static void note_addressable (tree, stmt_ann_t);
static void get_expr_operands (tree, tree *, int, voperands_t);
static void get_asm_expr_operands (tree, voperands_t);
+static void get_indirect_ref_operands (tree, tree, int, voperands_t);
+static void get_call_expr_operands (tree, tree, voperands_t);
static inline void append_def (tree *, tree);
static inline void append_use (tree *, tree);
static void append_v_may_def (tree, tree, voperands_t);
code = TREE_CODE (expr);
class = TREE_CODE_CLASS (code);
- /* We could have the address of a component, array member, etc which
- has interesting variable references. */
- if (code == ADDR_EXPR)
+ switch (code)
{
+ case ADDR_EXPR:
+ /* We could have the address of a component, array member,
+ etc which has interesting variable references. */
/* Taking the address of a variable does not represent a
reference to it, but the fact that STMT takes its address will be
of interest to some passes (e.g. alias resolution). */
does not allow non-registers as array indices). */
flags |= opf_no_vops;
- /* Avoid recursion. */
- expr_p = &TREE_OPERAND (expr, 0);
- expr = *expr_p;
- code = TREE_CODE (expr);
- class = TREE_CODE_CLASS (code);
- }
-
- /* Expressions that make no memory references. */
- if (class == 'c'
- || class == 't'
- || code == BLOCK
- || code == FUNCTION_DECL
- || code == EXC_PTR_EXPR
- || code == FILTER_EXPR
- || code == LABEL_DECL)
- return;
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags, prev_vops);
+ return;
- /* If we found a variable, add it to DEFS or USES depending on the
- operand flags. */
- if (SSA_VAR_P (expr))
- {
+ case SSA_NAME:
+ case VAR_DECL:
+ case PARM_DECL:
+ case RESULT_DECL:
+ /* If we found a variable, add it to DEFS or USES depending
+ on the operand flags. */
add_stmt_operand (expr_p, stmt, flags, prev_vops);
return;
- }
-
- /* Pointer dereferences always represent a use of the base pointer. */
- if (code == INDIRECT_REF)
- {
- tree *pptr = &TREE_OPERAND (expr, 0);
- tree ptr = *pptr;
- if (SSA_VAR_P (ptr))
- {
- if (!aliases_computed_p)
- {
- /* If the pointer does not have a memory tag and aliases have not
- been computed yet, mark the statement as having volatile
- operands to prevent DOM from entering it in equivalence tables
- and DCE from killing it. */
- stmt_ann (stmt)->has_volatile_ops = true;
- }
- else
- {
- struct ptr_info_def *pi = NULL;
-
- /* If we have computed aliasing already, check if PTR has
- flow-sensitive points-to information. */
- if (TREE_CODE (ptr) == SSA_NAME
- && (pi = SSA_NAME_PTR_INFO (ptr)) != NULL
- && pi->name_mem_tag)
- {
- /* PTR has its own memory tag. Use it. */
- add_stmt_operand (&pi->name_mem_tag, stmt, flags,
- prev_vops);
- }
- else
- {
- /* If PTR is not an SSA_NAME or it doesn't have a name
- tag, use its type memory tag. */
- var_ann_t ann;
-
- /* If we are emitting debugging dumps, display a warning if
- PTR is an SSA_NAME with no flow-sensitive alias
- information. That means that we may need to compute
- aliasing again. */
- if (dump_file
- && TREE_CODE (ptr) == SSA_NAME
- && pi == NULL)
- {
- fprintf (dump_file,
- "NOTE: no flow-sensitive alias info for ");
- print_generic_expr (dump_file, ptr, dump_flags);
- fprintf (dump_file, " in ");
- print_generic_stmt (dump_file, stmt, dump_flags);
- }
-
- if (TREE_CODE (ptr) == SSA_NAME)
- ptr = SSA_NAME_VAR (ptr);
- ann = var_ann (ptr);
- add_stmt_operand (&ann->type_mem_tag, stmt, flags, prev_vops);
- }
- }
- }
-
- /* If a constant is used as a pointer, we can't generate a real
- operand for it but we mark the statement volatile to prevent
- optimizations from messing things up. */
- else if (TREE_CODE (ptr) == INTEGER_CST)
- {
- stmt_ann (stmt)->has_volatile_ops = true;
- return;
- }
-
- /* Everything else *should* have been folded elsewhere, but users
- are smarter than we in finding ways to write invalid code. We
- cannot just abort here. If we were absolutely certain that we
- do handle all valid cases, then we could just do nothing here.
