, src, DSTC_REGTEMP_0);
srclocal = dstc_regnear(c, src, DSTC_REGTEMP_0);
/* Pull down dest (find destlocal) */
if (dest.flags & DST_SLOT_REF) {
writeback = 1;
destlocal = srclocal;
reflocal = dstc_getreg_temp(c, DSTC_REGTEMP_1);
reflocal = dstc_allocnear(c, DSTC_REGTEMP_1);
dstc_emit(c,
(dstc_const(c, dest.constant) << 16) |
(reflocal << 8) |
@@ -302,13 +302,12 @@ int dstc_copy(
dstc_regalloc_free(&c->scope->ra, reflocal);
}
dstc_free_reg(c, src, srclocal);
return 1;
}
/* Instruction templated emitters */
static int32_t emit1s(DstCompiler *c, uint8_t op, DstSlot s, int32_t rest) {
int32_t reg = dstc_to_tempreg(c, s, DSTC_REGTEMP_0);
int32_t reg = dstc_regnear(c, s, DSTC_REGTEMP_0);
int32_t label = dst_v_count(c->buffer);
dstc_emit(c, op | (reg << 8) | (rest << 16));
dstc_free_reg(c, s, reg);
@@ -316,7 +315,7 @@ static int32_t emit1s(DstCompiler *c, uint8_t op, DstSlot s, int32_t rest) {
}
int32_t dstc_emit_s(DstCompiler *c, uint8_t op, DstSlot s) {
int32_t reg = dstc_to_reg(c, s);
int32_t reg = dstc_regfar(c, s, DSTC_REGTEMP_0);
int32_t label = dst_v_count(c->buffer);
dstc_emit(c, op | (reg << 8));
dstc_free_reg(c, s, reg);
@@ -345,8 +344,8 @@ int32_t dstc_emit_su(DstCompiler *c, uint8_t op, DstSlot s, uint16_t immediate)
}
static int32_t emit2s(DstCompiler *c, uint8_t op, DstSlot s1, DstSlot s2, int32_t rest) {
int32_t reg1 = dstc_to_tempreg(c, s1, DSTC_REGTEMP_0);
int32_t reg2 = dstc_to_tempreg(c, s2, DSTC_REGTEMP_1);
int32_t reg1 = dstc_regnear(c, s1, DSTC_REGTEMP_0);
int32_t reg2 = dstc_regnear(c, s2, DSTC_REGTEMP_1);
int32_t label = dst_v_count(c->buffer);
dstc_emit(c, op | (reg1 << 8) | (reg2 << 16) | (rest << 24));
dstc_free_reg(c, s1, reg1);
@@ -355,8 +354,8 @@ static int32_t emit2s(DstCompiler *c, uint8_t op, DstSlot s1, DstSlot s2, int32_
}
int32_t dstc_emit_ss(DstCompiler *c, uint8_t op, DstSlot s1, DstSlot s2) {
int32_t reg1 = dstc_to_tempreg(c, s1, DSTC_REGTEMP_0);
int32_t reg2 = dstc_to_reg(c, s2);
int32_t reg1 = dstc_regnear(c, s1, DSTC_REGTEMP_0);
int32_t reg2 = dstc_regfar(c, s2, DSTC_REGTEMP_1);
int32_t label = dst_v_count(c->buffer);
dstc_emit(c, op | (reg1 << 8) | (reg2 << 16));
dstc_free_reg(c, s1, reg1);
@@ -373,9 +372,9 @@ int32_t dstc_emit_ssu(DstCompiler *c, uint8_t op, DstSlot s1, DstSlot s2, uint8_
}
int32_t dstc_emit_sss(DstCompiler *c, uint8_t op, DstSlot s1, DstSlot s2, DstSlot s3) {
int32_t reg1 = dstc_to_tempreg(c, s1, DSTC_REGTEMP_0);
int32_t reg2 = dstc_to_tempreg(c, s2, DSTC_REGTEMP_1);
int32_t reg3 = dstc_to_tempreg(c, s3, DSTC_REGTEMP_2);
int32_t reg1 = dstc_regnear(c, s1, DSTC_REGTEMP_0);
int32_t reg2 = dstc_regnear(c, s2, DSTC_REGTEMP_1);
int32_t reg3 = dstc_regnear(c, s3, DSTC_REGTEMP_2);
int32_t label = dst_v_count(c->buffer);
dstc_emit(c, op | (reg1 << 8) | (reg2 << 16) | (reg3 << 24));
dstc_free_reg(c, s1, reg1);

