mirror of https://github.com/python/cpython
Update comments, remove commented out code.
Move assembler structure next to assembler code to make it easier to move it to a separate file.
This commit is contained in:
Neal Norwitz
parent
7a4e804469
commit
f733a013b2
118
Python/compile.c
118
Python/compile.c
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@ -6,9 +6,10 @@
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* object:
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* 1. Checks for future statements. See future.c
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* 2. Builds a symbol table. See symtable.c.
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* 3. Generate code for basic blocks. See compiler_mod() in this file.
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* 3. Generate code for basic blocks. See compiler_mod() in this file.
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* 4. Assemble the basic blocks into final code. See assemble() in
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* this file.
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* this file.
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* 5. Optimize the byte code (peephole optimizations). See peephole.c
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*
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* Note that compiler_mod() suggests module, but the module ast type
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* (mod_ty) has cases for expressions and interactive statements.
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@ -16,7 +17,8 @@
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* CAUTION: The VISIT_* macros abort the current function when they
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* encounter a problem. So don't invoke them when there is memory
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* which needs to be released. Code blocks are OK, as the compiler
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* structure takes care of releasing those.
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* structure takes care of releasing those. Use the arena to manage
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* objects.
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*/
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#include "Python.h"
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@ -32,16 +34,6 @@
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int Py_OptimizeFlag = 0;
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/*
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ISSUES:
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opcode_stack_effect() function should be reviewed since stack depth bugs
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could be really hard to find later.
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Dead code is being generated (i.e. after unconditional jumps).
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XXX(nnorwitz): not sure this is still true
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*/
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#define DEFAULT_BLOCK_SIZE 16
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#define DEFAULT_BLOCKS 8
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#define DEFAULT_CODE_SIZE 128
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@ -115,11 +107,11 @@ struct compiler_unit {
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PyObject *u_private; /* for private name mangling */
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int u_argcount; /* number of arguments for block */
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/* Pointer to the most recently allocated block. By following b_list
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members, you can reach all early allocated blocks. */
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/* Pointer to the most recently allocated block. By following b_list
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members, you can reach all early allocated blocks. */
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basicblock *u_blocks;
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basicblock *u_curblock; /* pointer to current block */
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int u_tmpname; /* temporary variables for list comps */
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int u_tmpname; /* temporary variables for list comps */
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int u_nfblocks;
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struct fblockinfo u_fblock[CO_MAXBLOCKS];
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@ -152,17 +144,6 @@ struct compiler {
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PyArena *c_arena; /* pointer to memory allocation arena */
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};
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struct assembler {
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PyObject *a_bytecode; /* string containing bytecode */
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int a_offset; /* offset into bytecode */
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int a_nblocks; /* number of reachable blocks */
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basicblock **a_postorder; /* list of blocks in dfs postorder */
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PyObject *a_lnotab; /* string containing lnotab */
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int a_lnotab_off; /* offset into lnotab */
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int a_lineno; /* last lineno of emitted instruction */
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int a_lineno_off; /* bytecode offset of last lineno */
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};
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static int compiler_enter_scope(struct compiler *, identifier, void *, int);
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static void compiler_free(struct compiler *);
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static basicblock *compiler_new_block(struct compiler *);
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@ -396,47 +377,6 @@ dictbytype(PyObject *src, int scope_type, int flag, int offset)
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return dest;
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}
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/*
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Leave this debugging code for just a little longer.
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static void
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compiler_display_symbols(PyObject *name, PyObject *symbols)
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{
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PyObject *key, *value;
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int flags;
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Py_ssize_t pos = 0;
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fprintf(stderr, "block %s\n", PyString_AS_STRING(name));
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while (PyDict_Next(symbols, &pos, &key, &value)) {
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flags = PyInt_AsLong(value);
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fprintf(stderr, "var %s:", PyString_AS_STRING(key));
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if (flags & DEF_GLOBAL)
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fprintf(stderr, " declared_global");
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if (flags & DEF_LOCAL)
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fprintf(stderr, " local");
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if (flags & DEF_PARAM)
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fprintf(stderr, " param");
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if (flags & DEF_STAR)
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fprintf(stderr, " stararg");
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if (flags & DEF_DOUBLESTAR)
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fprintf(stderr, " starstar");
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if (flags & DEF_INTUPLE)
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fprintf(stderr, " tuple");
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if (flags & DEF_FREE)
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fprintf(stderr, " free");
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if (flags & DEF_FREE_GLOBAL)
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fprintf(stderr, " global");
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if (flags & DEF_FREE_CLASS)
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fprintf(stderr, " free/class");
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if (flags & DEF_IMPORT)
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fprintf(stderr, " import");
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fprintf(stderr, "\n");
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}
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fprintf(stderr, "\n");
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}
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*/
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static void
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compiler_unit_check(struct compiler_unit *u)
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{
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@ -610,7 +550,7 @@ compiler_new_block(struct compiler *c)
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return NULL;
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}
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memset((void *)b, 0, sizeof(basicblock));
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/* Extend the singly linked list of blocks with new block. */
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/* Extend the singly linked list of blocks with new block. */
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b->b_list = u->u_blocks;
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u->u_blocks = b;
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return b;
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@ -649,7 +589,7 @@ compiler_use_next_block(struct compiler *c, basicblock *block)
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/* Returns the offset of the next instruction in the current block's
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b_instr array. Resizes the b_instr as necessary.
