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author | Daniel Jacobowitz <drow@false.org> | 2009-07-21 18:12:40 +0000 |
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committer | Daniel Jacobowitz <drow@false.org> | 2009-07-21 18:12:40 +0000 |
commit | 828d3400fb1a9914ab16ee05dfe2647af8c566c5 (patch) | |
tree | 139f5ce0617cc046f8cbec6eb8a2381d838e80d0 /gdb/value.c | |
parent | 711eedefee89e6a9cb45e4967a523a7f9d516751 (diff) | |
download | gdb-828d3400fb1a9914ab16ee05dfe2647af8c566c5.zip gdb-828d3400fb1a9914ab16ee05dfe2647af8c566c5.tar.gz gdb-828d3400fb1a9914ab16ee05dfe2647af8c566c5.tar.bz2 |
gdb/
* value.c (struct value): Add reference_count field.
(allocate_value_lazy): Initialize reference_count.
(value_incref): New function.
(value_free): Check the reference count.
* value.h (value_incref): New prototype.
Diffstat (limited to 'gdb/value.c')
-rw-r--r-- | gdb/value.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/gdb/value.c b/gdb/value.c index fffc183..904bd5e 100644 --- a/gdb/value.c +++ b/gdb/value.c @@ -194,6 +194,13 @@ struct value /* Actual contents of the value. Target byte-order. NULL or not valid if lazy is nonzero. */ gdb_byte *contents; + + /* The number of references to this value. When a value is created, + the value chain holds a reference, so REFERENCE_COUNT is 1. If + release_value is called, this value is removed from the chain but + the caller of release_value now has a reference to this value. + The caller must arrange for a call to value_free later. */ + int reference_count; }; /* Prototypes for local functions. */ @@ -259,6 +266,10 @@ allocate_value_lazy (struct type *type) val->pointed_to_offset = 0; val->modifiable = 1; val->initialized = 1; /* Default to initialized. */ + + /* Values start out on the all_values chain. */ + val->reference_count = 1; + return val; } @@ -583,11 +594,29 @@ value_mark (void) return all_values; } +/* Take a reference to VAL. VAL will not be deallocated until all + references are released. */ + +void +value_incref (struct value *val) +{ + val->reference_count++; +} + +/* Release a reference to VAL, which was acquired with value_incref. + This function is also called to deallocate values from the value + chain. */ + void value_free (struct value *val) { if (val) { + gdb_assert (val->reference_count > 0); + val->reference_count--; + if (val->reference_count > 0) + return; + if (VALUE_LVAL (val) == lval_computed) { struct lval_funcs *funcs = val->location.computed.funcs; |