10
src/compiler/emit.h
View File

@@ -27,11 +27,11 @@
void dstc_emit(DstCompiler *c, uint32_t instr);
int32_t dstc_getreg(DstCompiler *c);
int32_t dstc_getreg_temp(DstCompiler *c, DstcRegisterTemp);
int32_t dstc_allocfar(DstCompiler *c);
int32_t dstc_allocnear(DstCompiler *c, DstcRegisterTemp);
int32_t dstc_to_reg(DstCompiler *c, DstSlot s);
int32_t dstc_to_tempreg(DstCompiler *c, DstSlot s, DstcRegisterTemp tag);
int32_t dstc_regfar(DstCompiler *c, DstSlot s, DstcRegisterTemp tag);
int32_t dstc_regnear(DstCompiler *c, DstSlot s, DstcRegisterTemp tag);
void dstc_free_reg(DstCompiler *c, DstSlot s, int32_t reg);
int32_t dstc_emit_s(DstCompiler *c, uint8_t op, DstSlot s);
@@ -45,6 +45,6 @@ int32_t dstc_emit_ssu(DstCompiler *c, uint8_t op, DstSlot s1, DstSlot s2, uint8_
int32_t dstc_emit_sss(DstCompiler *c, uint8_t op, DstSlot s1, DstSlot s2, DstSlot s3);
/* Move value from one slot to another. Cannot copy to constant slots. */
int dstc_copy(DstCompiler *c, DstSlot dest, DstSlot src);
void dstc_copy(DstCompiler *c, DstSlot dest, DstSlot src);
#endif

27
src/compiler/regalloc.c
View File

@@ -29,6 +29,7 @@ void dstc_regalloc_init(DstcRegisterAllocator *ra) {
ra->count = 0;
ra->capacity = 0;
ra->max = 0;
ra->regtemps = 0;
}
void dstc_regalloc_deinit(DstcRegisterAllocator *ra) {
@@ -126,9 +127,16 @@ int32_t dstc_regalloc_1(DstcRegisterAllocator *ra) {
* without being freed. */
void dstc_regalloc_free(DstcRegisterAllocator *ra, int32_t reg) {
/* We cannot free reserved slots */
if (reg < 0 || (reg >= 240 && reg <= 255))
if (reg < 0)
return;
if (reg >= 0xF0 && reg <= 0xFF) {
ra->regtemps &= ~(1 << (reg - 0xF0));
return;
}
int32_t chunk = reg >> 5;
/* Outside normal chunk range */
if (chunk >= ra->count)
return;
int32_t bit = reg & 0x1F;
ra->chunks[chunk] &= ~ithbit(bit);
}
@@ -139,6 +147,8 @@ void dstc_regalloc_free(DstcRegisterAllocator *ra, int32_t reg) {
int32_t dstc_regalloc_temp(DstcRegisterAllocator *ra, DstcRegisterTemp nth) {
int32_t oldmax = ra->max;
int32_t reg = dstc_regalloc_1(ra);
dst_assert(~(ra->regtemps & (1 << nth)), "regtemp already allocated");
ra->regtemps |= 1 << nth;
if (reg > 0xFF) {
reg = 0xF0 + nth;
ra->max = (reg > oldmax) ? reg : oldmax;
@@ -146,8 +156,9 @@ int32_t dstc_regalloc_temp(DstcRegisterAllocator *ra, DstcRegisterTemp nth) {
return reg;
}
/* Check if a range is free. Returns the next index to check if not free,
* -1 if free. */
/* Disable multi-slot allocation for now. */
/*
static int32_t checkrange(DstcRegisterAllocator *ra, int32_t start, int32_t end) {
int32_t startchunk = start / 32;
int32_t endchunk = end / 32;
@@ -161,7 +172,6 @@ static int32_t checkrange(DstcRegisterAllocator *ra, int32_t start, int32_t end)
uint32_t block = ra->chunks[chunk];
uint32_t masking = mask & block;
if (masking) {
/* If block is full, skip it completely. */
int32_t nextbit = (block == 0xFFFFFFFF)
? 32
: count_trailing_zeros(masking) + 1;
@@ -171,7 +181,6 @@ static int32_t checkrange(DstcRegisterAllocator *ra, int32_t start, int32_t end)
return -1;
}
/* Mark a range */
static void markrange(DstcRegisterAllocator *ra, int32_t start, int32_t end) {
int32_t startchunk = start / 32;
int32_t endchunk = end / 32;
@@ -185,7 +194,6 @@ static void markrange(DstcRegisterAllocator *ra, int32_t start, int32_t end) {
}
}
/* Free a range of registers. */
void dstc_regalloc_freerange(DstcRegisterAllocator *ra, int32_t start, int32_t n) {
int32_t end = start + n - 1;
int32_t startchunk = start / 32;
@@ -200,8 +208,6 @@ void dstc_regalloc_freerange(DstcRegisterAllocator *ra, int32_t start, int32_t n
}
}
/* Allocate n contiguous registers. Returns the first register
* in the range allocated. */
int32_t dstc_regalloc_n(DstcRegisterAllocator *ra, int32_t n) {
int32_t start = 0, end = 0, next = 0;
while (next >= 0) {
@@ -210,15 +216,11 @@ int32_t dstc_regalloc_n(DstcRegisterAllocator *ra, int32_t n) {
next = checkrange(ra, start, end);
}
markrange(ra, start, end);
/* Set max */
if (end > ra->max)
ra->max = end;
return start;
}
/* Allocates registers for a function call. Tries to not move the callee,
* but will find nargs + 1 other contiguous registers if there is not enough
* space after the callee. */
int32_t dstc_regalloc_call(DstcRegisterAllocator *ra, int32_t callee, int32_t nargs) {
if (checkrange(ra, callee, callee + nargs) < 0) {
markrange(ra, callee + 1, callee + nargs);
@@ -227,3 +229,4 @@ int32_t dstc_regalloc_call(DstcRegisterAllocator *ra, int32_t callee, int32_t na
return dstc_regalloc_n(ra, nargs + 1);
}
*/