- That seems optimistic, so attempt to do something logical... */
- else if ((TREE_CODE (ptr) == PLUS_EXPR || TREE_CODE (ptr) == MINUS_EXPR)
- && TREE_CODE (TREE_OPERAND (ptr, 0)) == ADDR_EXPR
- && TREE_CODE (TREE_OPERAND (ptr, 1)) == INTEGER_CST)
- {
- /* Make sure we know the object is addressable. */
- pptr = &TREE_OPERAND (ptr, 0);
- add_stmt_operand (pptr, stmt, 0, NULL);
-
- /* Mark the object itself with a VUSE. */
- pptr = &TREE_OPERAND (*pptr, 0);
- get_expr_operands (stmt, pptr, flags, prev_vops);
- return;
- }
-
- /* Ok, this isn't even is_gimple_min_invariant. Something's broke. */
- else
- abort ();
-
- /* Add a USE operand for the base pointer. */
- get_expr_operands (stmt, pptr, opf_none, prev_vops);
+ case INDIRECT_REF:
+ get_indirect_ref_operands (stmt, expr, flags, prev_vops);
return;
- }
- /* Treat array references as references to the virtual variable
- representing the array. The virtual variable for an ARRAY_REF
- is the VAR_DECL for the array. */
- if (code == ARRAY_REF || code == ARRAY_RANGE_REF)
- {
+ case ARRAY_REF:
+ case ARRAY_RANGE_REF:
+ /* Treat array references as references to the virtual variable
+ representing the array. The virtual variable for an ARRAY_REF
+ is the VAR_DECL for the array. */
+
/* Add the virtual variable for the ARRAY_REF to VDEFS or VUSES
according to the value of IS_DEF. Recurse if the LHS of the
ARRAY_REF node is not a regular variable. */
get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none, prev_vops);
get_expr_operands (stmt, &TREE_OPERAND (expr, 3), opf_none, prev_vops);
return;
- }
- /* Similarly to arrays, references to compound variables (complex types
- and structures/unions) are globbed.
+ case COMPONENT_REF:
+ case REALPART_EXPR:
+ case IMAGPART_EXPR:
+ /* Similarly to arrays, references to compound variables (complex
+ types and structures/unions) are globbed.
- FIXME: This means that
+ FIXME: This means that
a.x = 6;
a.y = 7;
foo (a.x, a.y);
- will not be constant propagated because the two partial
- definitions to 'a' will kill each other. Note that SRA may be
- able to fix this problem if 'a' can be scalarized. */
- if (code == IMAGPART_EXPR || code == REALPART_EXPR || code == COMPONENT_REF)
- {
+ will not be constant propagated because the two partial
+ definitions to 'a' will kill each other. Note that SRA may be
+ able to fix this problem if 'a' can be scalarized. */
+
/* If the LHS of the compound reference is not a regular variable,
recurse to keep looking for more operands in the subexpression. */
if (SSA_VAR_P (TREE_OPERAND (expr, 0)))
if (code == COMPONENT_REF)
get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none, prev_vops);
return;
- }
-
- /* Function calls. Add every argument to USES. If the callee is
- neither pure nor const, create a VDEF reference for GLOBAL_VAR
- (See find_vars_r). */
- if (code == CALL_EXPR)
- {
- tree op;
- int call_flags = call_expr_flags (expr);
-
- /* Find uses in the called function. */
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_none, prev_vops);
-
- for (op = TREE_OPERAND (expr, 1); op; op = TREE_CHAIN (op))
- get_expr_operands (stmt, &TREE_VALUE (op), opf_none, prev_vops);
-
- get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none, prev_vops);
-
- if (bitmap_first_set_bit (call_clobbered_vars) >= 0)
- {
- /* A 'pure' or a 'const' functions never call clobber anything.
