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added some code to compile the break statement

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This commit is contained in:
hyunghwan.chung 2017-01-29 07:14:36 +00:00
parent 10ca940d72
commit 03ddf6b68d
6 changed files with 152 additions and 113 deletions
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4
moo/kernel/Mill.moo
View File

@ -180,8 +180,8 @@ class MyObject(Object)
while (true)
{
a := a + 1.
if (a < 9) { continue }.
a dump;
if (a > 20) { break }.
a dump.
}.
'---------- END ------------' dump.
##Processor sleepFor: 20.

2
moo/kernel/generr.moo
View File

@ -98,6 +98,8 @@ class MyObject(Object)
'wrong pool dictionary name'
'duplicate pool dictionary name'
'literal expected'
'break or continue not within a loop'
'break or continue within a block'
).
f := Stdio open: 'generr.out' for: 'w'.

229
moo/lib/comp.c
View File

@ -562,6 +562,59 @@ static moo_oop_t string_to_error (moo_t* moo, moo_oocs_t* str)
return MOO_ERROR_TO_OOP(num);
}
/* ---------------------------------------------------------------------
* SOME PRIVIATE UTILITILES
* --------------------------------------------------------------------- */
static void init_oow_pool (moo_t* moo, moo_oow_pool_t* pool)
{
pool->count = 0;
pool->static_chunk.next = MOO_NULL;
pool->head = &pool->static_chunk;
pool->tail = &pool->static_chunk;
}
static void fini_oow_pool (moo_t* moo, moo_oow_pool_t* pool)
{
moo_oow_pool_chunk_t* chunk, * next;
/* dispose all chunks except the first static one */
chunk = pool->head->next;
while (chunk)
{
next = chunk->next;
moo_freemem (moo, chunk);
chunk = next;
}
/* this doesn't reinitialize the pool. call init_oow_pool()
* to reuse it */
}
static int add_to_oow_pool (moo_t* moo, moo_oow_pool_t* pool, moo_oow_t v)
{
moo_oow_t idx;
idx = pool->count % MOO_COUNTOF(pool->static_chunk.buf);
if (pool->count > 0 && idx == 0)
{
moo_oow_pool_chunk_t* chunk;
chunk = moo_allocmem (moo, MOO_SIZEOF(pool->static_chunk));
if (!chunk) return -1;
chunk->next = MOO_NULL;
pool->tail->next = chunk;
pool->tail = chunk;
}
pool->tail->buf[idx] = v;
pool->count++;
return 0;
}
/* ---------------------------------------------------------------------
* Tokenizer
* --------------------------------------------------------------------- */
@ -3341,6 +3394,7 @@ static int push_loop (moo_t* moo, moo_oow_t startpos)
loop = moo_callocmem (moo, MOO_SIZEOF(*loop));
if (!loop) return -1;
init_oow_pool (moo, &loop->break_ip_pool);
loop->startpos = startpos;
loop->next = moo->c->mth.loop;
moo->c->mth.loop = loop;
@ -3348,17 +3402,44 @@ static int push_loop (moo_t* moo, moo_oow_t startpos)
return 0;
}
static void pop_loop (moo_t* moo, moo_oow_t endpos)
static int pop_loop (moo_t* moo, int patch_break)
{
moo_loop_t* loop;
/* this function must be called when moo->c->mth.code.len is pointing
* to the intended target position because patch_long_forward_jump_instruction()
* patches jumps using the current value in moo->c->mth.code.len */
MOO_ASSERT (moo, moo->c->mth.loop != MOO_NULL);
loop = moo->c->mth.loop;
MOO_ASSERT (moo, loop != MOO_NULL);
moo->c->mth.loop = loop->next;
if (patch_break)
{
/* patch the jump instructions emitted for 'break' */
moo_oow_pool_chunk_t* chunk;
moo_oow_t i, j;