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Returns -1 on failure.
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*/
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*/
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static int
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compiler_next_instr(struct compiler *c, basicblock *b)
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@ -693,7 +633,7 @@ compiler_next_instr(struct compiler *c, basicblock *b)
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already been set. If it has been set, the call has no effect.
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Every time a new node is b
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*/
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*/
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static void
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compiler_set_lineno(struct compiler *c, int off)
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@ -1055,8 +995,8 @@ compiler_addop_j(struct compiler *c, int opcode, basicblock *b, int absolute)
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from the current block to the new block.
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*/
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/* XXX The returns inside these macros make it impossible to decref
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objects created in the local function.
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/* The returns inside these macros make it impossible to decref objects
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created in the local function. Local objects should use the arena.
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*/
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@ -2060,7 +2000,7 @@ compiler_visit_stmt(struct compiler *c, stmt_ty s)
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{
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int i, n;
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/* Always assign a lineno to the next instruction for a stmt. */
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/* Always assign a lineno to the next instruction for a stmt. */
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c->u->u_lineno = s->lineno;
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c->u->u_lineno_set = false;
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@ -2519,7 +2459,6 @@ compiler_compare(struct compiler *c, expr_ty e)
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}
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return 1;
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}
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#undef CMPCAST
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static int
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compiler_call(struct compiler *c, expr_ty e)
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@ -2933,9 +2872,9 @@ compiler_visit_expr(struct compiler *c, expr_ty e)
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{
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int i, n;
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/* If expr e has a different line number than the last expr/stmt,
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set a new line number for the next instruction.
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*/
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/* If expr e has a different line number than the last expr/stmt,
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set a new line number for the next instruction.
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*/
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if (e->lineno > c->u->u_lineno) {
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c->u->u_lineno = e->lineno;
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c->u->u_lineno_set = false;
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@ -2979,14 +2918,6 @@ compiler_visit_expr(struct compiler *c, expr_ty e)
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case Yield_kind:
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if (c->u->u_ste->ste_type != FunctionBlock)
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return compiler_error(c, "'yield' outside function");
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/*
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for (i = 0; i < c->u->u_nfblocks; i++) {
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if (c->u->u_fblock[i].fb_type == FINALLY_TRY)
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return compiler_error(
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c, "'yield' not allowed in a 'try' "
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"block with a 'finally' clause");
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}
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*/
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if (e->v.Yield.value) {
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VISIT(c, expr, e->v.Yield.value);
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}
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@ -3317,7 +3248,6 @@ compiler_visit_nested_slice(struct compiler *c, slice_ty s,
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return 1;
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}
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static int
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compiler_visit_slice(struct compiler *c, slice_ty s, expr_context_ty ctx)
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{
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@ -3365,12 +3295,26 @@ compiler_visit_slice(struct compiler *c, slice_ty s, expr_context_ty ctx)
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return compiler_handle_subscr(c, kindname, ctx);
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}
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/* End of the compiler section, beginning of the assembler section */
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/* do depth-first search of basic block graph, starting with block.
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post records the block indices in post-order.
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XXX must handle implicit jumps from one block to next
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*/
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struct assembler {
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PyObject *a_bytecode; /* string containing bytecode */
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int a_offset; /* offset into bytecode */
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int a_nblocks; /* number of reachable blocks */
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basicblock **a_postorder; /* list of blocks in dfs postorder */
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PyObject *a_lnotab; /* string containing lnotab */
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int a_lnotab_off; /* offset into lnotab */
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int a_lineno; /* last lineno of emitted instruction */
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int a_lineno_off; /* bytecode offset of last lineno */
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};
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static void
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dfs(struct compiler *c, basicblock *b, struct assembler *a)
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{
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