- A 'noreturn' function might, but since we don't return anyway
- there is no point in recording that. */
- if (!(call_flags
- & (ECF_PURE | ECF_CONST | ECF_NORETURN)))
- add_call_clobber_ops (stmt, prev_vops);
- else if (!(call_flags & (ECF_CONST | ECF_NORETURN)))
- add_call_read_ops (stmt, prev_vops);
- }
- else if (!aliases_computed_p)
- stmt_ann (stmt)->has_volatile_ops = true;
+ case WITH_SIZE_EXPR:
+ /* WITH_SIZE_EXPR is a pass-through reference to it's first argument,
+ and an rvalue reference to its second argument. */
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none, prev_vops);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags, prev_vops);
return;
- }
-
- /* Lists. */
- if (code == TREE_LIST)
- {
- tree op;
-
- for (op = expr; op; op = TREE_CHAIN (op))
- get_expr_operands (stmt, &TREE_VALUE (op), flags, prev_vops);
+ case CALL_EXPR:
+ get_call_expr_operands (stmt, expr, prev_vops);
return;
- }
- /* Assignments. */
- if (code == MODIFY_EXPR)
- {
- get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none, prev_vops);
- if (TREE_CODE (TREE_OPERAND (expr, 0)) == ARRAY_REF
- || TREE_CODE (TREE_OPERAND (expr, 0)) == COMPONENT_REF
- || TREE_CODE (TREE_OPERAND (expr, 0)) == REALPART_EXPR
- || TREE_CODE (TREE_OPERAND (expr, 0)) == IMAGPART_EXPR)
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_is_def,
- prev_vops);
- else
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0),
- opf_is_def | opf_kill_def, prev_vops);
- return;
- }
+ case MODIFY_EXPR:
+ {
+ int subflags;
+ tree op;
+
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), opf_none, prev_vops);
+
+ op = TREE_OPERAND (expr, 0);
+ if (TREE_CODE (op) == WITH_SIZE_EXPR)
+ op = TREE_OPERAND (expr, 0);
+ if (TREE_CODE (op) == ARRAY_REF
+ || TREE_CODE (op) == COMPONENT_REF
+ || TREE_CODE (op) == REALPART_EXPR
+ || TREE_CODE (op) == IMAGPART_EXPR)
+ subflags = opf_is_def;
+ else
+ subflags = opf_is_def | opf_kill_def;
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), subflags, prev_vops);
+ return;
+ }
- /* Mark VA_ARG_EXPR nodes as making volatile references. FIXME,
- this is needed because we currently do not gimplify VA_ARG_EXPR
- properly. */
- if (code == VA_ARG_EXPR)
- {
+ case VA_ARG_EXPR:
+ /* Mark VA_ARG_EXPR nodes as making volatile references. FIXME,
+ this is needed because we currently do not gimplify VA_ARG_EXPR
+ properly. */
stmt_ann (stmt)->has_volatile_ops = true;
return;
- }
- /* Unary expressions. */
- if (class == '1'
- || code == TRUTH_NOT_EXPR
- || code == BIT_FIELD_REF
- || code == CONSTRUCTOR)
- {
+ case TRUTH_NOT_EXPR:
+ case BIT_FIELD_REF:
+ do_unary:
get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags, prev_vops);
return;
- }
- /* Binary expressions. */
- if (class == '2'
- || class == '<'
- || code == TRUTH_AND_EXPR
- || code == TRUTH_OR_EXPR
- || code == TRUTH_XOR_EXPR
- || code == COMPOUND_EXPR
- || code == OBJ_TYPE_REF)
- {
- tree op0 = TREE_OPERAND (expr, 0);
- tree op1 = TREE_OPERAND (expr, 1);
+ case TRUTH_AND_EXPR:
+ case TRUTH_OR_EXPR:
+ case TRUTH_XOR_EXPR:
+ case COMPOUND_EXPR:
+ case OBJ_TYPE_REF:
+ do_binary:
+ {
+ tree op0 = TREE_OPERAND (expr, 0);
+ tree op1 = TREE_OPERAND (expr, 1);
- /* If it would be profitable to swap the operands, then do so to
- canonicalize the statement, enabling better optimization.
+ /* If it would be profitable to swap the operands, then do so to
+ canonicalize the statement, enabling better optimization.
