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Code Issues 1 Releases Wiki Activity

Add variadic arithmetic special forms

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This commit is contained in:
Calvin Rose 2017-03-08 10:21:09 -05:00
parent 0d066d8754
commit 40b52dbe70
4 changed files with 108 additions and 55 deletions
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136
compile.c
View File

@ -470,35 +470,47 @@ static void tracker_init_tuple(GstCompiler *c, FormOptions opts,
}
}
/* Define some flags for operators */
#define OP_REVERSE 1
#define OP_FOLD 2
#define OP_DEFAULT_INT 4
#define OP_1_REPEAT 8
#define OP_1_BOOLEAN 16
#define OP_0_BOOLEAN 32
/* Compile a special form in the form of an operator. There
* are four choices for opcodes - when the operator is called
* with 0, 1, 2, or n arguments. When the operator form is
* called with n arguments, the number of arguments is written
* after the op code, followed by those arguments.
*
* This makes a few assumptions about the operators. One, no side
* effects. With this assumptions, if the result of the operator
* is unused, it's calculation can be ignored (the evaluation of
* its argument is still carried out, but their results can
* also be ignored). */
* This function also takes flags to modify the behavior of the operators
* And give them capabilities beyond binary and unary operator. */
static Slot compile_operator(GstCompiler *c, FormOptions opts, GstValue *form,
int16_t op0, int16_t op1, int16_t op2, int16_t opn, int reverseOperands) {
int16_t op0, int16_t op1, int16_t op2, int16_t opn, int flags) {
GstScope *scope = c->tail;
GstBuffer *buffer = c->buffer;
Slot ret;
SlotTracker tracker;
uint32_t count = gst_tuple_length(form);
/* Compile operands */
tracker_init_tuple(c, opts, &tracker, form, 1, 0);
/* Free up space */
compiler_tracker_free(c, scope, &tracker);
/* Check for some early exit conditions */
if (count == 2 && (flags & OP_1_REPEAT)) {
return compile_value(c, opts, form[1]);
}
if (opts.resultUnused) {
ret = nil_slot();
} else {
ret = compiler_get_target(c, opts);
/* Write the correct opcode */
if (count < 2) {
if (op0 < 0) {
if (flags & OP_DEFAULT_INT) {
gst_buffer_push_u16(c->vm, buffer, GST_OP_I16);
gst_buffer_push_u16(c->vm, buffer, ret.index);
gst_buffer_push_i16(c->vm, buffer, op0);
} else if (flags & OP_0_BOOLEAN) {
gst_buffer_push_u16(c->vm, buffer, op0 ? GST_OP_TRU : GST_OP_FLS);
gst_buffer_push_u16(c->vm, buffer, ret.index);
} else if (op0 < 0) {
if (opn < 0) c_error(c, "this operator does not take 0 arguments");
goto opn;
} else {
@ -506,72 +518,88 @@ static Slot compile_operator(GstCompiler *c, FormOptions opts, GstValue *form,
gst_buffer_push_u16(c->vm, buffer, ret.index);
}
} else if (count == 2) {
if (op1 < 0) {
if (flags & OP_1_BOOLEAN) {
gst_buffer_push_u16(c->vm, buffer, op1 ? GST_OP_TRU : GST_OP_FLS);
gst_buffer_push_u16(c->vm, buffer, ret.index);
return ret;
} else if (op1 < 0) {
if (opn < 0) c_error(c, "this operator does not take 1 argument");
goto opn;
} else {
tracker_init_tuple(c, opts, &tracker, form, 1, 0);
compiler_tracker_free(c, scope, &tracker);
gst_buffer_push_u16(c->vm, buffer, op1);
gst_buffer_push_u16(c->vm, buffer, ret.index);
compiler_tracker_write(c, &tracker, flags & OP_REVERSE);
}
} else if (count == 3) {
if (op2 < 0) {
if (opn < 0) c_error(c, "this operator does not take 2 arguments");
goto opn;
} else {
tracker_init_tuple(c, opts, &tracker, form, 1, 0);
compiler_tracker_free(c, scope, &tracker);
gst_buffer_push_u16(c->vm, buffer, op2);
gst_buffer_push_u16(c->vm, buffer, ret.index);
compiler_tracker_write(c, &tracker, flags & OP_REVERSE);
}
} else {
opn:
if (opn < 0) c_error(c, "this operator does not take n arguments");
gst_buffer_push_u16(c->vm, buffer, opn);
gst_buffer_push_u16(c->vm, buffer, ret.index);
gst_buffer_push_u16(c->vm, buffer, count - 1);
/* Use a left-fold for arithmetic operators */
if (flags & OP_FOLD) {
uint32_t i;
FormOptions subOpts = form_options_default();
Slot lhs = compile_value(c, subOpts, form[1]);
Slot rhs = compile_value(c, subOpts, form[2]);
