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authorJosé Valim <[email protected]>2016-07-16 22:24:50 +0200
committerJosé Valim <[email protected]>2016-08-04 13:22:14 +0200
commita5fcd4f26969a768950dc643eeed2fdb41a5dc41 (patch)
treec20bcd4a5dfeea6ccdc6a05ebd0eeaaeb0854a4d /lib/debugger/src/dbg_iload.erl
parentddfae156c2b21d5266bd6eb82bf9ca7c508226fd (diff)
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Move expansion of strings in binaries to v3_core
This speeds up the compilation of binary literals with string values in them. For example, compiling a file with a ~340kB binary would yield the following times by the compiler: Compiling "foo" parse_module : 0.130 s 5327.6 kB transform_module : 0.000 s 5327.6 kB lint_module : 0.011 s 5327.8 kB expand_module : 0.508 s 71881.2 kB v3_core : 0.463 s 11.5 kB Notice the increase in memory and processing time in expand_module and v3_core. This happened because expand_module would expand the string in binaries into chars. For example, the binary <<"foo">>, which is represented as {bin, 1, [ {bin_element, 1, {string, 1, "foo"}, default, default} ]} would be converted to {bin, 1, [ {bin_element, 1, {char, 1, $f}, default, default}, {bin_element, 1, {char, 1, $o}, default, default}, {bin_element, 1, {char, 1, $o}, default, default} ]} However, v3_core would then traverse all of those characters and convert it into an actual binary, as it is a literal value. This patch addresses this issue by moving the expansion of string into chars to v3_core and only if a literal value cannot not be built. This reduces the compilation time of the file mentioned above to the values below: Compiling "bar" parse_module : 0.134 s 5327.6 kB transform_module : 0.000 s 5327.6 kB lint_module : 0.005 s 5327.8 kB expand_module : 0.000 s 5328.7 kB v3_core : 0.013 s 11.2 kB
Diffstat (limited to 'lib/debugger/src/dbg_iload.erl')
-rw-r--r--lib/debugger/src/dbg_iload.erl19
1 files changed, 16 insertions, 3 deletions
diff --git a/lib/debugger/src/dbg_iload.erl b/lib/debugger/src/dbg_iload.erl
index 369b456524..f83684b605 100644
--- a/lib/debugger/src/dbg_iload.erl
+++ b/lib/debugger/src/dbg_iload.erl
@@ -216,7 +216,7 @@ pattern({op,_,'-',{float,Anno,I}}) ->
pattern({op,_,'+',{float,Anno,I}}) ->
{value,ln(Anno),I};
pattern({bin,Anno,Grp}) ->
- Grp1 = pattern_list(Grp),
+ Grp1 = pattern_list(bin_expand_strings(Grp)),
{bin,ln(Anno),Grp1};
pattern({bin_element,Anno,Expr,Size,Type}) ->
Expr1 = pattern(Expr),
@@ -297,7 +297,7 @@ gexpr({map,Anno,E0,Fs0}) ->
Fs1 = map_fields(Fs0, fun gexpr/1),
{map,ln(Anno),E1,Fs1};
gexpr({bin,Anno,Flds0}) ->
- Flds = gexpr_list(Flds0),
+ Flds = gexpr_list(bin_expand_strings(Flds0)),
{bin,ln(Anno),Flds};
gexpr({bin_element,Anno,Expr0,Size0,Type}) ->
Expr = gexpr(Expr0),
@@ -506,7 +506,7 @@ expr({op,Anno,Op,L0,R0}, _Lc) ->
R1 = expr(R0, false), %They see the same variables
{op,ln(Anno),Op,[L1,R1]};
expr({bin,Anno,Grp}, _Lc) ->
- Grp1 = expr_list(Grp),
+ Grp1 = expr_list(bin_expand_strings(Grp)),
{bin,ln(Anno),Grp1};
expr({bin_element,Anno,Expr,Size,Type}, _Lc) ->
Expr1 = expr(Expr, false),
@@ -519,6 +519,19 @@ consify([A|As]) ->
{cons,0,A,consify(As)};
consify([]) -> {value,0,[]}.
+%% The debugger converts both strings "abc" and lists [67, 68, 69]
+%% into {value, Line, [67, 68, 69]}, making it impossible to later
+%% distingish one or the other inside binaries when evaluating. To
+%% avoid <<[67, 68, 69]>> from evaluating, we convert strings into
+%% chars to avoid the ambiguity.
+bin_expand_strings(Es) ->
+ lists:foldr(fun ({bin_element,Line,{string,_,S},Sz,Ts}, Es1) ->
+ lists:foldr(fun (C, Es2) ->
+ [{bin_element,Line,{char,Line,C},Sz,Ts}|Es2]
+ end, Es1, S);
+ (E, Es1) -> [E|Es1]
+ end, [], Es).
+
%% -type expr_list([Expression]) -> [Expression].
%% These expressions are processed "in parallel" for purposes of variable
%% definition etc.