- By placing canonicalization of such expressions here we
- transparently keep statements in canonical form, even
- when the statement is modified. */
- if (tree_swap_operands_p (op0, op1, false))
- {
- /* For relationals we need to swap the operands and change
- the code. */
- if (code == LT_EXPR
- || code == GT_EXPR
- || code == LE_EXPR
- || code == GE_EXPR)
- {
- TREE_SET_CODE (expr, swap_tree_comparison (code));
- TREE_OPERAND (expr, 0) = op1;
- TREE_OPERAND (expr, 1) = op0;
- }
+ By placing canonicalization of such expressions here we
+ transparently keep statements in canonical form, even
+ when the statement is modified. */
+ if (tree_swap_operands_p (op0, op1, false))
+ {
+ /* For relationals we need to swap the operands
+ and change the code. */
+ if (code == LT_EXPR
+ || code == GT_EXPR
+ || code == LE_EXPR
+ || code == GE_EXPR)
+ {
+ TREE_SET_CODE (expr, swap_tree_comparison (code));
+ TREE_OPERAND (expr, 0) = op1;
+ TREE_OPERAND (expr, 1) = op0;
+ }
- /* For a commutative operator we can just swap the operands. */
- if (commutative_tree_code (code))
- {
- TREE_OPERAND (expr, 0) = op1;
- TREE_OPERAND (expr, 1) = op0;
- }
- }
+ /* For a commutative operator we can just swap the operands. */
+ else if (commutative_tree_code (code))
+ {
+ TREE_OPERAND (expr, 0) = op1;
+ TREE_OPERAND (expr, 1) = op0;
+ }
+ }
- get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags, prev_vops);
- get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags, prev_vops);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), flags, prev_vops);
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 1), flags, prev_vops);
+ return;
+ }
+
+ case BLOCK:
+ case FUNCTION_DECL:
+ case EXC_PTR_EXPR:
+ case FILTER_EXPR:
+ case LABEL_DECL:
+ case CONSTRUCTOR:
+ /* Expressions that make no memory references. */
return;
+
+ default:
+ if (class == '1')
+ goto do_unary;
+ if (class == '2' || class == '<')
+ goto do_binary;
+ if (class == 'c' || class == 't')
+ return;
}
/* If we get here, something has gone wrong. */
}
}
+/* A subroutine of get_expr_operands to handle INDIRECT_REF. */
+
+static void
+get_indirect_ref_operands (tree stmt, tree expr, int flags,
+ voperands_t prev_vops)
+{
+ tree *pptr = &TREE_OPERAND (expr, 0);
+ tree ptr = *pptr;
+
+ if (SSA_VAR_P (ptr))
+ {
+ if (!aliases_computed_p)
+ {
+ /* If the pointer does not have a memory tag and aliases have not
+ been computed yet, mark the statement as having volatile
+ operands to prevent DOM from entering it in equivalence tables
+ and DCE from killing it. */
+ stmt_ann (stmt)->has_volatile_ops = true;
+ }
+ else
+ {
+ struct ptr_info_def *pi = NULL;
+
+ /* If we have computed aliasing already, check if PTR has
+ flow-sensitive points-to information. */
+ if (TREE_CODE (ptr) == SSA_NAME
+ && (pi = SSA_NAME_PTR_INFO (ptr)) != NULL
+ && pi->name_mem_tag)
+ {
+ /* PTR has its own memory tag. Use it. */
+ add_stmt_operand (&pi->name_mem_tag, stmt, flags, prev_vops);
+ }
+ else
+ {
+ /* If PTR is not an SSA_NAME or it doesn't have a name
+ tag, use its type memory tag. */
+ var_ann_t ann;
+
+ /* If we are emitting debugging dumps, display a warning if
+ PTR is an SSA_NAME with no flow-sensitive alias
+ information. That means that we may need to compute
+ aliasing again. */
+ if (dump_file
+ && TREE_CODE (ptr) == SSA_NAME
+ && pi == NULL)
+ {
+ fprintf (dump_file,
+ "NOTE: no flow-sensitive alias info for ");
+ print_generic_expr (dump_file, ptr, dump_flags);
+ fprintf (dump_file, " in ");
+ print_generic_stmt (dump_file, stmt, dump_flags);
+ }
+
+ if (TREE_CODE (ptr) == SSA_NAME)
+ ptr = SSA_NAME_VAR (ptr);
+ ann = var_ann (ptr);
+ add_stmt_operand (&ann->type_mem_tag, stmt, flags, prev_vops);
+ }
+ }
+ }
+
+ /* If a constant is used as a pointer, we can't generate a real
+ operand for it but we mark the statement volatile to prevent
+ optimizations from messing things up. */
+ else if (TREE_CODE (ptr) == INTEGER_CST)
+ {
+ stmt_ann (stmt)->has_volatile_ops = true;
+ return;
+ }
+
+ /* Everything else *should* have been folded elsewhere, but users
+ are smarter than we in finding ways to write invalid code. We
+ cannot just abort here. If we were absolutely certain that we
+ do handle all valid cases, then we could just do nothing here.