gst_buffer_push_u16(c->vm, buffer, op2);
gst_buffer_push_u16(c->vm, buffer, ret.index);
gst_buffer_push_u16(c->vm, buffer, lhs.index);
gst_buffer_push_u16(c->vm, buffer, rhs.index);
compiler_drop_slot(c, scope, lhs);
compiler_drop_slot(c, scope, rhs);
for (i = 3; i < count; ++i) {
rhs = compile_value(c, subOpts, form[i]);
gst_buffer_push_u16(c->vm, buffer, op2);
gst_buffer_push_u16(c->vm, buffer, ret.index);
gst_buffer_push_u16(c->vm, buffer, ret.index);
gst_buffer_push_u16(c->vm, buffer, rhs.index);
compiler_drop_slot(c, scope, rhs);
}
} else {
if (opn < 0) c_error(c, "this operator does not take n arguments");
tracker_init_tuple(c, opts, &tracker, form, 1, 0);
compiler_tracker_free(c, scope, &tracker);
gst_buffer_push_u16(c->vm, buffer, opn);
gst_buffer_push_u16(c->vm, buffer, ret.index);
gst_buffer_push_u16(c->vm, buffer, count - 1);
compiler_tracker_write(c, &tracker, flags & OP_REVERSE);
}
}
}
/* Write the location of all of the arguments */
compiler_tracker_write(c, &tracker, reverseOperands);
return ret;
}
/* Math specials */
static Slot compile_addition(GstCompiler *c, FormOptions opts, GstValue *form) {
return compile_operator(c, opts, form, -1, -1, GST_OP_ADD, -1, 0);
}
static Slot compile_subtraction(GstCompiler *c, FormOptions opts, GstValue *form) {
return compile_operator(c, opts, form, -1, -1, GST_OP_SUB, -1, 0);
}
static Slot compile_multiplication(GstCompiler *c, FormOptions opts, GstValue *form) {
return compile_operator(c, opts, form, -1, -1, GST_OP_MUL, -1, 0);
}
static Slot compile_division(GstCompiler *c, FormOptions opts, GstValue *form) {
return compile_operator(c, opts, form, -1, -1, GST_OP_DIV, -1, 0);
}
static Slot compile_equals(GstCompiler *c, FormOptions opts, GstValue *form) {
return compile_operator(c, opts, form, -1, -1, GST_OP_EQL, -1, 0);
}
static Slot compile_lt(GstCompiler *c, FormOptions opts, GstValue *form) {
return compile_operator(c, opts, form, -1, -1, GST_OP_LTN, -1, 0);
}
static Slot compile_lte(GstCompiler *c, FormOptions opts, GstValue *form) {
return compile_operator(c, opts, form, -1, -1, GST_OP_LTE, -1, 0);
}
static Slot compile_gt(GstCompiler *c, FormOptions opts, GstValue *form) {
return compile_operator(c, opts, form, -1, -1, GST_OP_LTN, -1, 1);
}
static Slot compile_gte(GstCompiler *c, FormOptions opts, GstValue *form) {
return compile_operator(c, opts, form, -1, -1, GST_OP_LTE, -1, 1);
}
static Slot compile_not(GstCompiler *c, FormOptions opts, GstValue *form) {
return compile_operator(c, opts, form, -1, GST_OP_NOT, -1, -1, 0);
}
static Slot compile_get(GstCompiler *c, FormOptions opts, GstValue *form) {
return compile_operator(c, opts, form, -1, -1, GST_OP_GET, -1, 0);
}
static Slot compile_make_tuple(GstCompiler *c, FormOptions opts, GstValue *form) {
return compile_operator(c, opts, form, -1, -1, -1, GST_OP_TUP, 0);
/* Quickly define some specials */
#define MAKE_SPECIAL(name, op0, op1, op2, opn, flags) \
static Slot compile_##name (GstCompiler *c, FormOptions opts, GstValue *form) {\
return compile_operator(c, opts, form, (op0), (op1), (op2), (opn), (flags));\
}
MAKE_SPECIAL(addition, 0, -1, GST_OP_ADD, -1, OP_FOLD | OP_DEFAULT_INT | OP_1_REPEAT)
MAKE_SPECIAL(subtraction, 0, GST_OP_NEG, GST_OP_SUB, -1, OP_FOLD | OP_DEFAULT_INT)
MAKE_SPECIAL(multiplication, 1, -1, GST_OP_MUL, -1, OP_FOLD | OP_DEFAULT_INT | OP_1_REPEAT)
MAKE_SPECIAL(division, 1, GST_OP_INV, GST_OP_DIV, -1, OP_FOLD | OP_DEFAULT_INT)
MAKE_SPECIAL(equals, 1, 1, GST_OP_EQL, -1, OP_0_BOOLEAN | OP_1_BOOLEAN)
MAKE_SPECIAL(lt, 1, 1, GST_OP_LTN, -1, OP_0_BOOLEAN | OP_1_BOOLEAN)
MAKE_SPECIAL(lte, 1, 1, GST_OP_LTE, -1, OP_0_BOOLEAN | OP_1_BOOLEAN)
MAKE_SPECIAL(gt, 1, 1, GST_OP_LTN, -1, OP_0_BOOLEAN | OP_1_BOOLEAN | OP_REVERSE)
MAKE_SPECIAL(gte, 1, 1, GST_OP_LTE, -1, OP_0_BOOLEAN | OP_1_BOOLEAN | OP_REVERSE)
MAKE_SPECIAL(not, -1, GST_OP_NOT, -1, -1, 0)
MAKE_SPECIAL(get, -1, -1, GST_OP_GET, -1, 0)
MAKE_SPECIAL(make_tuple, -1, -1, -1, GST_OP_TUP, 0)
#undef MAKE_SPECIAL
/* Associative set */
static Slot compile_set(GstCompiler *c, FormOptions opts, GstValue *form) {
GstBuffer *buffer = c->buffer;