/* TODO: update all break instructions... */
for (chunk = loop->break_ip_pool.head, i = 0; chunk; chunk = chunk->next)
{
for (j = 0; j < MOO_COUNTOF(loop->break_ip_pool.static_chunk.buf) && i < loop->break_ip_pool.count; j++)
{
if (patch_long_forward_jump_instruction (moo, chunk->buf[j], BCODE_JUMP2_FORWARD, MOO_NULL) <= -1) return -1;
i++;
}
}
}
fini_oow_pool (moo, &loop->break_ip_pool);
moo_freemem (moo, loop);
return 0;
}
static MOO_INLINE int inject_break_to_loop (moo_t* moo)
{
if (add_to_oow_pool (moo, &moo->c->mth.loop->break_ip_pool, moo->c->mth.code.len) <= -1 ||
emit_single_param_instruction (moo, BCODE_JUMP_FORWARD_0, MAX_CODE_JUMP) <= -1) return -1;
return 0;
}
static int compile_block_expression (moo_t* moo)
@ -4380,74 +4461,10 @@ static int compile_conditional (moo_t* moo)
return 0;
}
typedef struct oow_pool_chunk_t oow_pool_chunk_t;
struct oow_pool_chunk_t
{
moo_oow_t buf[16];
oow_pool_chunk_t* next;
};
typedef struct oow_pool_t oow_pool_t;
struct oow_pool_t
{
oow_pool_chunk_t static_chunk;
oow_pool_chunk_t* head;
oow_pool_chunk_t* tail;
moo_oow_t count;
};
static void init_oow_pool (moo_t* moo, oow_pool_t* pool)
{
pool->count = 0;
pool->static_chunk.next = MOO_NULL;
pool->head = &pool->static_chunk;
pool->tail = &pool->static_chunk;
}
static void fini_oow_pool (moo_t* moo, oow_pool_t* pool)
{
oow_pool_chunk_t* chunk, * next;
/* dispose all chunks except the first static one */
chunk = pool->head->next;
while (chunk)
{
next = chunk->next;
moo_freemem (moo, chunk);
chunk = next;
}
/* this doesn't reinitialize the pool. call init_oow_pool()
* to reuse it */
}
static int add_to_oow_pool (moo_t* moo, oow_pool_t* pool, moo_oow_t v)
{
moo_oow_t idx;
idx = pool->count % MOO_COUNTOF(pool->static_chunk.buf);
if (pool->count > 0 && idx == 0)
{
oow_pool_chunk_t* chunk;
chunk = moo_allocmem (moo, MOO_SIZEOF(pool->static_chunk));
if (!chunk) return -1;
chunk->next = MOO_NULL;
pool->tail->next = chunk;
pool->tail = chunk;
}
pool->tail->buf[idx] = v;
pool->count++;
return 0;
}
static int compile_if_expression (moo_t* moo)
{
oow_pool_t jumptoend;
oow_pool_chunk_t* jumptoend_chunk;
moo_oow_pool_t jumptoend;
moo_oow_pool_chunk_t* jumptoend_chunk;
moo_oow_t i, j;
moo_oow_t jumptonext;
@ -4539,7 +4556,7 @@ static int compile_while_expression (moo_t* moo)
{
moo_ioloc_t while_loc, brace_loc;
moo_oow_t precondpos, postcondpos, prebbpos, postbbpos;
int cond_style = 0;
int cond_style = 0, loop_pushed = 0;
MOO_ASSERT (moo, TOKEN_TYPE(moo) == MOO_IOTOK_WHILE);
while_loc = *TOKEN_LOC(moo);
@ -4577,6 +4594,7 @@ static int compile_while_expression (moo_t* moo)
/* remember information about this while loop. */
if (push_loop (moo, precondpos) <= -1) goto oops;
loop_pushed = 1;
GET_TOKEN (moo); /* get { */
brace_loc = *TOKEN_LOC(moo);
@ -4623,14 +4641,16 @@ static int compile_while_expression (moo_t* moo)
moo->c->mth.code.len = precondpos;
}
/* destroy the loop information stored earlier in this function */
pop_loop (moo, 1);
/* push nil as a result of the while expression. TODO: is it the best value? anything else? */
if (emit_byte_instruction (moo, BCODE_PUSH_NIL) <= -1) goto oops;
/* destroy the loop information stored earlier in this function */
pop_loop (moo, moo->c->mth.code.len);
return 0;
oops:
if (loop_pushed) pop_loop (moo, 0);