50
src/compiler/regalloc.h
View File

@@ -44,6 +44,7 @@ typedef struct {
int32_t count; /* number of chunks in chunks */
int32_t capacity; /* amount allocated for chunks */
int32_t max; /* The maximum allocated register so far */
int32_t regtemps; /* Hold which tempregistered are alloced. */
} DstcRegisterAllocator;
void dstc_regalloc_init(DstcRegisterAllocator *ra);
@@ -51,56 +52,15 @@ void dstc_regalloc_deinit(DstcRegisterAllocator *ra);
int32_t dstc_regalloc_1(DstcRegisterAllocator *ra);
void dstc_regalloc_free(DstcRegisterAllocator *ra, int32_t reg);
void dstc_regalloc_freerange(DstcRegisterAllocator *ra, int32_t regstart, int32_t n);
int32_t dstc_regalloc_temp(DstcRegisterAllocator *ra, DstcRegisterTemp nth);
int32_t dstc_regalloc_n(DstcRegisterAllocator *ra, int32_t n);
int32_t dstc_regalloc_call(DstcRegisterAllocator *ra, int32_t callee, int32_t nargs);
void dstc_regalloc_clone(DstcRegisterAllocator *dest, DstcRegisterAllocator *src);
void dstc_regalloc_touch(DstcRegisterAllocator *ra, int32_t reg);
/* Test code */
/* Mutli-slot allocation disabled */
/*
#include <stdio.h>
static void printreg(DstcRegisterAllocator *ra) {
printf("count=%d, cap=%d, max=%d\n", ra->count, ra->capacity, ra->max);
for (int row = 0; row < ra->count; row++) {
uint32_t chunk = ra->chunks[row];
putc('[', stdout);
for (int i = 0; i < 32; i++) {
putc(
(chunk & (1 << i))
? '*'
: '.', stdout);
}
putc(']', stdout);
putc('\n', stdout);
}
putc('\n', stdout);
}
static void runtest(void) {
DstcRegisterAllocator ra, rb;
dstc_regalloc_init(&ra);
int32_t a = dstc_regalloc_1(&ra);
int32_t b = dstc_regalloc_1(&ra);
int32_t c = dstc_regalloc_1(&ra);
int32_t d = dstc_regalloc_1(&ra);
int32_t e = dstc_regalloc_1(&ra);
printreg(&ra);
dstc_regalloc_free(&ra, b);
dstc_regalloc_free(&ra, d);
printreg(&ra);
int32_t x = dstc_regalloc_n(&ra, 32);
printreg(&ra);
dstc_regalloc_1(&ra);
printreg(&ra);
int32_t y = dstc_regalloc_n(&ra, 101);
printreg(&ra);
dstc_regalloc_clone(&rb, &ra);
printreg(&rb);
dstc_regalloc_deinit(&ra);
dstc_regalloc_deinit(&rb);
}
int32_t dstc_regalloc_n(DstcRegisterAllocator *ra, int32_t n);
int32_t dstc_regalloc_call(DstcRegisterAllocator *ra, int32_t callee, int32_t nargs);
void dstc_regalloc_freerange(DstcRegisterAllocator *ra, int32_t regstart, int32_t n);
*/
#endif