+ That seems optimistic, so attempt to do something logical... */
+ else if ((TREE_CODE (ptr) == PLUS_EXPR || TREE_CODE (ptr) == MINUS_EXPR)
+ && TREE_CODE (TREE_OPERAND (ptr, 0)) == ADDR_EXPR
+ && TREE_CODE (TREE_OPERAND (ptr, 1)) == INTEGER_CST)
+ {
+ /* Make sure we know the object is addressable. */
+ pptr = &TREE_OPERAND (ptr, 0);
+ add_stmt_operand (pptr, stmt, 0, NULL);
+
+ /* Mark the object itself with a VUSE. */
+ pptr = &TREE_OPERAND (*pptr, 0);
+ get_expr_operands (stmt, pptr, flags, prev_vops);
+ return;
+ }
+
+ /* Ok, this isn't even is_gimple_min_invariant. Something's broke. */
+ else
+ abort ();
+
+ /* Add a USE operand for the base pointer. */
+ get_expr_operands (stmt, pptr, opf_none, prev_vops);
+}
+
+/* A subroutine of get_expr_operands to handle CALL_EXPR. */
+
+static void
+get_call_expr_operands (tree stmt, tree expr, voperands_t prev_vops)
+{
+ tree op;
+ int call_flags = call_expr_flags (expr);
+
+ /* Find uses in the called function. */
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 0), opf_none, prev_vops);
+
+ for (op = TREE_OPERAND (expr, 1); op; op = TREE_CHAIN (op))
+ get_expr_operands (stmt, &TREE_VALUE (op), opf_none, prev_vops);
+
+ get_expr_operands (stmt, &TREE_OPERAND (expr, 2), opf_none, prev_vops);
+
+ if (bitmap_first_set_bit (call_clobbered_vars) >= 0)
+ {
+ /* A 'pure' or a 'const' functions never call clobber anything.
+ A 'noreturn' function might, but since we don't return anyway
+ there is no point in recording that. */
+ if (!(call_flags
+ & (ECF_PURE | ECF_CONST | ECF_NORETURN)))
+ add_call_clobber_ops (stmt, prev_vops);
+ else if (!(call_flags & (ECF_CONST | ECF_NORETURN)))
+ add_call_read_ops (stmt, prev_vops);
+ }
+ else if (!aliases_computed_p)
+ stmt_ann (stmt)->has_volatile_ops = true;
+}
+
/* Add *VAR_P to the appropriate operand array of STMT. FLAGS is as in
get_expr_operands. If *VAR_P is a GIMPLE register, it will be added to
sym = (TREE_CODE (var) == SSA_NAME ? SSA_NAME_VAR (var) : var);
v_ann = var_ann (sym);
- /* FIXME: We currently refuse to optimize variables that have hidden uses
- (variables used in VLA declarations, MD builtin calls and variables
- from the parent function in nested functions). This is because not
- all uses of these variables are exposed in the IL or the statements
- that reference them are not in GIMPLE form. If that's the case, mark
- the statement as having volatile operands and return. */
- if (v_ann->has_hidden_use)
- {
- s_ann->has_volatile_ops = true;
- return;
- }
-
/* Don't expose volatile variables to the optimizers. */
if (TREE_THIS_VOLATILE (sym))
{
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