return -1;
}
@ -4769,11 +4789,8 @@ oops:
return -1;
}
static int compile_block_statement (moo_t* moo)
static int compile_special_statement (moo_t* moo)
{
/* compile_block_statement() is a simpler version of
* of compile_method_statement(). it doesn't cater for
* popping the stack top */
if (TOKEN_TYPE(moo) == MOO_IOTOK_RETURN)
{
/* ^ - return - return to the sender of the origin */
@ -4790,70 +4807,70 @@ static int compile_block_statement (moo_t* moo)
}
else if (TOKEN_TYPE(moo) == MOO_IOTOK_BREAK)
{
/* TODO: compile break */
if (!moo->c->mth.loop)
{
/* break outside a loop */
set_syntax_error (moo, MOO_SYNERR_NOTINLOOP, TOKEN_LOC(moo), TOKEN_NAME(moo));
return -1;
}
if (moo->c->mth.loop->blkcount > 0)
{
/* break cannot cross boundary of a block */
set_syntax_error (moo, MOO_SYNERR_INBLOCK, TOKEN_LOC(moo), TOKEN_NAME(moo));
return -1;
}
GET_TOKEN (moo);
moo->errnum = MOO_ENOIMPL;
return -1;
GET_TOKEN (moo); /* read the next token to break */
return inject_break_to_loop (moo);
}
else if (TOKEN_TYPE(moo) == MOO_IOTOK_CONTINUE)
{
/* TODO: compile continue */
if (!moo->c->mth.loop)
{
/* continue outside a loop */
set_syntax_error (moo, MOO_SYNERR_NOTINLOOP, TOKEN_LOC(moo), TOKEN_NAME(moo));
return -1;
}
if (moo->c->mth.loop->blkcount > 0)
{
/* continue cannot cross boundary of a block */
set_syntax_error (moo, MOO_SYNERR_INBLOCK, TOKEN_LOC(moo), TOKEN_NAME(moo));
return -1;
}
GET_TOKEN (moo);
GET_TOKEN (moo); /* read the next token to continue */
return emit_backward_jump_instruction (moo, moo->c->mth.code.len - moo->c->mth.loop->startpos);
}
else
{
return compile_method_expression(moo, 0);
return 9999;
}
static int compile_block_statement (moo_t* moo)
{
/* compile_block_statement() is a simpler version of
* of compile_method_statement(). it doesn't cater for
* popping the stack top */
int n;
n = compile_special_statement(moo);
if (n <= -1) return -1;
if (n == 9999) n = compile_method_expression(moo, 0);
return n;
}
static int compile_method_statement (moo_t* moo)
{
/*
* method-statement := method-return-statement | method-expression
* method-statement := method-return-statement | break | continue | method-expression
* method-return-statement := "^" method-expression
*/
if (TOKEN_TYPE(moo) == MOO_IOTOK_RETURN)
{
/* handle the return statement */
GET_TOKEN (moo);
if (compile_method_expression(moo, 0) <= -1) return -1;
return emit_byte_instruction (moo, BCODE_RETURN_STACKTOP);
}
else if (TOKEN_TYPE(moo) == MOO_IOTOK_LOCAL_RETURN)
{
GET_TOKEN (moo);
if (compile_method_expression(moo, 0) <= -1) return -1;
return emit_byte_instruction (moo, BCODE_LOCAL_RETURN);
}
else
{
/* TODO: optimization. if expresssion is a literal, no push and pop are required */
int n;
n = compile_special_statement(moo);
if (n <= -1) return -1;
if (n == 9999)
{
/* TODO: optimization. if expresssion is a literal, no push and pop are required */
/* the second parameter to compile_method_expression() indicates
* that the stack top will eventually be popped off. the compiler
* can optimize some instruction sequencese. for example, two
@ -4870,9 +4887,9 @@ static int compile_method_statement (moo_t* moo)
{
return emit_byte_instruction (moo, BCODE_POP_STACKTOP);
}
return 0;
}
return n;
}
static int compile_method_statements (moo_t* moo)

