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| Original file line number | Diff line number | Diff line change |
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| // Compiler implementation of the D programming language | ||
| // Copyright (c) 1999-2011 by Digital Mars | ||
| // All Rights Reserved | ||
| // written by Walter Bright | ||
| // http://www.digitalmars.com | ||
| // License for redistribution is by either the Artistic License | ||
| // in artistic.txt, or the GNU General Public License in gnu.txt. | ||
| // See the included readme.txt for details. | ||
|
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| #include <stdio.h> | ||
| #include <assert.h> | ||
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| #include "mars.h" | ||
| #include "init.h" | ||
| #include "expression.h" | ||
| #include "template.h" | ||
| #include "statement.h" | ||
| #include "mtype.h" | ||
| #include "utf.h" | ||
| #include "declaration.h" | ||
| #include "aggregate.h" | ||
| #include "scope.h" | ||
| #include "attrib.h" | ||
|
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| int lambdaHasSideEffect(Expression *e, void *param); | ||
|
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| /******************************************** | ||
| * Determine if Expression has any side effects. | ||
| */ | ||
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| bool Expression::hasSideEffect() | ||
| { | ||
| bool has = FALSE; | ||
| apply(&lambdaHasSideEffect, &has); | ||
| return has; | ||
| } | ||
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| int lambdaHasSideEffect(Expression *e, void *param) | ||
| { | ||
| bool *phas = (bool *)param; | ||
| switch (e->op) | ||
| { | ||
| // Sort the cases by most frequently used first | ||
| case TOKassign: | ||
| case TOKplusplus: | ||
| case TOKminusminus: | ||
| case TOKdeclaration: | ||
| case TOKconstruct: | ||
| case TOKblit: | ||
| case TOKaddass: | ||
| case TOKminass: | ||
| case TOKcatass: | ||
| case TOKmulass: | ||
| case TOKdivass: | ||
| case TOKmodass: | ||
| case TOKshlass: | ||
| case TOKshrass: | ||
| case TOKushrass: | ||
| case TOKandass: | ||
| case TOKorass: | ||
| case TOKxorass: | ||
| case TOKpowass: | ||
| case TOKin: | ||
| case TOKremove: | ||
| case TOKassert: | ||
| case TOKhalt: | ||
| case TOKdelete: | ||
| case TOKnew: | ||
| case TOKnewanonclass: | ||
| *phas = TRUE; | ||
| break; | ||
|
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| case TOKcall: | ||
| { CallExp *ce = (CallExp *)e; | ||
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| /* Calling a function or delegate that is pure nothrow | ||
| * has no side effects. | ||
| */ | ||
| if (ce->e1->type) | ||
| { | ||
| Type *t = ce->e1->type->toBasetype(); | ||
| if ((t->ty == Tfunction && ((TypeFunction *)t)->purity > PUREweak && | ||
| ((TypeFunction *)t)->isnothrow) | ||
| || | ||
| (t->ty == Tdelegate && ((TypeFunction *)((TypeDelegate *)t)->next)->purity > PUREweak && | ||
| ((TypeFunction *)((TypeDelegate *)t)->next)->isnothrow) | ||
| ) | ||
| { | ||
| } | ||
| else | ||
| *phas = TRUE; | ||
| } | ||
| break; | ||
| } | ||
|
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| case TOKcast: | ||
| { CastExp *ce = (CastExp *)e; | ||
|
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| /* if: | ||
| * cast(classtype)func() // because it may throw | ||
| */ | ||
| if (ce->to->ty == Tclass && ce->e1->op == TOKcall && ce->e1->type->ty == Tclass) | ||
| *phas = TRUE; | ||
| break; | ||
| } | ||
|
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| default: | ||
| break; | ||
| } | ||
| return *phas; // stop walking if we determine this expression has side effects | ||
| } |
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