19
src/compiler/specials.c
View File

@@ -63,8 +63,8 @@ static void destructure(DstCompiler *c,
for (i = 0; i < len; i++) {
DstSlot nextright;
Dst subval = values[i];
right_register = dstc_to_tempreg(c, right, DSTC_REGTEMP_0);
subval_register = dstc_getreg_temp(c, DSTC_REGTEMP_1);
right_register = dstc_regnear(c, right, DSTC_REGTEMP_0);
subval_register = dstc_allocnear(c, DSTC_REGTEMP_1);
if (i < 0x100) {
dstc_emit(c, DOP_GET_INDEX |
(subval_register << 8) |
@@ -72,7 +72,7 @@ static void destructure(DstCompiler *c,
(i << 24));
} else {
DstSlot islot = dstc_cslot(dst_wrap_integer(i));
int32_t i_register = dstc_to_tempreg(c, islot, DSTC_REGTEMP_2);
int32_t i_register = dstc_regnear(c, islot, DSTC_REGTEMP_2);
dstc_emit(c, DOP_GET_INDEX |
(subval_register << 8) |
(right_register << 16) |
@@ -88,8 +88,6 @@ static void destructure(DstCompiler *c,
dstc_free_reg(c, right, right_register);
}
}
/* Free right */
dstc_freeslot(c, right);
break;
case DST_TABLE:
case DST_STRUCT:
@@ -100,9 +98,9 @@ static void destructure(DstCompiler *c,
DstSlot nextright;
DstSlot kslot = dstc_value(dstc_fopts_default(c), kv->key);
right_register = dstc_to_tempreg(c, right, DSTC_REGTEMP_0);
subval_register = dstc_getreg_temp(c, DSTC_REGTEMP_1);
k_register = dstc_to_tempreg(c, kslot, DSTC_REGTEMP_2);
right_register = dstc_regnear(c, right, DSTC_REGTEMP_0);
subval_register = dstc_allocnear(c, DSTC_REGTEMP_1);
k_register = dstc_regnear(c, kslot, DSTC_REGTEMP_2);
dstc_emit(c, DOP_GET |
(subval_register << 8) |
(right_register << 16) |
@@ -117,11 +115,8 @@ static void destructure(DstCompiler *c,
dstc_free_reg(c, right, right_register);
}
}
/* Free right */
dstc_freeslot(c, right);
break;
}
}
DstSlot dstc_varset(DstFopts opts, int32_t argn, const Dst *argv) {
@@ -193,7 +188,7 @@ static DstSlot namelocal(DstCompiler *c, Dst head, int32_t flags, DstSlot ret) {
ret.index > 0xFF) {
/* Slot is not able to be named */
DstSlot localslot;
localslot.index = dstc_getreg(c);
localslot.index = dstc_allocfar(c);
/* infer type? */
localslot.flags = flags;
localslot.envindex = -1;

11
src/core/corelib.c
View File

@@ -169,15 +169,8 @@ int dst_core_struct(DstArgs args) {
}
int dst_core_gensym(DstArgs args) {
DST_MAXARITY(args, 1);
if (args.n == 0) {
DST_RETURN_SYMBOL(args, dst_symbol_gen(NULL, 0));
} else {
const uint8_t *s;
int32_t len;
DST_ARG_BYTES(s, len, args, 0);
DST_RETURN_SYMBOL(args, dst_symbol_gen(s, len));
}
DST_FIXARITY(args, 0);
DST_RETURN_SYMBOL(args, dst_symbol_gen());
}
int dst_core_gccollect(DstArgs args) {