6
moo/lib/err.c
View File

@ -124,6 +124,8 @@ static moo_ooch_t synerrstr_52[] = {'w','r','o','n','g',' ','n','a','m','e','s',
static moo_ooch_t synerrstr_53[] = {'w','r','o','n','g',' ','p','o','o','l',' ','d','i','c','t','i','o','n','a','r','y',' ','n','a','m','e','\0'};
static moo_ooch_t synerrstr_54[] = {'d','u','p','l','i','c','a','t','e',' ','p','o','o','l',' ','d','i','c','t','i','o','n','a','r','y',' ','n','a','m','e','\0'};
static moo_ooch_t synerrstr_55[] = {'l','i','t','e','r','a','l',' ','e','x','p','e','c','t','e','d','\0'};
static moo_ooch_t synerrstr_56[] = {'b','r','e','a','k',' ','o','r',' ','c','o','n','t','i','n','u','e',' ','n','o','t',' ','w','i','t','h','i','n',' ','a',' ','l','o','o','p','\0'};
static moo_ooch_t synerrstr_57[] = {'b','r','e','a','k',' ','o','r',' ','c','o','n','t','i','n','u','e',' ','w','i','t','h','i','n',' ','a',' ','b','l','o','c','k','\0'};
static moo_ooch_t* synerrstr[] =
{
synerrstr_0, synerrstr_1, synerrstr_2, synerrstr_3, synerrstr_4, synerrstr_5, synerrstr_6, synerrstr_7,
@ -132,9 +134,9 @@ static moo_ooch_t* synerrstr[] =
synerrstr_24, synerrstr_25, synerrstr_26, synerrstr_27, synerrstr_28, synerrstr_29, synerrstr_30, synerrstr_31,
synerrstr_32, synerrstr_33, synerrstr_34, synerrstr_35, synerrstr_36, synerrstr_37, synerrstr_38, synerrstr_39,
synerrstr_40, synerrstr_41, synerrstr_42, synerrstr_43, synerrstr_44, synerrstr_45, synerrstr_46, synerrstr_47,
synerrstr_48, synerrstr_49, synerrstr_50, synerrstr_51, synerrstr_52, synerrstr_53, synerrstr_54, synerrstr_55
synerrstr_48, synerrstr_49, synerrstr_50, synerrstr_51, synerrstr_52, synerrstr_53, synerrstr_54, synerrstr_55,
synerrstr_56, synerrstr_57
};
#endif
/* END: GENERATED WITH generr.st */

20
moo/lib/moo-prv.h
View File

@ -358,12 +358,28 @@ struct moo_code_t
moo_oow_t len;
};
typedef struct moo_oow_pool_chunk_t moo_oow_pool_chunk_t;
struct moo_oow_pool_chunk_t
{
moo_oow_t buf[16];
moo_oow_pool_chunk_t* next;
};
typedef struct moo_oow_pool_t moo_oow_pool_t;
struct moo_oow_pool_t
{
moo_oow_pool_chunk_t static_chunk;
moo_oow_pool_chunk_t* head;
moo_oow_pool_chunk_t* tail;
moo_oow_t count;
};
typedef struct moo_loop_t moo_loop_t;
struct moo_loop_t
{
moo_oow_t startpos;
/* TODO: links of break instructions */
moo_oow_t blkcount; /* number of inner blocks enclosed in squre brackets */
moo_oow_pool_t break_ip_pool; /* a pool that holds break instruction pointer */
moo_oow_t blkcount; /* number of inner blocks enclosed in square brackets */
moo_loop_t* next;
};

4
moo/lib/moo.h
View File

@ -1146,7 +1146,9 @@ enum moo_synerrnum_t
MOO_SYNERR_NAMESPACE, /* wrong namespace name */
MOO_SYNERR_POOLDIC, /* wrong pool dictionary */
MOO_SYNERR_POOLDICDUP, /* duplicate pool dictionary */
MOO_SYNERR_LITERAL /* literal expected */
MOO_SYNERR_LITERAL, /* literal expected */
MOO_SYNERR_NOTINLOOP, /* break or continue not within a loop */
MOO_SYNERR_INBLOCK /* break or continue within a block */
};
typedef enum moo_synerrnum_t moo_synerrnum_t;