4
datatypes.h
View File

@ -216,7 +216,9 @@ enum GstOpCode {
GST_OP_IDV, /* Integer division */
GST_OP_EXP, /* Exponentiation */
GST_OP_CCT, /* Concatenation */
GST_OP_NOT, /* Invert */
GST_OP_NOT, /* Boolean invert */
GST_OP_NEG, /* Unary negation */
GST_OP_INV, /* Unary multiplicative inverse */
GST_OP_LEN, /* Length */
GST_OP_TYP, /* Type */
GST_OP_FLS, /* Load false */

5
macros.gst Normal file
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@ -0,0 +1,5 @@
# Some basic macros
(defmacro for [bindings ...]
)

18
vm.c
View File

@ -111,6 +111,24 @@ int gst_start(Gst *vm) {
pc += 3;
break;
case GST_OP_NEG: /* Unary negation */
v1 = stack[pc[2]];
gst_assert(vm, v1.type == GST_NUMBER, GST_EXPECTED_NUMBER_LOP);
temp.type = GST_NUMBER;
temp.data.number = -v1.data.number;
stack[pc[1]] = temp;
pc += 3;
break;
case GST_OP_INV: /* Unary multiplicative inverse */
v1 = stack[pc[2]];
gst_assert(vm, v1.type == GST_NUMBER, GST_EXPECTED_NUMBER_LOP);
temp.type = GST_NUMBER;
temp.data.number = 1 / v1.data.number;
stack[pc[1]] = temp;
pc += 3;
break;
case GST_OP_FLS: /* Load False */
temp.type = GST_BOOLEAN;
temp.data.boolean = 0;