74
src/core/symcache.c
View File

@@ -201,48 +201,52 @@ const uint8_t *dst_symbol_from_string(const uint8_t *str) {
return str;
}
/* Helper for creating a unique string. Increment an integer
* represented as an array of integer digits. */
static void inc_counter(uint8_t *digits, int base, int len) {
int i;
uint8_t carry = 1;
for (i = len - 1; i >= 0; --i) {
digits[i] += carry;
carry = 0;
if (digits[i] == base) {
digits[i] = 0;
carry = 1;
/* Store counter for genysm to avoid quadratic behavior */
DST_THREAD_LOCAL uint8_t gensym_counter[8] = {'_', '0', '0', '0', '0', '0', '0', 0};
/* Increment the gensym buffer */
static void inc_gensym(void) {
for (int i = sizeof(gensym_counter) - 2; i; i--) {
if (gensym_counter[i] == '9') {
gensym_counter[i] = 'a';
} else if (gensym_counter[i] == 'z') {
gensym_counter[i] = 'A';
} else if (gensym_counter[i] == 'Z') {
gensym_counter[i] = '0';
} else {
gensym_counter[i]++;
break;
}
}
}
/* Generate a unique symbol. This is used in the library function gensym. The
* symbol will be of the format prefix_XXXXXX, where X is a base64 digit, and
* prefix is the argument passed. */
const uint8_t *dst_symbol_gen(const uint8_t *buf, int32_t len) {
* symbol will be of the format _XXXXXX, where X is a base64 digit, and
* prefix is the argument passed. No prefix for speed. */
const uint8_t *dst_symbol_gen(void) {
const uint8_t **bucket = NULL;
uint8_t *sym;
int32_t hash = 0;
uint8_t counter[6] = {63, 63, 63, 63, 63, 63};
int status;
/* Leave spaces for 6 base 64 digits and two dashes. That means 64^6 possible suffixes, which
* is enough for resolving collisions. */
int32_t newlen = len + 7;
int32_t newbufsize = newlen + 2 * sizeof(int32_t) + 1;
uint8_t *str = (uint8_t *)dst_gcalloc(DST_MEMORY_SYMBOL, newbufsize) + 2 * sizeof(int32_t);
dst_string_length(str) = newlen;
memcpy(str, buf, len);
str[len] = '_';
str[newlen] = 0;
uint8_t *saltbuf = str + len + 1;
int status = 1;
while (status) {
int i;
inc_counter(counter, 64, 6);
for (i = 0; i < 6; ++i)
saltbuf[i] = dst_base64[counter[i]];
hash = dst_string_calchash(str, newlen);
bucket = dst_symcache_findmem(str, newlen, hash, &status);
}
dst_string_hash(str) = hash;
dst_symcache_put((const uint8_t *)str, bucket);
return (const uint8_t *)str;
do {
hash = dst_string_calchash(
gensym_counter,
sizeof(gensym_counter) - 1);
bucket = dst_symcache_findmem(
gensym_counter,
sizeof(gensym_counter) - 1,
hash,
&status);
} while (status && (inc_gensym(), 1));
sym = (uint8_t *) dst_gcalloc(
DST_MEMORY_SYMBOL,
2 * sizeof(int32_t) + sizeof(gensym_counter)) +
(2 * sizeof(int32_t));
memcpy(sym, gensym_counter, sizeof(gensym_counter));
dst_string_length(sym) = sizeof(gensym_counter) - 1;
dst_string_hash(sym) = hash;
dst_symcache_put((const uint8_t *)sym, bucket);
return (const uint8_t *)sym;
}

2
src/include/dst/dst.h
View File

@@ -129,7 +129,7 @@ void dst_puts(const uint8_t *str);
const uint8_t *dst_symbol(const uint8_t *str, int32_t len);
const uint8_t *dst_symbol_from_string(const uint8_t *str);
const uint8_t *dst_csymbol(const char *str);
const uint8_t *dst_symbol_gen(const uint8_t *buf, int32_t len);
const uint8_t *dst_symbol_gen();
#define dst_symbolv(str, len) dst_wrap_symbol(dst_symbol((str), (len)))
#define dst_csymbolv(cstr) dst_wrap_symbol(dst_csymbol(cstr))